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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 | ||
ddfeb486 DL |
23 | #ifdef HAVE_NETLINK |
24 | ||
1fdc9eae | 25 | #include "linklist.h" |
26 | #include "if.h" | |
27 | #include "log.h" | |
28 | #include "prefix.h" | |
29 | #include "connected.h" | |
30 | #include "table.h" | |
31 | #include "memory.h" | |
1fdc9eae | 32 | #include "rib.h" |
33 | #include "thread.h" | |
34 | #include "privs.h" | |
35 | #include "nexthop.h" | |
36 | #include "vrf.h" | |
37 | #include "mpls.h" | |
174482ef | 38 | #include "lib_errors.h" |
1fdc9eae | 39 | |
3801e764 DS |
40 | //#include "zebra/zserv.h" |
41 | #include "zebra/zebra_router.h" | |
1fdc9eae | 42 | #include "zebra/zebra_ns.h" |
43 | #include "zebra/zebra_vrf.h" | |
05f7f5db | 44 | #include "zebra/rt.h" |
1fdc9eae | 45 | #include "zebra/debug.h" |
46 | #include "zebra/kernel_netlink.h" | |
47 | #include "zebra/rt_netlink.h" | |
48 | #include "zebra/if_netlink.h" | |
942bf97b | 49 | #include "zebra/rule_netlink.h" |
43e52561 | 50 | #include "zebra/zebra_errors.h" |
1fdc9eae | 51 | |
52 | #ifndef SO_RCVBUFFORCE | |
53 | #define SO_RCVBUFFORCE (33) | |
54 | #endif | |
55 | ||
56 | /* Hack for GNU libc version 2. */ | |
57 | #ifndef MSG_TRUNC | |
58 | #define MSG_TRUNC 0x20 | |
59 | #endif /* MSG_TRUNC */ | |
60 | ||
61 | #ifndef NLMSG_TAIL | |
d62a17ae | 62 | #define NLMSG_TAIL(nmsg) \ |
d7c0a89a QY |
63 | ((struct rtattr *)(((uint8_t *)(nmsg)) \ |
64 | + NLMSG_ALIGN((nmsg)->nlmsg_len))) | |
1fdc9eae | 65 | #endif |
66 | ||
67 | #ifndef RTA_TAIL | |
d62a17ae | 68 | #define RTA_TAIL(rta) \ |
d7c0a89a | 69 | ((struct rtattr *)(((uint8_t *)(rta)) + RTA_ALIGN((rta)->rta_len))) |
1fdc9eae | 70 | #endif |
71 | ||
f909c673 DS |
72 | #ifndef RTNL_FAMILY_IP6MR |
73 | #define RTNL_FAMILY_IP6MR 129 | |
74 | #endif | |
75 | ||
76 | #ifndef RTPROT_MROUTED | |
77 | #define RTPROT_MROUTED 17 | |
78 | #endif | |
79 | ||
531c92b8 | 80 | #define NL_DEFAULT_BATCH_BUFSIZE (16 * NL_PKT_BUF_SIZE) |
e63c7622 JU |
81 | |
82 | /* | |
83 | * We limit the batch's size to a number smaller than the length of the | |
84 | * underlying buffer since the last message that wouldn't fit the batch would go | |
85 | * over the upper boundary and then it would have to be encoded again into a new | |
86 | * buffer. If the difference between the limit and the length of the buffer is | |
87 | * big enough (bigger than the biggest Netlink message) then this situation | |
88 | * won't occur. | |
89 | */ | |
531c92b8 JU |
90 | #define NL_DEFAULT_BATCH_SEND_THRESHOLD (15 * NL_PKT_BUF_SIZE) |
91 | ||
2f9dbd3a | 92 | #define NL_BATCH_RX_BUFSIZE NL_RCV_PKT_BUF_SIZE |
e63c7622 | 93 | |
d62a17ae | 94 | static const struct message nlmsg_str[] = {{RTM_NEWROUTE, "RTM_NEWROUTE"}, |
95 | {RTM_DELROUTE, "RTM_DELROUTE"}, | |
96 | {RTM_GETROUTE, "RTM_GETROUTE"}, | |
97 | {RTM_NEWLINK, "RTM_NEWLINK"}, | |
98 | {RTM_DELLINK, "RTM_DELLINK"}, | |
99 | {RTM_GETLINK, "RTM_GETLINK"}, | |
100 | {RTM_NEWADDR, "RTM_NEWADDR"}, | |
101 | {RTM_DELADDR, "RTM_DELADDR"}, | |
102 | {RTM_GETADDR, "RTM_GETADDR"}, | |
103 | {RTM_NEWNEIGH, "RTM_NEWNEIGH"}, | |
104 | {RTM_DELNEIGH, "RTM_DELNEIGH"}, | |
105 | {RTM_GETNEIGH, "RTM_GETNEIGH"}, | |
942bf97b | 106 | {RTM_NEWRULE, "RTM_NEWRULE"}, |
107 | {RTM_DELRULE, "RTM_DELRULE"}, | |
108 | {RTM_GETRULE, "RTM_GETRULE"}, | |
79580b5a SW |
109 | {RTM_NEWNEXTHOP, "RTM_NEWNEXTHOP"}, |
110 | {RTM_DELNEXTHOP, "RTM_DELNEXTHOP"}, | |
111 | {RTM_GETNEXTHOP, "RTM_GETNEXTHOP"}, | |
d62a17ae | 112 | {0}}; |
1fdc9eae | 113 | |
114 | static const struct message rtproto_str[] = { | |
d62a17ae | 115 | {RTPROT_REDIRECT, "redirect"}, |
116 | {RTPROT_KERNEL, "kernel"}, | |
117 | {RTPROT_BOOT, "boot"}, | |
118 | {RTPROT_STATIC, "static"}, | |
119 | {RTPROT_GATED, "GateD"}, | |
120 | {RTPROT_RA, "router advertisement"}, | |
121 | {RTPROT_MRT, "MRT"}, | |
122 | {RTPROT_ZEBRA, "Zebra"}, | |
1fdc9eae | 123 | #ifdef RTPROT_BIRD |
d62a17ae | 124 | {RTPROT_BIRD, "BIRD"}, |
1fdc9eae | 125 | #endif /* RTPROT_BIRD */ |
d62a17ae | 126 | {RTPROT_MROUTED, "mroute"}, |
127 | {RTPROT_BGP, "BGP"}, | |
128 | {RTPROT_OSPF, "OSPF"}, | |
129 | {RTPROT_ISIS, "IS-IS"}, | |
130 | {RTPROT_RIP, "RIP"}, | |
131 | {RTPROT_RIPNG, "RIPNG"}, | |
d4d71f11 | 132 | {RTPROT_ZSTATIC, "static"}, |
d62a17ae | 133 | {0}}; |
134 | ||
135 | static const struct message family_str[] = {{AF_INET, "ipv4"}, | |
136 | {AF_INET6, "ipv6"}, | |
137 | {AF_BRIDGE, "bridge"}, | |
138 | {RTNL_FAMILY_IPMR, "ipv4MR"}, | |
139 | {RTNL_FAMILY_IP6MR, "ipv6MR"}, | |
140 | {0}}; | |
141 | ||
8c8f250b DS |
142 | static const struct message rttype_str[] = {{RTN_UNSPEC, "none"}, |
143 | {RTN_UNICAST, "unicast"}, | |
144 | {RTN_LOCAL, "local"}, | |
145 | {RTN_BROADCAST, "broadcast"}, | |
146 | {RTN_ANYCAST, "anycast"}, | |
d62a17ae | 147 | {RTN_MULTICAST, "multicast"}, |
8c8f250b DS |
148 | {RTN_BLACKHOLE, "blackhole"}, |
149 | {RTN_UNREACHABLE, "unreachable"}, | |
150 | {RTN_PROHIBIT, "prohibited"}, | |
151 | {RTN_THROW, "throw"}, | |
152 | {RTN_NAT, "nat"}, | |
153 | {RTN_XRESOLVE, "resolver"}, | |
d62a17ae | 154 | {0}}; |
b339bde7 | 155 | |
1fdc9eae | 156 | extern struct thread_master *master; |
d7c0a89a | 157 | extern uint32_t nl_rcvbufsize; |
1fdc9eae | 158 | |
159 | extern struct zebra_privs_t zserv_privs; | |
160 | ||
bf8d3d6a | 161 | DEFINE_MTYPE_STATIC(ZEBRA, NL_BUF, "Zebra Netlink buffers"); |
531c92b8 JU |
162 | |
163 | size_t nl_batch_tx_bufsize; | |
164 | char *nl_batch_tx_buf; | |
165 | ||
e63c7622 JU |
166 | char nl_batch_rx_buf[NL_BATCH_RX_BUFSIZE]; |
167 | ||
531c92b8 JU |
168 | _Atomic uint32_t nl_batch_bufsize = NL_DEFAULT_BATCH_BUFSIZE; |
169 | _Atomic uint32_t nl_batch_send_threshold = NL_DEFAULT_BATCH_SEND_THRESHOLD; | |
170 | ||
e63c7622 JU |
171 | struct nl_batch { |
172 | void *buf; | |
173 | size_t bufsiz; | |
174 | size_t limit; | |
175 | ||
176 | void *buf_head; | |
177 | size_t curlen; | |
178 | size_t msgcnt; | |
179 | ||
180 | const struct zebra_dplane_info *zns; | |
e63c7622 | 181 | |
f6feb48b | 182 | struct dplane_ctx_q ctx_list; |
e63c7622 | 183 | |
f6feb48b JU |
184 | /* |
185 | * Pointer to the queue of completed contexts outbound back | |
186 | * towards the dataplane module. | |
187 | */ | |
188 | struct dplane_ctx_q *ctx_out_q; | |
e63c7622 JU |
189 | }; |
190 | ||
531c92b8 JU |
191 | int netlink_config_write_helper(struct vty *vty) |
192 | { | |
193 | uint32_t size = | |
194 | atomic_load_explicit(&nl_batch_bufsize, memory_order_relaxed); | |
195 | uint32_t threshold = atomic_load_explicit(&nl_batch_send_threshold, | |
196 | memory_order_relaxed); | |
197 | ||
198 | if (size != NL_DEFAULT_BATCH_BUFSIZE | |
199 | || threshold != NL_DEFAULT_BATCH_SEND_THRESHOLD) | |
200 | vty_out(vty, "zebra kernel netlink batch-tx-buf %u %u\n", size, | |
201 | threshold); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | void netlink_set_batch_buffer_size(uint32_t size, uint32_t threshold, bool set) | |
207 | { | |
208 | if (!set) { | |
209 | size = NL_DEFAULT_BATCH_BUFSIZE; | |
210 | threshold = NL_DEFAULT_BATCH_SEND_THRESHOLD; | |
211 | } | |
212 | ||
213 | atomic_store_explicit(&nl_batch_bufsize, size, memory_order_relaxed); | |
214 | atomic_store_explicit(&nl_batch_send_threshold, threshold, | |
215 | memory_order_relaxed); | |
216 | } | |
217 | ||
2414abd3 | 218 | int netlink_talk_filter(struct nlmsghdr *h, ns_id_t ns_id, int startup) |
1fdc9eae | 219 | { |
3575d9e8 DS |
220 | /* |
221 | * This is an error condition that must be handled during | |
222 | * development. | |
223 | * | |
224 | * The netlink_talk_filter function is used for communication | |
225 | * down the netlink_cmd pipe and we are expecting | |
