1 /*
2 * q_rsvp.c RSVP filter.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <unistd.h>
16 #include <syslog.h>
17 #include <fcntl.h>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
21 #include <string.h>
22
23 #include "rt_names.h"
24 #include "utils.h"
25 #include "tc_util.h"
26
explain(void)27 static void explain(void)
28 {
29 fprintf(stderr, "Usage: ... rsvp ipproto PROTOCOL session DST[/PORT | GPI ]\n");
30 fprintf(stderr, " [ sender SRC[/PORT | GPI ] ]\n");
31 fprintf(stderr, " [ classid CLASSID ] [ action ACTION_SPEC ]\n");
32 fprintf(stderr, " [ tunnelid ID ] [ tunnel ID skip NUMBER ]\n");
33 fprintf(stderr, "Where: GPI := { flowlabel NUMBER | spi/ah SPI | spi/esp SPI |\n");
34 fprintf(stderr, " u{8|16|32} NUMBER mask MASK at OFFSET}\n");
35 fprintf(stderr, " ACTION_SPEC := ... look at individual actions\n");
36 fprintf(stderr, " FILTERID := X:Y\n");
37 fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
38 }
39
get_addr_and_pi(int * argc_p,char *** argv_p,inet_prefix * addr,struct tc_rsvp_pinfo * pinfo,int dir,int family)40 static int get_addr_and_pi(int *argc_p, char ***argv_p, inet_prefix *addr,
41 struct tc_rsvp_pinfo *pinfo, int dir, int family)
42 {
43 int argc = *argc_p;
44 char **argv = *argv_p;
45 char *p = strchr(*argv, '/');
46 struct tc_rsvp_gpi *pi = dir ? &pinfo->dpi : &pinfo->spi;
47
48 if (p) {
49 __u16 tmp;
50
51 if (get_u16(&tmp, p+1, 0))
52 return -1;
53
54 if (dir == 0) {
55 /* Source port: u16 at offset 0 */
56 pi->key = htonl(((__u32)tmp)<<16);
57 pi->mask = htonl(0xFFFF0000);
58 } else {
59 /* Destination port: u16 at offset 2 */
60 pi->key = htonl(((__u32)tmp));
61 pi->mask = htonl(0x0000FFFF);
62 }
63 pi->offset = 0;
64 *p = 0;
65 }
66 if (get_addr_1(addr, *argv, family))
67 return -1;
68 if (p)
69 *p = '/';
70
71 argc--; argv++;
72
73 if (pi->mask || argc <= 0)
74 goto done;
75
76 if (strcmp(*argv, "spi/ah") == 0 ||
77 strcmp(*argv, "gpi/ah") == 0) {
78 __u32 gpi;
79
80 NEXT_ARG();
81 if (get_u32(&gpi, *argv, 0))
82 return -1;
83 pi->mask = htonl(0xFFFFFFFF);
84 pi->key = htonl(gpi);
85 pi->offset = 4;
86 if (pinfo->protocol == 0)
87 pinfo->protocol = IPPROTO_AH;
88 argc--; argv++;
89 } else if (strcmp(*argv, "spi/esp") == 0 ||
90 strcmp(*argv, "gpi/esp") == 0) {
91 __u32 gpi;
92
93 NEXT_ARG();
94 if (get_u32(&gpi, *argv, 0))
95 return -1;
96 pi->mask = htonl(0xFFFFFFFF);
97 pi->key = htonl(gpi);
98 pi->offset = 0;
99 if (pinfo->protocol == 0)
100 pinfo->protocol = IPPROTO_ESP;
101 argc--; argv++;
102 } else if (strcmp(*argv, "flowlabel") == 0) {
103 __u32 flabel;
104
105 NEXT_ARG();
106 if (get_u32(&flabel, *argv, 0))
107 return -1;
108 if (family != AF_INET6)
109 return -1;
110 pi->mask = htonl(0x000FFFFF);
111 pi->key = htonl(flabel) & pi->mask;
112 pi->offset = -40;
113 argc--; argv++;
