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449a30ed SY |
1 | /* |
2 | * Zebra Traffic Control (TC) interaction with the kernel using netlink. | |
3 | * | |
4 | * Copyright (C) 2022 Shichu Yang | |
5 | * | |
daa602b5 SY |
6 | * This program 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 Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
449a30ed | 10 | * |
daa602b5 SY |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
449a30ed | 15 | * |
daa602b5 SY |
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 | |
449a30ed SY |
19 | */ |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #ifdef HAVE_NETLINK | |
24 | ||
83f496bd | 25 | #include <netinet/if_ether.h> |
449a30ed SY |
26 | #include <sys/socket.h> |
27 | ||
28 | #include "if.h" | |
29 | #include "prefix.h" | |
30 | #include "vrf.h" | |
31 | ||
32 | #include <linux/fib_rules.h> | |
33 | #include <linux/pkt_cls.h> | |
34 | #include <linux/pkt_sched.h> | |
35 | #include "zebra/zserv.h" | |
36 | #include "zebra/zebra_ns.h" | |
37 | #include "zebra/zebra_vrf.h" | |
38 | #include "zebra/rt.h" | |
39 | #include "zebra/interface.h" | |
40 | #include "zebra/debug.h" | |
41 | #include "zebra/rtadv.h" | |
42 | #include "zebra/kernel_netlink.h" | |
43 | #include "zebra/tc_netlink.h" | |
44 | #include "zebra/zebra_errors.h" | |
45 | #include "zebra/zebra_dplane.h" | |
46 | #include "zebra/zebra_trace.h" | |
47 | ||
48 | /* TODO: move these bitflags to zebra_tc.h */ | |
49 | #define TC_FILTER_SRC_IP (1 << 0) | |
50 | #define TC_FILTER_DST_IP (1 << 1) | |
51 | #define TC_FILTER_IP_PROTOCOL (1 << 9) | |
52 | ||
53 | #define TC_FREQ_DEFAULT (100) | |
54 | ||
55 | #define TC_MAJOR_BASE (0x1000u) | |
56 | #define TC_MINOR_NOCLASS (0xffffu) | |
57 | ||
58 | #define TC_FILTER_MASK (0x8000u) | |
59 | ||
60 | #define TIME_UNITS_PER_SEC (1000000) | |
61 | #define xmittime(r, s) (TIME_UNITS_PER_SEC * ((double)(s) / (double)(r))) | |
62 | ||
63 | static uint32_t tc_get_freq(void) | |
64 | { | |
65 | int freq = 0; | |
66 | FILE *fp = fopen("/proc/net/psched", "r"); | |
67 | ||
68 | if (fp) { | |
69 | uint32_t nom, denom; | |
70 | ||
71 | if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2) { | |
72 | if (nom == 1000000) | |
73 | freq = denom; | |
74 | } | |
75 | fclose(fp); | |
76 | } | |
77 | ||
78 | return freq == 0 ? TC_FREQ_DEFAULT : freq; | |
79 | } | |
80 | ||
81 | static inline uint32_t tc_make_handle(uint16_t major, uint16_t minor) | |
82 | { | |
83 | return (major) << 16 | (minor); | |
84 | } | |
85 | ||
86 | static inline uint32_t tc_get_handle(struct zebra_dplane_ctx *ctx, | |
87 | uint16_t minor) | |
88 | { | |
89 | uint16_t major = TC_MAJOR_BASE + (uint16_t)dplane_ctx_get_ifindex(ctx); | |
90 | ||
91 | return tc_make_handle(major, minor); | |
92 | } | |
93 | ||
94 | static void tc_calc_rate_table(struct tc_ratespec *ratespec, uint32_t *table, | |
95 | uint32_t mtu) | |
96 | { | |
97 | if (mtu == 0) | |
98 | mtu = 2047; | |
99 | ||
100 | int cell_log = -1; | |