226 | * an ack being received. So if we get here | |
227 | * then we did not receive the ack and instead | |
228 | * received some other message in an unexpected | |
229 | * way. | |
230 | */ | |
43e52561 QY |
231 | zlog_debug("%s: ignoring message type 0x%04x(%s) NS %u", __func__, |
232 | h->nlmsg_type, nl_msg_type_to_str(h->nlmsg_type), ns_id); | |
d62a17ae | 233 | return 0; |
1fdc9eae | 234 | } |
235 | ||
d62a17ae | 236 | static int netlink_recvbuf(struct nlsock *nl, uint32_t newsize) |
1fdc9eae | 237 | { |
d7c0a89a | 238 | uint32_t oldsize; |
d62a17ae | 239 | socklen_t newlen = sizeof(newsize); |
240 | socklen_t oldlen = sizeof(oldsize); | |
241 | int ret; | |
242 | ||
243 | ret = getsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &oldsize, &oldlen); | |
244 | if (ret < 0) { | |
450971aa | 245 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
246 | "Can't get %s receive buffer size: %s", nl->name, |
247 | safe_strerror(errno)); | |
d62a17ae | 248 | return -1; |
249 | } | |
250 | ||
251 | /* Try force option (linux >= 2.6.14) and fall back to normal set */ | |
0cf6db21 | 252 | frr_with_privs(&zserv_privs) { |
01b9e3fd DL |
253 | ret = setsockopt(nl->sock, SOL_SOCKET, SO_RCVBUFFORCE, |
254 | &nl_rcvbufsize, | |
255 | sizeof(nl_rcvbufsize)); | |
256 | } | |
d62a17ae | 257 | if (ret < 0) |
258 | ret = setsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, | |
259 | &nl_rcvbufsize, sizeof(nl_rcvbufsize)); | |
260 | if (ret < 0) { | |
450971aa | 261 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
262 | "Can't set %s receive buffer size: %s", nl->name, |
263 | safe_strerror(errno)); | |
d62a17ae | 264 | return -1; |
265 | } | |
266 | ||
267 | ret = getsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &newsize, &newlen); | |
268 | if (ret < 0) { | |
450971aa | 269 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
270 | "Can't get %s receive buffer size: %s", nl->name, |
271 | safe_strerror(errno)); | |
d62a17ae | 272 | return -1; |
273 | } | |
d62a17ae | 274 | return 0; |
1fdc9eae | 275 | } |
276 | ||
277 | /* Make socket for Linux netlink interface. */ | |
d62a17ae | 278 | static int netlink_socket(struct nlsock *nl, unsigned long groups, |
279 | ns_id_t ns_id) | |
1fdc9eae | 280 | { |
d62a17ae | 281 | int ret; |
282 | struct sockaddr_nl snl; | |
283 | int sock; | |
284 | int namelen; | |
d62a17ae | 285 | |
0cf6db21 | 286 | frr_with_privs(&zserv_privs) { |
6bb30c2c DL |
287 | sock = ns_socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE, ns_id); |
288 | if (sock < 0) { | |
289 | zlog_err("Can't open %s socket: %s", nl->name, | |
290 | safe_strerror(errno)); | |
291 | return -1; | |
292 | } | |
d62a17ae | 293 | |
0d6f7fd6 | 294 | memset(&snl, 0, sizeof(snl)); |
6bb30c2c DL |
295 | snl.nl_family = AF_NETLINK; |
296 | snl.nl_groups = groups; | |
d62a17ae | 297 | |
6bb30c2c | 298 | /* Bind the socket to the netlink structure for anything. */ |
0d6f7fd6 | 299 | ret = bind(sock, (struct sockaddr *)&snl, sizeof(snl)); |
6bb30c2c | 300 | } |
d62a17ae | 301 | |
302 | if (ret < 0) { | |
6bb30c2c DL |
303 | zlog_err("Can't bind %s socket to group 0x%x: %s", nl->name, |
304 | snl.nl_groups, safe_strerror(errno)); | |
d62a17ae | 305 | close(sock); |
306 | return -1; | |
307 | } | |
308 | ||
309 | /* multiple netlink sockets will have different nl_pid */ | |
0d6f7fd6 | 310 | namelen = sizeof(snl); |
d62a17ae | 311 | ret = getsockname(sock, (struct sockaddr *)&snl, (socklen_t *)&namelen); |
0d6f7fd6 | 312 | if (ret < 0 || namelen != sizeof(snl)) { |
450971aa | 313 | flog_err_sys(EC_LIB_SOCKET, "Can't get %s socket name: %s", |
09c866e3 | 314 | nl->name, safe_strerror(errno)); |
d62a17ae | 315 | close(sock); |
316 | return -1; | |
317 | } | |
318 | ||
319 | nl->snl = snl; | |
320 | nl->sock = sock; | |
321 | return ret; | |
1fdc9eae | 322 | } |
323 | ||
d166308b MS |
324 | /* |
325 | * Dispatch an incoming netlink message; used by the zebra main pthread's | |
326 | * netlink event reader. | |
327 | */ | |
2414abd3 | 328 | static int netlink_information_fetch(struct nlmsghdr *h, ns_id_t ns_id, |
d62a17ae | 329 | int startup) |
1fdc9eae | 330 | { |
3575d9e8 DS |
331 | /* |
332 | * When we handle new message types here | |
333 | * because we are starting to install them | |
334 | * then lets check the netlink_install_filter | |
335 | * and see if we should add the corresponding | |
336 | * allow through entry there. | |
337 | * Probably not needed to do but please | |
338 | * think about it. | |
339 | */ | |
d62a17ae | 340 | switch (h->nlmsg_type) { |
341 | case RTM_NEWROUTE: | |
2414abd3 | 342 | return netlink_route_change(h, ns_id, startup); |
d62a17ae | 343 | case RTM_DELROUTE: |
2414abd3 | 344 | return netlink_route_change(h, ns_id, startup); |
d62a17ae | 345 | case RTM_NEWLINK: |
2414abd3 | 346 | return netlink_link_change(h, ns_id, startup); |
d62a17ae | 347 | case RTM_DELLINK: |
2414abd3 | 348 | return netlink_link_change(h, ns_id, startup); |
d62a17ae | 349 | case RTM_NEWNEIGH: |
d62a17ae | 350 | case RTM_DELNEIGH: |
951f8bcb | 351 | case RTM_GETNEIGH: |
7a52f27e | 352 | return netlink_neigh_change(h, ns_id); |
942bf97b | 353 | case RTM_NEWRULE: |
2414abd3 | 354 | return netlink_rule_change(h, ns_id, startup); |
942bf97b | 355 | case RTM_DELRULE: |
2414abd3 | 356 | return netlink_rule_change(h, ns_id, startup); |
79580b5a | 357 | case RTM_NEWNEXTHOP: |
d9f5b2f5 | 358 | return netlink_nexthop_change(h, ns_id, startup); |
79580b5a | 359 | case RTM_DELNEXTHOP: |
d9f5b2f5 | 360 | return netlink_nexthop_change(h, ns_id, startup); |
d166308b MS |
361 | |
362 | /* Messages handled in the dplane thread */ | |
363 | case RTM_NEWADDR: | |
364 | case RTM_DELADDR: | |
365 | return 0; | |
366 | ||
d62a17ae | 367 | default: |
3575d9e8 DS |
368 | /* |
369 | * If we have received this message then | |
370 | * we have made a mistake during development | |
371 | * and we need to write some code to handle | |
372 | * this message type or not ask for | |
373 | * it to be sent up to us | |
374 | */ | |
e914ccbe | 375 | flog_err(EC_ZEBRA_UNKNOWN_NLMSG, |
1d5453d6 | 376 | "Unknown netlink nlmsg_type %s(%d) vrf %u", |
1c50c1c0 QY |
377 | nl_msg_type_to_str(h->nlmsg_type), h->nlmsg_type, |
378 | ns_id); | |
d62a17ae | 379 | break; |
380 | } | |
381 | return 0; | |
1fdc9eae | 382 | } |
383 | ||
d166308b MS |
384 | /* |
385 | * Dispatch an incoming netlink message; used by the dataplane pthread's | |
386 | * netlink event reader code. | |
387 | */ | |
388 | static int dplane_netlink_information_fetch(struct nlmsghdr *h, ns_id_t ns_id, | |
389 | int startup) | |
390 | { | |
391 | /* | |
392 | * Dispatch the incoming messages that the dplane pthread handles | |
393 | */ | |
394 | switch (h->nlmsg_type) { | |
395 | case RTM_NEWADDR: | |
396 | case RTM_DELADDR: | |
397 | return netlink_interface_addr_dplane(h, ns_id, startup); | |
398 | ||
399 | /* TODO */ | |
400 | case RTM_NEWLINK: | |
401 | case RTM_DELLINK: | |
402 | ||
403 | default: | |
404 | break; | |
405 | } | |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
d62a17ae | 410 | static int kernel_read(struct thread *thread) |
1fdc9eae | 411 | { |
d62a17ae | 412 | struct zebra_ns *zns = (struct zebra_ns *)THREAD_ARG(thread); |
85a75f1e MS |
413 | struct zebra_dplane_info dp_info; |
414 | ||
415 | /* Capture key info from ns struct */ | |
416 | zebra_dplane_info_from_zns(&dp_info, zns, false); | |
417 | ||
418 | netlink_parse_info(netlink_information_fetch, &zns->netlink, &dp_info, | |
9bfadae8 | 419 | 5, false); |
d166308b | 420 | |
3801e764 | 421 | thread_add_read(zrouter.master, kernel_read, zns, zns->netlink.sock, |
d62a17ae | 422 | &zns->t_netlink); |
1fdc9eae | 423 | |
