mpath.c

   1 #include <net/if.h>
   2 #include <errno.h>
   3 #include <string.h>
   4
   5 #include <netlink/genl/genl.h>
   6 #include <netlink/genl/family.h>
   7 #include <netlink/genl/ctrl.h>
   8 #include <netlink/msg.h>
   9 #include <netlink/attr.h>
  10
  11 #include "nl80211.h"
  12 #include "iw.h"
  13
  14 SECTION(mpath);
  15
  16 enum plink_state {
  17         LISTEN,
  18         OPN_SNT,
  19         OPN_RCVD,
  20         CNF_RCVD,
  21         ESTAB,
  22         HOLDING,
  23         BLOCKED
  24 };
  25
  26
  27 static int print_mpath_handler(struct nl_msg *msg, void *arg)
  28 {
  29         struct nlattr *tb[NL80211_ATTR_MAX + 1];
  30         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
  31         struct nlattr *pinfo[NL80211_MPATH_INFO_MAX + 1];
  32         char dst[20], next_hop[20], dev[20];
  33         static struct nla_policy mpath_policy[NL80211_MPATH_INFO_MAX + 1] = {
  34                 [NL80211_MPATH_INFO_FRAME_QLEN] = { .type = NLA_U32 },
  35                 [NL80211_MPATH_INFO_SN] = { .type = NLA_U32 },
  36                 [NL80211_MPATH_INFO_METRIC] = { .type = NLA_U32 },
  37                 [NL80211_MPATH_INFO_EXPTIME] = { .type = NLA_U32 },
  38                 [NL80211_MPATH_INFO_DISCOVERY_TIMEOUT] = { .type = NLA_U32 },
  39                 [NL80211_MPATH_INFO_DISCOVERY_RETRIES] = { .type = NLA_U8 },
  40                 [NL80211_MPATH_INFO_FLAGS] = { .type = NLA_U8 },
  41         };
  42
  43         nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
  44                   genlmsg_attrlen(gnlh, 0), NULL);
  45
  46         /*
  47          * TODO: validate the interface and mac address!
  48          * Otherwise, there's a race condition as soon as
  49          * the kernel starts sending mpath notifications.
  50          */
  51
  52         if (!tb[NL80211_ATTR_MPATH_INFO]) {
  53                 fprintf(stderr, "mpath info missing!\n");
  54                 return NL_SKIP;
  55         }
  56         if (nla_parse_nested(pinfo, NL80211_MPATH_INFO_MAX,
  57                              tb[NL80211_ATTR_MPATH_INFO],
  58                              mpath_policy)) {
  59                 fprintf(stderr, "failed to parse nested attributes!\n");
  60                 return NL_SKIP;
  61         }
  62
  63         mac_addr_n2a(dst, nla_data(tb[NL80211_ATTR_MAC]));
  64         mac_addr_n2a(next_hop, nla_data(tb[NL80211_ATTR_MPATH_NEXT_HOP]));
  65         if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
  66         printf("%s %s %s", dst, next_hop, dev);
  67         if (pinfo[NL80211_MPATH_INFO_SN])
  68                 printf("\t%u",
  69                         nla_get_u32(pinfo[NL80211_MPATH_INFO_SN]));
  70         if (pinfo[NL80211_MPATH_INFO_METRIC])
  71                 printf("\t%u",
  72                         nla_get_u32(pinfo[NL80211_MPATH_INFO_METRIC]));
  73         if (pinfo[NL80211_MPATH_INFO_FRAME_QLEN])
  74                 printf("\t%u",
  75                         nla_get_u32(pinfo[NL80211_MPATH_INFO_FRAME_QLEN]));
  76         if (pinfo[NL80211_MPATH_INFO_EXPTIME])
  77                 printf("\t%u",
  78                         nla_get_u32(pinfo[NL80211_MPATH_INFO_EXPTIME]));
  79         if (pinfo[NL80211_MPATH_INFO_DISCOVERY_TIMEOUT])
  80                 printf("\t%u",
  81                 nla_get_u32(pinfo[NL80211_MPATH_INFO_DISCOVERY_TIMEOUT]));
  82         if (pinfo[NL80211_MPATH_INFO_DISCOVERY_RETRIES])
  83                 printf("\t%u",
  84                 nla_get_u8(pinfo[NL80211_MPATH_INFO_DISCOVERY_RETRIES]));
  85         if (pinfo[NL80211_MPATH_INFO_FLAGS])
  86                 printf("\t0x%x",
