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Commit | Line | Data |
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718e3744 | 1 | /* Kernel communication using netlink interface. |
2 | * Copyright (C) 1999 Kunihiro Ishiguro | |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
896014f4 DL |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 19 | */ |
1fdc9eae | 20 | |
21 | #include <zebra.h> | |
22 | ||
acfa8927 | 23 | #if defined(HANDLE_NETLINK_FUZZING) |
81a2f870 SW |
24 | #include <stdio.h> |
25 | #include <string.h> | |
96b43ab3 | 26 | #include "libfrr.h" |
acfa8927 | 27 | #endif /* HANDLE_NETLINK_FUZZING */ |
81a2f870 | 28 | |
ddfeb486 DL |
29 | #ifdef HAVE_NETLINK |
30 | ||
1fdc9eae | 31 | #include "linklist.h" |
32 | #include "if.h" | |
33 | #include "log.h" | |
34 | #include "prefix.h" | |
35 | #include "connected.h" | |
36 | #include "table.h" | |
37 | #include "memory.h" | |
38 | #include "zebra_memory.h" | |
39 | #include "rib.h" | |
40 | #include "thread.h" | |
41 | #include "privs.h" | |
42 | #include "nexthop.h" | |
43 | #include "vrf.h" | |
44 | #include "mpls.h" | |
174482ef | 45 | #include "lib_errors.h" |
1fdc9eae | 46 | |
3801e764 DS |
47 | //#include "zebra/zserv.h" |
48 | #include "zebra/zebra_router.h" | |
1fdc9eae | 49 | #include "zebra/zebra_ns.h" |
50 | #include "zebra/zebra_vrf.h" | |
05f7f5db | 51 | #include "zebra/rt.h" |
1fdc9eae | 52 | #include "zebra/debug.h" |
53 | #include "zebra/kernel_netlink.h" | |
54 | #include "zebra/rt_netlink.h" | |
55 | #include "zebra/if_netlink.h" | |
942bf97b | 56 | #include "zebra/rule_netlink.h" |
43e52561 | 57 | #include "zebra/zebra_errors.h" |
1fdc9eae | 58 | |
59 | #ifndef SO_RCVBUFFORCE | |
60 | #define SO_RCVBUFFORCE (33) | |
61 | #endif | |
62 | ||
63 | /* Hack for GNU libc version 2. */ | |
64 | #ifndef MSG_TRUNC | |
65 | #define MSG_TRUNC 0x20 | |
66 | #endif /* MSG_TRUNC */ | |
67 | ||
68 | #ifndef NLMSG_TAIL | |
d62a17ae | 69 | #define NLMSG_TAIL(nmsg) \ |
d7c0a89a QY |
70 | ((struct rtattr *)(((uint8_t *)(nmsg)) \ |
71 | + NLMSG_ALIGN((nmsg)->nlmsg_len))) | |
1fdc9eae | 72 | #endif |
73 | ||
74 | #ifndef RTA_TAIL | |
d62a17ae | 75 | #define RTA_TAIL(rta) \ |
d7c0a89a | 76 | ((struct rtattr *)(((uint8_t *)(rta)) + RTA_ALIGN((rta)->rta_len))) |
1fdc9eae | 77 | #endif |
78 | ||
f909c673 DS |
79 | #ifndef RTNL_FAMILY_IP6MR |
80 | #define RTNL_FAMILY_IP6MR 129 | |
81 | #endif | |
82 | ||
83 | #ifndef RTPROT_MROUTED | |
84 | #define RTPROT_MROUTED 17 | |
85 | #endif | |
86 | ||
d62a17ae | 87 | static const struct message nlmsg_str[] = {{RTM_NEWROUTE, "RTM_NEWROUTE"}, |
88 | {RTM_DELROUTE, "RTM_DELROUTE"}, | |
89 | {RTM_GETROUTE, "RTM_GETROUTE"}, | |
90 | {RTM_NEWLINK, "RTM_NEWLINK"}, | |
91 | {RTM_DELLINK, "RTM_DELLINK"}, | |
92 | {RTM_GETLINK, "RTM_GETLINK"}, | |
93 | {RTM_NEWADDR, "RTM_NEWADDR"}, | |
94 | {RTM_DELADDR, "RTM_DELADDR"}, | |
95 | {RTM_GETADDR, "RTM_GETADDR"}, | |
96 | {RTM_NEWNEIGH, "RTM_NEWNEIGH"}, | |
97 | {RTM_DELNEIGH, "RTM_DELNEIGH"}, | |
98 | {RTM_GETNEIGH, "RTM_GETNEIGH"}, | |
942bf97b | 99 | {RTM_NEWRULE, "RTM_NEWRULE"}, |
100 | {RTM_DELRULE, "RTM_DELRULE"}, | |
101 | {RTM_GETRULE, "RTM_GETRULE"}, | |
d62a17ae | 102 | {0}}; |
1fdc9eae | 103 | |
104 | static const struct message rtproto_str[] = { | |
d62a17ae | 105 | {RTPROT_REDIRECT, "redirect"}, |
106 | {RTPROT_KERNEL, "kernel"}, | |
107 | {RTPROT_BOOT, "boot"}, | |
108 | {RTPROT_STATIC, "static"}, | |
109 | {RTPROT_GATED, "GateD"}, | |
110 | {RTPROT_RA, "router advertisement"}, | |
111 | {RTPROT_MRT, "MRT"}, | |
112 | {RTPROT_ZEBRA, "Zebra"}, | |
1fdc9eae | 113 | #ifdef RTPROT_BIRD |
d62a17ae | 114 | {RTPROT_BIRD, "BIRD"}, |
1fdc9eae | 115 | #endif /* RTPROT_BIRD */ |
d62a17ae | 116 | {RTPROT_MROUTED, "mroute"}, |
117 | {RTPROT_BGP, "BGP"}, | |
118 | {RTPROT_OSPF, "OSPF"}, | |
119 | {RTPROT_ISIS, "IS-IS"}, | |
120 | {RTPROT_RIP, "RIP"}, | |
121 | {RTPROT_RIPNG, "RIPNG"}, | |
d4d71f11 | 122 | {RTPROT_ZSTATIC, "static"}, |
d62a17ae | 123 | {0}}; |
124 | ||
125 | static const struct message family_str[] = {{AF_INET, "ipv4"}, | |
126 | {AF_INET6, "ipv6"}, | |
127 | {AF_BRIDGE, "bridge"}, | |
128 | {RTNL_FAMILY_IPMR, "ipv4MR"}, | |
129 | {RTNL_FAMILY_IP6MR, "ipv6MR"}, | |
130 | {0}}; | |
131 | ||
8c8f250b DS |
132 | static const struct message rttype_str[] = {{RTN_UNSPEC, "none"}, |
133 | {RTN_UNICAST, "unicast"}, | |
134 | {RTN_LOCAL, "local"}, | |
135 | {RTN_BROADCAST, "broadcast"}, | |
136 | {RTN_ANYCAST, "anycast"}, | |
d62a17ae | 137 | {RTN_MULTICAST, "multicast"}, |
8c8f250b DS |
138 | {RTN_BLACKHOLE, "blackhole"}, |
139 | {RTN_UNREACHABLE, "unreachable"}, | |
140 | {RTN_PROHIBIT, "prohibited"}, | |
141 | {RTN_THROW, "throw"}, | |
142 | {RTN_NAT, "nat"}, | |
143 | {RTN_XRESOLVE, "resolver"}, | |
d62a17ae | 144 | {0}}; |
b339bde7 | 145 | |
1fdc9eae | 146 | extern struct thread_master *master; |
d7c0a89a | 147 | extern uint32_t nl_rcvbufsize; |
1fdc9eae | 148 | |
149 | extern struct zebra_privs_t zserv_privs; | |
150 | ||
7cdb1a84 | 151 | |
2414abd3 | 152 | int netlink_talk_filter(struct nlmsghdr *h, ns_id_t ns_id, int startup) |
1fdc9eae | 153 | { |
3575d9e8 DS |
154 | /* |
155 | * This is an error condition that must be handled during | |
156 | * development. | |
157 | * | |
158 | * The netlink_talk_filter function is used for communication | |
159 | * down the netlink_cmd pipe and we are expecting | |
160 | * an ack being received. So if we get here | |
161 | * then we did not receive the ack and instead | |
162 | * received some other message in an unexpected | |
163 | * way. | |
164 | */ | |
43e52561 QY |
165 | zlog_debug("%s: ignoring message type 0x%04x(%s) NS %u", __func__, |