101 | ||
102 | if (cell_log < 0) { | |
103 | cell_log = 0; | |
104 | while ((mtu >> cell_log) > 255) | |
105 | cell_log++; | |
106 | } | |
107 | ||
108 | for (int i = 0; i < 256; i++) | |
109 | table[i] = xmittime(ratespec->rate, (i + 1) << cell_log); | |
110 | ||
111 | ratespec->cell_align = -1; | |
112 | ratespec->cell_log = cell_log; | |
113 | ratespec->linklayer = TC_LINKLAYER_ETHERNET; | |
114 | } | |
115 | ||
116 | static int tc_flower_get_inet_prefix(const struct prefix *prefix, | |
117 | struct inet_prefix *addr) | |
118 | { | |
119 | addr->family = prefix->family; | |
120 | ||
121 | if (addr->family == AF_INET) { | |
122 | addr->bytelen = 4; | |
123 | addr->bitlen = prefix->prefixlen; | |
124 | addr->flags = 0; | |
125 | addr->flags |= PREFIXLEN_SPECIFIED; | |
126 | addr->flags |= ADDRTYPE_INET; | |
127 | memcpy(addr->data, prefix->u.val32, sizeof(prefix->u.val32)); | |
128 | } else if (addr->family == AF_INET6) { | |
129 | addr->bytelen = 16; | |
130 | addr->bitlen = prefix->prefixlen; | |
131 | addr->flags = 0; | |
132 | addr->flags |= PREFIXLEN_SPECIFIED; | |
133 | addr->flags |= ADDRTYPE_INET; | |
134 | memcpy(addr->data, prefix->u.val, sizeof(prefix->u.val)); | |
135 | } else { | |
136 | return -1; | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int tc_flower_get_inet_mask(const struct prefix *prefix, | |
143 | struct inet_prefix *addr) | |
144 | { | |
145 | addr->family = prefix->family; | |
146 | ||
147 | if (addr->family == AF_INET) { | |
148 | addr->bytelen = 4; | |
149 | addr->bitlen = prefix->prefixlen; | |
150 | addr->flags = 0; | |
151 | addr->flags |= PREFIXLEN_SPECIFIED; | |
152 | addr->flags |= ADDRTYPE_INET; | |
153 | } else if (addr->family == AF_INET6) { | |
154 | addr->bytelen = 16; | |
155 | addr->bitlen = prefix->prefixlen; | |
156 | addr->flags = 0; | |
157 | addr->flags |= PREFIXLEN_SPECIFIED; | |
158 | addr->flags |= ADDRTYPE_INET; | |
159 | } else { | |
160 | return -1; | |
161 | } | |
162 | ||
163 | memset(addr->data, 0xff, addr->bytelen); | |
164 | ||
165 | int rest = prefix->prefixlen; | |
166 | ||
167 | for (int i = 0; i < addr->bytelen / 4; i++) { | |
168 | if (!rest) { | |
169 | addr->data[i] = 0; | |
170 | } else if (rest / 32 >= 1) { | |
171 | rest -= 32; | |
172 | } else { | |
173 | addr->data[i] <<= 32 - rest; | |
174 | addr->data[i] = htonl(addr->data[i]); | |
175 | rest = 0; | |
176 | } | |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Traffic control queue discipline encoding (only "htb" supported) | |
184 | */ | |
185 | static ssize_t netlink_qdisc_msg_encode(int cmd, struct zebra_dplane_ctx *ctx, | |
186 | void *data, size_t datalen) | |
187 | { | |
188 | struct nlsock *nl; | |
189 | ||
190 | const char *kind = "htb"; | |
191 | ||
192 | struct tc_htb_glob htb_glob = { | |
193 | .rate2quantum = 10, .version = 3, .defcls = TC_MINOR_NOCLASS}; | |
194 | ||
195 | struct rtattr *nest; | |
196 | ||
197 | struct { | |
198 | struct nlmsghdr n; | |
199 | struct tcmsg t; | |
