tc/f_route.c

   1 /*
   2  * f_route.c            ROUTE filter.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <string.h>
  22
  23 #include "utils.h"
  24 #include "rt_names.h"
  25 #include "tc_common.h"
  26 #include "tc_util.h"
  27
  28 static void explain(void)
  29 {
  30         fprintf(stderr, "Usage: ... route [ from REALM | fromif TAG ] [ to REALM ]\n");
  31         fprintf(stderr, "                [ flowid CLASSID ] [ police POLICE_SPEC ]\n");
  32         fprintf(stderr, "       POLICE_SPEC := ... look at TBF\n");
  33         fprintf(stderr, "       CLASSID := X:Y\n");
  34 }
  35
  36 #define usage() return(-1)
  37
  38 static int route_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
  39 {
  40         struct tc_police tp;
  41         struct tcmsg *t = NLMSG_DATA(n);
  42         struct rtattr *tail;
  43         __u32 fh = 0xFFFF8000;
  44         __u32 order = 0;
  45
  46         memset(&tp, 0, sizeof(tp));
  47
  48         if (handle) {
  49                 if (get_u32(&t->tcm_handle, handle, 0)) {
  50                         fprintf(stderr, "Illegal \"handle\"\n");
  51                         return -1;
  52                 }
  53         }
  54
  55         if (argc == 0)
  56                 return 0;
  57
  58         tail = NLMSG_TAIL(n);
  59         addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
  60
  61         while (argc > 0) {
  62                 if (matches(*argv, "to") == 0) {
  63                         __u32 id;
  64                         NEXT_ARG();
  65                         if (rtnl_rtrealm_a2n(&id, *argv)) {
  66                                 fprintf(stderr, "Illegal \"to\"\n");
  67                                 return -1;
  68                         }
  69                         addattr_l(n, 4096, TCA_ROUTE4_TO, &id, 4);
  70                         fh &= ~0x80FF;
  71                         fh |= id&0xFF;
  72                 } else if (matches(*argv, "from") == 0) {
  73                         __u32 id;
  74                         NEXT_ARG();
  75                         if (rtnl_rtrealm_a2n(&id, *argv)) {
  76                                 fprintf(stderr, "Illegal \"from\"\n");
  77                                 return -1;
  78                         }
  79                         addattr_l(n, 4096, TCA_ROUTE4_FROM, &id, 4);
  80                         fh &= 0xFFFF;
  81                         fh |= id<<16;
  82                 } else if (matches(*argv, "fromif") == 0) {
  83                         __u32 id;
  84                         NEXT_ARG();
  85                         ll_init_map(&rth);
  86                         if ((id=ll_name_to_index(*argv)) <= 0) {
  87                                 fprintf(stderr, "Illegal \"fromif\"\n");
  88                                 return -1;
  89                         }
  90                         addattr_l(n, 4096, TCA_ROUTE4_IIF, &id, 4);
  91                         fh &= 0xFFFF;
  92                         fh |= (0x8000|id)<<16;
  93                 } else if (matches(*argv, "classid") == 0 ||
  94                            strcmp(*argv, "flowid") == 0) {
  95                         unsigned handle;
  96                         NEXT_ARG();
  97                         if (get_tc_classid(&handle, *argv)) {
  98                                 fprintf(stderr, "Illegal \"classid\"\n");
  99                                 return -1;
 100                         }
 101                         addattr_l(n, 4096, TCA_ROUTE4_CLASSID, &handle, 4);
 102                 } else if (matches(*argv, "police") == 0) {
 103                         NEXT_ARG();
 104                         if (parse_police(&argc, &argv, TCA_ROUTE4_POLICE, n)) {
 105                                 fprintf(stderr, "Illegal \"police\"\n");
 106                                 return -1;
 107                         }
 108                         continue;
 109                 } else if (matches(*argv, "order") == 0) {
 110                         NEXT_ARG();
 111                         if (get_u32(&order, *argv, 0)) {
 112                                 fprintf(stderr, "Illegal \"order\"\n");
 113                                 return -1;
 114                         }
 115                 } else if (strcmp(*argv, "help") == 0) {
 116                         explain();
 117                         return -1;
 118                 } else {
 119                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 120                         explain();
 121                         return -1;
 122                 }
 123                 argc--; argv++;
 124         }
 125         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 126         if (order) {
 127                 fh &= ~0x7F00;
 128                 fh |= (order<<8)&0x7F00;
 129         }
 130         if (!t->tcm_handle)
 131                 t->tcm_handle = fh;
 132         return 0;
 133 }
 134
 135 static int route_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
 136 {
 137         struct rtattr *tb[TCA_ROUTE4_MAX+1];
 138         SPRINT_BUF(b1);
 139
 140         if (opt == NULL)
 141                 return 0;
 142
 143         parse_rtattr_nested(tb, TCA_ROUTE4_MAX, opt);
 144
 145         if (handle)
 146                 fprintf(f, "fh 0x%08x ", handle);
 147         if (handle&0x7F00)
 148                 fprintf(f, "order %d ", (handle>>8)&0x7F);
 149
 150         if (tb[TCA_ROUTE4_CLASSID]) {
 151                 SPRINT_BUF(b1);
 152                 fprintf(f, "flowid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_ROUTE4_CLASSID]), b1));
 153         }
 154         if (tb[TCA_ROUTE4_TO])
 155                 fprintf(f, "to %s ", rtnl_rtrealm_n2a(*(__u32*)RTA_DATA(tb[TCA_ROUTE4_TO]), b1, sizeof(b1)));
 156         if (tb[TCA_ROUTE4_FROM])
 157                 fprintf(f, "from %s ", rtnl_rtrealm_n2a(*(__u32*)RTA_DATA(tb[TCA_ROUTE4_FROM]), b1, sizeof(b1)));
 158         if (tb[TCA_ROUTE4_IIF])
 159                 fprintf(f, "fromif %s", ll_index_to_name(*(int*)RTA_DATA(tb[TCA_ROUTE4_IIF])));
 160         if (tb[TCA_ROUTE4_POLICE])
 161                 tc_print_police(f, tb[TCA_ROUTE4_POLICE]);
 162         return 0;
 163 }
 164
 165 struct filter_util route_filter_util = {
 166         .id = "route",
 167         .parse_fopt = route_parse_opt,
 168         .print_fopt = route_print_opt,
 169 };