tc/tc_filter.c

   1 /*
   2  * tc_filter.c          "tc 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 <net/if.h>
  19 #include <net/if_arp.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <arpa/inet.h>
  23 #include <string.h>
  24 #include <linux/if_ether.h>
  25
  26 #include "rt_names.h"
  27 #include "utils.h"
  28 #include "tc_util.h"
  29 #include "tc_common.h"
  30
  31 static void usage(void) __attribute__((noreturn));
  32
  33 static void usage(void)
  34 {
  35         fprintf(stderr, "Usage: tc filter [ add | del | change | get ] dev STRING\n");
  36         fprintf(stderr, "       [ pref PRIO ] [ protocol PROTO ]\n");
  37         fprintf(stderr, "       [ estimator INTERVAL TIME_CONSTANT ]\n");
  38         fprintf(stderr, "       [ root | classid CLASSID ] [ handle FILTERID ]\n");
  39         fprintf(stderr, "       [ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n");
  40         fprintf(stderr, "\n");
  41         fprintf(stderr, "       tc filter show [ dev STRING ] [ root | parent CLASSID ]\n");
  42         fprintf(stderr, "Where:\n");
  43         fprintf(stderr, "FILTER_TYPE := { rsvp | u32 | fw | route | etc. }\n");
  44         fprintf(stderr, "FILTERID := ... format depends on classifier, see there\n");
  45         fprintf(stderr, "OPTIONS := ... try tc filter add <desired FILTER_KIND> help\n");
  46         exit(-1);
  47 }
  48
  49
  50 int tc_filter_modify(int cmd, unsigned flags, int argc, char **argv)
  51 {
  52         struct rtnl_handle rth;
  53         struct {
  54                 struct nlmsghdr         n;
  55                 struct tcmsg            t;
  56                 char                    buf[MAX_MSG];
  57         } req;
  58         struct filter_util *q = NULL;
  59         __u32 prio = 0;
  60         __u32 protocol = 0;
  61         char *fhandle = NULL;
  62         char  d[16];
  63         char  k[16];
  64         struct tc_estimator est;
  65
  66         memset(&req, 0, sizeof(req));
  67         memset(&est, 0, sizeof(est));
  68         memset(d, 0, sizeof(d));
  69         memset(k, 0, sizeof(k));
  70         memset(&req, 0, sizeof(req));
  71
  72         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
  73         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
  74         req.n.nlmsg_type = cmd;
  75         req.t.tcm_family = AF_UNSPEC;
  76
  77         while (argc > 0) {
  78                 if (strcmp(*argv, "dev") == 0) {
  79                         NEXT_ARG();
  80                         if (d[0])
  81                                 duparg("dev", *argv);
  82                         strncpy(d, *argv, sizeof(d)-1);
  83                 } else if (strcmp(*argv, "root") == 0) {
  84                         if (req.t.tcm_parent) {
  85                                 fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
  86                                 exit(-1);
  87                         }
  88                         req.t.tcm_parent = TC_H_ROOT;
  89                 } else if (strcmp(*argv, "parent") == 0) {
  90                         __u32 handle;
  91                         NEXT_ARG();
  92                         if (req.t.tcm_parent)
  93                                 duparg("parent", *argv);
  94                         if (get_tc_classid(&handle, *argv))
  95                                 invarg(*argv, "Invalid parent ID");
  96                         req.t.tcm_parent = handle;
  97                 } else if (strcmp(*argv, "handle") == 0) {
  98                         NEXT_ARG();
  99                         if (fhandle)
 100                                 duparg("handle", *argv);
 101                         fhandle = *argv;
 102                 } else if (matches(*argv, "preference") == 0 ||
 103                            matches(*argv, "priority") == 0) {
 104                         NEXT_ARG();
 105                         if (prio)
 106                                 duparg("priority", *argv);
 107                         if (get_u32(&prio, *argv, 0))
 108                                 invarg(*argv, "invalid prpriority value");
 109                 } else if (matches(*argv, "protocol") == 0) {
 110                         __u16 id;
 111                         NEXT_ARG();
 112                         if (protocol)
 113                                 duparg("protocol", *argv);
 114                         if (ll_proto_a2n(&id, *argv))
 115                                 invarg(*argv, "invalid protocol");
 116                         protocol = id;
 117                 } else if (matches(*argv, "estimator") == 0) {
 118                         if (parse_estimator(&argc, &argv, &est) < 0)
 119                                 return -1;
 120                 } else if (matches(*argv, "help") == 0) {
 121                         usage();
 122                 } else {
 123                         strncpy(k, *argv, sizeof(k)-1);
 124
 125                         q = get_filter_kind(k);
 126                         argc--; argv++;
 127                         break;
 128                 }
 129
 130                 argc--; argv++;
 131         }
 132
