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Linux/net/dccp/probe.c

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  1 /*
  2  * dccp_probe - Observe the DCCP 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 DCCP from Stephen Hemminger's code
  8  * Copyright (C) 2006, Ian McDonald <ian.mcdonald@jandi.co.nz>
  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 #include <linux/kernel.h>
 26 #include <linux/kprobes.h>
 27 #include <linux/socket.h>
 28 #include <linux/dccp.h>
 29 #include <linux/proc_fs.h>
 30 #include <linux/module.h>
 31 #include <linux/kfifo.h>
 32 #include <linux/vmalloc.h>
 33 #include <linux/gfp.h>
 34 #include <net/net_namespace.h>
 35 
 36 #include "dccp.h"
 37 #include "ccid.h"
 38 #include "ccids/ccid3.h"
 39 
 40 static int port;
 41 
 42 static int bufsize = 64 * 1024;
 43 
 44 static const char procname[] = "dccpprobe";
 45 
 46 static struct {
 47         struct kfifo      fifo;
 48         spinlock_t        lock;
 49         wait_queue_head_t wait;
 50         struct timespec   tstart;
 51 } dccpw;
 52 
 53 static void printl(const char *fmt, ...)
 54 {
 55         va_list args;
 56         int len;
 57         struct timespec now;
 58         char tbuf[256];
 59 
 60         va_start(args, fmt);
 61         getnstimeofday(&now);
 62 
 63         now = timespec_sub(now, dccpw.tstart);
 64 
 65         len = sprintf(tbuf, "%lu.%06lu ",
 66                       (unsigned long) now.tv_sec,
 67                       (unsigned long) now.tv_nsec / NSEC_PER_USEC);
 68         len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
 69         va_end(args);
 70 
 71         kfifo_in_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
 72         wake_up(&dccpw.wait);
 73 }
 74 
 75 static int jdccp_sendmsg(struct kiocb *iocb, struct sock *sk,
 76                          struct msghdr *msg, size_t size)
 77 {
 78         const struct inet_sock *inet = inet_sk(sk);
 79         struct ccid3_hc_tx_sock *hc = NULL;
 80 
 81         if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
 82                 hc = ccid3_hc_tx_sk(sk);
 83 
 84         if (port == 0 || ntohs(inet->inet_dport) == port ||
 85             ntohs(inet->inet_sport) == port) {
 86                 if (hc)
 87                         printl("%pI4:%u %pI4:%u %d %d %d %d %u %llu %llu %d\n",
 88                                &inet->inet_saddr, ntohs(inet->inet_sport),
 89                                &inet->inet_daddr, ntohs(inet->inet_dport), size,
 90                                hc->tx_s, hc->tx_rtt, hc->tx_p,
 91                                hc->tx_x_calc, hc->tx_x_recv >> 6,
 92                                hc->tx_x >> 6, hc->tx_t_ipi);
 93                 else
 94                         printl("%pI4:%u %pI4:%u %d\n",
 95                                &inet->inet_saddr, ntohs(inet->inet_sport),
 96                                &inet->inet_daddr, ntohs(inet->inet_dport),
 97                                size);
 98         }
 99 
100         jprobe_return();
101         return 0;
102 }
103 
104 static struct jprobe dccp_send_probe = {
105         .kp     = {
106                 .symbol_name = "dccp_sendmsg",
107         },
108         .entry  = jdccp_sendmsg,
109 };
110 
111 static int dccpprobe_open(struct inode *inode, struct file *file)
112 {
113         kfifo_reset(&dccpw.fifo);
114         getnstimeofday(&dccpw.tstart);
115         return 0;
116 }
117 
118 static ssize_t dccpprobe_read(struct file *file, char __user *buf,
119                               size_t len, loff_t *ppos)
120 {
121         int error = 0, cnt = 0;
122         unsigned char *tbuf;
123 
124         if (!buf)
125                 return -EINVAL;
126 
127         if (len == 0)
128                 return 0;
129 
130         tbuf = vmalloc(len);
131         if (!tbuf)
132                 return -ENOMEM;
133 
134         error = wait_event_interruptible(dccpw.wait,
135                                          kfifo_len(&dccpw.fifo) != 0);
136         if (error)
137                 goto out_free;
138 
139         cnt = kfifo_out_locked(&dccpw.fifo, tbuf, len, &dccpw.lock);
140         error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0;
141 
142 out_free:
143         vfree(tbuf);
144 
145         return error ? error : cnt;
146 }
147 
148 static const struct file_operations dccpprobe_fops = {
149         .owner   = THIS_MODULE,
150         .open    = dccpprobe_open,
151         .read    = dccpprobe_read,
152         .llseek  = noop_llseek,
153 };
154 
155 static __init int setup_jprobe(void)
156 {
157         int ret = register_jprobe(&dccp_send_probe);
158 
159         if (ret) {
160                 request_module("dccp");
161                 ret = register_jprobe(&dccp_send_probe);
162         }
163         return ret;
164 }
165 
166 static __init int dccpprobe_init(void)
167 {
168         int ret = -ENOMEM;
169 
170         init_waitqueue_head(&dccpw.wait);
171         spin_lock_init(&dccpw.lock);
172         if (kfifo_alloc(&dccpw.fifo, bufsize, GFP_KERNEL))
173                 return ret;
174         if (!proc_create(procname, S_IRUSR, init_net.proc_net, &dccpprobe_fops))
175                 goto err0;
176 
177         ret = setup_jprobe();
178         if (ret)
179                 goto err1;
180 
181         pr_info("DCCP watch registered (port=%d)\n", port);
182         return 0;
183 err1:
184         remove_proc_entry(procname, init_net.proc_net);
185 err0:
186         kfifo_free(&dccpw.fifo);
187         return ret;
188 }
189 module_init(dccpprobe_init);
190 
191 static __exit void dccpprobe_exit(void)
192 {
193         kfifo_free(&dccpw.fifo);
194         remove_proc_entry(procname, init_net.proc_net);
195         unregister_jprobe(&dccp_send_probe);
196 
197 }
198 module_exit(dccpprobe_exit);
199 
200 MODULE_PARM_DESC(port, "Port to match (0=all)");
201 module_param(port, int, 0);
202 
203 MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
204 module_param(bufsize, int, 0);
205 
206 MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>");
207 MODULE_DESCRIPTION("DCCP snooper");
208 MODULE_LICENSE("GPL");
209 

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