166 | h->nlmsg_type, nl_msg_type_to_str(h->nlmsg_type), ns_id); | |
d62a17ae | 167 | return 0; |
1fdc9eae | 168 | } |
169 | ||
d62a17ae | 170 | static int netlink_recvbuf(struct nlsock *nl, uint32_t newsize) |
1fdc9eae | 171 | { |
d7c0a89a | 172 | uint32_t oldsize; |
d62a17ae | 173 | socklen_t newlen = sizeof(newsize); |
174 | socklen_t oldlen = sizeof(oldsize); | |
175 | int ret; | |
176 | ||
177 | ret = getsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &oldsize, &oldlen); | |
178 | if (ret < 0) { | |
450971aa | 179 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
180 | "Can't get %s receive buffer size: %s", nl->name, |
181 | safe_strerror(errno)); | |
d62a17ae | 182 | return -1; |
183 | } | |
184 | ||
185 | /* Try force option (linux >= 2.6.14) and fall back to normal set */ | |
0cf6db21 | 186 | frr_with_privs(&zserv_privs) { |
01b9e3fd DL |
187 | ret = setsockopt(nl->sock, SOL_SOCKET, SO_RCVBUFFORCE, |
188 | &nl_rcvbufsize, | |
189 | sizeof(nl_rcvbufsize)); | |
190 | } | |
d62a17ae | 191 | if (ret < 0) |
192 | ret = setsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, | |
193 | &nl_rcvbufsize, sizeof(nl_rcvbufsize)); | |
194 | if (ret < 0) { | |
450971aa | 195 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
196 | "Can't set %s receive buffer size: %s", nl->name, |
197 | safe_strerror(errno)); | |
d62a17ae | 198 | return -1; |
199 | } | |
200 | ||
201 | ret = getsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &newsize, &newlen); | |
202 | if (ret < 0) { | |
450971aa | 203 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
204 | "Can't get %s receive buffer size: %s", nl->name, |
205 | safe_strerror(errno)); | |
d62a17ae | 206 | return -1; |
207 | } | |
208 | ||
209 | zlog_info("Setting netlink socket receive buffer size: %u -> %u", | |
210 | oldsize, newsize); | |
211 | return 0; | |
1fdc9eae | 212 | } |
213 | ||
214 | /* Make socket for Linux netlink interface. */ | |
d62a17ae | 215 | static int netlink_socket(struct nlsock *nl, unsigned long groups, |
216 | ns_id_t ns_id) | |
1fdc9eae | 217 | { |
d62a17ae | 218 | int ret; |
219 | struct sockaddr_nl snl; | |
220 | int sock; | |
221 | int namelen; | |
d62a17ae | 222 | |
0cf6db21 | 223 | frr_with_privs(&zserv_privs) { |
6bb30c2c DL |
224 | sock = ns_socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE, ns_id); |
225 | if (sock < 0) { | |
226 | zlog_err("Can't open %s socket: %s", nl->name, | |
227 | safe_strerror(errno)); | |
228 | return -1; | |
229 | } | |
d62a17ae | 230 | |
6bb30c2c DL |
231 | memset(&snl, 0, sizeof snl); |
232 | snl.nl_family = AF_NETLINK; | |
233 | snl.nl_groups = groups; | |
d62a17ae | 234 | |
6bb30c2c DL |
235 | /* Bind the socket to the netlink structure for anything. */ |
236 | ret = bind(sock, (struct sockaddr *)&snl, sizeof snl); | |
237 | } | |
d62a17ae | 238 | |
239 | if (ret < 0) { | |
6bb30c2c DL |
240 | zlog_err("Can't bind %s socket to group 0x%x: %s", nl->name, |
241 | snl.nl_groups, safe_strerror(errno)); | |
d62a17ae | 242 | close(sock); |
243 | return -1; | |
244 | } | |
245 | ||
246 | /* multiple netlink sockets will have different nl_pid */ | |
247 | namelen = sizeof snl; | |
248 | ret = getsockname(sock, (struct sockaddr *)&snl, (socklen_t *)&namelen); | |
249 | if (ret < 0 || namelen != sizeof snl) { | |
450971aa | 250 | flog_err_sys(EC_LIB_SOCKET, "Can't get %s socket name: %s", |
09c866e3 | 251 | nl->name, safe_strerror(errno)); |
d62a17ae | 252 | close(sock); |
253 | return -1; | |
254 | } | |
255 | ||
256 | nl->snl = snl; | |
257 | nl->sock = sock; | |
258 | return ret; | |
1fdc9eae | 259 | } |
260 | ||
2414abd3 | 261 | static int netlink_information_fetch(struct nlmsghdr *h, ns_id_t ns_id, |
d62a17ae | 262 | int startup) |
1fdc9eae | 263 | { |
3575d9e8 DS |
264 | /* |
265 | * When we handle new message types here | |
266 | * because we are starting to install them | |
267 | * then lets check the netlink_install_filter | |
268 | * and see if we should add the corresponding | |
269 | * allow through entry there. | |
270 | * Probably not needed to do but please | |
271 | * think about it. | |
272 | */ | |
d62a17ae | 273 | switch (h->nlmsg_type) { |
274 | case RTM_NEWROUTE: | |
2414abd3 | 275 | return netlink_route_change(h, ns_id, startup); |
d62a17ae | 276 | case RTM_DELROUTE: |
2414abd3 | 277 | return netlink_route_change(h, ns_id, startup); |
d62a17ae | 278 | case RTM_NEWLINK: |
2414abd3 | 279 | return netlink_link_change(h, ns_id, startup); |
d62a17ae | 280 | case RTM_DELLINK: |
2414abd3 | 281 | return netlink_link_change(h, ns_id, startup); |
d62a17ae | 282 | case RTM_NEWADDR: |
2414abd3 | 283 | return netlink_interface_addr(h, ns_id, startup); |
d62a17ae | 284 | case RTM_DELADDR: |
2414abd3 | 285 | return netlink_interface_addr(h, ns_id, startup); |
d62a17ae | 286 | case RTM_NEWNEIGH: |
2414abd3 | 287 | return netlink_neigh_change(h, ns_id); |
d62a17ae | 288 | case RTM_DELNEIGH: |
2414abd3 | 289 | return netlink_neigh_change(h, ns_id); |
942bf97b | 290 | case RTM_NEWRULE: |
2414abd3 | 291 | return netlink_rule_change(h, ns_id, startup); |
942bf97b | 292 | case RTM_DELRULE: |
2414abd3 | 293 | return netlink_rule_change(h, ns_id, startup); |
d62a17ae | 294 | default: |
3575d9e8 DS |
295 | /* |
296 | * If we have received this message then | |
297 | * we have made a mistake during development | |
298 | * and we need to write some code to handle | |
299 | * this message type or not ask for | |
300 | * it to be sent up to us | |
301 | */ | |
e914ccbe | 302 | flog_err(EC_ZEBRA_UNKNOWN_NLMSG, |
1c50c1c0 QY |
303 | "Unknown netlink nlmsg_type %s(%d) vrf %u\n", |
304 | nl_msg_type_to_str(h->nlmsg_type), h->nlmsg_type, | |
