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Linux/net/core/pktgen.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * Authors:
  4  * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
  5  *                             Uppsala University and
  6  *                             Swedish University of Agricultural Sciences
  7  *
  8  * Alexey Kuznetsov  <kuznet@ms2.inr.ac.ru>
  9  * Ben Greear <greearb@candelatech.com>
 10  * Jens Låås <jens.laas@data.slu.se>
 11  *
 12  * A tool for loading the network with preconfigurated packets.
 13  * The tool is implemented as a linux module.  Parameters are output
 14  * device, delay (to hard_xmit), number of packets, and whether
 15  * to use multiple SKBs or just the same one.
 16  * pktgen uses the installed interface's output routine.
 17  *
 18  * Additional hacking by:
 19  *
 20  * Jens.Laas@data.slu.se
 21  * Improved by ANK. 010120.
 22  * Improved by ANK even more. 010212.
 23  * MAC address typo fixed. 010417 --ro
 24  * Integrated.  020301 --DaveM
 25  * Added multiskb option 020301 --DaveM
 26  * Scaling of results. 020417--sigurdur@linpro.no
 27  * Significant re-work of the module:
 28  *   *  Convert to threaded model to more efficiently be able to transmit
 29  *       and receive on multiple interfaces at once.
 30  *   *  Converted many counters to __u64 to allow longer runs.
 31  *   *  Allow configuration of ranges, like min/max IP address, MACs,
 32  *       and UDP-ports, for both source and destination, and can
 33  *       set to use a random distribution or sequentially walk the range.
 34  *   *  Can now change most values after starting.
 35  *   *  Place 12-byte packet in UDP payload with magic number,
 36  *       sequence number, and timestamp.
 37  *   *  Add receiver code that detects dropped pkts, re-ordered pkts, and
 38  *       latencies (with micro-second) precision.
 39  *   *  Add IOCTL interface to easily get counters & configuration.
 40  *   --Ben Greear <greearb@candelatech.com>
 41  *
 42  * Renamed multiskb to clone_skb and cleaned up sending core for two distinct
 43  * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
 44  * as a "fastpath" with a configurable number of clones after alloc's.
 45  * clone_skb=0 means all packets are allocated this also means ranges time
 46  * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100
 47  * clones.
 48  *
 49  * Also moved to /proc/net/pktgen/
 50  * --ro
 51  *
 52  * Sept 10:  Fixed threading/locking.  Lots of bone-headed and more clever
 53  *    mistakes.  Also merged in DaveM's patch in the -pre6 patch.
 54  * --Ben Greear <greearb@candelatech.com>
 55  *
 56  * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
 57  *
 58  * 021124 Finished major redesign and rewrite for new functionality.
 59  * See Documentation/networking/pktgen.txt for how to use this.
 60  *
 61  * The new operation:
 62  * For each CPU one thread/process is created at start. This process checks
 63  * for running devices in the if_list and sends packets until count is 0 it
 64  * also the thread checks the thread->control which is used for inter-process
 65  * communication. controlling process "posts" operations to the threads this
 66  * way.
 67  * The if_list is RCU protected, and the if_lock remains to protect updating
 68  * of if_list, from "add_device" as it invoked from userspace (via proc write).
 69  *
 70  * By design there should only be *one* "controlling" process. In practice
 71  * multiple write accesses gives unpredictable result. Understood by "write"
 72  * to /proc gives result code thats should be read be the "writer".
 73  * For practical use this should be no problem.
 74  *
 75  * Note when adding devices to a specific CPU there good idea to also assign
 76  * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
 77  * --ro
 78  *
 79  * Fix refcount off by one if first packet fails, potential null deref,
 80  * memleak 030710- KJP
 81  *
 82  * First "ranges" functionality for ipv6 030726 --ro
 83  *
 84  * Included flow support. 030802 ANK.
 85  *
 86  * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org>
 87  *
 88  * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
 89  * ia64 compilation fix from  Aron Griffis <aron@hp.com> 040604
 90  *
 91  * New xmit() return, do_div and misc clean up by Stephen Hemminger
 92  * <shemminger@osdl.org> 040923
 93  *
 94  * Randy Dunlap fixed u64 printk compiler warning
 95  *
 96  * Remove FCS from BW calculation.  Lennert Buytenhek <buytenh@wantstofly.org>
 97  * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
 98  *
 99  * Corrections from Nikolai Malykh (nmalykh@bilim.com)
100  * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
101  *
102  * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
103  * 050103
104  *
105  * MPLS support by Steven Whitehouse <steve@chygwyn.com>
106  *
107  * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com>
108  *
109  * Fixed src_mac command to set source mac of packet to value specified in
110  * command by Adit Ranadive <adit.262@gmail.com>
111  */
112 
113 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
114 
115 #include <linux/sys.h>
116 #include <linux/types.h>
117 #include <linux/module.h>
118 #include <linux/moduleparam.h>
119 #include <linux/kernel.h>
120 #include <linux/mutex.h>
121 #include <linux/sched.h>
122 #include <linux/slab.h>
123 #include <linux/vmalloc.h>
124 #include <linux/unistd.h>
125 #include <linux/string.h>
126 #include <linux/ptrace.h>
127 #include <linux/errno.h>
128 #include <linux/ioport.h>
129 #include <linux/interrupt.h>
130 #include <linux/capability.h>
131 #include <linux/hrtimer.h>
132 #include <linux/freezer.h>
133 #include <linux/delay.h>
134 #include <linux/timer.h>
135 #include <linux/list.h>
136 #include <linux/init.h>
137 #include <linux/skbuff.h>
138 #include <linux/netdevice.h>
139 #include <linux/inet.h>
140 #include <linux/inetdevice.h>
141 #include <linux/rtnetlink.h>
142 #include <linux/if_arp.h>
143 #include <linux/if_vlan.h>
144 #include <linux/in.h>
145 #include <linux/ip.h>
146 #include <linux/ipv6.h>
147 #include <linux/udp.h>
148 #include <linux/proc_fs.h>
149 #include <linux/seq_file.h>
150 #include <linux/wait.h>
151 #include <linux/etherdevice.h>
152 #include <linux/kthread.h>
153 #include <linux/prefetch.h>
154 #include <linux/mmzone.h>
155 #include <net/net_namespace.h>
156 #include <net/checksum.h>
157 #include <net/ipv6.h>
158 #include <net/udp.h>
159 #include <net/ip6_checksum.h>
160 #include <net/addrconf.h>
161 #ifdef CONFIG_XFRM
162 #include <net/xfrm.h>
163 #endif
164 #include <net/netns/generic.h>
165 #include <asm/byteorder.h>
166 #include <linux/rcupdate.h>
167 #include <linux/bitops.h>
168 #include <linux/io.h>
169 #include <linux/timex.h>
170 #include <linux/uaccess.h>
171 #include <asm/dma.h>
172 #include <asm/div64.h>          /* do_div */
173 
174 #define VERSION "2.75"
175 #define IP_NAME_SZ 32
176 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */
177 #define MPLS_STACK_BOTTOM htonl(0x00000100)
178 
179 #define func_enter() pr_debug("entering %s\n", __func__);
180 
181 #define PKT_FLAGS                                                       \
182         pf(IPV6)                /* Interface in IPV6 Mode */            \
183         pf(IPSRC_RND)           /* IP-Src Random  */                    \
184         pf(IPDST_RND)           /* IP-Dst Random  */                    \
185         pf(TXSIZE_RND)          /* Transmit size is random */           \
186         pf(UDPSRC_RND)          /* UDP-Src Random */                    \
187         pf(UDPDST_RND)          /* UDP-Dst Random */                    \
188         pf(UDPCSUM)             /* Include UDP checksum */              \
189         pf(NO_TIMESTAMP)        /* Don't timestamp packets (default TS) */ \
190         pf(MPLS_RND)            /* Random MPLS labels */                \
191         pf(QUEUE_MAP_RND)       /* queue map Random */                  \
192         pf(QUEUE_MAP_CPU)       /* queue map mirrors smp_processor_id() */ \
193         pf(FLOW_SEQ)            /* Sequential flows */                  \
194         pf(IPSEC)               /* ipsec on for flows */                \
195         pf(MACSRC_RND)          /* MAC-Src Random */                    \
196         pf(MACDST_RND)          /* MAC-Dst Random */                    \
197         pf(VID_RND)             /* Random VLAN ID */                    \
198         pf(SVID_RND)            /* Random SVLAN ID */                   \
199         pf(NODE)                /* Node memory alloc*/                  \
200 
201 #define pf(flag)                flag##_SHIFT,
202 enum pkt_flags {
203         PKT_FLAGS
204 };
205 #undef pf
206 
207 /* Device flag bits */
208 #define pf(flag)                static const __u32 F_##flag = (1<<flag##_SHIFT);
209 PKT_FLAGS
210 #undef pf
211 
212 #define pf(flag)                __stringify(flag),
213 static char *pkt_flag_names[] = {
214         PKT_FLAGS
215 };
216 #undef pf
217 
218 #define NR_PKT_FLAGS            ARRAY_SIZE(pkt_flag_names)
219 
220 /* Thread control flag bits */
221 #define T_STOP        (1<<0)    /* Stop run */
222 #define T_RUN         (1<<1)    /* Start run */
223 #define T_REMDEVALL   (1<<2)    /* Remove all devs */
224 #define T_REMDEV      (1<<3)    /* Remove one dev */
225 
226 /* Xmit modes */
227 #define M_START_XMIT            0       /* Default normal TX */
228 #define M_NETIF_RECEIVE         1       /* Inject packets into stack */
229 #define M_QUEUE_XMIT            2       /* Inject packet into qdisc */
230 
231 /* If lock -- protects updating of if_list */
232 #define   if_lock(t)           mutex_lock(&(t->if_lock));
233 #define   if_unlock(t)           mutex_unlock(&(t->if_lock));
234 
235 /* Used to help with determining the pkts on receive */
236 #define PKTGEN_MAGIC 0xbe9be955
237 #define PG_PROC_DIR "pktgen"
238 #define PGCTRL      "pgctrl"
239 
240 #define MAX_CFLOWS  65536
241 
242 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4)
243 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4)
244 
245 struct flow_state {
246         __be32 cur_daddr;
247         int count;
248 #ifdef CONFIG_XFRM
249         struct xfrm_state *x;
250 #endif
251         __u32 flags;
252 };
253 
254 /* flow flag bits */
255 #define F_INIT   (1<<0)         /* flow has been initialized */
256 
257 struct pktgen_dev {
258         /*
259          * Try to keep frequent/infrequent used vars. separated.
260          */
261         struct proc_dir_entry *entry;   /* proc file */
262         struct pktgen_thread *pg_thread;/* the owner */
263         struct list_head list;          /* chaining in the thread's run-queue */
264         struct rcu_head  rcu;           /* freed by RCU */
265 
266         int running;            /* if false, the test will stop */
267 
268         /* If min != max, then we will either do a linear iteration, or
269          * we will do a random selection from within the range.
270          */
271         __u32 flags;
272         int xmit_mode;
273         int min_pkt_size;
274         int max_pkt_size;
275         int pkt_overhead;       /* overhead for MPLS, VLANs, IPSEC etc */
276         int nfrags;
277         int removal_mark;       /* non-zero => the device is marked for
278                                  * removal by worker thread */
279 
280         struct page *page;
281         u64 delay;              /* nano-seconds */
282 
283         __u64 count;            /* Default No packets to send */
284         __u64 sofar;            /* How many pkts we've sent so far */
285         __u64 tx_bytes;         /* How many bytes we've transmitted */
286         __u64 errors;           /* Errors when trying to transmit, */
287 
288         /* runtime counters relating to clone_skb */
289 
290         __u32 clone_count;
291         int last_ok;            /* Was last skb sent?
292                                  * Or a failed transmit of some sort?
293                                  * This will keep sequence numbers in order
294                                  */
295         ktime_t next_tx;
296         ktime_t started_at;
297         ktime_t stopped_at;
298         u64     idle_acc;       /* nano-seconds */
299 
300         __u32 seq_num;
301 
302         int clone_skb;          /*
303                                  * Use multiple SKBs during packet gen.
304                                  * If this number is greater than 1, then
305                                  * that many copies of the same packet will be
306                                  * sent before a new packet is allocated.
307                                  * If you want to send 1024 identical packets
308                                  * before creating a new packet,
309                                  * set clone_skb to 1024.
310                                  */
311 
312         char dst_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
313         char dst_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
314         char src_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
315         char src_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
316 
317         struct in6_addr in6_saddr;
318         struct in6_addr in6_daddr;
319         struct in6_addr cur_in6_daddr;
320         struct in6_addr cur_in6_saddr;
321         /* For ranges */
322         struct in6_addr min_in6_daddr;
323         struct in6_addr max_in6_daddr;
324         struct in6_addr min_in6_saddr;
325         struct in6_addr max_in6_saddr;
326 
327         /* If we're doing ranges, random or incremental, then this
328          * defines the min/max for those ranges.
329          */
330         __be32 saddr_min;       /* inclusive, source IP address */
331         __be32 saddr_max;       /* exclusive, source IP address */
332         __be32 daddr_min;       /* inclusive, dest IP address */
333         __be32 daddr_max;       /* exclusive, dest IP address */
334 
335         __u16 udp_src_min;      /* inclusive, source UDP port */
336         __u16 udp_src_max;      /* exclusive, source UDP port */
337         __u16 udp_dst_min;      /* inclusive, dest UDP port */
338         __u16 udp_dst_max;      /* exclusive, dest UDP port */
339 
340         /* DSCP + ECN */
341         __u8 tos;            /* six MSB of (former) IPv4 TOS
342                                 are for dscp codepoint */
343         __u8 traffic_class;  /* ditto for the (former) Traffic Class in IPv6
344                                 (see RFC 3260, sec. 4) */
345 
346         /* MPLS */
347         unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */
348         __be32 labels[MAX_MPLS_LABELS];
349 
350         /* VLAN/SVLAN (802.1Q/Q-in-Q) */
351         __u8  vlan_p;
352         __u8  vlan_cfi;
353         __u16 vlan_id;  /* 0xffff means no vlan tag */
354 
355         __u8  svlan_p;
356         __u8  svlan_cfi;
357         __u16 svlan_id; /* 0xffff means no svlan tag */
358 
359         __u32 src_mac_count;    /* How many MACs to iterate through */
360         __u32 dst_mac_count;    /* How many MACs to iterate through */
361 
362         unsigned char dst_mac[ETH_ALEN];
363         unsigned char src_mac[ETH_ALEN];
364 
365         __u32 cur_dst_mac_offset;
366         __u32 cur_src_mac_offset;
367         __be32 cur_saddr;
368         __be32 cur_daddr;
369         __u16 ip_id;
370         __u16 cur_udp_dst;
371         __u16 cur_udp_src;
372         __u16 cur_queue_map;
373         __u32 cur_pkt_size;
374         __u32 last_pkt_size;
375 
376         __u8 hh[14];
377         /* = {
378            0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,
379 
380            We fill in SRC address later
381            0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
382            0x08, 0x00
383            };
384          */
385         __u16 pad;              /* pad out the hh struct to an even 16 bytes */
386 
387         struct sk_buff *skb;    /* skb we are to transmit next, used for when we
388                                  * are transmitting the same one multiple times
389                                  */
390         struct net_device *odev; /* The out-going device.
391                                   * Note that the device should have it's
392                                   * pg_info pointer pointing back to this
393                                   * device.
394                                   * Set when the user specifies the out-going
395                                   * device name (not when the inject is
396                                   * started as it used to do.)
