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