d62a17ae | 424 | return 0; |
1fdc9eae | 425 | } |
426 | ||
d166308b MS |
427 | /* |
428 | * Called by the dplane pthread to read incoming OS messages and dispatch them. | |
429 | */ | |
430 | int kernel_dplane_read(struct zebra_dplane_info *info) | |
431 | { | |
432 | netlink_parse_info(dplane_netlink_information_fetch, &info->nls, info, | |
9bfadae8 | 433 | 5, false); |
d166308b MS |
434 | |
435 | return 0; | |
436 | } | |
437 | ||
3575d9e8 DS |
438 | /* |
439 | * Filter out messages from self that occur on listener socket, | |
62b8bb7a | 440 | * caused by our actions on the command socket(s) |
3575d9e8 DS |
441 | * |
442 | * When we add new Netlink message types we probably | |
443 | * do not need to add them here as that we are filtering | |
444 | * on the routes we actually care to receive( which is rarer | |
445 | * then the normal course of operations). We are intentionally | |
446 | * allowing some messages from ourselves through | |
447 | * ( I'm looking at you Interface based netlink messages ) | |
448 | * so that we only had to write one way to handle incoming | |
449 | * address add/delete changes. | |
1fdc9eae | 450 | */ |
ff45112c | 451 | static void netlink_install_filter(int sock, uint32_t pid, uint32_t dplane_pid) |
1fdc9eae | 452 | { |
3575d9e8 DS |
453 | /* |
454 | * BPF_JUMP instructions and where you jump to are based upon | |
455 | * 0 as being the next statement. So count from 0. Writing | |
456 | * this down because every time I look at this I have to | |
457 | * re-remember it. | |
458 | */ | |
d62a17ae | 459 | struct sock_filter filter[] = { |
3575d9e8 DS |
460 | /* |
461 | * Logic: | |
62b8bb7a MS |
462 | * if (nlmsg_pid == pid || |
463 | * nlmsg_pid == dplane_pid) { | |
3575d9e8 DS |
464 | * if (the incoming nlmsg_type == |
465 | * RTM_NEWADDR | RTM_DELADDR) | |
466 | * keep this message | |
467 | * else | |
468 | * skip this message | |
469 | * } else | |
470 | * keep this netlink message | |
471 | */ | |
472 | /* | |
473 | * 0: Load the nlmsg_pid into the BPF register | |
474 | */ | |
d62a17ae | 475 | BPF_STMT(BPF_LD | BPF_ABS | BPF_W, |
476 | offsetof(struct nlmsghdr, nlmsg_pid)), | |
3575d9e8 DS |
477 | /* |
478 | * 1: Compare to pid | |
479 | */ | |
62b8bb7a | 480 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htonl(pid), 1, 0), |
3575d9e8 | 481 | /* |
62b8bb7a MS |
482 | * 2: Compare to dplane pid |
483 | */ | |
484 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htonl(dplane_pid), 0, 4), | |
485 | /* | |
486 | * 3: Load the nlmsg_type into BPF register | |
3575d9e8 DS |
487 | */ |
488 | BPF_STMT(BPF_LD | BPF_ABS | BPF_H, | |
489 | offsetof(struct nlmsghdr, nlmsg_type)), | |
490 | /* | |
62b8bb7a | 491 | * 4: Compare to RTM_NEWADDR |
3575d9e8 DS |
492 | */ |
493 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htons(RTM_NEWADDR), 2, 0), | |
494 | /* | |
62b8bb7a | 495 | * 5: Compare to RTM_DELADDR |
3575d9e8 DS |
496 | */ |
497 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htons(RTM_DELADDR), 1, 0), | |
498 | /* | |
62b8bb7a | 499 | * 6: This is the end state of we want to skip the |
3575d9e8 DS |
500 | * message |
501 | */ | |
d62a17ae | 502 | BPF_STMT(BPF_RET | BPF_K, 0), |
62b8bb7a | 503 | /* 7: This is the end state of we want to keep |
3575d9e8 DS |
504 | * the message |
505 | */ | |
d62a17ae | 506 | BPF_STMT(BPF_RET | BPF_K, 0xffff), |
507 | }; | |
508 | ||
509 | struct sock_fprog prog = { | |
9d303b37 | 510 | .len = array_size(filter), .filter = filter, |
d62a17ae | 511 | }; |
512 | ||
513 | if (setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &prog, sizeof(prog)) | |
514 | < 0) | |
1d5453d6 | 515 | flog_err_sys(EC_LIB_SOCKET, "Can't install socket filter: %s", |
9df414fe | 516 | safe_strerror(errno)); |
1fdc9eae | 517 | } |
518 | ||
d166308b MS |
519 | void netlink_parse_rtattr_flags(struct rtattr **tb, int max, struct rtattr *rta, |
520 | int len, unsigned short flags) | |
4bcdb608 NA |
521 | { |
522 | unsigned short type; | |
523 | ||
269b69d7 | 524 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
4bcdb608 NA |
525 | while (RTA_OK(rta, len)) { |
526 | type = rta->rta_type & ~flags; | |
527 | if ((type <= max) && (!tb[type])) | |
528 | tb[type] = rta; | |
529 | rta = RTA_NEXT(rta, len); | |
530 | } | |
531 | } | |
532 | ||
d62a17ae | 533 | void netlink_parse_rtattr(struct rtattr **tb, int max, struct rtattr *rta, |
534 | int len) | |
1fdc9eae | 535 | { |
269b69d7 | 536 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
d62a17ae | 537 | while (RTA_OK(rta, len)) { |
538 | if (rta->rta_type <= max) | |
539 | tb[rta->rta_type] = rta; | |
540 | rta = RTA_NEXT(rta, len); | |
541 | } | |
1fdc9eae | 542 | } |
543 | ||
87da6a60 SW |
544 | /** |
545 | * netlink_parse_rtattr_nested() - Parses a nested route attribute | |
546 | * @tb: Pointer to array for storing rtattr in. | |
547 | * @max: Max number to store. | |
548 | * @rta: Pointer to rtattr to look for nested items in. | |
549 | */ | |
550 | void netlink_parse_rtattr_nested(struct rtattr **tb, int max, | |
551 | struct rtattr *rta) | |
552 | { | |
553 | netlink_parse_rtattr(tb, max, RTA_DATA(rta), RTA_PAYLOAD(rta)); | |
554 | } | |
555 | ||
312a6bee JU |
556 | bool nl_attr_put(struct nlmsghdr *n, unsigned int maxlen, int type, |
557 | const void *data, unsigned int alen) | |
1fdc9eae | 558 | { |
d62a17ae | 559 | int len; |
560 | struct rtattr *rta; | |
1fdc9eae | 561 | |
d62a17ae | 562 | len = RTA_LENGTH(alen); |
1fdc9eae | 563 | |
d62a17ae | 564 | if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) |
312a6bee | 565 | return false; |
1fdc9eae | 566 | |
d62a17ae | 567 | rta = (struct rtattr *)(((char *)n) + NLMSG_ALIGN(n->nlmsg_len)); |
568 | rta->rta_type = type; | |
569 | rta->rta_len = len; | |
4b2792b5 | 570 | |
d62a17ae | 571 | if (data) |
572 | memcpy(RTA_DATA(rta), data, alen); | |
573 | else | |
574 | assert(alen == 0); | |
4b2792b5 | 575 | |
d62a17ae | 576 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); |
1fdc9eae | 577 | |
312a6bee | 578 | return true; |
1fdc9eae | 579 | } |
580 | ||
94d70a65 DS |
581 | bool nl_attr_put8(struct nlmsghdr *n, unsigned int maxlen, int type, |
582 | uint8_t data) | |
583 | { | |
584 | return nl_attr_put(n, maxlen, type, &data, sizeof(uint8_t)); | |
585 | } | |
586 | ||
312a6bee JU |
587 | bool nl_attr_put16(struct nlmsghdr *n, unsigned int maxlen, int type, |
588 | uint16_t data) | |
bbc16902 | 589 | { |
312a6bee | 590 | return nl_attr_put(n, maxlen, type, &data, sizeof(uint16_t)); |
bbc16902 | 591 | } |
592 | ||
312a6bee JU |
593 | bool nl_attr_put32(struct nlmsghdr *n, unsigned int maxlen, int type, |
594 | uint32_t data) | |
1fdc9eae | 595 | { |
312a6bee | 596 | return nl_attr_put(n, maxlen, type, &data, sizeof(uint32_t)); |
1fdc9eae | 597 | } |
598 | ||
312a6bee | 599 | struct rtattr *nl_attr_nest(struct nlmsghdr *n, unsigned int maxlen, int type) |
1fdc9eae | 600 | { |
d62a17ae | 601 | struct rtattr *nest = NLMSG_TAIL(n); |
1fdc9eae | 602 | |
312a6bee JU |
603 | if (!nl_attr_put(n, maxlen, type, NULL, 0)) |
604 | return NULL; | |
605 | ||
40d86eba | 606 | nest->rta_type |= NLA_F_NESTED; |
d62a17ae | 607 | return nest; |
1fdc9eae | 608 | } |
609 | ||
312a6bee | 610 | int nl_attr_nest_end(struct nlmsghdr *n, struct rtattr *nest) |
1fdc9eae | 611 | { |
d7c0a89a | 612 | nest->rta_len = (uint8_t *)NLMSG_TAIL(n) - (uint8_t *)nest; |
d62a17ae | 613 | return n->nlmsg_len; |
1fdc9eae | 614 | } |
615 | ||
312a6bee | 616 | struct rtnexthop *nl_attr_rtnh(struct nlmsghdr *n, unsigned int maxlen) |
1fdc9eae | 617 | { |
312a6bee | 618 | struct rtnexthop *rtnh = (struct rtnexthop *)NLMSG_TAIL(n); |
1fdc9eae | 619 | |
312a6bee JU |