397                                   */
398         char odevname[32];
399         struct flow_state *flows;
400         unsigned int cflows;    /* Concurrent flows (config) */
401         unsigned int lflow;             /* Flow length  (config) */
402         unsigned int nflows;    /* accumulated flows (stats) */
403         unsigned int curfl;             /* current sequenced flow (state)*/
404 
405         u16 queue_map_min;
406         u16 queue_map_max;
407         __u32 skb_priority;     /* skb priority field */
408         unsigned int burst;     /* number of duplicated packets to burst */
409         int node;               /* Memory node */
410 
411 #ifdef CONFIG_XFRM
412         __u8    ipsmode;                /* IPSEC mode (config) */
413         __u8    ipsproto;               /* IPSEC type (config) */
414         __u32   spi;
415         struct xfrm_dst xdst;
416         struct dst_ops dstops;
417 #endif
418         char result[512];
419 };
420 
421 struct pktgen_hdr {
422         __be32 pgh_magic;
423         __be32 seq_num;
424         __be32 tv_sec;
425         __be32 tv_usec;
426 };
427 
428 
429 static unsigned int pg_net_id __read_mostly;
430 
431 struct pktgen_net {
432         struct net              *net;
433         struct proc_dir_entry   *proc_dir;
434         struct list_head        pktgen_threads;
435         bool                    pktgen_exiting;
436 };
437 
438 struct pktgen_thread {
439         struct mutex if_lock;           /* for list of devices */
440         struct list_head if_list;       /* All device here */
441         struct list_head th_list;
442         struct task_struct *tsk;
443         char result[512];
444 
445         /* Field for thread to receive "posted" events terminate,
446            stop ifs etc. */
447 
448         u32 control;
449         int cpu;
450 
451         wait_queue_head_t queue;
452         struct completion start_done;
453         struct pktgen_net *net;
454 };
455 
456 #define REMOVE 1
457 #define FIND   0
458 
459 static const char version[] =
460         "Packet Generator for packet performance testing. "
461         "Version: " VERSION "\n";
462 
463 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
464 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
465 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
466                                           const char *ifname, bool exact);
467 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
468 static void pktgen_run_all_threads(struct pktgen_net *pn);
469 static void pktgen_reset_all_threads(struct pktgen_net *pn);
470 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn);
471 
472 static void pktgen_stop(struct pktgen_thread *t);
473 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);
474 
475 /* Module parameters, defaults. */
476 static int pg_count_d __read_mostly = 1000;
477 static int pg_delay_d __read_mostly;
478 static int pg_clone_skb_d  __read_mostly;
479 static int debug  __read_mostly;
480 
481 static DEFINE_MUTEX(pktgen_thread_lock);
482 
483 static struct notifier_block pktgen_notifier_block = {
484         .notifier_call = pktgen_device_event,
485 };
486 
487 /*
488  * /proc handling functions
489  *
490  */
491 
492 static int pgctrl_show(struct seq_file *seq, void *v)
493 {
494         seq_puts(seq, version);
495         return 0;
496 }
497 
498 static ssize_t pgctrl_write(struct file *file, const char __user *buf,
499                             size_t count, loff_t *ppos)
500 {
501         char data[128];
502         struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id);
503 
504         if (!capable(CAP_NET_ADMIN))
505                 return -EPERM;
506 
507         if (count == 0)
508                 return -EINVAL;
509 
510         if (count > sizeof(data))
511                 count = sizeof(data);
512 
513         if (copy_from_user(data, buf, count))
514                 return -EFAULT;
515 
516         data[count - 1] = 0;    /* Strip trailing '\n' and terminate string */
517 
518         if (!strcmp(data, "stop"))
519                 pktgen_stop_all_threads_ifs(pn);
520 
521         else if (!strcmp(data, "start"))
522                 pktgen_run_all_threads(pn);
523 
524         else if (!strcmp(data, "reset"))
525                 pktgen_reset_all_threads(pn);
526 
527         else
528                 return -EINVAL;
529 
530         return count;
531 }
532 
533 static int pgctrl_open(struct inode *inode, struct file *file)
534 {
535         return single_open(file, pgctrl_show, PDE_DATA(inode));
536 }
537 
538 static const struct file_operations pktgen_fops = {
539         .open    = pgctrl_open,
540         .read    = seq_read,
541         .llseek  = seq_lseek,
542         .write   = pgctrl_write,
543         .release = single_release,
544 };
545 
546 static int pktgen_if_show(struct seq_file *seq, void *v)
547 {
548         const struct pktgen_dev *pkt_dev = seq->private;
549         ktime_t stopped;
550         unsigned int i;
551         u64 idle;
552 
553         seq_printf(seq,
554                    "Params: count %llu  min_pkt_size: %u  max_pkt_size: %u\n",
555                    (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size,
556                    pkt_dev->max_pkt_size);
557 
558         seq_printf(seq,
559                    "     frags: %d  delay: %llu  clone_skb: %d  ifname: %s\n",
560                    pkt_dev->nfrags, (unsigned long long) pkt_dev->delay,
561                    pkt_dev->clone_skb, pkt_dev->odevname);
562 
563         seq_printf(seq, "     flows: %u flowlen: %u\n", pkt_dev->cflows,
564                    pkt_dev->lflow);
565 
566         seq_printf(seq,
567                    "     queue_map_min: %u  queue_map_max: %u\n",
568                    pkt_dev->queue_map_min,
569                    pkt_dev->queue_map_max);
570 
571         if (pkt_dev->skb_priority)
572                 seq_printf(seq, "     skb_priority: %u\n",
573                            pkt_dev->skb_priority);
574 
575         if (pkt_dev->flags & F_IPV6) {
576                 seq_printf(seq,
577                            "     saddr: %pI6c  min_saddr: %pI6c  max_saddr: %pI6c\n"
578                            "     daddr: %pI6c  min_daddr: %pI6c  max_daddr: %pI6c\n",
579                            &pkt_dev->in6_saddr,
580                            &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr,
581                            &pkt_dev->in6_daddr,
582                            &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr);
583         } else {
584                 seq_printf(seq,
585                            "     dst_min: %s  dst_max: %s\n",
586                            pkt_dev->dst_min, pkt_dev->dst_max);
587                 seq_printf(seq,
588                            "     src_min: %s  src_max: %s\n",
589                            pkt_dev->src_min, pkt_dev->src_max);
590         }
591 
592         seq_puts(seq, "     src_mac: ");
593 
594         seq_printf(seq, "%pM ",
595                    is_zero_ether_addr(pkt_dev->src_mac) ?
596                              pkt_dev->odev->dev_addr : pkt_dev->src_mac);
597 
598         seq_puts(seq, "dst_mac: ");
599         seq_printf(seq, "%pM\n", pkt_dev->dst_mac);
600 
601         seq_printf(seq,
602                    "     udp_src_min: %d  udp_src_max: %d"
603                    "  udp_dst_min: %d  udp_dst_max: %d\n",
604                    pkt_dev->udp_src_min, pkt_dev->udp_src_max,
605                    pkt_dev->udp_dst_min, pkt_dev->udp_dst_max);
606 
607         seq_printf(seq,
608                    "     src_mac_count: %d  dst_mac_count: %d\n",
609                    pkt_dev->src_mac_count, pkt_dev->dst_mac_count);
610 
611         if (pkt_dev->nr_labels) {
612                 seq_puts(seq, "     mpls: ");
613                 for (i = 0; i < pkt_dev->nr_labels; i++)
614                         seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]),
615                                    i == pkt_dev->nr_labels-1 ? "\n" : ", ");
616         }
617 
618         if (pkt_dev->vlan_id != 0xffff)
619                 seq_printf(seq, "     vlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
620                            pkt_dev->vlan_id, pkt_dev->vlan_p,
621                            pkt_dev->vlan_cfi);
622 
623         if (pkt_dev->svlan_id != 0xffff)
624                 seq_printf(seq, "     svlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
625                            pkt_dev->svlan_id, pkt_dev->svlan_p,
626                            pkt_dev->svlan_cfi);
627 
628         if (pkt_dev->tos)
629                 seq_printf(seq, "     tos: 0x%02x\n", pkt_dev->tos);
630 
631         if (pkt_dev->traffic_class)
632                 seq_printf(seq, "     traffic_class: 0x%02x\n", pkt_dev->traffic_class);
633 
634         if (pkt_dev->burst > 1)
635                 seq_printf(seq, "     burst: %d\n", pkt_dev->burst);
636 
637         if (pkt_dev->node >= 0)
638                 seq_printf(seq, "     node: %d\n", pkt_dev->node);
639 
640         if (pkt_dev->xmit_mode == M_NETIF_RECEIVE)
641                 seq_puts(seq, "     xmit_mode: netif_receive\n");
642         else if (pkt_dev->xmit_mode == M_QUEUE_XMIT)
643                 seq_puts(seq, "     xmit_mode: xmit_queue\n");
644 
645         seq_puts(seq, "     Flags: ");
646 
647         for (i = 0; i < NR_PKT_FLAGS; i++) {
648                 if (i == F_FLOW_SEQ)
649                         if (!pkt_dev->cflows)
650                                 continue;
651 
652                 if (pkt_dev->flags & (1 << i))
653                         seq_printf(seq, "%s  ", pkt_flag_names[i]);
654                 else if (i == F_FLOW_SEQ)
655                         seq_puts(seq, "FLOW_RND  ");
656 
657 #ifdef CONFIG_XFRM
658                 if (i == F_IPSEC && pkt_dev->spi)
659                         seq_printf(seq, "spi:%u", pkt_dev->spi);
660 #endif
661         }
662 
663         seq_puts(seq, "\n");
664 
665         /* not really stopped, more like last-running-at */
666         stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at;
667         idle = pkt_dev->idle_acc;
668         do_div(idle, NSEC_PER_USEC);
669 
670         seq_printf(seq,
671                    "Current:\n     pkts-sofar: %llu  errors: %llu\n",
672                    (unsigned long long)pkt_dev->sofar,
673                    (unsigned long long)pkt_dev->errors);
674 
675         seq_printf(seq,
676                    "     started: %lluus  stopped: %lluus idle: %lluus\n",
677                    (unsigned long long) ktime_to_us(pkt_dev->started_at),
678                    (unsigned long long) ktime_to_us(stopped),
679                    (unsigned long long) idle);
680 
681         seq_printf(seq,
682                    "     seq_num: %d  cur_dst_mac_offset: %d  cur_src_mac_offset: %d\n",
683                    pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset,
684                    pkt_dev->cur_src_mac_offset);
685 
686         if (pkt_dev->flags & F_IPV6) {
687                 seq_printf(seq, "     cur_saddr: %pI6c  cur_daddr: %pI6c\n",
688                                 &pkt_dev->cur_in6_saddr,
689                                 &pkt_dev->cur_in6_daddr);
690         } else
691                 seq_printf(seq, "     cur_saddr: %pI4  cur_daddr: %pI4\n",
692                            &pkt_dev->cur_saddr, &pkt_dev->cur_daddr);
693 
694         seq_printf(seq, "     cur_udp_dst: %d  cur_udp_src: %d\n",
695                    pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);
696 
697         seq_printf(seq, "     cur_queue_map: %u\n", pkt_dev->cur_queue_map);
698 
699         seq_printf(seq, "     flows: %u\n", pkt_dev->nflows);
700 
701         if (pkt_dev->result[0])
702                 seq_printf(seq, "Result: %s\n", pkt_dev->result);
703         else
704                 seq_puts(seq, "Result: Idle\n");
705 
706         return 0;
707 }
708 
709 
710 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
711                      __u32 *num)
712 {
713         int i = 0;
714         *num = 0;
715 
716         for (; i < maxlen; i++) {
717                 int value;
718                 char c;
719                 *num <<= 4;
720                 if (get_user(c, &user_buffer[i]))
721                         return -EFAULT;
722                 value = hex_to_bin(c);
723                 if (value >= 0)
724                         *num |= value;
725                 else
726                         break;
727         }
728         return i;
729 }
730 
731 static int count_trail_chars(const char __user * user_buffer,
732                              unsigned int maxlen)
733 {
734         int i;
735 
736         for (i = 0; i < maxlen; i++) {
737                 char c;
738                 if (get_user(c, &user_buffer[i]))
739                         return -EFAULT;
740                 switch (c) {
741                 case '\"':
742                 case '\n':
743                 case '\r':
744                 case '\t':
745                 case ' ':
746                 case '=':
747                         break;
748                 default:
749                         goto done;
750                 }
751         }
752 done:
753         return i;
754 }
755 
756 static long num_arg(const char __user *user_buffer, unsigned long maxlen,
757                                 unsigned long *num)
758 {
759         int i;
760         *num = 0;
761 
762         for (i = 0; i < maxlen; i++) {
763                 char c;
764                 if (get_user(c, &user_buffer[i]))
765                         return -EFAULT;
766                 if ((c >= '') && (c <= '9')) {
767                         *num *= 10;
768                         *num += c - '';
769                 } else
770                         break;
771         }
772         return i;
773 }
774 
775 static int strn_len(const char __user * user_buffer, unsigned int maxlen)
776 {
777         int i;
778 
779         for (i = 0; i < maxlen; i++) {
780                 char c;
781                 if (get_user(c, &user_buffer[i]))
782                         return -EFAULT;
783                 switch (c) {
784                 case '\"':
785                 case '\n':
786                 case '\r':
787                 case '\t':
788                 case ' ':
789                         goto done_str;
790                 default:
791                         break;
792                 }
793         }
794 done_str:
795         return i;
796 }
797 
798 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
799 {
800         unsigned int n = 0;
801         char c;
802         ssize_t i = 0;
803         int len;
804 
805         pkt_dev->nr_labels = 0;
806         do {
807                 __u32 tmp;
808                 len = hex32_arg(&buffer[i], 8, &tmp);
809                 if (len <= 0)
810                         return len;
811                 pkt_dev->labels[n] = htonl(tmp);
812                 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
813                         pkt_dev->flags |= F_MPLS_RND;
814                 i += len;
815                 if (get_user(c, &buffer[i]))
816                         return -EFAULT;
817                 i++;
818                 n++;
819                 if (n >= MAX_MPLS_LABELS)
820                         return -E2BIG;
821         } while (c == ',');
822 
823         pkt_dev->nr_labels = n;
824         return i;
825 }
826 
827 static __u32 pktgen_read_flag(const char *f, bool *disable)
828 {
829         __u32 i;
830 
831         if (f[0] == '!') {
832                 *disable = true;
833                 f++;
834         }
835 
836         for (i = 0; i < NR_PKT_FLAGS; i++) {
837                 if (!IS_ENABLED(CONFIG_XFRM) && i == IPSEC_SHIFT)
838                         continue;
839 
840                 /* allow only disabling ipv6 flag */
841                 if (!*disable && i == IPV6_SHIFT)
842                         continue;
843 
844                 if (strcmp(f, pkt_flag_names[i]) == 0)
845                         return 1 << i;
846         }
847 
848         if (strcmp(f, "FLOW_RND") == 0) {
849                 *disable = !*disable;
850                 return F_FLOW_SEQ;
851         }
852 
853         return 0;
854 }
855 
856 static ssize_t pktgen_if_write(struct file *file,
857                                const char __user * user_buffer, size_t count,
858                                loff_t * offset)
859 {
860         struct seq_file *seq = file->private_data;
861         struct pktgen_dev *pkt_dev = seq->private;
862         int i, max, len;
863         char name[16], valstr[32];
864         unsigned long value = 0;
865         char *pg_result = NULL;
866         int tmp = 0;
867         char buf[128];
868 
869         pg_result = &(pkt_dev->result[0]);
870 
871         if (count < 1) {
872                 pr_warn("wrong command format\n");
873                 return -EINVAL;
874         }
875 
876         max = count;
877         tmp = count_trail_chars(user_buffer, max);
878         if (tmp < 0) {
879                 pr_warn("illegal format\n");
880                 return tmp;
881         }
882         i = tmp;
883 
884         /* Read variable name */
885 
886         len = strn_len(&user_buffer[i], sizeof(name) - 1);
887         if (len < 0)
888                 return len;
889 
890         memset(name, 0, sizeof(name));
891         if (copy_from_user(name, &user_buffer[i], len))
892                 return -EFAULT;
893         i += len;
894 
895         max = count - i;
896         len = count_trail_chars(&user_buffer[i], max);
897         if (len < 0)
898                 return len;
899 
900         i += len;
901 
902         if (debug) {
903                 size_t copy = min_t(size_t, count + 1, 1024);
904                 char *tp = strndup_user(user_buffer, copy);
905 
906                 if (IS_ERR(tp))
907                         return PTR_ERR(tp);
908 
909                 pr_debug("%s,%zu  buffer -:%s:-\n", name, count, tp);
910                 kfree(tp);
911         }
912 
913         if (!strcmp(name, "min_pkt_size")) {
914                 len = num_arg(&user_buffer[i], 10, &value);
915                 if (len < 0)
916                         return len;
917 
918                 i += len;
919                 if (value < 14 + 20 + 8)
920                         value = 14 + 20 + 8;
921                 if (value != pkt_dev->min_pkt_size) {
922                         pkt_dev->min_pkt_size = value;
923                         pkt_dev->cur_pkt_size = value;
924                 }
925                 sprintf(pg_result, "OK: min_pkt_size=%u",
926                         pkt_dev->min_pkt_size);
927                 return count;
928         }
929 
930         if (!strcmp(name, "max_pkt_size")) {
931                 len = num_arg(&user_buffer[i], 10, &value);
932                 if (len < 0)
933                         return len;
934 
935                 i += len;
936                 if (value < 14 + 20 + 8)
937                         value = 14 + 20 + 8;
938                 if (value != pkt_dev->max_pkt_size) {
939                         pkt_dev->max_pkt_size = value;
940                         pkt_dev->cur_pkt_size = value;
941                 }
942                 sprintf(pg_result, "OK: max_pkt_size=%u",
943                         pkt_dev->max_pkt_size);
944                 return count;
945         }
946 
947         /* Shortcut for min = max */
948 
949         if (!strcmp(name, "pkt_size")) {
950                 len = num_arg(&user_buffer[i], 10, &value);
951                 if (len < 0)
952                         return len;
953 
954                 i += len;
955                 if (value < 14 + 20 + 8)
956                         value = 14 + 20 + 8;
957                 if (value != pkt_dev->min_pkt_size) {
958                         pkt_dev->min_pkt_size = value;
959                         pkt_dev->max_pkt_size = value;
960                         pkt_dev->cur_pkt_size = value;
961                 }