305 | ns_id); | |
d62a17ae | 306 | break; |
307 | } | |
308 | return 0; | |
1fdc9eae | 309 | } |
310 | ||
acfa8927 | 311 | #if defined(HANDLE_NETLINK_FUZZING) |
81a2f870 SW |
312 | /* Using globals here to avoid adding function parameters */ |
313 | ||
314 | /* Keep distinct filenames for netlink fuzzy collection */ | |
315 | static unsigned int netlink_file_counter = 1; | |
316 | ||
317 | /* File name to read fuzzed netlink from */ | |
318 | static char netlink_fuzz_file[MAXPATHLEN] = ""; | |
319 | ||
320 | /* Flag for whether to read from file or not */ | |
29bf7b0b | 321 | bool netlink_read; |
81a2f870 SW |
322 | |
323 | /** | |
324 | * netlink_read_init() - Starts the message parser | |
325 | * @fname: Filename to read. | |
326 | */ | |
327 | void netlink_read_init(const char *fname) | |
328 | { | |
1bcea841 MS |
329 | struct zebra_dplane_info dp_info; |
330 | ||
81a2f870 SW |
331 | snprintf(netlink_fuzz_file, MAXPATHLEN, "%s", fname); |
332 | /* Creating this fake socket for testing purposes */ | |
ef593eff SW |
333 | struct zebra_ns *zns = zebra_ns_lookup(NS_DEFAULT); |
334 | ||
1bcea841 MS |
335 | /* Capture key info from zns struct */ |
336 | zebra_dplane_info_from_zns(&dp_info, zns, false); | |
337 | ||
338 | netlink_parse_info(netlink_information_fetch, &zns->netlink, | |
339 | &dp_info, 1, 0); | |
81a2f870 SW |
340 | } |
341 | ||
342 | /** | |
343 | * netlink_write_incoming() - Writes all data received from netlink to a file | |
344 | * @buf: Data from netlink. | |
345 | * @size: Size of data. | |
346 | * @counter: Counter for keeping filenames distinct. | |
347 | */ | |
348 | static void netlink_write_incoming(const char *buf, const unsigned int size, | |
349 | unsigned int counter) | |
350 | { | |
351 | char fname[MAXPATHLEN]; | |
352 | FILE *f; | |
353 | ||
3c649c71 | 354 | snprintf(fname, MAXPATHLEN, "%s/%s_%u", frr_vtydir, "netlink", counter); |
0cf6db21 | 355 | frr_with_privs(&zserv_privs) { |
6bb30c2c DL |
356 | f = fopen(fname, "w"); |
357 | } | |
81a2f870 SW |
358 | if (f) { |
359 | fwrite(buf, 1, size, f); | |
360 | fclose(f); | |
361 | } | |
81a2f870 SW |
362 | } |
363 | ||
364 | /** | |
365 | * netlink_read_file() - Reads netlink data from file | |
366 | * @buf: Netlink buffer being overwritten. | |
367 | * @fname: File name to read from. | |
368 | * | |
369 | * Return: Size of file. | |
370 | */ | |
371 | static long netlink_read_file(char *buf, const char *fname) | |
372 | { | |
373 | FILE *f; | |
374 | long file_bytes = -1; | |
bd7891fd | 375 | |
0cf6db21 | 376 | frr_with_privs(&zserv_privs) { |
6bb30c2c DL |
377 | f = fopen(fname, "r"); |
378 | } | |
81a2f870 SW |
379 | if (f) { |
380 | fseek(f, 0, SEEK_END); | |
381 | file_bytes = ftell(f); | |
382 | rewind(f); | |
ef593eff | 383 | fread(buf, NL_RCV_PKT_BUF_SIZE, 1, f); |
81a2f870 SW |
384 | fclose(f); |
385 | } | |
81a2f870 SW |
386 | return file_bytes; |
387 | } | |
388 | ||
acfa8927 | 389 | #endif /* HANDLE_NETLINK_FUZZING */ |
81a2f870 | 390 | |
d62a17ae | 391 | static int kernel_read(struct thread *thread) |
1fdc9eae | 392 | { |
d62a17ae | 393 | struct zebra_ns *zns = (struct zebra_ns *)THREAD_ARG(thread); |
85a75f1e MS |
394 | struct zebra_dplane_info dp_info; |
395 | ||
396 | /* Capture key info from ns struct */ | |
397 | zebra_dplane_info_from_zns(&dp_info, zns, false); | |
398 | ||
399 | netlink_parse_info(netlink_information_fetch, &zns->netlink, &dp_info, | |
400 | 5, 0); | |
d62a17ae | 401 | zns->t_netlink = NULL; |
3801e764 | 402 | thread_add_read(zrouter.master, kernel_read, zns, zns->netlink.sock, |
d62a17ae | 403 | &zns->t_netlink); |
1fdc9eae | 404 | |
d62a17ae | 405 | return 0; |
1fdc9eae | 406 | } |
407 | ||
3575d9e8 DS |
408 | /* |
409 | * Filter out messages from self that occur on listener socket, | |
62b8bb7a | 410 | * caused by our actions on the command socket(s) |
3575d9e8 DS |
411 | * |
412 | * When we add new Netlink message types we probably | |
413 | * do not need to add them here as that we are filtering | |
414 | * on the routes we actually care to receive( which is rarer | |
415 | * then the normal course of operations). We are intentionally | |
416 | * allowing some messages from ourselves through | |
417 | * ( I'm looking at you Interface based netlink messages ) | |
418 | * so that we only had to write one way to handle incoming | |
419 | * address add/delete changes. | |
1fdc9eae | 420 | */ |
62b8bb7a | 421 | static void netlink_install_filter(int sock, __u32 pid, __u32 dplane_pid) |
1fdc9eae | 422 | { |
3575d9e8 DS |
423 | /* |
424 | * BPF_JUMP instructions and where you jump to are based upon | |
425 | * 0 as being the next statement. So count from 0. Writing | |
426 | * this down because every time I look at this I have to | |
427 | * re-remember it. | |
428 | */ | |
d62a17ae | 429 | struct sock_filter filter[] = { |
3575d9e8 DS |
430 | /* |
431 | * Logic: | |
62b8bb7a MS |
432 | * if (nlmsg_pid == pid || |
433 | * nlmsg_pid == dplane_pid) { | |
3575d9e8 DS |
434 | * if (the incoming nlmsg_type == |
435 | * RTM_NEWADDR | RTM_DELADDR) | |
436 | * keep this message | |
437 | * else | |
438 | * skip this message | |
439 | * } else | |
440 | * keep this netlink message | |
441 | */ | |
442 | /* | |
443 | * 0: Load the nlmsg_pid into the BPF register | |
444 | */ | |
d62a17ae | 445 | BPF_STMT(BPF_LD | BPF_ABS | BPF_W, |
446 | offsetof(struct nlmsghdr, nlmsg_pid)), | |
3575d9e8 DS |
447 | /* |
448 | * 1: Compare to pid | |
449 | */ | |
62b8bb7a | 450 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htonl(pid), 1, 0), |
3575d9e8 | 451 | /* |
62b8bb7a MS |
452 | * 2: Compare to dplane pid |
