1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IP MSDP socket management
* Copyright (C) 2016 Cumulus Networks, Inc.
*/
#include <zebra.h>
#include <lib/log.h>
#include <lib/network.h>
#include <lib/sockunion.h>
#include "frrevent.h"
#include <lib/vty.h>
#include <lib/if.h>
#include <lib/vrf.h>
#include <lib/lib_errors.h>
#include "pimd.h"
#include "pim_instance.h"
#include "pim_sock.h"
#include "pim_errors.h"
#include "pim_msdp.h"
#include "pim_msdp_socket.h"
#include "sockopt.h"
/* increase socket send buffer size */
static void pim_msdp_update_sock_send_buffer_size(int fd)
{
int size = PIM_MSDP_SOCKET_SNDBUF_SIZE;
int optval;
socklen_t optlen = sizeof(optval);
if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) {
flog_err_sys(EC_LIB_SOCKET,
"getsockopt of SO_SNDBUF failed %s",
safe_strerror(errno));
return;
}
if (optval < size) {
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size))
< 0) {
flog_err_sys(EC_LIB_SOCKET,
"Couldn't increase send buffer: %s",
safe_strerror(errno));
}
}
}
/* passive peer socket accept */
static void pim_msdp_sock_accept(struct event *thread)
{
union sockunion su;
struct pim_instance *pim = EVENT_ARG(thread);
int accept_sock;
int msdp_sock;
struct pim_msdp_peer *mp;
sockunion_init(&su);
/* re-register accept thread */
accept_sock = EVENT_FD(thread);
if (accept_sock < 0) {
flog_err(EC_LIB_DEVELOPMENT, "accept_sock is negative value %d",
accept_sock);
return;
}
pim->msdp.listener.thread = NULL;
event_add_read(router->master, pim_msdp_sock_accept, pim, accept_sock,
&pim->msdp.listener.thread);
/* accept client connection. */
msdp_sock = sockunion_accept(accept_sock, &su);
if (msdp_sock < 0) {
flog_err_sys(EC_LIB_SOCKET, "pim_msdp_sock_accept failed (%s)",
safe_strerror(errno));
return;
}
/* see if have peer config for this */
mp = pim_msdp_peer_find(pim, su.sin.sin_addr);
if (!mp || !PIM_MSDP_PEER_IS_LISTENER(mp)) {
++pim->msdp.rejected_accepts;
if (PIM_DEBUG_MSDP_EVENTS) {
flog_err(EC_PIM_MSDP_PACKET,
"msdp peer connection refused from %pSU", &su);
}
close(msdp_sock);
return;
}
if (PIM_DEBUG_MSDP_INTERNAL) {
zlog_debug("MSDP peer %s accept success%s", mp->key_str,
mp->fd >= 0 ? "(dup)" : "");
}
/* if we have an existing connection we need to kill that one
* with this one */
if (mp->fd >= 0) {
if (PIM_DEBUG_MSDP_EVENTS) {
zlog_notice(
"msdp peer new connection from %pSU stop old connection",
&su);
}
pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */);
}
mp->fd = msdp_sock;
set_nonblocking(mp->fd);
pim_msdp_update_sock_send_buffer_size(mp->fd);
pim_msdp_peer_established(mp);
}
/* global listener for the MSDP well know TCP port */
int pim_msdp_sock_listen(struct pim_instance *pim)
{
int sock;
int socklen;
struct sockaddr_in sin;
int rc;
struct pim_msdp_listener *listener = &pim->msdp.listener;
if (pim->msdp.flags & PIM_MSDPF_LISTENER) {
/* listener already setup */
return 0;
}
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
flog_err_sys(EC_LIB_SOCKET, "socket: %s", safe_strerror(errno));
return sock;
}
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family = AF_INET;
sin.sin_port = htons(PIM_MSDP_TCP_PORT);
socklen = sizeof(struct sockaddr_in);
