diff options
Diffstat (limited to 'net')
-rw-r--r-- | net/dccp/Kconfig | 16 | ||||
-rw-r--r-- | net/dccp/Makefile | 2 | ||||
-rw-r--r-- | net/dccp/probe.c | 198 |
3 files changed, 216 insertions, 0 deletions
diff --git a/net/dccp/Kconfig b/net/dccp/Kconfig index 859e3359fcda..e2a095d0fd80 100644 --- a/net/dccp/Kconfig +++ b/net/dccp/Kconfig | |||
@@ -40,6 +40,22 @@ config IP_DCCP_DEBUG | |||
40 | 40 | ||
41 | Just say N. | 41 | Just say N. |
42 | 42 | ||
43 | config NET_DCCPPROBE | ||
44 | tristate "DCCP connection probing" | ||
45 | depends on PROC_FS && KPROBES | ||
46 | ---help--- | ||
47 | This module allows for capturing the changes to DCCP connection | ||
48 | state in response to incoming packets. It is used for debugging | ||
49 | DCCP congestion avoidance modules. If you don't understand | ||
50 | what was just said, you don't need it: say N. | ||
51 | |||
52 | Documentation on how to use the packet generator can be found | ||
53 | at http://linux-net.osdl.org/index.php/DccpProbe | ||
54 | |||
55 | To compile this code as a module, choose M here: the | ||
56 | module will be called dccp_probe. | ||
57 | |||
58 | |||
43 | endmenu | 59 | endmenu |
44 | 60 | ||
45 | endmenu | 61 | endmenu |
diff --git a/net/dccp/Makefile b/net/dccp/Makefile index 7696e219b05d..17ed99c46617 100644 --- a/net/dccp/Makefile +++ b/net/dccp/Makefile | |||
@@ -11,9 +11,11 @@ dccp_ipv4-y := ipv4.o | |||
11 | dccp-$(CONFIG_IP_DCCP_ACKVEC) += ackvec.o | 11 | dccp-$(CONFIG_IP_DCCP_ACKVEC) += ackvec.o |
12 | 12 | ||
13 | obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o | 13 | obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o |
14 | obj-$(CONFIG_NET_DCCPPROBE) += dccp_probe.o | ||
14 | 15 | ||
15 | dccp-$(CONFIG_SYSCTL) += sysctl.o | 16 | dccp-$(CONFIG_SYSCTL) += sysctl.o |
16 | 17 | ||
17 | dccp_diag-y := diag.o | 18 | dccp_diag-y := diag.o |
19 | dccp_probe-y := probe.o | ||
18 | 20 | ||
19 | obj-y += ccids/ | 21 | obj-y += ccids/ |
diff --git a/net/dccp/probe.c b/net/dccp/probe.c new file mode 100644 index 000000000000..146496fce2e2 --- /dev/null +++ b/net/dccp/probe.c | |||
@@ -0,0 +1,198 @@ | |||
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 | |||
34 | #include "dccp.h" | ||
35 | #include "ccid.h" | ||
36 | #include "ccids/ccid3.h" | ||
37 | |||
38 | static int port; | ||
39 | |||
40 | static int bufsize = 64 * 1024; | ||
41 | |||
42 | static const char procname[] = "dccpprobe"; | ||
43 | |||
44 | struct { | ||
45 | struct kfifo *fifo; | ||
46 | spinlock_t lock; | ||
47 | wait_queue_head_t wait; | ||
48 | struct timeval tstart; | ||
49 | } dccpw; | ||
50 | |||
51 | static void printl(const char *fmt, ...) | ||
52 | { | ||
53 | va_list args; | ||
54 | int len; | ||
55 | struct timeval now; | ||
56 | char tbuf[256]; | ||
57 | |||
58 | va_start(args, fmt); | ||
59 | do_gettimeofday(&now); | ||
60 | |||
61 | now.tv_sec -= dccpw.tstart.tv_sec; | ||
62 | now.tv_usec -= dccpw.tstart.tv_usec; | ||
63 | if (now.tv_usec < 0) { | ||
64 | --now.tv_sec; | ||
65 | now.tv_usec += 1000000; | ||
66 | } | ||
67 | |||
68 | len = sprintf(tbuf, "%lu.%06lu ", | ||
69 | (unsigned long) now.tv_sec, | ||
70 | (unsigned long) now.tv_usec); | ||
71 | len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args); | ||
72 | va_end(args); | ||
73 | |||
74 | kfifo_put(dccpw.fifo, tbuf, len); | ||
75 | wake_up(&dccpw.wait); | ||
76 | } | ||
77 | |||
78 | static int jdccp_sendmsg(struct kiocb *iocb, struct sock *sk, | ||
79 | struct msghdr *msg, size_t size) | ||
80 | { | ||
81 | const struct dccp_minisock *dmsk = dccp_msk(sk); | ||
82 | const struct inet_sock *inet = inet_sk(sk); | ||
