tc/m_mirred.c

   1 /*
   2  * m_egress.c           ingress/egress packet mirror/redir actions module
   3  *
   4  *              This program is free software; you can distribute 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:  J Hadi Salim (hadi@cyberus.ca)
  10  *
  11  * TODO: Add Ingress support
  12  *
  13  */
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <syslog.h>
  19 #include <fcntl.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <arpa/inet.h>
  23 #include <string.h>
  24 #include "utils.h"
  25 #include "tc_util.h"
  26 #include "tc_common.h"
  27 #include <linux/tc_act/tc_mirred.h>
  28
  29 static void
  30 explain(void)
  31 {
  32         fprintf(stderr, "Usage: mirred <DIRECTION> <ACTION> [index INDEX] <dev DEVICENAME>\n");
  33         fprintf(stderr, "where:\n");
  34         fprintf(stderr, "\tDIRECTION := <ingress | egress>\n");
  35         fprintf(stderr, "\tACTION := <mirror | redirect>\n");
  36         fprintf(stderr, "\tINDEX  is the specific policy instance id\n");
  37         fprintf(stderr, "\tDEVICENAME is the devicename\n");
  38
  39 }
  40
  41 static void
  42 usage(void)
  43 {
  44         explain();
  45         exit(-1);
  46 }
  47
  48 static const char *mirred_n2a(int action)
  49 {
  50         switch (action) {
  51         case TCA_EGRESS_REDIR:
  52                 return "Egress Redirect";
  53         case TCA_INGRESS_REDIR:
  54                 return "Ingress Redirect";
  55         case TCA_EGRESS_MIRROR:
  56                 return "Egress Mirror";
  57         case TCA_INGRESS_MIRROR:
  58                 return "Ingress Mirror";
  59         default:
  60                 return "unknown";
  61         }
  62 }
  63
  64 static int
  65 parse_egress(struct action_util *a, int *argc_p, char ***argv_p,
  66              int tca_id, struct nlmsghdr *n)
  67 {
  68
  69         int argc = *argc_p;
  70         char **argv = *argv_p;
  71         int ok = 0, iok = 0, mirror = 0, redir = 0;
  72         struct tc_mirred p = {};
  73         struct rtattr *tail;
  74         char d[16] = {};
  75
  76         while (argc > 0) {
  77
  78                 if (matches(*argv, "action") == 0) {
  79                         break;
  80                 } else if (matches(*argv, "egress") == 0) {
  81                         NEXT_ARG();
  82                         ok++;
  83                         continue;
  84                 } else {
  85
  86                         if (matches(*argv, "index") == 0) {
  87                                 NEXT_ARG();
  88                                 if (get_u32(&p.index, *argv, 10)) {
  89                                         fprintf(stderr, "Illegal \"index\"\n");
  90                                         return -1;
  91                                 }
  92                                 iok++;
  93                                 if (!ok) {
  94                                         argc--;
  95                                         argv++;
  96                                         break;
  97                                 }
  98                         } else if (!ok) {
  99                                 fprintf(stderr, "was expecting egress (%s)\n", *argv);
 100                                 break;
 101
 102                         } else if (!mirror && matches(*argv, "mirror") == 0) {
 103                                 mirror = 1;
 104                                 if (redir) {
 105                                         fprintf(stderr, "Can't have both mirror and redir\n");
 106                                         return -1;
 107                                 }
 108                                 p.eaction = TCA_EGRESS_MIRROR;
 109                                 p.action = TC_ACT_PIPE;
 110                                 ok++;
 111                         } else if (!redir && matches(*argv, "redirect") == 0) {
 112                                 redir = 1;
 113                                 if (mirror) {
 114                                         fprintf(stderr, "Can't have both mirror and redir\n");
 115                                         return -1;
 116                                 }
 117                                 p.eaction = TCA_EGRESS_REDIR;
 118                                 p.action = TC_ACT_STOLEN;
 119                                 ok++;
 120                         } else if ((redir || mirror) && matches(*argv, "dev") == 0) {
 121                                 NEXT_ARG();
 122                                 if (strlen(d))
 123                                         duparg("dev", *argv);
 124
 125                                 strncpy(d, *argv, sizeof(d)-1);
 126                                 argc--;
 127                                 argv++;
 128
 129                                 break;
