static int parse_v4_neighbor(
orc_options_t * options,
struct nlmsghdr * nl_msg,
orc_v4_neighbor_t * neigh)
{
struct ndmsg * nd_msg;
struct rtattr * attr;
int rtattr_len;
int found_l3_addr = 0;
nd_msg = (struct ndmsg *) NLMSG_DATA(nl_msg);
/* extract first attribute */
attr = (struct rtattr *) NDA_RTA(nd_msg);
rtattr_len = NDA_PAYLOAD(nl_msg);
if (nd_msg->ndm_family != AF_INET)
{
/* TODO: add IPv6 support */
orc_debug("Ignoring IPv6 neighbor update: IPv6 unsupported\n");
return 0;
}
neigh->if_index = nd_msg->ndm_ifindex;
/** TODO: ignore neighbor updates on non-orc interfaces
*/
if (nd_msg->ndm_state != NUD_STALE &&
nd_msg->ndm_state != NUD_PERMANENT &&
nd_msg->ndm_state != NUD_FAILED &&
nd_msg->ndm_state != NUD_REACHABLE)
{
orc_trace("Ignoring irrelevant neighbor update:"
" not STALE/PERM/REACHABLE/FAILED\n");
return 0;
}
/** note: the RTA_NEXT() macro decrements rtattr_len each time */
for(; RTA_OK(attr, rtattr_len); attr = RTA_NEXT(attr, rtattr_len))
{
switch (attr->rta_type)
{
case NDA_DST:
found_l3_addr = 1;
memcpy(&neigh->ip, RTA_DATA(attr), sizeof(neigh->ip));
orc_debug("Parsed IPv4 neighbor L3 addr: " IPV4_FORMAT "\n",
IPV4_ADDR_PRINT(neigh->ip));
break;
case NDA_LLADDR:
neigh->mac_valid = 1;
memcpy(neigh->mac, RTA_DATA(attr), 6);
orc_debug("Parsed IPv4 neighbor L2 addr: " ETH_FORMAT "\n",
ETH_ADDR_PRINT(neigh->mac));
break;
case NDA_CACHEINFO:
orc_trace("Ignoring irrelevant neighbor attr NDA_CACHEINFO\n");
break;
case NDA_PROBES:
orc_trace("Ignoring irrelevant neighbor attr NDA_PROBES\n");
break;
default:
/** TODO: decide if we actually need anything from here */
orc_warn("Skipping unhandled ipv4 neighbor attr: %d\n", attr->rta_type);
};
}
return found_l3_addr;
}
static void rtnl_print_neigh(struct nlmsghdr *hdr)
{
struct ndmsg *ndm = NLMSG_DATA(hdr);
uint32_t attrs_len = NDA_PAYLOAD(hdr);
struct rtattr *attr = NDA_RTA(ndm);
struct nda_cacheinfo *ci;
int hz = get_user_hz();
char addr_str[256];
char hw_addr[30];
char states[256];
char flags[256];
if (hdr->nlmsg_len < NLMSG_LENGTH(sizeof(*ndm)))
return;
tprintf(" [ Neigh Family %d (%s%s%s)", ndm->ndm_family,
colorize_start(bold),
addr_family2str(ndm->ndm_family),
colorize_end());
tprintf(", Link Index %d", ndm->ndm_ifindex);
tprintf(", State %d (%s%s%s)", ndm->ndm_state,
colorize_start(bold),
flags2str(neigh_states, ndm->ndm_state, states,
sizeof(states)),
colorize_end());
tprintf(", Flags %d (%s%s%s)", ndm->ndm_flags,
colorize_start(bold),
flags2str(neigh_flags, ndm->ndm_flags, flags,
sizeof(flags)),
colorize_end());
tprintf(", Type %d (%s%s%s)", ndm->ndm_type,
colorize_start(bold),
route_type2str(ndm->ndm_type),
colorize_end());
tprintf(" ]\n");
for (; RTA_OK(attr, attrs_len); attr = RTA_NEXT(attr, attrs_len)) {
switch (attr->rta_type) {
case NDA_DST:
rta_fmt(attr, "Address %s", addr2str(ndm->ndm_family,
RTA_DATA(attr), addr_str,
sizeof(addr_str)));
break;
case NDA_LLADDR:
rta_fmt(attr, "HW Address %s",
device_addr2str(RTA_DATA(attr),
RTA_LEN(attr), 0, hw_addr,
sizeof(hw_addr)));
break;
case NDA_PROBES:
rta_fmt(attr, "Probes %d", RTA_UINT32(attr));
break;
case NDA_CACHEINFO:
ci = RTA_DATA(attr);
tprintf("\tA: Cache (");
tprintf("confirmed(%ds)", ci->ndm_confirmed / hz);
tprintf(", used(%ds)", ci->ndm_used / hz);
tprintf(", updated(%ds)", ci->ndm_updated / hz);
tprintf(", refcnt(%d))", ci->ndm_refcnt);
tprintf(", Len %d\n", RTA_LEN(attr));
break;
default:
rta_fmt(attr, "0x%x", attr->rta_type);
break;
}
}
}
