[PATCH v2 5/9] arp: Check all configured addresses in ARP filtering

[Jon Maloy <jmaloy@redhat.com>]

As a preparation for handling multiple addresses, we update ignore_arp()
to check against all addresses in the addrs[] array.

Signed-off-by: Jon Maloy <jmaloy@redhat.com>
---
 arp.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arp.c b/arp.c
index bc77a9f..d8063e2 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 +55,11 @@ 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, inany_v4(&c->ip4.addrs[0].addr), sizeof(am->tip)))
-		return true;
+	/* Don't resolve any of the guest's addresses */
+	for (i = 0; i < c->ip4.addr_count; i++)
+		if (!memcmp(am->tip, inany_v4(&c->ip4.addrs[i].addr),
+			    sizeof(am->tip)))
+			return true;
 
 	return false;
 }
-- 
2.52.0