962                 sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
963                 return count;
964         }
965 
966         if (!strcmp(name, "debug")) {
967                 len = num_arg(&user_buffer[i], 10, &value);
968                 if (len < 0)
969                         return len;
970 
971                 i += len;
972                 debug = value;
973                 sprintf(pg_result, "OK: debug=%u", debug);
974                 return count;
975         }
976 
977         if (!strcmp(name, "frags")) {
978                 len = num_arg(&user_buffer[i], 10, &value);
979                 if (len < 0)
980                         return len;
981 
982                 i += len;
983                 pkt_dev->nfrags = value;
984                 sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
985                 return count;
986         }
987         if (!strcmp(name, "delay")) {
988                 len = num_arg(&user_buffer[i], 10, &value);
989                 if (len < 0)
990                         return len;
991 
992                 i += len;
993                 if (value == 0x7FFFFFFF)
994                         pkt_dev->delay = ULLONG_MAX;
995                 else
996                         pkt_dev->delay = (u64)value;
997 
998                 sprintf(pg_result, "OK: delay=%llu",
999                         (unsigned long long) pkt_dev->delay);
1000                 return count;
1001         }
1002         if (!strcmp(name, "rate")) {
1003                 len = num_arg(&user_buffer[i], 10, &value);
1004                 if (len < 0)
1005                         return len;
1006 
1007                 i += len;
1008                 if (!value)
1009                         return len;
1010                 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
1011                 if (debug)
1012                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1013 
1014                 sprintf(pg_result, "OK: rate=%lu", value);
1015                 return count;
1016         }
1017         if (!strcmp(name, "ratep")) {
1018                 len = num_arg(&user_buffer[i], 10, &value);
1019                 if (len < 0)
1020                         return len;
1021 
1022                 i += len;
1023                 if (!value)
1024                         return len;
1025                 pkt_dev->delay = NSEC_PER_SEC/value;
1026                 if (debug)
1027                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1028 
1029                 sprintf(pg_result, "OK: rate=%lu", value);
1030                 return count;
1031         }
1032         if (!strcmp(name, "udp_src_min")) {
1033                 len = num_arg(&user_buffer[i], 10, &value);
1034                 if (len < 0)
1035                         return len;
1036 
1037                 i += len;
1038                 if (value != pkt_dev->udp_src_min) {
1039                         pkt_dev->udp_src_min = value;
1040                         pkt_dev->cur_udp_src = value;
1041                 }
1042                 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
1043                 return count;
1044         }
1045         if (!strcmp(name, "udp_dst_min")) {
1046                 len = num_arg(&user_buffer[i], 10, &value);
1047                 if (len < 0)
1048                         return len;
1049 
1050                 i += len;
1051                 if (value != pkt_dev->udp_dst_min) {
1052                         pkt_dev->udp_dst_min = value;
1053                         pkt_dev->cur_udp_dst = value;
1054                 }
1055                 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
1056                 return count;
1057         }
1058         if (!strcmp(name, "udp_src_max")) {
1059                 len = num_arg(&user_buffer[i], 10, &value);
1060                 if (len < 0)
1061                         return len;
1062 
1063                 i += len;
1064                 if (value != pkt_dev->udp_src_max) {
1065                         pkt_dev->udp_src_max = value;
1066                         pkt_dev->cur_udp_src = value;
1067                 }
1068                 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
1069                 return count;
1070         }
1071         if (!strcmp(name, "udp_dst_max")) {
1072                 len = num_arg(&user_buffer[i], 10, &value);
1073                 if (len < 0)
1074                         return len;
1075 
1076                 i += len;
1077                 if (value != pkt_dev->udp_dst_max) {
1078                         pkt_dev->udp_dst_max = value;
1079                         pkt_dev->cur_udp_dst = value;
1080                 }
1081                 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
1082                 return count;
1083         }
1084         if (!strcmp(name, "clone_skb")) {
1085                 len = num_arg(&user_buffer[i], 10, &value);
1086                 if (len < 0)
1087                         return len;
1088                 if ((value > 0) &&
1089                     ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) ||
1090                      !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1091                         return -ENOTSUPP;
1092                 i += len;
1093                 pkt_dev->clone_skb = value;
1094 
1095                 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
1096                 return count;
1097         }
1098         if (!strcmp(name, "count")) {
1099                 len = num_arg(&user_buffer[i], 10, &value);
1100                 if (len < 0)
1101                         return len;
1102 
1103                 i += len;
1104                 pkt_dev->count = value;
1105                 sprintf(pg_result, "OK: count=%llu",
1106                         (unsigned long long)pkt_dev->count);
1107                 return count;
1108         }
1109         if (!strcmp(name, "src_mac_count")) {
1110                 len = num_arg(&user_buffer[i], 10, &value);
1111                 if (len < 0)
1112                         return len;
1113 
1114                 i += len;
1115                 if (pkt_dev->src_mac_count != value) {
1116                         pkt_dev->src_mac_count = value;
1117                         pkt_dev->cur_src_mac_offset = 0;
1118                 }
1119                 sprintf(pg_result, "OK: src_mac_count=%d",
1120                         pkt_dev->src_mac_count);
1121                 return count;
1122         }
1123         if (!strcmp(name, "dst_mac_count")) {
1124                 len = num_arg(&user_buffer[i], 10, &value);
1125                 if (len < 0)
1126                         return len;
1127 
1128                 i += len;
1129                 if (pkt_dev->dst_mac_count != value) {
1130                         pkt_dev->dst_mac_count = value;
1131                         pkt_dev->cur_dst_mac_offset = 0;
1132                 }
1133                 sprintf(pg_result, "OK: dst_mac_count=%d",
1134                         pkt_dev->dst_mac_count);
1135                 return count;
1136         }
1137         if (!strcmp(name, "burst")) {
1138                 len = num_arg(&user_buffer[i], 10, &value);
1139                 if (len < 0)
1140                         return len;
1141 
1142                 i += len;
1143                 if ((value > 1) &&
1144                     ((pkt_dev->xmit_mode == M_QUEUE_XMIT) ||
1145                      ((pkt_dev->xmit_mode == M_START_XMIT) &&
1146                      (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))))
1147                         return -ENOTSUPP;
1148                 pkt_dev->burst = value < 1 ? 1 : value;
1149                 sprintf(pg_result, "OK: burst=%d", pkt_dev->burst);
1150                 return count;
1151         }
1152         if (!strcmp(name, "node")) {
1153                 len = num_arg(&user_buffer[i], 10, &value);
1154                 if (len < 0)
1155                         return len;
1156 
1157                 i += len;
1158 
1159                 if (node_possible(value)) {
1160                         pkt_dev->node = value;
1161                         sprintf(pg_result, "OK: node=%d", pkt_dev->node);
1162                         if (pkt_dev->page) {
1163                                 put_page(pkt_dev->page);
1164                                 pkt_dev->page = NULL;
1165                         }
1166                 }
1167                 else
1168                         sprintf(pg_result, "ERROR: node not possible");
1169                 return count;
1170         }
1171         if (!strcmp(name, "xmit_mode")) {
1172                 char f[32];
1173 
1174                 memset(f, 0, 32);
1175                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1176                 if (len < 0)
1177                         return len;
1178 
1179                 if (copy_from_user(f, &user_buffer[i], len))
1180                         return -EFAULT;
1181                 i += len;
1182 
1183                 if (strcmp(f, "start_xmit") == 0) {
1184                         pkt_dev->xmit_mode = M_START_XMIT;
1185                 } else if (strcmp(f, "netif_receive") == 0) {
1186                         /* clone_skb set earlier, not supported in this mode */
1187                         if (pkt_dev->clone_skb > 0)
1188                                 return -ENOTSUPP;
1189 
1190                         pkt_dev->xmit_mode = M_NETIF_RECEIVE;
1191 
1192                         /* make sure new packet is allocated every time
1193                          * pktgen_xmit() is called
1194                          */
1195                         pkt_dev->last_ok = 1;
1196 
1197                         /* override clone_skb if user passed default value
1198                          * at module loading time
1199                          */
1200                         pkt_dev->clone_skb = 0;
1201                 } else if (strcmp(f, "queue_xmit") == 0) {
1202                         pkt_dev->xmit_mode = M_QUEUE_XMIT;
1203                         pkt_dev->last_ok = 1;
1204                 } else {
1205                         sprintf(pg_result,
1206                                 "xmit_mode -:%s:- unknown\nAvailable modes: %s",
1207                                 f, "start_xmit, netif_receive\n");
1208                         return count;
1209                 }
1210                 sprintf(pg_result, "OK: xmit_mode=%s", f);
1211                 return count;
1212         }
1213         if (!strcmp(name, "flag")) {
1214                 __u32 flag;
1215                 char f[32];
1216                 bool disable = false;
1217 
1218                 memset(f, 0, 32);
1219                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1220                 if (len < 0)
1221                         return len;
1222 
1223                 if (copy_from_user(f, &user_buffer[i], len))
1224                         return -EFAULT;
1225                 i += len;
1226 
1227                 flag = pktgen_read_flag(f, &disable);
1228 
1229                 if (flag) {
1230                         if (disable)
1231                                 pkt_dev->flags &= ~flag;
1232                         else
1233                                 pkt_dev->flags |= flag;
1234                 } else {
1235                         sprintf(pg_result,
1236                                 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
1237                                 f,
1238                                 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
1239                                 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, "
1240                                 "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, "
1241                                 "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
1242                                 "NO_TIMESTAMP, "
1243 #ifdef CONFIG_XFRM
1244                                 "IPSEC, "
1245 #endif
1246                                 "NODE_ALLOC\n");
1247                         return count;
1248                 }
1249                 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
1250                 return count;
1251         }
1252         if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
1253                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
1254                 if (len < 0)
1255                         return len;
1256 
1257                 if (copy_from_user(buf, &user_buffer[i], len))
1258                         return -EFAULT;
1259                 buf[len] = 0;
1260                 if (strcmp(buf, pkt_dev->dst_min) != 0) {
1261                         memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
1262                         strcpy(pkt_dev->dst_min, buf);
1263                         pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
1264                         pkt_dev->cur_daddr = pkt_dev->daddr_min;
1265                 }
1266                 if (debug)
1267                         pr_debug("dst_min set to: %s\n", pkt_dev->dst_min);
1268                 i += len;
1269                 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
1270                 return count;
1271         }
1272         if (!strcmp(name, "dst_max")) {
1273                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
1274                 if (len < 0)
1275                         return len;
1276 
1277                 if (copy_from_user(buf, &user_buffer[i], len))
1278                         return -EFAULT;
1279                 buf[len] = 0;
1280                 if (strcmp(buf, pkt_dev->dst_max) != 0) {
1281                         memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
1282                         strcpy(pkt_dev->dst_max, buf);
1283                         pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
1284                         pkt_dev->cur_daddr = pkt_dev->daddr_max;
1285                 }
1286                 if (debug)
1287                         pr_debug("dst_max set to: %s\n", pkt_dev->dst_max);
1288                 i += len;
1289                 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
1290                 return count;
1291         }
1292         if (!strcmp(name, "dst6")) {
1293                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1294                 if (len < 0)
1295                         return len;
1296 
1297                 pkt_dev->flags |= F_IPV6;
1298 
1299                 if (copy_from_user(buf, &user_buffer[i], len))
1300                         return -EFAULT;
1301                 buf[len] = 0;
1302 
1303                 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL);
1304                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr);
1305 
1306                 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr;
1307 
1308                 if (debug)
1309                         pr_debug("dst6 set to: %s\n", buf);
1310 
1311                 i += len;
1312                 sprintf(pg_result, "OK: dst6=%s", buf);
1313                 return count;
1314         }
1315         if (!strcmp(name, "dst6_min")) {
1316                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1317                 if (len < 0)
1318                         return len;
1319 
1320                 pkt_dev->flags |= F_IPV6;
1321 
1322                 if (copy_from_user(buf, &user_buffer[i], len))
1323                         return -EFAULT;
1324                 buf[len] = 0;
1325 
1326                 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL);
1327                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr);
1328 
1329                 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr;
1330                 if (debug)
1331                         pr_debug("dst6_min set to: %s\n", buf);
1332 
1333                 i += len;
1334                 sprintf(pg_result, "OK: dst6_min=%s", buf);
1335                 return count;
1336         }
1337         if (!strcmp(name, "dst6_max")) {
1338                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1339                 if (len < 0)
1340                         return len;
1341 
1342                 pkt_dev->flags |= F_IPV6;
1343 
1344                 if (copy_from_user(buf, &user_buffer[i], len))
1345                         return -EFAULT;
1346                 buf[len] = 0;
1347 
1348                 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL);
1349                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr);
1350 
1351                 if (debug)
1352                         pr_debug("dst6_max set to: %s\n", buf);
1353 
1354                 i += len;
1355                 sprintf(pg_result, "OK: dst6_max=%s", buf);
1356                 return count;
1357         }
1358         if (!strcmp(name, "src6")) {
1359                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1360                 if (len < 0)
1361                         return len;
1362 
1363                 pkt_dev->flags |= F_IPV6;
1364 
1365                 if (copy_from_user(buf, &user_buffer[i], len))
1366                         return -EFAULT;
1367                 buf[len] = 0;
1368 
1369                 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL);
1370                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr);
1371 
1372                 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr;
1373 
1374                 if (debug)
1375                         pr_debug("src6 set to: %s\n", buf);
1376 
1377                 i += len;
1378                 sprintf(pg_result, "OK: src6=%s", buf);
1379                 return count;
1380         }
1381         if (!strcmp(name, "src_min")) {
1382                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
1383                 if (len < 0)
1384                         return len;
1385 
1386                 if (copy_from_user(buf, &user_buffer[i], len))
1387                         return -EFAULT;
1388                 buf[len] = 0;
1389                 if (strcmp(buf, pkt_dev->src_min) != 0) {
1390                         memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
1391                         strcpy(pkt_dev->src_min, buf);
1392                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
1393                         pkt_dev->cur_saddr = pkt_dev->saddr_min;
1394                 }
1395                 if (debug)
1396                         pr_debug("src_min set to: %s\n", pkt_dev->src_min);
1397                 i += len;
1398                 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
1399                 return count;
1400         }
1401         if (!strcmp(name, "src_max")) {
1402                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
1403                 if (len < 0)
1404                         return len;
1405 
1406                 if (copy_from_user(buf, &user_buffer[i], len))
1407                         return -EFAULT;
1408                 buf[len] = 0;
1409                 if (strcmp(buf, pkt_dev->src_max) != 0) {
1410                         memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
1411                         strcpy(pkt_dev->src_max, buf);
1412                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
1413                         pkt_dev->cur_saddr = pkt_dev->saddr_max;
1414                 }
1415                 if (debug)
1416                         pr_debug("src_max set to: %s\n", pkt_dev->src_max);
1417                 i += len;
1418                 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
1419                 return count;
1420         }
1421         if (!strcmp(name, "dst_mac")) {
1422                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1423                 if (len < 0)
1424                         return len;
1425 
1426                 memset(valstr, 0, sizeof(valstr));
1427                 if (copy_from_user(valstr, &user_buffer[i], len))