620 | if (NLMSG_ALIGN(n->nlmsg_len) + RTNH_ALIGN(sizeof(struct rtnexthop)) |
621 | > maxlen) | |
622 | return NULL; | |
623 | ||
624 | memset(rtnh, 0, sizeof(struct rtnexthop)); | |
625 | n->nlmsg_len = | |
626 | NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(sizeof(struct rtnexthop)); | |
627 | ||
628 | return rtnh; | |
1fdc9eae | 629 | } |
630 | ||
312a6bee | 631 | void nl_attr_rtnh_end(struct nlmsghdr *n, struct rtnexthop *rtnh) |
1fdc9eae | 632 | { |
312a6bee | 633 | rtnh->rtnh_len = (uint8_t *)NLMSG_TAIL(n) - (uint8_t *)rtnh; |
1fdc9eae | 634 | } |
635 | ||
d62a17ae | 636 | const char *nl_msg_type_to_str(uint16_t msg_type) |
1fdc9eae | 637 | { |
d62a17ae | 638 | return lookup_msg(nlmsg_str, msg_type, ""); |
1fdc9eae | 639 | } |
640 | ||
d7c0a89a | 641 | const char *nl_rtproto_to_str(uint8_t rtproto) |
1fdc9eae | 642 | { |
d62a17ae | 643 | return lookup_msg(rtproto_str, rtproto, ""); |
1fdc9eae | 644 | } |
b339bde7 | 645 | |
d7c0a89a | 646 | const char *nl_family_to_str(uint8_t family) |
b339bde7 | 647 | { |
d62a17ae | 648 | return lookup_msg(family_str, family, ""); |
b339bde7 DS |
649 | } |
650 | ||
d7c0a89a | 651 | const char *nl_rttype_to_str(uint8_t rttype) |
b339bde7 | 652 | { |
d62a17ae | 653 | return lookup_msg(rttype_str, rttype, ""); |
b339bde7 DS |
654 | } |
655 | ||
4cebb2b6 | 656 | #define NLA_OK(nla, len) \ |
5d307d5d DS |
657 | ((len) >= (int)sizeof(struct nlattr) \ |
658 | && (nla)->nla_len >= sizeof(struct nlattr) \ | |
659 | && (nla)->nla_len <= (len)) | |
4cebb2b6 SW |
660 | #define NLA_NEXT(nla, attrlen) \ |
661 | ((attrlen) -= NLA_ALIGN((nla)->nla_len), \ | |
662 | (struct nlattr *)(((char *)(nla)) + NLA_ALIGN((nla)->nla_len))) | |
663 | #define NLA_LENGTH(len) (NLA_ALIGN(sizeof(struct nlattr)) + (len)) | |
664 | #define NLA_DATA(nla) ((struct nlattr *)(((char *)(nla)) + NLA_LENGTH(0))) | |
665 | ||
666 | #define ERR_NLA(err, inner_len) \ | |
667 | ((struct nlattr *)(((char *)(err)) \ | |
668 | + NLMSG_ALIGN(sizeof(struct nlmsgerr)) \ | |
669 | + NLMSG_ALIGN((inner_len)))) | |
5d307d5d DS |
670 | |
671 | static void netlink_parse_nlattr(struct nlattr **tb, int max, | |
672 | struct nlattr *nla, int len) | |
673 | { | |
4cebb2b6 | 674 | while (NLA_OK(nla, len)) { |
5d307d5d DS |
675 | if (nla->nla_type <= max) |
676 | tb[nla->nla_type] = nla; | |
4cebb2b6 | 677 | nla = NLA_NEXT(nla, len); |
5d307d5d DS |
678 | } |
679 | } | |
680 | ||
681 | static void netlink_parse_extended_ack(struct nlmsghdr *h) | |
682 | { | |
4cebb2b6 SW |
683 | struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {}; |
684 | const struct nlmsgerr *err = (const struct nlmsgerr *)NLMSG_DATA(h); | |
5d307d5d | 685 | const struct nlmsghdr *err_nlh = NULL; |
4cebb2b6 SW |
686 | /* Length not including nlmsghdr */ |
687 | uint32_t len = 0; | |
688 | /* Inner error netlink message length */ | |
689 | uint32_t inner_len = 0; | |
5d307d5d DS |
690 | const char *msg = NULL; |
691 | uint32_t off = 0; | |
692 | ||
693 | if (!(h->nlmsg_flags & NLM_F_CAPPED)) | |
4cebb2b6 SW |
694 | inner_len = (uint32_t)NLMSG_PAYLOAD(&err->msg, 0); |
695 | ||
696 | len = (uint32_t)(NLMSG_PAYLOAD(h, sizeof(struct nlmsgerr)) - inner_len); | |
5d307d5d | 697 | |
4cebb2b6 SW |
698 | netlink_parse_nlattr(tb, NLMSGERR_ATTR_MAX, ERR_NLA(err, inner_len), |
699 | len); | |
5d307d5d DS |
700 | |
701 | if (tb[NLMSGERR_ATTR_MSG]) | |
4cebb2b6 | 702 | msg = (const char *)NLA_DATA(tb[NLMSGERR_ATTR_MSG]); |
5d307d5d DS |
703 | |
704 | if (tb[NLMSGERR_ATTR_OFFS]) { | |
4cebb2b6 | 705 | off = *(uint32_t *)NLA_DATA(tb[NLMSGERR_ATTR_OFFS]); |
5d307d5d DS |
706 | |
707 | if (off > h->nlmsg_len) { | |
9165c5f5 | 708 | zlog_err("Invalid offset for NLMSGERR_ATTR_OFFS"); |
5d307d5d DS |
709 | } else if (!(h->nlmsg_flags & NLM_F_CAPPED)) { |
710 | /* | |
711 | * Header of failed message | |
712 | * we are not doing anything currently with it | |
713 | * but noticing it for later. | |
714 | */ | |
715 | err_nlh = &err->msg; | |
15569c58 | 716 | zlog_debug("%s: Received %s extended Ack", __func__, |
87b5d1b0 | 717 | nl_msg_type_to_str(err_nlh->nlmsg_type)); |
5d307d5d DS |
718 | } |
719 | } | |
720 | ||
721 | if (msg && *msg != '\0') { | |
722 | bool is_err = !!err->error; | |
723 | ||
724 | if (is_err) | |
725 | zlog_err("Extended Error: %s", msg); | |
726 | else | |
e914ccbe | 727 | flog_warn(EC_ZEBRA_NETLINK_EXTENDED_WARNING, |
9df414fe | 728 | "Extended Warning: %s", msg); |
5d307d5d DS |
729 | } |
730 | } | |
731 | ||
ae6138bf JU |
732 | /* |
733 | * netlink_send_msg - send a netlink message of a certain size. | |
734 | * | |
735 | * Returns -1 on error. Otherwise, it returns the number of bytes sent. | |
736 | */ | |
f8653393 JU |
737 | static ssize_t netlink_send_msg(const struct nlsock *nl, void *buf, |
738 | size_t buflen) | |
ae6138bf | 739 | { |
f8653393 JU |
740 | struct sockaddr_nl snl = {}; |
741 | struct iovec iov = {}; | |
742 | struct msghdr msg = {}; | |
743 | ssize_t status; | |
744 | int save_errno = 0; | |
ae6138bf JU |
745 | |
746 | iov.iov_base = buf; | |
747 | iov.iov_len = buflen; | |
f8653393 | 748 | msg.msg_name = &snl; |
ae6138bf JU |
749 | msg.msg_namelen = sizeof(snl); |
750 | msg.msg_iov = &iov; | |
751 | msg.msg_iovlen = 1; | |
752 | ||
753 | snl.nl_family = AF_NETLINK; | |
754 | ||
755 | /* Send message to netlink interface. */ | |
756 | frr_with_privs(&zserv_privs) { | |
757 | status = sendmsg(nl->sock, &msg, 0); | |
758 | save_errno = errno; | |
759 | } | |
760 | ||
761 | if (IS_ZEBRA_DEBUG_KERNEL_MSGDUMP_SEND) { | |
762 | zlog_debug("%s: >> netlink message dump [sent]", __func__); | |
eead0bc4 RZ |
763 | #ifdef NETLINK_DEBUG |
764 | nl_dump(buf, buflen); | |
765 | #else | |
ae6138bf | 766 | zlog_hexdump(buf, buflen); |
eead0bc4 | 767 | #endif /* NETLINK_DEBUG */ |
ae6138bf JU |
768 | } |
769 | ||
f8653393 | 770 | if (status == -1) { |
ae6138bf JU |
771 | flog_err_sys(EC_LIB_SOCKET, "%s error: %s", __func__, |
772 | safe_strerror(save_errno)); | |
773 | return -1; | |
774 | } | |
775 | ||
776 | return status; | |
777 | } | |
778 | ||
779 | /* | |
780 | * netlink_recv_msg - receive a netlink message. | |
781 | * | |
782 | * Returns -1 on error, 0 if read would block or the number of bytes received. | |
783 | */ | |
784 | static int netlink_recv_msg(const struct nlsock *nl, struct msghdr msg, | |
785 | void *buf, size_t buflen) | |
786 | { | |
787 | struct iovec iov; | |
788 | int status; | |
789 | ||
790 | iov.iov_base = buf; | |
791 | iov.iov_len = buflen; | |
792 | msg.msg_iov = &iov; | |
793 | msg.msg_iovlen = 1; | |
794 | ||
795 | do { | |
ae6138bf | 796 | status = recvmsg(nl->sock, &msg, 0); |
f8653393 | 797 | } while (status == -1 && errno == EINTR); |
ae6138bf | 798 | |
f8653393 | 799 | if (status == -1) { |
ae6138bf JU |
800 | if (errno == EWOULDBLOCK || errno == EAGAIN) |
801 | return 0; | |
802 | flog_err(EC_ZEBRA_RECVMSG_OVERRUN, "%s recvmsg overrun: %s", | |
803 | nl->name, safe_strerror(errno)); | |
804 | /* | |
805 | * In this case we are screwed. There is no good way to recover | |
806 | * zebra at this point. | |
807 | */ | |
808 | exit(-1); | |
809 | } | |
810 | ||
811 | if (status == 0) { | |
812 | flog_err_sys(EC_LIB_SOCKET, "%s EOF", nl->name); | |
813 | return -1; | |
814 | } | |
815 | ||
816 | if (msg.msg_namelen != sizeof(struct sockaddr_nl)) { | |
817 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, | |
818 | "%s sender address length error: length %d", nl->name, | |
819 | msg.msg_namelen); | |
820 | return -1; | |
821 | } | |
822 | ||
823 | if (IS_ZEBRA_DEBUG_KERNEL_MSGDUMP_RECV) { | |
824 | zlog_debug("%s: << netlink message dump [recv]", __func__); | |
eead0bc4 RZ |
825 | #ifdef NETLINK_DEBUG |
826 | nl_dump(buf, status); | |
827 | #else | |
