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Linux/net/core/pktgen.c

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  1 /*
  2  * Authors:
  3  * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
  4  *                             Uppsala University and
  5  *                             Swedish University of Agricultural Sciences
  6  *
  7  * Alexey Kuznetsov  <kuznet@ms2.inr.ac.ru>
  8  * Ben Greear <greearb@candelatech.com>
  9  * Jens Låås <jens.laas@data.slu.se>
 10  *
 11  * This program is free software; you can redistribute it and/or
 12  * modify it under the terms of the GNU General Public License
 13  * as published by the Free Software Foundation; either version
 14  * 2 of the License, or (at your option) any later version.
 15  *
 16  *
 17  * A tool for loading the network with preconfigurated packets.
 18  * The tool is implemented as a linux module.  Parameters are output
 19  * device, delay (to hard_xmit), number of packets, and whether
 20  * to use multiple SKBs or just the same one.
 21  * pktgen uses the installed interface's output routine.
 22  *
 23  * Additional hacking by:
 24  *
 25  * Jens.Laas@data.slu.se
 26  * Improved by ANK. 010120.
 27  * Improved by ANK even more. 010212.
 28  * MAC address typo fixed. 010417 --ro
 29  * Integrated.  020301 --DaveM
 30  * Added multiskb option 020301 --DaveM
 31  * Scaling of results. 020417--sigurdur@linpro.no
 32  * Significant re-work of the module:
 33  *   *  Convert to threaded model to more efficiently be able to transmit
 34  *       and receive on multiple interfaces at once.
 35  *   *  Converted many counters to __u64 to allow longer runs.
 36  *   *  Allow configuration of ranges, like min/max IP address, MACs,
 37  *       and UDP-ports, for both source and destination, and can
 38  *       set to use a random distribution or sequentially walk the range.
 39  *   *  Can now change most values after starting.
 40  *   *  Place 12-byte packet in UDP payload with magic number,
 41  *       sequence number, and timestamp.
 42  *   *  Add receiver code that detects dropped pkts, re-ordered pkts, and
 43  *       latencies (with micro-second) precision.
 44  *   *  Add IOCTL interface to easily get counters & configuration.
 45  *   --Ben Greear <greearb@candelatech.com>
 46  *
 47  * Renamed multiskb to clone_skb and cleaned up sending core for two distinct
 48  * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
 49  * as a "fastpath" with a configurable number of clones after alloc's.
 50  * clone_skb=0 means all packets are allocated this also means ranges time
 51  * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100
 52  * clones.
 53  *
 54  * Also moved to /proc/net/pktgen/
 55  * --ro
 56  *
 57  * Sept 10:  Fixed threading/locking.  Lots of bone-headed and more clever
 58  *    mistakes.  Also merged in DaveM's patch in the -pre6 patch.
 59  * --Ben Greear <greearb@candelatech.com>
 60  *
 61  * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
 62  *
 63  *
 64  * 021124 Finished major redesign and rewrite for new functionality.
 65  * See Documentation/networking/pktgen.txt for how to use this.
 66  *
 67  * The new operation:
 68  * For each CPU one thread/process is created at start. This process checks
 69  * for running devices in the if_list and sends packets until count is 0 it
 70  * also the thread checks the thread->control which is used for inter-process
 71  * communication. controlling process "posts" operations to the threads this
 72  * way.
 73  * The if_list is RCU protected, and the if_lock remains to protect updating
 74  * of if_list, from "add_device" as it invoked from userspace (via proc write).
 75  *
 76  * By design there should only be *one* "controlling" process. In practice
 77  * multiple write accesses gives unpredictable result. Understood by "write"
 78  * to /proc gives result code thats should be read be the "writer".
 79  * For practical use this should be no problem.
 80  *
 81  * Note when adding devices to a specific CPU there good idea to also assign
 82  * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
 83  * --ro
 84  *
 85  * Fix refcount off by one if first packet fails, potential null deref,
 86  * memleak 030710- KJP
 87  *
 88  * First "ranges" functionality for ipv6 030726 --ro
 89  *
 90  * Included flow support. 030802 ANK.
 91  *
 92  * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org>
 93  *
 94  * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
 95  * ia64 compilation fix from  Aron Griffis <aron@hp.com> 040604
 96  *
 97  * New xmit() return, do_div and misc clean up by Stephen Hemminger
 98  * <shemminger@osdl.org> 040923
 99  *
100  * Randy Dunlap fixed u64 printk compiler warning
101  *
102  * Remove FCS from BW calculation.  Lennert Buytenhek <buytenh@wantstofly.org>
103  * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
104  *
105  * Corrections from Nikolai Malykh (nmalykh@bilim.com)
106  * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
107  *
108  * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
109  * 050103
110  *
111  * MPLS support by Steven Whitehouse <steve@chygwyn.com>
112  *
113  * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com>
114  *
115  * Fixed src_mac command to set source mac of packet to value specified in
116  * command by Adit Ranadive <adit.262@gmail.com>
117  *
118  */
119 
120 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
121 
122 #include <linux/sys.h>
123 #include <linux/types.h>
124 #include <linux/module.h>
125 #include <linux/moduleparam.h>
126 #include <linux/kernel.h>
127 #include <linux/mutex.h>
128 #include <linux/sched.h>
129 #include <linux/slab.h>
130 #include <linux/vmalloc.h>
131 #include <linux/unistd.h>
132 #include <linux/string.h>
133 #include <linux/ptrace.h>
134 #include <linux/errno.h>
135 #include <linux/ioport.h>
136 #include <linux/interrupt.h>
137 #include <linux/capability.h>
138 #include <linux/hrtimer.h>
139 #include <linux/freezer.h>
140 #include <linux/delay.h>
141 #include <linux/timer.h>
142 #include <linux/list.h>
143 #include <linux/init.h>
144 #include <linux/skbuff.h>
145 #include <linux/netdevice.h>
146 #include <linux/inet.h>
147 #include <linux/inetdevice.h>
148 #include <linux/rtnetlink.h>
149 #include <linux/if_arp.h>
150 #include <linux/if_vlan.h>
151 #include <linux/in.h>
152 #include <linux/ip.h>
153 #include <linux/ipv6.h>
154 #include <linux/udp.h>
155 #include <linux/proc_fs.h>
156 #include <linux/seq_file.h>
157 #include <linux/wait.h>
158 #include <linux/etherdevice.h>
159 #include <linux/kthread.h>
160 #include <linux/prefetch.h>
161 #include <net/net_namespace.h>
162 #include <net/checksum.h>
163 #include <net/ipv6.h>
164 #include <net/udp.h>
165 #include <net/ip6_checksum.h>
166 #include <net/addrconf.h>
167 #ifdef CONFIG_XFRM
168 #include <net/xfrm.h>
169 #endif
170 #include <net/netns/generic.h>
171 #include <asm/byteorder.h>
172 #include <linux/rcupdate.h>
173 #include <linux/bitops.h>
174 #include <linux/io.h>
175 #include <linux/timex.h>
176 #include <linux/uaccess.h>
177 #include <asm/dma.h>
178 #include <asm/div64.h>          /* do_div */
179 
180 #define VERSION "2.75"
181 #define IP_NAME_SZ 32
182 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */
183 #define MPLS_STACK_BOTTOM htonl(0x00000100)
184 
185 #define func_enter() pr_debug("entering %s\n", __func__);
186 
187 /* Device flag bits */
188 #define F_IPSRC_RND   (1<<0)    /* IP-Src Random  */
189 #define F_IPDST_RND   (1<<1)    /* IP-Dst Random  */
190 #define F_UDPSRC_RND  (1<<2)    /* UDP-Src Random */
191 #define F_UDPDST_RND  (1<<3)    /* UDP-Dst Random */
192 #define F_MACSRC_RND  (1<<4)    /* MAC-Src Random */
193 #define F_MACDST_RND  (1<<5)    /* MAC-Dst Random */
194 #define F_TXSIZE_RND  (1<<6)    /* Transmit size is random */
195 #define F_IPV6        (1<<7)    /* Interface in IPV6 Mode */
196 #define F_MPLS_RND    (1<<8)    /* Random MPLS labels */
197 #define F_VID_RND     (1<<9)    /* Random VLAN ID */
198 #define F_SVID_RND    (1<<10)   /* Random SVLAN ID */
199 #define F_FLOW_SEQ    (1<<11)   /* Sequential flows */
200 #define F_IPSEC_ON    (1<<12)   /* ipsec on for flows */
201 #define F_QUEUE_MAP_RND (1<<13) /* queue map Random */
202 #define F_QUEUE_MAP_CPU (1<<14) /* queue map mirrors smp_processor_id() */
203 #define F_NODE          (1<<15) /* Node memory alloc*/
204 #define F_UDPCSUM       (1<<16) /* Include UDP checksum */
205 #define F_NO_TIMESTAMP  (1<<17) /* Don't timestamp packets (default TS) */
206 
207 /* Thread control flag bits */
208 #define T_STOP        (1<<0)    /* Stop run */
209 #define T_RUN         (1<<1)    /* Start run */
210 #define T_REMDEVALL   (1<<2)    /* Remove all devs */
211 #define T_REMDEV      (1<<3)    /* Remove one dev */
212 
213 /* Xmit modes */
214 #define M_START_XMIT            0       /* Default normal TX */
215 #define M_NETIF_RECEIVE         1       /* Inject packets into stack */
216 
217 /* If lock -- protects updating of if_list */
218 #define   if_lock(t)           spin_lock(&(t->if_lock));
219 #define   if_unlock(t)           spin_unlock(&(t->if_lock));
220 
221 /* Used to help with determining the pkts on receive */
222 #define PKTGEN_MAGIC 0xbe9be955
223 #define PG_PROC_DIR "pktgen"
224 #define PGCTRL      "pgctrl"
225 
226 #define MAX_CFLOWS  65536
227 
228 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4)
229 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4)
230 
231 struct flow_state {
232         __be32 cur_daddr;
233         int count;
234 #ifdef CONFIG_XFRM
235         struct xfrm_state *x;
236 #endif
237         __u32 flags;
238 };
239 
240 /* flow flag bits */
241 #define F_INIT   (1<<0)         /* flow has been initialized */
242 
243 struct pktgen_dev {
244         /*
245          * Try to keep frequent/infrequent used vars. separated.
246          */
247         struct proc_dir_entry *entry;   /* proc file */
248         struct pktgen_thread *pg_thread;/* the owner */
249         struct list_head list;          /* chaining in the thread's run-queue */
250         struct rcu_head  rcu;           /* freed by RCU */
251 
252         int running;            /* if false, the test will stop */
253 
254         /* If min != max, then we will either do a linear iteration, or
255          * we will do a random selection from within the range.
256          */
257         __u32 flags;
258         int xmit_mode;
259         int min_pkt_size;
260         int max_pkt_size;
261         int pkt_overhead;       /* overhead for MPLS, VLANs, IPSEC etc */
262         int nfrags;
263         int removal_mark;       /* non-zero => the device is marked for
264                                  * removal by worker thread */
265 
266         struct page *page;
267         u64 delay;              /* nano-seconds */
268 
269         __u64 count;            /* Default No packets to send */
270         __u64 sofar;            /* How many pkts we've sent so far */
271         __u64 tx_bytes;         /* How many bytes we've transmitted */
272         __u64 errors;           /* Errors when trying to transmit, */
273 
274         /* runtime counters relating to clone_skb */
275 
276         __u64 allocated_skbs;
277         __u32 clone_count;
278         int last_ok;            /* Was last skb sent?
279                                  * Or a failed transmit of some sort?
280                                  * This will keep sequence numbers in order
281                                  */
282         ktime_t next_tx;
283         ktime_t started_at;
284         ktime_t stopped_at;
285         u64     idle_acc;       /* nano-seconds */
286 
287         __u32 seq_num;
288 
289         int clone_skb;          /*
290                                  * Use multiple SKBs during packet gen.
291                                  * If this number is greater than 1, then
292                                  * that many copies of the same packet will be
293                                  * sent before a new packet is allocated.
294                                  * If you want to send 1024 identical packets
295                                  * before creating a new packet,
296                                  * set clone_skb to 1024.
297                                  */
298 
299         char dst_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
300         char dst_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
301         char src_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
302         char src_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
303 
304         struct in6_addr in6_saddr;
305         struct in6_addr in6_daddr;
306         struct in6_addr cur_in6_daddr;
307         struct in6_addr cur_in6_saddr;
308         /* For ranges */
309         struct in6_addr min_in6_daddr;
310         struct in6_addr max_in6_daddr;
311         struct in6_addr min_in6_saddr;
312         struct in6_addr max_in6_saddr;
313 
314         /* If we're doing ranges, random or incremental, then this
315          * defines the min/max for those ranges.
316          */
317         __be32 saddr_min;       /* inclusive, source IP address */
318         __be32 saddr_max;       /* exclusive, source IP address */
319         __be32 daddr_min;       /* inclusive, dest IP address */
320         __be32 daddr_max;       /* exclusive, dest IP address */
321 
322         __u16 udp_src_min;      /* inclusive, source UDP port */
323         __u16 udp_src_max;      /* exclusive, source UDP port */
324         __u16 udp_dst_min;      /* inclusive, dest UDP port */
325         __u16 udp_dst_max;      /* exclusive, dest UDP port */
326 
327         /* DSCP + ECN */
328         __u8 tos;            /* six MSB of (former) IPv4 TOS
329                                 are for dscp codepoint */
330         __u8 traffic_class;  /* ditto for the (former) Traffic Class in IPv6
331                                 (see RFC 3260, sec. 4) */
332 
333         /* MPLS */
334         unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */
335         __be32 labels[MAX_MPLS_LABELS];
336 
337         /* VLAN/SVLAN (802.1Q/Q-in-Q) */
338         __u8  vlan_p;
339         __u8  vlan_cfi;
340         __u16 vlan_id;  /* 0xffff means no vlan tag */
341 
342         __u8  svlan_p;
343         __u8  svlan_cfi;
344         __u16 svlan_id; /* 0xffff means no svlan tag */
345 
346         __u32 src_mac_count;    /* How many MACs to iterate through */
347         __u32 dst_mac_count;    /* How many MACs to iterate through */
348 
349         unsigned char dst_mac[ETH_ALEN];
350         unsigned char src_mac[ETH_ALEN];
351 
352         __u32 cur_dst_mac_offset;
353         __u32 cur_src_mac_offset;
354         __be32 cur_saddr;
355         __be32 cur_daddr;
356         __u16 ip_id;
357         __u16 cur_udp_dst;
358         __u16 cur_udp_src;
359         __u16 cur_queue_map;
360         __u32 cur_pkt_size;
361         __u32 last_pkt_size;
362 
363         __u8 hh[14];
364         /* = {
365            0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,
366 
367            We fill in SRC address later
368            0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
369            0x08, 0x00
370            };
371          */
372         __u16 pad;              /* pad out the hh struct to an even 16 bytes */
373 
374         struct sk_buff *skb;    /* skb we are to transmit next, used for when we
375                                  * are transmitting the same one multiple times
376                                  */
377         struct net_device *odev; /* The out-going device.
378                                   * Note that the device should have it's
379                                   * pg_info pointer pointing back to this
380                                   * device.
381                                   * Set when the user specifies the out-going
382                                   * device name (not when the inject is
383                                   * started as it used to do.)