  87                         nla_get_u8(pinfo[NL80211_MPATH_INFO_FLAGS]));
  88
  89         printf("\n");
  90         return NL_SKIP;
  91 }
  92
  93 static int handle_mpath_get(struct nl80211_state *state,
  94                             struct nl_msg *msg,
  95                             int argc, char **argv,
  96                             enum id_input id)
  97 {
  98         unsigned char dst[ETH_ALEN];
  99
 100         if (argc < 1)
 101                 return 1;
 102
 103         if (mac_addr_a2n(dst, argv[0])) {
 104                 fprintf(stderr, "invalid mac address\n");
 105                 return 2;
 106         }
 107         argc--;
 108         argv++;
 109
 110         if (argc)
 111                 return 1;
 112
 113         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, dst);
 114
 115         register_handler(print_mpath_handler, NULL);
 116
 117         return 0;
 118  nla_put_failure:
 119         return -ENOBUFS;
 120 }
 121 COMMAND(mpath, get, "<MAC address>",
 122         NL80211_CMD_GET_MPATH, 0, CIB_NETDEV, handle_mpath_get,
 123         "Get information on mesh path to the given node.");
 124 COMMAND(mpath, del, "<MAC address>",
 125         NL80211_CMD_DEL_MPATH, 0, CIB_NETDEV, handle_mpath_get,
 126         "Remove the mesh path to the given node.");
 127
 128 static int handle_mpath_set(struct nl80211_state *state,
 129                             struct nl_msg *msg,
 130                             int argc, char **argv,
 131                             enum id_input id)
 132 {
 133         unsigned char dst[ETH_ALEN];
 134         unsigned char next_hop[ETH_ALEN];
 135
 136         if (argc < 3)
 137                 return 1;
 138
 139         if (mac_addr_a2n(dst, argv[0])) {
 140                 fprintf(stderr, "invalid destination mac address\n");
 141                 return 2;
 142         }
 143         argc--;
 144         argv++;
 145
 146         if (strcmp("next_hop", argv[0]) != 0)
 147                 return 1;
 148         argc--;
 149         argv++;
 150
 151         if (mac_addr_a2n(next_hop, argv[0])) {
 152                 fprintf(stderr, "invalid next hop mac address\n");
 153                 return 2;
 154         }
 155         argc--;
 156         argv++;
 157
 158         if (argc)
 159                 return 1;
 160
 161         NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, dst);
 162         NLA_PUT(msg, NL80211_ATTR_MPATH_NEXT_HOP, ETH_ALEN, next_hop);
 163
 164         register_handler(print_mpath_handler, NULL);
 165         return 0;
 166  nla_put_failure:
 167         return -ENOBUFS;
 168 }
 169 COMMAND(mpath, new, "<destination MAC address> next_hop <next hop MAC address>",
 170         NL80211_CMD_NEW_MPATH, 0, CIB_NETDEV, handle_mpath_set,
 171         "Create a new mesh path (instead of relying on automatic discovery).");
 172 COMMAND(mpath, set, "<destination MAC address> next_hop <next hop MAC address>",
 173         NL80211_CMD_SET_MPATH, 0, CIB_NETDEV, handle_mpath_set,
 174         "Set an existing mesh path's next hop.");
 175
 176 static int handle_mpath_dump(struct nl80211_state *state,
 177                              struct nl_msg *msg,
 178                              int argc, char **argv,
 179                              enum id_input id)
 180 {
 181         printf("DEST ADDR         NEXT HOP          IFACE\tSN\tMETRIC\tQLEN\t"
 182                "EXPTIME\t\tDTIM\tDRET\tFLAGS\n");
 183         register_handler(print_mpath_handler, NULL);
 184         return 0;
 185 }
 186 COMMAND(mpath, dump, NULL,
 187         NL80211_CMD_GET_MPATH, NLM_F_DUMP, CIB_NETDEV, handle_mpath_dump,
 188         "List known mesh paths.");