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|
/*
* NET3: Token ring device handling subroutines
*
* 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.
*
* Fixes: 3 Feb 97 Paul Norton <pnorton@cts.com> Minor routing fixes.
* Added rif table to /proc/net/tr_rif and rif timeout to
* /proc/sys/net/token-ring/rif_timeout.
* 22 Jun 98 Paul Norton <p.norton@computer.org> Rearranged
* tr_header and tr_type_trans to handle passing IPX SNAP and
* 802.2 through the correct layers. Eliminated tr_reformat.
*
*/
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/trdevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/net.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/sysctl.h>
#include <net/arp.h>
#include <net/net_namespace.h>
static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev);
static void rif_check_expire(unsigned long dummy);
#define TR_SR_DEBUG 0
/*
* Each RIF entry we learn is kept this way
*/
struct rif_cache {
unsigned char addr[TR_ALEN];
int iface;
__be16 rcf;
__be16 rseg[8];
struct rif_cache *next;
unsigned long last_used;
unsigned char local_ring;
};
#define RIF_TABLE_SIZE 32
/*
* We hash the RIF cache 32 ways. We do after all have to look it
* up a lot.
*/
static struct rif_cache *rif_table[RIF_TABLE_SIZE];
static DEFINE_SPINLOCK(rif_lock);
/*
* Garbage disposal timer.
*/
static struct timer_list rif_timer;
static int sysctl_tr_rif_timeout = 60*10*HZ;
static inline unsigned long rif_hash(const unsigned char *addr)
{
unsigned long x;
x = addr[0];
x = (x << 2) ^ addr[1];
x = (x << 2) ^ addr[2];
x = (x << 2) ^ addr[3];
x = (x << 2) ^ addr[4];
x = (x << 2) ^ addr[5];
x ^= x >> 8;
return x & (RIF_TABLE_SIZE - 1);
}
/*
* Put the headers on a token ring packet. Token ring source routing
* makes this a little more exciting than on ethernet.
*/
static int tr_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type,
const void *daddr, const void *saddr, unsigned len)
{
struct trh_hdr *trh;
int hdr_len;
/*
* Add the 802.2 SNAP header if IP as the IPv4/IPv6 code calls
* dev->hard_header directly.
*/
if (type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
{
struct trllc *trllc;
hdr_len = sizeof(struct trh_hdr) + sizeof(struct trllc);
trh = (struct trh_hdr *)skb_push(skb, hdr_len);
trllc = (struct trllc *)(trh+1);
trllc->dsap = trllc->ssap = EXTENDED_SAP;
trllc->llc = UI_CMD;
trllc->protid[0] = trllc->protid[1] = trllc->protid[2] = 0x00;
trllc->ethertype = htons(type);
}
else
{
hdr_len = sizeof(struct trh_hdr);
trh = (struct trh_hdr *)skb_push(skb, hdr_len);
}
trh->ac=AC;
trh->fc=LLC_FRAME;
if(saddr)
memcpy(trh->saddr,saddr,dev->addr_len);
else
memcpy(trh->saddr,dev->dev_addr,dev->addr_len);
/*
* Build the destination and then source route the frame
*/
if(daddr)
{
memcpy(trh->daddr,daddr,dev->addr_len);
tr_source_route(skb, trh, dev);
return(hdr_len);
}
return -hdr_len;
}
/*
* A neighbour discovery of some species (eg arp) has completed. We
* can now send the packet.
*/
static int tr_rebuild_header(struct sk_buff *skb)
{
struct trh_hdr *trh=(struct trh_hdr *)skb->data;
struct trllc *trllc=(struct trllc *)(skb->data+sizeof(struct trh_hdr));
struct net_device *dev = skb->dev;
/*
* FIXME: We don't yet support IPv6 over token rings
*/
if(trllc->ethertype != htons(ETH_P_IP)) {
printk("tr_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(trllc->ethertype));
return 0;
}
#ifdef CONFIG_INET
if(arp_find(trh->daddr, skb)) {
return 1;
}
else
#endif
{
tr_source_route(skb,trh,dev);
return 0;
}
}
/*
* Some of this is a bit hackish. We intercept RIF information
* used for source routing. We also grab IP directly and don't feed
* it via SNAP.
*/
__be16 tr_type_trans(struct sk_buff *skb, struct net_device *dev)
{
struct trh_hdr *trh;
struct trllc *trllc;
unsigned riflen=0;
skb->dev = dev;
skb_reset_mac_header(skb);
trh = tr_hdr(skb);
if(trh->saddr[0] & TR_RII)
riflen = (ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8;
trllc = (struct trllc *)(skb->data+sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
skb_pull(skb,sizeof(struct trh_hdr)-TR_MAXRIFLEN+riflen);
if(*trh->daddr & 0x80)
{
if(!memcmp(trh->daddr,dev->broadcast,TR_ALEN))
skb->pkt_type=PACKET_BROADCAST;
else
skb->pkt_type=PACKET_MULTICAST;
}
else if ( (trh->daddr[0] & 0x01) && (trh->daddr[1] & 0x00) && (trh->daddr[2] & 0x5E))
{
skb->pkt_type=PACKET_MULTICAST;
}
else if(dev->flags & IFF_PROMISC)
{
if(memcmp(trh->daddr, dev->dev_addr, TR_ALEN))
skb->pkt_type=PACKET_OTHERHOST;
}
if ((skb->pkt_type != PACKET_BROADCAST) &&
(skb->pkt_type != PACKET_MULTICAST
|