[RFC 06/12] arp: Check all configured addresses in ARP filtering

[Jon Maloy <jmaloy@redhat.com>]

We update ignore_arp() to check against all addresses in the addrs[]
array, not just addrs[0]. This ensures ARP requests for any of the
guest's configured addresses are properly ignored.

Signed-off-by: Jon Maloy <jmaloy@redhat.com>
---
 arp.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arp.c b/arp.c
index 7eaf517..61c309e 100644
--- a/arp.c
+++ b/arp.c
@@ -41,6 +41,8 @@
 static bool ignore_arp(const struct ctx *c,
 		       const struct arphdr *ah, const struct arpmsg *am)
 {
+	int i;
+
 	if (ah->ar_hrd != htons(ARPHRD_ETHER)	||
 	    ah->ar_pro != htons(ETH_P_IP)	||
 	    ah->ar_hln != ETH_ALEN		||
@@ -53,9 +55,10 @@ static bool ignore_arp(const struct ctx *c,
 	    !memcmp(am->sip, am->tip, sizeof(am->sip)))
 		return true;
 
-	/* Don't resolve the guest's assigned address, either. */
-	if (!memcmp(am->tip, &c->ip4.addrs[0].addr, sizeof(am->tip)))
-		return true;
+	/* Don't resolve any of the guest's assigned addresses, either */
+	for (i = 0; i < c->ip4.addr_count; i++)
+		if (!memcmp(am->tip, &c->ip4.addrs[i].addr, sizeof(am->tip)))
+			return true;
 
 	return false;
 }
-- 
2.51.1