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 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 }; 255
