tc/f_tcindex.c

   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
  28 #define usage() return(-1)
  29
  30
  31 static int tcindex_parse_opt(struct filter_util *qu, char *handle, int argc,
  32     char **argv, struct nlmsghdr *n)
  33 {
  34         struct tcmsg *t = NLMSG_DATA(n);
  35         struct rtattr *tail;
  36         char *end;
  37
  38         if (handle) {
  39                 t->tcm_handle = strtoul(handle,&end,0);
  40                 if (*end) {
  41                         fprintf(stderr, "Illegal filter ID\n");
  42                         return -1;
  43                 }
  44         }
  45         if (!argc) return 0;
  46         tail = NLMSG_TAIL(n);
  47         addattr_l(n,4096,TCA_OPTIONS,NULL,0);
  48         while (argc) {
  49                 if (!strcmp(*argv,"hash")) {
  50                         int hash;
  51
  52                         NEXT_ARG();
  53                         hash = strtoul(*argv,&end,0);
  54                         if (*end || !hash || hash > 0x10000) {
  55                                 explain();
  56                                 return -1;
  57                         }
  58                         addattr_l(n,4096,TCA_TCINDEX_HASH,&hash,sizeof(hash));
  59                 }
  60                 else if (!strcmp(*argv,"mask")) {
  61                         __u16 mask;
  62
  63                         NEXT_ARG();
  64                         mask = strtoul(*argv,&end,0);
  65                         if (*end) {
  66                                 explain();
  67                                 return -1;
  68                         }
  69                         addattr_l(n,4096,TCA_TCINDEX_MASK,&mask,sizeof(mask));
  70                 }
  71                 else if (!strcmp(*argv,"shift")) {
  72                         int shift;
  73
  74                         NEXT_ARG();
  75                         shift = strtoul(*argv,&end,0);
  76                         if (*end) {
  77                                 explain();
  78                                 return -1;
  79                         }
  80                         addattr_l(n,4096,TCA_TCINDEX_SHIFT,&shift,
  81                             sizeof(shift));
  82                 }
  83                 else if (!strcmp(*argv,"fall_through")) {
  84                         int value = 1;
  85
  86                         addattr_l(n,4096,TCA_TCINDEX_FALL_THROUGH,&value,
  87                             sizeof(value));
  88                 }
  89                 else if (!strcmp(*argv,"pass_on")) {
  90                         int value = 0;
  91
  92                         addattr_l(n,4096,TCA_TCINDEX_FALL_THROUGH,&value,
  93                             sizeof(value));
  94                 }
  95                 else if (!strcmp(*argv,"classid")) {
  96                         __u32 handle;
  97
  98                         NEXT_ARG();
  99                         if (get_tc_classid(&handle,*argv)) {
 100                                 fprintf(stderr, "Illegal \"classid\"\n");
 101                                 return -1;
 102                         }
 103                         addattr_l(n, 4096, TCA_TCINDEX_CLASSID, &handle, 4);
 104                 }
 105                 else if (!strcmp(*argv,"police")) {
 106                         NEXT_ARG();
 107                         if (parse_police(&argc, &argv, TCA_TCINDEX_POLICE, n)) {
 108                                 fprintf(stderr, "Illegal \"police\"\n");
 109                                 return -1;
 110                         }
 111                         continue;
 112                 }
 113                 else {
 114                         explain();
 115                         return -1;
 116                 }
 117                 argc--;
 118                 argv++;
 119         }
 120         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 121         return 0;
 122 }
 123
 124
 125 static int tcindex_print_opt(struct filter_util *qu, FILE *f,
 126      struct rtattr *opt, __u32 handle)
 127 {
 128         struct rtattr *tb[TCA_TCINDEX_MAX+1];
 129
 130         if (opt == NULL)
 131                 return 0;
 132
 133         parse_rtattr_nested(tb, TCA_TCINDEX_MAX, opt);
 134
 135         if (handle != ~0) fprintf(f,"handle 0x%04x ",handle);
 136         if (tb[TCA_TCINDEX_HASH]) {
 137                 __u16 hash;
 138
 139                 if (RTA_PAYLOAD(tb[TCA_TCINDEX_HASH]) < sizeof(hash))
 140                         return -1;
 141                 hash = *(__u16 *) RTA_DATA(tb[TCA_TCINDEX_HASH]);
 142                 fprintf(f,"hash %d ",hash);
 143         }
 144         if (tb[TCA_TCINDEX_MASK]) {
 145                 __u16 mask;
 146
 147                 if (RTA_PAYLOAD(tb[TCA_TCINDEX_MASK]) < sizeof(mask))
 148                         return -1;
 149                 mask = *(__u16 *) RTA_DATA(tb[TCA_TCINDEX_MASK]);
 150                 fprintf(f,"mask 0x%04x ",mask);
 151         }
 152         if (tb[TCA_TCINDEX_SHIFT]) {
 153                 int shift;
 154
 155                 if (RTA_PAYLOAD(tb[TCA_TCINDEX_SHIFT]) < sizeof(shift))
 156                         return -1;
 157                 shift = *(int *) RTA_DATA(tb[TCA_TCINDEX_SHIFT]);
 158                 fprintf(f,"shift %d ",shift);
 159         }
 160         if (tb[TCA_TCINDEX_FALL_THROUGH]) {
 161                 int fall_through;
 162
 163                 if (RTA_PAYLOAD(tb[TCA_TCINDEX_FALL_THROUGH]) <
 164                     sizeof(fall_through))
 165                         return -1;
 166                 fall_through = *(int *) RTA_DATA(tb[TCA_TCINDEX_FALL_THROUGH]);
 167                 fprintf(f,fall_through ? "fall_through " : "pass_on ");
 168         }
 169         if (tb[TCA_TCINDEX_CLASSID]) {
 170                 SPRINT_BUF(b1);
 171                 fprintf(f, "classid %s ",sprint_tc_classid(*(__u32 *)
 172                     RTA_DATA(tb[TCA_TCINDEX_CLASSID]), b1));
 173         }
 174         if (tb[TCA_TCINDEX_POLICE]) {
 175                 fprintf(f, "\n");
 176                 tc_print_police(f, tb[TCA_TCINDEX_POLICE]);
 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 };