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Commit | Line | Data |
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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> | |
2a333e0f | 27 | |
28 | #include "pimd.h" | |
29 | ||
30 | #include "pim_msdp.h" | |
31 | #include "pim_msdp_socket.h" | |
32 | ||
2a333e0f | 33 | /* increase socket send buffer size */ |
34 | static void | |
35 | pim_msdp_update_sock_send_buffer_size (int fd) | |
36 | { | |
37 | int size = PIM_MSDP_SOCKET_SNDBUF_SIZE; | |
38 | int optval; | |
39 | socklen_t optlen = sizeof(optval); | |
40 | ||
41 | if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &optval, &optlen) < 0) { | |
42 | zlog_err("getsockopt of SO_SNDBUF failed %s\n", safe_strerror(errno)); | |
43 | return; | |
44 | } | |
45 | ||
46 | if (optval < size) { | |
47 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) < 0) { | |
48 | zlog_err("Couldn't increase send buffer: %s\n", safe_strerror(errno)); | |
49 | } | |
50 | } | |
51 | } | |
52 | ||
53 | /* passive peer socket accept */ | |
54 | static int | |
55 | pim_msdp_sock_accept(struct thread *thread) | |
56 | { | |
57 | union sockunion su; | |
58 | struct pim_msdp_listener *listener = THREAD_ARG(thread); | |
59 | int accept_sock; | |
60 | int msdp_sock; | |
61 | struct pim_msdp_peer *mp; | |
62 | char buf[SU_ADDRSTRLEN]; | |
63 | ||
64 | sockunion_init(&su); | |
65 | ||
66 | /* re-register accept thread */ | |
67 | accept_sock = THREAD_FD(thread); | |
68 | if (accept_sock < 0) { | |
69 | zlog_err ("accept_sock is negative value %d", accept_sock); | |
70 | return -1; | |
71 | } | |
66e78ae6 QY |
72 | listener->thread = NULL; |
73 | thread_add_read(master, pim_msdp_sock_accept, listener, accept_sock, | |
74 | &listener->thread); | |
2a333e0f | 75 | |
76 | /* accept client connection. */ | |
77 | msdp_sock = sockunion_accept(accept_sock, &su); | |
78 | if (msdp_sock < 0) { | |
79 | zlog_err ("pim_msdp_sock_accept failed (%s)", safe_strerror (errno)); | |
80 | return -1; | |
81 | } | |
82 | ||
83 | /* see if have peer config for this */ | |
84 | mp = pim_msdp_peer_find(su.sin.sin_addr); | |
85 | if (!mp || !PIM_MSDP_PEER_IS_LISTENER(mp)) { | |
86 | ++msdp->rejected_accepts; | |
15ad0c71 | 87 | if (PIM_DEBUG_MSDP_EVENTS) { |
88 | zlog_err("msdp peer connection refused from %s", | |
89 | sockunion2str(&su, buf, SU_ADDRSTRLEN)); | |
90 | } | |
2a333e0f | 91 | close(msdp_sock); |
92 | return -1; | |
93 | } | |
94 | ||
95 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
15ad0c71 | 96 | zlog_debug("MSDP peer %s accept success%s", mp->key_str, mp->fd>=0?"(dup)":""); |
2a333e0f | 97 | } |
98 | ||
99 | /* if we have an existing connection we need to kill that one | |
100 | * with this one */ | |
101 | if (mp->fd >= 0) { | |
15ad0c71 | 102 | if (PIM_DEBUG_MSDP_EVENTS) { |
103 | zlog_err("msdp peer new connection from %s stop old connection", | |
104 | sockunion2str(&su, buf, SU_ADDRSTRLEN)); | |
105 | } | |
106 | pim_msdp_peer_stop_tcp_conn(mp, true /* chg_state */); | |
2a333e0f | 107 | } |
108 | mp->fd = msdp_sock; | |
109 | set_nonblocking(mp->fd); | |
110 | pim_msdp_update_sock_send_buffer_size(mp->fd); | |
111 | pim_msdp_peer_established(mp); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | /* global listener for the MSDP well know TCP port */ | |
116 | int | |
117 | pim_msdp_sock_listen(void) | |
118 | { | |
119 | int sock; | |
120 | int socklen; | |
121 | struct sockaddr_in sin; | |
122 | int rc; | |
123 | struct pim_msdp_listener *listener = &msdp->listener; | |
124 | ||
125 | if (msdp->flags & PIM_MSDPF_LISTENER) { | |
