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ctdb-daemon: Gratuitous ARP equivalent for IPv6 is neighbor advertisement

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Not neighbour solicitation.  See:

  https://tools.ietf.org/html/rfc4861#section-4.4

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
This commit is contained in:
Martin Schwenke 2014-12-02 10:57:12 +11:00 committed by Martin Schwenke
parent 3a2c8bb906
commit 7f3f3b15d5
1 changed files with 32 additions and 13 deletions
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45
ctdb/common/system_linux.c
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@ -75,9 +75,14 @@ int ctdb_sys_send_arp(const ctdb_sock_addr *addr, const char *iface)
struct ether_header *eh;
struct arphdr *ah;
struct ip6_hdr *ip6;
struct nd_neighbor_solicit *nd_ns;
struct nd_neighbor_advert *nd_na;
struct nd_opt_hdr *nd_oh;
struct ifreq if_hwaddr;
unsigned char buffer[78]; /* ipv6 neigh solicitation size */
/* Size of IPv6 neighbor advertisement (with option) */
unsigned char buffer[sizeof(struct ether_header) +
sizeof(struct ip6_hdr) +
sizeof(struct nd_neighbor_advert) +
sizeof(struct nd_opt_hdr) + ETH_ALEN];
char *ptr;
char bdcast[] = {0xff,0xff,0xff,0xff,0xff,0xff};
struct ifreq ifr;
@ -219,31 +224,45 @@ int ctdb_sys_send_arp(const ctdb_sock_addr *addr, const char *iface)
memset(buffer, 0 , sizeof(buffer));
eh = (struct ether_header *)buffer;
memset(eh->ether_dhost, 0xff, ETH_ALEN);
/* Ethernet multicast: 33:33:00:00:00:01 (see RFC2464,
* section 7) - note zeroes above! */
eh->ether_dhost[0] = eh->ether_dhost[1] = 0x33;
eh->ether_dhost[5] = 0x01;
memcpy(eh->ether_shost, if_hwaddr.ifr_hwaddr.sa_data, ETH_ALEN);
eh->ether_type = htons(ETHERTYPE_IP6);
ip6 = (struct ip6_hdr *)(eh+1);
ip6->ip6_vfc = 0x60;
ip6->ip6_plen = htons(sizeof(*nd_ns));
ip6->ip6_plen = htons(sizeof(*nd_na) +
sizeof(struct nd_opt_hdr) +
ETH_ALEN);
ip6->ip6_nxt = IPPROTO_ICMPV6;
ip6->ip6_hlim = 255;
ip6->ip6_dst = addr->ip6.sin6_addr;
ip6->ip6_src = addr->ip6.sin6_addr;
/* all-nodes multicast */
inet_pton(AF_INET6, "ff02::1", &ip6->ip6_dst);
nd_ns = (struct nd_neighbor_solicit *)(ip6+1);
nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
nd_ns->nd_ns_code = 0;
nd_ns->nd_ns_reserved = 0;
nd_ns->nd_ns_target = addr->ip6.sin6_addr;
nd_na = (struct nd_neighbor_advert *)(ip6+1);
nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
nd_na->nd_na_code = 0;
nd_na->nd_na_flags_reserved = ND_NA_FLAG_OVERRIDE;
nd_na->nd_na_target = addr->ip6.sin6_addr;
/* Option: Target link-layer address */
nd_oh = (struct nd_opt_hdr *)(nd_na+1);
nd_oh->nd_opt_type = ND_OPT_TARGET_LINKADDR;
nd_oh->nd_opt_len = 1;
memcpy(&(nd_oh+1)[0], if_hwaddr.ifr_hwaddr.sa_data, ETH_ALEN);
nd_ns->nd_ns_cksum = tcp_checksum6((uint16_t *)nd_ns, ntohs(ip6->ip6_plen), ip6);
nd_na->nd_na_cksum = tcp_checksum6((uint16_t *)nd_na,
ntohs(ip6->ip6_plen), ip6);
sall.sll_family = AF_PACKET;
sall.sll_halen = 6;
memcpy(&sall.sll_addr[0], bdcast, sall.sll_halen);
memcpy(&sall.sll_addr[0], &eh->ether_dhost[0], sall.sll_halen);
sall.sll_protocol = htons(ETH_P_ALL);
sall.sll_ifindex = ifr.ifr_ifindex;
ret = sendto(s, buffer, 78, 0, (struct sockaddr *)&sall, sizeof(sall));
ret = sendto(s, buffer, sizeof(buffer),
0, (struct sockaddr *)&sall, sizeof(sall));
if (ret < 0 ){
close(s);
DEBUG(DEBUG_CRIT,(__location__ " failed sendto\n"));