453 | */ | |
454 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htonl(dplane_pid), 0, 4), | |
455 | /* | |
456 | * 3: Load the nlmsg_type into BPF register | |
3575d9e8 DS |
457 | */ |
458 | BPF_STMT(BPF_LD | BPF_ABS | BPF_H, | |
459 | offsetof(struct nlmsghdr, nlmsg_type)), | |
460 | /* | |
62b8bb7a | 461 | * 4: Compare to RTM_NEWADDR |
3575d9e8 DS |
462 | */ |
463 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htons(RTM_NEWADDR), 2, 0), | |
464 | /* | |
62b8bb7a | 465 | * 5: Compare to RTM_DELADDR |
3575d9e8 DS |
466 | */ |
467 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htons(RTM_DELADDR), 1, 0), | |
468 | /* | |
62b8bb7a | 469 | * 6: This is the end state of we want to skip the |
3575d9e8 DS |
470 | * message |
471 | */ | |
d62a17ae | 472 | BPF_STMT(BPF_RET | BPF_K, 0), |
62b8bb7a | 473 | /* 7: This is the end state of we want to keep |
3575d9e8 DS |
474 | * the message |
475 | */ | |
d62a17ae | 476 | BPF_STMT(BPF_RET | BPF_K, 0xffff), |
477 | }; | |
478 | ||
479 | struct sock_fprog prog = { | |
9d303b37 | 480 | .len = array_size(filter), .filter = filter, |
d62a17ae | 481 | }; |
482 | ||
483 | if (setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &prog, sizeof(prog)) | |
484 | < 0) | |
1c50c1c0 | 485 | flog_err_sys(EC_LIB_SOCKET, "Can't install socket filter: %s\n", |
9df414fe | 486 | safe_strerror(errno)); |
1fdc9eae | 487 | } |
488 | ||
d62a17ae | 489 | void netlink_parse_rtattr(struct rtattr **tb, int max, struct rtattr *rta, |
490 | int len) | |
1fdc9eae | 491 | { |
d62a17ae | 492 | while (RTA_OK(rta, len)) { |
493 | if (rta->rta_type <= max) | |
494 | tb[rta->rta_type] = rta; | |
495 | rta = RTA_NEXT(rta, len); | |
496 | } | |
1fdc9eae | 497 | } |
498 | ||
87da6a60 SW |
499 | /** |
500 | * netlink_parse_rtattr_nested() - Parses a nested route attribute | |
501 | * @tb: Pointer to array for storing rtattr in. | |
502 | * @max: Max number to store. | |
503 | * @rta: Pointer to rtattr to look for nested items in. | |
504 | */ | |
505 | void netlink_parse_rtattr_nested(struct rtattr **tb, int max, | |
506 | struct rtattr *rta) | |
507 | { | |
508 | netlink_parse_rtattr(tb, max, RTA_DATA(rta), RTA_PAYLOAD(rta)); | |
509 | } | |
510 | ||
86391e56 MS |
511 | int addattr_l(struct nlmsghdr *n, unsigned int maxlen, int type, |
512 | const void *data, unsigned int alen) | |
1fdc9eae | 513 | { |
d62a17ae | 514 | int len; |
515 | struct rtattr *rta; | |
1fdc9eae | 516 | |
d62a17ae | 517 | len = RTA_LENGTH(alen); |
1fdc9eae | 518 | |
d62a17ae | 519 | if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) |
520 | return -1; | |
1fdc9eae | 521 | |
d62a17ae | 522 | rta = (struct rtattr *)(((char *)n) + NLMSG_ALIGN(n->nlmsg_len)); |
523 | rta->rta_type = type; | |
524 | rta->rta_len = len; | |
4b2792b5 | 525 | |
d62a17ae | 526 | if (data) |
527 | memcpy(RTA_DATA(rta), data, alen); | |
528 | else | |
529 | assert(alen == 0); | |
4b2792b5 | 530 | |
d62a17ae | 531 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); |
1fdc9eae | 532 | |
d62a17ae | 533 | return 0; |
1fdc9eae | 534 | } |
535 | ||
86391e56 MS |
536 | int rta_addattr_l(struct rtattr *rta, unsigned int maxlen, int type, |
537 | const void *data, unsigned int alen) | |
1fdc9eae | 538 | { |
d62a17ae | 539 | unsigned int len; |
540 | struct rtattr *subrta; | |
1fdc9eae | 541 | |
d62a17ae | 542 | len = RTA_LENGTH(alen); |
1fdc9eae | 543 | |
d62a17ae | 544 | if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) |
545 | return -1; | |
1fdc9eae | 546 | |
d62a17ae | 547 | subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len)); |
548 | subrta->rta_type = type; | |
549 | subrta->rta_len = len; | |
4b2792b5 | 550 | |
d62a17ae | 551 | if (data) |
552 | memcpy(RTA_DATA(subrta), data, alen); | |
553 | else | |
554 | assert(alen == 0); | |
4b2792b5 | 555 | |
d62a17ae | 556 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len); |
1fdc9eae | 557 | |
d62a17ae | 558 | return 0; |
1fdc9eae | 559 | } |
560 | ||
d7c0a89a | 561 | int addattr16(struct nlmsghdr *n, unsigned int maxlen, int type, uint16_t data) |
bbc16902 | 562 | { |
d7c0a89a | 563 | return addattr_l(n, maxlen, type, &data, sizeof(uint16_t)); |
bbc16902 | 564 | } |
565 | ||
d62a17ae | 566 | int addattr32(struct nlmsghdr *n, unsigned int maxlen, int type, int data) |
1fdc9eae | 567 | { |
d7c0a89a | 568 | return addattr_l(n, maxlen, type, &data, sizeof(uint32_t)); |
1fdc9eae | 569 | } |
570 | ||
d62a17ae | 571 | struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type) |
1fdc9eae | 572 | { |
d62a17ae | 573 | struct rtattr *nest = NLMSG_TAIL(n); |
1fdc9eae | 574 | |
d62a17ae | 575 | addattr_l(n, maxlen, type, NULL, 0); |
576 | return nest; | |
1fdc9eae | 577 | } |
578 | ||
d62a17ae | 579 | int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest) |
1fdc9eae | 580 | { |
d7c0a89a | 581 | nest->rta_len = (uint8_t *)NLMSG_TAIL(n) - (uint8_t *)nest; |
d62a17ae | 582 | return n->nlmsg_len; |
1fdc9eae | 583 | } |
584 | ||
d62a17ae | 585 | struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type) |
1fdc9eae | 586 | { |
d62a17ae | 587 | struct rtattr *nest = RTA_TAIL(rta); |
1fdc9eae | 588 | |
d62a17ae | 589 | rta_addattr_l(rta, maxlen, type, NULL, 0); |
590 | return nest; | |
1fdc9eae | 591 | } |
592 | ||
d62a17ae | 593 | int rta_nest_end(struct rtattr *rta, struct rtattr *nest) |
1fdc9eae | 594 | { |
d7c0a89a | 595 | nest->rta_len = (uint8_t *)RTA_TAIL(rta) - (uint8_t *)nest; |
d62a17ae | 596 | return rta->rta_len; |
1fdc9eae | 597 | } |
598 | ||
d62a17ae | 599 | const char *nl_msg_type_to_str(uint16_t msg_type) |
1fdc9eae | 600 | { |
d62a17ae | 601 | return lookup_msg(nlmsg_str, msg_type, ""); |
