summaryrefslogtreecommitdiff
path: root/net/802/tr.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/802/tr.c')
-rw-r--r--net/802/tr.c676
1 files changed, 0 insertions, 676 deletions
diff --git a/net/802/tr.c b/net/802/tr.c
deleted file mode 100644
index b9a3a145e34..00000000000
--- a/net/802/tr.c
+++ /dev/null
@@ -1,676 +0,0 @@
-/*
- * 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 <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 <linux/slab.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))
- tr_add_rif_info(trh,dev) ;
-
- /*
- * Strip the SNAP header from ARP packets since we don't
- * pass them through to the 802.2/SNAP layers.
- */
-
- if (trllc->dsap == EXTENDED_SAP &&
- (trllc->ethertype == htons(ETH_P_IP) ||
- trllc->ethertype == htons(ETH_P_IPV6) ||
- trllc->ethertype == htons(ETH_P_ARP)))
- {
- skb_pull(skb, sizeof(struct trllc));
- return trllc->ethertype;
- }
-
- return htons(ETH_P_TR_802_2);
-}
-
-/*
- * We try to do source routing...
- */
-
-void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,
- struct net_device *dev)
-{
- int slack;
- unsigned int hash;
- struct rif_cache *entry;
- unsigned char *olddata;
- unsigned long flags;
- static const unsigned char mcast_func_addr[]
- = {0xC0,0x00,0x00,0x04,0x00,0x00};
-
- spin_lock_irqsave(&rif_lock, flags);
-
- /*
- * Broadcasts are single route as stated in RFC 1042
- */
- if( (!memcmp(&(trh->daddr[0]),&(dev->broadcast[0]),TR_ALEN)) ||
- (!memcmp(&(trh->daddr[0]),&(mcast_func_addr[0]), TR_ALEN)) )
- {
- trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
- | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
- trh->saddr[0]|=TR_RII;
- }
- else
- {
- hash = rif_hash(trh->daddr);
- /*
- * Walk the hash table and look for an entry
- */
- for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->daddr[0]),TR_ALEN);entry=entry->next);
-
- /*
- * If we found an entry we can route the frame.
- */
- if(entry)
- {
-#if TR_SR_DEBUG
-printk("source routing for %pM\n", trh->daddr);
-#endif
- if(!entry->local_ring && (ntohs(entry->rcf) & TR_RCF_LEN_MASK) >> 8)
- {
- trh->rcf=entry->rcf;
- memcpy(&trh->rseg[0],&entry->rseg[0],8*sizeof(unsigned short));
- trh->rcf^=htons(TR_RCF_DIR_BIT);
- trh->rcf&=htons(0x1fff); /* Issam Chehab <ichehab@madge1.demon.co.uk> */
-
- trh->saddr[0]|=TR_RII;
-#if TR_SR_DEBUG
- printk("entry found with rcf %04x\n", entry->rcf);
- }
- else
- {
- printk("entry found but without rcf length, local=%02x\n", entry->local_ring);
-#endif
- }
- entry->last_used=jiffies;
- }
- else
- {
- /*
- * Without the information we simply have to shout
- * on the wire. The replies should rapidly clean this
- * situation up.
- */
- trh->rcf=htons((((sizeof(trh->rcf)) << 8) & TR_RCF_LEN_MASK)
- | TR_RCF_FRAME2K | TR_RCF_LIMITED_BROADCAST);
- trh->saddr[0]|=TR_RII;
-#if TR_SR_DEBUG
- printk("no entry in rif table found - broadcasting frame\n");
-#endif
- }
- }
-
- /* Compress the RIF here so we don't have to do it in the driver(s) */
- if (!(trh->saddr[0] & 0x80))
- slack = 18;
- else
- slack = 18 - ((ntohs(trh->rcf) & TR_RCF_LEN_MASK)>>8);
- olddata = skb->data;
- spin_unlock_irqrestore(&rif_lock, flags);
-
- skb_pull(skb, slack);
- memmove(skb->data, olddata, sizeof(struct trh_hdr) - slack);
-}
-
-/*
- * We have learned some new RIF information for our source
- * routing.
