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_forward.c | 159 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 159 insertions(+) create mode 100644 net/bridge/br_forward.c (limited to 'net/bridge/br_forward.c') diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c new file mode 100644 index 00000000000..ef9f2095f96 --- /dev/null +++ b/net/bridge/br_forward.c @@ -0,0 +1,159 @@ +/* + * Forwarding decision + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek + * + * $Id: br_forward.c,v 1.4 2001/08/14 22:05:57 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" + +static inline int should_deliver(const struct net_bridge_port *p, + const struct sk_buff *skb) +{ + if (skb->dev == p->dev || + p->state != BR_STATE_FORWARDING) + return 0; + + return 1; +} + +int br_dev_queue_push_xmit(struct sk_buff *skb) +{ + if (skb->len > skb->dev->mtu) + kfree_skb(skb); + else { +#ifdef CONFIG_BRIDGE_NETFILTER + /* ip_refrag calls ip_fragment, doesn't copy the MAC header. */ + nf_bridge_maybe_copy_header(skb); +#endif + skb_push(skb, ETH_HLEN); + + dev_queue_xmit(skb); + } + + return 0; +} + +int br_forward_finish(struct sk_buff *skb) +{ + NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev, + br_dev_queue_push_xmit); + + return 0; +} + +static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb) +{ + skb->dev = to->dev; +#ifdef CONFIG_NETFILTER_DEBUG + skb->nf_debug = 0; +#endif + NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, + br_forward_finish); +} + +static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb) +{ + struct net_device *indev; + + indev = skb->dev; + skb->dev = to->dev; + skb->ip_summed = CHECKSUM_NONE; + + NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev, + br_forward_finish); +} + +/* called with rcu_read_lock */ +void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb) +{ + if (should_deliver(to, skb)) { + __br_deliver(to, skb); + return; + } + + kfree_skb(skb); +} + +/* called with rcu_read_lock */ +void br_forward(const struct net_bridge_port *to, struct sk_buff *skb) +{ + if (should_deliver(to, skb)) { + __br_forward(to, skb); + return; + } + + kfree_skb(skb); +} + +/* called under bridge lock */ +static void br_flood(struct net_bridge *br, struct sk_buff *skb, int clone, + void (*__packet_hook)(const struct net_bridge_port *p, + struct sk_buff *skb)) +{ + struct net_bridge_port *p; + struct net_bridge_port *prev; + + if (clone) { + struct sk_buff *skb2; + + if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) { + br->statistics.tx_dropped++; + return; + } + + skb = skb2; + } + + prev = NULL; + + list_for_each_entry_rcu(p, &br->port_list, list) { + if (should_deliver(p, skb)) { + if (prev != NULL) { + struct sk_buff *skb2; + + if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) { + br->statistics.tx_dropped++; + kfree_skb(skb); + return; + } + + __packet_hook(prev, skb2); + } + + prev = p; + } + } + + if (prev != NULL) { + __packet_hook(prev, skb); + return; + } + + kfree_skb(skb); +} + + +/* called with rcu_read_lock */ +void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, int clone) +{ + br_flood(br, skb, clone, __br_deliver); +} + +/* called under bridge lock */ +void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, int clone) +{ + br_flood(br, skb, clone, __br_forward); +} -- cgit v1.2.3