114 } else if (strcmp(*argv, "u32") == 0 ||
115 strcmp(*argv, "u16") == 0 ||
116 strcmp(*argv, "u8") == 0) {
117 int sz = 1;
118 __u32 tmp;
119 __u32 mask = 0xff;
120
121 if (strcmp(*argv, "u32") == 0) {
122 sz = 4;
123 mask = 0xffff;
124 } else if (strcmp(*argv, "u16") == 0) {
125 mask = 0xffffffff;
126 sz = 2;
127 }
128 NEXT_ARG();
129 if (get_u32(&tmp, *argv, 0))
130 return -1;
131 argc--; argv++;
132 if (strcmp(*argv, "mask") == 0) {
133 NEXT_ARG();
134 if (get_u32(&mask, *argv, 16))
135 return -1;
136 argc--; argv++;
137 }
138 if (strcmp(*argv, "at") == 0) {
139 NEXT_ARG();
140 if (get_integer(&pi->offset, *argv, 0))
141 return -1;
142 argc--; argv++;
143 }
144 if (sz == 1) {
145 if ((pi->offset & 3) == 0) {
146 mask <<= 24;
147 tmp <<= 24;
148 } else if ((pi->offset & 3) == 1) {
149 mask <<= 16;
150 tmp <<= 16;
151 } else if ((pi->offset & 3) == 3) {
152 mask <<= 8;
153 tmp <<= 8;
154 }
155 } else if (sz == 2) {
156 if ((pi->offset & 3) == 0) {
157 mask <<= 16;
158 tmp <<= 16;
159 }
160 }
161 pi->offset &= ~3;
162 pi->mask = htonl(mask);
163 pi->key = htonl(tmp) & pi->mask;
164 }
165
166 done:
167 *argc_p = argc;
168 *argv_p = argv;
169 return 0;
170 }
171
172
rsvp_parse_opt(struct filter_util * qu,char * handle,int argc,char ** argv,struct nlmsghdr * n)173 static int rsvp_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
174 {
175 int family = strcmp(qu->id, "rsvp") == 0 ? AF_INET : AF_INET6;
176 struct tc_rsvp_pinfo pinfo = {};
177 struct tcmsg *t = NLMSG_DATA(n);
178 int pinfo_ok = 0;
179 struct rtattr *tail;
180
181 if (handle) {
182 if (get_u32(&t->tcm_handle, handle, 0)) {
183 fprintf(stderr, "Illegal \"handle\"\n");
184 return -1;
185 }
186 }
187
188 if (argc == 0)
189 return 0;
190
191 tail = NLMSG_TAIL(n);
192 addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
193
194 while (argc > 0) {
195 if (matches(*argv, "session") == 0) {
196 inet_prefix addr;
197
198 NEXT_ARG();
199 if (get_addr_and_pi(&argc, &argv, &addr, &pinfo, 1, family)) {
200 fprintf(stderr, "Illegal \"session\"\n");
201 return -1;
202 }
203 addattr_l(n, 4096, TCA_RSVP_DST, &addr.data, addr.bytelen);
204 if (pinfo.dpi.mask || pinfo.protocol)
205 pinfo_ok++;
206 continue;
207 } else if (matches(*argv, "sender") == 0 ||
208 matches(*argv, "flowspec") == 0) {
209 inet_prefix addr;
210
211 NEXT_ARG();
212 if (get_addr_and_pi(&argc, &argv, &addr, &pinfo, 0, family)) {
213 fprintf(stderr, "Illegal \"sender\"\n");
214 return -1;
215 }
216 addattr_l(n, 4096, TCA_RSVP_SRC, &addr.data, addr.bytelen);
217 if (pinfo.spi.mask || pinfo.protocol)
218 pinfo_ok++;
219 continue;
220 } else if (matches("ipproto", *argv) == 0) {
221 int num;
222
223 NEXT_ARG();
224 num = inet_proto_a2n(*argv);
225 if (num < 0) {
226 fprintf(stderr, "Illegal \"ipproto\"\n");
227 return -1;
228 }
