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Linux/net/sctp/probe.c

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  1 /*
  2  * sctp_probe - Observe the SCTP flow with kprobes.
  3  *
  4  * The idea for this came from Werner Almesberger's umlsim
  5  * Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
  6  *
  7  * Modified for SCTP from Stephen Hemminger's code
  8  * Copyright (C) 2010, Wei Yongjun <yjwei@cn.fujitsu.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 23  */
 24 
 25 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 26 
 27 #include <linux/kernel.h>
 28 #include <linux/kprobes.h>
 29 #include <linux/socket.h>
 30 #include <linux/sctp.h>
 31 #include <linux/proc_fs.h>
 32 #include <linux/vmalloc.h>
 33 #include <linux/module.h>
 34 #include <linux/kfifo.h>
 35 #include <linux/time.h>
 36 #include <net/net_namespace.h>
 37 
 38 #include <net/sctp/sctp.h>
 39 #include <net/sctp/sm.h>
 40 
 41 MODULE_SOFTDEP("pre: sctp");
 42 MODULE_AUTHOR("Wei Yongjun <yjwei@cn.fujitsu.com>");
 43 MODULE_DESCRIPTION("SCTP snooper");
 44 MODULE_LICENSE("GPL");
 45 
 46 static int port __read_mostly = 0;
 47 MODULE_PARM_DESC(port, "Port to match (0=all)");
 48 module_param(port, int, 0);
 49 
 50 static unsigned int fwmark __read_mostly = 0;
 51 MODULE_PARM_DESC(fwmark, "skb mark to match (0=no mark)");
 52 module_param(fwmark, uint, 0);
 53 
 54 static int bufsize __read_mostly = 64 * 1024;
 55 MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
 56 module_param(bufsize, int, 0);
 57 
 58 static int full __read_mostly = 1;
 59 MODULE_PARM_DESC(full, "Full log (1=every ack packet received,  0=only cwnd changes)");
 60 module_param(full, int, 0);
 61 
 62 static const char procname[] = "sctpprobe";
 63 
 64 static struct {
 65         struct kfifo      fifo;
 66         spinlock_t        lock;
 67         wait_queue_head_t wait;
 68         struct timespec   tstart;
 69 } sctpw;
 70 
 71 static __printf(1, 2) void printl(const char *fmt, ...)
 72 {
 73         va_list args;
 74         int len;
 75         char tbuf[256];
 76 
 77         va_start(args, fmt);
 78         len = vscnprintf(tbuf, sizeof(tbuf), fmt, args);
 79         va_end(args);
 80 
 81         kfifo_in_locked(&sctpw.fifo, tbuf, len, &sctpw.lock);
 82         wake_up(&sctpw.wait);
 83 }
 84 
 85 static int sctpprobe_open(struct inode *inode, struct file *file)
 86 {
 87         kfifo_reset(&sctpw.fifo);
 88         getnstimeofday(&sctpw.tstart);
 89 
 90         return 0;
 91 }
 92 
 93 static ssize_t sctpprobe_read(struct file *file, char __user *buf,
 94                               size_t len, loff_t *ppos)
 95 {
 96         int error = 0, cnt = 0;
 97         unsigned char *tbuf;
 98 
 99         if (!buf)
100                 return -EINVAL;
101 
102         if (len == 0)
103                 return 0;
104 
105         tbuf = vmalloc(len);
106         if (!tbuf)
107                 return -ENOMEM;
108 
109         error = wait_event_interruptible(sctpw.wait,
110                                          kfifo_len(&sctpw.fifo) != 0);
111         if (error)
112                 goto out_free;
113 
114         cnt = kfifo_out_locked(&sctpw.fifo, tbuf, len, &sctpw.lock);
115         error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
116 
117 out_free:
118         vfree(tbuf);
119 
120         return error ? error : cnt;
121 }
122 
123 static const struct file_operations sctpprobe_fops = {
124         .owner  = THIS_MODULE,
125         .open   = sctpprobe_open,
126         .read   = sctpprobe_read,
127         .llseek = noop_llseek,
128 };
129 
130 static sctp_disposition_t jsctp_sf_eat_sack(struct net *net,
131                                             const struct sctp_endpoint *ep,
132                                             const struct sctp_association *asoc,
133                                             const sctp_subtype_t type,