ae6138bf | 828 | zlog_hexdump(buf, status); |
eead0bc4 | 829 | #endif /* NETLINK_DEBUG */ |
ae6138bf JU |
830 | } |
831 | ||
ae6138bf JU |
832 | return status; |
833 | } | |
834 | ||
835 | /* | |
836 | * netlink_parse_error - parse a netlink error message | |
837 | * | |
838 | * Returns 1 if this message is acknowledgement, 0 if this error should be | |
839 | * ignored, -1 otherwise. | |
840 | */ | |
841 | static int netlink_parse_error(const struct nlsock *nl, struct nlmsghdr *h, | |
d166308b | 842 | bool is_cmd, bool startup) |
ae6138bf JU |
843 | { |
844 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); | |
845 | int errnum = err->error; | |
846 | int msg_type = err->msg.nlmsg_type; | |
847 | ||
848 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) { | |
849 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, | |
850 | "%s error: message truncated", nl->name); | |
851 | return -1; | |
852 | } | |
853 | ||
854 | /* | |
855 | * Parse the extended information before we actually handle it. At this | |
856 | * point in time we do not do anything other than report the issue. | |
857 | */ | |
858 | if (h->nlmsg_flags & NLM_F_ACK_TLVS) | |
859 | netlink_parse_extended_ack(h); | |
860 | ||
861 | /* If the error field is zero, then this is an ACK. */ | |
862 | if (err->error == 0) { | |
863 | if (IS_ZEBRA_DEBUG_KERNEL) { | |
864 | zlog_debug("%s: %s ACK: type=%s(%u), seq=%u, pid=%u", | |
865 | __func__, nl->name, | |
866 | nl_msg_type_to_str(err->msg.nlmsg_type), | |
867 | err->msg.nlmsg_type, err->msg.nlmsg_seq, | |
868 | err->msg.nlmsg_pid); | |
869 | } | |
870 | ||
871 | return 1; | |
872 | } | |
873 | ||
874 | /* Deal with errors that occur because of races in link handling. */ | |
d166308b | 875 | if (is_cmd |
ae6138bf JU |
876 | && ((msg_type == RTM_DELROUTE |
877 | && (-errnum == ENODEV || -errnum == ESRCH)) | |
878 | || (msg_type == RTM_NEWROUTE | |
879 | && (-errnum == ENETDOWN || -errnum == EEXIST)))) { | |
880 | if (IS_ZEBRA_DEBUG_KERNEL) | |
881 | zlog_debug("%s: error: %s type=%s(%u), seq=%u, pid=%u", | |
882 | nl->name, safe_strerror(-errnum), | |
883 | nl_msg_type_to_str(msg_type), msg_type, | |
884 | err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
885 | return 0; | |
886 | } | |
887 | ||
888 | /* | |
889 | * We see RTM_DELNEIGH when shutting down an interface with an IPv4 | |
890 | * link-local. The kernel should have already deleted the neighbor so | |
891 | * do not log these as an error. | |
892 | */ | |
893 | if (msg_type == RTM_DELNEIGH | |
d166308b | 894 | || (is_cmd && msg_type == RTM_NEWROUTE |
ae6138bf JU |
895 | && (-errnum == ESRCH || -errnum == ENETUNREACH))) { |
896 | /* | |
897 | * This is known to happen in some situations, don't log as | |
898 | * error. | |
899 | */ | |
900 | if (IS_ZEBRA_DEBUG_KERNEL) | |
901 | zlog_debug("%s error: %s, type=%s(%u), seq=%u, pid=%u", | |
902 | nl->name, safe_strerror(-errnum), | |
903 | nl_msg_type_to_str(msg_type), msg_type, | |
904 | err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
905 | } else { | |
906 | if ((msg_type != RTM_GETNEXTHOP) || !startup) | |
907 | flog_err(EC_ZEBRA_UNEXPECTED_MESSAGE, | |
908 | "%s error: %s, type=%s(%u), seq=%u, pid=%u", | |
909 | nl->name, safe_strerror(-errnum), | |
910 | nl_msg_type_to_str(msg_type), msg_type, | |
911 | err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
912 | } | |
913 | ||
914 | return -1; | |
915 | } | |
916 | ||
936ebf0a DS |
917 | /* |
918 | * netlink_parse_info | |
919 | * | |
920 | * Receive message from netlink interface and pass those information | |
921 | * to the given function. | |
922 | * | |
923 | * filter -> Function to call to read the results | |
924 | * nl -> netlink socket information | |
925 | * zns -> The zebra namespace data | |
926 | * count -> How many we should read in, 0 means as much as possible | |
927 | * startup -> Are we reading in under startup conditions? passed to | |
928 | * the filter. | |
929 | */ | |
2414abd3 | 930 | int netlink_parse_info(int (*filter)(struct nlmsghdr *, ns_id_t, int), |
7cdb1a84 MS |
931 | const struct nlsock *nl, |
932 | const struct zebra_dplane_info *zns, | |
9bfadae8 | 933 | int count, bool startup) |
1fdc9eae | 934 | { |
d62a17ae | 935 | int status; |
936 | int ret = 0; | |
937 | int error; | |
938 | int read_in = 0; | |
939 | ||
940 | while (1) { | |
9ed7517b | 941 | char buf[NL_RCV_PKT_BUF_SIZE]; |
d62a17ae | 942 | struct sockaddr_nl snl; |
943 | struct msghdr msg = {.msg_name = (void *)&snl, | |
ae6138bf | 944 | .msg_namelen = sizeof(snl)}; |
d62a17ae | 945 | struct nlmsghdr *h; |
946 | ||
947 | if (count && read_in >= count) | |
948 | return 0; | |
949 | ||
ae6138bf JU |
950 | status = netlink_recv_msg(nl, msg, buf, sizeof(buf)); |
951 | if (status == -1) | |
d62a17ae | 952 | return -1; |
ae6138bf JU |
953 | else if (status == 0) |
954 | break; | |
81a2f870 | 955 | |
d62a17ae | 956 | read_in++; |
957 | for (h = (struct nlmsghdr *)buf; | |
e6a0e0d1 | 958 | (status >= 0 && NLMSG_OK(h, (unsigned int)status)); |
d62a17ae | 959 | h = NLMSG_NEXT(h, status)) { |
960 | /* Finish of reading. */ | |
961 | if (h->nlmsg_type == NLMSG_DONE) | |
962 | return ret; | |
963 | ||
964 | /* Error handling. */ | |
965 | if (h->nlmsg_type == NLMSG_ERROR) { | |
d166308b MS |
966 | int err = netlink_parse_error( |
967 | nl, h, zns->is_cmd, startup); | |
968 | ||
ae6138bf | 969 | if (err == 1) { |
d62a17ae | 970 | if (!(h->nlmsg_flags & NLM_F_MULTI)) |
971 | return 0; | |
972 | continue; | |
ae6138bf JU |
973 | } else |
974 | return err; | |
d62a17ae | 975 | } |
976 | ||
977 | /* OK we got netlink message. */ | |
978 | if (IS_ZEBRA_DEBUG_KERNEL) | |
979 | zlog_debug( | |
d166308b MS |
980 | "%s: %s type %s(%u), len=%d, seq=%u, pid=%u", |
981 | __func__, nl->name, | |
d62a17ae | 982 | nl_msg_type_to_str(h->nlmsg_type), |
983 | h->nlmsg_type, h->nlmsg_len, | |
984 | h->nlmsg_seq, h->nlmsg_pid); | |
985 | ||
783827ae DS |
986 | |
987 | /* | |
988 | * Ignore messages that maybe sent from | |
989 | * other actors besides the kernel | |
990 | */ | |
991 | if (snl.nl_pid != 0) { | |
43e52561 QY |
992 | zlog_debug("Ignoring message from pid %u", |
993 | snl.nl_pid); | |
d62a17ae | 994 | continue; |
995 | } | |
996 | ||
2414abd3 | 997 | error = (*filter)(h, zns->ns_id, startup); |
d62a17ae | 998 | if (error < 0) { |
9df414fe QY |
999 | zlog_debug("%s filter function error", |
1000 | nl->name); | |
d62a17ae | 1001 | ret = error; |
1002 | } | |
1003 | } | |
1004 | ||
1005 | /* After error care. */ | |
1006 | if (msg.msg_flags & MSG_TRUNC) { | |
e914ccbe | 1007 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
1c50c1c0 | 1008 | "%s error: message truncated", nl->name); |
d62a17ae | 1009 | continue; |
1010 | } | |
1011 | if (status) { | |
e914ccbe | 1012 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
1c50c1c0 QY |
1013 | "%s error: data remnant size %d", nl->name, |
1014 | status); | |
d62a17ae | 1015 | return -1; |
1016 | } | |
1017 | } | |
1018 | return ret; | |
1fdc9eae | 1019 | } |
1020 | ||
936ebf0a | 1021 | /* |
7cdb1a84 | 1022 | * netlink_talk_info |
936ebf0a DS |
1023 | * |
1024 | * sendmsg() to netlink socket then recvmsg(). | |
1025 | * Calls netlink_parse_info to parse returned data | |
1026 | * | |
1027 | * filter -> The filter to read final results from kernel | |
1028 | * nlmsghdr -> The data to send to the kernel | |
8b962e77 | 1029 | * dp_info -> The dataplane and netlink socket information |
936ebf0a DS |
1030 | * startup -> Are we reading in under startup conditions |
1031 | * This is passed through eventually to filter. | |
1032 | */ | |
67e3369e JU |
1033 | static int |
1034 | netlink_talk_info(int (*filter)(struct nlmsghdr *, ns_id_t, int startup), | |
