From f9d677bff6af48b50f3655224e8b0eb8820d3e89 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Fri, 18 Oct 2024 12:35:50 +1100 Subject: [PATCH] arp: Fix a handful of small warts This fixes a number of harmless but slightly ugly warts in the ARP resolution code: * Use in4addr_any to represent 0.0.0.0 rather than hand constructing an example. * When comparing am->sip against 0.0.0.0 use sizeof(am->sip) instead of sizeof(am->tip) (same value, but makes more logical sense) * Described the guest's assigned address as such, rather than as "our address" - that's not usually what we mean by "our address" these days * Remove "we might have the same IP address" comment which I can't make sense of in context (possibly it's relating to the statement below, which already has its own comment?) Signed-off-by: David Gibson Signed-off-by: Stefano Brivio --- arp.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/arp.c b/arp.c index 53334da..fc482bb 100644 --- a/arp.c +++ b/arp.c @@ -59,14 +59,12 @@ int arp(const struct ctx *c, const struct pool *p) ah->ar_op != htons(ARPOP_REQUEST)) return 1; - /* Discard announcements (but not 0.0.0.0 "probes"): we might have the - * same IP address, hide that. - */ - if (memcmp(am->sip, (unsigned char[4]){ 0 }, sizeof(am->tip)) && + /* Discard announcements, but not 0.0.0.0 "probes" */ + if (memcmp(am->sip, &in4addr_any, sizeof(am->sip)) && !memcmp(am->sip, am->tip, sizeof(am->sip))) return 1; - /* Don't resolve our own address, either. */ + /* Don't resolve the guest's assigned address, either. */ if (!memcmp(am->tip, &c->ip4.addr, sizeof(am->tip))) return 1;