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 <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <string.h>
  22
  23 #include "utils.h"
  24 #include "tc_util.h"
  25 #include <linux/tc_act/tc_gact.h>
  26
  27 /* define to turn on probablity stuff */
  28
  29 #ifdef CONFIG_GACT_PROB
  30 static const char *prob_n2a(int p)
  31 {
  32         if (p == PGACT_NONE)
  33                 return "none";
  34         if (p == PGACT_NETRAND)
  35                 return "netrand";
  36         if (p == PGACT_DETERM)
  37                 return "determ";
  38         return "none";
  39 }
  40 #endif
  41
  42 static void
  43 explain(void)
  44 {
  45 #ifdef CONFIG_GACT_PROB
  46         fprintf(stderr, "Usage: ... gact <ACTION> [RAND] [INDEX]\n");
  47         fprintf(stderr,
  48                 "Where: \tACTION := reclassify | drop | continue | pass | pipe |\n"
  49                 "       \t          goto chain <CHAIN_INDEX>\n"
  50                         "\tRAND := random <RANDTYPE> <ACTION> <VAL>\n"
  51                         "\tRANDTYPE := netrand | determ\n"
  52                         "\tVAL : = value not exceeding 10000\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>\n"
  60                 "\tINDEX := index value used\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         int ok = 0;
  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
  91         if (matches(*argv, "gact") == 0) {
  92                 ok++;
  93                 argc--;
  94                 argv++;
  95         } else {
  96                 if (parse_action_control(&argc, &argv, &p.action, false) == -1)
  97                         usage();
  98                 ok++;
  99         }
 100
 101 #ifdef CONFIG_GACT_PROB
 102         if (ok && argc > 0) {
 103                 if (matches(*argv, "random") == 0) {
 104                         rd = 1;
 105                         NEXT_ARG();
 106                         if (matches(*argv, "netrand") == 0) {
 107                                 NEXT_ARG();
 108                                 pp.ptype = PGACT_NETRAND;
 109                         } else if  (matches(*argv, "determ") == 0) {
 110                                 NEXT_ARG();
 111                                 pp.ptype = PGACT_DETERM;
 112                         } else {
 113                                 fprintf(stderr, "Illegal \"random type\"\n");
 114                                 return -1;
 115                         }
 116
 117                         if (parse_action_control(&argc, &argv,
 118                                                  &pp.paction, false) == -1)
 119                                 usage();
 120                         if (get_u16(&pp.pval, *argv, 10)) {
 121                                 fprintf(stderr, "Illegal probability val 0x%x\n", pp.pval);
 122                                 return -1;
 123                         }
 124                         if (pp.pval > 10000) {
 125                                 fprintf(stderr, "Illegal probability val  0x%x\n", 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                         NEXT_ARG();
 139                         if (get_u32(&p.index, *argv, 10)) {
 140                                 fprintf(stderr, "Illegal \"index\"\n");
 141                                 return -1;
 142                         }
 143                         argc--;
 144                         argv++;
 145                         ok++;
 146                 } else if (matches(*argv, "help") == 0) {
 147                                 usage();
 148                 }
 149         }
 150
 151         if (!ok)
 152                 return -1;
 153
 154         tail = NLMSG_TAIL(n);
 155         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 156         addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof(p));
 157 #ifdef CONFIG_GACT_PROB
 158         if (rd) {
 159                 addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof(pp));
 160         }
 161 #endif
 162         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 163
 164         *argc_p = argc;
 165         *argv_p = argv;
 166         return 0;
 167 }
 168
 169 static int
 170 print_gact(struct action_util *au, FILE * f, struct rtattr *arg)
 171 {
 172 #ifdef CONFIG_GACT_PROB
 173         struct tc_gact_p *pp = NULL;
 174         struct tc_gact_p pp_dummy;
 175 #endif
 176         struct tc_gact *p = NULL;
 177         struct rtattr *tb[TCA_GACT_MAX + 1];
 178
 179         if (arg == NULL)
 180                 return -1;
 181
 182         parse_rtattr_nested(tb, TCA_GACT_MAX, arg);
 183
 184         if (tb[TCA_GACT_PARMS] == NULL) {
 185                 fprintf(f, "[NULL gact parameters]");
 186                 return -1;
 187         }
 188         p = RTA_DATA(tb[TCA_GACT_PARMS]);
 189
 190         fprintf(f, "gact ");
 191         print_action_control(f, "action ", p->action, "");
 192 #ifdef CONFIG_GACT_PROB
 193         if (tb[TCA_GACT_PROB] != NULL) {
 194                 pp = RTA_DATA(tb[TCA_GACT_PROB]);
 195         } else {
 196                 /* need to keep consistent output */
 197                 memset(&pp_dummy, 0, sizeof(pp_dummy));
 198                 pp = &pp_dummy;
 199         }
 200         fprintf(f, "\n\t random type %s", prob_n2a(pp->ptype));
 201         print_action_control(f, " ", pp->paction, " ");
 202         fprintf(f, "val %d", pp->pval);
 203 #endif
 204         fprintf(f, "\n\t index %u ref %d bind %d", p->index, p->refcnt,
 205                 p->bindcnt);
 206         if (show_stats) {
 207                 if (tb[TCA_GACT_TM]) {
 208                         struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]);
 209
 210                         print_tm(f, tm);
 211                 }
 212         }
 213         fprintf(f, "\n ");
 214         return 0;
 215 }
 216
 217 struct action_util gact_action_util = {
 218         .id = "gact",
 219         .parse_aopt = parse_gact,
 220         .print_aopt = print_gact,
 221 };