384                                   */
385         char odevname[32];
386         struct flow_state *flows;
387         unsigned int cflows;    /* Concurrent flows (config) */
388         unsigned int lflow;             /* Flow length  (config) */
389         unsigned int nflows;    /* accumulated flows (stats) */
390         unsigned int curfl;             /* current sequenced flow (state)*/
391 
392         u16 queue_map_min;
393         u16 queue_map_max;
394         __u32 skb_priority;     /* skb priority field */
395         unsigned int burst;     /* number of duplicated packets to burst */
396         int node;               /* Memory node */
397 
398 #ifdef CONFIG_XFRM
399         __u8    ipsmode;                /* IPSEC mode (config) */
400         __u8    ipsproto;               /* IPSEC type (config) */
401         __u32   spi;
402         struct dst_entry dst;
403         struct dst_ops dstops;
404 #endif
405         char result[512];
406 };
407 
408 struct pktgen_hdr {
409         __be32 pgh_magic;
410         __be32 seq_num;
411         __be32 tv_sec;
412         __be32 tv_usec;
413 };
414 
415 
416 static int pg_net_id __read_mostly;
417 
418 struct pktgen_net {
419         struct net              *net;
420         struct proc_dir_entry   *proc_dir;
421         struct list_head        pktgen_threads;
422         bool                    pktgen_exiting;
423 };
424 
425 struct pktgen_thread {
426         spinlock_t if_lock;             /* for list of devices */
427         struct list_head if_list;       /* All device here */
428         struct list_head th_list;
429         struct task_struct *tsk;
430         char result[512];
431 
432         /* Field for thread to receive "posted" events terminate,
433            stop ifs etc. */
434 
435         u32 control;
436         int cpu;
437 
438         wait_queue_head_t queue;
439         struct completion start_done;
440         struct pktgen_net *net;
441 };
442 
443 #define REMOVE 1
444 #define FIND   0
445 
446 static const char version[] =
447         "Packet Generator for packet performance testing. "
448         "Version: " VERSION "\n";
449 
450 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
451 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
452 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
453                                           const char *ifname, bool exact);
454 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
455 static void pktgen_run_all_threads(struct pktgen_net *pn);
456 static void pktgen_reset_all_threads(struct pktgen_net *pn);
457 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn);
458 
459 static void pktgen_stop(struct pktgen_thread *t);
460 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);
461 
462 /* Module parameters, defaults. */
463 static int pg_count_d __read_mostly = 1000;
464 static int pg_delay_d __read_mostly;
465 static int pg_clone_skb_d  __read_mostly;
466 static int debug  __read_mostly;
467 
468 static DEFINE_MUTEX(pktgen_thread_lock);
469 
470 static struct notifier_block pktgen_notifier_block = {
471         .notifier_call = pktgen_device_event,
472 };
473 
474 /*
475  * /proc handling functions
476  *
477  */
478 
479 static int pgctrl_show(struct seq_file *seq, void *v)
480 {
481         seq_puts(seq, version);
482         return 0;
483 }
484 
485 static ssize_t pgctrl_write(struct file *file, const char __user *buf,
486                             size_t count, loff_t *ppos)
487 {
488         char data[128];
489         struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id);
490 
491         if (!capable(CAP_NET_ADMIN))
492                 return -EPERM;
493 
494         if (count == 0)
495                 return -EINVAL;
496 
497         if (count > sizeof(data))
498                 count = sizeof(data);
499 
500         if (copy_from_user(data, buf, count))
501                 return -EFAULT;
502 
503         data[count - 1] = 0;    /* Strip trailing '\n' and terminate string */
504 
505         if (!strcmp(data, "stop"))
506                 pktgen_stop_all_threads_ifs(pn);
507 
508         else if (!strcmp(data, "start"))
509                 pktgen_run_all_threads(pn);
510 
511         else if (!strcmp(data, "reset"))
512                 pktgen_reset_all_threads(pn);
513 
514         else
515                 return -EINVAL;
516 
517         return count;
518 }
519 
520 static int pgctrl_open(struct inode *inode, struct file *file)
521 {
522         return single_open(file, pgctrl_show, PDE_DATA(inode));
523 }
524 
525 static const struct file_operations pktgen_fops = {
526         .owner   = THIS_MODULE,
527         .open    = pgctrl_open,
528         .read    = seq_read,
529         .llseek  = seq_lseek,
530         .write   = pgctrl_write,
531         .release = single_release,
532 };
533 
534 static int pktgen_if_show(struct seq_file *seq, void *v)
535 {
536         const struct pktgen_dev *pkt_dev = seq->private;
537         ktime_t stopped;
538         u64 idle;
539 
540         seq_printf(seq,
541                    "Params: count %llu  min_pkt_size: %u  max_pkt_size: %u\n",
542                    (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size,
543                    pkt_dev->max_pkt_size);
544 
545         seq_printf(seq,
546                    "     frags: %d  delay: %llu  clone_skb: %d  ifname: %s\n",
547                    pkt_dev->nfrags, (unsigned long long) pkt_dev->delay,
548                    pkt_dev->clone_skb, pkt_dev->odevname);
549 
550         seq_printf(seq, "     flows: %u flowlen: %u\n", pkt_dev->cflows,
551                    pkt_dev->lflow);
552 
553         seq_printf(seq,
554                    "     queue_map_min: %u  queue_map_max: %u\n",
555                    pkt_dev->queue_map_min,
556                    pkt_dev->queue_map_max);
557 
558         if (pkt_dev->skb_priority)
559                 seq_printf(seq, "     skb_priority: %u\n",
560                            pkt_dev->skb_priority);
561 
562         if (pkt_dev->flags & F_IPV6) {
563                 seq_printf(seq,
564                            "     saddr: %pI6c  min_saddr: %pI6c  max_saddr: %pI6c\n"
565                            "     daddr: %pI6c  min_daddr: %pI6c  max_daddr: %pI6c\n",
566                            &pkt_dev->in6_saddr,
567                            &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr,
568                            &pkt_dev->in6_daddr,
569                            &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr);
570         } else {
571                 seq_printf(seq,
572                            "     dst_min: %s  dst_max: %s\n",
573                            pkt_dev->dst_min, pkt_dev->dst_max);
574                 seq_printf(seq,
575                            "     src_min: %s  src_max: %s\n",
576                            pkt_dev->src_min, pkt_dev->src_max);
577         }
578 
579         seq_puts(seq, "     src_mac: ");
580 
581         seq_printf(seq, "%pM ",
582                    is_zero_ether_addr(pkt_dev->src_mac) ?
583                              pkt_dev->odev->dev_addr : pkt_dev->src_mac);
584 
585         seq_puts(seq, "dst_mac: ");
586         seq_printf(seq, "%pM\n", pkt_dev->dst_mac);
587 
588         seq_printf(seq,
589                    "     udp_src_min: %d  udp_src_max: %d"
590                    "  udp_dst_min: %d  udp_dst_max: %d\n",
591                    pkt_dev->udp_src_min, pkt_dev->udp_src_max,
592                    pkt_dev->udp_dst_min, pkt_dev->udp_dst_max);
593 
594         seq_printf(seq,
595                    "     src_mac_count: %d  dst_mac_count: %d\n",
596                    pkt_dev->src_mac_count, pkt_dev->dst_mac_count);
597 
598         if (pkt_dev->nr_labels) {
599                 unsigned int i;
600                 seq_puts(seq, "     mpls: ");
601                 for (i = 0; i < pkt_dev->nr_labels; i++)
602                         seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]),
603                                    i == pkt_dev->nr_labels-1 ? "\n" : ", ");
604         }
605 
606         if (pkt_dev->vlan_id != 0xffff)
607                 seq_printf(seq, "     vlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
608                            pkt_dev->vlan_id, pkt_dev->vlan_p,
609                            pkt_dev->vlan_cfi);
610 
611         if (pkt_dev->svlan_id != 0xffff)
612                 seq_printf(seq, "     svlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
613                            pkt_dev->svlan_id, pkt_dev->svlan_p,
614                            pkt_dev->svlan_cfi);
615 
616         if (pkt_dev->tos)
617                 seq_printf(seq, "     tos: 0x%02x\n", pkt_dev->tos);
618 
619         if (pkt_dev->traffic_class)
620                 seq_printf(seq, "     traffic_class: 0x%02x\n", pkt_dev->traffic_class);
621 
622         if (pkt_dev->burst > 1)
623                 seq_printf(seq, "     burst: %d\n", pkt_dev->burst);
624 
625         if (pkt_dev->node >= 0)
626                 seq_printf(seq, "     node: %d\n", pkt_dev->node);
627 
628         if (pkt_dev->xmit_mode == M_NETIF_RECEIVE)
629                 seq_puts(seq, "     xmit_mode: netif_receive\n");
630 
631         seq_puts(seq, "     Flags: ");
632 
633         if (pkt_dev->flags & F_IPV6)
634                 seq_puts(seq, "IPV6  ");
635 
636         if (pkt_dev->flags & F_IPSRC_RND)
637                 seq_puts(seq, "IPSRC_RND  ");
638 
639         if (pkt_dev->flags & F_IPDST_RND)
640                 seq_puts(seq, "IPDST_RND  ");
641 
642         if (pkt_dev->flags & F_TXSIZE_RND)
643                 seq_puts(seq, "TXSIZE_RND  ");
644 
645         if (pkt_dev->flags & F_UDPSRC_RND)
646                 seq_puts(seq, "UDPSRC_RND  ");
647 
648         if (pkt_dev->flags & F_UDPDST_RND)
649                 seq_puts(seq, "UDPDST_RND  ");
650 
651         if (pkt_dev->flags & F_UDPCSUM)
652                 seq_puts(seq, "UDPCSUM  ");
653 
654         if (pkt_dev->flags & F_NO_TIMESTAMP)
655                 seq_puts(seq, "NO_TIMESTAMP  ");
656 
657         if (pkt_dev->flags & F_MPLS_RND)
658                 seq_puts(seq,  "MPLS_RND  ");
659 
660         if (pkt_dev->flags & F_QUEUE_MAP_RND)
661                 seq_puts(seq,  "QUEUE_MAP_RND  ");
662 
663         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
664                 seq_puts(seq,  "QUEUE_MAP_CPU  ");
665 
666         if (pkt_dev->cflows) {
667                 if (pkt_dev->flags & F_FLOW_SEQ)
668                         seq_puts(seq,  "FLOW_SEQ  "); /*in sequence flows*/
669                 else
670                         seq_puts(seq,  "FLOW_RND  ");
671         }
672 
673 #ifdef CONFIG_XFRM
674         if (pkt_dev->flags & F_IPSEC_ON) {
675                 seq_puts(seq,  "IPSEC  ");
676                 if (pkt_dev->spi)
677                         seq_printf(seq, "spi:%u", pkt_dev->spi);
678         }
679 #endif
680 
681         if (pkt_dev->flags & F_MACSRC_RND)
682                 seq_puts(seq, "MACSRC_RND  ");
683 
684         if (pkt_dev->flags & F_MACDST_RND)
685                 seq_puts(seq, "MACDST_RND  ");
686 
687         if (pkt_dev->flags & F_VID_RND)
688                 seq_puts(seq, "VID_RND  ");
689 
690         if (pkt_dev->flags & F_SVID_RND)
691                 seq_puts(seq, "SVID_RND  ");
692 
693         if (pkt_dev->flags & F_NODE)
694                 seq_puts(seq, "NODE_ALLOC  ");
695 
696         seq_puts(seq, "\n");
697 
698         /* not really stopped, more like last-running-at */
699         stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at;
700         idle = pkt_dev->idle_acc;
701         do_div(idle, NSEC_PER_USEC);
702 
703         seq_printf(seq,
704                    "Current:\n     pkts-sofar: %llu  errors: %llu\n",
705                    (unsigned long long)pkt_dev->sofar,
706                    (unsigned long long)pkt_dev->errors);
707 
708         seq_printf(seq,
709                    "     started: %lluus  stopped: %lluus idle: %lluus\n",
710                    (unsigned long long) ktime_to_us(pkt_dev->started_at),
711                    (unsigned long long) ktime_to_us(stopped),
712                    (unsigned long long) idle);
713 
714         seq_printf(seq,
715                    "     seq_num: %d  cur_dst_mac_offset: %d  cur_src_mac_offset: %d\n",
716                    pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset,
717                    pkt_dev->cur_src_mac_offset);
718 
719         if (pkt_dev->flags & F_IPV6) {
720                 seq_printf(seq, "     cur_saddr: %pI6c  cur_daddr: %pI6c\n",
721                                 &pkt_dev->cur_in6_saddr,
722                                 &pkt_dev->cur_in6_daddr);
723         } else
724                 seq_printf(seq, "     cur_saddr: %pI4  cur_daddr: %pI4\n",
725                            &pkt_dev->cur_saddr, &pkt_dev->cur_daddr);
726 
727         seq_printf(seq, "     cur_udp_dst: %d  cur_udp_src: %d\n",
728                    pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);
729 
730         seq_printf(seq, "     cur_queue_map: %u\n", pkt_dev->cur_queue_map);
731 
732         seq_printf(seq, "     flows: %u\n", pkt_dev->nflows);
733 
734         if (pkt_dev->result[0])
735                 seq_printf(seq, "Result: %s\n", pkt_dev->result);
736         else
737                 seq_puts(seq, "Result: Idle\n");
738 
739         return 0;
740 }
741 
742 
743 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
744                      __u32 *num)
745 {
746         int i = 0;
747         *num = 0;
748 
749         for (; i < maxlen; i++) {
750                 int value;
751                 char c;
752                 *num <<= 4;
753                 if (get_user(c, &user_buffer[i]))
754                         return -EFAULT;
755                 value = hex_to_bin(c);
756                 if (value >= 0)
757                         *num |= value;
758                 else
759                         break;
760         }
761         return i;
762 }
763 
764 static int count_trail_chars(const char __user * user_buffer,
765                              unsigned int maxlen)
766 {
767         int i;
768 
769         for (i = 0; i < maxlen; i++) {
770                 char c;
771                 if (get_user(c, &user_buffer[i]))
772                         return -EFAULT;
773                 switch (c) {
774                 case '\"':
775                 case '\n':
776                 case '\r':
777                 case '\t':
778                 case ' ':
779                 case '=':
780                         break;
781                 default:
782                         goto done;
783                 }
784         }
785 done:
786         return i;
787 }
788 
789 static long num_arg(const char __user *user_buffer, unsigned long maxlen,
790                                 unsigned long *num)
791 {
792         int i;
793         *num = 0;
794 
795         for (i = 0; i < maxlen; i++) {
796                 char c;
797                 if (get_user(c, &user_buffer[i]))
798                         return -EFAULT;
799                 if ((c >= '') && (c <= '9')) {
800                         *num *= 10;
801                         *num += c - '';
802                 } else
803                         break;
804         }
805         return i;
806 }
807 
808 static int strn_len(const char __user * user_buffer, unsigned int maxlen)
809 {
810         int i;
811 
812         for (i = 0; i < maxlen; i++) {
813                 char c;
814                 if (get_user(c, &user_buffer[i]))
815                         return -EFAULT;
816                 switch (c) {
817                 case '\"':
818                 case '\n':
819                 case '\r':
820                 case '\t':
821                 case ' ':
822                         goto done_str;
823                 default:
824                         break;
825                 }
826         }
827 done_str:
828         return i;
829 }
830 
831 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
832 {
833         unsigned int n = 0;
834         char c;
835         ssize_t i = 0;
836         int len;
837 
838         pkt_dev->nr_labels = 0;
839         do {
840                 __u32 tmp;
841                 len = hex32_arg(&buffer[i], 8, &tmp);
842                 if (len <= 0)
843                         return len;
844                 pkt_dev->labels[n] = htonl(tmp);
845                 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
846                         pkt_dev->flags |= F_MPLS_RND;
847                 i += len;
848                 if (get_user(c, &buffer[i]))
849                         return -EFAULT;
850                 i++;
851                 n++;
852                 if (n >= MAX_MPLS_LABELS)
853                         return -E2BIG;
854         } while (c == ',');
855 
856         pkt_dev->nr_labels = n;
857         return i;
858 }
859 
860 static ssize_t pktgen_if_write(struct file *file,
861                                const char __user * user_buffer, size_t count,
862                                loff_t * offset)
863 {
864         struct seq_file *seq = file->private_data;
865         struct pktgen_dev *pkt_dev = seq->private;
866         int i, max, len;
867         char name[16], valstr[32];
868         unsigned long value = 0;
869         char *pg_result = NULL;
870         int tmp = 0;
871         char buf[128];
872 
873         pg_result = &(pkt_dev->result[0]);
874 
875         if (count < 1) {
876                 pr_warn("wrong command format\n");
877                 return -EINVAL;
878         }
879 
880         max = count;
881         tmp = count_trail_chars(user_buffer, max);
882         if (tmp < 0) {
883                 pr_warn("illegal format\n");
884                 return tmp;
885         }
886         i = tmp;
887 
888         /* Read variable name */
889 
890         len = strn_len(&user_buffer[i], sizeof(name) - 1);
891         if (len < 0)
892                 return len;
893 
894         memset(name, 0, sizeof(name));
895         if (copy_from_user(name, &user_buffer[i], len))
896                 return -EFAULT;
897         i += len;
898 
899         max = count - i;
900         len = count_trail_chars(&user_buffer[i], max);
901         if (len < 0)
902                 return len;
903 
904         i += len;
905 
906         if (debug) {
907                 size_t copy = min_t(size_t, count, 1023);
908                 char tb[copy + 1];
909                 if (copy_from_user(tb, user_buffer, copy))
910                         return -EFAULT;
911                 tb[copy] = 0;
912                 pr_debug("%s,%lu  buffer -:%s:-\n",
913                          name, (unsigned long)count, tb);
914         }
915 
916         if (!strcmp(name, "min_pkt_size")) {
917                 len = num_arg(&user_buffer[i], 10, &value);
918                 if (len < 0)
919                         return len;
920 
921                 i += len;
922                 if (value < 14 + 20 + 8)
923                         value = 14 + 20 + 8;
924                 if (value != pkt_dev->min_pkt_size) {
925                         pkt_dev->min_pkt_size = value;
926                         pkt_dev->cur_pkt_size = value;
927                 }
928                 sprintf(pg_result, "OK: min_pkt_size=%u",
929                         pkt_dev->min_pkt_size);
930                 return count;
931         }
932 
933         if (!strcmp(name, "max_pkt_size")) {
934                 len = num_arg(&user_buffer[i], 10, &value);
935                 if (len < 0)
936                         return len;
937 
938                 i += len;
939                 if (value < 14 + 20 + 8)
940                         value = 14 + 20 + 8;
941                 if (value != pkt_dev->max_pkt_size) {
942                         pkt_dev->max_pkt_size = value;
943                         pkt_dev->cur_pkt_size = value;
944                 }
945                 sprintf(pg_result, "OK: max_pkt_size=%u",
946                         pkt_dev->max_pkt_size);
947                 return count;
948         }
949 
950         /* Shortcut for min = max */
951 
952         if (!strcmp(name, "pkt_size")) {
953                 len = num_arg(&user_buffer[i], 10, &value);
954                 if (len < 0)
955                         return len;
956 
957                 i += len;
958                 if (value < 14 + 20 + 8)
959                         value = 14 + 20 + 8;
960                 if (value != pkt_dev->min_pkt_size) {
961                         pkt_dev->min_pkt_size = value;
962                         pkt_dev->max_pkt_size = value;
963                         pkt_dev->cur_pkt_size = value;
964                 }
965                 sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
966                 return count;
967         }
968 
969         if (!strcmp(name, "debug")) {
970                 len = num_arg(&user_buffer[i], 10, &value);
971                 if (len < 0)
972                         return len;
973 
974                 i += len;
975                 debug = value;
976                 sprintf(pg_result, "OK: debug=%u", debug);
977                 return count;
978         }
979 
980         if (!strcmp(name, "frags")) {
981                 len = num_arg(&user_buffer[i], 10, &value);
982                 if (len < 0)
983                         return len;
984 
985                 i += len;
986                 pkt_dev->nfrags = value;
