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ETHARP_SUPPORT_VLAN: add support for an external VLAN filter function instead of only checking for one VLAN (define ETHARP_VLAN_CHECK_FN)

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This commit is contained in:
Simon Goldschmidt
2011-07-26 21:03:27 +02:00
parent 41c785d77a
commit 242dc34115
3 changed files with 12 additions and 2 deletions
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2
src/include/lwip/opt.h
View File

@@ -461,6 +461,8 @@
* Additionally, you can define ETHARP_VLAN_CHECK to an u16_t VLAN ID to check.
* If ETHARP_VLAN_CHECK is defined, only VLAN-traffic for this VLAN is accepted.
* If ETHARP_VLAN_CHECK is not defined, all traffic is accepted.
* Alternatively, define a function/define ETHARP_VLAN_CHECK_FN(eth_hdr, vlan)
* that returns 1 to accept a packet or 0 to drop a packet.
*/
#ifndef ETHARP_SUPPORT_VLAN
#define ETHARP_SUPPORT_VLAN 0

8
src/netif/etharp.c
View File

@@ -1297,13 +1297,17 @@ ethernet_input(struct pbuf *p, struct netif *netif)
ETHARP_STATS_INC(etharp.drop);
goto free_and_return;
}
#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
#if defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) /* if not, allow all VLANs */
#ifdef ETHARP_VLAN_CHECK_FN
if (!ETHARP_VLAN_CHECK_FN(ethhdr, vlan)) {
#elif defined(ETHARP_VLAN_CHECK)
if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
#endif
/* silently ignore this packet: not for our VLAN */
pbuf_free(p);
return ERR_OK;
}
#endif /* ETHARP_VLAN_CHECK */
#endif /* defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) */
type = vlan->tpid;
ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
}