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