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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21
  22 #include "utils.h"
  23 #include "rt_names.h"
  24 #include "tc_common.h"
  25 #include "tc_util.h"
  26
  27 static void explain(void)
  28 {
  29         fprintf(stderr,
  30                 "Usage: ... route [ from REALM | fromif TAG ] [ to REALM ]\n"
  31                 "                [ classid CLASSID ] [ action ACTION_SPEC ]\n"
  32                 "       ACTION_SPEC := ... look at individual actions\n"
  33                 "       CLASSID := X:Y\n"
  34                 "\n"
  35                 "NOTE: CLASSID is parsed as hexadecimal input.\n");
  36 }
  37
  38 static int route_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
  39 {
  40         struct tcmsg *t = NLMSG_DATA(n);
  41         struct rtattr *tail;
  42         __u32 fh = 0xFFFF8000;
  43         __u32 order = 0;
  44
  45         if (handle) {
  46                 if (get_u32(&t->tcm_handle, handle, 0)) {
  47                         fprintf(stderr, "Illegal \"handle\"\n");
  48                         return -1;
  49                 }
  50         }
  51
  52         if (argc == 0)
  53                 return 0;
  54
  55         tail = addattr_nest(n, 4096, TCA_OPTIONS);
  56
  57         while (argc > 0) {
  58                 if (matches(*argv, "to") == 0) {
  59                         __u32 id;
  60
  61                         NEXT_ARG();
  62                         if (rtnl_rtrealm_a2n(&id, *argv)) {
  63                                 fprintf(stderr, "Illegal \"to\"\n");
  64                                 return -1;
  65                         }
  66                         addattr_l(n, 4096, TCA_ROUTE4_TO, &id, 4);
  67                         fh &= ~0x80FF;
  68                         fh |= id&0xFF;
  69                 } else if (matches(*argv, "from") == 0) {
  70                         __u32 id;
  71
  72                         NEXT_ARG();
  73                         if (rtnl_rtrealm_a2n(&id, *argv)) {
  74                                 fprintf(stderr, "Illegal \"from\"\n");
  75                                 return -1;
  76                         }
  77                         addattr_l(n, 4096, TCA_ROUTE4_FROM, &id, 4);
  78                         fh &= 0xFFFF;
  79                         fh |= id<<16;
  80                 } else if (matches(*argv, "fromif") == 0) {
  81                         __u32 id;
  82
  83                         NEXT_ARG();
  84                         ll_init_map(&rth);
  85                         if ((id = ll_name_to_index(*argv)) <= 0) {
  86                                 fprintf(stderr, "Illegal \"fromif\"\n");
  87                                 return -1;
  88                         }
  89                         addattr_l(n, 4096, TCA_ROUTE4_IIF, &id, 4);
  90                         fh &= 0xFFFF;
  91                         fh |= (0x8000|id)<<16;
  92                 } else if (matches(*argv, "classid") == 0 ||
  93                            strcmp(*argv, "flowid") == 0) {
  94                         unsigned int handle;
  95
  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, "action") == 0) {
 110                         NEXT_ARG();
 111                         if (parse_action(&argc, &argv, TCA_ROUTE4_ACT, n)) {
 112                                 fprintf(stderr, "Illegal \"action\"\n");
 113                                 return -1;
 114                         }
 115                         continue;
 116                 } else if (matches(*argv, "order") == 0) {
 117                         NEXT_ARG();
 118                         if (get_u32(&order, *argv, 0)) {
 119                                 fprintf(stderr, "Illegal \"order\"\n");
 120                                 return -1;
 121                         }
 122                 } else if (strcmp(*argv, "help") == 0) {
 123                         explain();
 124                         return -1;
 125                 } else {
 126                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 127                         explain();
 128                         return -1;
 129                 }
 130                 argc--; argv++;
 131         }
 132         addattr_nest_end(n, tail);
 133         if (order) {
 134                 fh &= ~0x7F00;
 135                 fh |= (order<<8)&0x7F00;
 136         }
 137         if (!t->tcm_handle)
 138                 t->tcm_handle = fh;
 139         return 0;
 140 }
 141
 142 static int route_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
 143 {
 144         struct rtattr *tb[TCA_ROUTE4_MAX+1];
 145
 146         SPRINT_BUF(b1);
 147
 148         if (opt == NULL)
 149                 return 0;
 150
 151         parse_rtattr_nested(tb, TCA_ROUTE4_MAX, opt);
 152
 153         if (handle)
 154                 fprintf(f, "fh 0x%08x ", handle);
 155         if (handle&0x7F00)
 156                 fprintf(f, "order %d ", (handle>>8)&0x7F);
 157
 158         if (tb[TCA_ROUTE4_CLASSID]) {
 159                 SPRINT_BUF(b1);
 160                 fprintf(f, "flowid %s ", sprint_tc_classid(rta_getattr_u32(tb[TCA_ROUTE4_CLASSID]), b1));
 161         }
 162         if (tb[TCA_ROUTE4_TO])
 163                 fprintf(f, "to %s ", rtnl_rtrealm_n2a(rta_getattr_u32(tb[TCA_ROUTE4_TO]), b1, sizeof(b1)));
 164         if (tb[TCA_ROUTE4_FROM])
 165                 fprintf(f, "from %s ", rtnl_rtrealm_n2a(rta_getattr_u32(tb[TCA_ROUTE4_FROM]), b1, sizeof(b1)));
 166         if (tb[TCA_ROUTE4_IIF])
 167                 fprintf(f, "fromif %s", ll_index_to_name(rta_getattr_u32(tb[TCA_ROUTE4_IIF])));
 168         if (tb[TCA_ROUTE4_POLICE])
 169                 tc_print_police(f, tb[TCA_ROUTE4_POLICE]);
 170         if (tb[TCA_ROUTE4_ACT])
 171                 tc_print_action(f, tb[TCA_ROUTE4_ACT], 0);
 172         return 0;
 173 }
 174
 175 struct filter_util route_filter_util = {
 176         .id = "route",
 177         .parse_fopt = route_parse_opt,
 178         .print_fopt = route_print_opt,
 179 };