1035 | struct nlmsghdr *n, const struct zebra_dplane_info *dp_info, | |
9bfadae8 | 1036 | bool startup) |
1fdc9eae | 1037 | { |
7cdb1a84 | 1038 | const struct nlsock *nl; |
d62a17ae | 1039 | |
7cdb1a84 MS |
1040 | nl = &(dp_info->nls); |
1041 | n->nlmsg_seq = nl->seq; | |
d62a17ae | 1042 | n->nlmsg_pid = nl->snl.nl_pid; |
1043 | ||
d62a17ae | 1044 | if (IS_ZEBRA_DEBUG_KERNEL) |
1045 | zlog_debug( | |
1046 | "netlink_talk: %s type %s(%u), len=%d seq=%u flags 0x%x", | |
1047 | nl->name, nl_msg_type_to_str(n->nlmsg_type), | |
1048 | n->nlmsg_type, n->nlmsg_len, n->nlmsg_seq, | |
1049 | n->nlmsg_flags); | |
1050 | ||
f8653393 | 1051 | if (netlink_send_msg(nl, n, n->nlmsg_len) == -1) |
d62a17ae | 1052 | return -1; |
d62a17ae | 1053 | |
d62a17ae | 1054 | /* |
1055 | * Get reply from netlink socket. | |
1056 | * The reply should either be an acknowlegement or an error. | |
1057 | */ | |
7cdb1a84 MS |
1058 | return netlink_parse_info(filter, nl, dp_info, 0, startup); |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Synchronous version of netlink_talk_info. Converts args to suit the | |
1063 | * common version, which is suitable for both sync and async use. | |
7cdb1a84 MS |
1064 | */ |
1065 | int netlink_talk(int (*filter)(struct nlmsghdr *, ns_id_t, int startup), | |
1066 | struct nlmsghdr *n, struct nlsock *nl, struct zebra_ns *zns, | |
9bfadae8 | 1067 | bool startup) |
7cdb1a84 MS |
1068 | { |
1069 | struct zebra_dplane_info dp_info; | |
1070 | ||
1071 | /* Increment sequence number before capturing snapshot of ns socket | |
1072 | * info. | |
1073 | */ | |
1074 | nl->seq++; | |
1075 | ||
1076 | /* Capture info in intermediate info struct */ | |
85a75f1e | 1077 | zebra_dplane_info_from_zns(&dp_info, zns, (nl == &(zns->netlink_cmd))); |
7cdb1a84 | 1078 | |
5709131c | 1079 | return netlink_talk_info(filter, n, &dp_info, startup); |
1fdc9eae | 1080 | } |
1081 | ||
289602d7 | 1082 | /* Issue request message to kernel via netlink socket. GET messages |
1083 | * are issued through this interface. | |
1084 | */ | |
fd3f8e52 | 1085 | int netlink_request(struct nlsock *nl, void *req) |
1fdc9eae | 1086 | { |
fd3f8e52 | 1087 | struct nlmsghdr *n = (struct nlmsghdr *)req; |
d62a17ae | 1088 | |
1089 | /* Check netlink socket. */ | |
1090 | if (nl->sock < 0) { | |
450971aa | 1091 | flog_err_sys(EC_LIB_SOCKET, "%s socket isn't active.", |
09c866e3 | 1092 | nl->name); |
d62a17ae | 1093 | return -1; |
1094 | } | |
1095 | ||
1096 | /* Fill common fields for all requests. */ | |
d62a17ae | 1097 | n->nlmsg_pid = nl->snl.nl_pid; |
1098 | n->nlmsg_seq = ++nl->seq; | |
1099 | ||
f8653393 | 1100 | if (netlink_send_msg(nl, req, n->nlmsg_len) == -1) |
d62a17ae | 1101 | return -1; |
d62a17ae | 1102 | |
1103 | return 0; | |
1fdc9eae | 1104 | } |
1105 | ||
e63c7622 JU |
1106 | static int nl_batch_read_resp(struct nl_batch *bth) |
1107 | { | |
1108 | struct nlmsghdr *h; | |
1109 | struct sockaddr_nl snl; | |
9d06e121 | 1110 | struct msghdr msg = {}; |
f6feb48b | 1111 | int status, seq; |
e63c7622 | 1112 | const struct nlsock *nl; |
f6feb48b JU |
1113 | struct zebra_dplane_ctx *ctx; |
1114 | bool ignore_msg; | |
e63c7622 JU |
1115 | |
1116 | nl = &(bth->zns->nls); | |
1117 | ||
1118 | msg.msg_name = (void *)&snl; | |
1119 | msg.msg_namelen = sizeof(snl); | |
1120 | ||
2f9dbd3a JU |
1121 | /* |
1122 | * The responses are not batched, so we need to read and process one | |
1123 | * message at a time. | |
1124 | */ | |
1125 | while (true) { | |
1126 | status = netlink_recv_msg(nl, msg, nl_batch_rx_buf, | |
1127 | sizeof(nl_batch_rx_buf)); | |
1128 | if (status == -1 || status == 0) | |
1129 | return status; | |
e63c7622 | 1130 | |
2f9dbd3a | 1131 | h = (struct nlmsghdr *)nl_batch_rx_buf; |
f6feb48b JU |
1132 | ignore_msg = false; |
1133 | seq = h->nlmsg_seq; | |
e63c7622 | 1134 | /* |
f6feb48b JU |
1135 | * Find the corresponding context object. Received responses are |
1136 | * in the same order as requests we sent, so we can simply | |
1137 | * iterate over the context list and match responses with | |
1138 | * requests at same time. | |
e63c7622 | 1139 | */ |
f6feb48b JU |
1140 | while (true) { |
1141 | ctx = dplane_ctx_dequeue(&(bth->ctx_list)); | |
1142 | if (ctx == NULL) | |
1143 | break; | |
1144 | ||
1145 | dplane_ctx_enqueue_tail(bth->ctx_out_q, ctx); | |
1146 | ||
1147 | /* We have found corresponding context object. */ | |
1148 | if (dplane_ctx_get_ns(ctx)->nls.seq == seq) | |
e63c7622 | 1149 | break; |
f6feb48b JU |
1150 | |
1151 | /* | |
1152 | * 'update' context objects take two consecutive | |
1153 | * sequence numbers. | |
1154 | */ | |
1155 | if (dplane_ctx_is_update(ctx) | |
1156 | && dplane_ctx_get_ns(ctx)->nls.seq + 1 == seq) { | |
1157 | /* | |
1158 | * This is the situation where we get a response | |
1159 | * to a message that should be ignored. | |
1160 | */ | |
1161 | ignore_msg = true; | |
1162 | break; | |
1163 | } | |
e63c7622 JU |
1164 | } |
1165 | ||
f6feb48b JU |
1166 | if (ignore_msg) |
1167 | continue; | |
1168 | ||
e63c7622 JU |
1169 | /* |
1170 | * We received a message with the sequence number that isn't | |
1171 | * associated with any dplane context object. | |
1172 | */ | |
f6feb48b | 1173 | if (ctx == NULL) { |
4c99d413 MS |
1174 | if (IS_ZEBRA_DEBUG_KERNEL) |
1175 | zlog_debug( | |
1176 | "%s: skipping unassociated response, seq number %d NS %u", | |
1177 | __func__, h->nlmsg_seq, | |
1178 | bth->zns->ns_id); | |
e63c7622 JU |
1179 | continue; |
1180 | } | |
1181 | ||
1182 | if (h->nlmsg_type == NLMSG_ERROR) { | |
d166308b MS |
1183 | int err = netlink_parse_error(nl, h, bth->zns->is_cmd, |
1184 | false); | |
e63c7622 JU |
1185 | |
1186 | if (err == -1) | |
f6feb48b JU |
1187 | dplane_ctx_set_status( |
1188 | ctx, ZEBRA_DPLANE_REQUEST_FAILURE); | |
e63c7622 | 1189 | |
4c99d413 MS |
1190 | if (IS_ZEBRA_DEBUG_KERNEL) |
1191 | zlog_debug("%s: netlink error message seq=%d ", | |
1192 | __func__, h->nlmsg_seq); | |
e63c7622 JU |
1193 | continue; |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * If we get here then we did not receive neither the ack nor | |
1198 | * the error and instead received some other message in an | |
1199 | * unexpected way. | |
1200 | */ | |
4c99d413 MS |
1201 | if (IS_ZEBRA_DEBUG_KERNEL) |
1202 | zlog_debug("%s: ignoring message type 0x%04x(%s) NS %u", | |
1203 | __func__, h->nlmsg_type, | |
1204 | nl_msg_type_to_str(h->nlmsg_type), | |
1205 | bth->zns->ns_id); | |
e63c7622 JU |
1206 | } |
1207 | ||
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | static void nl_batch_reset(struct nl_batch *bth) | |
1212 | { | |
e63c7622 JU |
1213 | bth->buf_head = bth->buf; |
1214 | bth->curlen = 0; | |
1215 | bth->msgcnt = 0; | |
1216 | bth->zns = NULL; | |
1217 | ||
f6feb48b | 1218 | TAILQ_INIT(&(bth->ctx_list)); |
e63c7622 JU |
1219 | } |
1220 | ||
f6feb48b | 1221 | static void nl_batch_init(struct nl_batch *bth, struct dplane_ctx_q *ctx_out_q) |
e63c7622 | 1222 | { |
531c92b8 JU |
1223 | /* |
1224 | * If the size of the buffer has changed, free and then allocate a new | |
1225 | * one. | |
1226 | */ | |
1227 | size_t bufsize = | |
1228 | atomic_load_explicit(&nl_batch_bufsize, memory_order_relaxed); | |
1229 | if (bufsize != nl_batch_tx_bufsize) { | |
1230 | if (nl_batch_tx_buf) | |
1231 | XFREE(MTYPE_NL_BUF, nl_batch_tx_buf); | |
1232 | ||
1233 | nl_batch_tx_buf = XCALLOC(MTYPE_NL_BUF, bufsize); | |
1234 | nl_batch_tx_bufsize = bufsize; | |
1235 | } | |
1236 | ||
f6feb48b | 1237 | bth->buf = nl_batch_tx_buf; |
531c92b8 JU |
1238 | bth->bufsiz = bufsize; |
1239 | bth->limit = atomic_load_explicit(&nl_batch_send_threshold, | |
1240 | memory_order_relaxed); | |