83 | const struct ccid3_hc_tx_sock *hctx; | ||
84 | |||
85 | if (dmsk->dccpms_tx_ccid == DCCPC_CCID3) | ||
86 | hctx = ccid3_hc_tx_sk(sk); | ||
87 | else | ||
88 | hctx = NULL; | ||
89 | |||
90 | if (port == 0 || ntohs(inet->dport) == port || | ||
91 | ntohs(inet->sport) == port) { | ||
92 | if (hctx) | ||
93 | printl("%d.%d.%d.%d:%u %d.%d.%d.%d:%u %d %d %d %d %d\n", | ||
94 | NIPQUAD(inet->saddr), ntohs(inet->sport), | ||
95 | NIPQUAD(inet->daddr), ntohs(inet->dport), size, | ||
96 | hctx->ccid3hctx_s, hctx->ccid3hctx_rtt, | ||
97 | hctx->ccid3hctx_p, hctx->ccid3hctx_t_ipi); | ||
98 | else | ||
99 | printl("%d.%d.%d.%d:%u %d.%d.%d.%d:%u %d\n", | ||
100 | NIPQUAD(inet->saddr), ntohs(inet->sport), | ||
101 | NIPQUAD(inet->daddr), ntohs(inet->dport), size); | ||
102 | } | ||
103 | |||
104 | jprobe_return(); | ||
105 | return 0; | ||
106 | } | ||
107 | |||
108 | static struct jprobe dccp_send_probe = { | ||
109 | .kp = { .addr = (kprobe_opcode_t *)&dccp_sendmsg, }, | ||
110 | .entry = (kprobe_opcode_t *)&jdccp_sendmsg, | ||
111 | }; | ||
112 | |||
113 | static int dccpprobe_open(struct inode *inode, struct file *file) | ||
114 | { | ||
115 | kfifo_reset(dccpw.fifo); | ||
116 | do_gettimeofday(&dccpw.tstart); | ||
117 | return 0; | ||
118 | } | ||
119 | |||
120 | static ssize_t dccpprobe_read(struct file *file, char __user *buf, | ||
121 | size_t len, loff_t *ppos) | ||
122 | { | ||
123 | int error = 0, cnt = 0; | ||
124 | unsigned char *tbuf; | ||
125 | |||
126 | if (!buf || len < 0) | ||
127 | return -EINVAL; | ||
128 | |||
129 | if (len == 0) | ||
130 | return 0; | ||
131 | |||
132 | tbuf = vmalloc(len); | ||
133 | if (!tbuf) | ||
134 | return -ENOMEM; | ||
135 | |||
136 | error = wait_event_interruptible(dccpw.wait, | ||
137 | __kfifo_len(dccpw.fifo) != 0); | ||
138 | if (error) | ||
139 | goto out_free; | ||
140 | |||
141 | cnt = kfifo_get(dccpw.fifo, tbuf, len); | ||
142 | error = copy_to_user(buf, tbuf, cnt); | ||
143 | |||
144 | out_free: | ||
145 | vfree(tbuf); | ||
146 | |||
147 | return error ? error : cnt; | ||
148 | } | ||
149 | |||
150 | static struct file_operations dccpprobe_fops = { | ||
151 | .owner = THIS_MODULE, | ||
152 | .open = dccpprobe_open, | ||
153 | .read = dccpprobe_read, | ||
154 | }; | ||
155 | |||
156 | static __init int dccpprobe_init(void) | ||
157 | { | ||
158 | int ret = -ENOMEM; | ||
159 | |||
160 | init_waitqueue_head(&dccpw.wait); | ||
161 | spin_lock_init(&dccpw.lock); | ||
162 | dccpw.fifo = kfifo_alloc(bufsize, GFP_KERNEL, &dccpw.lock); | ||
163 | |||
164 | if (!proc_net_fops_create(procname, S_IRUSR, &dccpprobe_fops)) | ||
165 | goto err0; | ||
166 | |||
167 | ret = register_jprobe(&dccp_send_probe); | ||
168 | if (ret) | ||
169 | goto err1; | ||
170 | |||
171 | pr_info("DCCP watch registered (port=%d)\n", port); | ||
172 | return 0; | ||
173 | err1: | ||
174 | proc_net_remove(procname); | ||
175 | err0: | ||
176 | kfifo_free(dccpw.fifo); | ||
177 | return ret; | ||
178 | } | ||
179 | module_init(dccpprobe_init); | ||
180 | |||
181 | static __exit void dccpprobe_exit(void) | ||
182 | { | ||
183 | kfifo_free(dccpw.fifo); | ||
184 | proc_net_remove(procname); | ||
185 | unregister_jprobe(&dccp_send_probe); | ||
186 | |||
187 | } | ||
188 | module_exit(dccpprobe_exit); | ||
189 | |||
190 | MODULE_PARM_DESC(port, "Port to match (0=all)"); | ||
191 | module_param(port, int, 0); | ||
192 | |||
193 | MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)"); | ||
194 | module_param(bufsize, int, 0); | ||
195 | |||
196 | MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>"); | ||
197 | MODULE_DESCRIPTION("DCCP snooper"); | ||
198 | MODULE_LICENSE("GPL"); | ||