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2a333e0f | 1 | /* |
2 | * IP MSDP socket management | |
3 | * Copyright (C) 2016 Cumulus Networks, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
896014f4 DL |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; see the file COPYING; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2a333e0f | 18 | */ |
19 | ||
20 | #include <zebra.h> | |
21 | ||
22 | #include <lib/log.h> | |
23 | #include <lib/network.h> | |
2a333e0f | 24 | #include <lib/sockunion.h> |
3c72d654 | 25 | #include <lib/thread.h> |
26 | #include <lib/vty.h> | |
62fde409 DS |
27 | #include <lib/if.h> |
28 | #include <lib/vrf.h> | |
3613d898 | 29 | #include <lib/lib_errors.h> |
2a333e0f | 30 | |
31 | #include "pimd.h" | |
62fde409 | 32 | #include "pim_sock.h" |
d9ff4302 | 33 | #include "pim_errors.h" |
2a333e0f | 34 | |
35 | #include "pim_msdp.h" | |
36 | #include "pim_msdp_socket.h" | |
37 | ||
b069b568 AMR |
38 | #include "sockopt.h" |
39 | ||
2a333e0f | 40 | /* increase socket send buffer size */ |
d62a17ae | 41 | static void pim_msdp_update_sock_send_buffer_size(int fd) |
2a333e0f | 42 | { |
d62a17ae | 43 | int size = PIM_MSDP_SOCKET_SNDBUF_SIZE; |
44 | int optval; | |
45 | socklen_t optlen = sizeof(optval); | |
46 | ||
47 | if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) { | |
450971aa | 48 | flog_err_sys(EC_LIB_SOCKET, |
1d5453d6 | 49 | "getsockopt of SO_SNDBUF failed %s", |
09c866e3 | 50 | safe_strerror(errno)); |
d62a17ae | 51 | return; |
52 | } | |
53 | ||
54 | if (optval < size) { | |
55 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) | |
56 | < 0) { | |
450971aa | 57 | flog_err_sys(EC_LIB_SOCKET, |
1d5453d6 | 58 | "Couldn't increase send buffer: %s", |
09c866e3 | 59 | safe_strerror(errno)); |
d62a17ae | 60 | } |
61 | } | |
2a333e0f | 62 | } |
63 | ||
64 | /* passive peer socket accept */ | |
cc9f21da | 65 | static void pim_msdp_sock_accept(struct thread *thread) |
2a333e0f | 66 | { |
d62a17ae | 67 | union sockunion su; |
472ad383 | 68 | struct pim_instance *pim = THREAD_ARG(thread); |
d62a17ae | 69 | int accept_sock; |
70 | int msdp_sock; | |
71 | struct pim_msdp_peer *mp; | |
d62a17ae | 72 | |
73 | sockunion_init(&su); | |
74 | ||
75 | /* re-register accept thread */ | |
76 | accept_sock = THREAD_FD(thread); | |
77 | if (accept_sock < 0) { | |
1c50c1c0 QY |
78 | flog_err(EC_LIB_DEVELOPMENT, "accept_sock is negative value %d", |
79 | accept_sock); | |
cc9f21da | 80 | return; |
d62a17ae | 81 | } |
472ad383 | 82 | pim->msdp.listener.thread = NULL; |
36417fcc | 83 | thread_add_read(router->master, pim_msdp_sock_accept, pim, accept_sock, |
472ad383 | 84 | &pim->msdp.listener.thread); |
d62a17ae | 85 | |
86 | /* accept client connection. */ | |
87 | msdp_sock = sockunion_accept(accept_sock, &su); | |
88 | if (msdp_sock < 0) { | |
450971aa | 89 | flog_err_sys(EC_LIB_SOCKET, "pim_msdp_sock_accept failed (%s)", |
09c866e3 | 90 | safe_strerror(errno)); |
cc9f21da | 91 | return; |
d62a17ae | 92 | } |
93 | ||
94 | /* see if have peer config for this */ | |
472ad383 | 95 | mp = pim_msdp_peer_find(pim, su.sin.sin_addr); |
d62a17ae | 96 | if (!mp || !PIM_MSDP_PEER_IS_LISTENER(mp)) { |
472ad383 | 97 | ++pim->msdp.rejected_accepts; |
d62a17ae | 98 | if (PIM_DEBUG_MSDP_EVENTS) { |
298004a1 | 99 | flog_err(EC_PIM_MSDP_PACKET, |
6b73800b | 100 | "msdp peer connection refused from %pSU", &su); |
d62a17ae | 101 | } |
102 | close(msdp_sock); | |
cc9f21da | 103 | return; |
