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 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 = *(__u16 *) RTA_DATA(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 = *(__u16 *) RTA_DATA(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 };