mpp.c

   1 #include <net/if.h>
   2 #include <errno.h>
   3
   4 #include <netlink/genl/genl.h>
   5 #include <netlink/genl/family.h>
   6 #include <netlink/genl/ctrl.h>
   7 #include <netlink/msg.h>
   8 #include <netlink/attr.h>
   9
  10 #include "nl80211.h"
  11 #include "iw.h"
  12
  13 SECTION(mpp);
  14
  15 static int print_mpp_handler(struct nl_msg *msg, void *arg)
  16 {
  17         struct nlattr *tb[NL80211_ATTR_MAX + 1];
  18         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
  19         char dst[20], next_hop[20], dev[20];
  20
  21         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
  22                   genlmsg_attrlen(gnlh, 0), NULL);
  23
  24         /*
  25          * TODO: validate the interface and mac address!
  26          * Otherwise, there's a race condition as soon as
  27          * the kernel starts sending mpath notifications.
  28          */
  29
  30         mac_addr_n2a(dst, nla_data(tb[NL80211_ATTR_MAC]));
  31         mac_addr_n2a(next_hop, nla_data(tb[NL80211_ATTR_MPATH_NEXT_HOP]));
  32         if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
  33         printf("%s %s %s\n", dst, next_hop, dev);
  34
  35         return NL_SKIP;
  36 }
  37
  38 static int handle_mpp_get(struct nl80211_state *state,
  39                           struct nl_msg *msg,
  40                           int argc, char **argv,
  41                           enum id_input id)
  42 {
  43         unsigned char dst[ETH_ALEN];
  44
  45         if (argc < 1)
  46                 return 1;
  47
  48         if (mac_addr_a2n(dst, argv[0])) {
  49                 fprintf(stderr, "invalid mac address\n");
  50                 return 2;
  51         }
  52         argc--;
  53         argv++;
  54
  55         if (argc)
  56                 return 1;
  57
  58         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, dst);
  59
  60         register_handler(print_mpp_handler, NULL);
  61
  62         return 0;
  63  nla_put_failure:
  64         return -ENOBUFS;
  65 }
  66 COMMAND(mpp, get, "<MAC address>",
  67         NL80211_CMD_GET_MPP, 0, CIB_NETDEV, handle_mpp_get,
  68         "Get information on mesh proxy path to the given node.");
  69
  70 static int handle_mpp_dump(struct nl80211_state *state,
  71                              struct nl_msg *msg,
  72                              int argc, char **argv,
  73                              enum id_input id)
  74 {
  75         printf("DEST ADDR         PROXY NODE        IFACE\n");
  76         register_handler(print_mpp_handler, NULL);
  77         return 0;
  78 }
  79 COMMAND(mpp, dump, NULL,
  80         NL80211_CMD_GET_MPP, NLM_F_DUMP, CIB_NETDEV, handle_mpp_dump,
  81         "List known mesh proxy paths.");