e63c7622 | 1241 | |
f6feb48b | 1242 | bth->ctx_out_q = ctx_out_q; |
e63c7622 | 1243 | |
f6feb48b JU |
1244 | nl_batch_reset(bth); |
1245 | } | |
1246 | ||
1247 | static void nl_batch_send(struct nl_batch *bth) | |
1248 | { | |
1249 | struct zebra_dplane_ctx *ctx; | |
1250 | bool err = false; | |
e63c7622 | 1251 | |
f6feb48b JU |
1252 | if (bth->curlen != 0 && bth->zns != NULL) { |
1253 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1254 | zlog_debug("%s: %s, batch size=%zu, msg cnt=%zu", | |
1255 | __func__, bth->zns->nls.name, bth->curlen, | |
1256 | bth->msgcnt); | |
e63c7622 | 1257 | |
f6feb48b JU |
1258 | if (netlink_send_msg(&(bth->zns->nls), bth->buf, bth->curlen) |
1259 | == -1) | |
e63c7622 | 1260 | err = true; |
e63c7622 | 1261 | |
f6feb48b JU |
1262 | if (!err) { |
1263 | if (nl_batch_read_resp(bth) == -1) | |
1264 | err = true; | |
1265 | } | |
1266 | } | |
e63c7622 | 1267 | |
f6feb48b JU |
1268 | /* Move remaining contexts to the outbound queue. */ |
1269 | while (true) { | |
1270 | ctx = dplane_ctx_dequeue(&(bth->ctx_list)); | |
1271 | if (ctx == NULL) | |
1272 | break; | |
e63c7622 | 1273 | |
f6feb48b JU |
1274 | if (err) |
1275 | dplane_ctx_set_status(ctx, | |
1276 | ZEBRA_DPLANE_REQUEST_FAILURE); | |
e63c7622 | 1277 | |
f6feb48b | 1278 | dplane_ctx_enqueue_tail(bth->ctx_out_q, ctx); |
e63c7622 JU |
1279 | } |
1280 | ||
1281 | nl_batch_reset(bth); | |
1282 | } | |
1283 | ||
e63c7622 JU |
1284 | enum netlink_msg_status netlink_batch_add_msg( |
1285 | struct nl_batch *bth, struct zebra_dplane_ctx *ctx, | |
1286 | ssize_t (*msg_encoder)(struct zebra_dplane_ctx *, void *, size_t), | |
f6feb48b | 1287 | bool ignore_res) |
e63c7622 JU |
1288 | { |
1289 | int seq; | |
1290 | ssize_t size; | |
1291 | struct nlmsghdr *msgh; | |
1292 | ||
e63c7622 JU |
1293 | size = (*msg_encoder)(ctx, bth->buf_head, bth->bufsiz - bth->curlen); |
1294 | ||
1295 | /* | |
1296 | * If there was an error while encoding the message (other than buffer | |
1297 | * overflow) then return an error. | |
1298 | */ | |
1299 | if (size < 0) | |
1300 | return FRR_NETLINK_ERROR; | |
1301 | ||
1302 | /* | |
1303 | * If the message doesn't fit entirely in the buffer then send the batch | |
1304 | * and retry. | |
1305 | */ | |
1306 | if (size == 0) { | |
1307 | nl_batch_send(bth); | |
1308 | size = (*msg_encoder)(ctx, bth->buf_head, | |
1309 | bth->bufsiz - bth->curlen); | |
1310 | /* | |
1311 | * If the message doesn't fit in the empty buffer then just | |
1312 | * return an error. | |
1313 | */ | |
1314 | if (size <= 0) | |
1315 | return FRR_NETLINK_ERROR; | |
1316 | } | |
1317 | ||
1318 | seq = dplane_ctx_get_ns(ctx)->nls.seq; | |
f6feb48b | 1319 | if (ignore_res) |
e63c7622 JU |
1320 | seq++; |
1321 | ||
1322 | msgh = (struct nlmsghdr *)bth->buf_head; | |
1323 | msgh->nlmsg_seq = seq; | |
1324 | msgh->nlmsg_pid = dplane_ctx_get_ns(ctx)->nls.snl.nl_pid; | |
1325 | ||
e63c7622 JU |
1326 | bth->zns = dplane_ctx_get_ns(ctx); |
1327 | bth->buf_head = ((char *)bth->buf_head) + size; | |
1328 | bth->curlen += size; | |
1329 | bth->msgcnt++; | |
1330 | ||
e63c7622 JU |
1331 | return FRR_NETLINK_QUEUED; |
1332 | } | |
1333 | ||
67e3369e JU |
1334 | static enum netlink_msg_status nl_put_msg(struct nl_batch *bth, |
1335 | struct zebra_dplane_ctx *ctx) | |
1336 | { | |
1337 | if (dplane_ctx_is_skip_kernel(ctx)) | |
1338 | return FRR_NETLINK_SUCCESS; | |
1339 | ||
1340 | switch (dplane_ctx_get_op(ctx)) { | |
1341 | ||
1342 | case DPLANE_OP_ROUTE_INSTALL: | |
1343 | case DPLANE_OP_ROUTE_UPDATE: | |
1344 | case DPLANE_OP_ROUTE_DELETE: | |
1345 | return netlink_put_route_update_msg(bth, ctx); | |
1346 | ||
1347 | case DPLANE_OP_NH_INSTALL: | |
1348 | case DPLANE_OP_NH_UPDATE: | |
1349 | case DPLANE_OP_NH_DELETE: | |
1350 | return netlink_put_nexthop_update_msg(bth, ctx); | |
1351 | ||
1352 | case DPLANE_OP_LSP_INSTALL: | |
1353 | case DPLANE_OP_LSP_UPDATE: | |
1354 | case DPLANE_OP_LSP_DELETE: | |
1355 | return netlink_put_lsp_update_msg(bth, ctx); | |
1356 | ||
1357 | case DPLANE_OP_PW_INSTALL: | |
1358 | case DPLANE_OP_PW_UNINSTALL: | |
1359 | return netlink_put_pw_update_msg(bth, ctx); | |
1360 | ||
1361 | case DPLANE_OP_ADDR_INSTALL: | |
1362 | case DPLANE_OP_ADDR_UNINSTALL: | |
1363 | return netlink_put_address_update_msg(bth, ctx); | |
1364 | ||
1365 | case DPLANE_OP_MAC_INSTALL: | |
1366 | case DPLANE_OP_MAC_DELETE: | |
1367 | return netlink_put_mac_update_msg(bth, ctx); | |
1368 | ||
1369 | case DPLANE_OP_NEIGH_INSTALL: | |
1370 | case DPLANE_OP_NEIGH_UPDATE: | |
1371 | case DPLANE_OP_NEIGH_DELETE: | |
1372 | case DPLANE_OP_VTEP_ADD: | |
1373 | case DPLANE_OP_VTEP_DELETE: | |
d68e74b4 | 1374 | case DPLANE_OP_NEIGH_DISCOVER: |
0a27a2fe PG |
1375 | case DPLANE_OP_NEIGH_IP_INSTALL: |
1376 | case DPLANE_OP_NEIGH_IP_DELETE: | |
e18747a9 | 1377 | case DPLANE_OP_NEIGH_TABLE_UPDATE: |
67e3369e JU |
1378 | return netlink_put_neigh_update_msg(bth, ctx); |
1379 | ||
1380 | case DPLANE_OP_RULE_ADD: | |
1381 | case DPLANE_OP_RULE_DELETE: | |
1382 | case DPLANE_OP_RULE_UPDATE: | |
1383 | return netlink_put_rule_update_msg(bth, ctx); | |
1384 | ||
1385 | case DPLANE_OP_SYS_ROUTE_ADD: | |
1386 | case DPLANE_OP_SYS_ROUTE_DELETE: | |
1387 | case DPLANE_OP_ROUTE_NOTIFY: | |
1388 | case DPLANE_OP_LSP_NOTIFY: | |
c60522f7 | 1389 | case DPLANE_OP_BR_PORT_UPDATE: |
67e3369e JU |
1390 | return FRR_NETLINK_SUCCESS; |
1391 | ||
5162e000 PG |
1392 | case DPLANE_OP_IPTABLE_ADD: |
1393 | case DPLANE_OP_IPTABLE_DELETE: | |
ef524230 PG |
1394 | case DPLANE_OP_IPSET_ADD: |
1395 | case DPLANE_OP_IPSET_DELETE: | |
1396 | case DPLANE_OP_IPSET_ENTRY_ADD: | |
1397 | case DPLANE_OP_IPSET_ENTRY_DELETE: | |
5162e000 PG |
1398 | return FRR_NETLINK_ERROR; |
1399 | ||
62b4b7e4 PG |
1400 | case DPLANE_OP_GRE_SET: |
1401 | return netlink_put_gre_set_msg(bth, ctx); | |
1402 | ||
9d59df63 MS |
1403 | case DPLANE_OP_INTF_ADDR_ADD: |
1404 | case DPLANE_OP_INTF_ADDR_DEL: | |
67e3369e JU |
1405 | case DPLANE_OP_NONE: |
1406 | return FRR_NETLINK_ERROR; | |
1407 | } | |
1408 | ||
1409 | return FRR_NETLINK_ERROR; | |
1410 | } | |
1411 | ||
fef24b03 JU |
1412 | void kernel_update_multi(struct dplane_ctx_q *ctx_list) |
1413 | { | |
67e3369e JU |
1414 | struct nl_batch batch; |
1415 | struct zebra_dplane_ctx *ctx; | |
1416 | struct dplane_ctx_q handled_list; | |
1417 | enum netlink_msg_status res; | |
1418 | ||
67e3369e | 1419 | TAILQ_INIT(&handled_list); |
f6feb48b | 1420 | nl_batch_init(&batch, &handled_list); |
67e3369e JU |
1421 | |
1422 | while (true) { | |
1423 | ctx = dplane_ctx_dequeue(ctx_list); | |
1424 | if (ctx == NULL) | |
1425 | break; | |
1426 | ||
f6feb48b JU |
1427 | if (batch.zns != NULL |
1428 | && batch.zns->ns_id != dplane_ctx_get_ns(ctx)->ns_id) | |
1429 | nl_batch_send(&batch); | |
67e3369e JU |
1430 | |
1431 | /* | |
f6feb48b JU |
1432 | * Assume all messages will succeed and then mark only the ones |
1433 | * that failed. | |
67e3369e | 1434 | */ |
f6feb48b JU |
1435 | dplane_ctx_set_status(ctx, ZEBRA_DPLANE_REQUEST_SUCCESS); |
1436 | ||
1437 | res = nl_put_msg(&batch, ctx); | |
1438 | ||
1439 | dplane_ctx_enqueue_tail(&(batch.ctx_list), ctx); | |
1440 | if (res == FRR_NETLINK_ERROR) | |
67e3369e JU |
1441 | dplane_ctx_set_status(ctx, |
1442 | ZEBRA_DPLANE_REQUEST_FAILURE); | |
1443 | ||
f6feb48b JU |
1444 | if (batch.curlen > batch.limit) |
1445 | nl_batch_send(&batch); | |
67e3369e JU |
1446 | } |
1447 | ||
1448 | nl_batch_send(&batch); | |
1449 | ||
1450 | TAILQ_INIT(ctx_list); | |
1451 | dplane_ctx_list_append(ctx_list, &handled_list); | |
fef24b03 JU |
1452 | } |
1453 | ||
1fdc9eae | 1454 | /* Exported interface function. This function simply calls |
1455 | netlink_socket (). */ | |