 133         req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
 134
 135         if (k[0])
 136                 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 137
 138         if (q) {
 139                 if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
 140                         exit(1);
 141         } else {
 142                 if (fhandle) {
 143                         fprintf(stderr, "Must specify filter type when using "
 144                                 "\"handle\"\n");
 145                         exit(-1);
 146                 }
 147                 if (argc) {
 148                         if (matches(*argv, "help") == 0)
 149                                 usage();
 150                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc filter help\".\n", *argv);
 151                         exit(-1);
 152                 }
 153         }
 154         if (est.ewma_log)
 155                 addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 156
 157
 158         if (rtnl_open(&rth, 0) < 0) {
 159                 fprintf(stderr, "Cannot open rtnetlink\n");
 160                 exit(1);
 161         }
 162
 163         if (d[0])  {
 164                 ll_init_map(&rth);
 165
 166                 if ((req.t.tcm_ifindex = ll_name_to_index(d)) == 0) {
 167                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 168                         rtnl_close(&rth);
 169                         exit(1);
 170                 }
 171         }
 172
 173         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
 174                 fprintf(stderr, "We have an error talking to the kernel\n");
 175                 rtnl_close(&rth);
 176                 exit(2);
 177         }
 178
 179         rtnl_close(&rth);
 180         return 0;
 181 }
 182
 183 static __u32 filter_parent;
 184 static int filter_ifindex;
 185 static __u32 filter_prio;
 186 static __u32 filter_protocol;
 187
 188 static int print_filter(const struct sockaddr_nl *who,
 189                         struct nlmsghdr *n,
 190                         void *arg)
 191 {
 192         FILE *fp = (FILE*)arg;
 193         struct tcmsg *t = NLMSG_DATA(n);
 194         int len = n->nlmsg_len;
 195         struct rtattr * tb[TCA_MAX+1];
 196         struct filter_util *q;
 197         char abuf[256];
 198
 199         if (n->nlmsg_type != RTM_NEWTFILTER && n->nlmsg_type != RTM_DELTFILTER) {
 200                 fprintf(stderr, "Not a filter\n");
 201                 return 0;
 202         }
 203         len -= NLMSG_LENGTH(sizeof(*t));
 204         if (len < 0) {
 205                 fprintf(stderr, "Wrong len %d\n", len);
 206                 return -1;
 207         }
 208
 209         memset(tb, 0, sizeof(tb));
 210         parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
 211
 212         if (tb[TCA_KIND] == NULL) {
 213                 fprintf(stderr, "print_filter: NULL kind\n");
 214                 return -1;
 215         }
 216
 217         if (n->nlmsg_type == RTM_DELTFILTER)
 218                 fprintf(fp, "deleted ");
 219
 220         fprintf(fp, "filter ");
 221         if (!filter_ifindex || filter_ifindex != t->tcm_ifindex)
 222                 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 223
 224         if (!filter_parent || filter_parent != t->tcm_parent) {
 225                 if (t->tcm_parent == TC_H_ROOT)
 226                         fprintf(fp, "root ");
 227                 else {
 228                         print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 229                         fprintf(fp, "parent %s ", abuf);
 230                 }
 231         }
 232         if (t->tcm_info) {
 233                 __u32 protocol = TC_H_MIN(t->tcm_info);
 234                 __u32 prio = TC_H_MAJ(t->tcm_info)>>16;
 235                 if (!filter_protocol || filter_protocol != protocol) {
 236                         if (protocol) {
 237                                 SPRINT_BUF(b1);
 238                                 fprintf(fp, "protocol %s ",
 239                                         ll_proto_n2a(protocol, b1, sizeof(b1)));
 240                         }
 241                 }
 242                 if (!filter_prio || filter_prio != prio) {
 243                         if (prio)
 244                                 fprintf(fp, "pref %u ", prio);
 245                 }
 246         }
 247         fprintf(fp, "%s ", (char*)RTA_DATA(tb[TCA_KIND]));
 248         q = get_filter_kind(RTA_DATA(tb[TCA_KIND]));
 249         if (tb[TCA_OPTIONS]) {
 250                 if (q)
 251                         q->print_fopt(q, fp, tb[TCA_OPTIONS], t->tcm_handle);
 252                 else
 253                         fprintf(fp, "[cannot parse parameters]");
 254         }
 255         fprintf(fp, "\n");
 256
 257         if (show_stats && (tb[TCA_STATS] || tb[TCA_STATS2])) {
 258                 print_tcstats_attr(fp, tb, " ", NULL);
 259                 fprintf(fp, "\n");
 260         }
 261
 262         fflush(fp);
 263         return 0;
 264 }
 265
 266
 267 int tc_filter_list(int argc, char **argv)
 268 {
 269         struct tcmsg t;
 270         struct rtnl_handle rth;
 271         char d[16];
