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 <fcntl.h>
  19 #include <sys/socket.h>
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #include <string.h>
  23 #include "utils.h"
  24 #include "tc_util.h"
  25 #include "tc_common.h"
  26 #include <linux/tc_act/tc_mirred.h>
  27
  28 static void
  29 explain(void)
  30 {
  31         fprintf(stderr,
  32                 "Usage: mirred <DIRECTION> <ACTION> [index INDEX] <dev DEVICENAME>\n"
  33                 "where:\n"
  34                 "\tDIRECTION := <ingress | egress>\n"
  35                 "\tACTION := <mirror | redirect>\n"
  36                 "\tINDEX  is the specific policy instance id\n"
  37                 "\tDEVICENAME is the devicename\n");
  38 }
  39
  40 static void
  41 usage(void)
  42 {
  43         explain();
  44         exit(-1);
  45 }
  46
  47 static const char *mirred_n2a(int action)
  48 {
  49         switch (action) {
  50         case TCA_EGRESS_REDIR:
  51                 return "Egress Redirect";
  52         case TCA_INGRESS_REDIR:
  53                 return "Ingress Redirect";
  54         case TCA_EGRESS_MIRROR:
  55                 return "Egress Mirror";
  56         case TCA_INGRESS_MIRROR:
  57                 return "Ingress Mirror";
  58         default:
  59                 return "unknown";
  60         }
  61 }
  62
  63 static const char *mirred_direction(int action)
  64 {
  65         switch (action) {
  66         case TCA_EGRESS_REDIR:
  67         case TCA_EGRESS_MIRROR:
  68                 return "egress";
  69         case TCA_INGRESS_REDIR:
  70         case TCA_INGRESS_MIRROR:
  71                 return "ingress";
  72         default:
  73                 return "unknown";
  74         }
  75 }
  76
  77 static const char *mirred_action(int action)
  78 {
  79         switch (action) {
  80         case TCA_EGRESS_REDIR:
  81         case TCA_INGRESS_REDIR:
  82                 return "redirect";
  83         case TCA_EGRESS_MIRROR:
  84         case TCA_INGRESS_MIRROR:
  85                 return "mirror";
  86         default:
  87                 return "unknown";
  88         }
  89 }
  90
  91 static int
  92 parse_direction(struct action_util *a, int *argc_p, char ***argv_p,
  93                 int tca_id, struct nlmsghdr *n)
  94 {
  95
  96         int argc = *argc_p;
  97         char **argv = *argv_p;
  98         int ok = 0, iok = 0, mirror = 0, redir = 0, ingress = 0, egress = 0;
  99         struct tc_mirred p = {};
 100         struct rtattr *tail;
 101         char d[IFNAMSIZ] = {};
 102
 103         while (argc > 0) {
 104
 105                 if (matches(*argv, "action") == 0) {
 106                         break;
 107                 } else if (!egress && matches(*argv, "egress") == 0) {
 108                         egress = 1;
 109                         if (ingress) {
 110                                 fprintf(stderr,
 111                                         "Can't have both egress and ingress\n");
 112                                 return -1;
 113                         }
 114                         NEXT_ARG();
 115                         ok++;
 116                         continue;
 117                 } else if (!ingress && matches(*argv, "ingress") == 0) {
 118                         ingress = 1;
 119                         if (egress) {
 120                                 fprintf(stderr,
 121                                         "Can't have both ingress and egress\n");
 122                                 return -1;
 123                         }
 124                         NEXT_ARG();
 125                         ok++;
 126                         continue;
 127                 } else {
 128
 129                         if (matches(*argv, "index") == 0) {
 130                                 NEXT_ARG();
 131                                 if (get_u32(&p.index, *argv, 10)) {
 132                                         fprintf(stderr, "Illegal \"index\"\n");
 133                                         return -1;
 134                                 }
 135                                 iok++;
 136                                 if (!ok) {
 137                                         argc--;
 138                                         argv++;
 139                                         break;
 140                                 }
 141                         } else if (!ok) {
 142                                 fprintf(stderr,
 143                                         "was expecting egress or ingress (%s)\n",
 144                                         *argv);
 145                                 break;
 146
 147                         } else if (!mirror && matches(*argv, "mirror") == 0) {
 148                                 mirror = 1;
 149                                 if (redir) {
 150                                         fprintf(stderr,
 151                                                 "Can't have both mirror and redir\n");
 152                                         return -1;
 153                                 }
 154                                 p.eaction = egress ? TCA_EGRESS_MIRROR :
 155                                         TCA_INGRESS_MIRROR;
 156                                 p.action = TC_ACT_PIPE;
 157                                 ok++;
 158                         } else if (!redir && matches(*argv, "redirect") == 0) {
 159                                 redir = 1;
 160                                 if (mirror) {
 161                                         fprintf(stderr,
 162                                                 "Can't have both mirror and redir\n");
 163                                         return -1;
 164                                 }
 165                                 p.eaction = egress ? TCA_EGRESS_REDIR :
