From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- net/bridge/br_input.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100644 net/bridge/br_input.c (limited to 'net/bridge/br_input.c') diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c new file mode 100644 index 0000000..2b1cce4 --- /dev/null +++ b/net/bridge/br_input.c @@ -0,0 +1,144 @@ +/* + * Handle incoming frames + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek + * + * $Id: br_input.c,v 1.10 2001/12/24 04:50:20 davem Exp $ + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include +#include +#include +#include +#include "br_private.h" + +const unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; + +static int br_pass_frame_up_finish(struct sk_buff *skb) +{ +#ifdef CONFIG_NETFILTER_DEBUG + skb->nf_debug = 0; +#endif + netif_rx(skb); + + return 0; +} + +static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb) +{ + struct net_device *indev; + + br->statistics.rx_packets++; + br->statistics.rx_bytes += skb->len; + + indev = skb->dev; + skb->dev = br->dev; + + NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL, + br_pass_frame_up_finish); +} + +/* note: already called with rcu_read_lock (preempt_disabled) */ +int br_handle_frame_finish(struct sk_buff *skb) +{ + const unsigned char *dest = eth_hdr(skb)->h_dest; + struct net_bridge_port *p = skb->dev->br_port; + struct net_bridge *br = p->br; + struct net_bridge_fdb_entry *dst; + int passedup = 0; + + if (br->dev->flags & IFF_PROMISC) { + struct sk_buff *skb2; + + skb2 = skb_clone(skb, GFP_ATOMIC); + if (skb2 != NULL) { + passedup = 1; + br_pass_frame_up(br, skb2); + } + } + + if (dest[0] & 1) { + br_flood_forward(br, skb, !passedup); + if (!passedup) + br_pass_frame_up(br, skb); + goto out; + } + + dst = __br_fdb_get(br, dest); + if (dst != NULL && dst->is_local) { + if (!passedup) + br_pass_frame_up(br, skb); + else + kfree_skb(skb); + goto out; + } + + if (dst != NULL) { + br_forward(dst->dst, skb); + goto out; + } + + br_flood_forward(br, skb, 0); + +out: + return 0; +} + +/* + * Called via br_handle_frame_hook. + * Return 0 if *pskb should be processed furthur + * 1 if *pskb is handled + * note: already called with rcu_read_lock (preempt_disabled) + */ +int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb) +{ + struct sk_buff *skb = *pskb; + const unsigned char *dest = eth_hdr(skb)->h_dest; + + if (p->state == BR_STATE_DISABLED) + goto err; + + if (!is_valid_ether_addr(eth_hdr(skb)->h_source)) + goto err; + + if (p->state == BR_STATE_LEARNING || + p->state == BR_STATE_FORWARDING) + br_fdb_update(p->br, p, eth_hdr(skb)->h_source); + + if (p->br->stp_enabled && + !memcmp(dest, bridge_ula, 5) && + !(dest[5] & 0xF0)) { + if (!dest[5]) { + NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev, + NULL, br_stp_handle_bpdu); + return 1; + } + } + + else if (p->state == BR_STATE_FORWARDING) { + if (br_should_route_hook) { + if (br_should_route_hook(pskb)) + return 0; + skb = *pskb; + dest = eth_hdr(skb)->h_dest; + } + + if (!memcmp(p->br->dev->dev_addr, dest, ETH_ALEN)) + skb->pkt_type = PACKET_HOST; + + NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, + br_handle_frame_finish); + return 1; + } + +err: + kfree_skb(skb); + return 1; +} -- cgit v1.1