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         memset(d, 0, sizeof(d)-1);
  77         memset(&p, 0, sizeof(struct tc_mirred));
  78
  79         while (argc > 0) {
  80
  81                 if (matches(*argv, "action") == 0) {
  82                         break;
  83                 } else if (matches(*argv, "egress") == 0) {
  84                         NEXT_ARG();
  85                         ok++;
  86                         continue;
  87                 } else {
  88
  89                         if (matches(*argv, "index") == 0) {
  90                                 NEXT_ARG();
  91                                 if (get_u32(&p.index, *argv, 10)) {
  92                                         fprintf(stderr, "Illegal \"index\"\n");
  93                                         return -1;
  94                                 }
  95                                 iok++;
  96                                 if (!ok) {
  97                                         argc--;
  98                                         argv++;
  99                                         break;
 100                                 }
 101                         } else if (!ok) {
 102                                 fprintf(stderr, "was expecting egress (%s)\n", *argv);
 103                                 break;
 104
 105                         } else if (!mirror && matches(*argv, "mirror") == 0) {
 106                                 mirror = 1;
 107                                 if (redir) {
 108                                         fprintf(stderr, "Can't have both mirror and redir\n");
 109                                         return -1;
 110                                 }
 111                                 p.eaction = TCA_EGRESS_MIRROR;
 112                                 p.action = TC_ACT_PIPE;
 113                                 ok++;
 114                         } else if (!redir && matches(*argv, "redirect") == 0) {
 115                                 redir = 1;
 116                                 if (mirror) {
 117                                         fprintf(stderr, "Can't have both mirror and redir\n");
 118                                         return -1;
 119                                 }
 120                                 p.eaction = TCA_EGRESS_REDIR;
 121                                 p.action = TC_ACT_STOLEN;
 122                                 ok++;
 123                         } else if ((redir || mirror) && matches(*argv, "dev") == 0) {
 124                                 NEXT_ARG();
 125                                 if (strlen(d))
 126                                         duparg("dev", *argv);
 127
 128                                 strncpy(d, *argv, sizeof(d)-1);
 129                                 argc--;
 130                                 argv++;
 131
 132                                 break;
 133
 134                         }
 135                 }
 136
 137                 NEXT_ARG();
 138         }
 139
 140         if (!ok && !iok) {
 141                 return -1;
 142         }
 143
 144
 145
 146         if (d[0])  {
 147                 int idx;
 148
 149                 ll_init_map(&rth);
 150
 151                 if ((idx = ll_name_to_index(d)) == 0) {
 152                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 153                         return -1;
 154                 }
 155
 156                 p.ifindex = idx;
 157         }
 158
 159
 160         if (argc && p.eaction == TCA_EGRESS_MIRROR) {
 161
 162                 if (matches(*argv, "reclassify") == 0) {
 163                         p.action = TC_POLICE_RECLASSIFY;
 164                         NEXT_ARG();
 165                 } else if (matches(*argv, "pipe") == 0) {
 166                         p.action = TC_POLICE_PIPE;
 167                         NEXT_ARG();
 168                 } else if (matches(*argv, "drop") == 0 ||
 169                            matches(*argv, "shot") == 0) {
 170                         p.action = TC_POLICE_SHOT;
 171                         NEXT_ARG();
 172                 } else if (matches(*argv, "continue") == 0) {
 173                         p.action = TC_POLICE_UNSPEC;
 174                         NEXT_ARG();
 175                 } else if (matches(*argv, "pass") == 0) {
 176                         p.action = TC_POLICE_OK;
 177                         NEXT_ARG();
 178                 }
 179
 180         }
 181
 182         if (argc) {
 183                 if (iok && matches(*argv, "index") == 0) {
 184                         fprintf(stderr, "mirred: Illegal double index\n");
 185                         return -1;
 186                 } else {
 187                         if (matches(*argv, "index") == 0) {
 188                                 NEXT_ARG();
 189                                 if (get_u32(&p.index, *argv, 10)) {
 190                                         fprintf(stderr, "mirred: Illegal \"index\"\n");
 191                                         return -1;
 192                                 }
 193                                 argc--;
 194                                 argv++;
 195                         }
 196                 }
 197         }
 198
 199         tail = NLMSG_TAIL(n);
 200         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 201         addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof(p));
 202         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 203
 204         *argc_p = argc;
 205         *argv_p = argv;
 206         return 0;
 207 }
 208
 209
 210 static int
 211 parse_mirred(struct action_util *a, int *argc_p, char ***argv_p,
 212              int tca_id, struct nlmsghdr *n)
 213 {
 214
 215         int argc = *argc_p;
 216         char **argv = *argv_p;
 217
 218         if (argc < 0) {
 219                 fprintf(stderr, "mirred bad argument count %d\n", argc);
 220                 return -1;
 221         }
 222
 223         if (matches(*argv, "mirred") == 0) {
 224                 NEXT_ARG();
 225         } else {
 226                 fprintf(stderr, "mirred bad argument %s\n", *argv);
 227                 return -1;
 228         }
 229
 230
 231         if (matches(*argv, "egress") == 0 || matches(*argv, "index") == 0) {
 232                 int ret = parse_egress(a, &argc, &argv, tca_id, n);
 233
 234                 if (ret == 0) {
 235                         *argc_p = argc;
 236                         *argv_p = argv;
 237                         return 0;
 238                 }
 239
 240         } else if (matches(*argv, "ingress") == 0) {
 241                 fprintf(stderr, "mirred ingress not supported at the moment\n");
 242         } else if (matches(*argv, "help") == 0) {
 243                 usage();
 244         } else {
 245                 fprintf(stderr, "mirred option not supported %s\n", *argv);
 246         }
 247
 248         return -1;
 249
 250 }
 251
 252 static int
 253 print_mirred(struct action_util *au, FILE * f, struct rtattr *arg)
 254 {
 255         struct tc_mirred *p;
 256         struct rtattr *tb[TCA_MIRRED_MAX + 1];
 257         const char *dev;
 258
 259         SPRINT_BUF(b1);
 260
 261         if (arg == NULL)
 262                 return -1;
 263
 264         parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
 265
 266         if (tb[TCA_MIRRED_PARMS] == NULL) {
 267                 fprintf(f, "[NULL mirred parameters]");
 268                 return -1;
 269         }
 270         p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
 271
 272         /*
 273         ll_init_map(&rth);
 274         */
 275
 276
 277         if ((dev = ll_index_to_name(p->ifindex)) == 0) {
 278                 fprintf(stderr, "Cannot find device %d\n", p->ifindex);
 279                 return -1;
 280         }
 281
 282         fprintf(f, "mirred (%s to device %s) %s", mirred_n2a(p->eaction), dev, action_n2a(p->action, b1, sizeof (b1)));
 283
 284         fprintf(f, "\n ");
 285         fprintf(f, "\tindex %d ref %d bind %d", p->index, p->refcnt, p->bindcnt);
 286
 287         if (show_stats) {
 288                 if (tb[TCA_MIRRED_TM]) {
 289                         struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
 290
 291                         print_tm(f, tm);
 292                 }
 293         }
 294         fprintf(f, "\n ");
 295         return 0;
 296 }
 297
 298 struct action_util mirred_action_util = {
 299         .id = "mirred",
 300         .parse_aopt = parse_mirred,
 301         .print_aopt = print_mirred,
 302 };