229 pinfo.protocol = num;
230 pinfo_ok++;
231 } else if (matches(*argv, "classid") == 0 ||
232 strcmp(*argv, "flowid") == 0) {
233 unsigned int handle;
234
235 NEXT_ARG();
236 if (get_tc_classid(&handle, *argv)) {
237 fprintf(stderr, "Illegal \"classid\"\n");
238 return -1;
239 }
240 addattr_l(n, 4096, TCA_RSVP_CLASSID, &handle, 4);
241 } else if (strcmp(*argv, "tunnelid") == 0) {
242 unsigned int tid;
243
244 NEXT_ARG();
245 if (get_unsigned(&tid, *argv, 0)) {
246 fprintf(stderr, "Illegal \"tunnelid\"\n");
247 return -1;
248 }
249 pinfo.tunnelid = tid;
250 pinfo_ok++;
251 } else if (strcmp(*argv, "tunnel") == 0) {
252 unsigned int tid;
253
254 NEXT_ARG();
255 if (get_unsigned(&tid, *argv, 0)) {
256 fprintf(stderr, "Illegal \"tunnel\"\n");
257 return -1;
258 }
259 addattr_l(n, 4096, TCA_RSVP_CLASSID, &tid, 4);
260 NEXT_ARG();
261 if (strcmp(*argv, "skip") == 0) {
262 NEXT_ARG();
263 }
264 if (get_unsigned(&tid, *argv, 0)) {
265 fprintf(stderr, "Illegal \"skip\"\n");
266 return -1;
267 }
268 pinfo.tunnelhdr = tid;
269 pinfo_ok++;
270 } else if (matches(*argv, "action") == 0) {
271 NEXT_ARG();
272 if (parse_action(&argc, &argv, TCA_RSVP_ACT, n)) {
273 fprintf(stderr, "Illegal \"action\"\n");
274 return -1;
275 }
276 continue;
277 } else if (matches(*argv, "police") == 0) {
278 NEXT_ARG();
279 if (parse_police(&argc, &argv, TCA_RSVP_POLICE, n)) {
280 fprintf(stderr, "Illegal \"police\"\n");
281 return -1;
282 }
283 continue;
284 } else if (strcmp(*argv, "help") == 0) {
285 explain();
286 return -1;
287 } else {
288 fprintf(stderr, "What is \"%s\"?\n", *argv);
289 explain();
290 return -1;
291 }
292 argc--; argv++;
293 }
294
295 if (pinfo_ok)
296 addattr_l(n, 4096, TCA_RSVP_PINFO, &pinfo, sizeof(pinfo));
297 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
298 return 0;
299 }
300
sprint_spi(struct tc_rsvp_gpi * pi,int dir,char * buf)301 static char *sprint_spi(struct tc_rsvp_gpi *pi, int dir, char *buf)
302 {
303 if (pi->offset == 0) {
304 if (dir && pi->mask == htonl(0xFFFF)) {
305 snprintf(buf, SPRINT_BSIZE-1, "/%d", htonl(pi->key));
306 return buf;
307 }
308 if (!dir && pi->mask == htonl(0xFFFF0000)) {
309 snprintf(buf, SPRINT_BSIZE-1, "/%d", htonl(pi->key)>>16);
310 return buf;
311 }
312 if (pi->mask == htonl(0xFFFFFFFF)) {
313 snprintf(buf, SPRINT_BSIZE-1, " spi/esp 0x%08x", htonl(pi->key));
314 return buf;
315 }
316 } else if (pi->offset == 4 && pi->mask == htonl(0xFFFFFFFF)) {
317 snprintf(buf, SPRINT_BSIZE-1, " spi/ah 0x%08x", htonl(pi->key));
318 return buf;
319 } else if (pi->offset == -40 && pi->mask == htonl(0x000FFFFF)) {
320 snprintf(buf, SPRINT_BSIZE-1, " flowlabel 0x%05x", htonl(pi->key));
321 return buf;
322 }
323 snprintf(buf, SPRINT_BSIZE-1, " u32 0x%08x mask %08x at %d",
324 htonl(pi->key), htonl(pi->mask), pi->offset);
325 return buf;