1fdc9eae | 602 | } |
603 | ||
d7c0a89a | 604 | const char *nl_rtproto_to_str(uint8_t rtproto) |
1fdc9eae | 605 | { |
d62a17ae | 606 | return lookup_msg(rtproto_str, rtproto, ""); |
1fdc9eae | 607 | } |
b339bde7 | 608 | |
d7c0a89a | 609 | const char *nl_family_to_str(uint8_t family) |
b339bde7 | 610 | { |
d62a17ae | 611 | return lookup_msg(family_str, family, ""); |
b339bde7 DS |
612 | } |
613 | ||
d7c0a89a | 614 | const char *nl_rttype_to_str(uint8_t rttype) |
b339bde7 | 615 | { |
d62a17ae | 616 | return lookup_msg(rttype_str, rttype, ""); |
b339bde7 DS |
617 | } |
618 | ||
4cebb2b6 | 619 | #define NLA_OK(nla, len) \ |
5d307d5d DS |
620 | ((len) >= (int)sizeof(struct nlattr) \ |
621 | && (nla)->nla_len >= sizeof(struct nlattr) \ | |
622 | && (nla)->nla_len <= (len)) | |
4cebb2b6 SW |
623 | #define NLA_NEXT(nla, attrlen) \ |
624 | ((attrlen) -= NLA_ALIGN((nla)->nla_len), \ | |
625 | (struct nlattr *)(((char *)(nla)) + NLA_ALIGN((nla)->nla_len))) | |
626 | #define NLA_LENGTH(len) (NLA_ALIGN(sizeof(struct nlattr)) + (len)) | |
627 | #define NLA_DATA(nla) ((struct nlattr *)(((char *)(nla)) + NLA_LENGTH(0))) | |
628 | ||
629 | #define ERR_NLA(err, inner_len) \ | |
630 | ((struct nlattr *)(((char *)(err)) \ | |
631 | + NLMSG_ALIGN(sizeof(struct nlmsgerr)) \ | |
632 | + NLMSG_ALIGN((inner_len)))) | |
5d307d5d DS |
633 | |
634 | static void netlink_parse_nlattr(struct nlattr **tb, int max, | |
635 | struct nlattr *nla, int len) | |
636 | { | |
4cebb2b6 | 637 | while (NLA_OK(nla, len)) { |
5d307d5d DS |
638 | if (nla->nla_type <= max) |
639 | tb[nla->nla_type] = nla; | |
4cebb2b6 | 640 | nla = NLA_NEXT(nla, len); |
5d307d5d DS |
641 | } |
642 | } | |
643 | ||
644 | static void netlink_parse_extended_ack(struct nlmsghdr *h) | |
645 | { | |
4cebb2b6 SW |
646 | struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {}; |
647 | const struct nlmsgerr *err = (const struct nlmsgerr *)NLMSG_DATA(h); | |
5d307d5d | 648 | const struct nlmsghdr *err_nlh = NULL; |
4cebb2b6 SW |
649 | /* Length not including nlmsghdr */ |
650 | uint32_t len = 0; | |
651 | /* Inner error netlink message length */ | |
652 | uint32_t inner_len = 0; | |
5d307d5d DS |
653 | const char *msg = NULL; |
654 | uint32_t off = 0; | |
655 | ||
656 | if (!(h->nlmsg_flags & NLM_F_CAPPED)) | |
4cebb2b6 SW |
657 | inner_len = (uint32_t)NLMSG_PAYLOAD(&err->msg, 0); |
658 | ||
659 | len = (uint32_t)(NLMSG_PAYLOAD(h, sizeof(struct nlmsgerr)) - inner_len); | |
5d307d5d | 660 | |
4cebb2b6 SW |
661 | netlink_parse_nlattr(tb, NLMSGERR_ATTR_MAX, ERR_NLA(err, inner_len), |
662 | len); | |
5d307d5d DS |
663 | |
664 | if (tb[NLMSGERR_ATTR_MSG]) | |
4cebb2b6 | 665 | msg = (const char *)NLA_DATA(tb[NLMSGERR_ATTR_MSG]); |
5d307d5d DS |
666 | |
667 | if (tb[NLMSGERR_ATTR_OFFS]) { | |
4cebb2b6 | 668 | off = *(uint32_t *)NLA_DATA(tb[NLMSGERR_ATTR_OFFS]); |
5d307d5d DS |
669 | |
670 | if (off > h->nlmsg_len) { | |
9165c5f5 | 671 | zlog_err("Invalid offset for NLMSGERR_ATTR_OFFS"); |
5d307d5d DS |
672 | } else if (!(h->nlmsg_flags & NLM_F_CAPPED)) { |
673 | /* | |
674 | * Header of failed message | |
675 | * we are not doing anything currently with it | |
676 | * but noticing it for later. | |
677 | */ | |
678 | err_nlh = &err->msg; | |
87b5d1b0 DS |
679 | zlog_debug("%s: Received %s extended Ack", |
680 | __PRETTY_FUNCTION__, | |
681 | nl_msg_type_to_str(err_nlh->nlmsg_type)); | |
5d307d5d DS |
682 | } |
683 | } | |
684 | ||
685 | if (msg && *msg != '\0') { | |
686 | bool is_err = !!err->error; | |
687 | ||
688 | if (is_err) | |
689 | zlog_err("Extended Error: %s", msg); | |
690 | else | |
e914ccbe | 691 | flog_warn(EC_ZEBRA_NETLINK_EXTENDED_WARNING, |
9df414fe | 692 | "Extended Warning: %s", msg); |
5d307d5d DS |
693 | } |
694 | } | |
695 | ||
936ebf0a DS |
696 | /* |
697 | * netlink_parse_info | |
698 | * | |
699 | * Receive message from netlink interface and pass those information | |
700 | * to the given function. | |
701 | * | |
702 | * filter -> Function to call to read the results | |
703 | * nl -> netlink socket information | |
704 | * zns -> The zebra namespace data | |
705 | * count -> How many we should read in, 0 means as much as possible | |
706 | * startup -> Are we reading in under startup conditions? passed to | |
707 | * the filter. | |
708 | */ | |
2414abd3 | 709 | int netlink_parse_info(int (*filter)(struct nlmsghdr *, ns_id_t, int), |
7cdb1a84 MS |
710 | const struct nlsock *nl, |
711 | const struct zebra_dplane_info *zns, | |
85a75f1e | 712 | int count, int startup) |
1fdc9eae | 713 | { |
d62a17ae | 714 | int status; |
715 | int ret = 0; | |
716 | int error; | |
717 | int read_in = 0; | |
718 | ||
719 | while (1) { | |
9ed7517b | 720 | char buf[NL_RCV_PKT_BUF_SIZE]; |
d62a17ae | 721 | struct iovec iov = {.iov_base = buf, .iov_len = sizeof buf}; |
722 | struct sockaddr_nl snl; | |
723 | struct msghdr msg = {.msg_name = (void *)&snl, | |
724 | .msg_namelen = sizeof snl, | |
725 | .msg_iov = &iov, | |
726 | .msg_iovlen = 1}; | |
727 | struct nlmsghdr *h; | |
728 | ||
729 | if (count && read_in >= count) | |
730 | return 0; | |
731 | ||
acfa8927 | 732 | #if defined(HANDLE_NETLINK_FUZZING) |
81a2f870 SW |
733 | /* Check if reading and filename is set */ |
734 | if (netlink_read && '\0' != netlink_fuzz_file[0]) { | |
735 | zlog_debug("Reading netlink fuzz file"); | |
736 | status = netlink_read_file(buf, netlink_fuzz_file); | |
737 | snl.nl_pid = 0; | |
738 | } else { | |
739 | status = recvmsg(nl->sock, &msg, 0); | |
740 | } | |
741 | #else | |
d62a17ae | 742 | status = recvmsg(nl->sock, &msg, 0); |
acfa8927 | 743 | #endif /* HANDLE_NETLINK_FUZZING */ |
d62a17ae | 744 | if (status < 0) { |
