tc/f_rsvp.c

   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
  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 ] [ police POLICE_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, "       POLICE_SPEC := ... look at TBF\n");
  36         fprintf(stderr, "       FILTERID := X:Y\n");
  37 }
  38
  39 #define usage() return(-1)
  40
  41 int get_addr_and_pi(int *argc_p, char ***argv_p, inet_prefix * addr,
  42                     struct tc_rsvp_pinfo *pinfo, int dir, int family)
  43 {
  44         int argc = *argc_p;
  45         char **argv = *argv_p;
  46         char *p = strchr(*argv, '/');
  47         struct tc_rsvp_gpi *pi = dir ? &pinfo->dpi : &pinfo->spi;
  48
  49         if (p) {
  50                 __u16 tmp;
  51
  52                 if (get_u16(&tmp, p+1, 0))
  53                         return -1;
  54
  55                 if (dir == 0) {
  56                         /* Source port: u16 at offset 0 */
  57                         pi->key = htonl(((__u32)tmp)<<16);
  58                         pi->mask = htonl(0xFFFF0000);
  59                 } else {
  60                         /* Destination port: u16 at offset 2 */
  61                         pi->key = htonl(((__u32)tmp));
  62                         pi->mask = htonl(0x0000FFFF);
  63                 }
  64                 pi->offset = 0;
  65                 *p = 0;
  66         }
  67         if (get_addr_1(addr, *argv, family))
  68                 return -1;
  69         if (p)
  70                 *p = '/';
  71
  72         argc--; argv++;
  73
  74         if (pi->mask || argc <= 0)
  75                 goto done;
  76
  77         if (strcmp(*argv, "spi/ah") == 0 ||
  78             strcmp(*argv, "gpi/ah") == 0) {
  79                 __u32 gpi;
  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                 NEXT_ARG();
  93                 if (get_u32(&gpi, *argv, 0))
  94                         return -1;
  95                 pi->mask = htonl(0xFFFFFFFF);
  96                 pi->key = htonl(gpi);
  97                 pi->offset = 0;
  98                 if (pinfo->protocol == 0)
  99                         pinfo->protocol = IPPROTO_ESP;
 100                 argc--; argv++;
 101         } else if (strcmp(*argv, "flowlabel") == 0) {
 102                 __u32 flabel;
 103                 NEXT_ARG();
 104                 if (get_u32(&flabel, *argv, 0))
 105                         return -1;
 106                 if (family != AF_INET6)
 107                         return -1;
 108                 pi->mask = htonl(0x000FFFFF);
 109                 pi->key = htonl(flabel) & pi->mask;
 110                 pi->offset = -40;
 111                 argc--; argv++;
 112         } else if (strcmp(*argv, "u32") == 0 ||
 113                    strcmp(*argv, "u16") == 0 ||
 114                    strcmp(*argv, "u8") == 0) {
 115                 int sz = 1;
 116                 __u32 tmp;
 117                 __u32 mask = 0xff;
 118                 if (strcmp(*argv, "u32") == 0) {
 119                         sz = 4;
 120                         mask = 0xffff;
 121                 } else if (strcmp(*argv, "u16") == 0) {
 122                         mask = 0xffffffff;
 123                         sz = 2;
 124                 }
 125                 NEXT_ARG();
 126                 if (get_u32(&tmp, *argv, 0))
 127                         return -1;
 128                 argc--; argv++;
 129                 if (strcmp(*argv, "mask") == 0) {
 130                         NEXT_ARG();
 131                         if (get_u32(&mask, *argv, 16))
 132                                 return -1;
 133                         argc--; argv++;
 134                 }
 135                 if (strcmp(*argv, "at") == 0) {
 136                         NEXT_ARG();
 137                         if (get_integer(&pi->offset, *argv, 0))
 138                                 return -1;
 139                         argc--; argv++;
 140                 }
 141                 if (sz == 1) {
 142                         if ((pi->offset & 3) == 0) {
 143                                 mask <<= 24;
 144                                 tmp <<= 24;
 145                         } else if ((pi->offset & 3) == 1) {
 146                                 mask <<= 16;
 147                                 tmp <<= 16;
 148                         } else if ((pi->offset & 3) == 3) {
 149                                 mask <<= 8;
 150                                 tmp <<= 8;
 151                         }
 152                 } else if (sz == 2) {
 153                         if ((pi->offset & 3) == 0) {
 154                                 mask <<= 16;
 155                                 tmp <<= 16;
 156                         }
 157                 }
 158                 pi->offset &= ~3;
 159                 pi->mask = htonl(mask);
 160                 pi->key = htonl(tmp) & pi->mask;
 161         }
 162
 163 done:
 164         *argc_p = argc;
 165         *argv_p = argv;
 166         return 0;
 167 }
 168
 169
