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net/arp: support ARP entry learned on gratuitous ARP response

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learn arp when receive gratuitous arp response

Signed-off-by: wenquan1 <wenquan1@xiaomi.com>
This commit is contained in:
wenquan1
2025-08-01 10:39:40 +08:00
committed by archer
parent dfaed9b855
commit 7e4c3f4a60
2 changed files with 32 additions and 0 deletions
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net/arp/Kconfig
+9
View File
@@ -49,6 +49,15 @@ config NET_ARP_IPIN
time and the MAC addresses that you want will get flushed from
the table often.
config NET_ARP_GRATUITOUS
bool "Gratuitous ARP address accept"
default n
---help---
Accept IP/MAC address mappings from the ARP table from incoming
Gratuitous ARP packets. If this option is selected,
CONFIG_NET_ARTAB_SIZE should be large enough to hold the hosts
on the network.
config NET_ARP_SEND
bool "ARP send"
default y
net/arp/arp_input.c
+23
View File
@@ -89,6 +89,9 @@ static int arp_in(FAR struct net_driver_s *dev)
{
FAR struct arp_hdr_s *arp = ARPBUF;
in_addr_t ipaddr;
#ifdef CONFIG_NET_ARP_GRATUITOUS
in_addr_t sipaddr;
#endif /* CONFIG_NET_ARP_GRATUITOUS */
if (dev->d_len < (sizeof(struct arp_hdr_s) + ETH_HDRLEN))
{
@@ -100,6 +103,9 @@ static int arp_in(FAR struct net_driver_s *dev)
dev->d_len = 0;
ipaddr = net_ip4addr_conv32(arp->ah_dipaddr);
#ifdef CONFIG_NET_ARP_GRATUITOUS
sipaddr = net_ip4addr_conv32(arp->ah_sipaddr);
#endif /* CONFIG_NET_ARP_GRATUITOUS */
#ifdef CONFIG_NET_ARP_ACD
arp_acd_update(dev);
@@ -139,6 +145,23 @@ static int arp_in(FAR struct net_driver_s *dev)
eth->type = HTONS(ETHTYPE_ARP);
dev->d_len = sizeof(struct arp_hdr_s) + ETH_HDRLEN;
}
#ifdef CONFIG_NET_ARP_GRATUITOUS
else if (net_ipv4addr_cmp(sipaddr, ipaddr) &&
!net_ipv4addr_cmp(sipaddr, INADDR_ANY))
{
/* Gratuitous arp sender ip should same with target ip,
* and ignore IPv4 duplicate address detection packet (RFC2131)
*/
/* Gratuitous request arp the sender ip should be a unicast ip */
if (net_ipv4addr_cmp(sipaddr, dev->d_draddr) ||
net_ipv4addr_maskcmp(sipaddr, dev->d_ipaddr, dev->d_netmask))
{
arp_hdr_update(dev, arp->ah_sipaddr, arp->ah_shwaddr);
}
}
#endif /* CONFIG_NET_ARP_GRATUITOUS */
break;
case HTONS(ARP_REPLY):