745 | if (errno == EINTR) | |
746 | continue; | |
747 | if (errno == EWOULDBLOCK || errno == EAGAIN) | |
748 | break; | |
e914ccbe | 749 | flog_err(EC_ZEBRA_RECVMSG_OVERRUN, |
1c50c1c0 QY |
750 | "%s recvmsg overrun: %s", nl->name, |
751 | safe_strerror(errno)); | |
d62a17ae | 752 | /* |
753 | * In this case we are screwed. | |
754 | * There is no good way to | |
755 | * recover zebra at this point. | |
756 | */ | |
757 | exit(-1); | |
758 | continue; | |
1fdc9eae | 759 | } |
760 | ||
d62a17ae | 761 | if (status == 0) { |
450971aa | 762 | flog_err_sys(EC_LIB_SOCKET, "%s EOF", nl->name); |
d62a17ae | 763 | return -1; |
764 | } | |
765 | ||
766 | if (msg.msg_namelen != sizeof snl) { | |
e914ccbe | 767 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
1c50c1c0 QY |
768 | "%s sender address length error: length %d", |
769 | nl->name, msg.msg_namelen); | |
d62a17ae | 770 | return -1; |
771 | } | |
772 | ||
773 | if (IS_ZEBRA_DEBUG_KERNEL_MSGDUMP_RECV) { | |
774 | zlog_debug("%s: << netlink message dump [recv]", | |
775 | __func__); | |
776 | zlog_hexdump(buf, status); | |
777 | } | |
778 | ||
acfa8927 | 779 | #if defined(HANDLE_NETLINK_FUZZING) |
81a2f870 SW |
780 | if (!netlink_read) { |
781 | zlog_debug("Writing incoming netlink message"); | |
782 | netlink_write_incoming(buf, status, | |
783 | netlink_file_counter++); | |
784 | } | |
acfa8927 | 785 | #endif /* HANDLE_NETLINK_FUZZING */ |
81a2f870 | 786 | |
d62a17ae | 787 | read_in++; |
788 | for (h = (struct nlmsghdr *)buf; | |
e6a0e0d1 | 789 | (status >= 0 && NLMSG_OK(h, (unsigned int)status)); |
d62a17ae | 790 | h = NLMSG_NEXT(h, status)) { |
791 | /* Finish of reading. */ | |
792 | if (h->nlmsg_type == NLMSG_DONE) | |
793 | return ret; | |
794 | ||
795 | /* Error handling. */ | |
796 | if (h->nlmsg_type == NLMSG_ERROR) { | |
797 | struct nlmsgerr *err = | |
798 | (struct nlmsgerr *)NLMSG_DATA(h); | |
799 | int errnum = err->error; | |
800 | int msg_type = err->msg.nlmsg_type; | |
801 | ||
5d307d5d DS |
802 | if (h->nlmsg_len |
803 | < NLMSG_LENGTH(sizeof(struct nlmsgerr))) { | |
13ec4c1d RZ |
804 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
805 | "%s error: message truncated", | |
5d307d5d DS |
806 | nl->name); |
807 | return -1; | |
808 | } | |
809 | ||
810 | /* | |
811 | * Parse the extended information before | |
812 | * we actually handle it. | |
813 | * At this point in time we do not | |
814 | * do anything other than report the | |
815 | * issue. | |
816 | */ | |
817 | if (h->nlmsg_flags & NLM_F_ACK_TLVS) | |
818 | netlink_parse_extended_ack(h); | |
819 | ||
d62a17ae | 820 | /* If the error field is zero, then this is an |
821 | * ACK */ | |
822 | if (err->error == 0) { | |
823 | if (IS_ZEBRA_DEBUG_KERNEL) { | |
824 | zlog_debug( | |
825 | "%s: %s ACK: type=%s(%u), seq=%u, pid=%u", | |
826 | __FUNCTION__, nl->name, | |
827 | nl_msg_type_to_str( | |
828 | err->msg.nlmsg_type), | |
829 | err->msg.nlmsg_type, | |
830 | err->msg.nlmsg_seq, | |
831 | err->msg.nlmsg_pid); | |
832 | } | |
833 | ||
834 | /* return if not a multipart message, | |
835 | * otherwise continue */ | |
836 | if (!(h->nlmsg_flags & NLM_F_MULTI)) | |
837 | return 0; | |
838 | continue; | |
839 | } | |
840 | ||
d62a17ae | 841 | /* Deal with errors that occur because of races |
842 | * in link handling */ | |
85a75f1e | 843 | if (zns->is_cmd |
d62a17ae | 844 | && ((msg_type == RTM_DELROUTE |
845 | && (-errnum == ENODEV | |
846 | || -errnum == ESRCH)) | |
847 | || (msg_type == RTM_NEWROUTE | |
848 | && (-errnum == ENETDOWN | |
849 | || -errnum == EEXIST)))) { | |
850 | if (IS_ZEBRA_DEBUG_KERNEL) | |
851 | zlog_debug( | |
852 | "%s: error: %s type=%s(%u), seq=%u, pid=%u", | |
853 | nl->name, | |
854 | safe_strerror(-errnum), | |
855 | nl_msg_type_to_str( | |
856 | msg_type), | |
857 | msg_type, | |
858 | err->msg.nlmsg_seq, | |
859 | err->msg.nlmsg_pid); | |
860 | return 0; | |
861 | } | |
862 | ||
863 | /* We see RTM_DELNEIGH when shutting down an | |
864 | * interface with an IPv4 | |
865 | * link-local. The kernel should have already | |
866 | * deleted the neighbor | |
867 | * so do not log these as an error. | |
868 | */ | |
869 | if (msg_type == RTM_DELNEIGH | |
85a75f1e | 870 | || (zns->is_cmd && msg_type == RTM_NEWROUTE |
d62a17ae | 871 | && (-errnum == ESRCH |
872 | || -errnum == ENETUNREACH))) { | |
873 | /* This is known to happen in some | |
874 | * situations, don't log | |
875 | * as error. | |
876 | */ | |
877 | if (IS_ZEBRA_DEBUG_KERNEL) | |
878 | zlog_debug( | |
879 | "%s error: %s, type=%s(%u), seq=%u, pid=%u", | |
880 | nl->name, | |
881 | safe_strerror(-errnum), | |
882 | nl_msg_type_to_str( | |
883 | msg_type), | |
884 | msg_type, | |
885 | err->msg.nlmsg_seq, | |
886 | err->msg.nlmsg_pid); | |
887 | } else | |
af4c2728 | 888 | flog_err( |
e914ccbe | 889 | EC_ZEBRA_UNEXPECTED_MESSAGE, |
d62a17ae | 890 | "%s error: %s, type=%s(%u), seq=%u, pid=%u", |
891 | nl->name, | |
892 | safe_strerror(-errnum), | |
893 | nl_msg_type_to_str(msg_type), | |
894 | msg_type, err->msg.nlmsg_seq, | |
895 | err->msg.nlmsg_pid); | |
896 | ||
897 | return -1; | |
898 | } | |
899 | ||
900 | /* OK we got netlink message. */ | |
901 | if (IS_ZEBRA_DEBUG_KERNEL) | |
902 | zlog_debug( | |
903 | "netlink_parse_info: %s type %s(%u), len=%d, seq=%u, pid=%u", | |
904 | nl->name, | |
905 | nl_msg_type_to_str(h->nlmsg_type), | |
906 | h->nlmsg_type, h->nlmsg_len, | |
907 | h->nlmsg_seq, h->nlmsg_pid); | |
908 | ||
783827ae DS |
909 | |
910 | /* | |
911 | * Ignore messages that maybe sent from | |
912 | * other actors besides the kernel | |
913 | */ | |
914 | if (snl.nl_pid != 0) { | |
43e52561 QY |