 130
 131                         }
 132                 }
 133
 134                 NEXT_ARG();
 135         }
 136
 137         if (!ok && !iok) {
 138                 return -1;
 139         }
 140
 141
 142
 143         if (d[0])  {
 144                 int idx;
 145
 146                 ll_init_map(&rth);
 147
 148                 if ((idx = ll_name_to_index(d)) == 0) {
 149                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 150                         return -1;
 151                 }
 152
 153                 p.ifindex = idx;
 154         }
 155
 156
 157         if (argc && p.eaction == TCA_EGRESS_MIRROR
 158             && !action_a2n(*argv, &p.action, false))
 159                 NEXT_ARG();
 160
 161         if (argc) {
 162                 if (iok && matches(*argv, "index") == 0) {
 163                         fprintf(stderr, "mirred: Illegal double index\n");
 164                         return -1;
 165                 } else {
 166                         if (matches(*argv, "index") == 0) {
 167                                 NEXT_ARG();
 168                                 if (get_u32(&p.index, *argv, 10)) {
 169                                         fprintf(stderr, "mirred: Illegal \"index\"\n");
 170                                         return -1;
 171                                 }
 172                                 argc--;
 173                                 argv++;
 174                         }
 175                 }
 176         }
 177
 178         tail = NLMSG_TAIL(n);
 179         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 180         addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof(p));
 181         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 182
 183         *argc_p = argc;
 184         *argv_p = argv;
 185         return 0;
 186 }
 187
 188
 189 static int
 190 parse_mirred(struct action_util *a, int *argc_p, char ***argv_p,
 191              int tca_id, struct nlmsghdr *n)
 192 {
 193
 194         int argc = *argc_p;
 195         char **argv = *argv_p;
 196
 197         if (argc < 0) {
 198                 fprintf(stderr, "mirred bad argument count %d\n", argc);
 199                 return -1;
 200         }
 201
 202         if (matches(*argv, "mirred") == 0) {
 203                 NEXT_ARG();
 204         } else {
 205                 fprintf(stderr, "mirred bad argument %s\n", *argv);
 206                 return -1;
 207         }
 208
 209
 210         if (matches(*argv, "egress") == 0 || matches(*argv, "index") == 0) {
 211                 int ret = parse_egress(a, &argc, &argv, tca_id, n);
 212
 213                 if (ret == 0) {
 214                         *argc_p = argc;
 215                         *argv_p = argv;
 216                         return 0;
 217                 }
 218
 219         } else if (matches(*argv, "ingress") == 0) {
 220                 fprintf(stderr, "mirred ingress not supported at the moment\n");
 221         } else if (matches(*argv, "help") == 0) {
 222                 usage();
 223         } else {
 224                 fprintf(stderr, "mirred option not supported %s\n", *argv);
 225         }
 226
 227         return -1;
 228
 229 }
 230
 231 static int
 232 print_mirred(struct action_util *au, FILE * f, struct rtattr *arg)
 233 {
 234         struct tc_mirred *p;
 235         struct rtattr *tb[TCA_MIRRED_MAX + 1];
 236         const char *dev;
 237
 238         SPRINT_BUF(b1);
 239
 240         if (arg == NULL)
 241                 return -1;
 242
 243         parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
 244
 245         if (tb[TCA_MIRRED_PARMS] == NULL) {
 246                 fprintf(f, "[NULL mirred parameters]");
 247                 return -1;
 248         }
 249         p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
 250
 251         /*
 252         ll_init_map(&rth);
 253         */
 254
 255
 256         if ((dev = ll_index_to_name(p->ifindex)) == 0) {
 257                 fprintf(stderr, "Cannot find device %d\n", p->ifindex);
 258                 return -1;
 259         }
 260
 261         fprintf(f, "mirred (%s to device %s) %s", mirred_n2a(p->eaction), dev, action_n2a(p->action, b1, sizeof (b1)));
 262
 263         fprintf(f, "\n ");
 264         fprintf(f, "\tindex %d ref %d bind %d", p->index, p->refcnt, p->bindcnt);
 265
 266         if (show_stats) {
 267                 if (tb[TCA_MIRRED_TM]) {
 268                         struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
 269
 270                         print_tm(f, tm);
 271                 }
 272         }
 273         fprintf(f, "\n ");
 274         return 0;
 275 }
 276
 277 struct action_util mirred_action_util = {
 278         .id = "mirred",
 279         .parse_aopt = parse_mirred,
 280         .print_aopt = print_mirred,
 281 };