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