Function ng_bridge_rcvdata

freebsd/netgraph/ng_bridge.c:654–812

}

static int
ng_bridge_rcvdata(hook_p hook, item_p item)
{
	const node_p node = NG_HOOK_NODE(hook);
	const priv_p priv = NG_NODE_PRIVATE(node);
	struct ng_bridge_host *host;
	struct ether_header *eh;
	struct ng_bridge_send_ctx ctx = { 0 };
	hook_p ret;

	NGI_GET_M(item, ctx.m);

	ctx.incoming = NG_HOOK_PRIVATE(hook);
	/* Sanity check packet and pull up header */
	if (ctx.m->m_pkthdr.len < ETHER_HDR_LEN) {
		ctx.incoming->stats.recvRunts++;
		NG_FREE_ITEM(item);
		NG_FREE_M(ctx.m);
		return (EINVAL);
	}
	if (ctx.m->m_len < ETHER_HDR_LEN && !(ctx.m = m_pullup(ctx.m, ETHER_HDR_LEN))) {
		ctx.incoming->stats.memoryFailures++;
		NG_FREE_ITEM(item);
		return (ENOBUFS);
	}
	eh = mtod(ctx.m, struct ether_header *);
	if ((eh->ether_shost[0] & 1) != 0) {
		ctx.incoming->stats.recvInvalid++;
		NG_FREE_ITEM(item);
		NG_FREE_M(ctx.m);
		return (EINVAL);
	}

	/* Is link disabled due to a loopback condition? */
	if (ctx.incoming->loopCount != 0) {
		ctx.incoming->stats.loopDrops++;
		NG_FREE_ITEM(item);
		NG_FREE_M(ctx.m);
		return (ELOOP);		/* XXX is this an appropriate error? */
	}

	/* Update stats */
	ctx.incoming->stats.recvPackets++;
	ctx.incoming->stats.recvOctets += ctx.m->m_pkthdr.len;
	if ((ctx.manycast = (eh->ether_dhost[0] & 1)) != 0) {
		if (ETHER_EQUAL(eh->ether_dhost, ng_bridge_bcast_addr)) {
			ctx.incoming->stats.recvBroadcasts++;
			ctx.manycast = 2;
		} else
			ctx.incoming->stats.recvMulticasts++;
	}

	/* Look up packet's source Ethernet address in hashtable */
	if ((host = ng_bridge_get(priv, eh->ether_shost)) != NULL) {
		/* Update time since last heard from this host */
		host->staleness = 0;

		/* Did host jump to a different link? */