tc/m_gact.c

   1 /*
   2  * m_gact.c             generic 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  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21
  22 #include "utils.h"
  23 #include "tc_util.h"
  24 #include <linux/tc_act/tc_gact.h>
  25
  26 /* define to turn on probablity stuff */
  27
  28 #ifdef CONFIG_GACT_PROB
  29 static const char *prob_n2a(int p)
  30 {
  31         if (p == PGACT_NONE)
  32                 return "none";
  33         if (p == PGACT_NETRAND)
  34                 return "netrand";
  35         if (p == PGACT_DETERM)
  36                 return "determ";
  37         return "none";
  38 }
  39 #endif
  40
  41 static void
  42 explain(void)
  43 {
  44 #ifdef CONFIG_GACT_PROB
  45         fprintf(stderr, "Usage: ... gact <ACTION> [RAND] [INDEX]\n");
  46         fprintf(stderr,
  47                 "Where: \tACTION := reclassify | drop | continue | pass | pipe |\n"
  48                 "       \t          goto chain <CHAIN_INDEX> | jump <JUMP_COUNT>\n"
  49                         "\tRAND := random <RANDTYPE> <ACTION> <VAL>\n"
  50                         "\tRANDTYPE := netrand | determ\n"
  51                         "\tVAL : = value not exceeding 10000\n"
  52                         "\tJUMP_COUNT := Absolute jump from start of action list\n"
  53                         "\tINDEX := index value used\n"
  54                         "\n");
  55 #else
  56         fprintf(stderr, "Usage: ... gact <ACTION> [INDEX]\n");
  57         fprintf(stderr,
  58                 "Where: \tACTION := reclassify | drop | continue | pass | pipe |\n"
  59                 "       \t          goto chain <CHAIN_INDEX> | jump <JUMP_COUNT>\n"
  60                 "\tINDEX := index value used\n"
  61                 "\tJUMP_COUNT := Absolute jump from start of action list\n"
  62                 "\n");
  63 #endif
  64 }
  65
  66
  67 static void
  68 usage(void)
  69 {
  70         explain();
  71         exit(-1);
  72 }
  73
  74 static int
  75 parse_gact(struct action_util *a, int *argc_p, char ***argv_p,
  76            int tca_id, struct nlmsghdr *n)
  77 {
  78         int argc = *argc_p;
  79         char **argv = *argv_p;
  80         struct tc_gact p = { 0 };
  81 #ifdef CONFIG_GACT_PROB
  82         int rd = 0;
  83         struct tc_gact_p pp;
  84 #endif
  85         struct rtattr *tail;
  86
  87         if (argc < 0)
  88                 return -1;
  89
  90         if (!matches(*argv, "gact"))
  91                 NEXT_ARG_FWD();
  92         if (parse_action_control(&argc, &argv, &p.action, false))
  93                 usage();        /* does not return */
  94
  95 #ifdef CONFIG_GACT_PROB
  96         if (argc > 0) {
  97                 if (matches(*argv, "random") == 0) {
  98                         rd = 1;
  99                         NEXT_ARG();
 100                         if (matches(*argv, "netrand") == 0) {
 101                                 NEXT_ARG();
 102                                 pp.ptype = PGACT_NETRAND;
 103                         } else if  (matches(*argv, "determ") == 0) {
 104                                 NEXT_ARG();
 105                                 pp.ptype = PGACT_DETERM;
 106                         } else {
 107                                 fprintf(stderr, "Illegal \"random type\"\n");
 108                                 return -1;
 109                         }
 110
 111                         if (parse_action_control(&argc, &argv,
 112                                                  &pp.paction, false) == -1)
 113                                 usage();
 114                         if (get_u16(&pp.pval, *argv, 10)) {
 115                                 fprintf(stderr,
 116                                         "Illegal probability val 0x%x\n",
 117                                         pp.pval);
 118                                 return -1;
 119                         }
 120                         if (pp.pval > 10000) {
 121                                 fprintf(stderr,
 122                                         "Illegal probability val  0x%x\n",
 123                                         pp.pval);
 124                                 return -1;
 125                         }
 126                         argc--;
 127                         argv++;
 128                 } else if (matches(*argv, "help") == 0) {
 129                         usage();
 130                 }
 131         }
 132 #endif
 133
 134         if (argc > 0) {
 135                 if (matches(*argv, "index") == 0) {
 136                         NEXT_ARG();
 137                         if (get_u32(&p.index, *argv, 10)) {
 138                                 fprintf(stderr, "Illegal \"index\"\n");
 139                                 return -1;
 140                         }
 141                         argc--;
 142                         argv++;
 143                 } else if (matches(*argv, "help") == 0) {
 144                         usage();
 145                 }
 146         }
 147
 148         tail = addattr_nest(n, MAX_MSG, tca_id);
 149         addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof(p));
 150 #ifdef CONFIG_GACT_PROB
 151         if (rd)
 152                 addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof(pp));
 153 #endif
 154         addattr_nest_end(n, tail);
 155
 156         *argc_p = argc;
 157         *argv_p = argv;
 158         return 0;
 159 }
 160
 161 static int
 162 print_gact(struct action_util *au, FILE *f, struct rtattr *arg)
 163 {
 164 #ifdef CONFIG_GACT_PROB
 165         struct tc_gact_p *pp = NULL;
 166         struct tc_gact_p pp_dummy;
 167 #endif
 168         struct tc_gact *p = NULL;
 169         struct rtattr *tb[TCA_GACT_MAX + 1];
 170
 171         if (arg == NULL)
 172                 return -1;
 173
 174         parse_rtattr_nested(tb, TCA_GACT_MAX, arg);
 175
 176         if (tb[TCA_GACT_PARMS] == NULL) {
 177                 print_string(PRINT_FP, NULL, "%s", "[NULL gact parameters]");
 178                 return -1;
 179         }
 180         p = RTA_DATA(tb[TCA_GACT_PARMS]);
 181
 182         print_string(PRINT_ANY, "kind", "%s ", "gact");
 183         print_action_control(f, "action ", p->action, "");
 184 #ifdef CONFIG_GACT_PROB
 185         if (tb[TCA_GACT_PROB] != NULL) {
 186                 pp = RTA_DATA(tb[TCA_GACT_PROB]);
 187         } else {
 188                 /* need to keep consistent output */
 189                 memset(&pp_dummy, 0, sizeof(pp_dummy));
 190                 pp = &pp_dummy;
 191         }
 192         open_json_object("prob");
 193         print_string(PRINT_ANY, "random_type", "\n\t random type %s",
 194                      prob_n2a(pp->ptype));
 195         print_action_control(f, " ", pp->paction, " ");
 196         print_int(PRINT_ANY, "val", "val %d", pp->pval);
 197         close_json_object();
 198 #endif
 199         print_uint(PRINT_ANY, "index", "\n\t index %u", p->index);
 200         print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
 201         print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
 202         if (show_stats) {
 203                 if (tb[TCA_GACT_TM]) {
 204                         struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]);
 205
 206                         print_tm(f, tm);
 207                 }
 208         }
 209         print_string(PRINT_FP, NULL, "%s", "\n");
 210         return 0;
 211 }
 212
 213 struct action_util gact_action_util = {
 214         .id = "gact",
 215         .parse_aopt = parse_gact,
 216         .print_aopt = print_gact,
 217 };