d62a17ae | 104 | } |
105 | ||
106 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
107 | zlog_debug("MSDP peer %s accept success%s", mp->key_str, | |
108 | mp->fd >= 0 ? "(dup)" : ""); | |
109 | } | |
110 | ||
111 | /* if we have an existing connection we need to kill that one | |
112 | * with this one */ | |
113 | if (mp->fd >= 0) { | |
114 | if (PIM_DEBUG_MSDP_EVENTS) { | |
3613d898 | 115 | zlog_notice( |
6b73800b DS |
116 | "msdp peer new connection from %pSU stop old connection", |
117 | &su); | |
d62a17ae | 118 | } |
119 | pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); | |
120 | } | |
121 | mp->fd = msdp_sock; | |
122 | set_nonblocking(mp->fd); | |
123 | pim_msdp_update_sock_send_buffer_size(mp->fd); | |
124 | pim_msdp_peer_established(mp); | |
2a333e0f | 125 | } |
126 | ||
127 | /* global listener for the MSDP well know TCP port */ | |
472ad383 | 128 | int pim_msdp_sock_listen(struct pim_instance *pim) |
2a333e0f | 129 | { |
d62a17ae | 130 | int sock; |
131 | int socklen; | |
132 | struct sockaddr_in sin; | |
133 | int rc; | |
472ad383 | 134 | struct pim_msdp_listener *listener = &pim->msdp.listener; |
d62a17ae | 135 | |
472ad383 | 136 | if (pim->msdp.flags & PIM_MSDPF_LISTENER) { |
d62a17ae | 137 | /* listener already setup */ |
138 | return 0; | |
139 | } | |
140 | ||
141 | sock = socket(AF_INET, SOCK_STREAM, 0); | |
142 | if (sock < 0) { | |
1c50c1c0 | 143 | flog_err_sys(EC_LIB_SOCKET, "socket: %s", safe_strerror(errno)); |
d62a17ae | 144 | return sock; |
145 | } | |
146 | ||
147 | memset(&sin, 0, sizeof(struct sockaddr_in)); | |
148 | sin.sin_family = AF_INET; | |
149 | sin.sin_port = htons(PIM_MSDP_TCP_PORT); | |
150 | socklen = sizeof(struct sockaddr_in); | |
2a333e0f | 151 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN |
d62a17ae | 152 | sin.sin_len = socklen; |
2a333e0f | 153 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ |
154 | ||
d62a17ae | 155 | sockopt_reuseaddr(sock); |
156 | sockopt_reuseport(sock); | |
157 | ||
d3cc1e45 | 158 | if (pim->vrf->vrf_id != VRF_DEFAULT) { |
2267994c | 159 | struct interface *ifp = |
d3cc1e45 | 160 | if_lookup_by_name(pim->vrf->name, pim->vrf->vrf_id); |
449a3f5b | 161 | if (!ifp) { |
450971aa | 162 | flog_err(EC_LIB_INTERFACE, |
1c50c1c0 | 163 | "%s: Unable to lookup vrf interface: %s", |
5e81f5dd | 164 | __func__, pim->vrf->name); |
e691f179 DS |
165 | close(sock); |
166 | return -1; | |
167 | } | |
168 | if (pim_socket_bind(sock, ifp)) { | |
450971aa | 169 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 | 170 | "%s: Unable to bind to socket: %s", |
5e81f5dd | 171 | __func__, safe_strerror(errno)); |
e691f179 | 172 | close(sock); |
449a3f5b DS |
173 | return -1; |
174 | } | |
2267994c DS |
175 | } |
176 | ||
0cf6db21 | 177 | frr_with_privs(&pimd_privs) { |
6bb30c2c DL |
178 | /* bind to well known TCP port */ |
179 | rc = bind(sock, (struct sockaddr *)&sin, socklen); | |
d62a17ae | 180 | } |
181 | ||
182 | if (rc < 0) { | |
450971aa | 183 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
184 | "pim_msdp_socket bind to port %d: %s", |
185 | ntohs(sin.sin_port), safe_strerror(errno)); | |
d62a17ae | 186 | close(sock); |
187 | return rc; | |
188 | } | |
189 | ||
190 | rc = listen(sock, 3 /* backlog */); | |
191 | if (rc < 0) { | |
450971aa | 192 | flog_err_sys(EC_LIB_SOCKET, "pim_msdp_socket listen: %s", |
09c866e3 | 193 | safe_strerror(errno)); |
d62a17ae | 194 | close(sock); |
195 | return rc; | |
196 | } | |
197 | ||
b069b568 AMR |