200 | char buf[0]; | |
201 | } *req = (void *)data; | |
202 | ||
203 | if (datalen < sizeof(*req)) | |
204 | return 0; | |
205 | ||
206 | nl = kernel_netlink_nlsock_lookup(dplane_ctx_get_ns_sock(ctx)); | |
207 | ||
208 | memset(req, 0, sizeof(*req)); | |
209 | ||
210 | req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)); | |
211 | req->n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
212 | ||
213 | req->n.nlmsg_flags |= NLM_F_REPLACE; | |
214 | ||
215 | req->n.nlmsg_type = cmd; | |
216 | ||
217 | req->n.nlmsg_pid = nl->snl.nl_pid; | |
218 | ||
219 | req->t.tcm_family = AF_UNSPEC; | |
220 | req->t.tcm_ifindex = dplane_ctx_get_ifindex(ctx); | |
221 | req->t.tcm_handle = tc_get_handle(ctx, 0); | |
222 | req->t.tcm_parent = TC_H_ROOT; | |
223 | ||
224 | nl_attr_put(&req->n, datalen, TCA_KIND, kind, strlen(kind) + 1); | |
225 | ||
226 | nest = nl_attr_nest(&req->n, datalen, TCA_OPTIONS); | |
227 | ||
228 | nl_attr_put(&req->n, datalen, TCA_HTB_INIT, &htb_glob, | |
229 | sizeof(htb_glob)); | |
230 | nl_attr_nest_end(&req->n, nest); | |
231 | ||
232 | return NLMSG_ALIGN(req->n.nlmsg_len); | |
233 | } | |
234 | ||
235 | /* | |
236 | * Traffic control class encoding | |
237 | */ | |
238 | static ssize_t netlink_tclass_msg_encode(int cmd, struct zebra_dplane_ctx *ctx, | |
239 | void *data, size_t datalen) | |
240 | { | |
241 | struct nlsock *nl; | |
242 | struct tc_htb_opt htb_opt = {}; | |
243 | ||
244 | uint64_t rate, ceil; | |
245 | uint64_t buffer, cbuffer; | |
246 | ||
247 | /* TODO: fetch mtu from interface */ | |
248 | uint32_t mtu = 0; | |
249 | ||
250 | uint32_t rtab[256]; | |
251 | uint32_t ctab[256]; | |
252 | ||
253 | struct rtattr *nest; | |
254 | ||
255 | struct { | |
256 | struct nlmsghdr n; | |
257 | struct tcmsg t; | |
258 | char buf[0]; | |
259 | } *req = (void *)data; | |
260 | ||
261 | if (datalen < sizeof(*req)) | |
262 | return 0; | |
263 | ||
264 | nl = kernel_netlink_nlsock_lookup(dplane_ctx_get_ns_sock(ctx)); | |
265 | ||
266 | memset(req, 0, sizeof(*req)); | |
267 | ||
268 | req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)); | |
269 | req->n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
270 | ||
271 | req->n.nlmsg_type = cmd; | |
272 | ||
273 | req->n.nlmsg_pid = nl->snl.nl_pid; | |
274 | ||
275 | req->t.tcm_family = AF_UNSPEC; | |
276 | req->t.tcm_ifindex = dplane_ctx_get_ifindex(ctx); | |
277 | req->t.tcm_handle = tc_get_handle(ctx, 1); | |
278 | req->t.tcm_parent = tc_get_handle(ctx, 0); | |
279 | ||
280 | rate = dplane_ctx_tc_get_rate(ctx); | |
281 | ceil = dplane_ctx_tc_get_ceil(ctx); | |
282 | ||
283 | ceil = ceil < rate ? rate : ceil; | |
284 | ||
285 | htb_opt.rate.rate = (rate >> 32 != 0) ? ~0U : rate; | |
286 | htb_opt.ceil.rate = (ceil >> 32 != 0) ? ~0U : ceil; | |
287 | ||
288 | buffer = rate / tc_get_freq(), cbuffer = ceil / tc_get_freq(); | |
289 | ||
290 | htb_opt.buffer = buffer; | |
291 | htb_opt.cbuffer = cbuffer; | |
292 | ||
293 | tc_calc_rate_table(&htb_opt.rate, rtab, mtu); | |