1428                         return -EFAULT;
1429 
1430                 if (!mac_pton(valstr, pkt_dev->dst_mac))
1431                         return -EINVAL;
1432                 /* Set up Dest MAC */
1433                 ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac);
1434 
1435                 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac);
1436                 return count;
1437         }
1438         if (!strcmp(name, "src_mac")) {
1439                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1440                 if (len < 0)
1441                         return len;
1442 
1443                 memset(valstr, 0, sizeof(valstr));
1444                 if (copy_from_user(valstr, &user_buffer[i], len))
1445                         return -EFAULT;
1446 
1447                 if (!mac_pton(valstr, pkt_dev->src_mac))
1448                         return -EINVAL;
1449                 /* Set up Src MAC */
1450                 ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac);
1451 
1452                 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac);
1453                 return count;
1454         }
1455 
1456         if (!strcmp(name, "clear_counters")) {
1457                 pktgen_clear_counters(pkt_dev);
1458                 sprintf(pg_result, "OK: Clearing counters.\n");
1459                 return count;
1460         }
1461 
1462         if (!strcmp(name, "flows")) {
1463                 len = num_arg(&user_buffer[i], 10, &value);
1464                 if (len < 0)
1465                         return len;
1466 
1467                 i += len;
1468                 if (value > MAX_CFLOWS)
1469                         value = MAX_CFLOWS;
1470 
1471                 pkt_dev->cflows = value;
1472                 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
1473                 return count;
1474         }
1475 #ifdef CONFIG_XFRM
1476         if (!strcmp(name, "spi")) {
1477                 len = num_arg(&user_buffer[i], 10, &value);
1478                 if (len < 0)
1479                         return len;
1480 
1481                 i += len;
1482                 pkt_dev->spi = value;
1483                 sprintf(pg_result, "OK: spi=%u", pkt_dev->spi);
1484                 return count;
1485         }
1486 #endif
1487         if (!strcmp(name, "flowlen")) {
1488                 len = num_arg(&user_buffer[i], 10, &value);
1489                 if (len < 0)
1490                         return len;
1491 
1492                 i += len;
1493                 pkt_dev->lflow = value;
1494                 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
1495                 return count;
1496         }
1497 
1498         if (!strcmp(name, "queue_map_min")) {
1499                 len = num_arg(&user_buffer[i], 5, &value);
1500                 if (len < 0)
1501                         return len;
1502 
1503                 i += len;
1504                 pkt_dev->queue_map_min = value;
1505                 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
1506                 return count;
1507         }
1508 
1509         if (!strcmp(name, "queue_map_max")) {
1510                 len = num_arg(&user_buffer[i], 5, &value);
1511                 if (len < 0)
1512                         return len;
1513 
1514                 i += len;
1515                 pkt_dev->queue_map_max = value;
1516                 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
1517                 return count;
1518         }
1519 
1520         if (!strcmp(name, "mpls")) {
1521                 unsigned int n, cnt;
1522 
1523                 len = get_labels(&user_buffer[i], pkt_dev);
1524                 if (len < 0)
1525                         return len;
1526                 i += len;
1527                 cnt = sprintf(pg_result, "OK: mpls=");
1528                 for (n = 0; n < pkt_dev->nr_labels; n++)
1529                         cnt += sprintf(pg_result + cnt,
1530                                        "%08x%s", ntohl(pkt_dev->labels[n]),
1531                                        n == pkt_dev->nr_labels-1 ? "" : ",");
1532 
1533                 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
1534                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1535                         pkt_dev->svlan_id = 0xffff;
1536 
1537                         if (debug)
1538                                 pr_debug("VLAN/SVLAN auto turned off\n");
1539                 }
1540                 return count;
1541         }
1542 
1543         if (!strcmp(name, "vlan_id")) {
1544                 len = num_arg(&user_buffer[i], 4, &value);
1545                 if (len < 0)
1546                         return len;
1547 
1548                 i += len;
1549                 if (value <= 4095) {
1550                         pkt_dev->vlan_id = value;  /* turn on VLAN */
1551 
1552                         if (debug)
1553                                 pr_debug("VLAN turned on\n");
1554 
1555                         if (debug && pkt_dev->nr_labels)
1556                                 pr_debug("MPLS auto turned off\n");
1557 
1558                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1559                         sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
1560                 } else {
1561                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1562                         pkt_dev->svlan_id = 0xffff;
1563 
1564                         if (debug)
1565                                 pr_debug("VLAN/SVLAN turned off\n");
1566                 }
1567                 return count;
1568         }
1569 
1570         if (!strcmp(name, "vlan_p")) {
1571                 len = num_arg(&user_buffer[i], 1, &value);
1572                 if (len < 0)
1573                         return len;
1574 
1575                 i += len;
1576                 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
1577                         pkt_dev->vlan_p = value;
1578                         sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
1579                 } else {
1580                         sprintf(pg_result, "ERROR: vlan_p must be 0-7");
1581                 }
1582                 return count;
1583         }
1584 
1585         if (!strcmp(name, "vlan_cfi")) {
1586                 len = num_arg(&user_buffer[i], 1, &value);
1587                 if (len < 0)
1588                         return len;
1589 
1590                 i += len;
1591                 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
1592                         pkt_dev->vlan_cfi = value;
1593                         sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
1594                 } else {
1595                         sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
1596                 }
1597                 return count;
1598         }
1599 
1600         if (!strcmp(name, "svlan_id")) {
1601                 len = num_arg(&user_buffer[i], 4, &value);
1602                 if (len < 0)
1603                         return len;
1604 
1605                 i += len;
1606                 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
1607                         pkt_dev->svlan_id = value;  /* turn on SVLAN */
1608 
1609                         if (debug)
1610                                 pr_debug("SVLAN turned on\n");
1611 
1612                         if (debug && pkt_dev->nr_labels)
1613                                 pr_debug("MPLS auto turned off\n");
1614 
1615                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1616                         sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
1617                 } else {
1618                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1619                         pkt_dev->svlan_id = 0xffff;
1620 
1621                         if (debug)
1622                                 pr_debug("VLAN/SVLAN turned off\n");
1623                 }
1624                 return count;
1625         }
1626 
1627         if (!strcmp(name, "svlan_p")) {
1628                 len = num_arg(&user_buffer[i], 1, &value);
1629                 if (len < 0)
1630                         return len;
1631 
1632                 i += len;
1633                 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
1634                         pkt_dev->svlan_p = value;
1635                         sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
1636                 } else {
1637                         sprintf(pg_result, "ERROR: svlan_p must be 0-7");
1638                 }
1639                 return count;
1640         }
1641 
1642         if (!strcmp(name, "svlan_cfi")) {
1643                 len = num_arg(&user_buffer[i], 1, &value);
1644                 if (len < 0)
1645                         return len;
1646 
1647                 i += len;
1648                 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
1649                         pkt_dev->svlan_cfi = value;
1650                         sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
1651                 } else {
1652                         sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
1653                 }
1654                 return count;
1655         }
1656 
1657         if (!strcmp(name, "tos")) {
1658                 __u32 tmp_value = 0;
1659                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1660                 if (len < 0)
1661                         return len;
1662 
1663                 i += len;
1664                 if (len == 2) {
1665                         pkt_dev->tos = tmp_value;
1666                         sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
1667                 } else {
1668                         sprintf(pg_result, "ERROR: tos must be 00-ff");
1669                 }
1670                 return count;
1671         }
1672 
1673         if (!strcmp(name, "traffic_class")) {
1674                 __u32 tmp_value = 0;
1675                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1676                 if (len < 0)
1677                         return len;
1678 
1679                 i += len;
1680                 if (len == 2) {
1681                         pkt_dev->traffic_class = tmp_value;
1682                         sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
1683                 } else {
1684                         sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
1685                 }
1686                 return count;
1687         }
1688 
1689         if (!strcmp(name, "skb_priority")) {
1690                 len = num_arg(&user_buffer[i], 9, &value);
1691                 if (len < 0)
1692                         return len;
1693 
1694                 i += len;
1695                 pkt_dev->skb_priority = value;
1696                 sprintf(pg_result, "OK: skb_priority=%i",
1697                         pkt_dev->skb_priority);
1698                 return count;
1699         }
1700 
1701         sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
1702         return -EINVAL;
1703 }
1704 
1705 static int pktgen_if_open(struct inode *inode, struct file *file)
1706 {
1707         return single_open(file, pktgen_if_show, PDE_DATA(inode));
1708 }
1709 
1710 static const struct file_operations pktgen_if_fops = {
1711         .open    = pktgen_if_open,
1712         .read    = seq_read,
1713         .llseek  = seq_lseek,
1714         .write   = pktgen_if_write,
1715         .release = single_release,
1716 };
1717 
1718 static int pktgen_thread_show(struct seq_file *seq, void *v)
1719 {
1720         struct pktgen_thread *t = seq->private;
1721         const struct pktgen_dev *pkt_dev;
1722 
1723         BUG_ON(!t);
1724 
1725         seq_puts(seq, "Running: ");
1726 
1727         rcu_read_lock();
1728         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1729                 if (pkt_dev->running)
1730                         seq_printf(seq, "%s ", pkt_dev->odevname);
1731 
1732         seq_puts(seq, "\nStopped: ");
1733 
1734         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1735                 if (!pkt_dev->running)
1736                         seq_printf(seq, "%s ", pkt_dev->odevname);
1737 
1738         if (t->result[0])
1739                 seq_printf(seq, "\nResult: %s\n", t->result);
1740         else
1741                 seq_puts(seq, "\nResult: NA\n");
1742 
1743         rcu_read_unlock();
1744 
1745         return 0;
1746 }
1747 
1748 static ssize_t pktgen_thread_write(struct file *file,
1749                                    const char __user * user_buffer,
1750                                    size_t count, loff_t * offset)
1751 {
1752         struct seq_file *seq = file->private_data;
1753         struct pktgen_thread *t = seq->private;
1754         int i, max, len, ret;
1755         char name[40];
1756         char *pg_result;
1757 
1758         if (count < 1) {
1759                 //      sprintf(pg_result, "Wrong command format");
1760                 return -EINVAL;
1761         }
1762 
1763         max = count;
1764         len = count_trail_chars(user_buffer, max);
1765         if (len < 0)
1766                 return len;
1767 
1768         i = len;
1769 
1770         /* Read variable name */
1771 
1772         len = strn_len(&user_buffer[i], sizeof(name) - 1);
1773         if (len < 0)
1774                 return len;
1775 
1776         memset(name, 0, sizeof(name));
1777         if (copy_from_user(name, &user_buffer[i], len))
1778                 return -EFAULT;
1779         i += len;
1780 
1781         max = count - i;
1782         len = count_trail_chars(&user_buffer[i], max);
1783         if (len < 0)
1784                 return len;
1785 
1786         i += len;
1787 
1788         if (debug)
1789                 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count);
1790 
1791         if (!t) {
1792                 pr_err("ERROR: No thread\n");
1793                 ret = -EINVAL;
1794                 goto out;
1795         }
1796 
1797         pg_result = &(t->result[0]);
1798 
1799         if (!strcmp(name, "add_device")) {
1800                 char f[32];
1801                 memset(f, 0, 32);
1802                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1803                 if (len < 0) {
1804                         ret = len;
1805                         goto out;
1806                 }
1807                 if (copy_from_user(f, &user_buffer[i], len))
1808                         return -EFAULT;
1809                 i += len;
1810                 mutex_lock(&pktgen_thread_lock);
1811                 ret = pktgen_add_device(t, f);
1812                 mutex_unlock(&pktgen_thread_lock);
1813                 if (!ret) {
1814                         ret = count;
1815                         sprintf(pg_result, "OK: add_device=%s", f);
1816                 } else
1817                         sprintf(pg_result, "ERROR: can not add device %s", f);
1818                 goto out;
1819         }
1820 
1821         if (!strcmp(name, "rem_device_all")) {
1822                 mutex_lock(&pktgen_thread_lock);
1823                 t->control |= T_REMDEVALL;
1824                 mutex_unlock(&pktgen_thread_lock);
1825                 schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
1826                 ret = count;
1827                 sprintf(pg_result, "OK: rem_device_all");
1828                 goto out;
1829         }
1830 
1831         if (!strcmp(name, "max_before_softirq")) {
1832                 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use");
1833                 ret = count;
1834                 goto out;
1835         }
1836 
1837         ret = -EINVAL;
1838 out:
1839         return ret;
1840 }
1841 
1842 static int pktgen_thread_open(struct inode *inode, struct file *file)
1843 {
1844         return single_open(file, pktgen_thread_show, PDE_DATA(inode));
1845 }
1846 
1847 static const struct file_operations pktgen_thread_fops = {
1848         .open    = pktgen_thread_open,
1849         .read    = seq_read,
1850         .llseek  = seq_lseek,
1851         .write   = pktgen_thread_write,
1852         .release = single_release,
1853 };
1854 
1855 /* Think find or remove for NN */
1856 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
1857                                               const char *ifname, int remove)
1858 {
1859         struct pktgen_thread *t;
1860         struct pktgen_dev *pkt_dev = NULL;
1861         bool exact = (remove == FIND);
1862 
1863         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1864                 pkt_dev = pktgen_find_dev(t, ifname, exact);
1865                 if (pkt_dev) {
1866                         if (remove) {
1867                                 pkt_dev->removal_mark = 1;
1868                                 t->control |= T_REMDEV;
1869                         }
1870                         break;
1871                 }
1872         }
1873         return pkt_dev;
1874 }
1875 
1876 /*
1877  * mark a device for removal
1878  */
1879 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname)
1880 {
1881         struct pktgen_dev *pkt_dev = NULL;
1882         const int max_tries = 10, msec_per_try = 125;
1883         int i = 0;
1884 
1885         mutex_lock(&pktgen_thread_lock);
1886         pr_debug("%s: marking %s for removal\n", __func__, ifname);
1887 
1888         while (1) {
1889 
1890                 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE);
1891                 if (pkt_dev == NULL)
1892                         break;  /* success */
1893 
1894                 mutex_unlock(&pktgen_thread_lock);
1895                 pr_debug("%s: waiting for %s to disappear....\n",
1896                          __func__, ifname);
1897                 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try));
1898                 mutex_lock(&pktgen_thread_lock);
1899 
1900                 if (++i >= max_tries) {
1901                         pr_err("%s: timed out after waiting %d msec for device %s to be removed\n",
1902                                __func__, msec_per_try * i, ifname);
1903                         break;
1904                 }
1905 
1906         }
1907 
1908         mutex_unlock(&pktgen_thread_lock);
1909 }
1910 
1911 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev)
1912 {
1913         struct pktgen_thread *t;
1914 
1915         mutex_lock(&pktgen_thread_lock);
1916 
1917         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1918                 struct pktgen_dev *pkt_dev;
1919 
1920                 if_lock(t);
1921                 list_for_each_entry(pkt_dev, &t->if_list, list) {
1922                         if (pkt_dev->odev != dev)
1923                                 continue;
1924 
1925                         proc_remove(pkt_dev->entry);
1926 
1927                         pkt_dev->entry = proc_create_data(dev->name, 0600,
1928                                                           pn->proc_dir,
1929                                                           &pktgen_if_fops,
1930                                                           pkt_dev);
1931                         if (!pkt_dev->entry)
1932                                 pr_err("can't move proc entry for '%s'\n",
1933                                        dev->name);
1934                         break;
1935                 }
1936                 if_unlock(t);
1937         }
1938         mutex_unlock(&pktgen_thread_lock);
1939 }
1940 
1941 static int pktgen_device_event(struct notifier_block *unused,
1942                                unsigned long event, void *ptr)
1943 {
1944         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1945         struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id);
1946 
1947         if (pn->pktgen_exiting)
1948                 return NOTIFY_DONE;
1949 
1950         /* It is OK that we do not hold the group lock right now,
1951          * as we run under the RTNL lock.
