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netif: fix the netif's index error

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When using multiple netifs on one hardware interface (e.g. when mapping multiple IP addresses to one hardware interface), if the netif's low-level receive routine cannot decide for the correct netif, here the `netif` parameter may be a default netif, in this case, `p-> if_idx` will get a wrong netif index value. It should be placed after `netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, lwip_htons(type));`.  Filter function can returns the correct netif before assigning `p-> if_idx`.
This commit is contained in:
weycen 2021-09-26 23:05:53 +08:00 committed by Erik Ekman
parent 63d21c53e5
commit 9f7d9170c1
1 changed files with 4 additions and 4 deletions
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8
src/netif/ethernet.c
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@ -96,10 +96,6 @@ ethernet_input(struct pbuf *p, struct netif *netif)
goto free_and_return;
}
if (p->if_idx == NETIF_NO_INDEX) {
p->if_idx = netif_get_index(netif);
}
/* points to packet payload, which starts with an Ethernet header */
ethhdr = (struct eth_hdr *)p->payload;
LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
@ -143,6 +139,10 @@ ethernet_input(struct pbuf *p, struct netif *netif)
netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, lwip_htons(type));
#endif /* LWIP_ARP_FILTER_NETIF*/
if (p->if_idx == NETIF_NO_INDEX) {
p->if_idx = netif_get_index(netif);
}
if (ethhdr->dest.addr[0] & 1) {
/* this might be a multicast or broadcast packet */
if (ethhdr->dest.addr[0] == LL_IP4_MULTICAST_ADDR_0) {