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 (at) 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 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 static int 93 parse_gact(struct action_util *a, int *argc_p, char ***argv_p, 94 int tca_id, struct nlmsghdr *n) 95 { 96 int argc = *argc_p; 97 char **argv = *argv_p; 98 int ok = 0; 99 int action = TC_POLICE_RECLASSIFY; 100 struct tc_gact p; 101 #ifdef CONFIG_GACT_PROB 102 int rd = 0; 103 struct tc_gact_p pp; 104 #endif 105 struct rtattr *tail; 106 107 memset(&p, 0, sizeof (p)); 108 p.action = TC_POLICE_RECLASSIFY; 109 110 if (argc < 0) 111 return -1; 112 113 114 if (matches(*argv, "gact") == 0) { 115 ok++; 116 } else { 117 action = get_act(&argv); 118 if (action != -10) { 119 p.action = action; 120 ok++; 121 } else { 122 explain(); 123 return action; 124 } 125 } 126 127 if (ok) { 128 argc--; 129 argv++; 130 } 131 132 #ifdef CONFIG_GACT_PROB 133 if (ok && argc > 0) { 134 if (matches(*argv, "random") == 0) { 135 rd = 1; 136 NEXT_ARG(); 137 if (matches(*argv, "netrand") == 0) { 138 NEXT_ARG(); 139 pp.ptype = PGACT_NETRAND; 140 } else if (matches(*argv, "determ") == 0) { 141 NEXT_ARG(); 142 pp.ptype = PGACT_DETERM; 143 } else { 144 fprintf(stderr, "Illegal \"random type\"\n"); 145 return -1; 146 } 147 148 action = get_act(&argv); 149 if (action != -10) { /* FIXME */ 150 pp.paction = action; 151 } else { 152 explain(); 153 return -1; 154 } 155 argc--; 156 argv++; 157 if (get_u16(&pp.pval, *argv, 10)) { 158 fprintf(stderr, "Illegal probability val 0x%x\n",pp.pval); 159 return -1; 160 } 161 if (pp.pval > 10000) { 162 fprintf(stderr, "Illegal probability val 0x%x\n",pp.pval); 163 return -1; 164 } 165 argc--; 166 argv++; 167 } else if (matches(*argv, "help") == 0) { 168 usage(); 169 } 170 } 171 #endif 172 173 if (argc > 0) { 174 if (matches(*argv, "index") == 0) { 175 NEXT_ARG(); 176 if (get_u32(&p.index, *argv, 10)) { 177 fprintf(stderr, "Illegal \"index\"\n"); 178 return -1; 179 } 180 argc--; 181 argv++; 182 ok++; 183 } else if (matches(*argv, "help") == 0) { 184 usage(); 185 } 186 } 187 188 if (!ok) 189 return -1; 190 191 tail = NLMSG_TAIL(n); 192 addattr_l(n, MAX_MSG, tca_id, NULL, 0); 193 addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof (p)); 194 #ifdef CONFIG_GACT_PROB 195 if (rd) { 196 addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof (pp)); 197 } 198 #endif 199 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; 200 201 *argc_p = argc; 202 *argv_p = argv; 203 return 0; 204 } 205 206 static int 207 print_gact(struct action_util *au,FILE * f, struct rtattr *arg) 208 { 209 SPRINT_BUF(b1); 210 #ifdef CONFIG_GACT_PROB 211 SPRINT_BUF(b2); 212 struct tc_gact_p *pp = NULL; 213 struct tc_gact_p pp_dummy; 214 #endif 215 struct tc_gact *p = NULL; 216 struct rtattr *tb[TCA_GACT_MAX + 1]; 217 218 if (arg == NULL) 219 return -1; 220 221 parse_rtattr_nested(tb, TCA_GACT_MAX, arg); 222 223 if (tb[TCA_GACT_PARMS] == NULL) { 224 fprintf(f, "[NULL gact parameters]"); 225 return -1; 226 } 227 p = RTA_DATA(tb[TCA_GACT_PARMS]); 228 229 fprintf(f, "gact action %s", action_n2a(p->action, b1, sizeof (b1))); 230 #ifdef CONFIG_GACT_PROB 231 if (NULL != tb[TCA_GACT_PROB]) { 232 pp = RTA_DATA(tb[TCA_GACT_PROB]); 233 } else { 234 /* need to keep consistent output */ 235 memset(&pp_dummy, 0, sizeof (pp_dummy)); 236 pp = &pp_dummy; 237 } 238 fprintf(f, "\n\t random type %s %s val %d",prob_n2a(pp->ptype), action_n2a(pp->paction, b2, sizeof (b2)), pp->pval); 239 #endif 240 fprintf(f, "\n\t index %d ref %d bind %d",p->index, p->refcnt, p->bindcnt); 241 if (show_stats) { 242 if (tb[TCA_GACT_TM]) { 243 struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]); 244 print_tm(f,tm); 245 } 246 } 247 fprintf(f, "\n "); 248 return 0; 249 } 250 251 struct action_util gact_action_util = { 252 .id = "gact", 253 .parse_aopt = parse_gact, 254 .print_aopt = print_gact, 255 }; 256