 272         __u32 prio = 0;
 273         __u32 protocol = 0;
 274         char *fhandle = NULL;
 275
 276         memset(&t, 0, sizeof(t));
 277         t.tcm_family = AF_UNSPEC;
 278         memset(d, 0, sizeof(d));
 279
 280         while (argc > 0) {
 281                 if (strcmp(*argv, "dev") == 0) {
 282                         NEXT_ARG();
 283                         if (d[0])
 284                                 duparg("dev", *argv);
 285                         strncpy(d, *argv, sizeof(d)-1);
 286                 } else if (strcmp(*argv, "root") == 0) {
 287                         if (t.tcm_parent) {
 288                                 fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
 289                                 exit(-1);
 290                         }
 291                         filter_parent = t.tcm_parent = TC_H_ROOT;
 292                 } else if (strcmp(*argv, "parent") == 0) {
 293                         __u32 handle;
 294                         NEXT_ARG();
 295                         if (t.tcm_parent)
 296                                 duparg("parent", *argv);
 297                         if (get_tc_classid(&handle, *argv))
 298                                 invarg(*argv, "invalid parent ID");
 299                         filter_parent = t.tcm_parent = handle;
 300                 } else if (strcmp(*argv, "handle") == 0) {
 301                         NEXT_ARG();
 302                         if (fhandle)
 303                                 duparg("handle", *argv);
 304                         fhandle = *argv;
 305                 } else if (matches(*argv, "preference") == 0 ||
 306                            matches(*argv, "priority") == 0) {
 307                         NEXT_ARG();
 308                         if (prio)
 309                                 duparg("priority", *argv);
 310                         if (get_u32(&prio, *argv, 0))
 311                                 invarg(*argv, "invalid preference");
 312                         filter_prio = prio;
 313                 } else if (matches(*argv, "protocol") == 0) {
 314                         __u16 res;
 315                         NEXT_ARG();
 316                         if (protocol)
 317                                 duparg("protocol", *argv);
 318                         if (ll_proto_a2n(&res, *argv))
 319                                 invarg(*argv, "invalid protocol");
 320                         protocol = res;
 321                         filter_protocol = protocol;
 322                 } else if (matches(*argv, "help") == 0) {
 323                         usage();
 324                 } else {
 325                         fprintf(stderr, " What is \"%s\"? Try \"tc filter help\"\n", *argv);
 326                         exit(-1);
 327                 }
 328
 329                 argc--; argv++;
 330         }
 331
 332         t.tcm_info = TC_H_MAKE(prio<<16, protocol);
 333
 334         if (rtnl_open(&rth, 0) < 0) {
 335                 fprintf(stderr, "Cannot open rtnetlink\n");
 336                 exit(1);
 337         }
 338
 339         ll_init_map(&rth);
 340
 341         if (d[0]) {
 342                 if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
 343                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 344                         rtnl_close(&rth);
 345                         exit(1);
 346                 }
 347                 filter_ifindex = t.tcm_ifindex;
 348         }
 349
 350         if (rtnl_dump_request(&rth, RTM_GETTFILTER, &t, sizeof(t)) < 0) {
 351                 perror("Cannot send dump request");
 352                 rtnl_close(&rth);
 353                 exit(1);
 354         }
 355
 356         if (rtnl_dump_filter(&rth, print_filter, stdout, NULL, NULL) < 0) {
 357                 fprintf(stderr, "Dump terminated\n");
 358                 exit(1);
 359         }
 360
 361         rtnl_close(&rth);
 362         return 0;
 363 }
 364
 365 int do_filter(int argc, char **argv)
 366 {
 367         if (argc < 1)
 368                 return tc_filter_list(0, NULL);
 369         if (matches(*argv, "add") == 0)
 370                 return tc_filter_modify(RTM_NEWTFILTER, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
 371         if (matches(*argv, "change") == 0)
 372                 return tc_filter_modify(RTM_NEWTFILTER, 0, argc-1, argv+1);
 373         if (matches(*argv, "replace") == 0)
 374                 return tc_filter_modify(RTM_NEWTFILTER, NLM_F_CREATE, argc-1, argv+1);
 375         if (matches(*argv, "delete") == 0)
 376                 return tc_filter_modify(RTM_DELTFILTER, 0,  argc-1, argv+1);
 377 #if 0
 378         if (matches(*argv, "get") == 0)
 379                 return tc_filter_get(RTM_GETTFILTER, 0,  argc-1, argv+1);
 380 #endif
 381         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 382             || matches(*argv, "lst") == 0)
 383                 return tc_filter_list(argc-1, argv+1);
 384         if (matches(*argv, "help") == 0)
 385                 usage();
 386         fprintf(stderr, "Command \"%s\" is unknown, try \"tc filter help\".\n", *argv);
 387         exit(-1);
 388 }
 389