987                 sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
988                 return count;
989         }
990         if (!strcmp(name, "delay")) {
991                 len = num_arg(&user_buffer[i], 10, &value);
992                 if (len < 0)
993                         return len;
994 
995                 i += len;
996                 if (value == 0x7FFFFFFF)
997                         pkt_dev->delay = ULLONG_MAX;
998                 else
999                         pkt_dev->delay = (u64)value;
1000 
1001                 sprintf(pg_result, "OK: delay=%llu",
1002                         (unsigned long long) pkt_dev->delay);
1003                 return count;
1004         }
1005         if (!strcmp(name, "rate")) {
1006                 len = num_arg(&user_buffer[i], 10, &value);
1007                 if (len < 0)
1008                         return len;
1009 
1010                 i += len;
1011                 if (!value)
1012                         return len;
1013                 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
1014                 if (debug)
1015                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1016 
1017                 sprintf(pg_result, "OK: rate=%lu", value);
1018                 return count;
1019         }
1020         if (!strcmp(name, "ratep")) {
1021                 len = num_arg(&user_buffer[i], 10, &value);
1022                 if (len < 0)
1023                         return len;
1024 
1025                 i += len;
1026                 if (!value)
1027                         return len;
1028                 pkt_dev->delay = NSEC_PER_SEC/value;
1029                 if (debug)
1030                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1031 
1032                 sprintf(pg_result, "OK: rate=%lu", value);
1033                 return count;
1034         }
1035         if (!strcmp(name, "udp_src_min")) {
1036                 len = num_arg(&user_buffer[i], 10, &value);
1037                 if (len < 0)
1038                         return len;
1039 
1040                 i += len;
1041                 if (value != pkt_dev->udp_src_min) {
1042                         pkt_dev->udp_src_min = value;
1043                         pkt_dev->cur_udp_src = value;
1044                 }
1045                 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
1046                 return count;
1047         }
1048         if (!strcmp(name, "udp_dst_min")) {
1049                 len = num_arg(&user_buffer[i], 10, &value);
1050                 if (len < 0)
1051                         return len;
1052 
1053                 i += len;
1054                 if (value != pkt_dev->udp_dst_min) {
1055                         pkt_dev->udp_dst_min = value;
1056                         pkt_dev->cur_udp_dst = value;
1057                 }
1058                 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
1059                 return count;
1060         }
1061         if (!strcmp(name, "udp_src_max")) {
1062                 len = num_arg(&user_buffer[i], 10, &value);
1063                 if (len < 0)
1064                         return len;
1065 
1066                 i += len;
1067                 if (value != pkt_dev->udp_src_max) {
1068                         pkt_dev->udp_src_max = value;
1069                         pkt_dev->cur_udp_src = value;
1070                 }
1071                 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
1072                 return count;
1073         }
1074         if (!strcmp(name, "udp_dst_max")) {
1075                 len = num_arg(&user_buffer[i], 10, &value);
1076                 if (len < 0)
1077                         return len;
1078 
1079                 i += len;
1080                 if (value != pkt_dev->udp_dst_max) {
1081                         pkt_dev->udp_dst_max = value;
1082                         pkt_dev->cur_udp_dst = value;
1083                 }
1084                 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
1085                 return count;
1086         }
1087         if (!strcmp(name, "clone_skb")) {
1088                 len = num_arg(&user_buffer[i], 10, &value);
1089                 if (len < 0)
1090                         return len;
1091                 if ((value > 0) &&
1092                     ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) ||
1093                      !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1094                         return -ENOTSUPP;
1095                 i += len;
1096                 pkt_dev->clone_skb = value;
1097 
1098                 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
1099                 return count;
1100         }
1101         if (!strcmp(name, "count")) {
1102                 len = num_arg(&user_buffer[i], 10, &value);
1103                 if (len < 0)
1104                         return len;
1105 
1106                 i += len;
1107                 pkt_dev->count = value;
1108                 sprintf(pg_result, "OK: count=%llu",
1109                         (unsigned long long)pkt_dev->count);
1110                 return count;
1111         }
1112         if (!strcmp(name, "src_mac_count")) {
1113                 len = num_arg(&user_buffer[i], 10, &value);
1114                 if (len < 0)
1115                         return len;
1116 
1117                 i += len;
1118                 if (pkt_dev->src_mac_count != value) {
1119                         pkt_dev->src_mac_count = value;
1120                         pkt_dev->cur_src_mac_offset = 0;
1121                 }
1122                 sprintf(pg_result, "OK: src_mac_count=%d",
1123                         pkt_dev->src_mac_count);
1124                 return count;
1125         }
1126         if (!strcmp(name, "dst_mac_count")) {
1127                 len = num_arg(&user_buffer[i], 10, &value);
1128                 if (len < 0)
1129                         return len;
1130 
1131                 i += len;
1132                 if (pkt_dev->dst_mac_count != value) {
1133                         pkt_dev->dst_mac_count = value;
1134                         pkt_dev->cur_dst_mac_offset = 0;
1135                 }
1136                 sprintf(pg_result, "OK: dst_mac_count=%d",
1137                         pkt_dev->dst_mac_count);
1138                 return count;
1139         }
1140         if (!strcmp(name, "burst")) {
1141                 len = num_arg(&user_buffer[i], 10, &value);
1142                 if (len < 0)
1143                         return len;
1144 
1145                 i += len;
1146                 if ((value > 1) && (pkt_dev->xmit_mode == M_START_XMIT) &&
1147                     (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1148                         return -ENOTSUPP;
1149                 pkt_dev->burst = value < 1 ? 1 : value;
1150                 sprintf(pg_result, "OK: burst=%d", pkt_dev->burst);
1151                 return count;
1152         }
1153         if (!strcmp(name, "node")) {
1154                 len = num_arg(&user_buffer[i], 10, &value);
1155                 if (len < 0)
1156                         return len;
1157 
1158                 i += len;
1159 
1160                 if (node_possible(value)) {
1161                         pkt_dev->node = value;
1162                         sprintf(pg_result, "OK: node=%d", pkt_dev->node);
1163                         if (pkt_dev->page) {
1164                                 put_page(pkt_dev->page);
1165                                 pkt_dev->page = NULL;
1166                         }
1167                 }
1168                 else
1169                         sprintf(pg_result, "ERROR: node not possible");
1170                 return count;
1171         }
1172         if (!strcmp(name, "xmit_mode")) {
1173                 char f[32];
1174 
1175                 memset(f, 0, 32);
1176                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1177                 if (len < 0)
1178                         return len;
1179 
1180                 if (copy_from_user(f, &user_buffer[i], len))
1181                         return -EFAULT;
1182                 i += len;
1183 
1184                 if (strcmp(f, "start_xmit") == 0) {
1185                         pkt_dev->xmit_mode = M_START_XMIT;
1186                 } else if (strcmp(f, "netif_receive") == 0) {
1187                         /* clone_skb set earlier, not supported in this mode */
1188                         if (pkt_dev->clone_skb > 0)
1189                                 return -ENOTSUPP;
1190 
1191                         pkt_dev->xmit_mode = M_NETIF_RECEIVE;
1192 
1193                         /* make sure new packet is allocated every time
1194                          * pktgen_xmit() is called
1195                          */
1196                         pkt_dev->last_ok = 1;
1197 
1198                         /* override clone_skb if user passed default value
1199                          * at module loading time
1200                          */
1201                         pkt_dev->clone_skb = 0;
1202                 } else {
1203                         sprintf(pg_result,
1204                                 "xmit_mode -:%s:- unknown\nAvailable modes: %s",
1205                                 f, "start_xmit, netif_receive\n");
1206                         return count;
1207                 }
1208                 sprintf(pg_result, "OK: xmit_mode=%s", f);
1209                 return count;
1210         }
1211         if (!strcmp(name, "flag")) {
1212                 char f[32];
1213                 memset(f, 0, 32);
1214                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1215                 if (len < 0)
1216                         return len;
1217 
1218                 if (copy_from_user(f, &user_buffer[i], len))
1219                         return -EFAULT;
1220                 i += len;
1221                 if (strcmp(f, "IPSRC_RND") == 0)
1222                         pkt_dev->flags |= F_IPSRC_RND;
1223 
1224                 else if (strcmp(f, "!IPSRC_RND") == 0)
1225                         pkt_dev->flags &= ~F_IPSRC_RND;
1226 
1227                 else if (strcmp(f, "TXSIZE_RND") == 0)
1228                         pkt_dev->flags |= F_TXSIZE_RND;
1229 
1230                 else if (strcmp(f, "!TXSIZE_RND") == 0)
1231                         pkt_dev->flags &= ~F_TXSIZE_RND;
1232 
1233                 else if (strcmp(f, "IPDST_RND") == 0)
1234                         pkt_dev->flags |= F_IPDST_RND;
1235 
1236                 else if (strcmp(f, "!IPDST_RND") == 0)
1237                         pkt_dev->flags &= ~F_IPDST_RND;
1238 
1239                 else if (strcmp(f, "UDPSRC_RND") == 0)
1240                         pkt_dev->flags |= F_UDPSRC_RND;
1241 
1242                 else if (strcmp(f, "!UDPSRC_RND") == 0)
1243                         pkt_dev->flags &= ~F_UDPSRC_RND;
1244 
1245                 else if (strcmp(f, "UDPDST_RND") == 0)
1246                         pkt_dev->flags |= F_UDPDST_RND;
1247 
1248                 else if (strcmp(f, "!UDPDST_RND") == 0)
1249                         pkt_dev->flags &= ~F_UDPDST_RND;
1250 
1251                 else if (strcmp(f, "MACSRC_RND") == 0)
1252                         pkt_dev->flags |= F_MACSRC_RND;
1253 
1254                 else if (strcmp(f, "!MACSRC_RND") == 0)
1255                         pkt_dev->flags &= ~F_MACSRC_RND;
1256 
1257                 else if (strcmp(f, "MACDST_RND") == 0)
1258                         pkt_dev->flags |= F_MACDST_RND;
1259 
1260                 else if (strcmp(f, "!MACDST_RND") == 0)
1261                         pkt_dev->flags &= ~F_MACDST_RND;
1262 
1263                 else if (strcmp(f, "MPLS_RND") == 0)
1264                         pkt_dev->flags |= F_MPLS_RND;
1265 
1266                 else if (strcmp(f, "!MPLS_RND") == 0)
1267                         pkt_dev->flags &= ~F_MPLS_RND;
1268 
1269                 else if (strcmp(f, "VID_RND") == 0)
1270                         pkt_dev->flags |= F_VID_RND;
1271 
1272                 else if (strcmp(f, "!VID_RND") == 0)
1273                         pkt_dev->flags &= ~F_VID_RND;
1274 
1275                 else if (strcmp(f, "SVID_RND") == 0)
1276                         pkt_dev->flags |= F_SVID_RND;
1277 
1278                 else if (strcmp(f, "!SVID_RND") == 0)
1279                         pkt_dev->flags &= ~F_SVID_RND;
1280 
1281                 else if (strcmp(f, "FLOW_SEQ") == 0)
1282                         pkt_dev->flags |= F_FLOW_SEQ;
1283 
1284                 else if (strcmp(f, "QUEUE_MAP_RND") == 0)
1285                         pkt_dev->flags |= F_QUEUE_MAP_RND;
1286 
1287                 else if (strcmp(f, "!QUEUE_MAP_RND") == 0)
1288                         pkt_dev->flags &= ~F_QUEUE_MAP_RND;
1289 
1290                 else if (strcmp(f, "QUEUE_MAP_CPU") == 0)
1291                         pkt_dev->flags |= F_QUEUE_MAP_CPU;
1292 
1293                 else if (strcmp(f, "!QUEUE_MAP_CPU") == 0)
1294                         pkt_dev->flags &= ~F_QUEUE_MAP_CPU;
1295 #ifdef CONFIG_XFRM
1296                 else if (strcmp(f, "IPSEC") == 0)
1297                         pkt_dev->flags |= F_IPSEC_ON;
1298 #endif
1299 
1300                 else if (strcmp(f, "!IPV6") == 0)
1301                         pkt_dev->flags &= ~F_IPV6;
1302 
1303                 else if (strcmp(f, "NODE_ALLOC") == 0)
1304                         pkt_dev->flags |= F_NODE;
1305 
1306                 else if (strcmp(f, "!NODE_ALLOC") == 0)
1307                         pkt_dev->flags &= ~F_NODE;
1308 
1309                 else if (strcmp(f, "UDPCSUM") == 0)
1310                         pkt_dev->flags |= F_UDPCSUM;
1311 
1312                 else if (strcmp(f, "!UDPCSUM") == 0)
1313                         pkt_dev->flags &= ~F_UDPCSUM;
1314 
1315                 else if (strcmp(f, "NO_TIMESTAMP") == 0)
1316                         pkt_dev->flags |= F_NO_TIMESTAMP;
1317 
1318                 else if (strcmp(f, "!NO_TIMESTAMP") == 0)
1319                         pkt_dev->flags &= ~F_NO_TIMESTAMP;
1320 
1321                 else {
1322                         sprintf(pg_result,
1323                                 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
1324                                 f,
1325                                 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
1326                                 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, "
1327                                 "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, "
1328                                 "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
1329                                 "NO_TIMESTAMP, "
1330 #ifdef CONFIG_XFRM
1331                                 "IPSEC, "
1332 #endif
1333                                 "NODE_ALLOC\n");
1334                         return count;
1335                 }
1336                 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
1337                 return count;
1338         }
1339         if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
1340                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
1341                 if (len < 0)
1342                         return len;
1343 
1344                 if (copy_from_user(buf, &user_buffer[i], len))
1345                         return -EFAULT;
1346                 buf[len] = 0;
1347                 if (strcmp(buf, pkt_dev->dst_min) != 0) {
1348                         memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
1349                         strncpy(pkt_dev->dst_min, buf, len);
1350                         pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
1351                         pkt_dev->cur_daddr = pkt_dev->daddr_min;
1352                 }
1353                 if (debug)
1354                         pr_debug("dst_min set to: %s\n", pkt_dev->dst_min);
1355                 i += len;
1356                 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
1357                 return count;
1358         }
1359         if (!strcmp(name, "dst_max")) {
1360                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
1361                 if (len < 0)
1362                         return len;
1363 
1364 
1365                 if (copy_from_user(buf, &user_buffer[i], len))
1366                         return -EFAULT;
1367 
1368                 buf[len] = 0;
1369                 if (strcmp(buf, pkt_dev->dst_max) != 0) {
1370                         memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
1371                         strncpy(pkt_dev->dst_max, buf, len);
1372                         pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
1373                         pkt_dev->cur_daddr = pkt_dev->daddr_max;
1374                 }
1375                 if (debug)
1376                         pr_debug("dst_max set to: %s\n", pkt_dev->dst_max);
1377                 i += len;
1378                 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
1379                 return count;
1380         }
1381         if (!strcmp(name, "dst6")) {
1382                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1383                 if (len < 0)
1384                         return len;
1385 
1386                 pkt_dev->flags |= F_IPV6;
1387 
1388                 if (copy_from_user(buf, &user_buffer[i], len))
1389                         return -EFAULT;
1390                 buf[len] = 0;
1391 
1392                 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL);
1393                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr);
1394 
1395                 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr;
1396 
1397                 if (debug)
1398                         pr_debug("dst6 set to: %s\n", buf);
1399 
1400                 i += len;
1401                 sprintf(pg_result, "OK: dst6=%s", buf);
1402                 return count;
1403         }
1404         if (!strcmp(name, "dst6_min")) {
1405                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1406                 if (len < 0)
1407                         return len;
1408 
1409                 pkt_dev->flags |= F_IPV6;
1410 
1411                 if (copy_from_user(buf, &user_buffer[i], len))
1412                         return -EFAULT;
1413                 buf[len] = 0;
1414 
1415                 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL);
1416                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr);
1417 
1418                 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr;
1419                 if (debug)
1420                         pr_debug("dst6_min set to: %s\n", buf);
1421 
1422                 i += len;
1423                 sprintf(pg_result, "OK: dst6_min=%s", buf);
1424                 return count;
1425         }
1426         if (!strcmp(name, "dst6_max")) {
1427                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1428                 if (len < 0)
1429                         return len;
1430 
1431                 pkt_dev->flags |= F_IPV6;
1432 
1433                 if (copy_from_user(buf, &user_buffer[i], len))
1434                         return -EFAULT;
1435                 buf[len] = 0;
1436 
1437                 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL);
1438                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr);
1439 
1440                 if (debug)
1441                         pr_debug("dst6_max set to: %s\n", buf);
1442 
1443                 i += len;
1444                 sprintf(pg_result, "OK: dst6_max=%s", buf);
1445                 return count;
1446         }
1447         if (!strcmp(name, "src6")) {
1448                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1449                 if (len < 0)
1450                         return len;
1451 
1452                 pkt_dev->flags |= F_IPV6;
1453 
1454                 if (copy_from_user(buf, &user_buffer[i], len))
1455                         return -EFAULT;
1456                 buf[len] = 0;
1457 
1458                 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL);
1459                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr);
1460 
1461                 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr;
1462 
1463                 if (debug)
1464                         pr_debug("src6 set to: %s\n", buf);
1465 
1466                 i += len;
1467                 sprintf(pg_result, "OK: src6=%s", buf);
1468                 return count;
1469         }
1470         if (!strcmp(name, "src_min")) {
1471                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
1472                 if (len < 0)
1473                         return len;
1474 
1475                 if (copy_from_user(buf, &user_buffer[i], len))
1476                         return -EFAULT;
1477                 buf[len] = 0;
1478                 if (strcmp(buf, pkt_dev->src_min) != 0) {
1479                         memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
1480                         strncpy(pkt_dev->src_min, buf, len);
1481                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
1482                         pkt_dev->cur_saddr = pkt_dev->saddr_min;
1483                 }
1484                 if (debug)
1485                         pr_debug("src_min set to: %s\n", pkt_dev->src_min);
1486                 i += len;
