diff options
author | Steven Barth <steven@midlink.org> | 2014-07-21 12:10:38 +0200 |
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committer | Steven Barth <steven@midlink.org> | 2014-07-21 12:10:38 +0200 |
commit | 67b311ab81736b35858664219d345844ab08fcc7 (patch) | |
tree | 4405ad173dc569a3b8efb15bcf6bd2a03c32bc96 | |
parent | 26c5466e626735f27dd073b727b02612c5a807cd (diff) | |
download | odhcp6c-67b311ab81736b35858664219d345844ab08fcc7.tar.gz |
Send router solicitations with source link-layer addressbfd
-rw-r--r-- | src/ra.c | 22 |
1 files changed, 20 insertions, 2 deletions
@@ -26,6 +26,7 @@ #include <arpa/inet.h> #include <sys/socket.h> #include <sys/types.h> +#include <sys/ioctl.h> #include <netinet/in.h> #include <netinet/icmp6.h> @@ -132,9 +133,26 @@ int ra_init(const char *ifname, const struct in6_addr *ifid) static void ra_send_rs(int signal __attribute__((unused))) { - const struct icmp6_hdr rs = {ND_ROUTER_SOLICIT, 0, 0, {{0}}}; + struct { + struct icmp6_hdr hdr; + struct icmpv6_opt lladdr; + } rs = { + .hdr = {ND_ROUTER_SOLICIT, 0, 0, {{0}}}, + .lladdr = {ND_OPT_SOURCE_LINKADDR, 1, {0}}, + }; const struct sockaddr_in6 dest = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, if_index}; - sendto(sock, &rs, sizeof(rs), MSG_DONTWAIT, (struct sockaddr*)&dest, sizeof(dest)); + size_t len = sizeof(rs); + + struct ifreq ifr; + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name)); + if (!ioctl(sock, SIOCGIFHWADDR, &ifr) + && memcmp(rs.lladdr.data, ifr.ifr_hwaddr.sa_data, 6)) + memcpy(rs.lladdr.data, ifr.ifr_hwaddr.sa_data, 6); + else + len = sizeof(struct icmp6_hdr); + + sendto(sock, &rs, len, MSG_DONTWAIT, (struct sockaddr*)&dest, sizeof(dest)); if (++rs_attempt <= 3) alarm(4); |