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 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 int
  65 parse_egress(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
  66 {
  67
  68         int argc = *argc_p;
  69         char **argv = *argv_p;
  70         int ok = 0, iok = 0, mirror=0,redir=0;
  71         struct tc_mirred p;
  72         struct rtattr *tail;
  73         char d[16];
  74
  75         memset(d,0,sizeof(d)-1);
  76         memset(&p,0,sizeof(struct tc_mirred));
  77
  78         while (argc > 0) {
  79
  80                 if (matches(*argv, "action") == 0) {
  81                         break;
  82                 } else if (matches(*argv, "egress") == 0) {
  83                         NEXT_ARG();
  84                         ok++;
  85                         continue;
  86                 } else {
  87
  88                         if (matches(*argv, "index") == 0) {
  89                                 NEXT_ARG();
  90                                 if (get_u32(&p.index, *argv, 10)) {
  91                                         fprintf(stderr, "Illegal \"index\"\n");
  92                                         return -1;
  93                                 }
  94                                 iok++;
  95                                 if (!ok) {
  96                                         argc--;
  97                                         argv++;
  98                                         break;
  99                                 }
 100                         } else if(!ok) {
 101                                 fprintf(stderr, "was expecting egress (%s)\n", *argv);
 102                                 break;
 103
 104                         } else if (!mirror && matches(*argv, "mirror") == 0) {
 105                                 mirror=1;
 106                                 if (redir) {
 107                                         fprintf(stderr, "Cant have both mirror and redir\n");
 108                                         return -1;
 109                                 }
 110                                 p.eaction = TCA_EGRESS_MIRROR;
 111                                 p.action = TC_ACT_PIPE;
 112                                 ok++;
 113                         } else if (!redir && matches(*argv, "redirect") == 0) {
 114                                 redir=1;
 115                                 if (mirror) {
 116                                         fprintf(stderr, "Cant have both mirror and redir\n");
 117                                         return -1;
 118                                 }
 119                                 p.eaction = TCA_EGRESS_REDIR;
 120                                 p.action = TC_ACT_STOLEN;
 121                                 ok++;
 122                         } else if ((redir || mirror) && matches(*argv, "dev") == 0) {
 123                                 NEXT_ARG();
 124                                 if (strlen(d))
 125                                         duparg("dev", *argv);
 126
 127                                 strncpy(d, *argv, sizeof(d)-1);
 128                                 argc--;
 129                                 argv++;
 130
 131                                 break;
 132
 133                         }
 134                 }
 135
 136                 NEXT_ARG();
 137         }
 138
 139         if (!ok && !iok) {
 140                 return -1;
 141         }
 142
 143
 144
 145         if (d[0])  {
 146                 int idx;
 147                 ll_init_map(&rth);
 148
 149                 if ((idx = ll_name_to_index(d)) == 0) {
 150                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 151                         return -1;
 152                 }
 153
 154                 p.ifindex = idx;
 155         }
 156
 157
 158         if (argc && p.eaction == TCA_EGRESS_MIRROR) {
 159
 160                 if (matches(*argv, "reclassify") == 0) {
 161                         p.action = TC_POLICE_RECLASSIFY;
 162                         NEXT_ARG();
 163                 } else if (matches(*argv, "pipe") == 0) {
 164                         p.action = TC_POLICE_PIPE;
 165                         NEXT_ARG();
 166                 } else if (matches(*argv, "drop") == 0 ||
 167                            matches(*argv, "shot") == 0) {
 168                         p.action = TC_POLICE_SHOT;
 169                         NEXT_ARG();
 170                 } else if (matches(*argv, "continue") == 0) {
 171                         p.action = TC_POLICE_UNSPEC;
 172                         NEXT_ARG();
 173                 } else if (matches(*argv, "pass") == 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 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         } else if (matches(*argv, "help") == 0) {
 239                 usage();
 240         } else {
 241                 fprintf(stderr,"mirred option not supported %s\n", *argv);
 242         }
 243
 244         return -1;
 245
 246 }
 247
 248 int
 249 print_mirred(struct action_util *au,FILE * f, struct rtattr *arg)
 250 {
 251         struct tc_mirred *p;
 252         struct rtattr *tb[TCA_MIRRED_MAX + 1];
 253         const char *dev;
 254         SPRINT_BUF(b1);
 255
 256         if (arg == NULL)
 257                 return -1;
 258
 259         parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
 260
 261         if (tb[TCA_MIRRED_PARMS] == NULL) {
 262                 fprintf(f, "[NULL mirred parameters]");
 263                 return -1;
 264         }
 265         p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
 266
 267         /*
 268         ll_init_map(&rth);
 269         */
 270
 271
 272         if ((dev = ll_index_to_name(p->ifindex)) == 0) {
 273                 fprintf(stderr, "Cannot find device %d\n", p->ifindex);
 274                 return -1;
 275         }
 276
 277         fprintf(f, "mirred (%s to device %s) %s", mirred_n2a(p->eaction), dev,action_n2a(p->action, b1, sizeof (b1)));
 278
 279         fprintf(f, "\n ");
 280         fprintf(f, "\tindex %d ref %d bind %d",p->index,p->refcnt,p->bindcnt);
 281
 282         if (show_stats) {
 283                 if (tb[TCA_MIRRED_TM]) {
 284                         struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
 285                         print_tm(f,tm);
 286                 }
 287         }
 288         fprintf(f, "\n ");
 289         return 0;
 290 }
 291
 292 struct action_util mirred_action_util = {
 293         .id = "mirred",
 294         .parse_aopt = parse_mirred,
 295         .print_aopt = print_mirred,
 296 };