126 | /* listener already setup */ | |
127 | return 0; | |
128 | } | |
129 | ||
130 | sock = socket(AF_INET, SOCK_STREAM, 0); | |
131 | if (sock < 0) { | |
132 | zlog_err ("socket: %s", safe_strerror (errno)); | |
133 | return sock; | |
134 | } | |
135 | ||
136 | memset(&sin, 0, sizeof(struct sockaddr_in)); | |
137 | sin.sin_family = AF_INET; | |
138 | sin.sin_port = htons(PIM_MSDP_TCP_PORT); | |
139 | socklen = sizeof(struct sockaddr_in); | |
140 | #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN | |
141 | sin.sin_len = socklen; | |
142 | #endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ | |
143 | ||
144 | sockopt_reuseaddr(sock); | |
145 | sockopt_reuseport(sock); | |
146 | ||
147 | if (pimd_privs.change(ZPRIVS_RAISE)) { | |
148 | zlog_err ("pim_msdp_socket: could not raise privs, %s", | |
149 | safe_strerror (errno)); | |
150 | } | |
151 | ||
3c72d654 | 152 | /* bind to well known TCP port */ |
2a333e0f | 153 | rc = bind(sock, (struct sockaddr *)&sin, socklen); |
154 | ||
155 | if (pimd_privs.change(ZPRIVS_LOWER)) { | |
3c72d654 | 156 | zlog_err ("pim_msdp_socket: could not lower privs, %s", |
2a333e0f | 157 | safe_strerror (errno)); |
158 | } | |
159 | ||
160 | if (rc < 0) { | |
161 | zlog_err ("pim_msdp_socket bind to port %d: %s", ntohs(sin.sin_port), safe_strerror (errno)); | |
162 | close(sock); | |
163 | return rc; | |
164 | } | |
165 | ||
166 | rc = listen(sock, 3 /* backlog */); | |
167 | if (rc < 0) { | |
168 | zlog_err ("pim_msdp_socket listen: %s", safe_strerror (errno)); | |
169 | close(sock); | |
170 | return rc; | |
171 | } | |
172 | ||
173 | /* add accept thread */ | |
174 | listener->fd = sock; | |
175 | memcpy(&listener->su, &sin, socklen); | |
66e78ae6 QY |
176 | listener->thread = NULL; |
177 | thread_add_read(msdp->master, pim_msdp_sock_accept, listener, sock, | |
178 | &listener->thread); | |
2a333e0f | 179 | |
180 | msdp->flags |= PIM_MSDPF_LISTENER; | |
181 | return 0; | |
182 | } | |
183 | ||
184 | /* active peer socket setup */ | |
185 | int | |
186 | pim_msdp_sock_connect(struct pim_msdp_peer *mp) | |
187 | { | |
188 | int rc; | |
189 | ||
190 | if (PIM_DEBUG_MSDP_INTERNAL) { | |
15ad0c71 | 191 | zlog_debug("MSDP peer %s attempt connect%s", mp->key_str, mp->fd<0?"":"(dup)"); |
2a333e0f | 192 | } |
193 | ||
194 | /* if we have an existing connection we need to kill that one | |
195 | * with this one */ | |
196 | if (mp->fd >= 0) { | |
15ad0c71 | 197 | if (PIM_DEBUG_MSDP_EVENTS) { |
198 | zlog_err("msdp duplicate connect to %s nuke old connection", mp->key_str); | |
199 | } | |
2a333e0f | 200 | pim_msdp_peer_stop_tcp_conn(mp, false /* chg_state */); |
201 | } | |
202 | ||
203 | /* Make socket for the peer. */ | |
204 | mp->fd = sockunion_socket(&mp->su_peer); | |
205 | if (mp->fd < 0) { | |
206 | zlog_err ("pim_msdp_socket socket failure: %s", safe_strerror (errno)); | |
207 | return -1; | |
208 | } | |
209 | ||
210 | set_nonblocking(mp->fd); | |
211 | ||
212 | /* Set socket send buffer size */ | |
213 | pim_msdp_update_sock_send_buffer_size(mp->fd); | |
214 | sockopt_reuseaddr(mp->fd); | |
215 | sockopt_reuseport(mp->fd); | |
216 | ||
217 | /* source bind */ | |
218 | rc = sockunion_bind(mp->fd, &mp->su_local, 0, &mp->su_local); | |
219 | if (rc < 0) { | |
220 | zlog_err ("pim_msdp_socket connect bind failure: %s", safe_strerror (errno)); | |
221 | close(mp->fd); | |
222 | mp->fd = -1; | |
223 | return rc; | |
224 | } | |
225 | ||
226 | /* Connect to the remote mp. */ | |
227 | return (sockunion_connect(mp->fd, &mp->su_peer, htons(PIM_MSDP_TCP_PORT), 0)); | |
228 | } | |
229 |