ip/ipnetconf.c

   1 /*
   2  * ipnetconf.c          "ip netconf".
   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:     Nicolas Dichtel, <nicolas.dichtel@6wind.com>
  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 <string.h>
  19 #include <sys/time.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22
  23 #include "rt_names.h"
  24 #include "utils.h"
  25 #include "ip_common.h"
  26
  27 static struct {
  28         int family;
  29         int ifindex;
  30 } filter;
  31
  32 static void usage(void) __attribute__((noreturn));
  33
  34 static void usage(void)
  35 {
  36         fprintf(stderr, "Usage: ip netconf show [ dev STRING ]\n");
  37         exit(-1);
  38 }
  39
  40 static void print_onoff(FILE *f, const char *flag, __u32 val)
  41 {
  42         fprintf(f, "%s %s ", flag, val ? "on" : "off");
  43 }
  44
  45 static struct rtattr *netconf_rta(struct netconfmsg *ncm)
  46 {
  47         return (struct rtattr *)((char *)ncm
  48                                  + NLMSG_ALIGN(sizeof(struct netconfmsg)));
  49 }
  50
  51 int print_netconf(const struct sockaddr_nl *who, struct rtnl_ctrl_data *ctrl,
  52                   struct nlmsghdr *n, void *arg)
  53 {
  54         FILE *fp = (FILE *)arg;
  55         struct netconfmsg *ncm = NLMSG_DATA(n);
  56         int len = n->nlmsg_len;
  57         struct rtattr *tb[NETCONFA_MAX+1];
  58
  59         if (n->nlmsg_type == NLMSG_ERROR)
  60                 return -1;
  61         if (n->nlmsg_type != RTM_NEWNETCONF) {
  62                 fprintf(stderr, "Not RTM_NEWNETCONF: %08x %08x %08x\n",
  63                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  64
  65                 return -1;
  66         }
  67         len -= NLMSG_SPACE(sizeof(*ncm));
  68         if (len < 0) {
  69                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
  70                 return -1;
  71         }
  72
  73         if (filter.family && filter.family != ncm->ncm_family)
  74                 return 0;
  75
  76         parse_rtattr(tb, NETCONFA_MAX, netconf_rta(ncm),
  77                      NLMSG_PAYLOAD(n, sizeof(*ncm)));
  78
  79         switch (ncm->ncm_family) {
  80         case AF_INET:
  81                 fprintf(fp, "ipv4 ");
  82                 break;
  83         case AF_INET6:
  84                 fprintf(fp, "ipv6 ");
  85                 break;
  86         case AF_MPLS:
  87                 fprintf(fp, "mpls ");
  88                 break;
  89         default:
  90                 fprintf(fp, "unknown ");
  91                 break;
  92         }
  93
  94         if (tb[NETCONFA_IFINDEX]) {
  95                 int *ifindex = (int *)rta_getattr_str(tb[NETCONFA_IFINDEX]);
  96
  97                 switch (*ifindex) {
  98                 case NETCONFA_IFINDEX_ALL:
  99                         fprintf(fp, "all ");
 100                         break;
 101                 case NETCONFA_IFINDEX_DEFAULT:
 102                         fprintf(fp, "default ");
 103                         break;
 104                 default:
 105                         fprintf(fp, "dev %s ", ll_index_to_name(*ifindex));
 106                         break;
 107                 }
 108         }
 109
 110         if (tb[NETCONFA_FORWARDING])
 111                 print_onoff(fp, "forwarding",
 112                                 rta_getattr_u32(tb[NETCONFA_FORWARDING]));
 113         if (tb[NETCONFA_RP_FILTER]) {
 114                 __u32 rp_filter = rta_getattr_u32(tb[NETCONFA_RP_FILTER]);
 115
 116                 if (rp_filter == 0)
 117                         fprintf(fp, "rp_filter off ");
 118                 else if (rp_filter == 1)
 119                         fprintf(fp, "rp_filter strict ");
 120                 else if (rp_filter == 2)
 121                         fprintf(fp, "rp_filter loose ");
 122                 else
 123                         fprintf(fp, "rp_filter unknown mode ");
 124         }
 125         if (tb[NETCONFA_MC_FORWARDING])
 126                 print_onoff(fp, "mc_forwarding",
 127                                 rta_getattr_u32(tb[NETCONFA_MC_FORWARDING]));
 128