1487                 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
1488                 return count;
1489         }
1490         if (!strcmp(name, "src_max")) {
1491                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
1492                 if (len < 0)
1493                         return len;
1494 
1495                 if (copy_from_user(buf, &user_buffer[i], len))
1496                         return -EFAULT;
1497                 buf[len] = 0;
1498                 if (strcmp(buf, pkt_dev->src_max) != 0) {
1499                         memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
1500                         strncpy(pkt_dev->src_max, buf, len);
1501                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
1502                         pkt_dev->cur_saddr = pkt_dev->saddr_max;
1503                 }
1504                 if (debug)
1505                         pr_debug("src_max set to: %s\n", pkt_dev->src_max);
1506                 i += len;
1507                 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
1508                 return count;
1509         }
1510         if (!strcmp(name, "dst_mac")) {
1511                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1512                 if (len < 0)
1513                         return len;
1514 
1515                 memset(valstr, 0, sizeof(valstr));
1516                 if (copy_from_user(valstr, &user_buffer[i], len))
1517                         return -EFAULT;
1518 
1519                 if (!mac_pton(valstr, pkt_dev->dst_mac))
1520                         return -EINVAL;
1521                 /* Set up Dest MAC */
1522                 ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac);
1523 
1524                 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac);
1525                 return count;
1526         }
1527         if (!strcmp(name, "src_mac")) {
1528                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1529                 if (len < 0)
1530                         return len;
1531 
1532                 memset(valstr, 0, sizeof(valstr));
1533                 if (copy_from_user(valstr, &user_buffer[i], len))
1534                         return -EFAULT;
1535 
1536                 if (!mac_pton(valstr, pkt_dev->src_mac))
1537                         return -EINVAL;
1538                 /* Set up Src MAC */
1539                 ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac);
1540 
1541                 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac);
1542                 return count;
1543         }
1544 
1545         if (!strcmp(name, "clear_counters")) {
1546                 pktgen_clear_counters(pkt_dev);
1547                 sprintf(pg_result, "OK: Clearing counters.\n");
1548                 return count;
1549         }
1550 
1551         if (!strcmp(name, "flows")) {
1552                 len = num_arg(&user_buffer[i], 10, &value);
1553                 if (len < 0)
1554                         return len;
1555 
1556                 i += len;
1557                 if (value > MAX_CFLOWS)
1558                         value = MAX_CFLOWS;
1559 
1560                 pkt_dev->cflows = value;
1561                 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
1562                 return count;
1563         }
1564 #ifdef CONFIG_XFRM
1565         if (!strcmp(name, "spi")) {
1566                 len = num_arg(&user_buffer[i], 10, &value);
1567                 if (len < 0)
1568                         return len;
1569 
1570                 i += len;
1571                 pkt_dev->spi = value;
1572                 sprintf(pg_result, "OK: spi=%u", pkt_dev->spi);
1573                 return count;
1574         }
1575 #endif
1576         if (!strcmp(name, "flowlen")) {
1577                 len = num_arg(&user_buffer[i], 10, &value);
1578                 if (len < 0)
1579                         return len;
1580 
1581                 i += len;
1582                 pkt_dev->lflow = value;
1583                 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
1584                 return count;
1585         }
1586 
1587         if (!strcmp(name, "queue_map_min")) {
1588                 len = num_arg(&user_buffer[i], 5, &value);
1589                 if (len < 0)
1590                         return len;
1591 
1592                 i += len;
1593                 pkt_dev->queue_map_min = value;
1594                 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
1595                 return count;
1596         }
1597 
1598         if (!strcmp(name, "queue_map_max")) {
1599                 len = num_arg(&user_buffer[i], 5, &value);
1600                 if (len < 0)
1601                         return len;
1602 
1603                 i += len;
1604                 pkt_dev->queue_map_max = value;
1605                 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
1606                 return count;
1607         }
1608 
1609         if (!strcmp(name, "mpls")) {
1610                 unsigned int n, cnt;
1611 
1612                 len = get_labels(&user_buffer[i], pkt_dev);
1613                 if (len < 0)
1614                         return len;
1615                 i += len;
1616                 cnt = sprintf(pg_result, "OK: mpls=");
1617                 for (n = 0; n < pkt_dev->nr_labels; n++)
1618                         cnt += sprintf(pg_result + cnt,
1619                                        "%08x%s", ntohl(pkt_dev->labels[n]),
1620                                        n == pkt_dev->nr_labels-1 ? "" : ",");
1621 
1622                 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
1623                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1624                         pkt_dev->svlan_id = 0xffff;
1625 
1626                         if (debug)
1627                                 pr_debug("VLAN/SVLAN auto turned off\n");
1628                 }
1629                 return count;
1630         }
1631 
1632         if (!strcmp(name, "vlan_id")) {
1633                 len = num_arg(&user_buffer[i], 4, &value);
1634                 if (len < 0)
1635                         return len;
1636 
1637                 i += len;
1638                 if (value <= 4095) {
1639                         pkt_dev->vlan_id = value;  /* turn on VLAN */
1640 
1641                         if (debug)
1642                                 pr_debug("VLAN turned on\n");
1643 
1644                         if (debug && pkt_dev->nr_labels)
1645                                 pr_debug("MPLS auto turned off\n");
1646 
1647                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1648                         sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
1649                 } else {
1650                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1651                         pkt_dev->svlan_id = 0xffff;
1652 
1653                         if (debug)
1654                                 pr_debug("VLAN/SVLAN turned off\n");
1655                 }
1656                 return count;
1657         }
1658 
1659         if (!strcmp(name, "vlan_p")) {
1660                 len = num_arg(&user_buffer[i], 1, &value);
1661                 if (len < 0)
1662                         return len;
1663 
1664                 i += len;
1665                 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
1666                         pkt_dev->vlan_p = value;
1667                         sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
1668                 } else {
1669                         sprintf(pg_result, "ERROR: vlan_p must be 0-7");
1670                 }
1671                 return count;
1672         }
1673 
1674         if (!strcmp(name, "vlan_cfi")) {
1675                 len = num_arg(&user_buffer[i], 1, &value);
1676                 if (len < 0)
1677                         return len;
1678 
1679                 i += len;
1680                 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
1681                         pkt_dev->vlan_cfi = value;
1682                         sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
1683                 } else {
1684                         sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
1685                 }
1686                 return count;
1687         }
1688 
1689         if (!strcmp(name, "svlan_id")) {
1690                 len = num_arg(&user_buffer[i], 4, &value);
1691                 if (len < 0)
1692                         return len;
1693 
1694                 i += len;
1695                 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
1696                         pkt_dev->svlan_id = value;  /* turn on SVLAN */
1697 
1698                         if (debug)
1699                                 pr_debug("SVLAN turned on\n");
1700 
1701                         if (debug && pkt_dev->nr_labels)
1702                                 pr_debug("MPLS auto turned off\n");
1703 
1704                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1705                         sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
1706                 } else {
1707                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1708                         pkt_dev->svlan_id = 0xffff;
1709 
1710                         if (debug)
1711                                 pr_debug("VLAN/SVLAN turned off\n");
1712                 }
1713                 return count;
1714         }
1715 
1716         if (!strcmp(name, "svlan_p")) {
1717                 len = num_arg(&user_buffer[i], 1, &value);
1718                 if (len < 0)
1719                         return len;
1720 
1721                 i += len;
1722                 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
1723                         pkt_dev->svlan_p = value;
1724                         sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
1725                 } else {
1726                         sprintf(pg_result, "ERROR: svlan_p must be 0-7");
1727                 }
1728                 return count;
1729         }
1730 
1731         if (!strcmp(name, "svlan_cfi")) {
1732                 len = num_arg(&user_buffer[i], 1, &value);
1733                 if (len < 0)
1734                         return len;
1735 
1736                 i += len;
1737                 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
1738                         pkt_dev->svlan_cfi = value;
1739                         sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
1740                 } else {
1741                         sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
1742                 }
1743                 return count;
1744         }
1745 
1746         if (!strcmp(name, "tos")) {
1747                 __u32 tmp_value = 0;
1748                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1749                 if (len < 0)
1750                         return len;
1751 
1752                 i += len;
1753                 if (len == 2) {
1754                         pkt_dev->tos = tmp_value;
1755                         sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
1756                 } else {
1757                         sprintf(pg_result, "ERROR: tos must be 00-ff");
1758                 }
1759                 return count;
1760         }
1761 
1762         if (!strcmp(name, "traffic_class")) {
1763                 __u32 tmp_value = 0;
1764                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1765                 if (len < 0)
1766                         return len;
1767 
1768                 i += len;
1769                 if (len == 2) {
1770                         pkt_dev->traffic_class = tmp_value;
1771                         sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
1772                 } else {
1773                         sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
1774                 }
1775                 return count;
1776         }
1777 
1778         if (!strcmp(name, "skb_priority")) {
1779                 len = num_arg(&user_buffer[i], 9, &value);
1780                 if (len < 0)
1781                         return len;
1782 
1783                 i += len;
1784                 pkt_dev->skb_priority = value;
1785                 sprintf(pg_result, "OK: skb_priority=%i",
1786                         pkt_dev->skb_priority);
1787                 return count;
1788         }
1789 
1790         sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
1791         return -EINVAL;
1792 }
1793 
1794 static int pktgen_if_open(struct inode *inode, struct file *file)
1795 {
1796         return single_open(file, pktgen_if_show, PDE_DATA(inode));
1797 }
1798 
1799 static const struct file_operations pktgen_if_fops = {
1800         .owner   = THIS_MODULE,
1801         .open    = pktgen_if_open,
1802         .read    = seq_read,
1803         .llseek  = seq_lseek,
1804         .write   = pktgen_if_write,
1805         .release = single_release,
1806 };
1807 
1808 static int pktgen_thread_show(struct seq_file *seq, void *v)
1809 {
1810         struct pktgen_thread *t = seq->private;
1811         const struct pktgen_dev *pkt_dev;
1812 
1813         BUG_ON(!t);
1814 
1815         seq_puts(seq, "Running: ");
1816 
1817         rcu_read_lock();
1818         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1819                 if (pkt_dev->running)
1820                         seq_printf(seq, "%s ", pkt_dev->odevname);
1821 
1822         seq_puts(seq, "\nStopped: ");
1823 
1824         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1825                 if (!pkt_dev->running)
1826                         seq_printf(seq, "%s ", pkt_dev->odevname);
1827 
1828         if (t->result[0])
1829                 seq_printf(seq, "\nResult: %s\n", t->result);
1830         else
1831                 seq_puts(seq, "\nResult: NA\n");
1832 
1833         rcu_read_unlock();
1834 
1835         return 0;
1836 }
1837 
1838 static ssize_t pktgen_thread_write(struct file *file,
1839                                    const char __user * user_buffer,
1840                                    size_t count, loff_t * offset)
1841 {
1842         struct seq_file *seq = file->private_data;
1843         struct pktgen_thread *t = seq->private;
1844         int i, max, len, ret;
1845         char name[40];
1846         char *pg_result;
1847 
1848         if (count < 1) {
1849                 //      sprintf(pg_result, "Wrong command format");
1850                 return -EINVAL;
1851         }
1852 
1853         max = count;
1854         len = count_trail_chars(user_buffer, max);
1855         if (len < 0)
1856                 return len;
1857 
1858         i = len;
1859 
1860         /* Read variable name */
1861 
1862         len = strn_len(&user_buffer[i], sizeof(name) - 1);
1863         if (len < 0)
1864                 return len;
1865 
1866         memset(name, 0, sizeof(name));
1867         if (copy_from_user(name, &user_buffer[i], len))
1868                 return -EFAULT;
1869         i += len;
1870 
1871         max = count - i;
1872         len = count_trail_chars(&user_buffer[i], max);
1873         if (len < 0)
1874                 return len;
1875 
1876         i += len;
1877 
1878         if (debug)
1879                 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count);
1880 
1881         if (!t) {
1882                 pr_err("ERROR: No thread\n");
1883                 ret = -EINVAL;
1884                 goto out;
1885         }
1886 
1887         pg_result = &(t->result[0]);
1888 
1889         if (!strcmp(name, "add_device")) {
1890                 char f[32];
1891                 memset(f, 0, 32);
1892                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1893                 if (len < 0) {
1894                         ret = len;
1895                         goto out;
1896                 }
1897                 if (copy_from_user(f, &user_buffer[i], len))
1898                         return -EFAULT;
1899                 i += len;
1900                 mutex_lock(&pktgen_thread_lock);
1901                 ret = pktgen_add_device(t, f);
1902                 mutex_unlock(&pktgen_thread_lock);
1903                 if (!ret) {
1904                         ret = count;
1905                         sprintf(pg_result, "OK: add_device=%s", f);
1906                 } else
1907                         sprintf(pg_result, "ERROR: can not add device %s", f);
1908                 goto out;
1909         }
1910 
1911         if (!strcmp(name, "rem_device_all")) {
1912                 mutex_lock(&pktgen_thread_lock);
1913                 t->control |= T_REMDEVALL;
1914                 mutex_unlock(&pktgen_thread_lock);
1915                 schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
1916                 ret = count;
1917                 sprintf(pg_result, "OK: rem_device_all");
1918                 goto out;
1919         }
1920 
1921         if (!strcmp(name, "max_before_softirq")) {
1922                 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use");
1923                 ret = count;
1924                 goto out;
1925         }
1926 
1927         ret = -EINVAL;
1928 out:
1929         return ret;
1930 }
1931 
1932 static int pktgen_thread_open(struct inode *inode, struct file *file)
1933 {
1934         return single_open(file, pktgen_thread_show, PDE_DATA(inode));
1935 }
1936 
1937 static const struct file_operations pktgen_thread_fops = {
1938         .owner   = THIS_MODULE,
1939         .open    = pktgen_thread_open,
1940         .read    = seq_read,
1941         .llseek  = seq_lseek,
1942         .write   = pktgen_thread_write,
1943         .release = single_release,
1944 };
1945 
1946 /* Think find or remove for NN */
1947 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
1948                                               const char *ifname, int remove)
1949 {
1950         struct pktgen_thread *t;
1951         struct pktgen_dev *pkt_dev = NULL;
1952         bool exact = (remove == FIND);
1953 
1954         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1955                 pkt_dev = pktgen_find_dev(t, ifname, exact);
1956                 if (pkt_dev) {
1957                         if (remove) {
1958                                 pkt_dev->removal_mark = 1;
1959                                 t->control |= T_REMDEV;
1960                         }
1961                         break;
1962                 }
1963         }
1964         return pkt_dev;
1965 }
1966 
1967 /*
1968  * mark a device for removal
1969  */
1970 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname)
1971 {
1972         struct pktgen_dev *pkt_dev = NULL;
1973         const int max_tries = 10, msec_per_try = 125;
1974         int i = 0;
1975 
1976         mutex_lock(&pktgen_thread_lock);
1977         pr_debug("%s: marking %s for removal\n", __func__, ifname);
1978 
1979         while (1) {
1980 
1981                 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE);
1982                 if (pkt_dev == NULL)
1983                         break;  /* success */
1984 
1985                 mutex_unlock(&pktgen_thread_lock);
1986                 pr_debug("%s: waiting for %s to disappear....\n",
1987                          __func__, ifname);
1988                 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try));
1989                 mutex_lock(&pktgen_thread_lock);
1990 
1991                 if (++i >= max_tries) {
1992                         pr_err("%s: timed out after waiting %d msec for device %s to be removed\n",
1993                                __func__, msec_per_try * i, ifname);
1994                         break;
1995                 }
1996 
1997         }
1998 
1999         mutex_unlock(&pktgen_thread_lock);
2000 }
2001 
2002 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev)
2003 {
2004         struct pktgen_thread *t;
2005 
2006         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
2007                 struct pktgen_dev *pkt_dev;
2008 
2009                 rcu_read_lock();
2010                 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
2011                         if (pkt_dev->odev != dev)
2012                                 continue;
2013 
2014                         proc_remove(pkt_dev->entry);
2015 
2016                         pkt_dev->entry = proc_create_data(dev->name, 0600,
2017                                                           pn->proc_dir,
2018                                                           &pktgen_if_fops,
2019                                                           pkt_dev);
2020                         if (!pkt_dev->entry)
2021                                 pr_err("can't move proc entry for '%s'\n",
2022                                        dev->name);
2023                         break;
2024                 }
2025                 rcu_read_unlock();
2026         }
2027 }
2028 
2029 static int pktgen_device_event(struct notifier_block *unused,
2030                                unsigned long event, void *ptr)
2031 {
2032         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2033         struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id);
2034 
2035         if (pn->pktgen_exiting)
2036                 return NOTIFY_DONE;
2037 
2038         /* It is OK that we do not hold the group lock right now,
2039          * as we run under the RTNL lock.