1952          */
1953 
1954         switch (event) {
1955         case NETDEV_CHANGENAME:
1956                 pktgen_change_name(pn, dev);
1957                 break;
1958 
1959         case NETDEV_UNREGISTER:
1960                 pktgen_mark_device(pn, dev->name);
1961                 break;
1962         }
1963 
1964         return NOTIFY_DONE;
1965 }
1966 
1967 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn,
1968                                                  struct pktgen_dev *pkt_dev,
1969                                                  const char *ifname)
1970 {
1971         char b[IFNAMSIZ+5];
1972         int i;
1973 
1974         for (i = 0; ifname[i] != '@'; i++) {
1975                 if (i == IFNAMSIZ)
1976                         break;
1977 
1978                 b[i] = ifname[i];
1979         }
1980         b[i] = 0;
1981 
1982         return dev_get_by_name(pn->net, b);
1983 }
1984 
1985 
1986 /* Associate pktgen_dev with a device. */
1987 
1988 static int pktgen_setup_dev(const struct pktgen_net *pn,
1989                             struct pktgen_dev *pkt_dev, const char *ifname)
1990 {
1991         struct net_device *odev;
1992         int err;
1993 
1994         /* Clean old setups */
1995         if (pkt_dev->odev) {
1996                 dev_put(pkt_dev->odev);
1997                 pkt_dev->odev = NULL;
1998         }
1999 
2000         odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname);
2001         if (!odev) {
2002                 pr_err("no such netdevice: \"%s\"\n", ifname);
2003                 return -ENODEV;
2004         }
2005 
2006         if (odev->type != ARPHRD_ETHER) {
2007                 pr_err("not an ethernet device: \"%s\"\n", ifname);
2008                 err = -EINVAL;
2009         } else if (!netif_running(odev)) {
2010                 pr_err("device is down: \"%s\"\n", ifname);
2011                 err = -ENETDOWN;
2012         } else {
2013                 pkt_dev->odev = odev;
2014                 return 0;
2015         }
2016 
2017         dev_put(odev);
2018         return err;
2019 }
2020 
2021 /* Read pkt_dev from the interface and set up internal pktgen_dev
2022  * structure to have the right information to create/send packets
2023  */
2024 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
2025 {
2026         int ntxq;
2027 
2028         if (!pkt_dev->odev) {
2029                 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n");
2030                 sprintf(pkt_dev->result,
2031                         "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
2032                 return;
2033         }
2034 
2035         /* make sure that we don't pick a non-existing transmit queue */
2036         ntxq = pkt_dev->odev->real_num_tx_queues;
2037 
2038         if (ntxq <= pkt_dev->queue_map_min) {
2039                 pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2040                         pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq,
2041                         pkt_dev->odevname);
2042                 pkt_dev->queue_map_min = (ntxq ?: 1) - 1;
2043         }
2044         if (pkt_dev->queue_map_max >= ntxq) {
2045                 pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2046                         pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq,
2047                         pkt_dev->odevname);
2048                 pkt_dev->queue_map_max = (ntxq ?: 1) - 1;
2049         }
2050 
2051         /* Default to the interface's mac if not explicitly set. */
2052 
2053         if (is_zero_ether_addr(pkt_dev->src_mac))
2054                 ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr);
2055 
2056         /* Set up Dest MAC */
2057         ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac);
2058 
2059         if (pkt_dev->flags & F_IPV6) {
2060                 int i, set = 0, err = 1;
2061                 struct inet6_dev *idev;
2062 
2063                 if (pkt_dev->min_pkt_size == 0) {
2064                         pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
2065                                                 + sizeof(struct udphdr)
2066                                                 + sizeof(struct pktgen_hdr)
2067                                                 + pkt_dev->pkt_overhead;
2068                 }
2069 
2070                 for (i = 0; i < sizeof(struct in6_addr); i++)
2071                         if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
2072                                 set = 1;
2073                                 break;
2074                         }
2075 
2076                 if (!set) {
2077 
2078                         /*
2079                          * Use linklevel address if unconfigured.
2080                          *
2081                          * use ipv6_get_lladdr if/when it's get exported
2082                          */
2083 
2084                         rcu_read_lock();
2085                         idev = __in6_dev_get(pkt_dev->odev);
2086                         if (idev) {
2087                                 struct inet6_ifaddr *ifp;
2088 
2089                                 read_lock_bh(&idev->lock);
2090                                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2091                                         if ((ifp->scope & IFA_LINK) &&
2092                                             !(ifp->flags & IFA_F_TENTATIVE)) {
2093                                                 pkt_dev->cur_in6_saddr = ifp->addr;
2094                                                 err = 0;
2095                                                 break;
2096                                         }
2097                                 }
2098                                 read_unlock_bh(&idev->lock);
2099                         }
2100                         rcu_read_unlock();
2101                         if (err)
2102                                 pr_err("ERROR: IPv6 link address not available\n");
2103                 }
2104         } else {
2105                 if (pkt_dev->min_pkt_size == 0) {
2106                         pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr)
2107                                                 + sizeof(struct udphdr)
2108                                                 + sizeof(struct pktgen_hdr)
2109                                                 + pkt_dev->pkt_overhead;
2110                 }
2111 
2112                 pkt_dev->saddr_min = 0;
2113                 pkt_dev->saddr_max = 0;
2114                 if (strlen(pkt_dev->src_min) == 0) {
2115 
2116                         struct in_device *in_dev;
2117 
2118                         rcu_read_lock();
2119                         in_dev = __in_dev_get_rcu(pkt_dev->odev);
2120                         if (in_dev) {
2121                                 if (in_dev->ifa_list) {
2122                                         pkt_dev->saddr_min =
2123                                             in_dev->ifa_list->ifa_address;
2124                                         pkt_dev->saddr_max = pkt_dev->saddr_min;
2125                                 }
2126                         }
2127                         rcu_read_unlock();
2128                 } else {
2129                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
2130                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
2131                 }
2132 
2133                 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
2134                 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
2135         }
2136         /* Initialize current values. */
2137         pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
2138         if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size)
2139                 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size;
2140 
2141         pkt_dev->cur_dst_mac_offset = 0;
2142         pkt_dev->cur_src_mac_offset = 0;
2143         pkt_dev->cur_saddr = pkt_dev->saddr_min;
2144         pkt_dev->cur_daddr = pkt_dev->daddr_min;
2145         pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2146         pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2147         pkt_dev->nflows = 0;
2148 }
2149 
2150 
2151 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
2152 {
2153         ktime_t start_time, end_time;
2154         s64 remaining;
2155         struct hrtimer_sleeper t;
2156 
2157         hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
2158         hrtimer_set_expires(&t.timer, spin_until);
2159 
2160         remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
2161         if (remaining <= 0)
2162                 goto out;
2163 
2164         start_time = ktime_get();
2165         if (remaining < 100000) {
2166                 /* for small delays (<100us), just loop until limit is reached */
2167                 do {
2168                         end_time = ktime_get();
2169                 } while (ktime_compare(end_time, spin_until) < 0);
2170         } else {
2171                 /* see do_nanosleep */
2172                 hrtimer_init_sleeper(&t, current);
2173                 do {
2174                         set_current_state(TASK_INTERRUPTIBLE);
2175                         hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
2176 
2177                         if (likely(t.task))
2178                                 schedule();
2179 
2180                         hrtimer_cancel(&t.timer);
2181                 } while (t.task && pkt_dev->running && !signal_pending(current));
2182                 __set_current_state(TASK_RUNNING);
2183                 end_time = ktime_get();
2184         }
2185 
2186         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
2187 out:
2188         pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2189         destroy_hrtimer_on_stack(&t.timer);
2190 }
2191 
2192 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
2193 {
2194         pkt_dev->pkt_overhead = 0;
2195         pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
2196         pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
2197         pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
2198 }
2199 
2200 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow)
2201 {
2202         return !!(pkt_dev->flows[flow].flags & F_INIT);
2203 }
2204 
2205 static inline int f_pick(struct pktgen_dev *pkt_dev)
2206 {
2207         int flow = pkt_dev->curfl;
2208 
2209         if (pkt_dev->flags & F_FLOW_SEQ) {
2210                 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) {
2211                         /* reset time */
2212                         pkt_dev->flows[flow].count = 0;
2213                         pkt_dev->flows[flow].flags = 0;
2214                         pkt_dev->curfl += 1;
2215                         if (pkt_dev->curfl >= pkt_dev->cflows)
2216                                 pkt_dev->curfl = 0; /*reset */
2217                 }
2218         } else {
2219                 flow = prandom_u32() % pkt_dev->cflows;
2220                 pkt_dev->curfl = flow;
2221 
2222                 if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
2223                         pkt_dev->flows[flow].count = 0;
2224                         pkt_dev->flows[flow].flags = 0;
2225                 }
2226         }
2227 
2228         return pkt_dev->curfl;
2229 }
2230 
2231 
2232 #ifdef CONFIG_XFRM
2233 /* If there was already an IPSEC SA, we keep it as is, else
2234  * we go look for it ...
2235 */
2236 #define DUMMY_MARK 0
2237 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
2238 {
2239         struct xfrm_state *x = pkt_dev->flows[flow].x;
2240         struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id);
2241         if (!x) {
2242 
2243                 if (pkt_dev->spi) {
2244                         /* We need as quick as possible to find the right SA
2245                          * Searching with minimum criteria to archieve this.
2246                          */
2247                         x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET);
2248                 } else {
2249                         /* slow path: we dont already have xfrm_state */
2250                         x = xfrm_stateonly_find(pn->net, DUMMY_MARK, 0,
2251                                                 (xfrm_address_t *)&pkt_dev->cur_daddr,
2252                                                 (xfrm_address_t *)&pkt_dev->cur_saddr,
2253                                                 AF_INET,
2254                                                 pkt_dev->ipsmode,
2255                                                 pkt_dev->ipsproto, 0);
2256                 }
2257                 if (x) {
2258                         pkt_dev->flows[flow].x = x;
2259                         set_pkt_overhead(pkt_dev);
2260                         pkt_dev->pkt_overhead += x->props.header_len;
2261                 }
2262 
2263         }
2264 }
2265 #endif
2266 static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
2267 {
2268 
2269         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
2270                 pkt_dev->cur_queue_map = smp_processor_id();
2271 
2272         else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
2273                 __u16 t;
2274                 if (pkt_dev->flags & F_QUEUE_MAP_RND) {
2275                         t = prandom_u32() %
2276                                 (pkt_dev->queue_map_max -
2277                                  pkt_dev->queue_map_min + 1)
2278                                 + pkt_dev->queue_map_min;
2279                 } else {
2280                         t = pkt_dev->cur_queue_map + 1;
2281                         if (t > pkt_dev->queue_map_max)
2282                                 t = pkt_dev->queue_map_min;
2283                 }
2284                 pkt_dev->cur_queue_map = t;
2285         }
2286         pkt_dev->cur_queue_map  = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
2287 }
2288 
2289 /* Increment/randomize headers according to flags and current values
2290  * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
2291  */
2292 static void mod_cur_headers(struct pktgen_dev *pkt_dev)
2293 {
2294         __u32 imn;
2295         __u32 imx;
2296         int flow = 0;
2297 
2298         if (pkt_dev->cflows)
2299                 flow = f_pick(pkt_dev);
2300 
2301         /*  Deal with source MAC */
2302         if (pkt_dev->src_mac_count > 1) {
2303                 __u32 mc;
2304                 __u32 tmp;
2305 
2306                 if (pkt_dev->flags & F_MACSRC_RND)
2307                         mc = prandom_u32() % pkt_dev->src_mac_count;
2308                 else {
2309                         mc = pkt_dev->cur_src_mac_offset++;
2310                         if (pkt_dev->cur_src_mac_offset >=
2311                             pkt_dev->src_mac_count)
2312                                 pkt_dev->cur_src_mac_offset = 0;
2313                 }
2314 
2315                 tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
2316                 pkt_dev->hh[11] = tmp;
2317                 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2318                 pkt_dev->hh[10] = tmp;
2319                 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2320                 pkt_dev->hh[9] = tmp;
2321                 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2322                 pkt_dev->hh[8] = tmp;
2323                 tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
2324                 pkt_dev->hh[7] = tmp;
2325         }
2326 
2327         /*  Deal with Destination MAC */
2328         if (pkt_dev->dst_mac_count > 1) {
2329                 __u32 mc;
2330                 __u32 tmp;
2331 
2332                 if (pkt_dev->flags & F_MACDST_RND)
2333                         mc = prandom_u32() % pkt_dev->dst_mac_count;
2334 
2335                 else {
2336                         mc = pkt_dev->cur_dst_mac_offset++;
2337                         if (pkt_dev->cur_dst_mac_offset >=
2338                             pkt_dev->dst_mac_count) {
2339                                 pkt_dev->cur_dst_mac_offset = 0;
2340                         }
2341                 }
2342 
2343                 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
2344                 pkt_dev->hh[5] = tmp;
2345                 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2346                 pkt_dev->hh[4] = tmp;
2347                 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2348                 pkt_dev->hh[3] = tmp;
2349                 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2350                 pkt_dev->hh[2] = tmp;
2351                 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
2352                 pkt_dev->hh[1] = tmp;
2353         }
2354 
2355         if (pkt_dev->flags & F_MPLS_RND) {
2356                 unsigned int i;
2357                 for (i = 0; i < pkt_dev->nr_labels; i++)
2358                         if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM)
2359                                 pkt_dev->labels[i] = MPLS_STACK_BOTTOM |
2360                                              ((__force __be32)prandom_u32() &
2361                                                       htonl(0x000fffff));
2362         }
2363 
2364         if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
2365                 pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
2366         }
2367 
2368         if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
2369                 pkt_dev->svlan_id = prandom_u32() & (4096 - 1);
2370         }
2371 
2372         if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
2373                 if (pkt_dev->flags & F_UDPSRC_RND)
2374                         pkt_dev->cur_udp_src = prandom_u32() %
2375                                 (pkt_dev->udp_src_max - pkt_dev->udp_src_min)
2376                                 + pkt_dev->udp_src_min;
2377 
2378                 else {
2379                         pkt_dev->cur_udp_src++;
2380                         if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
2381                                 pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2382                 }
2383         }
2384 
2385         if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
2386                 if (pkt_dev->flags & F_UDPDST_RND) {
2387                         pkt_dev->cur_udp_dst = prandom_u32() %
2388                                 (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
2389                                 + pkt_dev->udp_dst_min;
2390                 } else {
2391                         pkt_dev->cur_udp_dst++;
2392                         if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
2393                                 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2394                 }
2395         }
2396 
2397         if (!(pkt_dev->flags & F_IPV6)) {
2398 
2399                 imn = ntohl(pkt_dev->saddr_min);
2400                 imx = ntohl(pkt_dev->saddr_max);
2401                 if (imn < imx) {
2402                         __u32 t;
2403                         if (pkt_dev->flags & F_IPSRC_RND)
2404                                 t = prandom_u32() % (imx - imn) + imn;
2405                         else {
2406                                 t = ntohl(pkt_dev->cur_saddr);
2407                                 t++;
2408                                 if (t > imx)
2409                                         t = imn;
2410 
2411                         }
2412                         pkt_dev->cur_saddr = htonl(t);
2413                 }
2414 
2415                 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) {
2416                         pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
2417                 } else {
2418                         imn = ntohl(pkt_dev->daddr_min);
2419                         imx = ntohl(pkt_dev->daddr_max);
2420                         if (imn < imx) {
2421                                 __u32 t;
2422                                 __be32 s;
2423                                 if (pkt_dev->flags & F_IPDST_RND) {
2424 
2425                                         do {
2426                                                 t = prandom_u32() %
2427                                                         (imx - imn) + imn;
2428                                                 s = htonl(t);
2429                                         } while (ipv4_is_loopback(s) ||
2430                                                 ipv4_is_multicast(s) ||
2431                                                 ipv4_is_lbcast(s) ||
2432                                                 ipv4_is_zeronet(s) ||
2433                                                 ipv4_is_local_multicast(s));
2434                                         pkt_dev->cur_daddr = s;
2435                                 } else {
2436                                         t = ntohl(pkt_dev->cur_daddr);
2437                                         t++;
2438                                         if (t > imx) {
2439                                                 t = imn;
2440                                         }
2441                                         pkt_dev->cur_daddr = htonl(t);
2442                                 }
2443                         }
2444                         if (pkt_dev->cflows) {
2445                                 pkt_dev->flows[flow].flags |= F_INIT;
2446                                 pkt_dev->flows[flow].cur_daddr =
2447                                     pkt_dev->cur_daddr;
2448 #ifdef CONFIG_XFRM
2449                                 if (pkt_dev->flags & F_IPSEC)
2450                                         get_ipsec_sa(pkt_dev, flow);
2451 #endif
2452                                 pkt_dev->nflows++;
2453                         }
2454                 }
2455         } else {                /* IPV6 * */
2456 
2457                 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
2458                         int i;
2459 
2460                         /* Only random destinations yet */
2461 
2462                         for (i = 0; i < 4; i++) {
2463                                 pkt_dev->cur_in6_daddr.s6_addr32[i] =
2464                                     (((__force __be32)prandom_u32() |
2465                                       pkt_dev->min_in6_daddr.s6_addr32[i]) &
2466                                      pkt_dev->max_in6_daddr.s6_addr32[i]);
2467                         }
2468                 }
2469         }
2470 
2471         if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
2472                 __u32 t;
2473                 if (pkt_dev->flags & F_TXSIZE_RND) {
2474                         t = prandom_u32() %
2475                                 (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
2476                                 + pkt_dev->min_pkt_size;
2477                 } else {
2478                         t = pkt_dev->cur_pkt_size + 1;
2479                         if (t > pkt_dev->max_pkt_size)
2480                                 t = pkt_dev->min_pkt_size;
2481                 }
2482                 pkt_dev->cur_pkt_size = t;
2483         }
2484 
2485         set_cur_queue_map(pkt_dev);
2486 
2487         pkt_dev->flows[flow].count++;
2488 }
2489 
2490 
2491 #ifdef CONFIG_XFRM
2492 static u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
2493 
2494         [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
2495 };
2496 
2497 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
2498 {
2499         struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2500         int err = 0;
2501         struct net *net = dev_net(pkt_dev->odev);
2502 
2503         if (!x)
2504                 return 0;
2505         /* XXX: we dont support tunnel mode for now until
2506          * we resolve the dst issue */
2507         if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0))
2508                 return 0;
2509 
2510         /* But when user specify an valid SPI, transformation
2511          * supports both transport/tunnel mode + ESP/AH type.