 129         if (tb[NETCONFA_PROXY_NEIGH])
 130                 print_onoff(fp, "proxy_neigh",
 131                                 rta_getattr_u32(tb[NETCONFA_PROXY_NEIGH]));
 132
 133         if (tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN])
 134                 print_onoff(fp, "ignore_routes_with_linkdown",
 135                      rta_getattr_u32(tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]));
 136
 137         if (tb[NETCONFA_INPUT])
 138                 print_onoff(fp, "input", rta_getattr_u32(tb[NETCONFA_INPUT]));
 139
 140         fprintf(fp, "\n");
 141         fflush(fp);
 142         return 0;
 143 }
 144
 145 static int print_netconf2(const struct sockaddr_nl *who,
 146                           struct nlmsghdr *n, void *arg)
 147 {
 148         return print_netconf(who, NULL, n, arg);
 149 }
 150
 151 void ipnetconf_reset_filter(int ifindex)
 152 {
 153         memset(&filter, 0, sizeof(filter));
 154         filter.ifindex = ifindex;
 155 }
 156
 157 static int do_show(int argc, char **argv)
 158 {
 159         struct {
 160                 struct nlmsghdr         n;
 161                 struct netconfmsg       ncm;
 162                 char                    buf[1024];
 163         } req = {
 164                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct netconfmsg)),
 165                 .n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
 166                 .n.nlmsg_type = RTM_GETNETCONF,
 167         };
 168
 169         ipnetconf_reset_filter(0);
 170         filter.family = preferred_family;
 171         if (filter.family == AF_UNSPEC)
 172                 filter.family = AF_INET;
 173
 174         while (argc > 0) {
 175                 if (strcmp(*argv, "dev") == 0) {
 176                         NEXT_ARG();
 177                         filter.ifindex = ll_name_to_index(*argv);
 178                         if (filter.ifindex <= 0) {
 179                                 fprintf(stderr, "Device \"%s\" does not exist.\n",
 180                                         *argv);
 181                                 return -1;
 182                         }
 183                 }
 184                 argv++; argc--;
 185         }
 186
 187         ll_init_map(&rth);
 188         if (filter.ifindex) {
 189                 req.ncm.ncm_family = filter.family;
 190                 if (filter.ifindex)
 191                         addattr_l(&req.n, sizeof(req), NETCONFA_IFINDEX,
 192                                   &filter.ifindex, sizeof(filter.ifindex));
 193
 194                 if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) {
 195                         perror("Can not send request");
 196                         exit(1);
 197                 }
 198                 rtnl_listen(&rth, print_netconf, stdout);
 199         } else {
 200 dump:
 201                 if (rtnl_wilddump_request(&rth, filter.family, RTM_GETNETCONF) < 0) {
 202                         perror("Cannot send dump request");
 203                         exit(1);
 204                 }
 205                 if (rtnl_dump_filter(&rth, print_netconf2, stdout) < 0) {
 206                         fprintf(stderr, "Dump terminated\n");
 207                         exit(1);
 208                 }
 209                 if (preferred_family == AF_UNSPEC) {
 210                         preferred_family = AF_INET6;
 211                         filter.family = AF_INET6;
 212                         goto dump;
 213                 }
 214         }
 215         return 0;
 216 }
 217
 218 int do_ipnetconf(int argc, char **argv)
 219 {
 220         if (argc > 0) {
 221                 if (matches(*argv, "show") == 0 ||
 222                     matches(*argv, "lst") == 0 ||
 223                     matches(*argv, "list") == 0)
 224                         return do_show(argc-1, argv+1);
 225                 if (matches(*argv, "help") == 0)
 226                         usage();
 227         } else
 228                 return do_show(0, NULL);
 229
 230         fprintf(stderr, "Command \"%s\" is unknown, try \"ip netconf help\".\n", *argv);
 231         exit(-1);
 232 }