2040          */
2041 
2042         switch (event) {
2043         case NETDEV_CHANGENAME:
2044                 pktgen_change_name(pn, dev);
2045                 break;
2046 
2047         case NETDEV_UNREGISTER:
2048                 pktgen_mark_device(pn, dev->name);
2049                 break;
2050         }
2051 
2052         return NOTIFY_DONE;
2053 }
2054 
2055 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn,
2056                                                  struct pktgen_dev *pkt_dev,
2057                                                  const char *ifname)
2058 {
2059         char b[IFNAMSIZ+5];
2060         int i;
2061 
2062         for (i = 0; ifname[i] != '@'; i++) {
2063                 if (i == IFNAMSIZ)
2064                         break;
2065 
2066                 b[i] = ifname[i];
2067         }
2068         b[i] = 0;
2069 
2070         return dev_get_by_name(pn->net, b);
2071 }
2072 
2073 
2074 /* Associate pktgen_dev with a device. */
2075 
2076 static int pktgen_setup_dev(const struct pktgen_net *pn,
2077                             struct pktgen_dev *pkt_dev, const char *ifname)
2078 {
2079         struct net_device *odev;
2080         int err;
2081 
2082         /* Clean old setups */
2083         if (pkt_dev->odev) {
2084                 dev_put(pkt_dev->odev);
2085                 pkt_dev->odev = NULL;
2086         }
2087 
2088         odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname);
2089         if (!odev) {
2090                 pr_err("no such netdevice: \"%s\"\n", ifname);
2091                 return -ENODEV;
2092         }
2093 
2094         if (odev->type != ARPHRD_ETHER) {
2095                 pr_err("not an ethernet device: \"%s\"\n", ifname);
2096                 err = -EINVAL;
2097         } else if (!netif_running(odev)) {
2098                 pr_err("device is down: \"%s\"\n", ifname);
2099                 err = -ENETDOWN;
2100         } else {
2101                 pkt_dev->odev = odev;
2102                 return 0;
2103         }
2104 
2105         dev_put(odev);
2106         return err;
2107 }
2108 
2109 /* Read pkt_dev from the interface and set up internal pktgen_dev
2110  * structure to have the right information to create/send packets
2111  */
2112 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
2113 {
2114         int ntxq;
2115 
2116         if (!pkt_dev->odev) {
2117                 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n");
2118                 sprintf(pkt_dev->result,
2119                         "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
2120                 return;
2121         }
2122 
2123         /* make sure that we don't pick a non-existing transmit queue */
2124         ntxq = pkt_dev->odev->real_num_tx_queues;
2125 
2126         if (ntxq <= pkt_dev->queue_map_min) {
2127                 pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2128                         pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq,
2129                         pkt_dev->odevname);
2130                 pkt_dev->queue_map_min = (ntxq ?: 1) - 1;
2131         }
2132         if (pkt_dev->queue_map_max >= ntxq) {
2133                 pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2134                         pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq,
2135                         pkt_dev->odevname);
2136                 pkt_dev->queue_map_max = (ntxq ?: 1) - 1;
2137         }
2138 
2139         /* Default to the interface's mac if not explicitly set. */
2140 
2141         if (is_zero_ether_addr(pkt_dev->src_mac))
2142                 ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr);
2143 
2144         /* Set up Dest MAC */
2145         ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac);
2146 
2147         if (pkt_dev->flags & F_IPV6) {
2148                 int i, set = 0, err = 1;
2149                 struct inet6_dev *idev;
2150 
2151                 if (pkt_dev->min_pkt_size == 0) {
2152                         pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
2153                                                 + sizeof(struct udphdr)
2154                                                 + sizeof(struct pktgen_hdr)
2155                                                 + pkt_dev->pkt_overhead;
2156                 }
2157 
2158                 for (i = 0; i < IN6_ADDR_HSIZE; i++)
2159                         if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
2160                                 set = 1;
2161                                 break;
2162                         }
2163 
2164                 if (!set) {
2165 
2166                         /*
2167                          * Use linklevel address if unconfigured.
2168                          *
2169                          * use ipv6_get_lladdr if/when it's get exported
2170                          */
2171 
2172                         rcu_read_lock();
2173                         idev = __in6_dev_get(pkt_dev->odev);
2174                         if (idev) {
2175                                 struct inet6_ifaddr *ifp;
2176 
2177                                 read_lock_bh(&idev->lock);
2178                                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2179                                         if ((ifp->scope & IFA_LINK) &&
2180                                             !(ifp->flags & IFA_F_TENTATIVE)) {
2181                                                 pkt_dev->cur_in6_saddr = ifp->addr;
2182                                                 err = 0;
2183                                                 break;
2184                                         }
2185                                 }
2186                                 read_unlock_bh(&idev->lock);
2187                         }
2188                         rcu_read_unlock();
2189                         if (err)
2190                                 pr_err("ERROR: IPv6 link address not available\n");
2191                 }
2192         } else {
2193                 if (pkt_dev->min_pkt_size == 0) {
2194                         pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr)
2195                                                 + sizeof(struct udphdr)
2196                                                 + sizeof(struct pktgen_hdr)
2197                                                 + pkt_dev->pkt_overhead;
2198                 }
2199 
2200                 pkt_dev->saddr_min = 0;
2201                 pkt_dev->saddr_max = 0;
2202                 if (strlen(pkt_dev->src_min) == 0) {
2203 
2204                         struct in_device *in_dev;
2205 
2206                         rcu_read_lock();
2207                         in_dev = __in_dev_get_rcu(pkt_dev->odev);
2208                         if (in_dev) {
2209                                 if (in_dev->ifa_list) {
2210                                         pkt_dev->saddr_min =
2211                                             in_dev->ifa_list->ifa_address;
2212                                         pkt_dev->saddr_max = pkt_dev->saddr_min;
2213                                 }
2214                         }
2215                         rcu_read_unlock();
2216                 } else {
2217                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
2218                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
2219                 }
2220 
2221                 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
2222                 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
2223         }
2224         /* Initialize current values. */
2225         pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
2226         if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size)
2227                 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size;
2228 
2229         pkt_dev->cur_dst_mac_offset = 0;
2230         pkt_dev->cur_src_mac_offset = 0;
2231         pkt_dev->cur_saddr = pkt_dev->saddr_min;
2232         pkt_dev->cur_daddr = pkt_dev->daddr_min;
2233         pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2234         pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2235         pkt_dev->nflows = 0;
2236 }
2237 
2238 
2239 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
2240 {
2241         ktime_t start_time, end_time;
2242         s64 remaining;
2243         struct hrtimer_sleeper t;
2244 
2245         hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
2246         hrtimer_set_expires(&t.timer, spin_until);
2247 
2248         remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
2249         if (remaining <= 0) {
2250                 pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2251                 return;
2252         }
2253 
2254         start_time = ktime_get();
2255         if (remaining < 100000) {
2256                 /* for small delays (<100us), just loop until limit is reached */
2257                 do {
2258                         end_time = ktime_get();
2259                 } while (ktime_compare(end_time, spin_until) < 0);
2260         } else {
2261                 /* see do_nanosleep */
2262                 hrtimer_init_sleeper(&t, current);
2263                 do {
2264                         set_current_state(TASK_INTERRUPTIBLE);
2265                         hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
2266 
2267                         if (likely(t.task))
2268                                 schedule();
2269 
2270                         hrtimer_cancel(&t.timer);
2271                 } while (t.task && pkt_dev->running && !signal_pending(current));
2272                 __set_current_state(TASK_RUNNING);
2273                 end_time = ktime_get();
2274         }
2275 
2276         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
2277         pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2278 }
2279 
2280 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
2281 {
2282         pkt_dev->pkt_overhead = 0;
2283         pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
2284         pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
2285         pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
2286 }
2287 
2288 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow)
2289 {
2290         return !!(pkt_dev->flows[flow].flags & F_INIT);
2291 }
2292 
2293 static inline int f_pick(struct pktgen_dev *pkt_dev)
2294 {
2295         int flow = pkt_dev->curfl;
2296 
2297         if (pkt_dev->flags & F_FLOW_SEQ) {
2298                 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) {
2299                         /* reset time */
2300                         pkt_dev->flows[flow].count = 0;
2301                         pkt_dev->flows[flow].flags = 0;
2302                         pkt_dev->curfl += 1;
2303                         if (pkt_dev->curfl >= pkt_dev->cflows)
2304                                 pkt_dev->curfl = 0; /*reset */
2305                 }
2306         } else {
2307                 flow = prandom_u32() % pkt_dev->cflows;
2308                 pkt_dev->curfl = flow;
2309 
2310                 if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
2311                         pkt_dev->flows[flow].count = 0;
2312                         pkt_dev->flows[flow].flags = 0;
2313                 }
2314         }
2315 
2316         return pkt_dev->curfl;
2317 }
2318 
2319 
2320 #ifdef CONFIG_XFRM
2321 /* If there was already an IPSEC SA, we keep it as is, else
2322  * we go look for it ...
2323 */
2324 #define DUMMY_MARK 0
2325 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
2326 {
2327         struct xfrm_state *x = pkt_dev->flows[flow].x;
2328         struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id);
2329         if (!x) {
2330 
2331                 if (pkt_dev->spi) {
2332                         /* We need as quick as possible to find the right SA
2333                          * Searching with minimum criteria to archieve this.