 166                                         TCA_INGRESS_REDIR;
 167                                 p.action = TC_ACT_STOLEN;
 168                                 ok++;
 169                         } else if ((redir || mirror) &&
 170                                    matches(*argv, "dev") == 0) {
 171                                 NEXT_ARG();
 172                                 if (strlen(d))
 173                                         duparg("dev", *argv);
 174
 175                                 strncpy(d, *argv, sizeof(d)-1);
 176                                 argc--;
 177                                 argv++;
 178
 179                                 break;
 180
 181                         }
 182                 }
 183
 184                 NEXT_ARG();
 185         }
 186
 187         if (!ok && !iok)
 188                 return -1;
 189
 190         if (d[0])  {
 191                 int idx;
 192
 193                 ll_init_map(&rth);
 194
 195                 idx = ll_name_to_index(d);
 196                 if (idx == 0) {
 197                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 198                         return -1;
 199                 }
 200
 201                 p.ifindex = idx;
 202         }
 203
 204
 205         if (p.eaction == TCA_EGRESS_MIRROR || p.eaction == TCA_INGRESS_MIRROR) {
 206                 parse_action_control(&argc, &argv, &p.action, false);
 207                 NEXT_ARG_FWD();
 208         }
 209
 210         if (argc) {
 211                 if (iok && matches(*argv, "index") == 0) {
 212                         fprintf(stderr, "mirred: Illegal double index\n");
 213                         return -1;
 214                 }
 215
 216                 if (matches(*argv, "index") == 0) {
 217                         NEXT_ARG();
 218                         if (get_u32(&p.index, *argv, 10)) {
 219                                 fprintf(stderr,
 220                                         "mirred: Illegal \"index\"\n");
 221                                 return -1;
 222                         }
 223                         argc--;
 224                         argv++;
 225                 }
 226         }
 227
 228         tail = addattr_nest(n, MAX_MSG, tca_id);
 229         addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof(p));
 230         addattr_nest_end(n, tail);
 231
 232         *argc_p = argc;
 233         *argv_p = argv;
 234         return 0;
 235 }
 236
 237
 238 static int
 239 parse_mirred(struct action_util *a, int *argc_p, char ***argv_p,
 240              int tca_id, struct nlmsghdr *n)
 241 {
 242
 243         int argc = *argc_p;
 244         char **argv = *argv_p;
 245
 246         if (argc < 0) {
 247                 fprintf(stderr, "mirred bad argument count %d\n", argc);
 248                 return -1;
 249         }
 250
 251         if (matches(*argv, "mirred") == 0) {
 252                 NEXT_ARG();
 253         } else {
 254                 fprintf(stderr, "mirred bad argument %s\n", *argv);
 255                 return -1;
 256         }
 257
 258
 259         if (matches(*argv, "egress") == 0 || matches(*argv, "ingress") == 0 ||
 260             matches(*argv, "index") == 0) {
 261                 int ret = parse_direction(a, &argc, &argv, tca_id, n);
 262
 263                 if (ret == 0) {
 264                         *argc_p = argc;
 265                         *argv_p = argv;
 266                         return 0;
 267                 }
 268
 269         } else if (matches(*argv, "help") == 0) {
 270                 usage();
 271         } else {
 272                 fprintf(stderr, "mirred option not supported %s\n", *argv);
 273         }
 274
 275         return -1;
 276
 277 }
 278
 279 static int
 280 print_mirred(struct action_util *au, FILE *f, struct rtattr *arg)
 281 {
 282         struct tc_mirred *p;
 283         struct rtattr *tb[TCA_MIRRED_MAX + 1];
 284         const char *dev;
 285
 286         if (arg == NULL)
 287                 return -1;
 288
 289         parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
 290
 291         if (tb[TCA_MIRRED_PARMS] == NULL) {
 292                 print_string(PRINT_FP, NULL, "%s", "[NULL mirred parameters]");
 293                 return -1;
 294         }
 295         p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
 296
 297         dev = ll_index_to_name(p->ifindex);
 298         if (dev == 0) {
 299                 fprintf(stderr, "Cannot find device %d\n", p->ifindex);
 300                 return -1;
 301         }
 302
 303         print_string(PRINT_ANY, "kind", "%s ", "mirred");
 304         print_string(PRINT_FP, NULL, "(%s", mirred_n2a(p->eaction));
 305         print_string(PRINT_JSON, "mirred_action", NULL,
 306                      mirred_action(p->eaction));
 307         print_string(PRINT_JSON, "direction", NULL,
 308                      mirred_direction(p->eaction));
 309         print_string(PRINT_ANY, "to_dev", " to device %s)", dev);
 310         print_action_control(f, " ", p->action, "");
 311
 312         print_uint(PRINT_ANY, "index", "\n \tindex %u", p->index);
 313         print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
 314         print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
 315
 316         if (show_stats) {
 317                 if (tb[TCA_MIRRED_TM]) {
 318                         struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
 319
 320                         print_tm(f, tm);
 321                 }
 322         }
 323         print_string(PRINT_FP, NULL, "%s", "\n ");
 324         return 0;
 325 }
 326
 327 struct action_util mirred_action_util = {
 328         .id = "mirred",
 329         .parse_aopt = parse_mirred,
 330         .print_aopt = print_mirred,
 331 };