915 | zlog_debug("Ignoring message from pid %u", |
916 | snl.nl_pid); | |
d62a17ae | 917 | continue; |
918 | } | |
919 | ||
2414abd3 | 920 | error = (*filter)(h, zns->ns_id, startup); |
d62a17ae | 921 | if (error < 0) { |
9df414fe QY |
922 | zlog_debug("%s filter function error", |
923 | nl->name); | |
d62a17ae | 924 | ret = error; |
925 | } | |
926 | } | |
927 | ||
928 | /* After error care. */ | |
929 | if (msg.msg_flags & MSG_TRUNC) { | |
e914ccbe | 930 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
1c50c1c0 | 931 | "%s error: message truncated", nl->name); |
d62a17ae | 932 | continue; |
933 | } | |
934 | if (status) { | |
e914ccbe | 935 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
1c50c1c0 QY |
936 | "%s error: data remnant size %d", nl->name, |
937 | status); | |
d62a17ae | 938 | return -1; |
939 | } | |
940 | } | |
941 | return ret; | |
1fdc9eae | 942 | } |
943 | ||
936ebf0a | 944 | /* |
7cdb1a84 | 945 | * netlink_talk_info |
936ebf0a DS |
946 | * |
947 | * sendmsg() to netlink socket then recvmsg(). | |
948 | * Calls netlink_parse_info to parse returned data | |
949 | * | |
950 | * filter -> The filter to read final results from kernel | |
951 | * nlmsghdr -> The data to send to the kernel | |
8b962e77 | 952 | * dp_info -> The dataplane and netlink socket information |
936ebf0a DS |
953 | * startup -> Are we reading in under startup conditions |
954 | * This is passed through eventually to filter. | |
955 | */ | |
7cdb1a84 MS |
956 | int netlink_talk_info(int (*filter)(struct nlmsghdr *, ns_id_t, int startup), |
957 | struct nlmsghdr *n, | |
958 | const struct zebra_dplane_info *dp_info, int startup) | |
1fdc9eae | 959 | { |
8d2dcc85 | 960 | int status = 0; |
d62a17ae | 961 | struct sockaddr_nl snl; |
cbaca6a1 DS |
962 | struct iovec iov; |
963 | struct msghdr msg; | |
8d2dcc85 | 964 | int save_errno = 0; |
7cdb1a84 | 965 | const struct nlsock *nl; |
d62a17ae | 966 | |
967 | memset(&snl, 0, sizeof snl); | |
cbaca6a1 DS |
968 | memset(&iov, 0, sizeof iov); |
969 | memset(&msg, 0, sizeof msg); | |
970 | ||
971 | iov.iov_base = n; | |
972 | iov.iov_len = n->nlmsg_len; | |
973 | msg.msg_name = (void *)&snl; | |
974 | msg.msg_namelen = sizeof snl; | |
975 | msg.msg_iov = &iov; | |
976 | msg.msg_iovlen = 1; | |
977 | ||
d62a17ae | 978 | snl.nl_family = AF_NETLINK; |
979 | ||
7cdb1a84 MS |
980 | nl = &(dp_info->nls); |
981 | n->nlmsg_seq = nl->seq; | |
d62a17ae | 982 | n->nlmsg_pid = nl->snl.nl_pid; |
983 | ||
d62a17ae | 984 | if (IS_ZEBRA_DEBUG_KERNEL) |
985 | zlog_debug( | |
986 | "netlink_talk: %s type %s(%u), len=%d seq=%u flags 0x%x", | |
987 | nl->name, nl_msg_type_to_str(n->nlmsg_type), | |
988 | n->nlmsg_type, n->nlmsg_len, n->nlmsg_seq, | |
989 | n->nlmsg_flags); | |
990 | ||
991 | /* Send message to netlink interface. */ | |
0cf6db21 | 992 | frr_with_privs(&zserv_privs) { |
01b9e3fd DL |
993 | status = sendmsg(nl->sock, &msg, 0); |
994 | save_errno = errno; | |
995 | } | |
d62a17ae | 996 | |
997 | if (IS_ZEBRA_DEBUG_KERNEL_MSGDUMP_SEND) { | |
998 | zlog_debug("%s: >> netlink message dump [sent]", __func__); | |
999 | zlog_hexdump(n, n->nlmsg_len); | |
1000 | } | |
1001 | ||
1002 | if (status < 0) { | |
450971aa | 1003 | flog_err_sys(EC_LIB_SOCKET, "netlink_talk sendmsg() error: %s", |
09c866e3 | 1004 | safe_strerror(save_errno)); |
d62a17ae | 1005 | return -1; |
1006 | } | |
1007 | ||
d62a17ae | 1008 | /* |
1009 | * Get reply from netlink socket. | |
1010 | * The reply should either be an acknowlegement or an error. | |
1011 | */ | |
7cdb1a84 MS |
1012 | return netlink_parse_info(filter, nl, dp_info, 0, startup); |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * Synchronous version of netlink_talk_info. Converts args to suit the | |
1017 | * common version, which is suitable for both sync and async use. | |
7cdb1a84 MS |
1018 | */ |
1019 | int netlink_talk(int (*filter)(struct nlmsghdr *, ns_id_t, int startup), | |
1020 | struct nlmsghdr *n, struct nlsock *nl, struct zebra_ns *zns, | |
1021 | int startup) | |
1022 | { | |
1023 | struct zebra_dplane_info dp_info; | |
1024 | ||
1025 | /* Increment sequence number before capturing snapshot of ns socket | |
1026 | * info. | |
1027 | */ | |
1028 | nl->seq++; | |
1029 | ||
1030 | /* Capture info in intermediate info struct */ | |
85a75f1e | 1031 | zebra_dplane_info_from_zns(&dp_info, zns, (nl == &(zns->netlink_cmd))); |
7cdb1a84 | 1032 | |
5709131c | 1033 | return netlink_talk_info(filter, n, &dp_info, startup); |
1fdc9eae | 1034 | } |
1035 | ||
289602d7 | 1036 | /* Issue request message to kernel via netlink socket. GET messages |
1037 | * are issued through this interface. | |
1038 | */ | |
d62a17ae | 1039 | int netlink_request(struct nlsock *nl, struct nlmsghdr *n) |
1fdc9eae | 1040 | { |
d62a17ae | 1041 | int ret; |
1042 | struct sockaddr_nl snl; | |
d62a17ae | 1043 | |
1044 | /* Check netlink socket. */ | |
1045 | if (nl->sock < 0) { | |
450971aa | 1046 | flog_err_sys(EC_LIB_SOCKET, "%s socket isn't active.", |
09c866e3 | 1047 | nl->name); |
d62a17ae | 1048 | return -1; |
1049 | } | |
1050 | ||
1051 | /* Fill common fields for all requests. */ | |
d62a17ae | 1052 | n->nlmsg_pid = nl->snl.nl_pid; |
1053 | n->nlmsg_seq = ++nl->seq; | |
1054 | ||
1055 | memset(&snl, 0, sizeof snl); | |
1056 | snl.nl_family = AF_NETLINK; | |
1057 | ||
1058 | /* Raise capabilities and send message, then lower capabilities. */ | |
0cf6db21 | 1059 | frr_with_privs(&zserv_privs) { |
6bb30c2c DL |
1060 | ret = sendto(nl->sock, (void *)n, n->nlmsg_len, 0, |
1061 | (struct sockaddr *)&snl, sizeof snl); | |
d62a17ae | 1062 | } |
1063 | ||
d62a17ae | 1064 | if (ret < 0) { |
6bb30c2c DL |