 170 static int rsvp_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
 171 {
 172         int family = strcmp(qu->id, "rsvp") == 0 ? AF_INET : AF_INET6;
 173         struct tc_rsvp_pinfo pinfo;
 174         struct tc_police tp;
 175         struct tcmsg *t = NLMSG_DATA(n);
 176         int pinfo_ok = 0;
 177         struct rtattr *tail;
 178
 179         memset(&pinfo, 0, sizeof(pinfo));
 180         memset(&tp, 0, sizeof(tp));
 181
 182         if (handle) {
 183                 if (get_u32(&t->tcm_handle, handle, 0)) {
 184                         fprintf(stderr, "Illegal \"handle\"\n");
 185                         return -1;
 186                 }
 187         }
 188
 189         if (argc == 0)
 190                 return 0;
 191
 192         tail = NLMSG_TAIL(n);
 193         addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
 194
 195         while (argc > 0) {
 196                 if (matches(*argv, "session") == 0) {
 197                         inet_prefix addr;
 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                         NEXT_ARG();
 211                         if (get_addr_and_pi(&argc, &argv, &addr, &pinfo, 0, family)) {
 212                                 fprintf(stderr, "Illegal \"sender\"\n");
 213                                 return -1;
 214                         }
 215                         addattr_l(n, 4096, TCA_RSVP_SRC, &addr.data, addr.bytelen);
 216                         if (pinfo.spi.mask || pinfo.protocol)
 217                                 pinfo_ok++;
 218                         continue;
 219                 } else if (matches("ipproto", *argv) == 0) {
 220                         int num;
 221                         NEXT_ARG();
 222                         num = inet_proto_a2n(*argv);
 223                         if (num < 0) {
 224                                 fprintf(stderr, "Illegal \"ipproto\"\n");
 225                                 return -1;
 226                         }
 227                         pinfo.protocol = num;
 228                         pinfo_ok++;
 229                 } else if (matches(*argv, "classid") == 0 ||
 230                            strcmp(*argv, "flowid") == 0) {
 231                         unsigned handle;
 232                         NEXT_ARG();
 233                         if (get_tc_classid(&handle, *argv)) {
 234                                 fprintf(stderr, "Illegal \"classid\"\n");
 235                                 return -1;
 236                         }
 237                         addattr_l(n, 4096, TCA_RSVP_CLASSID, &handle, 4);
 238                 } else if (strcmp(*argv, "tunnelid") == 0) {
 239                         unsigned tid;
 240                         NEXT_ARG();
 241                         if (get_unsigned(&tid, *argv, 0)) {
 242                                 fprintf(stderr, "Illegal \"tunnelid\"\n");
 243                                 return -1;
 244                         }
 245                         pinfo.tunnelid = tid;
 246                         pinfo_ok++;
 247                 } else if (strcmp(*argv, "tunnel") == 0) {
 248                         unsigned tid;
 249                         NEXT_ARG();
 250                         if (get_unsigned(&tid, *argv, 0)) {
 251                                 fprintf(stderr, "Illegal \"tunnel\"\n");
 252                                 return -1;
 253                         }
 254                         addattr_l(n, 4096, TCA_RSVP_CLASSID, &tid, 4);
 255                         NEXT_ARG();
 256                         if (strcmp(*argv, "skip") == 0) {
 257                                 NEXT_ARG();
 258                         }
 259                         if (get_unsigned(&tid, *argv, 0)) {
 260                                 fprintf(stderr, "Illegal \"skip\"\n");
 261                                 return -1;
 262                         }
 263                         pinfo.tunnelhdr = tid;
 264                         pinfo_ok++;
 265                 } else if (matches(*argv, "police") == 0) {
 266                         NEXT_ARG();
 267                         if (parse_police(&argc, &argv, TCA_RSVP_POLICE, n)) {
 268                                 fprintf(stderr, "Illegal \"police\"\n");
 269                                 return -1;
 270                         }
 271                         continue;
 272                 } else if (strcmp(*argv, "help") == 0) {
 273                         explain();
 274                         return -1;
 275                 } else {
 276                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 277                         explain();
 278                         return -1;
 279                 }
 280                 argc--; argv++;
 281         }
 282
 283         if (pinfo_ok)
 284                 addattr_l(n, 4096, TCA_RSVP_PINFO, &pinfo, sizeof(pinfo));
 285         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 286         return 0;
 287 }
 288
 289 static char * sprint_spi(struct tc_rsvp_gpi *pi, int dir, char *buf)
