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 30static 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 42static void 43explain(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 65int 66get_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 86int 87parse_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 195int 196print_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 240struct action_util gact_action_util = { 241 .id = "gact", 242 .parse_aopt = parse_gact, 243 .print_aopt = print_gact, 244}; 245