2512          */
2513         if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0))
2514                 skb->_skb_refdst = (unsigned long)&pkt_dev->xdst.u.dst | SKB_DST_NOREF;
2515 
2516         rcu_read_lock_bh();
2517         err = pktgen_xfrm_outer_mode_output(x, skb);
2518         rcu_read_unlock_bh();
2519         if (err) {
2520                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
2521                 goto error;
2522         }
2523         err = x->type->output(x, skb);
2524         if (err) {
2525                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
2526                 goto error;
2527         }
2528         spin_lock_bh(&x->lock);
2529         x->curlft.bytes += skb->len;
2530         x->curlft.packets++;
2531         spin_unlock_bh(&x->lock);
2532 error:
2533         return err;
2534 }
2535 
2536 static void free_SAs(struct pktgen_dev *pkt_dev)
2537 {
2538         if (pkt_dev->cflows) {
2539                 /* let go of the SAs if we have them */
2540                 int i;
2541                 for (i = 0; i < pkt_dev->cflows; i++) {
2542                         struct xfrm_state *x = pkt_dev->flows[i].x;
2543                         if (x) {
2544                                 xfrm_state_put(x);
2545                                 pkt_dev->flows[i].x = NULL;
2546                         }
2547                 }
2548         }
2549 }
2550 
2551 static int process_ipsec(struct pktgen_dev *pkt_dev,
2552                               struct sk_buff *skb, __be16 protocol)
2553 {
2554         if (pkt_dev->flags & F_IPSEC) {
2555                 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2556                 int nhead = 0;
2557                 if (x) {
2558                         struct ethhdr *eth;
2559                         struct iphdr *iph;
2560                         int ret;
2561 
2562                         nhead = x->props.header_len - skb_headroom(skb);
2563                         if (nhead > 0) {
2564                                 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
2565                                 if (ret < 0) {
2566                                         pr_err("Error expanding ipsec packet %d\n",
2567                                                ret);
2568                                         goto err;
2569                                 }
2570                         }
2571 
2572                         /* ipsec is not expecting ll header */
2573                         skb_pull(skb, ETH_HLEN);
2574                         ret = pktgen_output_ipsec(skb, pkt_dev);
2575                         if (ret) {
2576                                 pr_err("Error creating ipsec packet %d\n", ret);
2577                                 goto err;
2578                         }
2579                         /* restore ll */
2580                         eth = skb_push(skb, ETH_HLEN);
2581                         memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN);
2582                         eth->h_proto = protocol;
2583 
2584                         /* Update IPv4 header len as well as checksum value */
2585                         iph = ip_hdr(skb);
2586                         iph->tot_len = htons(skb->len - ETH_HLEN);
2587                         ip_send_check(iph);
2588                 }
2589         }
2590         return 1;
2591 err:
2592         kfree_skb(skb);
2593         return 0;
2594 }
2595 #endif
2596 
2597 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
2598 {
2599         unsigned int i;
2600         for (i = 0; i < pkt_dev->nr_labels; i++)
2601                 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM;
2602 
2603         mpls--;
2604         *mpls |= MPLS_STACK_BOTTOM;
2605 }
2606 
2607 static inline __be16 build_tci(unsigned int id, unsigned int cfi,
2608                                unsigned int prio)
2609 {
2610         return htons(id | (cfi << 12) | (prio << 13));
2611 }
2612 
2613 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
2614                                 int datalen)
2615 {
2616         struct timespec64 timestamp;
2617         struct pktgen_hdr *pgh;
2618 
2619         pgh = skb_put(skb, sizeof(*pgh));
2620         datalen -= sizeof(*pgh);
2621 
2622         if (pkt_dev->nfrags <= 0) {
2623                 skb_put_zero(skb, datalen);
2624         } else {
2625                 int frags = pkt_dev->nfrags;
2626                 int i, len;
2627                 int frag_len;
2628 
2629 
2630                 if (frags > MAX_SKB_FRAGS)
2631                         frags = MAX_SKB_FRAGS;
2632                 len = datalen - frags * PAGE_SIZE;
2633                 if (len > 0) {
2634                         skb_put_zero(skb, len);
2635                         datalen = frags * PAGE_SIZE;
2636                 }
2637 
2638                 i = 0;
2639                 frag_len = (datalen/frags) < PAGE_SIZE ?
2640                            (datalen/frags) : PAGE_SIZE;
2641                 while (datalen > 0) {
2642                         if (unlikely(!pkt_dev->page)) {
2643                                 int node = numa_node_id();
2644 
2645                                 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
2646                                         node = pkt_dev->node;
2647                                 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
2648                                 if (!pkt_dev->page)
2649                                         break;
2650                         }
2651                         get_page(pkt_dev->page);
2652                         skb_frag_set_page(skb, i, pkt_dev->page);
2653                         skb_shinfo(skb)->frags[i].page_offset = 0;
2654                         /*last fragment, fill rest of data*/
2655                         if (i == (frags - 1))
2656                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i],
2657                                     (datalen < PAGE_SIZE ? datalen : PAGE_SIZE));
2658                         else
2659                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len);
2660                         datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
2661                         skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2662                         skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2663                         i++;
2664                         skb_shinfo(skb)->nr_frags = i;
2665                 }
2666         }
2667 
2668         /* Stamp the time, and sequence number,
2669          * convert them to network byte order
2670          */
2671         pgh->pgh_magic = htonl(PKTGEN_MAGIC);
2672         pgh->seq_num = htonl(pkt_dev->seq_num);
2673 
2674         if (pkt_dev->flags & F_NO_TIMESTAMP) {
2675                 pgh->tv_sec = 0;
2676                 pgh->tv_usec = 0;
2677         } else {
2678                 /*
2679                  * pgh->tv_sec wraps in y2106 when interpreted as unsigned
2680                  * as done by wireshark, or y2038 when interpreted as signed.
2681                  * This is probably harmless, but if anyone wants to improve
2682                  * it, we could introduce a variant that puts 64-bit nanoseconds
2683                  * into the respective header bytes.
2684                  * This would also be slightly faster to read.
2685                  */
2686                 ktime_get_real_ts64(&timestamp);
2687                 pgh->tv_sec = htonl(timestamp.tv_sec);
2688                 pgh->tv_usec = htonl(timestamp.tv_nsec / NSEC_PER_USEC);
2689         }
2690 }
2691 
2692 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
2693                                         struct pktgen_dev *pkt_dev)
2694 {
2695         unsigned int extralen = LL_RESERVED_SPACE(dev);
2696         struct sk_buff *skb = NULL;
2697         unsigned int size;
2698 
2699         size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead;
2700         if (pkt_dev->flags & F_NODE) {
2701                 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
2702 
2703                 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node);
2704                 if (likely(skb)) {
2705                         skb_reserve(skb, NET_SKB_PAD);
2706                         skb->dev = dev;
2707                 }
2708         } else {
2709                  skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
2710         }
2711 
2712         /* the caller pre-fetches from skb->data and reserves for the mac hdr */
2713         if (likely(skb))
2714                 skb_reserve(skb, extralen - 16);
2715 
2716         return skb;
2717 }
2718 
2719 static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
2720                                         struct pktgen_dev *pkt_dev)
2721 {
2722         struct sk_buff *skb = NULL;
2723         __u8 *eth;
2724         struct udphdr *udph;
2725         int datalen, iplen;
2726         struct iphdr *iph;
2727         __be16 protocol = htons(ETH_P_IP);
2728         __be32 *mpls;
2729         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2730         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2731         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2732         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2733         u16 queue_map;
2734 
2735         if (pkt_dev->nr_labels)
2736                 protocol = htons(ETH_P_MPLS_UC);
2737 
2738         if (pkt_dev->vlan_id != 0xffff)
2739                 protocol = htons(ETH_P_8021Q);
2740 
2741         /* Update any of the values, used when we're incrementing various
2742          * fields.
2743          */
2744         mod_cur_headers(pkt_dev);
2745         queue_map = pkt_dev->cur_queue_map;
2746 
2747         skb = pktgen_alloc_skb(odev, pkt_dev);
2748         if (!skb) {
2749                 sprintf(pkt_dev->result, "No memory");
2750                 return NULL;
2751         }
2752 
2753         prefetchw(skb->data);
2754         skb_reserve(skb, 16);
2755 
2756         /*  Reserve for ethernet and IP header  */
2757         eth = skb_push(skb, 14);
2758         mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32));
2759         if (pkt_dev->nr_labels)
2760                 mpls_push(mpls, pkt_dev);
2761 
2762         if (pkt_dev->vlan_id != 0xffff) {
2763                 if (pkt_dev->svlan_id != 0xffff) {
2764                         svlan_tci = skb_put(skb, sizeof(__be16));
2765                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2766                                                pkt_dev->svlan_cfi,
2767                                                pkt_dev->svlan_p);
2768                         svlan_encapsulated_proto = skb_put(skb,
2769                                                            sizeof(__be16));
2770                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2771                 }
2772                 vlan_tci = skb_put(skb, sizeof(__be16));
2773                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2774                                       pkt_dev->vlan_cfi,
2775                                       pkt_dev->vlan_p);
2776                 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16));
2777                 *vlan_encapsulated_proto = htons(ETH_P_IP);
2778         }
2779 
2780         skb_reset_mac_header(skb);
2781         skb_set_network_header(skb, skb->len);
2782         iph = skb_put(skb, sizeof(struct iphdr));
2783 
2784         skb_set_transport_header(skb, skb->len);
2785         udph = skb_put(skb, sizeof(struct udphdr));
2786         skb_set_queue_mapping(skb, queue_map);
2787         skb->priority = pkt_dev->skb_priority;
2788 
2789         memcpy(eth, pkt_dev->hh, 12);
2790         *(__be16 *) & eth[12] = protocol;
2791 
2792         /* Eth + IPh + UDPh + mpls */
2793         datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
2794                   pkt_dev->pkt_overhead;
2795         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr))
2796                 datalen = sizeof(struct pktgen_hdr);
2797 
2798         udph->source = htons(pkt_dev->cur_udp_src);
2799         udph->dest = htons(pkt_dev->cur_udp_dst);
2800         udph->len = htons(datalen + 8); /* DATA + udphdr */
2801         udph->check = 0;
2802 
2803         iph->ihl = 5;
2804         iph->version = 4;
2805         iph->ttl = 32;
2806         iph->tos = pkt_dev->tos;
2807         iph->protocol = IPPROTO_UDP;    /* UDP */
2808         iph->saddr = pkt_dev->cur_saddr;
2809         iph->daddr = pkt_dev->cur_daddr;
2810         iph->id = htons(pkt_dev->ip_id);
2811         pkt_dev->ip_id++;
2812         iph->frag_off = 0;
2813         iplen = 20 + 8 + datalen;
2814         iph->tot_len = htons(iplen);
2815         ip_send_check(iph);
2816         skb->protocol = protocol;
2817         skb->dev = odev;
2818         skb->pkt_type = PACKET_HOST;
2819 
2820         pktgen_finalize_skb(pkt_dev, skb, datalen);
2821 
2822         if (!(pkt_dev->flags & F_UDPCSUM)) {
2823                 skb->ip_summed = CHECKSUM_NONE;
2824         } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) {
2825                 skb->ip_summed = CHECKSUM_PARTIAL;
2826                 skb->csum = 0;
2827                 udp4_hwcsum(skb, iph->saddr, iph->daddr);
2828         } else {
2829                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0);
2830 
2831                 /* add protocol-dependent pseudo-header */
2832                 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
2833                                                 datalen + 8, IPPROTO_UDP, csum);
2834 
2835                 if (udph->check == 0)
2836                         udph->check = CSUM_MANGLED_0;
2837         }
2838 
2839 #ifdef CONFIG_XFRM
2840         if (!process_ipsec(pkt_dev, skb, protocol))
2841                 return NULL;
2842 #endif
2843 
2844         return skb;
2845 }
2846 
2847 static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
2848                                         struct pktgen_dev *pkt_dev)
2849 {
2850         struct sk_buff *skb = NULL;
2851         __u8 *eth;
2852         struct udphdr *udph;
2853         int datalen, udplen;
2854         struct ipv6hdr *iph;
2855         __be16 protocol = htons(ETH_P_IPV6);
2856         __be32 *mpls;
2857         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2858         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2859         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2860         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2861         u16 queue_map;
2862 
2863         if (pkt_dev->nr_labels)
2864                 protocol = htons(ETH_P_MPLS_UC);
2865 
2866         if (pkt_dev->vlan_id != 0xffff)
2867                 protocol = htons(ETH_P_8021Q);
2868 
2869         /* Update any of the values, used when we're incrementing various
2870          * fields.
