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 int mirred_d = 1;
  30
  31 static void
  32 explain(void)
  33 {
  34         fprintf(stderr, "Usage: mirred <DIRECTION> <ACTION> [index INDEX] <dev DEVICENAME> \n");
  35         fprintf(stderr, "where: \n");
  36         fprintf(stderr, "DIRECTION := <ingress | egress>\n");
  37         fprintf(stderr, "aCTION := <mirror | redirect>\n");
  38         fprintf(stderr, "     : INDEX  is the specific policy instance id\n");
  39         fprintf(stderr, "     : DEVICENAME is the devicename \n");
  40 }
  41
  42 #define usage() return(-1)
  43
  44 char *mirred_n2a(int action)
  45 {
  46         switch (action) {
  47         case TCA_EGRESS_REDIR:
  48                 return "Egress Redirect";
  49         case TCA_INGRESS_REDIR:
  50                 return "Ingress Redirect";
  51         case TCA_EGRESS_MIRROR:
  52                 return "Egress Mirror";
  53         case TCA_INGRESS_MIRROR:
  54                 return "Ingress Mirror";
  55         default:
  56                 return "unknown";
  57         }
  58 }
  59
  60 int
  61 parse_egress(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
  62 {
  63
  64         int argc = *argc_p;
  65         char **argv = *argv_p;
  66         int ok = 0, iok = 0, mirror=0,redir=0;
  67         struct tc_mirred p;
  68         struct rtattr *tail;
  69         char d[16];
  70
  71         memset(d,0,sizeof(d)-1);
  72         memset(&p,0,sizeof(struct tc_mirred));
  73
  74         while (argc > 0) {
  75
  76                 if (matches(*argv, "action") == 0) {
  77                         break;
  78                 } else if (matches(*argv, "egress") == 0) {
  79                         NEXT_ARG();
  80                         ok++;
  81                         continue;
  82                 } else {
  83
  84                         if (matches(*argv, "index") == 0) {
  85                                 NEXT_ARG();
  86                                 if (get_u32(&p.index, *argv, 10)) {
  87                                         fprintf(stderr, "Illegal \"index\"\n");
  88                                         return -1;
  89                                 }
  90                                 iok++;
  91                                 if (!ok) {
  92                                         argc--;
  93                                         argv++;
  94                                         break;
  95                                 }
  96                         } else if(!ok) {
  97                                 fprintf(stderr, "was expecting egress (%s)\n", *argv);
  98                                 break;
  99
 100                         } else if (!mirror && matches(*argv, "mirror") == 0) {
 101                                 mirror=1;
 102                                 if (redir) {
 103                                         fprintf(stderr, "Cant have both mirror and redir\n");
 104                                         return -1;
 105                                 }
 106                                 p.eaction = TCA_EGRESS_MIRROR;
 107                                 p.action = TC_ACT_PIPE;
 108                                 ok++;
 109                         } else if (!redir && matches(*argv, "redirect") == 0) {
 110                                 redir=1;
 111                                 if (mirror) {
 112                                         fprintf(stderr, "Cant have both mirror and redir\n");
 113                                         return -1;
 114                                 }
 115                                 p.eaction = TCA_EGRESS_REDIR;
 116                                 p.action = TC_ACT_STOLEN;
 117                                 ok++;
 118                         } else if ((redir || mirror) && matches(*argv, "dev") == 0) {
 119                                 NEXT_ARG();
 120                                 if (strlen(d))
 121                                         duparg("dev", *argv);
 122
 123                                 strncpy(d, *argv, sizeof(d)-1);
 124                                 argc--;
 125                                 argv++;
 126
 127                                 break;
 128
 129                         }
 130                 }
 131
 132                 NEXT_ARG();
 133         }
 134
 135         if (!ok && !iok) {
 136                 explain();
 137                 return -1;
 138         }
 139
 140
 141
 142         if (d[0])  {
 143                 int idx;
 144                 ll_init_map(&rth);
 145
 146                 if ((idx = ll_name_to_index(d)) == 0) {
 147                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 148                         return -1;
 149                 }
