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 static void
  64 usage(void)
  65 {
  66         explain();
  67         exit(-1);
  68 }
  69
  70
  71 int
  72 get_act(char ***argv_p)
  73 {
  74         char **argv = *argv_p;
  75
  76         if (matches(*argv, "reclassify") == 0) {
  77                 return TC_ACT_RECLASSIFY;
  78         } else if (matches(*argv, "drop") == 0 || matches(*argv, "shot") == 0) {
  79                 return TC_ACT_SHOT;
  80         } else if (matches(*argv, "continue") == 0) {
  81                 return TC_ACT_UNSPEC;
  82         } else if (matches(*argv, "pipe") == 0) {
  83                 return TC_ACT_PIPE;
  84         } else if (matches(*argv, "pass") == 0 || matches(*argv, "ok") == 0)  {
  85                 return TC_ACT_OK;
  86         } else {
  87                 fprintf(stderr,"bad action type %s\n",*argv);
  88                 return -10;
  89         }
  90 }
  91
  92 int
  93 parse_gact(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
  94 {
  95         int argc = *argc_p;
  96         char **argv = *argv_p;
  97         int ok = 0;
  98         int action = TC_POLICE_RECLASSIFY;
  99         struct tc_gact p;
 100 #ifdef CONFIG_GACT_PROB
 101         int rd = 0;
 102         struct tc_gact_p pp;
 103 #endif
 104         struct rtattr *tail;
 105
 106         memset(&p, 0, sizeof (p));
 107         p.action = TC_POLICE_RECLASSIFY;
 108
 109         if (argc < 0)
 110                 return -1;
 111
 112
 113         if (matches(*argv, "gact") == 0) {
 114                 ok++;
 115         } else {
 116                 action = get_act(&argv);
 117                 if (action != -10) {
 118                         p.action = action;
 119                         ok++;
 120                 } else {
 121                         explain();
 122                         return action;
 123                 }
 124         }
 125
 126         if (ok) {
 127                 argc--;
 128                 argv++;
 129         }
 130
 131 #ifdef CONFIG_GACT_PROB
 132         if (ok && argc > 0) {
 133                 if (matches(*argv, "random") == 0) {
 134                         rd = 1;
 135                         NEXT_ARG();
 136                         if (matches(*argv, "netrand") == 0) {
 137                                 NEXT_ARG();
 138                                 pp.ptype = PGACT_NETRAND;
 139                         } else if  (matches(*argv, "determ") == 0) {
 140                                 NEXT_ARG();
 141                                 pp.ptype = PGACT_DETERM;
 142                         } else {
 143                                 fprintf(stderr, "Illegal \"random type\"\n");
 144                                 return -1;
 145                         }
 146
 147                         action = get_act(&argv);
 148                         if (action != -10) { /* FIXME */
 149                                 pp.paction = action;
 150                         } else {
 151                                 explain();
 152                                 return -1;
 153                         }
 154                         argc--;
 155                         argv++;
 156                         if (get_u16(&pp.pval, *argv, 10)) {
 157                                 fprintf(stderr, "Illegal probability val 0x%x\n",pp.pval);
 158                                 return -1;
 159                         }
 160                         if (pp.pval > 10000) {
 161                                 fprintf(stderr, "Illegal probability val  0x%x\n",pp.pval);
 162                                 return -1;
 163                         }
 164                         argc--;
 165                         argv++;
 166                 } else if (matches(*argv, "help") == 0) {
 167                                 usage();
 168                 }
 169         }
 170 #endif
 171
 172         if (argc > 0) {
 173                 if (matches(*argv, "index") == 0) {
 174                         NEXT_ARG();
 175                         if (get_u32(&p.index, *argv, 10)) {
 176                                 fprintf(stderr, "Illegal \"index\"\n");
 177                                 return -1;
 178                         }
 179                         argc--;
 180                         argv++;
 181                         ok++;
 182                 } else if (matches(*argv, "help") == 0) {
 183                         usage();
 184                 }
 185         }
 186
 187         if (!ok)
 188                 return -1;
 189
 190         tail = NLMSG_TAIL(n);
 191         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 192         addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof (p));
 193 #ifdef CONFIG_GACT_PROB
 194         if (rd) {
 195                 addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof (pp));
 196         }
 197 #endif
 198         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 199
 200         *argc_p = argc;
 201         *argv_p = argv;
 202         return 0;
 203 }
 204
 205 int
 206 print_gact(struct action_util *au,FILE * f, struct rtattr *arg)
 207 {
 208         SPRINT_BUF(b1);
 209 #ifdef CONFIG_GACT_PROB
 210         SPRINT_BUF(b2);
 211         struct tc_gact_p *pp = NULL;
 212         struct tc_gact_p pp_dummy;
 213 #endif
 214         struct tc_gact *p = NULL;
 215         struct rtattr *tb[TCA_GACT_MAX + 1];
 216
 217         if (arg == NULL)
 218                 return -1;
 219
 220         parse_rtattr_nested(tb, TCA_GACT_MAX, arg);
 221
 222         if (tb[TCA_GACT_PARMS] == NULL) {
 223                 fprintf(f, "[NULL gact parameters]");
 224                 return -1;
 225         }
 226         p = RTA_DATA(tb[TCA_GACT_PARMS]);
 227
 228         fprintf(f, "gact action %s", action_n2a(p->action, b1, sizeof (b1)));
 229 #ifdef CONFIG_GACT_PROB
 230         if (NULL != tb[TCA_GACT_PROB]) {
 231                 pp = RTA_DATA(tb[TCA_GACT_PROB]);
 232         } else {
 233                 /* need to keep consistent output */
 234                 memset(&pp_dummy, 0, sizeof (pp_dummy));
 235                 pp = &pp_dummy;
 236         }
 237         fprintf(f, "\n\t random type %s %s val %d",prob_n2a(pp->ptype), action_n2a(pp->paction, b2, sizeof (b2)), pp->pval);
 238 #endif
 239         fprintf(f, "\n\t index %d ref %d bind %d",p->index, p->refcnt, p->bindcnt);
 240         if (show_stats) {
 241                 if (tb[TCA_GACT_TM]) {
 242                         struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]);
 243                         print_tm(f,tm);
 244                 }
 245         }
 246         fprintf(f, "\n ");
 247         return 0;
 248 }
 249
 250 struct action_util gact_action_util = {
 251         .id = "gact",
 252         .parse_aopt = parse_gact,
 253         .print_aopt = print_gact,
 254 };