2871          */
2872         mod_cur_headers(pkt_dev);
2873         queue_map = pkt_dev->cur_queue_map;
2874 
2875         skb = pktgen_alloc_skb(odev, pkt_dev);
2876         if (!skb) {
2877                 sprintf(pkt_dev->result, "No memory");
2878                 return NULL;
2879         }
2880 
2881         prefetchw(skb->data);
2882         skb_reserve(skb, 16);
2883 
2884         /*  Reserve for ethernet and IP header  */
2885         eth = skb_push(skb, 14);
2886         mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32));
2887         if (pkt_dev->nr_labels)
2888                 mpls_push(mpls, pkt_dev);
2889 
2890         if (pkt_dev->vlan_id != 0xffff) {
2891                 if (pkt_dev->svlan_id != 0xffff) {
2892                         svlan_tci = skb_put(skb, sizeof(__be16));
2893                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2894                                                pkt_dev->svlan_cfi,
2895                                                pkt_dev->svlan_p);
2896                         svlan_encapsulated_proto = skb_put(skb,
2897                                                            sizeof(__be16));
2898                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2899                 }
2900                 vlan_tci = skb_put(skb, sizeof(__be16));
2901                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2902                                       pkt_dev->vlan_cfi,
2903                                       pkt_dev->vlan_p);
2904                 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16));
2905                 *vlan_encapsulated_proto = htons(ETH_P_IPV6);
2906         }
2907 
2908         skb_reset_mac_header(skb);
2909         skb_set_network_header(skb, skb->len);
2910         iph = skb_put(skb, sizeof(struct ipv6hdr));
2911 
2912         skb_set_transport_header(skb, skb->len);
2913         udph = skb_put(skb, sizeof(struct udphdr));
2914         skb_set_queue_mapping(skb, queue_map);
2915         skb->priority = pkt_dev->skb_priority;
2916 
2917         memcpy(eth, pkt_dev->hh, 12);
2918         *(__be16 *) &eth[12] = protocol;
2919 
2920         /* Eth + IPh + UDPh + mpls */
2921         datalen = pkt_dev->cur_pkt_size - 14 -
2922                   sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
2923                   pkt_dev->pkt_overhead;
2924 
2925         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) {
2926                 datalen = sizeof(struct pktgen_hdr);
2927                 net_info_ratelimited("increased datalen to %d\n", datalen);
2928         }
2929 
2930         udplen = datalen + sizeof(struct udphdr);
2931         udph->source = htons(pkt_dev->cur_udp_src);
2932         udph->dest = htons(pkt_dev->cur_udp_dst);
2933         udph->len = htons(udplen);
2934         udph->check = 0;
2935 
2936         *(__be32 *) iph = htonl(0x60000000);    /* Version + flow */
2937 
2938         if (pkt_dev->traffic_class) {
2939                 /* Version + traffic class + flow (0) */
2940                 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20));
2941         }
2942 
2943         iph->hop_limit = 32;
2944 
2945         iph->payload_len = htons(udplen);
2946         iph->nexthdr = IPPROTO_UDP;
2947 
2948         iph->daddr = pkt_dev->cur_in6_daddr;
2949         iph->saddr = pkt_dev->cur_in6_saddr;
2950 
2951         skb->protocol = protocol;
2952         skb->dev = odev;
2953         skb->pkt_type = PACKET_HOST;
2954 
2955         pktgen_finalize_skb(pkt_dev, skb, datalen);
2956 
2957         if (!(pkt_dev->flags & F_UDPCSUM)) {
2958                 skb->ip_summed = CHECKSUM_NONE;
2959         } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM)) {
2960                 skb->ip_summed = CHECKSUM_PARTIAL;
2961                 skb->csum_start = skb_transport_header(skb) - skb->head;
2962                 skb->csum_offset = offsetof(struct udphdr, check);
2963                 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
2964         } else {
2965                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0);
2966 
2967                 /* add protocol-dependent pseudo-header */
2968                 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
2969 
2970                 if (udph->check == 0)
2971                         udph->check = CSUM_MANGLED_0;
2972         }
2973 
2974         return skb;
2975 }
2976 
2977 static struct sk_buff *fill_packet(struct net_device *odev,
2978                                    struct pktgen_dev *pkt_dev)
2979 {
2980         if (pkt_dev->flags & F_IPV6)
2981                 return fill_packet_ipv6(odev, pkt_dev);
2982         else
2983                 return fill_packet_ipv4(odev, pkt_dev);
2984 }
2985 
2986 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
2987 {
2988         pkt_dev->seq_num = 1;
2989         pkt_dev->idle_acc = 0;
2990         pkt_dev->sofar = 0;
2991         pkt_dev->tx_bytes = 0;
2992         pkt_dev->errors = 0;
2993 }
2994 
2995 /* Set up structure for sending pkts, clear counters */
2996 
2997 static void pktgen_run(struct pktgen_thread *t)
2998 {
2999         struct pktgen_dev *pkt_dev;
3000         int started = 0;
3001 
3002         func_enter();
3003 
3004         rcu_read_lock();
3005         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3006 
3007                 /*
3008                  * setup odev and create initial packet.
3009                  */
3010                 pktgen_setup_inject(pkt_dev);
3011 
3012                 if (pkt_dev->odev) {
3013                         pktgen_clear_counters(pkt_dev);
3014                         pkt_dev->skb = NULL;
3015                         pkt_dev->started_at = pkt_dev->next_tx = ktime_get();
3016 
3017                         set_pkt_overhead(pkt_dev);
3018 
3019                         strcpy(pkt_dev->result, "Starting");
3020                         pkt_dev->running = 1;   /* Cranke yeself! */
3021                         started++;
3022                 } else
3023                         strcpy(pkt_dev->result, "Error starting");
3024         }
3025         rcu_read_unlock();
3026         if (started)
3027                 t->control &= ~(T_STOP);
3028 }
3029 
3030 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn)
3031 {
3032         struct pktgen_thread *t;
3033 
3034         func_enter();
3035 
3036         mutex_lock(&pktgen_thread_lock);
3037 
3038         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3039                 t->control |= T_STOP;
3040 
3041         mutex_unlock(&pktgen_thread_lock);
3042 }
3043 
3044 static int thread_is_running(const struct pktgen_thread *t)
3045 {
3046         const struct pktgen_dev *pkt_dev;
3047 
3048         rcu_read_lock();
3049         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
3050                 if (pkt_dev->running) {
3051                         rcu_read_unlock();
3052                         return 1;
3053                 }
3054         rcu_read_unlock();
3055         return 0;
3056 }
3057 
3058 static int pktgen_wait_thread_run(struct pktgen_thread *t)
3059 {
3060         while (thread_is_running(t)) {
3061 
3062                 /* note: 't' will still be around even after the unlock/lock
3063                  * cycle because pktgen_thread threads are only cleared at
3064                  * net exit
3065                  */
3066                 mutex_unlock(&pktgen_thread_lock);
3067                 msleep_interruptible(100);
3068                 mutex_lock(&pktgen_thread_lock);
3069 
3070                 if (signal_pending(current))
3071                         goto signal;
3072         }
3073         return 1;
3074 signal:
3075         return 0;
3076 }
3077 
3078 static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
3079 {
3080         struct pktgen_thread *t;
3081         int sig = 1;
3082 
3083         /* prevent from racing with rmmod */
3084         if (!try_module_get(THIS_MODULE))
3085                 return sig;
3086 
3087         mutex_lock(&pktgen_thread_lock);
3088 
3089         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
3090                 sig = pktgen_wait_thread_run(t);
3091                 if (sig == 0)
3092                         break;
3093         }
3094 
3095         if (sig == 0)
3096                 list_for_each_entry(t, &pn->pktgen_threads, th_list)
3097                         t->control |= (T_STOP);
3098 
3099         mutex_unlock(&pktgen_thread_lock);
3100         module_put(THIS_MODULE);
3101         return sig;
3102 }
3103 
3104 static void pktgen_run_all_threads(struct pktgen_net *pn)
3105 {
3106         struct pktgen_thread *t;
3107 
3108         func_enter();
3109 
3110         mutex_lock(&pktgen_thread_lock);
3111 
3112         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3113                 t->control |= (T_RUN);
3114 
3115         mutex_unlock(&pktgen_thread_lock);
3116 
3117         /* Propagate thread->control  */
3118         schedule_timeout_interruptible(msecs_to_jiffies(125));
3119 
3120         pktgen_wait_all_threads_run(pn);
3121 }
3122 
3123 static void pktgen_reset_all_threads(struct pktgen_net *pn)
3124 {
3125         struct pktgen_thread *t;
3126 
3127         func_enter();
3128 
3129         mutex_lock(&pktgen_thread_lock);
3130 
3131         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3132                 t->control |= (T_REMDEVALL);
3133 
3134         mutex_unlock(&pktgen_thread_lock);
3135 
3136         /* Propagate thread->control  */
3137         schedule_timeout_interruptible(msecs_to_jiffies(125));
3138 
3139         pktgen_wait_all_threads_run(pn);
3140 }
3141 
3142 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
3143 {
3144         __u64 bps, mbps, pps;
3145         char *p = pkt_dev->result;
3146         ktime_t elapsed = ktime_sub(pkt_dev->stopped_at,
3147                                     pkt_dev->started_at);
3148         ktime_t idle = ns_to_ktime(pkt_dev->idle_acc);
3149 
3150         p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
3151                      (unsigned long long)ktime_to_us(elapsed),
3152                      (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)),
3153                      (unsigned long long)ktime_to_us(idle),
3154                      (unsigned long long)pkt_dev->sofar,
3155                      pkt_dev->cur_pkt_size, nr_frags);
3156 
3157         pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
3158                         ktime_to_ns(elapsed));
3159 
3160         bps = pps * 8 * pkt_dev->cur_pkt_size;
3161 
3162         mbps = bps;
3163         do_div(mbps, 1000000);
3164         p += sprintf(p, "  %llupps %lluMb/sec (%llubps) errors: %llu",
3165                      (unsigned long long)pps,
3166                      (unsigned long long)mbps,
3167                      (unsigned long long)bps,
3168                      (unsigned long long)pkt_dev->errors);
3169 }
3170 
3171 /* Set stopped-at timer, remove from running list, do counters & statistics */
3172 static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
3173 {
3174         int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1;
3175 
3176         if (!pkt_dev->running) {
3177                 pr_warn("interface: %s is already stopped\n",
3178                         pkt_dev->odevname);
3179                 return -EINVAL;
3180         }
3181 
3182         pkt_dev->running = 0;
3183         kfree_skb(pkt_dev->skb);
3184         pkt_dev->skb = NULL;
3185         pkt_dev->stopped_at = ktime_get();
3186 
3187         show_results(pkt_dev, nr_frags);
3188 
3189         return 0;
3190 }
3191 
3192 static struct pktgen_dev *next_to_run(struct pktgen_thread *t)
3193 {
3194         struct pktgen_dev *pkt_dev, *best = NULL;
3195 
3196         rcu_read_lock();
3197         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3198                 if (!pkt_dev->running)
3199                         continue;
3200                 if (best == NULL)
3201                         best = pkt_dev;
3202                 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0)
3203                         best = pkt_dev;
3204         }
3205         rcu_read_unlock();
3206 
3207         return best;
3208 }
3209 
3210 static void pktgen_stop(struct pktgen_thread *t)
3211 {
3212         struct pktgen_dev *pkt_dev;
3213 
3214         func_enter();
3215 
3216         rcu_read_lock();
3217 
3218         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3219                 pktgen_stop_device(pkt_dev);
3220         }
3221 
3222         rcu_read_unlock();
3223 }
3224 
3225 /*
3226  * one of our devices needs to be removed - find it
3227  * and remove it
3228  */
3229 static void pktgen_rem_one_if(struct pktgen_thread *t)
3230 {
3231         struct list_head *q, *n;
3232         struct pktgen_dev *cur;
3233 
3234         func_enter();
3235 
3236         list_for_each_safe(q, n, &t->if_list) {
3237                 cur = list_entry(q, struct pktgen_dev, list);
3238 
3239                 if (!cur->removal_mark)
3240                         continue;
3241 
3242                 kfree_skb(cur->skb);
3243                 cur->skb = NULL;
3244 
3245                 pktgen_remove_device(t, cur);
3246 
3247                 break;
3248         }
3249 }
3250 
3251 static void pktgen_rem_all_ifs(struct pktgen_thread *t)
3252 {
3253         struct list_head *q, *n;
3254         struct pktgen_dev *cur;
3255 
3256         func_enter();
3257 
3258         /* Remove all devices, free mem */
3259 
3260         list_for_each_safe(q, n, &t->if_list) {
3261                 cur = list_entry(q, struct pktgen_dev, list);
3262 
3263                 kfree_skb(cur->skb);
3264                 cur->skb = NULL;
3265 
3266                 pktgen_remove_device(t, cur);
3267         }
3268 }
3269 
3270 static void pktgen_rem_thread(struct pktgen_thread *t)
3271 {
3272         /* Remove from the thread list */
3273         remove_proc_entry(t->tsk->comm, t->net->proc_dir);
3274 }
3275 
3276 static void pktgen_resched(struct pktgen_dev *pkt_dev)
3277 {
3278         ktime_t idle_start = ktime_get();
3279         schedule();
3280         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3281 }
3282 
3283 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
3284 {
3285         ktime_t idle_start = ktime_get();
3286 
3287         while (refcount_read(&(pkt_dev->skb->users)) != 1) {
3288                 if (signal_pending(current))
3289                         break;
3290 
3291                 if (need_resched())
3292                         pktgen_resched(pkt_dev);
3293                 else
3294                         cpu_relax();
3295         }
3296         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3297 }
3298 
3299 static void pktgen_xmit(struct pktgen_dev *pkt_dev)
3300 {
3301         unsigned int burst = READ_ONCE(pkt_dev->burst);
3302         struct net_device *odev = pkt_dev->odev;
3303         struct netdev_queue *txq;
3304         struct sk_buff *skb;
3305         int ret;
3306 
3307         /* If device is offline, then don't send */
3308         if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) {
3309                 pktgen_stop_device(pkt_dev);
3310                 return;
3311         }
3312 
3313         /* This is max DELAY, this has special meaning of
3314          * "never transmit"
3315          */
3316         if (unlikely(pkt_dev->delay == ULLONG_MAX)) {
3317                 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX);
3318                 return;
3319         }
3320 
3321         /* If no skb or clone count exhausted then get new one */
3322         if (!pkt_dev->skb || (pkt_dev->last_ok &&
3323                               ++pkt_dev->clone_count >= pkt_dev->clone_skb)) {
3324                 /* build a new pkt */
3325                 kfree_skb(pkt_dev->skb);
3326 
3327                 pkt_dev->skb = fill_packet(odev, pkt_dev);
3328                 if (pkt_dev->skb == NULL) {
3329                         pr_err("ERROR: couldn't allocate skb in fill_packet\n");
3330                         schedule();
3331                         pkt_dev->clone_count--; /* back out increment, OOM */
3332                         return;
3333                 }
3334                 pkt_dev->last_pkt_size = pkt_dev->skb->len;
3335                 pkt_dev->clone_count = 0;       /* reset counter */
3336         }
3337 
3338         if (pkt_dev->delay && pkt_dev->last_ok)
3339                 spin(pkt_dev, pkt_dev->next_tx);
3340 
3341         if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) {
3342                 skb = pkt_dev->skb;
3343                 skb->protocol = eth_type_trans(skb, skb->dev);
3344                 refcount_add(burst, &skb->users);
3345                 local_bh_disable();
3346                 do {
3347                         ret = netif_receive_skb(skb);
3348                         if (ret == NET_RX_DROP)
3349                                 pkt_dev->errors++;
3350                         pkt_dev->sofar++;
3351                         pkt_dev->seq_num++;
3352                         if (refcount_read(&skb->users) != burst) {
3353                                 /* skb was queued by rps/rfs or taps,
3354                                  * so cannot reuse this skb
3355                                  */
3356                                 WARN_ON(refcount_sub_and_test(burst - 1, &skb->users));
3357                                 /* get out of the loop and wait
3358                                  * until skb is consumed
3359                                  */
3360                                 break;
3361                         }
3362                         /* skb was 'freed' by stack, so clean few
3363                          * bits and reuse it
3364                          */
3365                         skb_reset_tc(skb);
3366                 } while (--burst > 0);
3367                 goto out; /* Skips xmit_mode M_START_XMIT */
3368         } else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) {
3369                 local_bh_disable();
3370                 refcount_inc(&pkt_dev->skb->users);
3371 
3372                 ret = dev_queue_xmit(pkt_dev->skb);
3373                 switch (ret) {
3374                 case NET_XMIT_SUCCESS:
3375                         pkt_dev->sofar++;
3376                         pkt_dev->seq_num++;
3377                         pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3378                         break;
3379                 case NET_XMIT_DROP:
3380                 case NET_XMIT_CN:
3381                 /* These are all valid return codes for a qdisc but
3382                  * indicate packets are being dropped or will likely
3383                  * be dropped soon.
3384                  */
3385                 case NETDEV_TX_BUSY:
3386                 /* qdisc may call dev_hard_start_xmit directly in cases
3387                  * where no queues exist e.g. loopback device, virtual
3388                  * devices, etc. In this case we need to handle
3389                  * NETDEV_TX_ codes.
