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 ]" 21 " [ shift SHIFT ]\n"); 22 fprintf(stderr," [ pass_on | fall_through ]\n"); 23 fprintf(stderr," [ classid CLASSID ] " 24 "[ police POLICE_SPEC ]\n"); 25 } 26 27 static int tcindex_parse_opt(struct filter_util *qu, char *handle, int argc, 28 char **argv, struct nlmsghdr *n) 29 { 30 struct tcmsg *t = NLMSG_DATA(n); 31 struct rtattr *tail; 32 char *end; 33 34 if (handle) { 35 t->tcm_handle = strtoul(handle,&end,0); 36 if (*end) { 37 fprintf(stderr, "Illegal filter ID\n"); 38 return -1; 39 } 40 } 41 if (!argc) return 0; 42 tail = NLMSG_TAIL(n); 43 addattr_l(n,4096,TCA_OPTIONS,NULL,0); 44 while (argc) { 45 if (!strcmp(*argv,"hash")) { 46 int hash; 47 48 NEXT_ARG(); 49 hash = strtoul(*argv,&end,0); 50 if (*end || !hash || hash > 0x10000) { 51 explain(); 52 return -1; 53 } 54 addattr_l(n,4096,TCA_TCINDEX_HASH,&hash,sizeof(hash)); 55 } 56 else if (!strcmp(*argv,"mask")) { 57 __u16 mask; 58 59 NEXT_ARG(); 60 mask = strtoul(*argv,&end,0); 61 if (*end) { 62 explain(); 63 return -1; 64 } 65 addattr_l(n,4096,TCA_TCINDEX_MASK,&mask,sizeof(mask)); 66 } 67 else if (!strcmp(*argv,"shift")) { 68 int shift; 69 70 NEXT_ARG(); 71 shift = strtoul(*argv,&end,0); 72 if (*end) { 73 explain(); 74 return -1; 75 } 76 addattr_l(n,4096,TCA_TCINDEX_SHIFT,&shift, 77 sizeof(shift)); 78 } 79 else if (!strcmp(*argv,"fall_through")) { 80 int value = 1; 81 82 addattr_l(n,4096,TCA_TCINDEX_FALL_THROUGH,&value, 83 sizeof(value)); 84 } 85 else if (!strcmp(*argv,"pass_on")) { 86 int value = 0; 87 88 addattr_l(n,4096,TCA_TCINDEX_FALL_THROUGH,&value, 89 sizeof(value)); 90 } 91 else if (!strcmp(*argv,"classid")) { 92 __u32 handle; 93 94 NEXT_ARG(); 95 if (get_tc_classid(&handle,*argv)) { 96 fprintf(stderr, "Illegal \"classid\"\n"); 97 return -1; 98 } 99 addattr_l(n, 4096, TCA_TCINDEX_CLASSID, &handle, 4); 100 } 101 else if (!strcmp(*argv,"police")) { 102 NEXT_ARG(); 103 if (parse_police(&argc, &argv, TCA_TCINDEX_POLICE, n)) { 104 fprintf(stderr, "Illegal \"police\"\n"); 105 return -1; 106 } 107 continue; 108 } 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 = *(int *) RTA_DATA(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 = *(int *) RTA_DATA(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 return 0; 175 } 176 177 struct filter_util tcindex_filter_util = { 178 .id = "tcindex", 179 .parse_fopt = tcindex_parse_opt, 180 .print_fopt = tcindex_print_opt, 181 }; 182
