tc/f_tcindex.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * f_tcindex.c          Traffic control index filter
   4  *
   5  * Written 1998,1999 by Werner Almesberger
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <unistd.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,
  21                 " Usage: ... tcindex    [ hash SIZE ] [ mask MASK ] [ shift SHIFT ]\n"
  22                 "                       [ pass_on | fall_through ]\n"
  23                 "                       [ classid CLASSID ] [ action ACTION_SPEC ]\n");
  24 }
  25
  26 static int tcindex_parse_opt(struct filter_util *qu, char *handle, int argc,
  27                              char **argv, struct nlmsghdr *n)
  28 {
  29         struct tcmsg *t = NLMSG_DATA(n);
  30         struct rtattr *tail;
  31         char *end;
  32
  33         if (handle) {
  34                 t->tcm_handle = strtoul(handle, &end, 0);
  35                 if (*end) {
  36                         fprintf(stderr, "Illegal filter ID\n");
  37                         return -1;
  38                 }
  39         }
  40         if (!argc) return 0;
  41         tail = addattr_nest(n, 4096, TCA_OPTIONS);
  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         addattr_nest_end(n, 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 };