 150
 151                 p.ifindex = idx;
 152         }
 153
 154
 155         if (argc && p.eaction == TCA_EGRESS_MIRROR) {
 156
 157                 if (matches(*argv, "reclassify") == 0) {
 158                         p.action = TC_POLICE_RECLASSIFY;
 159                         NEXT_ARG();
 160                 } else if (matches(*argv, "pipe") == 0) {
 161                         p.action = TC_POLICE_PIPE;
 162                         NEXT_ARG();
 163                 } else if (matches(*argv, "drop") == 0 ||
 164                            matches(*argv, "shot") == 0) {
 165                         p.action = TC_POLICE_SHOT;
 166                         NEXT_ARG();
 167                 } else if (matches(*argv, "continue") == 0) {
 168                         p.action = TC_POLICE_UNSPEC;
 169                         NEXT_ARG();
 170                 } else if (matches(*argv, "pass") == 0) {
 171                         p.action = TC_POLICE_OK;
 172                         NEXT_ARG();
 173                 }
 174
 175         }
 176
 177         if (argc) {
 178                 if (iok && matches(*argv, "index") == 0) {
 179                         fprintf(stderr, "mirred: Illegal double index\n");
 180                         return -1;
 181                 } else {
 182                         if (matches(*argv, "index") == 0) {
 183                                 NEXT_ARG();
 184                                 if (get_u32(&p.index, *argv, 10)) {
 185                                         fprintf(stderr, "mirred: Illegal \"index\"\n");
 186                                         return -1;
 187                                 }
 188                                 argc--;
 189                                 argv++;
 190                         }
 191                 }
 192         }
 193
 194         if (mirred_d)
 195                 fprintf(stdout, "Action %d device %s ifindex %d\n",p.action, d,p.ifindex);
 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 int
 209 parse_mirred(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
 210 {
 211
 212         int argc = *argc_p;
 213         char **argv = *argv_p;
 214
 215         if (argc < 0) {
 216                 fprintf(stderr,"mirred bad arguement count %d\n", argc);
 217                 return -1;
 218         }
 219
 220         if (matches(*argv, "mirred") == 0) {
 221                 NEXT_ARG();
 222         } else {
 223                 fprintf(stderr,"mirred bad arguement %s\n", *argv);
 224                 return -1;
 225         }
 226
 227
 228         if (matches(*argv, "egress") == 0 || matches(*argv, "index") == 0) {
 229                 int ret = parse_egress(a, &argc, &argv, tca_id, n);
 230                 if (ret == 0) {
 231                         *argc_p = argc;
 232                         *argv_p = argv;
 233                         return 0;
 234                 }
 235
 236         } else if (matches(*argv, "ingress") == 0) {
 237                 fprintf(stderr,"mirred ingress not supported at the moment\n");
 238
 239         } else {
 240                 fprintf(stderr,"mirred not supported %s\n", *argv);
 241         }
 242
 243         return -1;
 244
 245 }
 246
 247 int
 248 print_mirred(struct action_util *au,FILE * f, struct rtattr *arg)
 249 {
 250         struct tc_mirred *p;
 251         struct rtattr *tb[TCA_MIRRED_MAX + 1];
 252         const char *dev;
 253         SPRINT_BUF(b1);
 254
 255         if (arg == NULL)
 256                 return -1;
 257
 258         parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
 259
 260         if (tb[TCA_MIRRED_PARMS] == NULL) {
 261                 fprintf(f, "[NULL mirred parameters]");
 262                 return -1;
 263         }
 264         p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
 265
 266         ll_init_map(&rth);
 267
 268         if ((dev = ll_index_to_name(p->ifindex)) == 0) {
 269                 fprintf(stderr, "Cannot find device %d\n", p->ifindex);
 270                 return -1;
 271         }
 272
 273         fprintf(f, "mirred (%s to device %s) %s", mirred_n2a(p->eaction), dev,action_n2a(p->action, b1, sizeof (b1)));
 274
 275         fprintf(f, "\n ");
 276         fprintf(f, "\tindex %d ref %d bind %d",p->index,p->refcnt,p->bindcnt);
 277
 278         if (show_stats) {
 279                 if (tb[TCA_MIRRED_TM]) {
 280                         struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
 281                         print_tm(f,tm);
 282                 }
 283         }
 284         fprintf(f, "\n ");
 285         return 0;
 286 }
 287
 288 struct action_util mirred_util_util = {
 289         .id = "mirred",
 290         .parse_aopt = parse_mirred,
 291         .print_aopt = print_mirred,
 292 };