4c9b85ac | 294 | tc_calc_rate_table(&htb_opt.ceil, ctab, mtu); |
449a30ed SY |
295 | |
296 | htb_opt.ceil.mpu = htb_opt.rate.mpu = 0; | |
297 | htb_opt.ceil.overhead = htb_opt.rate.overhead = 0; | |
298 | ||
299 | nest = nl_attr_nest(&req->n, datalen, TCA_OPTIONS); | |
300 | ||
301 | if (rate >> 32 != 0) { | |
302 | nl_attr_put(&req->n, datalen, TCA_HTB_CEIL64, &rate, | |
303 | sizeof(rate)); | |
304 | } | |
305 | ||
306 | if (ceil >> 32 != 0) { | |
307 | nl_attr_put(&req->n, datalen, TCA_HTB_CEIL64, &ceil, | |
308 | sizeof(ceil)); | |
309 | } | |
310 | ||
311 | nl_attr_put(&req->n, datalen, TCA_HTB_PARMS, &htb_opt, sizeof(htb_opt)); | |
312 | ||
313 | nl_attr_put(&req->n, datalen, TCA_HTB_RTAB, rtab, sizeof(rtab)); | |
314 | nl_attr_put(&req->n, datalen, TCA_HTB_CTAB, ctab, sizeof(ctab)); | |
315 | nl_attr_nest_end(&req->n, nest); | |
316 | ||
317 | return NLMSG_ALIGN(req->n.nlmsg_len); | |
318 | } | |
319 | ||
320 | /* | |
321 | * Traffic control filter encoding (only "flower" supported) | |
322 | */ | |
323 | static ssize_t netlink_tfilter_msg_encode(int cmd, struct zebra_dplane_ctx *ctx, | |
324 | void *data, size_t datalen) | |
325 | { | |
326 | struct nlsock *nl; | |
327 | struct rtattr *nest; | |
328 | ||
329 | const char *kind = "flower"; | |
330 | ||
331 | uint16_t priority; | |
332 | uint16_t protocol; | |
333 | uint32_t classid; | |
334 | uint32_t filter_bm; | |
335 | uint32_t flags = 0; | |
336 | ||
337 | struct inet_prefix addr; | |
338 | ||
339 | struct { | |
340 | struct nlmsghdr n; | |
341 | struct tcmsg t; | |
342 | char buf[0]; | |
343 | } *req = (void *)data; | |
344 | ||
345 | if (datalen < sizeof(*req)) | |
346 | return 0; | |
347 | ||
348 | nl = kernel_netlink_nlsock_lookup(dplane_ctx_get_ns_sock(ctx)); | |
349 | ||
350 | memset(req, 0, sizeof(*req)); | |
351 | ||
352 | req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)); | |
353 | req->n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; | |
354 | ||
355 | req->n.nlmsg_flags |= NLM_F_EXCL; | |
356 | ||
357 | req->n.nlmsg_type = cmd; | |
358 | ||
359 | req->n.nlmsg_pid = nl->snl.nl_pid; | |
360 | ||
361 | req->t.tcm_family = AF_UNSPEC; | |
362 | req->t.tcm_ifindex = dplane_ctx_get_ifindex(ctx); | |
363 | ||
364 | /* TODO: priority and layer-3 protocol support */ | |
365 | priority = 0; | |
366 | protocol = htons(ETH_P_IP); | |
367 | classid = tc_get_handle(ctx, 1); | |
368 | filter_bm = dplane_ctx_tc_get_filter_bm(ctx); | |
369 | ||
370 | req->t.tcm_info = tc_make_handle(priority, protocol); | |
371 | ||
372 | req->t.tcm_handle = 1; | |
373 | req->t.tcm_parent = tc_get_handle(ctx, 0); | |
374 | ||
375 | nl_attr_put(&req->n, datalen, TCA_KIND, kind, strlen(kind) + 1); | |
376 | nest = nl_attr_nest(&req->n, datalen, TCA_OPTIONS); | |
377 | ||
378 | nl_attr_put(&req->n, datalen, TCA_FLOWER_CLASSID, &classid, | |
379 | sizeof(classid)); | |
380 | ||
381 | if (filter_bm & TC_FILTER_SRC_IP) { | |
382 | const struct prefix *src_p = dplane_ctx_tc_get_src_ip(ctx); | |