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
sin.sin_len = socklen;
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
sockopt_reuseaddr(sock);
sockopt_reuseport(sock);
if (pim->vrf->vrf_id != VRF_DEFAULT) {
struct interface *ifp =
if_lookup_by_name(pim->vrf->name, pim->vrf->vrf_id);
if (!ifp) {
flog_err(EC_LIB_INTERFACE,
"%s: Unable to lookup vrf interface: %s",
__func__, pim->vrf->name);
close(sock);
return -1;
}
if (pim_socket_bind(sock, ifp)) {
flog_err_sys(EC_LIB_SOCKET,
"%s: Unable to bind to socket: %s",
__func__, safe_strerror(errno));
close(sock);
return -1;
}
}
frr_with_privs(&pimd_privs) {
/* bind to well known TCP port */
rc = bind(sock, (struct sockaddr *)&sin, socklen);
}
if (rc < 0) {
flog_err_sys(EC_LIB_SOCKET,
"pim_msdp_socket bind to port %d: %s",
ntohs(sin.sin_port), safe_strerror(errno));
close(sock);
return rc;
}
rc = listen(sock, 3 /* backlog */);
if (rc < 0) {
flog_err_sys(EC_LIB_SOCKET, "pim_msdp_socket listen: %s",
safe_strerror(errno));
close(sock);
return rc;
}
/* Set socket DSCP byte */
if (setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL)) {
zlog_warn("can't set sockopt IP_TOS to MSDP socket %d: %s",
sock, safe_strerror(errno));
}
/* add accept thread */
listener->fd = sock;
memcpy(&listener->su, &sin, socklen);
event_add_read(pim->msdp.master, pim_msdp_sock_accept, pim, sock,
&listener->thread);
pim->msdp.flags |= PIM_MSDPF_LISTENER;
return 0;
}
/* active peer socket setup */
int pim_msdp_sock_connect(struct pim_msdp_peer *mp)
{
int rc;
if (PIM_DEBUG_MSDP_INTERNAL) {
zlog_debug("MSDP peer %s attempt connect%s", mp->key_str,
mp->fd < 0 ? "" : "(dup)");
}
/* if we have an existing connection we need to kill that one
* with this one */
if (mp->fd >= 0) {
if (PIM_DEBUG_MSDP_EVENTS) {
zlog_notice(
"msdp duplicate connect to %s nuke old connection",
mp->key_str);
}
pim_msdp_peer_stop_tcp_conn(mp, false /* chg_state */);
}
/* Make socket for the peer. */
mp->fd = sockunion_socket(&mp->su_peer);
if (mp->fd < 0) {
flog_err_sys(EC_LIB_SOCKET,
"pim_msdp_socket socket failure: %s",
safe_strerror(errno));
return -1;
}
if (mp->pim->vrf->vrf_id != VRF_DEFAULT) {
struct interface *ifp = if_lookup_by_name(mp->pim->vrf->name,
mp->pim->vrf->vrf_id);
if (!ifp) {
flog_err(EC_LIB_INTERFACE,
"%s: Unable to lookup vrf interface: %s",
__func__, mp->pim->vrf->name);
return -1;
}
if (pim_socket_bind(mp->fd, ifp)) {
flog_err_sys(EC_LIB_SOCKET,
"%s: Unable to bind to socket: %s",
__func__, safe_strerror(errno));
close(mp->fd);
mp->fd = -1;
return -1;
}
}
set_nonblocking(mp->fd);
/* Set socket send buffer size */
pim_msdp_update_sock_send_buffer_size(mp->fd);
sockopt_reuseaddr(mp->fd);
sockopt_reuseport(mp->fd);
/* source bind */
rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local);
if (rc < 0) {
flog_err_sys(EC_LIB_SOCKET,
"pim_msdp_socket connect bind failure: %s",
safe_strerror(errno));
close(mp->fd);
mp->fd = -1;
return rc;
}
/* Set socket DSCP byte */
if (setsockopt_ipv4_tos(mp->fd, IPTOS_PREC_INTERNETCONTROL)) {
zlog_warn("can't set sockopt IP_TOS to MSDP socket %d: %s",
mp->fd, safe_strerror(errno));
}
/* Connect to the remote mp. */
return (sockunion_connect(mp->fd, &mp->su_peer,
htons(PIM_MSDP_TCP_PORT), 0));
}
|