d62a17ae | 1456 | void kernel_init(struct zebra_ns *zns) |
1fdc9eae | 1457 | { |
67188ca2 | 1458 | uint32_t groups; |
5d307d5d DS |
1459 | #if defined SOL_NETLINK |
1460 | int one, ret; | |
1461 | #endif | |
d62a17ae | 1462 | |
026a316f DS |
1463 | /* |
1464 | * Initialize netlink sockets | |
1465 | * | |
1466 | * If RTMGRP_XXX exists use that, but at some point | |
1467 | * I think the kernel developers realized that | |
1468 | * keeping track of all the different values would | |
1469 | * lead to confusion, so we need to convert the | |
1470 | * RTNLGRP_XXX to a bit position for ourself | |
1471 | */ | |
1472 | groups = RTMGRP_LINK | | |
1473 | RTMGRP_IPV4_ROUTE | | |
1474 | RTMGRP_IPV4_IFADDR | | |
1475 | RTMGRP_IPV6_ROUTE | | |
1476 | RTMGRP_IPV6_IFADDR | | |
1477 | RTMGRP_IPV4_MROUTE | | |
1478 | RTMGRP_NEIGH | | |
67188ca2 QY |
1479 | ((uint32_t) 1 << (RTNLGRP_IPV4_RULE - 1)) | |
1480 | ((uint32_t) 1 << (RTNLGRP_IPV6_RULE - 1)) | | |
1481 | ((uint32_t) 1 << (RTNLGRP_NEXTHOP - 1)); | |
d62a17ae | 1482 | |
1483 | snprintf(zns->netlink.name, sizeof(zns->netlink.name), | |
1484 | "netlink-listen (NS %u)", zns->ns_id); | |
1485 | zns->netlink.sock = -1; | |
19d5a4fe DS |
1486 | if (netlink_socket(&zns->netlink, groups, zns->ns_id) < 0) { |
1487 | zlog_err("Failure to create %s socket", | |
1488 | zns->netlink.name); | |
1489 | exit(-1); | |
1490 | } | |
d62a17ae | 1491 | |
1492 | snprintf(zns->netlink_cmd.name, sizeof(zns->netlink_cmd.name), | |
1493 | "netlink-cmd (NS %u)", zns->ns_id); | |
1494 | zns->netlink_cmd.sock = -1; | |
19d5a4fe DS |
1495 | if (netlink_socket(&zns->netlink_cmd, 0, zns->ns_id) < 0) { |
1496 | zlog_err("Failure to create %s socket", | |
1497 | zns->netlink_cmd.name); | |
1498 | exit(-1); | |
1499 | } | |
d62a17ae | 1500 | |
80dcc388 MS |
1501 | /* Outbound socket for dplane programming of the host OS. */ |
1502 | snprintf(zns->netlink_dplane_out.name, | |
1503 | sizeof(zns->netlink_dplane_out.name), "netlink-dp (NS %u)", | |
1504 | zns->ns_id); | |
1505 | zns->netlink_dplane_out.sock = -1; | |
1506 | if (netlink_socket(&zns->netlink_dplane_out, 0, zns->ns_id) < 0) { | |
62b8bb7a | 1507 | zlog_err("Failure to create %s socket", |
80dcc388 MS |
1508 | zns->netlink_dplane_out.name); |
1509 | exit(-1); | |
1510 | } | |
1511 | ||
1512 | /* Inbound socket for OS events coming to the dplane. */ | |
1513 | snprintf(zns->netlink_dplane_in.name, | |
1514 | sizeof(zns->netlink_dplane_in.name), "netlink-dp-in (NS %u)", | |
1515 | zns->ns_id); | |
1516 | zns->netlink_dplane_in.sock = -1; | |
1517 | if (netlink_socket(&zns->netlink_dplane_in, groups, zns->ns_id) < 0) { | |
1518 | zlog_err("Failure to create %s socket", | |
1519 | zns->netlink_dplane_in.name); | |
62b8bb7a MS |
1520 | exit(-1); |
1521 | } | |
1522 | ||
5d307d5d DS |
1523 | /* |
1524 | * SOL_NETLINK is not available on all platforms yet | |
1525 | * apparently. It's in bits/socket.h which I am not | |
1526 | * sure that we want to pull into our build system. | |
1527 | */ | |
1528 | #if defined SOL_NETLINK | |
1529 | /* | |
1530 | * Let's tell the kernel that we want to receive extended | |
62b8bb7a | 1531 | * ACKS over our command socket(s) |
5d307d5d DS |
1532 | */ |
1533 | one = 1; | |
1534 | ret = setsockopt(zns->netlink_cmd.sock, SOL_NETLINK, NETLINK_EXT_ACK, | |
1535 | &one, sizeof(one)); | |
1536 | ||
1537 | if (ret < 0) | |
62b8bb7a MS |
1538 | zlog_notice("Registration for extended cmd ACK failed : %d %s", |
1539 | errno, safe_strerror(errno)); | |
1540 | ||
1541 | one = 1; | |
80dcc388 MS |
1542 | ret = setsockopt(zns->netlink_dplane_out.sock, SOL_NETLINK, |
1543 | NETLINK_EXT_ACK, &one, sizeof(one)); | |
62b8bb7a MS |
1544 | |
1545 | if (ret < 0) | |
1546 | zlog_notice("Registration for extended dp ACK failed : %d %s", | |
5d307d5d | 1547 | errno, safe_strerror(errno)); |
97f85144 JU |
1548 | |
1549 | /* | |
1550 | * Trim off the payload of the original netlink message in the | |
1551 | * acknowledgment. This option is available since Linux 4.2, so if | |
1552 | * setsockopt fails, ignore the error. | |
1553 | */ | |
1554 | one = 1; | |
80dcc388 MS |
1555 | ret = setsockopt(zns->netlink_dplane_out.sock, SOL_NETLINK, |
1556 | NETLINK_CAP_ACK, &one, sizeof(one)); | |
9781e6a0 DS |
1557 | if (ret < 0) |
1558 | zlog_notice( | |
1559 | "Registration for reduced ACK packet size failed, probably running an early kernel"); | |
5d307d5d DS |
1560 | #endif |
1561 | ||
d62a17ae | 1562 | /* Register kernel socket. */ |
19d5a4fe | 1563 | if (fcntl(zns->netlink.sock, F_SETFL, O_NONBLOCK) < 0) |
450971aa | 1564 | flog_err_sys(EC_LIB_SOCKET, "Can't set %s socket flags: %s", |
09c866e3 | 1565 | zns->netlink.name, safe_strerror(errno)); |
8c85e8ea DS |
1566 | |
1567 | if (fcntl(zns->netlink_cmd.sock, F_SETFL, O_NONBLOCK) < 0) | |
1568 | zlog_err("Can't set %s socket error: %s(%d)", | |
1569 | zns->netlink_cmd.name, safe_strerror(errno), errno); | |
19d5a4fe | 1570 | |
80dcc388 | 1571 | if (fcntl(zns->netlink_dplane_out.sock, F_SETFL, O_NONBLOCK) < 0) |
62b8bb7a | 1572 | zlog_err("Can't set %s socket error: %s(%d)", |
80dcc388 MS |
1573 | zns->netlink_dplane_out.name, safe_strerror(errno), |
1574 | errno); | |
1575 | ||
1576 | if (fcntl(zns->netlink_dplane_in.sock, F_SETFL, O_NONBLOCK) < 0) | |
1577 | zlog_err("Can't set %s socket error: %s(%d)", | |
1578 | zns->netlink_dplane_in.name, safe_strerror(errno), | |
1579 | errno); | |
62b8bb7a | 1580 | |
19d5a4fe | 1581 | /* Set receive buffer size if it's set from command line */ |
97f85144 | 1582 | if (nl_rcvbufsize) { |
19d5a4fe | 1583 | netlink_recvbuf(&zns->netlink, nl_rcvbufsize); |
97f85144 | 1584 | netlink_recvbuf(&zns->netlink_cmd, nl_rcvbufsize); |
80dcc388 MS |
1585 | netlink_recvbuf(&zns->netlink_dplane_out, nl_rcvbufsize); |
1586 | netlink_recvbuf(&zns->netlink_dplane_in, nl_rcvbufsize); | |
97f85144 | 1587 | } |
19d5a4fe | 1588 | |
80dcc388 MS |
1589 | /* Set filter for inbound sockets, to exclude events we've generated |
1590 | * ourselves. | |
1591 | */ | |
1592 | netlink_install_filter(zns->netlink.sock, zns->netlink_cmd.snl.nl_pid, | |
1593 | zns->netlink_dplane_out.snl.nl_pid); | |
1594 | ||
1595 | netlink_install_filter(zns->netlink_dplane_in.sock, | |
62b8bb7a | 1596 | zns->netlink_cmd.snl.nl_pid, |
80dcc388 | 1597 | zns->netlink_dplane_out.snl.nl_pid); |
62b8bb7a | 1598 | |
19d5a4fe DS |
1599 | zns->t_netlink = NULL; |
1600 | ||
3801e764 | 1601 | thread_add_read(zrouter.master, kernel_read, zns, |
19d5a4fe | 1602 | zns->netlink.sock, &zns->t_netlink); |
d62a17ae | 1603 | |
1604 | rt_netlink_init(); | |
1fdc9eae | 1605 | } |
1606 | ||
62b8bb7a | 1607 | void kernel_terminate(struct zebra_ns *zns, bool complete) |
1fdc9eae | 1608 | { |
50478845 | 1609 | thread_cancel(&zns->t_netlink); |
d62a17ae | 1610 | |
1611 | if (zns->netlink.sock >= 0) { | |
1612 | close(zns->netlink.sock); | |
1613 | zns->netlink.sock = -1; | |
1614 | } | |
1615 | ||
1616 | if (zns->netlink_cmd.sock >= 0) { | |
1617 | close(zns->netlink_cmd.sock); | |
1618 | zns->netlink_cmd.sock = -1; | |
1619 | } | |
ddfeb486 | 1620 | |
80dcc388 MS |
1621 | if (zns->netlink_dplane_in.sock >= 0) { |
1622 | close(zns->netlink_dplane_in.sock); | |
1623 | zns->netlink_dplane_in.sock = -1; | |
1624 | } | |
1625 | ||
62b8bb7a MS |
1626 | /* During zebra shutdown, we need to leave the dataplane socket |
1627 | * around until all work is done. | |
1628 | */ | |
1629 | if (complete) { | |
80dcc388 MS |
1630 | if (zns->netlink_dplane_out.sock >= 0) { |
1631 | close(zns->netlink_dplane_out.sock); | |
1632 | zns->netlink_dplane_out.sock = -1; | |
62b8bb7a MS |
1633 | } |
1634 | } | |
1635 | } | |
ddfeb486 | 1636 | #endif /* HAVE_NETLINK */ |