3390                  */
3391                 default:
3392                         pkt_dev->errors++;
3393                         net_info_ratelimited("%s xmit error: %d\n",
3394                                              pkt_dev->odevname, ret);
3395                         break;
3396                 }
3397                 goto out;
3398         }
3399 
3400         txq = skb_get_tx_queue(odev, pkt_dev->skb);
3401 
3402         local_bh_disable();
3403 
3404         HARD_TX_LOCK(odev, txq, smp_processor_id());
3405 
3406         if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) {
3407                 ret = NETDEV_TX_BUSY;
3408                 pkt_dev->last_ok = 0;
3409                 goto unlock;
3410         }
3411         refcount_add(burst, &pkt_dev->skb->users);
3412 
3413 xmit_more:
3414         ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0);
3415 
3416         switch (ret) {
3417         case NETDEV_TX_OK:
3418                 pkt_dev->last_ok = 1;
3419                 pkt_dev->sofar++;
3420                 pkt_dev->seq_num++;
3421                 pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3422                 if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq))
3423                         goto xmit_more;
3424                 break;
3425         case NET_XMIT_DROP:
3426         case NET_XMIT_CN:
3427                 /* skb has been consumed */
3428                 pkt_dev->errors++;
3429                 break;
3430         default: /* Drivers are not supposed to return other values! */
3431                 net_info_ratelimited("%s xmit error: %d\n",
3432                                      pkt_dev->odevname, ret);
3433                 pkt_dev->errors++;
3434                 /* fall through */
3435         case NETDEV_TX_BUSY:
3436                 /* Retry it next time */
3437                 refcount_dec(&(pkt_dev->skb->users));
3438                 pkt_dev->last_ok = 0;
3439         }
3440         if (unlikely(burst))
3441                 WARN_ON(refcount_sub_and_test(burst, &pkt_dev->skb->users));
3442 unlock:
3443         HARD_TX_UNLOCK(odev, txq);
3444 
3445 out:
3446         local_bh_enable();
3447 
3448         /* If pkt_dev->count is zero, then run forever */
3449         if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
3450                 pktgen_wait_for_skb(pkt_dev);
3451 
3452                 /* Done with this */
3453                 pktgen_stop_device(pkt_dev);
3454         }
3455 }
3456 
3457 /*
3458  * Main loop of the thread goes here
3459  */
3460 
3461 static int pktgen_thread_worker(void *arg)
3462 {
3463         DEFINE_WAIT(wait);
3464         struct pktgen_thread *t = arg;
3465         struct pktgen_dev *pkt_dev = NULL;
3466         int cpu = t->cpu;
3467 
3468         BUG_ON(smp_processor_id() != cpu);
3469 
3470         init_waitqueue_head(&t->queue);
3471         complete(&t->start_done);
3472 
3473         pr_debug("starting pktgen/%d:  pid=%d\n", cpu, task_pid_nr(current));
3474 
3475         set_freezable();
3476 
3477         while (!kthread_should_stop()) {
3478                 pkt_dev = next_to_run(t);
3479 
3480                 if (unlikely(!pkt_dev && t->control == 0)) {
3481                         if (t->net->pktgen_exiting)
3482                                 break;
3483                         wait_event_interruptible_timeout(t->queue,
3484                                                          t->control != 0,
3485                                                          HZ/10);
3486                         try_to_freeze();
3487                         continue;
3488                 }
3489 
3490                 if (likely(pkt_dev)) {
3491                         pktgen_xmit(pkt_dev);
3492 
3493                         if (need_resched())
3494                                 pktgen_resched(pkt_dev);
3495                         else
3496                                 cpu_relax();
3497                 }
3498 
3499                 if (t->control & T_STOP) {
3500                         pktgen_stop(t);
3501                         t->control &= ~(T_STOP);
3502                 }
3503 
3504                 if (t->control & T_RUN) {
3505                         pktgen_run(t);
3506                         t->control &= ~(T_RUN);
3507                 }
3508 
3509                 if (t->control & T_REMDEVALL) {
3510                         pktgen_rem_all_ifs(t);
3511                         t->control &= ~(T_REMDEVALL);
3512                 }
3513 
3514                 if (t->control & T_REMDEV) {
3515                         pktgen_rem_one_if(t);
3516                         t->control &= ~(T_REMDEV);
3517                 }
3518 
3519                 try_to_freeze();
3520         }
3521 
3522         pr_debug("%s stopping all device\n", t->tsk->comm);
3523         pktgen_stop(t);
3524 
3525         pr_debug("%s removing all device\n", t->tsk->comm);
3526         pktgen_rem_all_ifs(t);
3527 
3528         pr_debug("%s removing thread\n", t->tsk->comm);
3529         pktgen_rem_thread(t);
3530 
3531         return 0;
3532 }
3533 
3534 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
3535                                           const char *ifname, bool exact)
3536 {
3537         struct pktgen_dev *p, *pkt_dev = NULL;
3538         size_t len = strlen(ifname);
3539 
3540         rcu_read_lock();
3541         list_for_each_entry_rcu(p, &t->if_list, list)
3542                 if (strncmp(p->odevname, ifname, len) == 0) {
3543                         if (p->odevname[len]) {
3544                                 if (exact || p->odevname[len] != '@')
3545                                         continue;
3546                         }
3547                         pkt_dev = p;
3548                         break;
3549                 }
3550 
3551         rcu_read_unlock();
3552         pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev);
3553         return pkt_dev;
3554 }
3555 
3556 /*
3557  * Adds a dev at front of if_list.
3558  */
3559 
3560 static int add_dev_to_thread(struct pktgen_thread *t,
3561                              struct pktgen_dev *pkt_dev)
3562 {
3563         int rv = 0;
3564 
3565         /* This function cannot be called concurrently, as its called
3566          * under pktgen_thread_lock mutex, but it can run from
3567          * userspace on another CPU than the kthread.  The if_lock()
3568          * is used here to sync with concurrent instances of
3569          * _rem_dev_from_if_list() invoked via kthread, which is also
3570          * updating the if_list */
3571         if_lock(t);
3572 
3573         if (pkt_dev->pg_thread) {
3574                 pr_err("ERROR: already assigned to a thread\n");
3575                 rv = -EBUSY;
3576                 goto out;
3577         }
3578 
3579         pkt_dev->running = 0;
3580         pkt_dev->pg_thread = t;
3581         list_add_rcu(&pkt_dev->list, &t->if_list);
3582 
3583 out:
3584         if_unlock(t);
3585         return rv;
3586 }
3587 
3588 /* Called under thread lock */
3589 
3590 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
3591 {
3592         struct pktgen_dev *pkt_dev;
3593         int err;
3594         int node = cpu_to_node(t->cpu);
3595 
3596         /* We don't allow a device to be on several threads */
3597 
3598         pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND);
3599         if (pkt_dev) {
3600                 pr_err("ERROR: interface already used\n");
3601                 return -EBUSY;
3602         }
3603 
3604         pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node);
3605         if (!pkt_dev)
3606                 return -ENOMEM;
3607 
3608         strcpy(pkt_dev->odevname, ifname);
3609         pkt_dev->flows = vzalloc_node(array_size(MAX_CFLOWS,
3610                                                  sizeof(struct flow_state)),
3611                                       node);
3612         if (pkt_dev->flows == NULL) {
3613                 kfree(pkt_dev);
3614                 return -ENOMEM;
3615         }
3616 
3617         pkt_dev->removal_mark = 0;
3618         pkt_dev->nfrags = 0;
3619         pkt_dev->delay = pg_delay_d;
3620         pkt_dev->count = pg_count_d;
3621         pkt_dev->sofar = 0;
3622         pkt_dev->udp_src_min = 9;       /* sink port */
3623         pkt_dev->udp_src_max = 9;
3624         pkt_dev->udp_dst_min = 9;
3625         pkt_dev->udp_dst_max = 9;
3626         pkt_dev->vlan_p = 0;
3627         pkt_dev->vlan_cfi = 0;
3628         pkt_dev->vlan_id = 0xffff;
3629         pkt_dev->svlan_p = 0;
3630         pkt_dev->svlan_cfi = 0;
3631         pkt_dev->svlan_id = 0xffff;
3632         pkt_dev->burst = 1;
3633         pkt_dev->node = NUMA_NO_NODE;
3634 
3635         err = pktgen_setup_dev(t->net, pkt_dev, ifname);
3636         if (err)
3637                 goto out1;
3638         if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)
3639                 pkt_dev->clone_skb = pg_clone_skb_d;
3640 
3641         pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir,
3642                                           &pktgen_if_fops, pkt_dev);
3643         if (!pkt_dev->entry) {
3644                 pr_err("cannot create %s/%s procfs entry\n",
3645                        PG_PROC_DIR, ifname);
3646                 err = -EINVAL;
3647                 goto out2;
3648         }
3649 #ifdef CONFIG_XFRM
3650         pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
3651         pkt_dev->ipsproto = IPPROTO_ESP;
3652 
3653         /* xfrm tunnel mode needs additional dst to extract outter
3654          * ip header protocol/ttl/id field, here creat a phony one.
3655          * instead of looking for a valid rt, which definitely hurting
3656          * performance under such circumstance.
3657          */
3658         pkt_dev->dstops.family = AF_INET;
3659         pkt_dev->xdst.u.dst.dev = pkt_dev->odev;
3660         dst_init_metrics(&pkt_dev->xdst.u.dst, pktgen_dst_metrics, false);
3661         pkt_dev->xdst.child = &pkt_dev->xdst.u.dst;
3662         pkt_dev->xdst.u.dst.ops = &pkt_dev->dstops;
3663 #endif
3664 
3665         return add_dev_to_thread(t, pkt_dev);
3666 out2:
3667         dev_put(pkt_dev->odev);
3668 out1:
3669 #ifdef CONFIG_XFRM
3670         free_SAs(pkt_dev);
3671 #endif
3672         vfree(pkt_dev->flows);
3673         kfree(pkt_dev);
3674         return err;
3675 }
3676 
3677 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
3678 {
3679         struct pktgen_thread *t;
3680         struct proc_dir_entry *pe;
3681         struct task_struct *p;
3682 
3683         t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL,
3684                          cpu_to_node(cpu));
3685         if (!t) {
3686                 pr_err("ERROR: out of memory, can't create new thread\n");
3687                 return -ENOMEM;
3688         }
3689 
3690         mutex_init(&t->if_lock);
3691         t->cpu = cpu;
3692 
3693         INIT_LIST_HEAD(&t->if_list);
3694 
3695         list_add_tail(&t->th_list, &pn->pktgen_threads);
3696         init_completion(&t->start_done);
3697 
3698         p = kthread_create_on_node(pktgen_thread_worker,
3699                                    t,
3700                                    cpu_to_node(cpu),
3701                                    "kpktgend_%d", cpu);
3702         if (IS_ERR(p)) {
3703                 pr_err("kernel_thread() failed for cpu %d\n", t->cpu);
3704                 list_del(&t->th_list);
3705                 kfree(t);
3706                 return PTR_ERR(p);
3707         }
3708         kthread_bind(p, cpu);
3709         t->tsk = p;
3710 
3711         pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir,
3712                               &pktgen_thread_fops, t);
3713         if (!pe) {
3714                 pr_err("cannot create %s/%s procfs entry\n",
3715                        PG_PROC_DIR, t->tsk->comm);
3716                 kthread_stop(p);
3717                 list_del(&t->th_list);
3718                 kfree(t);
3719                 return -EINVAL;
3720         }
3721 
3722         t->net = pn;
3723         get_task_struct(p);
3724         wake_up_process(p);
3725         wait_for_completion(&t->start_done);
3726 
3727         return 0;
3728 }
3729 
3730 /*
3731  * Removes a device from the thread if_list.
3732  */
3733 static void _rem_dev_from_if_list(struct pktgen_thread *t,
3734                                   struct pktgen_dev *pkt_dev)
3735 {
3736         struct list_head *q, *n;
3737         struct pktgen_dev *p;
3738 
3739         if_lock(t);
3740         list_for_each_safe(q, n, &t->if_list) {
3741                 p = list_entry(q, struct pktgen_dev, list);
3742                 if (p == pkt_dev)
3743                         list_del_rcu(&p->list);
3744         }
3745         if_unlock(t);
3746 }
3747 
3748 static int pktgen_remove_device(struct pktgen_thread *t,
3749                                 struct pktgen_dev *pkt_dev)
3750 {
3751         pr_debug("remove_device pkt_dev=%p\n", pkt_dev);
3752 
3753         if (pkt_dev->running) {
3754                 pr_warn("WARNING: trying to remove a running interface, stopping it now\n");
3755                 pktgen_stop_device(pkt_dev);
3756         }
3757 
3758         /* Dis-associate from the interface */
3759 
3760         if (pkt_dev->odev) {
3761                 dev_put(pkt_dev->odev);
3762                 pkt_dev->odev = NULL;
3763         }
3764 
3765         /* Remove proc before if_list entry, because add_device uses
3766          * list to determine if interface already exist, avoid race
3767          * with proc_create_data() */
3768         proc_remove(pkt_dev->entry);
3769 
3770         /* And update the thread if_list */
3771         _rem_dev_from_if_list(t, pkt_dev);
3772 
3773 #ifdef CONFIG_XFRM
3774         free_SAs(pkt_dev);
3775 #endif
3776         vfree(pkt_dev->flows);
3777         if (pkt_dev->page)
3778                 put_page(pkt_dev->page);
3779         kfree_rcu(pkt_dev, rcu);
3780         return 0;
3781 }
3782 
3783 static int __net_init pg_net_init(struct net *net)
3784 {
3785         struct pktgen_net *pn = net_generic(net, pg_net_id);
3786         struct proc_dir_entry *pe;
3787         int cpu, ret = 0;
3788 
3789         pn->net = net;
3790         INIT_LIST_HEAD(&pn->pktgen_threads);
3791         pn->pktgen_exiting = false;
3792         pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net);
3793         if (!pn->proc_dir) {
3794                 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR);
3795                 return -ENODEV;
3796         }
3797         pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_fops);
3798         if (pe == NULL) {
3799                 pr_err("cannot create %s procfs entry\n", PGCTRL);
3800                 ret = -EINVAL;
3801                 goto remove;
3802         }
3803 
3804         for_each_online_cpu(cpu) {
3805                 int err;
3806 
3807                 err = pktgen_create_thread(cpu, pn);
3808                 if (err)
3809                         pr_warn("Cannot create thread for cpu %d (%d)\n",
3810                                    cpu, err);
3811         }
3812 
3813         if (list_empty(&pn->pktgen_threads)) {
3814                 pr_err("Initialization failed for all threads\n");
3815                 ret = -ENODEV;
3816                 goto remove_entry;
3817         }
3818 
3819         return 0;
3820 
3821 remove_entry:
3822         remove_proc_entry(PGCTRL, pn->proc_dir);
3823 remove:
3824         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3825         return ret;
3826 }
3827 
3828 static void __net_exit pg_net_exit(struct net *net)
3829 {
3830         struct pktgen_net *pn = net_generic(net, pg_net_id);
3831         struct pktgen_thread *t;
3832         struct list_head *q, *n;
3833         LIST_HEAD(list);
3834 
3835         /* Stop all interfaces & threads */
3836         pn->pktgen_exiting = true;
3837 
3838         mutex_lock(&pktgen_thread_lock);
3839         list_splice_init(&pn->pktgen_threads, &list);
3840         mutex_unlock(&pktgen_thread_lock);
3841 
3842         list_for_each_safe(q, n, &list) {
3843                 t = list_entry(q, struct pktgen_thread, th_list);
3844                 list_del(&t->th_list);
3845                 kthread_stop(t->tsk);
3846                 put_task_struct(t->tsk);
3847                 kfree(t);
3848         }
3849 
3850         remove_proc_entry(PGCTRL, pn->proc_dir);
3851         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3852 }
3853 
3854 static struct pernet_operations pg_net_ops = {
3855         .init = pg_net_init,
3856         .exit = pg_net_exit,
3857         .id   = &pg_net_id,
3858         .size = sizeof(struct pktgen_net),
3859 };
3860 
3861 static int __init pg_init(void)
3862 {
3863         int ret = 0;
3864 
3865         pr_info("%s", version);
3866         ret = register_pernet_subsys(&pg_net_ops);
3867         if (ret)
3868                 return ret;
3869         ret = register_netdevice_notifier(&pktgen_notifier_block);
3870         if (ret)
3871                 unregister_pernet_subsys(&pg_net_ops);
3872 
3873         return ret;
3874 }
3875 
3876 static void __exit pg_cleanup(void)
3877 {
3878         unregister_netdevice_notifier(&pktgen_notifier_block);
3879         unregister_pernet_subsys(&pg_net_ops);
3880         /* Don't need rcu_barrier() due to use of kfree_rcu() */
3881 }
3882 
3883 module_init(pg_init);
3884 module_exit(pg_cleanup);
3885 
3886 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
3887 MODULE_DESCRIPTION("Packet Generator tool");
3888 MODULE_LICENSE("GPL");
3889 MODULE_VERSION(VERSION);
3890 module_param(pg_count_d, int, 0);
3891 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
3892 module_param(pg_delay_d, int, 0);
3893 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
3894 module_param(pg_clone_skb_d, int, 0);
3895 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
3896 module_param(debug, int, 0);
3897 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");
3898 

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