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> | jump <JUMP_COUNT>\n"
  50                         "\tRAND := random <RANDTYPE> <ACTION> <VAL>\n"
  51                         "\tRANDTYPE := netrand | determ\n"
  52                         "\tVAL : = value not exceeding 10000\n"
  53                         "\tJUMP_COUNT := Absolute jump from start of action list\n"
  54                         "\tINDEX := index value used\n"
  55                         "\n");
  56 #else
  57         fprintf(stderr, "Usage: ... gact <ACTION> [INDEX]\n");
  58         fprintf(stderr,
  59                 "Where: \tACTION := reclassify | drop | continue | pass | pipe |\n"
  60                 "       \t          goto chain <CHAIN_INDEX> | jump <JUMP_COUNT>\n"
  61                 "\tINDEX := index value used\n"
  62                 "\tJUMP_COUNT := Absolute jump from start of action list\n"
  63                 "\n");
  64 #endif
  65 }
  66
  67
  68 static void
  69 usage(void)
  70 {
  71         explain();
  72         exit(-1);
  73 }
  74
  75 static int
  76 parse_gact(struct action_util *a, int *argc_p, char ***argv_p,
  77            int tca_id, struct nlmsghdr *n)
  78 {
  79         int argc = *argc_p;
  80         char **argv = *argv_p;
  81         struct tc_gact p = { 0 };
  82 #ifdef CONFIG_GACT_PROB
  83         int rd = 0;
  84         struct tc_gact_p pp;
  85 #endif
  86         struct rtattr *tail;
  87
  88         if (argc < 0)
  89                 return -1;
  90
  91
  92         if (matches(*argv, "gact") == 0) {
  93                 argc--;
  94                 argv++;
  95         } else if (parse_action_control(&argc, &argv, &p.action, false) == -1) {
  96                 usage();        /* does not return */
  97         }
  98
  99 #ifdef CONFIG_GACT_PROB
 100         if (argc > 0) {
 101                 if (matches(*argv, "random") == 0) {
 102                         rd = 1;
 103                         NEXT_ARG();
 104                         if (matches(*argv, "netrand") == 0) {
 105                                 NEXT_ARG();
 106                                 pp.ptype = PGACT_NETRAND;
 107                         } else if  (matches(*argv, "determ") == 0) {
 108                                 NEXT_ARG();
 109                                 pp.ptype = PGACT_DETERM;
 110                         } else {
 111                                 fprintf(stderr, "Illegal \"random type\"\n");
 112                                 return -1;
 113                         }
 114
 115                         if (parse_action_control(&argc, &argv,
 116                                                  &pp.paction, false) == -1)
 117                                 usage();
 118                         if (get_u16(&pp.pval, *argv, 10)) {
 119                                 fprintf(stderr, "Illegal probability val 0x%x\n", pp.pval);
 120                                 return -1;
 121                         }
 122                         if (pp.pval > 10000) {
 123                                 fprintf(stderr, "Illegal probability val  0x%x\n", 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 = NLMSG_TAIL(n);
 149         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 150         addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof(p));
 151 #ifdef CONFIG_GACT_PROB
 152         if (rd) {
 153                 addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof(pp));
 154         }
 155 #endif
 156         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 157
 158         *argc_p = argc;
 159         *argv_p = argv;
 160         return 0;
 161 }
 162
 163 static int
 164 print_gact(struct action_util *au, FILE * f, struct rtattr *arg)
 165 {
 166 #ifdef CONFIG_GACT_PROB
 167         struct tc_gact_p *pp = NULL;
 168         struct tc_gact_p pp_dummy;
 169 #endif
 170         struct tc_gact *p = NULL;
 171         struct rtattr *tb[TCA_GACT_MAX + 1];
 172
 173         if (arg == NULL)
 174                 return -1;
 175
 176         parse_rtattr_nested(tb, TCA_GACT_MAX, arg);
 177
 178         if (tb[TCA_GACT_PARMS] == NULL) {
 179                 fprintf(f, "[NULL gact parameters]");
 180                 return -1;
 181         }
 182         p = RTA_DATA(tb[TCA_GACT_PARMS]);
 183
 184         fprintf(f, "gact ");
 185         print_action_control(f, "action ", p->action, "");
 186 #ifdef CONFIG_GACT_PROB
 187         if (tb[TCA_GACT_PROB] != NULL) {
 188                 pp = RTA_DATA(tb[TCA_GACT_PROB]);
 189         } else {
 190                 /* need to keep consistent output */
 191                 memset(&pp_dummy, 0, sizeof(pp_dummy));
 192                 pp = &pp_dummy;
 193         }
 194         fprintf(f, "\n\t random type %s", prob_n2a(pp->ptype));
 195         print_action_control(f, " ", pp->paction, " ");
 196         fprintf(f, "val %d", pp->pval);
 197 #endif
 198         fprintf(f, "\n\t index %u ref %d bind %d", p->index, p->refcnt,
 199                 p->bindcnt);
 200         if (show_stats) {
 201                 if (tb[TCA_GACT_TM]) {
 202                         struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]);
 203
 204                         print_tm(f, tm);
 205                 }
 206         }
 207         fprintf(f, "\n ");
 208         return 0;
 209 }
 210
 211 struct action_util gact_action_util = {
 212         .id = "gact",
 213         .parse_aopt = parse_gact,
 214         .print_aopt = print_gact,
 215 };