134                                             void *arg,
135                                             sctp_cmd_seq_t *commands)
136 {
137         struct sctp_chunk *chunk = arg;
138         struct sk_buff *skb = chunk->skb;
139         struct sctp_transport *sp;
140         static __u32 lcwnd = 0;
141         struct timespec now;
142 
143         sp = asoc->peer.primary_path;
144 
145         if (((port == 0 && fwmark == 0) ||
146              asoc->peer.port == port ||
147              ep->base.bind_addr.port == port ||
148              (fwmark > 0 && skb->mark == fwmark)) &&
149             (full || sp->cwnd != lcwnd)) {
150                 lcwnd = sp->cwnd;
151 
152                 getnstimeofday(&now);
153                 now = timespec_sub(now, sctpw.tstart);
154 
155                 printl("%lu.%06lu ", (unsigned long) now.tv_sec,
156                        (unsigned long) now.tv_nsec / NSEC_PER_USEC);
157 
158                 printl("%p %5d %5d %5d %8d %5d ", asoc,
159                        ep->base.bind_addr.port, asoc->peer.port,
160                        asoc->pathmtu, asoc->peer.rwnd, asoc->unack_data);
161 
162                 list_for_each_entry(sp, &asoc->peer.transport_addr_list,
163                                         transports) {
164                         if (sp == asoc->peer.primary_path)
165                                 printl("*");
166 
167                         printl("%pISc %2u %8u %8u %8u %8u %8u ",
168                                &sp->ipaddr, sp->state, sp->cwnd, sp->ssthresh,
169                                sp->flight_size, sp->partial_bytes_acked,
170                                sp->pathmtu);
171                 }
172                 printl("\n");
173         }
174 
175         jprobe_return();
176         return 0;
177 }
178 
179 static struct jprobe sctp_recv_probe = {
180         .kp     = {
181                 .symbol_name = "sctp_sf_eat_sack_6_2",
182         },
183         .entry  = jsctp_sf_eat_sack,
184 };
185 
186 static __init int sctp_setup_jprobe(void)
187 {
188         int ret = register_jprobe(&sctp_recv_probe);
189 
190         if (ret) {
191                 if (request_module("sctp"))
192                         goto out;
193                 ret = register_jprobe(&sctp_recv_probe);
194         }
195 
196 out:
197         return ret;
198 }
199 
200 static __init int sctpprobe_init(void)
201 {
202         int ret = -ENOMEM;
203 
204         /* Warning: if the function signature of sctp_sf_eat_sack_6_2,
205          * has been changed, you also have to change the signature of
206          * jsctp_sf_eat_sack, otherwise you end up right here!
207          */
208         BUILD_BUG_ON(__same_type(sctp_sf_eat_sack_6_2,
209                                  jsctp_sf_eat_sack) == 0);
210 
211         init_waitqueue_head(&sctpw.wait);
212         spin_lock_init(&sctpw.lock);
213         if (kfifo_alloc(&sctpw.fifo, bufsize, GFP_KERNEL))
214                 return ret;
215 
216         if (!proc_create(procname, S_IRUSR, init_net.proc_net,
217                          &sctpprobe_fops))
218                 goto free_kfifo;
219 
220         ret = sctp_setup_jprobe();
221         if (ret)
222                 goto remove_proc;
223 
224         pr_info("probe registered (port=%d/fwmark=%u) bufsize=%u\n",
225                 port, fwmark, bufsize);
226         return 0;
227 
228 remove_proc:
229         remove_proc_entry(procname, init_net.proc_net);
230 free_kfifo:
231         kfifo_free(&sctpw.fifo);
232         return ret;
233 }
234 
235 static __exit void sctpprobe_exit(void)
236 {
237         kfifo_free(&sctpw.fifo);
238         remove_proc_entry(procname, init_net.proc_net);
239         unregister_jprobe(&sctp_recv_probe);
240 }
241 
242 module_init(sctpprobe_init);
243 module_exit(sctpprobe_exit);
244 

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