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
 159                 if (matches(*argv, "reclassify") == 0) {
 160                         p.action = TC_POLICE_RECLASSIFY;
 161                         NEXT_ARG();
 162                 } else if (matches(*argv, "pipe") == 0) {
 163                         p.action = TC_POLICE_PIPE;
 164                         NEXT_ARG();
 165                 } else if (matches(*argv, "drop") == 0 ||
 166                            matches(*argv, "shot") == 0) {
 167                         p.action = TC_POLICE_SHOT;
 168                         NEXT_ARG();
 169                 } else if (matches(*argv, "continue") == 0) {
 170                         p.action = TC_POLICE_UNSPEC;
 171                         NEXT_ARG();
 172                 } else if (matches(*argv, "pass") == 0 ||
 173                            matches(*argv, "ok") == 0) {
 174                         p.action = TC_POLICE_OK;
 175                         NEXT_ARG();
 176                 }
 177
 178         }
 179
 180         if (argc) {
 181                 if (iok && matches(*argv, "index") == 0) {
 182                         fprintf(stderr, "mirred: Illegal double index\n");
 183                         return -1;
 184                 } else {
 185                         if (matches(*argv, "index") == 0) {
 186                                 NEXT_ARG();
 187                                 if (get_u32(&p.index, *argv, 10)) {
 188                                         fprintf(stderr, "mirred: Illegal \"index\"\n");
 189                                         return -1;
 190                                 }
 191                                 argc--;
 192                                 argv++;
 193                         }
 194                 }
 195         }
 196
 197         tail = NLMSG_TAIL(n);
 198         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 199         addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof(p));
 200         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 201
 202         *argc_p = argc;
 203         *argv_p = argv;
 204         return 0;
 205 }
 206
 207
 208 static int
 209 parse_mirred(struct action_util *a, int *argc_p, char ***argv_p,
 210              int tca_id, struct nlmsghdr *n)
 211 {
 212
 213         int argc = *argc_p;
 214         char **argv = *argv_p;
 215
 216         if (argc < 0) {
 217                 fprintf(stderr, "mirred bad argument count %d\n", argc);
 218                 return -1;
 219         }
 220
 221         if (matches(*argv, "mirred") == 0) {
 222                 NEXT_ARG();
 223         } else {
 224                 fprintf(stderr, "mirred bad argument %s\n", *argv);
 225                 return -1;
 226         }
 227
 228
 229         if (matches(*argv, "egress") == 0 || matches(*argv, "index") == 0) {
 230                 int ret = parse_egress(a, &argc, &argv, tca_id, n);
 231
 232                 if (ret == 0) {
 233                         *argc_p = argc;
 234                         *argv_p = argv;
 235                         return 0;
 236                 }
 237
 238         } else if (matches(*argv, "ingress") == 0) {
 239                 fprintf(stderr, "mirred ingress not supported at the moment\n");
 240         } else if (matches(*argv, "help") == 0) {
 241                 usage();
 242         } else {
 243                 fprintf(stderr, "mirred option not supported %s\n", *argv);
 244         }
 245
 246         return -1;
 247
 248 }
 249
 250 static int
 251 print_mirred(struct action_util *au, FILE * f, struct rtattr *arg)
 252 {
 253         struct tc_mirred *p;
 254         struct rtattr *tb[TCA_MIRRED_MAX + 1];
 255         const char *dev;
 256
 257         SPRINT_BUF(b1);
 258
 259         if (arg == NULL)
 260                 return -1;
 261
 262         parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
 263
 264         if (tb[TCA_MIRRED_PARMS] == NULL) {
 265                 fprintf(f, "[NULL mirred parameters]");
 266                 return -1;
 267         }
 268         p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
 269
 270         /*
 271         ll_init_map(&rth);
 272         */
 273
 274
 275         if ((dev = ll_index_to_name(p->ifindex)) == 0) {
 276                 fprintf(stderr, "Cannot find device %d\n", p->ifindex);
 277                 return -1;
 278         }
 279
 280         fprintf(f, "mirred (%s to device %s) %s", mirred_n2a(p->eaction), dev, action_n2a(p->action, b1, sizeof (b1)));
 281
 282         fprintf(f, "\n ");
 283         fprintf(f, "\tindex %d ref %d bind %d", p->index, p->refcnt, p->bindcnt);
 284
 285         if (show_stats) {
 286                 if (tb[TCA_MIRRED_TM]) {
 287                         struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
 288
 289                         print_tm(f, tm);
 290                 }
 291         }
 292         fprintf(f, "\n ");
 293         return 0;
 294 }
 295
 296 struct action_util mirred_action_util = {
 297         .id = "mirred",
 298         .parse_aopt = parse_mirred,
 299         .print_aopt = print_mirred,
 300 };