2334                          */
2335                         x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET);
2336                 } else {
2337                         /* slow path: we dont already have xfrm_state */
2338                         x = xfrm_stateonly_find(pn->net, DUMMY_MARK,
2339                                                 (xfrm_address_t *)&pkt_dev->cur_daddr,
2340                                                 (xfrm_address_t *)&pkt_dev->cur_saddr,
2341                                                 AF_INET,
2342                                                 pkt_dev->ipsmode,
2343                                                 pkt_dev->ipsproto, 0);
2344                 }
2345                 if (x) {
2346                         pkt_dev->flows[flow].x = x;
2347                         set_pkt_overhead(pkt_dev);
2348                         pkt_dev->pkt_overhead += x->props.header_len;
2349                 }
2350 
2351         }
2352 }
2353 #endif
2354 static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
2355 {
2356 
2357         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
2358                 pkt_dev->cur_queue_map = smp_processor_id();
2359 
2360         else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
2361                 __u16 t;
2362                 if (pkt_dev->flags & F_QUEUE_MAP_RND) {
2363                         t = prandom_u32() %
2364                                 (pkt_dev->queue_map_max -
2365                                  pkt_dev->queue_map_min + 1)
2366                                 + pkt_dev->queue_map_min;
2367                 } else {
2368                         t = pkt_dev->cur_queue_map + 1;
2369                         if (t > pkt_dev->queue_map_max)
2370                                 t = pkt_dev->queue_map_min;
2371                 }
2372                 pkt_dev->cur_queue_map = t;
2373         }
2374         pkt_dev->cur_queue_map  = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
2375 }
2376 
2377 /* Increment/randomize headers according to flags and current values
2378  * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
2379  */
2380 static void mod_cur_headers(struct pktgen_dev *pkt_dev)
2381 {
2382         __u32 imn;
2383         __u32 imx;
2384         int flow = 0;
2385 
2386         if (pkt_dev->cflows)
2387                 flow = f_pick(pkt_dev);
2388 
2389         /*  Deal with source MAC */
2390         if (pkt_dev->src_mac_count > 1) {
2391                 __u32 mc;
2392                 __u32 tmp;
2393 
2394                 if (pkt_dev->flags & F_MACSRC_RND)
2395                         mc = prandom_u32() % pkt_dev->src_mac_count;
2396                 else {
2397                         mc = pkt_dev->cur_src_mac_offset++;
2398                         if (pkt_dev->cur_src_mac_offset >=
2399                             pkt_dev->src_mac_count)
2400                                 pkt_dev->cur_src_mac_offset = 0;
2401                 }
2402 
2403                 tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
2404                 pkt_dev->hh[11] = tmp;
2405                 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2406                 pkt_dev->hh[10] = tmp;
2407                 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2408                 pkt_dev->hh[9] = tmp;
2409                 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2410                 pkt_dev->hh[8] = tmp;
2411                 tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
2412                 pkt_dev->hh[7] = tmp;
2413         }
2414 
2415         /*  Deal with Destination MAC */
2416         if (pkt_dev->dst_mac_count > 1) {
2417                 __u32 mc;
2418                 __u32 tmp;
2419 
2420                 if (pkt_dev->flags & F_MACDST_RND)
2421                         mc = prandom_u32() % pkt_dev->dst_mac_count;
2422 
2423                 else {
2424                         mc = pkt_dev->cur_dst_mac_offset++;
2425                         if (pkt_dev->cur_dst_mac_offset >=
2426                             pkt_dev->dst_mac_count) {
2427                                 pkt_dev->cur_dst_mac_offset = 0;
2428                         }
2429                 }
2430 
2431                 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
2432                 pkt_dev->hh[5] = tmp;
2433                 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2434                 pkt_dev->hh[4] = tmp;
2435                 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2436                 pkt_dev->hh[3] = tmp;
2437                 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2438                 pkt_dev->hh[2] = tmp;
2439                 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
2440                 pkt_dev->hh[1] = tmp;
2441         }
2442 
2443         if (pkt_dev->flags & F_MPLS_RND) {
2444                 unsigned int i;
2445                 for (i = 0; i < pkt_dev->nr_labels; i++)
2446                         if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM)
2447                                 pkt_dev->labels[i] = MPLS_STACK_BOTTOM |
2448                                              ((__force __be32)prandom_u32() &
2449                                                       htonl(0x000fffff));
2450         }
2451 
2452         if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
2453                 pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
2454         }
2455 
2456         if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
2457                 pkt_dev->svlan_id = prandom_u32() & (4096 - 1);
2458         }
2459 
2460         if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
2461                 if (pkt_dev->flags & F_UDPSRC_RND)
2462                         pkt_dev->cur_udp_src = prandom_u32() %
2463                                 (pkt_dev->udp_src_max - pkt_dev->udp_src_min)
2464                                 + pkt_dev->udp_src_min;
2465 
2466                 else {
2467                         pkt_dev->cur_udp_src++;
2468                         if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
2469                                 pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2470                 }
2471         }
2472 
2473         if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
2474                 if (pkt_dev->flags & F_UDPDST_RND) {
2475                         pkt_dev->cur_udp_dst = prandom_u32() %
2476                                 (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
2477                                 + pkt_dev->udp_dst_min;
2478                 } else {
2479                         pkt_dev->cur_udp_dst++;
2480                         if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
2481                                 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2482                 }
2483         }
2484 
2485         if (!(pkt_dev->flags & F_IPV6)) {
2486 
2487                 imn = ntohl(pkt_dev->saddr_min);
2488                 imx = ntohl(pkt_dev->saddr_max);
2489                 if (imn < imx) {
2490                         __u32 t;
2491                         if (pkt_dev->flags & F_IPSRC_RND)
2492                                 t = prandom_u32() % (imx - imn) + imn;
2493                         else {
2494                                 t = ntohl(pkt_dev->cur_saddr);
2495                                 t++;
2496                                 if (t > imx)
2497                                         t = imn;
2498 
2499                         }
2500                         pkt_dev->cur_saddr = htonl(t);
2501                 }
2502 
2503                 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) {
2504                         pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
2505                 } else {
2506                         imn = ntohl(pkt_dev->daddr_min);
2507                         imx = ntohl(pkt_dev->daddr_max);
2508                         if (imn < imx) {
2509                                 __u32 t;
2510                                 __be32 s;
2511                                 if (pkt_dev->flags & F_IPDST_RND) {
2512 
2513                                         do {
2514                                                 t = prandom_u32() %
2515                                                         (imx - imn) + imn;
2516                                                 s = htonl(t);
2517                                         } while (ipv4_is_loopback(s) ||
2518                                                 ipv4_is_multicast(s) ||
2519                                                 ipv4_is_lbcast(s) ||
2520                                                 ipv4_is_zeronet(s) ||
2521                                                 ipv4_is_local_multicast(s));
2522                                         pkt_dev->cur_daddr = s;
2523                                 } else {
2524                                         t = ntohl(pkt_dev->cur_daddr);
2525                                         t++;
2526                                         if (t > imx) {
2527                                                 t = imn;
2528                                         }
2529                                         pkt_dev->cur_daddr = htonl(t);
2530                                 }
2531                         }
2532                         if (pkt_dev->cflows) {
2533                                 pkt_dev->flows[flow].flags |= F_INIT;
2534                                 pkt_dev->flows[flow].cur_daddr =
2535                                     pkt_dev->cur_daddr;
2536 #ifdef CONFIG_XFRM
2537                                 if (pkt_dev->flags & F_IPSEC_ON)
2538                                         get_ipsec_sa(pkt_dev, flow);
2539 #endif
2540                                 pkt_dev->nflows++;
2541                         }
2542                 }
2543         } else {                /* IPV6 * */
2544 
2545                 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
2546                         int i;
2547 
2548                         /* Only random destinations yet */
2549 
2550                         for (i = 0; i < 4; i++) {
2551                                 pkt_dev->cur_in6_daddr.s6_addr32[i] =
2552                                     (((__force __be32)prandom_u32() |
2553                                       pkt_dev->min_in6_daddr.s6_addr32[i]) &
2554                                      pkt_dev->max_in6_daddr.s6_addr32[i]);
2555                         }
2556                 }
2557         }
2558 
2559         if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
2560                 __u32 t;
2561                 if (pkt_dev->flags & F_TXSIZE_RND) {
2562                         t = prandom_u32() %
2563                                 (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
2564                                 + pkt_dev->min_pkt_size;
2565                 } else {
2566                         t = pkt_dev->cur_pkt_size + 1;
2567                         if (t > pkt_dev->max_pkt_size)
2568                                 t = pkt_dev->min_pkt_size;
2569                 }
2570                 pkt_dev->cur_pkt_size = t;
2571         }
2572 
2573         set_cur_queue_map(pkt_dev);
2574 
2575         pkt_dev->flows[flow].count++;
2576 }
2577 
2578 
2579 #ifdef CONFIG_XFRM
2580 static u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
2581 
2582         [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
2583 };
2584 
2585 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
2586 {
2587         struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2588         int err = 0;
2589         struct net *net = dev_net(pkt_dev->odev);
2590 
2591         if (!x)
2592                 return 0;
2593         /* XXX: we dont support tunnel mode for now until
2594          * we resolve the dst issue */
2595         if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0))
2596                 return 0;
2597 
2598         /* But when user specify an valid SPI, transformation
2599          * supports both transport/tunnel mode + ESP/AH type.
2600          */
2601         if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0))
2602                 skb->_skb_refdst = (unsigned long)&pkt_dev->dst | SKB_DST_NOREF;
2603 
2604         rcu_read_lock_bh();
2605         err = x->outer_mode->output(x, skb);
2606         rcu_read_unlock_bh();
2607         if (err) {
2608                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
2609                 goto error;
2610         }
2611         err = x->type->output(x, skb);
2612         if (err) {
2613                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
2614                 goto error;
2615         }
2616         spin_lock_bh(&x->lock);
2617         x->curlft.bytes += skb->len;
2618         x->curlft.packets++;
2619         spin_unlock_bh(&x->lock);
2620 error:
2621         return err;
2622 }
2623 
2624 static void free_SAs(struct pktgen_dev *pkt_dev)
2625 {
2626         if (pkt_dev->cflows) {
2627                 /* let go of the SAs if we have them */
2628                 int i;
2629                 for (i = 0; i < pkt_dev->cflows; i++) {
2630                         struct xfrm_state *x = pkt_dev->flows[i].x;
2631                         if (x) {
2632                                 xfrm_state_put(x);
2633                                 pkt_dev->flows[i].x = NULL;
2634                         }
2635                 }
2636         }
2637 }
2638 
2639 static int process_ipsec(struct pktgen_dev *pkt_dev,
2640                               struct sk_buff *skb, __be16 protocol)
2641 {
2642         if (pkt_dev->flags & F_IPSEC_ON) {
2643                 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2644                 int nhead = 0;
2645                 if (x) {
2646                         struct ethhdr *eth;
2647                         struct iphdr *iph;
2648                         int ret;
2649 
2650                         nhead = x->props.header_len - skb_headroom(skb);
2651                         if (nhead > 0) {
2652                                 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
2653                                 if (ret < 0) {
2654                                         pr_err("Error expanding ipsec packet %d\n",
2655                                                ret);
2656                                         goto err;
2657                                 }
2658                         }
2659 
2660                         /* ipsec is not expecting ll header */
2661                         skb_pull(skb, ETH_HLEN);
2662                         ret = pktgen_output_ipsec(skb, pkt_dev);
2663                         if (ret) {
2664                                 pr_err("Error creating ipsec packet %d\n", ret);
2665                                 goto err;
2666                         }
2667                         /* restore ll */
2668                         eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
2669                         memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN);
2670                         eth->h_proto = protocol;
2671 
2672                         /* Update IPv4 header len as well as checksum value */
2673                         iph = ip_hdr(skb);
2674                         iph->tot_len = htons(skb->len - ETH_HLEN);
2675                         ip_send_check(iph);
2676                 }
2677         }
2678         return 1;
2679 err:
2680         kfree_skb(skb);
2681         return 0;
2682 }
2683 #endif
2684 
2685 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
2686 {
2687         unsigned int i;
2688         for (i = 0; i < pkt_dev->nr_labels; i++)
2689                 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM;
2690 
2691         mpls--;
2692         *mpls |= MPLS_STACK_BOTTOM;
2693 }
2694 
2695 static inline __be16 build_tci(unsigned int id, unsigned int cfi,
2696                                unsigned int prio)
2697 {
2698         return htons(id | (cfi << 12) | (prio << 13));
2699 }
2700 
2701 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
2702                                 int datalen)
2703 {
2704         struct timeval timestamp;
2705         struct pktgen_hdr *pgh;
2706 
2707         pgh = (struct pktgen_hdr *)skb_put(skb, sizeof(*pgh));
2708         datalen -= sizeof(*pgh);
2709 
2710         if (pkt_dev->nfrags <= 0) {
2711                 memset(skb_put(skb, datalen), 0, datalen);
2712         } else {
2713                 int frags = pkt_dev->nfrags;
2714                 int i, len;
2715                 int frag_len;
2716 
2717 
2718                 if (frags > MAX_SKB_FRAGS)
2719                         frags = MAX_SKB_FRAGS;
2720                 len = datalen - frags * PAGE_SIZE;
2721                 if (len > 0) {
2722                         memset(skb_put(skb, len), 0, len);
2723                         datalen = frags * PAGE_SIZE;
2724                 }
2725 
2726                 i = 0;
2727                 frag_len = (datalen/frags) < PAGE_SIZE ?
2728                            (datalen/frags) : PAGE_SIZE;
2729                 while (datalen > 0) {
2730                         if (unlikely(!pkt_dev->page)) {
2731                                 int node = numa_node_id();
2732 
2733                                 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
2734                                         node = pkt_dev->node;
2735                                 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
2736                                 if (!pkt_dev->page)
2737                                         break;
2738                         }
2739                         get_page(pkt_dev->page);
2740                         skb_frag_set_page(skb, i, pkt_dev->page);
2741                         skb_shinfo(skb)->frags[i].page_offset = 0;
2742                         /*last fragment, fill rest of data*/
2743                         if (i == (frags - 1))
2744                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i],
2745                                     (datalen < PAGE_SIZE ? datalen : PAGE_SIZE));
2746                         else
2747                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len);
2748                         datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
2749                         skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2750                         skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2751                         i++;
2752                         skb_shinfo(skb)->nr_frags = i;
2753                 }
2754         }
2755 
2756         /* Stamp the time, and sequence number,
2757          * convert them to network byte order
2758          */
2759         pgh->pgh_magic = htonl(PKTGEN_MAGIC);
2760         pgh->seq_num = htonl(pkt_dev->seq_num);
2761 
2762         if (pkt_dev->flags & F_NO_TIMESTAMP) {
2763                 pgh->tv_sec = 0;
2764                 pgh->tv_usec = 0;
2765         } else {
2766                 do_gettimeofday(&timestamp);
2767                 pgh->tv_sec = htonl(timestamp.tv_sec);
2768                 pgh->tv_usec = htonl(timestamp.tv_usec);
2769         }
2770 }
2771 
2772 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
2773                                         struct pktgen_dev *pkt_dev,
2774                                         unsigned int extralen)
2775 {
2776         struct sk_buff *skb = NULL;
2777         unsigned int size = pkt_dev->cur_pkt_size + 64 + extralen +
2778                             pkt_dev->pkt_overhead;
2779 
2780         if (pkt_dev->flags & F_NODE) {
2781                 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
2782 
2783                 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node);
2784                 if (likely(skb)) {
2785                         skb_reserve(skb, NET_SKB_PAD);
2786                         skb->dev = dev;
2787                 }
2788         } else {
2789                  skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
2790         }
2791 
2792         return skb;
2793 }
2794 
2795 static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
2796                                         struct pktgen_dev *pkt_dev)
2797 {
2798         struct sk_buff *skb = NULL;
2799         __u8 *eth;
2800         struct udphdr *udph;
2801         int datalen, iplen;
2802         struct iphdr *iph;
2803         __be16 protocol = htons(ETH_P_IP);
2804         __be32 *mpls;
2805         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2806         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2807         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2808         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2809         u16 queue_map;
2810 
2811         if (pkt_dev->nr_labels)
2812                 protocol = htons(ETH_P_MPLS_UC);
2813 
2814         if (pkt_dev->vlan_id != 0xffff)
2815                 protocol = htons(ETH_P_8021Q);
2816 
2817         /* Update any of the values, used when we're incrementing various
2818          * fields.
2819          */
2820         mod_cur_headers(pkt_dev);
2821         queue_map = pkt_dev->cur_queue_map;
2822 
2823         datalen = (odev->hard_header_len + 16) & ~0xf;
2824 
2825         skb = pktgen_alloc_skb(odev, pkt_dev, datalen);
2826         if (!skb) {
2827                 sprintf(pkt_dev->result, "No memory");
2828                 return NULL;
2829         }
2830 
2831         prefetchw(skb->data);
2832         skb_reserve(skb, datalen);
2833 
2834         /*  Reserve for ethernet and IP header  */
2835         eth = (__u8 *) skb_push(skb, 14);
2836         mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
2837         if (pkt_dev->nr_labels)
2838                 mpls_push(mpls, pkt_dev);
2839 
2840         if (pkt_dev->vlan_id != 0xffff) {
2841                 if (pkt_dev->svlan_id != 0xffff) {
2842                         svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2843                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2844                                                pkt_dev->svlan_cfi,
2845                                                pkt_dev->svlan_p);
2846                         svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2847                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2848                 }
2849                 vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2850                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2851                                       pkt_dev->vlan_cfi,
2852                                       pkt_dev->vlan_p);
2853                 vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2854                 *vlan_encapsulated_proto = htons(ETH_P_IP);
2855         }
2856 
2857         skb_set_mac_header(skb, 0);
2858         skb_set_network_header(skb, skb->len);
2859         iph = (struct iphdr *) skb_put(skb, sizeof(struct iphdr));
2860 
2861         skb_set_transport_header(skb, skb->len);
2862         udph = (struct udphdr *) skb_put(skb, sizeof(struct udphdr));
2863         skb_set_queue_mapping(skb, queue_map);
2864         skb->priority = pkt_dev->skb_priority;
2865 
2866         memcpy(eth, pkt_dev->hh, 12);
2867         *(__be16 *) & eth[12] = protocol;
2868 
2869         /* Eth + IPh + UDPh + mpls */
2870         datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
2871                   pkt_dev->pkt_overhead;
2872         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr))
2873                 datalen = sizeof(struct pktgen_hdr);
2874 
2875         udph->source = htons(pkt_dev->cur_udp_src);
2876         udph->dest = htons(pkt_dev->cur_udp_dst);
2877         udph->len = htons(datalen + 8); /* DATA + udphdr */
2878         udph->check = 0;
2879 
2880         iph->ihl = 5;
2881         iph->version = 4;
2882         iph->ttl = 32;
2883         iph->tos = pkt_dev->tos;
2884         iph->protocol = IPPROTO_UDP;    /* UDP */
2885         iph->saddr = pkt_dev->cur_saddr;
2886         iph->daddr = pkt_dev->cur_daddr;
2887         iph->id = htons(pkt_dev->ip_id);
2888         pkt_dev->ip_id++;
2889         iph->frag_off = 0;
2890         iplen = 20 + 8 + datalen;
2891         iph->tot_len = htons(iplen);
2892         ip_send_check(iph);
2893         skb->protocol = protocol;
2894         skb->dev = odev;
2895         skb->pkt_type = PACKET_HOST;
2896 
2897         pktgen_finalize_skb(pkt_dev, skb, datalen);
2898 
2899         if (!(pkt_dev->flags & F_UDPCSUM)) {
2900                 skb->ip_summed = CHECKSUM_NONE;
2901         } else if (odev->features & NETIF_F_V4_CSUM) {
2902                 skb->ip_summed = CHECKSUM_PARTIAL;
2903                 skb->csum = 0;
2904                 udp4_hwcsum(skb, iph->saddr, iph->daddr);
2905         } else {
2906                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0);
2907 
2908                 /* add protocol-dependent pseudo-header */
2909                 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
2910                                                 datalen + 8, IPPROTO_UDP, csum);
2911 
2912                 if (udph->check == 0)
2913                         udph->check = CSUM_MANGLED_0;
2914         }
2915 
2916 #ifdef CONFIG_XFRM
2917         if (!process_ipsec(pkt_dev, skb, protocol))
2918                 return NULL;
2919 #endif
2920 
2921         return skb;
2922 }
2923 
2924 static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
2925                                         struct pktgen_dev *pkt_dev)
2926 {
2927         struct sk_buff *skb = NULL;
2928         __u8 *eth;
2929         struct udphdr *udph;
2930         int datalen, udplen;
2931         struct ipv6hdr *iph;
2932         __be16 protocol = htons(ETH_P_IPV6);
2933         __be32 *mpls;
2934         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2935         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2936         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2937         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2938         u16 queue_map;
2939 
2940         if (pkt_dev->nr_labels)
2941                 protocol = htons(ETH_P_MPLS_UC);
2942 
2943         if (pkt_dev->vlan_id != 0xffff)
2944                 protocol = htons(ETH_P_8021Q);
2945 
2946         /* Update any of the values, used when we're incrementing various
2947          * fields.
