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!
This commit is contained in:
Linus Torvalds
205
net/bridge/br_stp_bpdu.c
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205
net/bridge/br_stp_bpdu.c
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/*
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* Spanning tree protocol; BPDU handling
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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* $Id: br_stp_bpdu.c,v 1.3 2001/11/10 02:35:25 davem Exp $
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/netfilter_bridge.h>
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#include "br_private.h"
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#include "br_private_stp.h"
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#define JIFFIES_TO_TICKS(j) (((j) << 8) / HZ)
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#define TICKS_TO_JIFFIES(j) (((j) * HZ) >> 8)
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static void br_send_bpdu(struct net_bridge_port *p, unsigned char *data, int length)
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{
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struct net_device *dev;
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struct sk_buff *skb;
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int size;
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if (!p->br->stp_enabled)
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return;
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size = length + 2*ETH_ALEN + 2;
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if (size < 60)
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size = 60;
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dev = p->dev;
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if ((skb = dev_alloc_skb(size)) == NULL) {
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printk(KERN_INFO "br: memory squeeze!\n");
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return;
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}
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skb->dev = dev;
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skb->protocol = htons(ETH_P_802_2);
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skb->mac.raw = skb_put(skb, size);
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memcpy(skb->mac.raw, bridge_ula, ETH_ALEN);
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memcpy(skb->mac.raw+ETH_ALEN, dev->dev_addr, ETH_ALEN);
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skb->mac.raw[2*ETH_ALEN] = 0;
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skb->mac.raw[2*ETH_ALEN+1] = length;
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skb->nh.raw = skb->mac.raw + 2*ETH_ALEN + 2;
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memcpy(skb->nh.raw, data, length);
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memset(skb->nh.raw + length, 0xa5, size - length - 2*ETH_ALEN - 2);
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NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
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dev_queue_xmit);
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}
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static __inline__ void br_set_ticks(unsigned char *dest, int jiff)
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{
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__u16 ticks;
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ticks = JIFFIES_TO_TICKS(jiff);
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dest[0] = (ticks >> 8) & 0xFF;
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dest[1] = ticks & 0xFF;
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}
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static __inline__ int br_get_ticks(unsigned char *dest)
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{
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return TICKS_TO_JIFFIES((dest[0] << 8) | dest[1]);
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}
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/* called under bridge lock */
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void br_send_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
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{
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unsigned char buf[38];
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buf[0] = 0x42;
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buf[1] = 0x42;
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buf[2] = 0x03;
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buf[3] = 0;
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buf[4] = 0;
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buf[5] = 0;
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buf[6] = BPDU_TYPE_CONFIG;
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buf[7] = (bpdu->topology_change ? 0x01 : 0) |
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(bpdu->topology_change_ack ? 0x80 : 0);
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buf[8] = bpdu->root.prio[0];
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buf[9] = bpdu->root.prio[1];
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buf[10] = bpdu->root.addr[0];
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buf[11] = bpdu->root.addr[1];
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buf[12] = bpdu->root.addr[2];
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buf[13] = bpdu->root.addr[3];
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buf[14] = bpdu->root.addr[4];
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buf[15] = bpdu->root.addr[5];
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buf[16] = (bpdu->root_path_cost >> 24) & 0xFF;
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buf[17] = (bpdu->root_path_cost >> 16) & 0xFF;
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buf[18] = (bpdu->root_path_cost >> 8) & 0xFF;
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buf[19] = bpdu->root_path_cost & 0xFF;
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buf[20] = bpdu->bridge_id.prio[0];
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buf[21] = bpdu->bridge_id.prio[1];
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buf[22] = bpdu->bridge_id.addr[0];
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buf[23] = bpdu->bridge_id.addr[1];
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buf[24] = bpdu->bridge_id.addr[2];
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buf[25] = bpdu->bridge_id.addr[3];
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buf[26] = bpdu->bridge_id.addr[4];
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buf[27] = bpdu->bridge_id.addr[5];
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buf[28] = (bpdu->port_id >> 8) & 0xFF;
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buf[29] = bpdu->port_id & 0xFF;
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br_set_ticks(buf+30, bpdu->message_age);
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br_set_ticks(buf+32, bpdu->max_age);
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br_set_ticks(buf+34, bpdu->hello_time);
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br_set_ticks(buf+36, bpdu->forward_delay);
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br_send_bpdu(p, buf, 38);
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}
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/* called under bridge lock */
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void br_send_tcn_bpdu(struct net_bridge_port *p)
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{
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unsigned char buf[7];
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buf[0] = 0x42;
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buf[1] = 0x42;
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buf[2] = 0x03;
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buf[3] = 0;
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buf[4] = 0;
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buf[5] = 0;
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buf[6] = BPDU_TYPE_TCN;
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br_send_bpdu(p, buf, 7);
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}
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static const unsigned char header[6] = {0x42, 0x42, 0x03, 0x00, 0x00, 0x00};
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/* NO locks */
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int br_stp_handle_bpdu(struct sk_buff *skb)
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{
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struct net_bridge_port *p = skb->dev->br_port;
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struct net_bridge *br = p->br;
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unsigned char *buf;
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/* need at least the 802 and STP headers */
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if (!pskb_may_pull(skb, sizeof(header)+1) ||
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memcmp(skb->data, header, sizeof(header)))
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goto err;
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buf = skb_pull(skb, sizeof(header));
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spin_lock_bh(&br->lock);
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if (p->state == BR_STATE_DISABLED
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|| !(br->dev->flags & IFF_UP)
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|| !br->stp_enabled)
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goto out;
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if (buf[0] == BPDU_TYPE_CONFIG) {
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struct br_config_bpdu bpdu;
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if (!pskb_may_pull(skb, 32))
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goto out;
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buf = skb->data;
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bpdu.topology_change = (buf[1] & 0x01) ? 1 : 0;
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bpdu.topology_change_ack = (buf[1] & 0x80) ? 1 : 0;
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bpdu.root.prio[0] = buf[2];
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bpdu.root.prio[1] = buf[3];
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bpdu.root.addr[0] = buf[4];
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bpdu.root.addr[1] = buf[5];
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bpdu.root.addr[2] = buf[6];
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bpdu.root.addr[3] = buf[7];
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bpdu.root.addr[4] = buf[8];
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bpdu.root.addr[5] = buf[9];
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bpdu.root_path_cost =
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(buf[10] << 24) |
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(buf[11] << 16) |
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(buf[12] << 8) |
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buf[13];
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bpdu.bridge_id.prio[0] = buf[14];
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bpdu.bridge_id.prio[1] = buf[15];
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bpdu.bridge_id.addr[0] = buf[16];
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bpdu.bridge_id.addr[1] = buf[17];
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bpdu.bridge_id.addr[2] = buf[18];
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bpdu.bridge_id.addr[3] = buf[19];
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bpdu.bridge_id.addr[4] = buf[20];
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bpdu.bridge_id.addr[5] = buf[21];
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bpdu.port_id = (buf[22] << 8) | buf[23];
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bpdu.message_age = br_get_ticks(buf+24);
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bpdu.max_age = br_get_ticks(buf+26);
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bpdu.hello_time = br_get_ticks(buf+28);
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bpdu.forward_delay = br_get_ticks(buf+30);
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br_received_config_bpdu(p, &bpdu);
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}
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else if (buf[0] == BPDU_TYPE_TCN) {
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br_received_tcn_bpdu(p);
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}
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out:
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spin_unlock_bh(&br->lock);
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err:
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kfree_skb(skb);
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return 0;
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}
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