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