2948          */
2949         mod_cur_headers(pkt_dev);
2950         queue_map = pkt_dev->cur_queue_map;
2951 
2952         skb = pktgen_alloc_skb(odev, pkt_dev, 16);
2953         if (!skb) {
2954                 sprintf(pkt_dev->result, "No memory");
2955                 return NULL;
2956         }
2957 
2958         prefetchw(skb->data);
2959         skb_reserve(skb, 16);
2960 
2961         /*  Reserve for ethernet and IP header  */
2962         eth = (__u8 *) skb_push(skb, 14);
2963         mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
2964         if (pkt_dev->nr_labels)
2965                 mpls_push(mpls, pkt_dev);
2966 
2967         if (pkt_dev->vlan_id != 0xffff) {
2968                 if (pkt_dev->svlan_id != 0xffff) {
2969                         svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2970                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2971                                                pkt_dev->svlan_cfi,
2972                                                pkt_dev->svlan_p);
2973                         svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2974                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2975                 }
2976                 vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2977                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2978                                       pkt_dev->vlan_cfi,
2979                                       pkt_dev->vlan_p);
2980                 vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2981                 *vlan_encapsulated_proto = htons(ETH_P_IPV6);
2982         }
2983 
2984         skb_set_mac_header(skb, 0);
2985         skb_set_network_header(skb, skb->len);
2986         iph = (struct ipv6hdr *) skb_put(skb, sizeof(struct ipv6hdr));
2987 
2988         skb_set_transport_header(skb, skb->len);
2989         udph = (struct udphdr *) skb_put(skb, sizeof(struct udphdr));
2990         skb_set_queue_mapping(skb, queue_map);
2991         skb->priority = pkt_dev->skb_priority;
2992 
2993         memcpy(eth, pkt_dev->hh, 12);
2994         *(__be16 *) &eth[12] = protocol;
2995 
2996         /* Eth + IPh + UDPh + mpls */
2997         datalen = pkt_dev->cur_pkt_size - 14 -
2998                   sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
2999                   pkt_dev->pkt_overhead;
3000 
3001         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) {
3002                 datalen = sizeof(struct pktgen_hdr);
3003                 net_info_ratelimited("increased datalen to %d\n", datalen);
3004         }
3005 
3006         udplen = datalen + sizeof(struct udphdr);
3007         udph->source = htons(pkt_dev->cur_udp_src);
3008         udph->dest = htons(pkt_dev->cur_udp_dst);
3009         udph->len = htons(udplen);
3010         udph->check = 0;
3011 
3012         *(__be32 *) iph = htonl(0x60000000);    /* Version + flow */
3013 
3014         if (pkt_dev->traffic_class) {
3015                 /* Version + traffic class + flow (0) */
3016                 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20));
3017         }
3018 
3019         iph->hop_limit = 32;
3020 
3021         iph->payload_len = htons(udplen);
3022         iph->nexthdr = IPPROTO_UDP;
3023 
3024         iph->daddr = pkt_dev->cur_in6_daddr;
3025         iph->saddr = pkt_dev->cur_in6_saddr;
3026 
3027         skb->protocol = protocol;
3028         skb->dev = odev;
3029         skb->pkt_type = PACKET_HOST;
3030 
3031         pktgen_finalize_skb(pkt_dev, skb, datalen);
3032 
3033         if (!(pkt_dev->flags & F_UDPCSUM)) {
3034                 skb->ip_summed = CHECKSUM_NONE;
3035         } else if (odev->features & NETIF_F_V6_CSUM) {
3036                 skb->ip_summed = CHECKSUM_PARTIAL;
3037                 skb->csum_start = skb_transport_header(skb) - skb->head;
3038                 skb->csum_offset = offsetof(struct udphdr, check);
3039                 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
3040         } else {
3041                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0);
3042 
3043                 /* add protocol-dependent pseudo-header */
3044                 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
3045 
3046                 if (udph->check == 0)
3047                         udph->check = CSUM_MANGLED_0;
3048         }
3049 
3050         return skb;
3051 }
3052 
3053 static struct sk_buff *fill_packet(struct net_device *odev,
3054                                    struct pktgen_dev *pkt_dev)
3055 {
3056         if (pkt_dev->flags & F_IPV6)
3057                 return fill_packet_ipv6(odev, pkt_dev);
3058         else
3059                 return fill_packet_ipv4(odev, pkt_dev);
3060 }
3061 
3062 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
3063 {
3064         pkt_dev->seq_num = 1;
3065         pkt_dev->idle_acc = 0;
3066         pkt_dev->sofar = 0;
3067         pkt_dev->tx_bytes = 0;
3068         pkt_dev->errors = 0;
3069 }
3070 
3071 /* Set up structure for sending pkts, clear counters */
3072 
3073 static void pktgen_run(struct pktgen_thread *t)
3074 {
3075         struct pktgen_dev *pkt_dev;
3076         int started = 0;
3077 
3078         func_enter();
3079 
3080         rcu_read_lock();
3081         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3082 
3083                 /*
3084                  * setup odev and create initial packet.
3085                  */
3086                 pktgen_setup_inject(pkt_dev);
3087 
3088                 if (pkt_dev->odev) {
3089                         pktgen_clear_counters(pkt_dev);
3090                         pkt_dev->skb = NULL;
3091                         pkt_dev->started_at = pkt_dev->next_tx = ktime_get();
3092 
3093                         set_pkt_overhead(pkt_dev);
3094 
3095                         strcpy(pkt_dev->result, "Starting");
3096                         pkt_dev->running = 1;   /* Cranke yeself! */
3097                         started++;
3098                 } else
3099                         strcpy(pkt_dev->result, "Error starting");
3100         }
3101         rcu_read_unlock();
3102         if (started)
3103                 t->control &= ~(T_STOP);
3104 }
3105 
3106 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn)
3107 {
3108         struct pktgen_thread *t;
3109 
3110         func_enter();
3111 
3112         mutex_lock(&pktgen_thread_lock);
3113 
3114         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3115                 t->control |= T_STOP;
3116 
3117         mutex_unlock(&pktgen_thread_lock);
3118 }
3119 
3120 static int thread_is_running(const struct pktgen_thread *t)
3121 {
3122         const struct pktgen_dev *pkt_dev;
3123 
3124         rcu_read_lock();
3125         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
3126                 if (pkt_dev->running) {
3127                         rcu_read_unlock();
3128                         return 1;
3129                 }
3130         rcu_read_unlock();
3131         return 0;
3132 }
3133 
3134 static int pktgen_wait_thread_run(struct pktgen_thread *t)
3135 {
3136         while (thread_is_running(t)) {
3137 
3138                 msleep_interruptible(100);
3139 
3140                 if (signal_pending(current))
3141                         goto signal;
3142         }
3143         return 1;
3144 signal:
3145         return 0;
3146 }
3147 
3148 static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
3149 {
3150         struct pktgen_thread *t;
3151         int sig = 1;
3152 
3153         mutex_lock(&pktgen_thread_lock);
3154 
3155         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
3156                 sig = pktgen_wait_thread_run(t);
3157                 if (sig == 0)
3158                         break;
3159         }
3160 
3161         if (sig == 0)
3162                 list_for_each_entry(t, &pn->pktgen_threads, th_list)
3163                         t->control |= (T_STOP);
3164 
3165         mutex_unlock(&pktgen_thread_lock);
3166         return sig;
3167 }
3168 
3169 static void pktgen_run_all_threads(struct pktgen_net *pn)
3170 {
3171         struct pktgen_thread *t;
3172 
3173         func_enter();
3174 
3175         mutex_lock(&pktgen_thread_lock);
3176 
3177         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3178                 t->control |= (T_RUN);
3179 
3180         mutex_unlock(&pktgen_thread_lock);
3181 
3182         /* Propagate thread->control  */
3183         schedule_timeout_interruptible(msecs_to_jiffies(125));
3184 
3185         pktgen_wait_all_threads_run(pn);
3186 }
3187 
3188 static void pktgen_reset_all_threads(struct pktgen_net *pn)
3189 {
3190         struct pktgen_thread *t;
3191 
3192         func_enter();
3193 
3194         mutex_lock(&pktgen_thread_lock);
3195 
3196         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3197                 t->control |= (T_REMDEVALL);
3198 
3199         mutex_unlock(&pktgen_thread_lock);
3200 
3201         /* Propagate thread->control  */
3202         schedule_timeout_interruptible(msecs_to_jiffies(125));
3203 
3204         pktgen_wait_all_threads_run(pn);
3205 }
3206 
3207 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
3208 {
3209         __u64 bps, mbps, pps;
3210         char *p = pkt_dev->result;
3211         ktime_t elapsed = ktime_sub(pkt_dev->stopped_at,
3212                                     pkt_dev->started_at);
3213         ktime_t idle = ns_to_ktime(pkt_dev->idle_acc);
3214 
3215         p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
3216                      (unsigned long long)ktime_to_us(elapsed),
3217                      (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)),
3218                      (unsigned long long)ktime_to_us(idle),
3219                      (unsigned long long)pkt_dev->sofar,
3220                      pkt_dev->cur_pkt_size, nr_frags);
3221 
3222         pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
3223                         ktime_to_ns(elapsed));
3224 
3225         bps = pps * 8 * pkt_dev->cur_pkt_size;
3226 
3227         mbps = bps;
3228         do_div(mbps, 1000000);
3229         p += sprintf(p, "  %llupps %lluMb/sec (%llubps) errors: %llu",
3230                      (unsigned long long)pps,
3231                      (unsigned long long)mbps,
3232                      (unsigned long long)bps,
3233                      (unsigned long long)pkt_dev->errors);
3234 }
3235 
3236 /* Set stopped-at timer, remove from running list, do counters & statistics */
3237 static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
3238 {
3239         int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1;
3240 
3241         if (!pkt_dev->running) {
3242                 pr_warn("interface: %s is already stopped\n",
3243                         pkt_dev->odevname);
3244                 return -EINVAL;
3245         }
3246 
3247         pkt_dev->running = 0;
3248         kfree_skb(pkt_dev->skb);
3249         pkt_dev->skb = NULL;
3250         pkt_dev->stopped_at = ktime_get();
3251 
3252         show_results(pkt_dev, nr_frags);
3253 
3254         return 0;
3255 }
3256 
3257 static struct pktgen_dev *next_to_run(struct pktgen_thread *t)
3258 {
3259         struct pktgen_dev *pkt_dev, *best = NULL;
3260 
3261         rcu_read_lock();
3262         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3263                 if (!pkt_dev->running)
3264                         continue;
3265                 if (best == NULL)
3266                         best = pkt_dev;
3267                 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0)
3268                         best = pkt_dev;
3269         }
3270         rcu_read_unlock();
3271 
3272         return best;
3273 }
3274 
3275 static void pktgen_stop(struct pktgen_thread *t)
3276 {
3277         struct pktgen_dev *pkt_dev;
3278 
3279         func_enter();
3280 
3281         rcu_read_lock();
3282 
3283         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3284                 pktgen_stop_device(pkt_dev);
3285         }
3286 
3287         rcu_read_unlock();
3288 }
3289 
3290 /*
3291  * one of our devices needs to be removed - find it
3292  * and remove it
3293  */
3294 static void pktgen_rem_one_if(struct pktgen_thread *t)
3295 {
3296         struct list_head *q, *n;
3297         struct pktgen_dev *cur;
3298 
3299         func_enter();
3300 
3301         list_for_each_safe(q, n, &t->if_list) {
3302                 cur = list_entry(q, struct pktgen_dev, list);
3303 
3304                 if (!cur->removal_mark)
3305                         continue;
3306 
3307                 kfree_skb(cur->skb);
3308                 cur->skb = NULL;
3309 
3310                 pktgen_remove_device(t, cur);
3311 
3312                 break;
3313         }
3314 }
3315 
3316 static void pktgen_rem_all_ifs(struct pktgen_thread *t)
3317 {
3318         struct list_head *q, *n;
3319         struct pktgen_dev *cur;
3320 
3321         func_enter();
3322 
3323         /* Remove all devices, free mem */
3324 
3325         list_for_each_safe(q, n, &t->if_list) {
3326                 cur = list_entry(q, struct pktgen_dev, list);
3327 
3328                 kfree_skb(cur->skb);
3329                 cur->skb = NULL;
3330 
3331                 pktgen_remove_device(t, cur);
3332         }
3333 }
3334 
3335 static void pktgen_rem_thread(struct pktgen_thread *t)
3336 {
3337         /* Remove from the thread list */
3338         remove_proc_entry(t->tsk->comm, t->net->proc_dir);
3339 }
3340 
3341 static void pktgen_resched(struct pktgen_dev *pkt_dev)
3342 {
3343         ktime_t idle_start = ktime_get();
3344         schedule();
3345         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3346 }
3347 
3348 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
3349 {
3350         ktime_t idle_start = ktime_get();
3351 
3352         while (atomic_read(&(pkt_dev->skb->users)) != 1) {
3353                 if (signal_pending(current))
3354                         break;
3355 
3356                 if (need_resched())
3357                         pktgen_resched(pkt_dev);
3358                 else
3359                         cpu_relax();
3360         }
3361         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3362 }
3363 
3364 static void pktgen_xmit(struct pktgen_dev *pkt_dev)
3365 {
3366         unsigned int burst = ACCESS_ONCE(pkt_dev->burst);
3367         struct net_device *odev = pkt_dev->odev;
3368         struct netdev_queue *txq;
3369         struct sk_buff *skb;
3370         int ret;
3371 
3372         /* If device is offline, then don't send */
3373         if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) {
3374                 pktgen_stop_device(pkt_dev);
3375                 return;
3376         }
3377 
3378         /* This is max DELAY, this has special meaning of
3379          * "never transmit"
3380          */
3381         if (unlikely(pkt_dev->delay == ULLONG_MAX)) {
3382                 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX);
3383                 return;
3384         }
3385 
3386         /* If no skb or clone count exhausted then get new one */
3387         if (!pkt_dev->skb || (pkt_dev->last_ok &&
3388                               ++pkt_dev->clone_count >= pkt_dev->clone_skb)) {
3389                 /* build a new pkt */
3390                 kfree_skb(pkt_dev->skb);
3391 
3392                 pkt_dev->skb = fill_packet(odev, pkt_dev);
3393                 if (pkt_dev->skb == NULL) {
3394                         pr_err("ERROR: couldn't allocate skb in fill_packet\n");
3395                         schedule();
3396                         pkt_dev->clone_count--; /* back out increment, OOM */
3397                         return;
3398                 }
3399                 pkt_dev->last_pkt_size = pkt_dev->skb->len;
3400                 pkt_dev->allocated_skbs++;
3401                 pkt_dev->clone_count = 0;       /* reset counter */
3402         }
3403 
3404         if (pkt_dev->delay && pkt_dev->last_ok)
3405                 spin(pkt_dev, pkt_dev->next_tx);
3406 
3407         if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) {
3408                 skb = pkt_dev->skb;
3409                 skb->protocol = eth_type_trans(skb, skb->dev);
3410                 atomic_add(burst, &skb->users);
3411                 local_bh_disable();
3412                 do {
3413                         ret = netif_receive_skb(skb);
3414                         if (ret == NET_RX_DROP)
3415                                 pkt_dev->errors++;
3416                         pkt_dev->sofar++;
3417                         pkt_dev->seq_num++;
3418                         if (atomic_read(&skb->users) != burst) {
3419                                 /* skb was queued by rps/rfs or taps,
3420                                  * so cannot reuse this skb
3421                                  */
3422                                 atomic_sub(burst - 1, &skb->users);
3423                                 /* get out of the loop and wait
3424                                  * until skb is consumed
3425                                  */
3426                                 break;
3427                         }
3428                         /* skb was 'freed' by stack, so clean few
3429                          * bits and reuse it
3430                          */
3431 #ifdef CONFIG_NET_CLS_ACT
3432                         skb->tc_verd = 0; /* reset reclass/redir ttl */
3433 #endif
3434                 } while (--burst > 0);
3435                 goto out; /* Skips xmit_mode M_START_XMIT */
3436         }
3437 
3438         txq = skb_get_tx_queue(odev, pkt_dev->skb);
3439 
3440         local_bh_disable();
3441 
3442         HARD_TX_LOCK(odev, txq, smp_processor_id());
3443 
3444         if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) {
3445                 ret = NETDEV_TX_BUSY;
3446                 pkt_dev->last_ok = 0;
3447                 goto unlock;
3448         }
3449         atomic_add(burst, &pkt_dev->skb->users);
3450 
3451 xmit_more:
3452         ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0);
3453 
3454         switch (ret) {
3455         case NETDEV_TX_OK:
3456                 pkt_dev->last_ok = 1;
3457                 pkt_dev->sofar++;
3458                 pkt_dev->seq_num++;
3459                 pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3460                 if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq))
3461                         goto xmit_more;
3462                 break;
3463         case NET_XMIT_DROP:
3464         case NET_XMIT_CN:
3465         case NET_XMIT_POLICED:
3466                 /* skb has been consumed */
3467                 pkt_dev->errors++;
3468                 break;
3469         default: /* Drivers are not supposed to return other values! */
3470                 net_info_ratelimited("%s xmit error: %d\n",
3471                                      pkt_dev->odevname, ret);
3472                 pkt_dev->errors++;
3473                 /* fallthru */
3474         case NETDEV_TX_LOCKED:
3475         case NETDEV_TX_BUSY:
3476                 /* Retry it next time */
3477                 atomic_dec(&(pkt_dev->skb->users));
3478                 pkt_dev->last_ok = 0;
3479         }
3480         if (unlikely(burst))
3481                 atomic_sub(burst, &pkt_dev->skb->users);
3482 unlock:
3483         HARD_TX_UNLOCK(odev, txq);
3484 
3485 out:
3486         local_bh_enable();
3487 
3488         /* If pkt_dev->count is zero, then run forever */
3489         if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
3490                 pktgen_wait_for_skb(pkt_dev);
3491 
3492                 /* Done with this */
3493                 pktgen_stop_device(pkt_dev);
3494         }
3495 }
3496 
3497 /*
3498  * Main loop of the thread goes here
3499  */
3500 
3501 static int pktgen_thread_worker(void *arg)
3502 {
3503         DEFINE_WAIT(wait);
3504         struct pktgen_thread *t = arg;
3505         struct pktgen_dev *pkt_dev = NULL;
3506         int cpu = t->cpu;
3507 
3508         BUG_ON(smp_processor_id() != cpu);
3509 
3510         init_waitqueue_head(&t->queue);
3511         complete(&t->start_done);
3512 
3513         pr_debug("starting pktgen/%d:  pid=%d\n", cpu, task_pid_nr(current));
3514 
3515         set_freezable();
3516 
3517         while (!kthread_should_stop()) {
3518                 pkt_dev = next_to_run(t);
3519 
3520                 if (unlikely(!pkt_dev && t->control == 0)) {
3521                         if (t->net->pktgen_exiting)
3522                                 break;
3523                         wait_event_interruptible_timeout(t->queue,
3524                                                          t->control != 0,
3525                                                          HZ/10);
3526                         try_to_freeze();
3527                         continue;
3528                 }
3529 
3530                 if (likely(pkt_dev)) {
3531                         pktgen_xmit(pkt_dev);
3532 
3533                         if (need_resched())
3534                                 pktgen_resched(pkt_dev);
3535                         else
3536                                 cpu_relax();
3537                 }
3538 
3539                 if (t->control & T_STOP) {
3540                         pktgen_stop(t);
3541                         t->control &= ~(T_STOP);
3542                 }
3543 
3544                 if (t->control & T_RUN) {
3545                         pktgen_run(t);
3546                         t->control &= ~(T_RUN);
3547                 }
3548 
3549                 if (t->control & T_REMDEVALL) {
3550                         pktgen_rem_all_ifs(t);
3551                         t->control &= ~(T_REMDEVALL);
3552                 }
3553 
3554                 if (t->control & T_REMDEV) {
3555                         pktgen_rem_one_if(t);
3556                         t->control &= ~(T_REMDEV);
3557                 }
3558 
3559                 try_to_freeze();
3560         }
3561 
3562         pr_debug("%s stopping all device\n", t->tsk->comm);
3563         pktgen_stop(t);
3564 
3565         pr_debug("%s removing all device\n", t->tsk->comm);
3566         pktgen_rem_all_ifs(t);
3567 
3568         pr_debug("%s removing thread\n", t->tsk->comm);
3569         pktgen_rem_thread(t);
3570 
3571         return 0;
3572 }
3573 
3574 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
3575                                           const char *ifname, bool exact)
3576 {
3577         struct pktgen_dev *p, *pkt_dev = NULL;
3578         size_t len = strlen(ifname);
3579 
3580         rcu_read_lock();
3581         list_for_each_entry_rcu(p, &t->if_list, list)
3582                 if (strncmp(p->odevname, ifname, len) == 0) {
3583                         if (p->odevname[len]) {
3584                                 if (exact || p->odevname[len] != '@')
3585                                         continue;
3586                         }
3587                         pkt_dev = p;
3588                         break;
3589                 }
3590 
3591         rcu_read_unlock();
3592         pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev);
3593         return pkt_dev;
3594 }
3595 
3596 /*
3597  * Adds a dev at front of if_list.