326 }
327
rsvp_print_opt(struct filter_util * qu,FILE * f,struct rtattr * opt,__u32 handle)328 static int rsvp_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
329 {
330 int family = strcmp(qu->id, "rsvp") == 0 ? AF_INET : AF_INET6;
331 struct rtattr *tb[TCA_RSVP_MAX+1];
332 struct tc_rsvp_pinfo *pinfo = NULL;
333
334 if (opt == NULL)
335 return 0;
336
337 parse_rtattr_nested(tb, TCA_RSVP_MAX, opt);
338
339 if (handle)
340 fprintf(f, "fh 0x%08x ", handle);
341
342 if (tb[TCA_RSVP_PINFO]) {
343 if (RTA_PAYLOAD(tb[TCA_RSVP_PINFO]) < sizeof(*pinfo))
344 return -1;
345
346 pinfo = RTA_DATA(tb[TCA_RSVP_PINFO]);
347 }
348
349 if (tb[TCA_RSVP_CLASSID]) {
350 SPRINT_BUF(b1);
351 if (!pinfo || pinfo->tunnelhdr == 0)
352 fprintf(f, "flowid %s ", sprint_tc_classid(rta_getattr_u32(tb[TCA_RSVP_CLASSID]), b1));
353 else
354 fprintf(f, "tunnel %d skip %d ", rta_getattr_u32(tb[TCA_RSVP_CLASSID]), pinfo->tunnelhdr);
355 } else if (pinfo && pinfo->tunnelhdr)
356 fprintf(f, "tunnel [BAD] skip %d ", pinfo->tunnelhdr);
357
358 if (tb[TCA_RSVP_DST]) {
359 char buf[128];
360
361 fprintf(f, "session ");
362 if (inet_ntop(family, RTA_DATA(tb[TCA_RSVP_DST]), buf, sizeof(buf)) == 0)
363 fprintf(f, " [INVALID DADDR] ");
364 else
365 fprintf(f, "%s", buf);
366 if (pinfo && pinfo->dpi.mask) {
367 SPRINT_BUF(b2);
368 fprintf(f, "%s ", sprint_spi(&pinfo->dpi, 1, b2));
369 } else
370 fprintf(f, " ");
371 } else {
372 if (pinfo && pinfo->dpi.mask) {
373 SPRINT_BUF(b2);
374 fprintf(f, "session [NONE]%s ", sprint_spi(&pinfo->dpi, 1, b2));
375 } else
376 fprintf(f, "session NONE ");
377 }
378
379 if (pinfo && pinfo->protocol) {
380 SPRINT_BUF(b1);
381 fprintf(f, "ipproto %s ", inet_proto_n2a(pinfo->protocol, b1, sizeof(b1)));
382 }
383 if (pinfo && pinfo->tunnelid)
384 fprintf(f, "tunnelid %d ", pinfo->tunnelid);
385 if (tb[TCA_RSVP_SRC]) {
386 char buf[128];
387
388 fprintf(f, "sender ");
389 if (inet_ntop(family, RTA_DATA(tb[TCA_RSVP_SRC]), buf, sizeof(buf)) == 0) {
390 fprintf(f, "[BAD]");
391 } else {
392 fprintf(f, " %s", buf);
393 }
394 if (pinfo && pinfo->spi.mask) {
395 SPRINT_BUF(b2);
396 fprintf(f, "%s ", sprint_spi(&pinfo->spi, 0, b2));
397 } else
398 fprintf(f, " ");
399 } else if (pinfo && pinfo->spi.mask) {
400 SPRINT_BUF(b2);
401 fprintf(f, "sender [NONE]%s ", sprint_spi(&pinfo->spi, 0, b2));
402 }
403
404 if (tb[TCA_RSVP_ACT]) {
405 tc_print_action(f, tb[TCA_RSVP_ACT], 0);
406 }
407 if (tb[TCA_RSVP_POLICE])
408 tc_print_police(f, tb[TCA_RSVP_POLICE]);
409 return 0;
410 }
411
412 struct filter_util rsvp_filter_util = {
413 .id = "rsvp",
414 .parse_fopt = rsvp_parse_opt,
415 .print_fopt = rsvp_print_opt,
416 };
417
418 struct filter_util rsvp6_filter_util = {
419 .id = "rsvp6",
420 .parse_fopt = rsvp_parse_opt,
421 .print_fopt = rsvp_print_opt,
422 };
423