383 | ||
384 | if (tc_flower_get_inet_prefix(src_p, &addr) != 0) | |
385 | return 0; | |
386 | ||
387 | nl_attr_put(&req->n, datalen, | |
388 | (addr.family == AF_INET) ? TCA_FLOWER_KEY_IPV4_SRC | |
389 | : TCA_FLOWER_KEY_IPV6_SRC, | |
390 | addr.data, addr.bytelen); | |
391 | ||
392 | if (tc_flower_get_inet_mask(src_p, &addr) != 0) | |
393 | return 0; | |
394 | ||
395 | nl_attr_put(&req->n, datalen, | |
396 | (addr.family == AF_INET) | |
397 | ? TCA_FLOWER_KEY_IPV4_SRC_MASK | |
398 | : TCA_FLOWER_KEY_IPV6_SRC_MASK, | |
399 | addr.data, addr.bytelen); | |
400 | } | |
401 | ||
402 | if (filter_bm & TC_FILTER_DST_IP) { | |
403 | const struct prefix *dst_p = dplane_ctx_tc_get_dst_ip(ctx); | |
404 | ||
405 | if (tc_flower_get_inet_prefix(dst_p, &addr) != 0) | |
406 | return 0; | |
407 | ||
408 | nl_attr_put(&req->n, datalen, | |
409 | (addr.family == AF_INET) ? TCA_FLOWER_KEY_IPV4_DST | |
410 | : TCA_FLOWER_KEY_IPV6_DST, | |
411 | addr.data, addr.bytelen); | |
412 | ||
413 | if (tc_flower_get_inet_mask(dst_p, &addr) != 0) | |
414 | return 0; | |
415 | ||
416 | nl_attr_put(&req->n, datalen, | |
417 | (addr.family == AF_INET) | |
418 | ? TCA_FLOWER_KEY_IPV4_DST_MASK | |
419 | : TCA_FLOWER_KEY_IPV6_DST_MASK, | |
420 | addr.data, addr.bytelen); | |
421 | } | |
422 | ||
423 | if (filter_bm & TC_FILTER_IP_PROTOCOL) { | |
424 | nl_attr_put8(&req->n, datalen, TCA_FLOWER_KEY_IP_PROTO, | |
425 | dplane_ctx_tc_get_ip_proto(ctx)); | |
426 | } | |
427 | ||
428 | nl_attr_put32(&req->n, datalen, TCA_FLOWER_FLAGS, flags); | |
429 | ||
430 | nl_attr_put16(&req->n, datalen, TCA_FLOWER_KEY_ETH_TYPE, protocol); | |
431 | nl_attr_nest_end(&req->n, nest); | |
432 | ||
433 | return NLMSG_ALIGN(req->n.nlmsg_len); | |
434 | } | |
435 | ||
436 | static ssize_t netlink_newqdisc_msg_encoder(struct zebra_dplane_ctx *ctx, | |
437 | void *buf, size_t buflen) | |
438 | { | |
439 | return netlink_qdisc_msg_encode(RTM_NEWQDISC, ctx, buf, buflen); | |
440 | } | |
441 | ||
442 | static ssize_t netlink_newtclass_msg_encoder(struct zebra_dplane_ctx *ctx, | |
443 | void *buf, size_t buflen) | |
444 | { | |
445 | return netlink_tclass_msg_encode(RTM_NEWTCLASS, ctx, buf, buflen); | |
446 | } | |
447 | ||
448 | static ssize_t netlink_newtfilter_msg_encoder(struct zebra_dplane_ctx *ctx, | |
449 | void *buf, size_t buflen) | |
450 | { | |
451 | return netlink_tfilter_msg_encode(RTM_NEWTFILTER, ctx, buf, buflen); | |
452 | } | |
453 | ||
454 | enum netlink_msg_status netlink_put_tc_update_msg(struct nl_batch *bth, | |
455 | struct zebra_dplane_ctx *ctx) | |
456 | { | |
457 | /* TODO: error handling and other actions (delete, replace, ...) */ | |
458 | ||
459 | netlink_batch_add_msg(bth, ctx, netlink_newqdisc_msg_encoder, false); | |
460 | netlink_batch_add_msg(bth, ctx, netlink_newtclass_msg_encoder, false); | |
461 | return netlink_batch_add_msg(bth, ctx, netlink_newtfilter_msg_encoder, | |
462 | false); | |
463 | } | |
464 | ||
465 | #endif /* HAVE_NETLINK */ |