1065 | zlog_err("%s sendto failed: %s", nl->name, |
1066 | safe_strerror(errno)); | |
d62a17ae | 1067 | return -1; |
1068 | } | |
1069 | ||
1070 | return 0; | |
1fdc9eae | 1071 | } |
1072 | ||
1073 | /* Exported interface function. This function simply calls | |
1074 | netlink_socket (). */ | |
d62a17ae | 1075 | void kernel_init(struct zebra_ns *zns) |
1fdc9eae | 1076 | { |
d62a17ae | 1077 | unsigned long groups; |
5d307d5d DS |
1078 | #if defined SOL_NETLINK |
1079 | int one, ret; | |
1080 | #endif | |
d62a17ae | 1081 | |
026a316f DS |
1082 | /* |
1083 | * Initialize netlink sockets | |
1084 | * | |
1085 | * If RTMGRP_XXX exists use that, but at some point | |
1086 | * I think the kernel developers realized that | |
1087 | * keeping track of all the different values would | |
1088 | * lead to confusion, so we need to convert the | |
1089 | * RTNLGRP_XXX to a bit position for ourself | |
1090 | */ | |
1091 | groups = RTMGRP_LINK | | |
1092 | RTMGRP_IPV4_ROUTE | | |
1093 | RTMGRP_IPV4_IFADDR | | |
1094 | RTMGRP_IPV6_ROUTE | | |
1095 | RTMGRP_IPV6_IFADDR | | |
1096 | RTMGRP_IPV4_MROUTE | | |
1097 | RTMGRP_NEIGH | | |
1098 | (1 << (RTNLGRP_IPV4_RULE - 1)) | | |
da0ad5cf SW |
1099 | (1 << (RTNLGRP_IPV6_RULE - 1)) | |
1100 | (1 << (RTNLGRP_NEXTHOP - 1)); | |
d62a17ae | 1101 | |
1102 | snprintf(zns->netlink.name, sizeof(zns->netlink.name), | |
1103 | "netlink-listen (NS %u)", zns->ns_id); | |
1104 | zns->netlink.sock = -1; | |
19d5a4fe DS |
1105 | if (netlink_socket(&zns->netlink, groups, zns->ns_id) < 0) { |
1106 | zlog_err("Failure to create %s socket", | |
1107 | zns->netlink.name); | |
1108 | exit(-1); | |
1109 | } | |
d62a17ae | 1110 | |
1111 | snprintf(zns->netlink_cmd.name, sizeof(zns->netlink_cmd.name), | |
1112 | "netlink-cmd (NS %u)", zns->ns_id); | |
1113 | zns->netlink_cmd.sock = -1; | |
19d5a4fe DS |
1114 | if (netlink_socket(&zns->netlink_cmd, 0, zns->ns_id) < 0) { |
1115 | zlog_err("Failure to create %s socket", | |
1116 | zns->netlink_cmd.name); | |
1117 | exit(-1); | |
1118 | } | |
d62a17ae | 1119 | |
62b8bb7a MS |
1120 | snprintf(zns->netlink_dplane.name, sizeof(zns->netlink_dplane.name), |
1121 | "netlink-dp (NS %u)", zns->ns_id); | |
1122 | zns->netlink_dplane.sock = -1; | |
1123 | if (netlink_socket(&zns->netlink_dplane, 0, zns->ns_id) < 0) { | |
1124 | zlog_err("Failure to create %s socket", | |
1125 | zns->netlink_dplane.name); | |
1126 | exit(-1); | |
1127 | } | |
1128 | ||
5d307d5d DS |
1129 | /* |
1130 | * SOL_NETLINK is not available on all platforms yet | |
1131 | * apparently. It's in bits/socket.h which I am not | |
1132 | * sure that we want to pull into our build system. | |
1133 | */ | |
1134 | #if defined SOL_NETLINK | |
1135 | /* | |
1136 | * Let's tell the kernel that we want to receive extended | |
62b8bb7a | 1137 | * ACKS over our command socket(s) |
5d307d5d DS |
1138 | */ |
1139 | one = 1; | |
1140 | ret = setsockopt(zns->netlink_cmd.sock, SOL_NETLINK, NETLINK_EXT_ACK, | |
1141 | &one, sizeof(one)); | |
1142 | ||
1143 | if (ret < 0) | |
62b8bb7a MS |
1144 | zlog_notice("Registration for extended cmd ACK failed : %d %s", |
1145 | errno, safe_strerror(errno)); | |
1146 | ||
1147 | one = 1; | |
1148 | ret = setsockopt(zns->netlink_dplane.sock, SOL_NETLINK, NETLINK_EXT_ACK, | |
1149 | &one, sizeof(one)); | |
1150 | ||
1151 | if (ret < 0) | |
1152 | zlog_notice("Registration for extended dp ACK failed : %d %s", | |
5d307d5d DS |
1153 | errno, safe_strerror(errno)); |
1154 | #endif | |
1155 | ||
d62a17ae | 1156 | /* Register kernel socket. */ |
19d5a4fe | 1157 | if (fcntl(zns->netlink.sock, F_SETFL, O_NONBLOCK) < 0) |
450971aa | 1158 | flog_err_sys(EC_LIB_SOCKET, "Can't set %s socket flags: %s", |
09c866e3 | 1159 | zns->netlink.name, safe_strerror(errno)); |
8c85e8ea DS |
1160 | |
1161 | if (fcntl(zns->netlink_cmd.sock, F_SETFL, O_NONBLOCK) < 0) | |
1162 | zlog_err("Can't set %s socket error: %s(%d)", | |
1163 | zns->netlink_cmd.name, safe_strerror(errno), errno); | |
19d5a4fe | 1164 | |
62b8bb7a MS |
1165 | if (fcntl(zns->netlink_dplane.sock, F_SETFL, O_NONBLOCK) < 0) |
1166 | zlog_err("Can't set %s socket error: %s(%d)", | |
1167 | zns->netlink_dplane.name, safe_strerror(errno), errno); | |
1168 | ||
19d5a4fe DS |
1169 | /* Set receive buffer size if it's set from command line */ |
1170 | if (nl_rcvbufsize) | |
1171 | netlink_recvbuf(&zns->netlink, nl_rcvbufsize); | |
1172 | ||
1173 | netlink_install_filter(zns->netlink.sock, | |
62b8bb7a MS |
1174 | zns->netlink_cmd.snl.nl_pid, |
1175 | zns->netlink_dplane.snl.nl_pid); | |
1176 | ||
19d5a4fe DS |
1177 | zns->t_netlink = NULL; |
1178 | ||
3801e764 | 1179 | thread_add_read(zrouter.master, kernel_read, zns, |
19d5a4fe | 1180 | zns->netlink.sock, &zns->t_netlink); |
d62a17ae | 1181 | |
1182 | rt_netlink_init(); | |
1fdc9eae | 1183 | } |
1184 | ||
62b8bb7a | 1185 | void kernel_terminate(struct zebra_ns *zns, bool complete) |
1fdc9eae | 1186 | { |
d62a17ae | 1187 | THREAD_READ_OFF(zns->t_netlink); |
1188 | ||
1189 | if (zns->netlink.sock >= 0) { | |
1190 | close(zns->netlink.sock); | |
1191 | zns->netlink.sock = -1; | |
1192 | } | |
1193 | ||
1194 | if (zns->netlink_cmd.sock >= 0) { | |
1195 | close(zns->netlink_cmd.sock); | |
1196 | zns->netlink_cmd.sock = -1; | |
1197 | } | |
ddfeb486 | 1198 | |
62b8bb7a MS |
1199 | /* During zebra shutdown, we need to leave the dataplane socket |
1200 | * around until all work is done. | |
1201 | */ | |
1202 | if (complete) { | |
1203 | if (zns->netlink_dplane.sock >= 0) { | |
1204 | close(zns->netlink_dplane.sock); | |
1205 | zns->netlink_dplane.sock = -1; | |
1206 | } | |
1207 | } | |
1208 | } | |
ddfeb486 | 1209 | #endif /* HAVE_NETLINK */ |