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\n"
  49                         "\tRAND := random <RANDTYPE> <ACTION> <VAL>\n"
  50                         "\tRANDTYPE := netrand | determ\n"
  51                         "\tVAL : = value not exceeding 10000\n"
  52                         "\tINDEX := index value used\n"
  53                         "\n");
  54 #else
  55         fprintf(stderr, "Usage: ... gact <ACTION> [INDEX]\n");
  56         fprintf(stderr,
  57                 "Where: \tACTION := reclassify | drop | continue | pass\n"
  58                 "\tINDEX := index value used\n"
  59                 "\n");
  60 #endif
  61 }
  62
  63
  64 static void
  65 usage(void)
  66 {
  67         explain();
  68         exit(-1);
  69 }
  70
  71 static int
  72 get_act(char ***argv_p)
  73 {
  74         int n;
  75
  76         if (!action_a2n(**argv_p, &n, false)) {
  77                 fprintf(stderr, "bad action type %s\n", **argv_p);
  78                 return -10;
  79         }
  80         return n;
  81 }
  82
  83 static int
  84 parse_gact(struct action_util *a, int *argc_p, char ***argv_p,
  85            int tca_id, struct nlmsghdr *n)
  86 {
  87         int argc = *argc_p;
  88         char **argv = *argv_p;
  89         int ok = 0;
  90         int action = TC_POLICE_RECLASSIFY;
  91         struct tc_gact p = { .action = TC_POLICE_RECLASSIFY };
  92 #ifdef CONFIG_GACT_PROB
  93         int rd = 0;
  94         struct tc_gact_p pp;
  95 #endif
  96         struct rtattr *tail;
  97
  98         if (argc < 0)
  99                 return -1;
 100
 101
 102         if (matches(*argv, "gact") == 0) {
 103                 ok++;
 104         } else {
 105                 action = get_act(&argv);
 106                 if (action != -10) {
 107                         p.action = action;
 108                         ok++;
 109                 } else {
 110                         explain();
 111                         return action;
 112                 }
 113         }
 114
 115         if (ok) {
 116                 argc--;
 117                 argv++;
 118         }
 119
 120 #ifdef CONFIG_GACT_PROB
 121         if (ok && argc > 0) {
 122                 if (matches(*argv, "random") == 0) {
 123                         rd = 1;
 124                         NEXT_ARG();
 125                         if (matches(*argv, "netrand") == 0) {
 126                                 NEXT_ARG();
 127                                 pp.ptype = PGACT_NETRAND;
 128                         } else if  (matches(*argv, "determ") == 0) {
 129                                 NEXT_ARG();
 130                                 pp.ptype = PGACT_DETERM;
 131                         } else {
 132                                 fprintf(stderr, "Illegal \"random type\"\n");
 133                                 return -1;
 134                         }
 135
 136                         action = get_act(&argv);
 137                         if (action != -10) { /* FIXME */
 138                                 pp.paction = action;
 139                         } else {
 140                                 explain();
 141                                 return -1;
 142                         }
 143                         argc--;
 144                         argv++;
 145                         if (get_u16(&pp.pval, *argv, 10)) {
 146                                 fprintf(stderr, "Illegal probability val 0x%x\n", pp.pval);
 147                                 return -1;
 148                         }
 149                         if (pp.pval > 10000) {
 150                                 fprintf(stderr, "Illegal probability val  0x%x\n", pp.pval);
 151                                 return -1;
 152                         }
 153                         argc--;
 154                         argv++;
 155                 } else if (matches(*argv, "help") == 0) {
 156                                 usage();
 157                 }
 158         }
 159 #endif
 160
 161         if (argc > 0) {
 162                 if (matches(*argv, "index") == 0) {
 163                         NEXT_ARG();
 164                         if (get_u32(&p.index, *argv, 10)) {
 165                                 fprintf(stderr, "Illegal \"index\"\n");
 166                                 return -1;
 167                         }
 168                         argc--;
 169                         argv++;
 170                         ok++;
 171                 } else if (matches(*argv, "help") == 0) {
 172                                 usage();
 173                 }
 174         }
 175
 176         if (!ok)
 177                 return -1;
 178
 179         tail = NLMSG_TAIL(n);
 180         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 181         addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof(p));
 182 #ifdef CONFIG_GACT_PROB
 183         if (rd) {
 184                 addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof(pp));
 185         }
 186 #endif
 187         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 188
 189         *argc_p = argc;
 190         *argv_p = argv;
 191         return 0;
 192 }
 193
 194 static int
 195 print_gact(struct action_util *au, FILE * f, struct rtattr *arg)
 196 {
 197         SPRINT_BUF(b1);
 198 #ifdef CONFIG_GACT_PROB
 199         SPRINT_BUF(b2);
 200         struct tc_gact_p *pp = NULL;
 201         struct tc_gact_p pp_dummy;
 202 #endif
 203         struct tc_gact *p = NULL;
 204         struct rtattr *tb[TCA_GACT_MAX + 1];
 205
 206         if (arg == NULL)
 207                 return -1;
 208
 209         parse_rtattr_nested(tb, TCA_GACT_MAX, arg);
 210
 211         if (tb[TCA_GACT_PARMS] == NULL) {
 212                 fprintf(f, "[NULL gact parameters]");
 213                 return -1;
 214         }
 215         p = RTA_DATA(tb[TCA_GACT_PARMS]);
 216
 217         fprintf(f, "gact action %s", action_n2a(p->action, b1, sizeof(b1)));
 218 #ifdef CONFIG_GACT_PROB
 219         if (tb[TCA_GACT_PROB] != NULL) {
 220                 pp = RTA_DATA(tb[TCA_GACT_PROB]);
 221         } else {
 222                 /* need to keep consistent output */
 223                 memset(&pp_dummy, 0, sizeof(pp_dummy));
 224                 pp = &pp_dummy;
 225         }
 226         fprintf(f, "\n\t random type %s %s val %d", prob_n2a(pp->ptype), action_n2a(pp->paction, b2, sizeof (b2)), pp->pval);
 227 #endif
 228         fprintf(f, "\n\t index %d ref %d bind %d", p->index, p->refcnt, p->bindcnt);
 229         if (show_stats) {
 230                 if (tb[TCA_GACT_TM]) {
 231                         struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]);
 232
 233                         print_tm(f, tm);
 234                 }
 235         }
 236         fprintf(f, "\n ");
 237         return 0;
 238 }
 239
 240 struct action_util gact_action_util = {
 241         .id = "gact",
 242         .parse_aopt = parse_gact,
 243         .print_aopt = print_gact,
 244 };