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[Backport v3.7-branch] net: ipv4: Fix ARP probe check in address conflict detection #80565

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Merged
nashif merged 1 commit into from
Nov 4, 2024
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[Backport v3.7-branch] net: ipv4: Fix ARP probe check in address conflict detection #80565

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9 changes: 6 additions & 3 deletions subsys/net/ip/ipv4_acd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -288,15 +288,18 @@ enum net_verdict net_ipv4_acd_input(struct net_if *iface, struct net_pkt *pkt)
ll_addr = net_if_get_link_addr(addr_iface);

/* RFC 5227, ch. 2.1.1 Probe Details:
* - Sender IP address match OR,
* - Target IP address match with different sender HW address,
* - ARP Request/Reply with Sender IP address match OR,
* - ARP Probe where Target IP address match with different sender HW address,
* indicate a conflict.
* ARP Probe has an all-zero sender IP address
*/
if (net_ipv4_addr_cmp_raw(arp_hdr->src_ipaddr,
(uint8_t *)&ifaddr->address.in_addr) ||
(net_ipv4_addr_cmp_raw(arp_hdr->dst_ipaddr,
(uint8_t *)&ifaddr->address.in_addr) &&
memcmp(&arp_hdr->src_hwaddr, ll_addr->addr, ll_addr->len) != 0)) {
(memcmp(&arp_hdr->src_hwaddr, ll_addr->addr, ll_addr->len) != 0) &&
(net_ipv4_addr_cmp_raw(arp_hdr->src_ipaddr,
(uint8_t *)&(struct in_addr)INADDR_ANY_INIT)))) {
NET_DBG("Conflict detected from %s for %s",
net_sprint_ll_addr((uint8_t *)&arp_hdr->src_hwaddr,
arp_hdr->hwlen),
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