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authorJoe Hershberger <joe.hershberger@ni.com>2013-02-08 14:18:53 -0600
committerJoe Hershberger <joe.hershberger@ni.com>2013-06-24 19:11:13 -0500
commit5da7cf81c8d76c7b5ddf5225224141eae4e706be (patch)
tree0ea9ad8019a3840aef63ed0727e0b72413a44463 /net/link_local.c
parent62d7dba7be212f9834d4aa8f1920f484dec0075c (diff)
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net: Correct check for link-local target IP conflict
Make the link-local code conform more completely with the RFC. This will prevent ARP queries for the target (such as while it is rebooting) from causing the device to choose a different link-local address, thinking that its address is in use by another machine. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Diffstat (limited to 'net/link_local.c')
-rw-r--r--net/link_local.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/net/link_local.c b/net/link_local.c
index 1ba796e..4152fae 100644
--- a/net/link_local.c
+++ b/net/link_local.c
@@ -206,6 +206,7 @@ void link_local_receive_arp(struct arp_hdr *arp, int len)
{
int source_ip_conflict;
int target_ip_conflict;
+ IPaddr_t null_ip = 0;
if (state == DISABLED)
return;
@@ -267,10 +268,18 @@ void link_local_receive_arp(struct arp_hdr *arp, int len)
) {
source_ip_conflict = 1;
}
- if (arp->ar_op == htons(ARPOP_REQUEST)
- && memcmp(&arp->ar_tpa, &ip, ARP_PLEN) == 0
- && memcmp(&arp->ar_tha, NetOurEther, ARP_HLEN) != 0
- ) {
+
+ /*
+ * According to RFC 3927, section 2.2.1:
+ * Check if packet is an ARP probe by checking for a null source IP
+ * then check that target IP is equal to ours and source hw addr
+ * is not equal to ours. This condition should cause a conflict only
+ * during probe.
+ */
+ if (arp->ar_op == htons(ARPOP_REQUEST) &&
+ memcmp(&arp->ar_spa, &null_ip, ARP_PLEN) == 0 &&
+ memcmp(&arp->ar_tpa, &ip, ARP_PLEN) == 0 &&
+ memcmp(&arp->ar_sha, NetOurEther, ARP_HLEN) != 0) {
target_ip_conflict = 1;
}