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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 | * | |
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 | |
18 | */ | |
19 | ||
20 | #include <zebra.h> | |
21 | ||
22 | #include <lib/log.h> | |
23 | #include <lib/network.h> | |
24 | #include <lib/sockunion.h> | |
25 | #include <lib/thread.h> | |
26 | #include <lib/vty.h> | |
27 | #include <lib/if.h> | |
28 | #include <lib/vrf.h> | |
29 | #include <lib/lib_errors.h> | |
30 | ||
31 | #include "pimd.h" | |
32 | #include "pim_sock.h" | |
33 | #include "pim_errors.h" | |
34 | ||
35 | #include "pim_msdp.h" | |
36 | #include "pim_msdp_socket.h" | |
37 | ||
38 | /* increase socket send buffer size */ | |
39 | static void pim_msdp_update_sock_send_buffer_size(int fd) | |
40 | { | |
41 | int size = PIM_MSDP_SOCKET_SNDBUF_SIZE; | |
42 | int optval; | |
43 | socklen_t optlen = sizeof(optval); | |
44 | ||
45 | if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) { | |
46 | flog_err_sys(EC_LIB_SOCKET, | |
47 | "getsockopt of SO_SNDBUF failed %s\n", | |
48 | safe_strerror(errno)); | |
49 | return; | |
50 | } | |
51 | ||
52 | if (optval < size) { | |
53 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) | |
54 | < 0) { | |
55 | flog_err_sys(EC_LIB_SOCKET, | |
56 | "Couldn't increase send buffer: %s\n", | |
57 | safe_strerror(errno)); | |
58 | } | |
59 | } | |
60 | } | |
61 | ||
62 | /* passive peer socket accept */ | |
63 | static int pim_msdp_sock_accept(struct thread *thread) | |
64 | { | |
65 | union sockunion su; | |
66 | struct pim_instance *pim = THREAD_ARG(thread); | |
67 | int accept_sock; | |
68 | int msdp_sock; | |
69 | struct pim_msdp_peer *mp; | |
70 | char buf[SU_ADDRSTRLEN]; | |
71 | ||
72 | sockunion_init(&su); | |
73 | ||
74 | /* re-register accept thread */ | |
75 | accept_sock = THREAD_FD(thread); | |
76 | if (accept_sock < 0) { | |
77 | flog_err(EC_LIB_DEVELOPMENT, "accept_sock is negative value %d", | |
78 | accept_sock); | |
79 | return -1; | |
80 | } | |
81 | pim->msdp.listener.thread = NULL; | |
82 | thread_add_read(master, pim_msdp_sock_accept, pim, accept_sock, | |
83 | &pim->msdp.listener.thread); | |
84 | ||
85 | /* accept client connection. */ | |
86 | msdp_sock = sockunion_accept(accept_sock, &su); | |
87 | if (msdp_sock < 0) { | |
88 | flog_err_sys(EC_LIB_SOCKET, "pim_msdp_sock_accept failed (%s)", | |
89 | safe_strerror(errno)); | |
90 | return -1; | |
91 | } | |
92 | ||
93 | /* see if have peer config for this */ | |
94 | mp = pim_msdp_peer_find(pim, su.sin.sin_addr); | |
95 | if (!mp || !PIM_MSDP_PEER_IS_LISTENER(mp)) { | |
96 | ++pim->msdp.rejected_accepts; | |
97 | if (PIM_DEBUG_MSDP_EVENTS) { | |
98 | flog_err(EC_PIM_MSDP_PACKET, | |
99 | "msdp peer connection refused from %s", | |
100 | sockunion2str(&su, buf, SU_ADDRSTRLEN)); | |
101 | } | |
102 | close(msdp_sock); | |
103 | return -1; | |
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) { | |
115 | zlog_notice( | |
116 | "msdp peer new connection from %s stop old connection", | |
117 | sockunion2str(&su, buf, SU_ADDRSTRLEN)); | |
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); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* global listener for the MSDP well know TCP port */ | |
129 | int pim_msdp_sock_listen(struct pim_instance *pim) | |
130 | { | |
131 | int sock; | |
132 | int socklen; | |
133 | struct sockaddr_in sin; | |
134 | int rc; | |
135 | struct pim_msdp_listener *listener = &pim->msdp.listener; | |
136 | ||
137 | if (pim->msdp.flags & PIM_MSDPF_LISTENER) { | |
138 | /* listener already setup */ | |
139 | return 0; | |
140 | } | |
141 | ||
142 | sock = socket(AF_INET, SOCK_STREAM, 0); | |
143 | if (sock < 0) { | |
144 | flog_err_sys(EC_LIB_SOCKET, "socket: %s", safe_strerror(errno)); | |
145 | return sock; | |
146 | } | |
147 | ||
148 | memset(&sin, 0, sizeof(struct sockaddr_in)); | |
149 | sin.sin_family = AF_INET; | |
150 | sin.sin_port = htons(PIM_MSDP_TCP_PORT); | |
151 | socklen = sizeof(struct sockaddr_in); | |
152 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
153 | sin.sin_len = socklen; | |
