1 /* 2 * f_tcindex.c Traffic control index filter 3 * 4 * Written 1998,1999 by Werner Almesberger 5 */ 6 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <unistd.h> 10 #include <syslog.h> 11 #include <fcntl.h> 12 #include <string.h> 13 #include <netinet/in.h> 14 15 #include "utils.h" 16 #include "tc_util.h" 17 18 static void explain(void) 19 { 20 fprintf(stderr," Usage: ... tcindex [ hash SIZE ] [ mask MASK ] [ shift SHIFT ]\n"); 21 fprintf(stderr, " [ pass_on | fall_through ]\n"); 22 fprintf(stderr," [ classid CLASSID ] [ action ACTION_SPEC ]\n"); 23 } 24 25 static int tcindex_parse_opt(struct filter_util *qu, char *handle, int argc, 26 char **argv, struct nlmsghdr *n) 27 { 28 struct tcmsg *t = NLMSG_DATA(n); 29 struct rtattr *tail; 30 char *end; 31 32 if (handle) { 33 t->tcm_handle = strtoul(handle, &end, 0); 34 if (*end) { 35 fprintf(stderr, "Illegal filter ID\n"); 36 return -1; 37 } 38 } 39 if (!argc) return 0; 40 tail = NLMSG_TAIL(n); 41 addattr_l(n, 4096, TCA_OPTIONS, NULL, 0); 42 while (argc) { 43 if (!strcmp(*argv, "hash")) { 44 int hash; 45 46 NEXT_ARG(); 47 hash = strtoul(*argv, &end, 0); 48 if (*end || !hash || hash > 0x10000) { 49 explain(); 50 return -1; 51 } 52 addattr_l(n, 4096, TCA_TCINDEX_HASH, &hash, 53 sizeof(hash)); 54 } else if (!strcmp(*argv,"mask")) { 55 __u16 mask; 56 57 NEXT_ARG(); 58 mask = strtoul(*argv, &end, 0); 59 if (*end) { 60 explain(); 61 return -1; 62 } 63 addattr_l(n, 4096, TCA_TCINDEX_MASK, &mask, 64 sizeof(mask)); 65 } else if (!strcmp(*argv,"shift")) { 66 int shift; 67 68 NEXT_ARG(); 69 shift = strtoul(*argv, &end, 0); 70 if (*end) { 71 explain(); 72 return -1; 73 } 74 addattr_l(n, 4096, TCA_TCINDEX_SHIFT, &shift, 75 sizeof(shift)); 76 } else if (!strcmp(*argv,"fall_through")) { 77 int value = 1; 78 79 addattr_l(n, 4096, TCA_TCINDEX_FALL_THROUGH, &value, 80 sizeof(value)); 81 } else if (!strcmp(*argv,"pass_on")) { 82 int value = 0; 83 84 addattr_l(n, 4096, TCA_TCINDEX_FALL_THROUGH, &value, 85 sizeof(value)); 86 } else if (!strcmp(*argv,"classid")) { 87 __u32 handle; 88 89 NEXT_ARG(); 90 if (get_tc_classid(&handle, *argv)) { 91 fprintf(stderr, "Illegal \"classid\"\n"); 92 return -1; 93 } 94 addattr_l(n, 4096, TCA_TCINDEX_CLASSID, &handle, 4); 95 } else if (!strcmp(*argv,"police")) { 96 NEXT_ARG(); 97 if (parse_police(&argc, &argv, TCA_TCINDEX_POLICE, n)) { 98 fprintf(stderr, "Illegal \"police\"\n"); 99 return -1; 100 } 101 continue; 102 } else if (!strcmp(*argv,"action")) { 103 NEXT_ARG(); 104 if (parse_action(&argc, &argv, TCA_TCINDEX_ACT, n)) { 105 fprintf(stderr, "Illegal \"action\"\n"); 106 return -1; 107 } 108 continue; 109 } else { 110 explain(); 111 return -1; 112 } 113 argc--; 114 argv++; 115 } 116 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; 117 return 0; 118 } 119 120 121 static int tcindex_print_opt(struct filter_util *qu, FILE *f, 122 struct rtattr *opt, __u32 handle) 123 { 124 struct rtattr *tb[TCA_TCINDEX_MAX+1]; 125 126 if (opt == NULL) 127 return 0; 128 129 parse_rtattr_nested(tb, TCA_TCINDEX_MAX, opt); 130 131 if (handle != ~0) fprintf(f, "handle 0x%04x ", handle); 132 if (tb[TCA_TCINDEX_HASH]) { 133 __u16 hash; 134 135 if (RTA_PAYLOAD(tb[TCA_TCINDEX_HASH]) < sizeof(hash)) 136 return -1; 137 hash = rta_getattr_u16(tb[TCA_TCINDEX_HASH]); 138 fprintf(f, "hash %d ", hash); 139 } 140 if (tb[TCA_TCINDEX_MASK]) { 141 __u16 mask; 142 143 if (RTA_PAYLOAD(tb[TCA_TCINDEX_MASK]) < sizeof(mask)) 144 return -1; 145 mask = rta_getattr_u16(tb[TCA_TCINDEX_MASK]); 146 fprintf(f, "mask 0x%04x ", mask); 147 } 148 if (tb[TCA_TCINDEX_SHIFT]) { 149 int shift; 150 151 if (RTA_PAYLOAD(tb[TCA_TCINDEX_SHIFT]) < sizeof(shift)) 152 return -1; 153 shift = rta_getattr_u32(tb[TCA_TCINDEX_SHIFT]); 154 fprintf(f, "shift %d ", shift); 155 } 156 if (tb[TCA_TCINDEX_FALL_THROUGH]) { 157 int fall_through; 158 159 if (RTA_PAYLOAD(tb[TCA_TCINDEX_FALL_THROUGH]) < 160 sizeof(fall_through)) 161 return -1; 162 fall_through = rta_getattr_u32(tb[TCA_TCINDEX_FALL_THROUGH]); 163 fprintf(f, fall_through ? "fall_through " : "pass_on "); 164 } 165 if (tb[TCA_TCINDEX_CLASSID]) { 166 SPRINT_BUF(b1); 167 fprintf(f, "classid %s ", sprint_tc_classid(*(__u32 *) 168 RTA_DATA(tb[TCA_TCINDEX_CLASSID]), b1)); 169 } 170 if (tb[TCA_TCINDEX_POLICE]) { 171 fprintf(f, "\n"); 172 tc_print_police(f, tb[TCA_TCINDEX_POLICE]); 173 } 174 if (tb[TCA_TCINDEX_ACT]) { 175 fprintf(f, "\n"); 176 tc_print_action(f, tb[TCA_TCINDEX_ACT], 0); 177 } 178 return 0; 179 } 180 181 struct filter_util tcindex_filter_util = { 182 .id = "tcindex", 183 .parse_fopt = tcindex_parse_opt, 184 .print_fopt = tcindex_print_opt, 185 }; 186
