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                 "Where: \tACTION := reclassify | drop | continue | pass | pipe |\n"
  58                 "       \t          goto chain <CHAIN_INDEX> | jump <JUMP_COUNT>\n"
  59                 "\tINDEX := index value used\n"
  60                 "\tJUMP_COUNT := Absolute jump from start of action list\n"
  61                 "\n");
  62 #endif
  63 }
  64
  65
  66 static void
  67 usage(void)
  68 {
  69         explain();
  70         exit(-1);
  71 }
  72
  73 static int
  74 parse_gact(struct action_util *a, int *argc_p, char ***argv_p,
  75            int tca_id, struct nlmsghdr *n)
  76 {
  77         int argc = *argc_p;
  78         char **argv = *argv_p;
  79         struct tc_gact p = { 0 };
  80 #ifdef CONFIG_GACT_PROB
  81         int rd = 0;
  82         struct tc_gact_p pp;
  83 #endif
  84         struct rtattr *tail;
  85
  86         if (argc < 0)
  87                 return -1;
  88
  89         if (!matches(*argv, "gact"))
  90                 NEXT_ARG();
  91         /* we're binding existing gact action to filter by index. */
  92         if (!matches(*argv, "index"))
  93                 goto skip_args;
  94         if (parse_action_control(&argc, &argv, &p.action, false))
  95                 usage();        /* does not return */
  96
  97 #ifdef CONFIG_GACT_PROB
  98         if (argc > 0) {
  99                 if (matches(*argv, "random") == 0) {
 100                         rd = 1;
 101                         NEXT_ARG();
 102                         if (matches(*argv, "netrand") == 0) {
 103                                 NEXT_ARG();
 104                                 pp.ptype = PGACT_NETRAND;
 105                         } else if  (matches(*argv, "determ") == 0) {
 106                                 NEXT_ARG();
 107                                 pp.ptype = PGACT_DETERM;
 108                         } else {
 109                                 fprintf(stderr, "Illegal \"random type\"\n");
 110                                 return -1;
 111                         }
 112
 113                         if (parse_action_control(&argc, &argv,
 114                                                  &pp.paction, false) == -1)
 115                                 usage();
 116                         if (get_u16(&pp.pval, *argv, 10)) {
 117                                 fprintf(stderr,
 118                                         "Illegal probability val 0x%x\n",
 119                                         pp.pval);
 120                                 return -1;
 121                         }
 122                         if (pp.pval > 10000) {
 123                                 fprintf(stderr,
 124                                         "Illegal probability val  0x%x\n",
 125                                         pp.pval);
 126                                 return -1;
 127                         }
 128                         argc--;
 129                         argv++;
 130                 } else if (matches(*argv, "help") == 0) {
 131                         usage();
 132                 }
 133         }
 134 #endif
 135
 136         if (argc > 0) {
 137                 if (matches(*argv, "index") == 0) {
 138 skip_args:
 139                         NEXT_ARG();
 140                         if (get_u32(&p.index, *argv, 10)) {
 141                                 fprintf(stderr, "Illegal \"index\"\n");
 142                                 return -1;
 143                         }
 144                         argc--;
 145                         argv++;
 146                 } else if (matches(*argv, "help") == 0) {
 147                         usage();
 148                 }
 149         }
 150
 151         tail = addattr_nest(n, MAX_MSG, tca_id);
 152         addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof(p));
 153 #ifdef CONFIG_GACT_PROB
 154         if (rd)
 155                 addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof(pp));
 156 #endif
 157         addattr_nest_end(n, tail);
 158
 159         *argc_p = argc;
 160         *argv_p = argv;
 161         return 0;
 162 }
 163
 164 static int
 165 print_gact(struct action_util *au, FILE *f, struct rtattr *arg)
 166 {
 167 #ifdef CONFIG_GACT_PROB
 168         struct tc_gact_p *pp = NULL;
 169         struct tc_gact_p pp_dummy;
 170 #endif
 171         struct tc_gact *p = NULL;
 172         struct rtattr *tb[TCA_GACT_MAX + 1];
 173
 174         if (arg == NULL)
 175                 return -1;
 176
 177         parse_rtattr_nested(tb, TCA_GACT_MAX, arg);
 178
 179         if (tb[TCA_GACT_PARMS] == NULL) {
 180                 fprintf(stderr, "Missing gact parameters\n");
 181                 return -1;
 182         }
 183         p = RTA_DATA(tb[TCA_GACT_PARMS]);
 184
 185         print_string(PRINT_ANY, "kind", "%s ", "gact");
 186         print_action_control(f, "action ", p->action, "");
 187 #ifdef CONFIG_GACT_PROB
 188         if (tb[TCA_GACT_PROB] != NULL) {
 189                 pp = RTA_DATA(tb[TCA_GACT_PROB]);
 190         } else {
 191                 /* need to keep consistent output */
 192                 memset(&pp_dummy, 0, sizeof(pp_dummy));
 193                 pp = &pp_dummy;
 194         }
 195         open_json_object("prob");
 196         print_string(PRINT_ANY, "random_type", "\n\t random type %s",
 197                      prob_n2a(pp->ptype));
 198         print_action_control(f, " ", pp->paction, " ");
 199         print_int(PRINT_ANY, "val", "val %d", pp->pval);
 200         close_json_object();
 201 #endif
 202         print_uint(PRINT_ANY, "index", "\n\t index %u", p->index);
 203         print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
 204         print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
 205         if (show_stats) {
 206                 if (tb[TCA_GACT_TM]) {
 207                         struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]);
 208
 209                         print_tm(f, tm);
 210                 }
 211         }
 212         print_string(PRINT_FP, NULL, "%s", "\n");
 213         return 0;
 214 }
 215
 216 struct action_util gact_action_util = {
 217         .id = "gact",
 218         .parse_aopt = parse_gact,
 219         .print_aopt = print_gact,
 220 };