3598  */
3599 
3600 static int add_dev_to_thread(struct pktgen_thread *t,
3601                              struct pktgen_dev *pkt_dev)
3602 {
3603         int rv = 0;
3604 
3605         /* This function cannot be called concurrently, as its called
3606          * under pktgen_thread_lock mutex, but it can run from
3607          * userspace on another CPU than the kthread.  The if_lock()
3608          * is used here to sync with concurrent instances of
3609          * _rem_dev_from_if_list() invoked via kthread, which is also
3610          * updating the if_list */
3611         if_lock(t);
3612 
3613         if (pkt_dev->pg_thread) {
3614                 pr_err("ERROR: already assigned to a thread\n");
3615                 rv = -EBUSY;
3616                 goto out;
3617         }
3618 
3619         pkt_dev->running = 0;
3620         pkt_dev->pg_thread = t;
3621         list_add_rcu(&pkt_dev->list, &t->if_list);
3622 
3623 out:
3624         if_unlock(t);
3625         return rv;
3626 }
3627 
3628 /* Called under thread lock */
3629 
3630 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
3631 {
3632         struct pktgen_dev *pkt_dev;
3633         int err;
3634         int node = cpu_to_node(t->cpu);
3635 
3636         /* We don't allow a device to be on several threads */
3637 
3638         pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND);
3639         if (pkt_dev) {
3640                 pr_err("ERROR: interface already used\n");
3641                 return -EBUSY;
3642         }
3643 
3644         pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node);
3645         if (!pkt_dev)
3646                 return -ENOMEM;
3647 
3648         strcpy(pkt_dev->odevname, ifname);
3649         pkt_dev->flows = vzalloc_node(MAX_CFLOWS * sizeof(struct flow_state),
3650                                       node);
3651         if (pkt_dev->flows == NULL) {
3652                 kfree(pkt_dev);
3653                 return -ENOMEM;
3654         }
3655 
3656         pkt_dev->removal_mark = 0;
3657         pkt_dev->nfrags = 0;
3658         pkt_dev->delay = pg_delay_d;
3659         pkt_dev->count = pg_count_d;
3660         pkt_dev->sofar = 0;
3661         pkt_dev->udp_src_min = 9;       /* sink port */
3662         pkt_dev->udp_src_max = 9;
3663         pkt_dev->udp_dst_min = 9;
3664         pkt_dev->udp_dst_max = 9;
3665         pkt_dev->vlan_p = 0;
3666         pkt_dev->vlan_cfi = 0;
3667         pkt_dev->vlan_id = 0xffff;
3668         pkt_dev->svlan_p = 0;
3669         pkt_dev->svlan_cfi = 0;
3670         pkt_dev->svlan_id = 0xffff;
3671         pkt_dev->burst = 1;
3672         pkt_dev->node = -1;
3673 
3674         err = pktgen_setup_dev(t->net, pkt_dev, ifname);
3675         if (err)
3676                 goto out1;
3677         if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)
3678                 pkt_dev->clone_skb = pg_clone_skb_d;
3679 
3680         pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir,
3681                                           &pktgen_if_fops, pkt_dev);
3682         if (!pkt_dev->entry) {
3683                 pr_err("cannot create %s/%s procfs entry\n",
3684                        PG_PROC_DIR, ifname);
3685                 err = -EINVAL;
3686                 goto out2;
3687         }
3688 #ifdef CONFIG_XFRM
3689         pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
3690         pkt_dev->ipsproto = IPPROTO_ESP;
3691 
3692         /* xfrm tunnel mode needs additional dst to extract outter
3693          * ip header protocol/ttl/id field, here creat a phony one.
3694          * instead of looking for a valid rt, which definitely hurting
3695          * performance under such circumstance.
3696          */
3697         pkt_dev->dstops.family = AF_INET;
3698         pkt_dev->dst.dev = pkt_dev->odev;
3699         dst_init_metrics(&pkt_dev->dst, pktgen_dst_metrics, false);
3700         pkt_dev->dst.child = &pkt_dev->dst;
3701         pkt_dev->dst.ops = &pkt_dev->dstops;
3702 #endif
3703 
3704         return add_dev_to_thread(t, pkt_dev);
3705 out2:
3706         dev_put(pkt_dev->odev);
3707 out1:
3708 #ifdef CONFIG_XFRM
3709         free_SAs(pkt_dev);
3710 #endif
3711         vfree(pkt_dev->flows);
3712         kfree(pkt_dev);
3713         return err;
3714 }
3715 
3716 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
3717 {
3718         struct pktgen_thread *t;
3719         struct proc_dir_entry *pe;
3720         struct task_struct *p;
3721 
3722         t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL,
3723                          cpu_to_node(cpu));
3724         if (!t) {
3725                 pr_err("ERROR: out of memory, can't create new thread\n");
3726                 return -ENOMEM;
3727         }
3728 
3729         spin_lock_init(&t->if_lock);
3730         t->cpu = cpu;
3731 
3732         INIT_LIST_HEAD(&t->if_list);
3733 
3734         list_add_tail(&t->th_list, &pn->pktgen_threads);
3735         init_completion(&t->start_done);
3736 
3737         p = kthread_create_on_node(pktgen_thread_worker,
3738                                    t,
3739                                    cpu_to_node(cpu),
3740                                    "kpktgend_%d", cpu);
3741         if (IS_ERR(p)) {
3742                 pr_err("kernel_thread() failed for cpu %d\n", t->cpu);
3743                 list_del(&t->th_list);
3744                 kfree(t);
3745                 return PTR_ERR(p);
3746         }
3747         kthread_bind(p, cpu);
3748         t->tsk = p;
3749 
3750         pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir,
3751                               &pktgen_thread_fops, t);
3752         if (!pe) {
3753                 pr_err("cannot create %s/%s procfs entry\n",
3754                        PG_PROC_DIR, t->tsk->comm);
3755                 kthread_stop(p);
3756                 list_del(&t->th_list);
3757                 kfree(t);
3758                 return -EINVAL;
3759         }
3760 
3761         t->net = pn;
3762         get_task_struct(p);
3763         wake_up_process(p);
3764         wait_for_completion(&t->start_done);
3765 
3766         return 0;
3767 }
3768 
3769 /*
3770  * Removes a device from the thread if_list.
3771  */
3772 static void _rem_dev_from_if_list(struct pktgen_thread *t,
3773                                   struct pktgen_dev *pkt_dev)
3774 {
3775         struct list_head *q, *n;
3776         struct pktgen_dev *p;
3777 
3778         if_lock(t);
3779         list_for_each_safe(q, n, &t->if_list) {
3780                 p = list_entry(q, struct pktgen_dev, list);
3781                 if (p == pkt_dev)
3782                         list_del_rcu(&p->list);
3783         }
3784         if_unlock(t);
3785 }
3786 
3787 static int pktgen_remove_device(struct pktgen_thread *t,
3788                                 struct pktgen_dev *pkt_dev)
3789 {
3790         pr_debug("remove_device pkt_dev=%p\n", pkt_dev);
3791 
3792         if (pkt_dev->running) {
3793                 pr_warn("WARNING: trying to remove a running interface, stopping it now\n");
3794                 pktgen_stop_device(pkt_dev);
3795         }
3796 
3797         /* Dis-associate from the interface */
3798 
3799         if (pkt_dev->odev) {
3800                 dev_put(pkt_dev->odev);
3801                 pkt_dev->odev = NULL;
3802         }
3803 
3804         /* Remove proc before if_list entry, because add_device uses
3805          * list to determine if interface already exist, avoid race
3806          * with proc_create_data() */
3807         proc_remove(pkt_dev->entry);
3808 
3809         /* And update the thread if_list */
3810         _rem_dev_from_if_list(t, pkt_dev);
3811 
3812 #ifdef CONFIG_XFRM
3813         free_SAs(pkt_dev);
3814 #endif
3815         vfree(pkt_dev->flows);
3816         if (pkt_dev->page)
3817                 put_page(pkt_dev->page);
3818         kfree_rcu(pkt_dev, rcu);
3819         return 0;
3820 }
3821 
3822 static int __net_init pg_net_init(struct net *net)
3823 {
3824         struct pktgen_net *pn = net_generic(net, pg_net_id);
3825         struct proc_dir_entry *pe;
3826         int cpu, ret = 0;
3827 
3828         pn->net = net;
3829         INIT_LIST_HEAD(&pn->pktgen_threads);
3830         pn->pktgen_exiting = false;
3831         pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net);
3832         if (!pn->proc_dir) {
3833                 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR);
3834                 return -ENODEV;
3835         }
3836         pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_fops);
3837         if (pe == NULL) {
3838                 pr_err("cannot create %s procfs entry\n", PGCTRL);
3839                 ret = -EINVAL;
3840                 goto remove;
3841         }
3842 
3843         for_each_online_cpu(cpu) {
3844                 int err;
3845 
3846                 err = pktgen_create_thread(cpu, pn);
3847                 if (err)
3848                         pr_warn("Cannot create thread for cpu %d (%d)\n",
3849                                    cpu, err);
3850         }
3851 
3852         if (list_empty(&pn->pktgen_threads)) {
3853                 pr_err("Initialization failed for all threads\n");
3854                 ret = -ENODEV;
3855                 goto remove_entry;
3856         }
3857 
3858         return 0;
3859 
3860 remove_entry:
3861         remove_proc_entry(PGCTRL, pn->proc_dir);
3862 remove:
3863         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3864         return ret;
3865 }
3866 
3867 static void __net_exit pg_net_exit(struct net *net)
3868 {
3869         struct pktgen_net *pn = net_generic(net, pg_net_id);
3870         struct pktgen_thread *t;
3871         struct list_head *q, *n;
3872         LIST_HEAD(list);
3873 
3874         /* Stop all interfaces & threads */
3875         pn->pktgen_exiting = true;
3876 
3877         mutex_lock(&pktgen_thread_lock);
3878         list_splice_init(&pn->pktgen_threads, &list);
3879         mutex_unlock(&pktgen_thread_lock);
3880 
3881         list_for_each_safe(q, n, &list) {
3882                 t = list_entry(q, struct pktgen_thread, th_list);
3883                 list_del(&t->th_list);
3884                 kthread_stop(t->tsk);
3885                 put_task_struct(t->tsk);
3886                 kfree(t);
3887         }
3888 
3889         remove_proc_entry(PGCTRL, pn->proc_dir);
3890         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3891 }
3892 
3893 static struct pernet_operations pg_net_ops = {
3894         .init = pg_net_init,
3895         .exit = pg_net_exit,
3896         .id   = &pg_net_id,
3897         .size = sizeof(struct pktgen_net),
3898 };
3899 
3900 static int __init pg_init(void)
3901 {
3902         int ret = 0;
3903 
3904         pr_info("%s", version);
3905         ret = register_pernet_subsys(&pg_net_ops);
3906         if (ret)
3907                 return ret;
3908         ret = register_netdevice_notifier(&pktgen_notifier_block);
3909         if (ret)
3910                 unregister_pernet_subsys(&pg_net_ops);
3911 
3912         return ret;
3913 }
3914 
3915 static void __exit pg_cleanup(void)
3916 {
3917         unregister_netdevice_notifier(&pktgen_notifier_block);
3918         unregister_pernet_subsys(&pg_net_ops);
3919         /* Don't need rcu_barrier() due to use of kfree_rcu() */
3920 }
3921 
3922 module_init(pg_init);
3923 module_exit(pg_cleanup);
3924 
3925 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
3926 MODULE_DESCRIPTION("Packet Generator tool");
3927 MODULE_LICENSE("GPL");
3928 MODULE_VERSION(VERSION);
3929 module_param(pg_count_d, int, 0);
3930 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
3931 module_param(pg_delay_d, int, 0);
3932 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
3933 module_param(pg_clone_skb_d, int, 0);
3934 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
3935 module_param(debug, int, 0);
3936 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");
3937 

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