 290 {
 291         if (pi->offset == 0) {
 292                 if (dir && pi->mask == htonl(0xFFFF)) {
 293                         snprintf(buf, SPRINT_BSIZE-1, "/%d", htonl(pi->key));
 294                         return buf;
 295                 }
 296                 if (!dir && pi->mask == htonl(0xFFFF0000)) {
 297                         snprintf(buf, SPRINT_BSIZE-1, "/%d", htonl(pi->key)>>16);
 298                         return buf;
 299                 }
 300                 if (pi->mask == htonl(0xFFFFFFFF)) {
 301                         snprintf(buf, SPRINT_BSIZE-1, " spi/esp 0x%08x", htonl(pi->key));
 302                         return buf;
 303                 }
 304         } else if (pi->offset == 4 && pi->mask == htonl(0xFFFFFFFF)) {
 305                 snprintf(buf, SPRINT_BSIZE-1, " spi/ah 0x%08x", htonl(pi->key));
 306                 return buf;
 307         } else if (pi->offset == -40 && pi->mask == htonl(0x000FFFFF)) {
 308                 snprintf(buf, SPRINT_BSIZE-1, " flowlabel 0x%05x", htonl(pi->key));
 309                 return buf;
 310         }
 311         snprintf(buf, SPRINT_BSIZE-1, " u32 0x%08x mask %08x at %d",
 312                  htonl(pi->key), htonl(pi->mask), pi->offset);
 313         return buf;
 314 }
 315
 316 static int rsvp_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
 317 {
 318         int family = strcmp(qu->id, "rsvp") == 0 ? AF_INET : AF_INET6;
 319         struct rtattr *tb[TCA_RSVP_MAX+1];
 320         struct tc_rsvp_pinfo *pinfo = NULL;
 321
 322         if (opt == NULL)
 323                 return 0;
 324
 325         parse_rtattr_nested(tb, TCA_RSVP_MAX, opt);
 326
 327         if (handle)
 328                 fprintf(f, "fh 0x%08x ", handle);
 329
 330         if (tb[TCA_RSVP_PINFO]) {
 331                 if (RTA_PAYLOAD(tb[TCA_RSVP_PINFO])  < sizeof(*pinfo))
 332                         return -1;
 333
 334                 pinfo = RTA_DATA(tb[TCA_RSVP_PINFO]);
 335         }
 336
 337         if (tb[TCA_RSVP_CLASSID]) {
 338                 SPRINT_BUF(b1);
 339                 if (!pinfo || pinfo->tunnelhdr == 0)
 340                         fprintf(f, "flowid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_RSVP_CLASSID]), b1));
 341                 else
 342                         fprintf(f, "tunnel %d skip %d ", *(__u32*)RTA_DATA(tb[TCA_RSVP_CLASSID]), pinfo->tunnelhdr);
 343         } else if (pinfo && pinfo->tunnelhdr)
 344                 fprintf(f, "tunnel [BAD] skip %d ", pinfo->tunnelhdr);
 345
 346         if (tb[TCA_RSVP_DST]) {
 347                 char buf[128];
 348                 fprintf(f, "session ");
 349                 if (inet_ntop(family, RTA_DATA(tb[TCA_RSVP_DST]), buf, sizeof(buf)) == 0)
 350                         fprintf(f, " [INVALID DADDR] ");
 351                 else
 352                         fprintf(f, "%s", buf);
 353                 if (pinfo && pinfo->dpi.mask) {
 354                         SPRINT_BUF(b2);
 355                         fprintf(f, "%s ", sprint_spi(&pinfo->dpi, 1, b2));
 356                 } else
 357                         fprintf(f, " ");
 358         } else {
 359                 if (pinfo && pinfo->dpi.mask) {
 360                         SPRINT_BUF(b2);
 361                         fprintf(f, "session [NONE]%s ", sprint_spi(&pinfo->dpi, 1, b2));
 362                 } else
 363                         fprintf(f, "session NONE ");
 364         }
 365
 366         if (pinfo && pinfo->protocol) {
 367                 SPRINT_BUF(b1);
 368                 fprintf(f, "ipproto %s ", inet_proto_n2a(pinfo->protocol, b1, sizeof(b1)));
 369         }
 370         if (pinfo && pinfo->tunnelid)
 371                 fprintf(f, "tunnelid %d ", pinfo->tunnelid);
 372         if (tb[TCA_RSVP_SRC]) {
 373                 char buf[128];
 374                 fprintf(f, "sender ");
 375                 if (inet_ntop(family, RTA_DATA(tb[TCA_RSVP_SRC]), buf, sizeof(buf)) == 0) {
 376                         fprintf(f, "[BAD]");
 377                 } else {
 378                         fprintf(f, " %s", buf);
 379                 }
 380                 if (pinfo && pinfo->spi.mask) {
 381                         SPRINT_BUF(b2);
 382                         fprintf(f, "%s ", sprint_spi(&pinfo->spi, 0, b2));
 383                 } else
 384                         fprintf(f, " ");
 385         } else if (pinfo && pinfo->spi.mask) {
 386                 SPRINT_BUF(b2);
 387                 fprintf(f, "sender [NONE]%s ", sprint_spi(&pinfo->spi, 0, b2));
 388         }
 389         if (tb[TCA_RSVP_POLICE])
 390                 tc_print_police(f, tb[TCA_RSVP_POLICE]);
 391         return 0;
 392 }
 393
 394 struct filter_util rsvp_filter_util = {
 395         .id = "rsvp",
 396         .parse_fopt = rsvp_parse_opt,
 397         .print_fopt = rsvp_print_opt,
 398 };
 399
 400 struct filter_util rsvp6_filter_util = {
 401         .id = "rsvp6",
 402         .parse_fopt = rsvp_parse_opt,
 403         .print_fopt = rsvp_print_opt,
 404 };