154 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
155 | ||
156 | sockopt_reuseaddr(sock); | |
157 | sockopt_reuseport(sock); | |
158 | ||
159 | if (pim->vrf_id != VRF_DEFAULT) { | |
160 | struct interface *ifp = | |
161 | if_lookup_by_name(pim->vrf->name, pim->vrf_id); | |
162 | if (!ifp) { | |
163 | flog_err(EC_LIB_INTERFACE, | |
164 | "%s: Unable to lookup vrf interface: %s", | |
165 | __PRETTY_FUNCTION__, pim->vrf->name); | |
166 | close(sock); | |
167 | return -1; | |
168 | } | |
169 | if (pim_socket_bind(sock, ifp)) { | |
170 | flog_err_sys(EC_LIB_SOCKET, | |
171 | "%s: Unable to bind to socket: %s", | |
172 | __PRETTY_FUNCTION__, safe_strerror(errno)); | |
173 | close(sock); | |
174 | return -1; | |
175 | } | |
176 | } | |
177 | ||
178 | frr_elevate_privs(&pimd_privs) { | |
179 | /* bind to well known TCP port */ | |
180 | rc = bind(sock, (struct sockaddr *)&sin, socklen); | |
181 | } | |
182 | ||
183 | if (rc < 0) { | |
184 | flog_err_sys(EC_LIB_SOCKET, | |
185 | "pim_msdp_socket bind to port %d: %s", | |
186 | ntohs(sin.sin_port), safe_strerror(errno)); | |
187 | close(sock); | |
188 | return rc; | |
189 | } | |
190 | ||
191 | rc = listen(sock, 3 /* backlog */); | |
192 | if (rc < 0) { | |
193 | flog_err_sys(EC_LIB_SOCKET, "pim_msdp_socket listen: %s", | |
194 | safe_strerror(errno)); | |
195 | close(sock); | |
196 | return rc; | |
197 | } | |
198 | ||
199 | /* add accept thread */ | |
200 | listener->fd = sock; | |
201 | memcpy(&listener->su, &sin, socklen); | |
202 | listener->thread = NULL; | |
203 | thread_add_read(pim->msdp.master, pim_msdp_sock_accept, pim, sock, | |
204 | &listener->thread); | |
205 | ||
206 | pim->msdp.flags |= PIM_MSDPF_LISTENER; | |
207 | return 0; | |
208 | } | |
209 | ||
210 | /* active peer socket setup */ | |
211 | int pim_msdp_sock_connect(struct pim_msdp_peer *mp) | |
212 | { | |
213 | int rc; | |
214 | ||
215 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
216 | zlog_debug("MSDP peer %s attempt connect%s", mp->key_str, | |
217 | mp->fd < 0 ? "" : "(dup)"); | |
218 | } | |
219 | ||
220 | /* if we have an existing connection we need to kill that one | |
221 | * with this one */ | |
222 | if (mp->fd >= 0) { | |
223 | if (PIM_DEBUG_MSDP_EVENTS) { | |
224 | zlog_notice( | |
225 | "msdp duplicate connect to %s nuke old connection", | |
226 | mp->key_str); | |
227 | } | |
228 | pim_msdp_peer_stop_tcp_conn(mp, false /* chg_state */); | |
229 | } | |
230 | ||
231 | /* Make socket for the peer. */ | |
232 | mp->fd = sockunion_socket(&mp->su_peer); | |
233 | if (mp->fd < 0) { | |
234 | flog_err_sys(EC_LIB_SOCKET, | |
235 | "pim_msdp_socket socket failure: %s", | |
236 | safe_strerror(errno)); | |
237 | return -1; | |
238 | } | |
239 | ||
240 | if (mp->pim->vrf_id != VRF_DEFAULT) { | |
241 | struct interface *ifp = | |
242 | if_lookup_by_name(mp->pim->vrf->name, mp->pim->vrf_id); | |
243 | if (!ifp) { | |
244 | flog_err(EC_LIB_INTERFACE, | |
245 | "%s: Unable to lookup vrf interface: %s", | |
246 | __PRETTY_FUNCTION__, mp->pim->vrf->name); | |
247 | return -1; | |
248 | } | |
249 | if (pim_socket_bind(mp->fd, ifp)) { | |
250 | flog_err_sys(EC_LIB_SOCKET, | |
251 | "%s: Unable to bind to socket: %s", | |
252 | __PRETTY_FUNCTION__, safe_strerror(errno)); | |
253 | close(mp->fd); | |
254 | mp->fd = -1; | |
255 | return -1; | |
256 | } | |
257 | } | |
258 | ||
259 | set_nonblocking(mp->fd); | |
260 | ||
261 | /* Set socket send buffer size */ | |
262 | pim_msdp_update_sock_send_buffer_size(mp->fd); | |
263 | sockopt_reuseaddr(mp->fd); | |
264 | sockopt_reuseport(mp->fd); | |
265 | ||
266 | /* source bind */ | |
267 | rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local); | |
268 | if (rc < 0) { | |
269 | flog_err_sys(EC_LIB_SOCKET, | |
270 | "pim_msdp_socket connect bind failure: %s", | |
271 | safe_strerror(errno)); | |
272 | close(mp->fd); | |
273 | mp->fd = -1; | |
274 | return rc; | |
275 | } | |
276 | ||
277 | /* Connect to the remote mp. */ | |
278 | return (sockunion_connect(mp->fd, &mp->su_peer, | |
279 | htons(PIM_MSDP_TCP_PORT), 0)); | |
280 | } |