198 | /* Set socket DSCP byte */ |
199 | if (setsockopt_ipv4_tos(sock, IPTOS_PREC_INTERNETCONTROL)) { | |
200 | zlog_warn("can't set sockopt IP_TOS to MSDP socket %d: %s", | |
201 | sock, safe_strerror(errno)); | |
202 | } | |
203 | ||
d62a17ae | 204 | /* add accept thread */ |
205 | listener->fd = sock; | |
206 | memcpy(&listener->su, &sin, socklen); | |
472ad383 | 207 | thread_add_read(pim->msdp.master, pim_msdp_sock_accept, pim, sock, |
d62a17ae | 208 | &listener->thread); |
209 | ||
472ad383 | 210 | pim->msdp.flags |= PIM_MSDPF_LISTENER; |
d62a17ae | 211 | return 0; |
2a333e0f | 212 | } |
213 | ||
214 | /* active peer socket setup */ | |
d62a17ae | 215 | int pim_msdp_sock_connect(struct pim_msdp_peer *mp) |
2a333e0f | 216 | { |
d62a17ae | 217 | int rc; |
218 | ||
219 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
220 | zlog_debug("MSDP peer %s attempt connect%s", mp->key_str, | |
221 | mp->fd < 0 ? "" : "(dup)"); | |
222 | } | |
223 | ||
224 | /* if we have an existing connection we need to kill that one | |
225 | * with this one */ | |
226 | if (mp->fd >= 0) { | |
227 | if (PIM_DEBUG_MSDP_EVENTS) { | |
3613d898 | 228 | zlog_notice( |
d62a17ae | 229 | "msdp duplicate connect to %s nuke old connection", |
230 | mp->key_str); | |
231 | } | |
232 | pim_msdp_peer_stop_tcp_conn(mp, false /* chg_state */); | |
233 | } | |
234 | ||
235 | /* Make socket for the peer. */ | |
236 | mp->fd = sockunion_socket(&mp->su_peer); | |
237 | if (mp->fd < 0) { | |
450971aa | 238 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
239 | "pim_msdp_socket socket failure: %s", |
240 | safe_strerror(errno)); | |
d62a17ae | 241 | return -1; |
242 | } | |
243 | ||
d3cc1e45 DS |
244 | if (mp->pim->vrf->vrf_id != VRF_DEFAULT) { |
245 | struct interface *ifp = if_lookup_by_name(mp->pim->vrf->name, | |
246 | mp->pim->vrf->vrf_id); | |
449a3f5b | 247 | if (!ifp) { |
450971aa | 248 | flog_err(EC_LIB_INTERFACE, |
1c50c1c0 | 249 | "%s: Unable to lookup vrf interface: %s", |
15569c58 | 250 | __func__, mp->pim->vrf->name); |
449a3f5b DS |
251 | return -1; |
252 | } | |
e691f179 | 253 | if (pim_socket_bind(mp->fd, ifp)) { |
450971aa | 254 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 | 255 | "%s: Unable to bind to socket: %s", |
15569c58 | 256 | __func__, safe_strerror(errno)); |
e691f179 DS |
257 | close(mp->fd); |
258 | mp->fd = -1; | |
259 | return -1; | |
260 | } | |
62fde409 DS |
261 | } |
262 | ||
d62a17ae | 263 | set_nonblocking(mp->fd); |
264 | ||
265 | /* Set socket send buffer size */ | |
266 | pim_msdp_update_sock_send_buffer_size(mp->fd); | |
267 | sockopt_reuseaddr(mp->fd); | |
268 | sockopt_reuseport(mp->fd); | |
269 | ||
270 | /* source bind */ | |
271 | rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local); | |
272 | if (rc < 0) { | |
450971aa | 273 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
274 | "pim_msdp_socket connect bind failure: %s", |
275 | safe_strerror(errno)); | |
d62a17ae | 276 | close(mp->fd); |
277 | mp->fd = -1; | |
278 | return rc; | |
279 | } | |
280 | ||
b069b568 AMR |
281 | /* Set socket DSCP byte */ |
282 | if (setsockopt_ipv4_tos(mp->fd, IPTOS_PREC_INTERNETCONTROL)) { | |
283 | zlog_warn("can't set sockopt IP_TOS to MSDP socket %d: %s", | |
284 | mp->fd, safe_strerror(errno)); | |
285 | } | |
286 | ||
d62a17ae | 287 | /* Connect to the remote mp. */ |
288 | return (sockunion_connect(mp->fd, &mp->su_peer, | |
289 | htons(PIM_MSDP_TCP_PORT), 0)); | |
2a333e0f | 290 | } |