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net: l2: Clear arp cache when disable interface.

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When connect to diffrent router with the same gateway ip address,
need to clear arp cache when disable interface,
or it will use the wrong gateway mac address.
Call net_arp_clear_cache function replace to set arp_table 0.

Change-Id: Ib403a0c0030832ba48824db4d2d3fcb8add63d16
Signed-off-by: june li <junelizh@foxmail.com>
This commit is contained in:
june li 2017-04-22 14:13:23 +08:00 • committed by Jukka Rissanen
commit 3e4faffede
3 changed files with 29 additions and 2 deletions
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2
include/net/arp.h
View file

@ -39,10 +39,12 @@ struct net_arp_hdr {
struct net_pkt *net_arp_prepare(struct net_pkt *pkt);
enum net_verdict net_arp_input(struct net_pkt *pkt);
void net_arp_clear_cache(void);
void net_arp_init(void);
#else /* CONFIG_NET_ARP */
#define net_arp_clear_cache(...)
#define net_arp_init(...)
#endif /* CONFIG_NET_ARP */

15
subsys/net/ip/l2/arp.c
View file

@ -483,7 +483,20 @@ enum net_verdict net_arp_input(struct net_pkt *pkt)
return NET_OK;
}
void net_arp_init(void)
void net_arp_clear_cache(void)
{
int i;
for (i = 0; i < CONFIG_NET_ARP_TABLE_SIZE; i++) {
if (arp_table[i].pending) {
net_pkt_unref(arp_table[i].pending);
}
}
memset(&arp_table, 0, sizeof(arp_table));
}
void net_arp_init(void)
{
net_arp_clear_cache();
}

14
subsys/net/ip/l2/ethernet.c
View file

@ -310,4 +310,16 @@ static inline u16_t ethernet_reserve(struct net_if *iface, void *unused)
return sizeof(struct net_eth_hdr);
}
NET_L2_INIT(ETHERNET_L2, ethernet_recv, ethernet_send, ethernet_reserve, NULL);
static inline int ethernet_enable(struct net_if *iface, bool state)
{
ARG_UNUSED(iface);
if (!state) {
net_arp_clear_cache();
}
return 0;
}
NET_L2_INIT(ETHERNET_L2, ethernet_recv, ethernet_send, ethernet_reserve,
ethernet_enable);