- */
-
-static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev)
-{
- unsigned int hash, rii_p = 0;
- unsigned long flags;
- struct rif_cache *entry;
- unsigned char saddr0;
-
- spin_lock_irqsave(&rif_lock, flags);
- saddr0 = trh->saddr[0];
-
- /*
- * Firstly see if the entry exists
- */
-
- if(trh->saddr[0] & TR_RII)
- {
- trh->saddr[0]&=0x7f;
- if (((ntohs(trh->rcf) & TR_RCF_LEN_MASK) >> 8) > 2)
- {
- rii_p = 1;
- }
- }
-
- hash = rif_hash(trh->saddr);
- for(entry=rif_table[hash];entry && memcmp(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);entry=entry->next);
-
- if(entry==NULL)
- {
-#if TR_SR_DEBUG
- printk("adding rif_entry: addr:%pM rcf:%04X\n",
- trh->saddr, ntohs(trh->rcf));
-#endif
- /*
- * Allocate our new entry. A failure to allocate loses
- * use the information. This is harmless.
- *
- * FIXME: We ought to keep some kind of cache size
- * limiting and adjust the timers to suit.
- */
- entry=kmalloc(sizeof(struct rif_cache),GFP_ATOMIC);
-
- if(!entry)
- {
- printk(KERN_DEBUG "tr.c: Couldn't malloc rif cache entry !\n");
- spin_unlock_irqrestore(&rif_lock, flags);
- return;
- }
-
- memcpy(&(entry->addr[0]),&(trh->saddr[0]),TR_ALEN);
- entry->iface = dev->ifindex;
- entry->next=rif_table[hash];
- entry->last_used=jiffies;
- rif_table[hash]=entry;
-
- if (rii_p)
- {
- entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
- memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
- entry->local_ring = 0;
- }
- else
- {
- entry->local_ring = 1;
- }
- }
- else /* Y. Tahara added */
- {
- /*
- * Update existing entries
- */
- if (!entry->local_ring)
- if (entry->rcf != (trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK)) &&
- !(trh->rcf & htons(TR_RCF_BROADCAST_MASK)))
- {
-#if TR_SR_DEBUG
-printk("updating rif_entry: addr:%pM rcf:%04X\n",
- trh->saddr, ntohs(trh->rcf));
-#endif
- entry->rcf = trh->rcf & htons((unsigned short)~TR_RCF_BROADCAST_MASK);
- memcpy(&(entry->rseg[0]),&(trh->rseg[0]),8*sizeof(unsigned short));
- }
- entry->last_used=jiffies;
- }
- trh->saddr[0]=saddr0; /* put the routing indicator back for tcpdump */
- spin_unlock_irqrestore(&rif_lock, flags);
-}
-
-/*
- * Scan the cache with a timer and see what we need to throw out.
- */
-
-static void rif_check_expire(unsigned long dummy)
-{
- int i;
- unsigned long flags, next_interval = jiffies + sysctl_tr_rif_timeout/2;
-
- spin_lock_irqsave(&rif_lock, flags);
-
- for(i =0; i < RIF_TABLE_SIZE; i++) {
- struct rif_cache *entry, **pentry;
-
- pentry = rif_table+i;
- while((entry=*pentry) != NULL) {
- unsigned long expires
- = entry->last_used + sysctl_tr_rif_timeout;
-
- if (time_before_eq(expires, jiffies)) {
- *pentry = entry->next;
- kfree(entry);
- } else {
- pentry = &entry->next;
-
- if (time_before(expires, next_interval))
- next_interval = expires;
- }
- }
- }
-
- spin_unlock_irqrestore(&rif_lock, flags);
-
- mod_timer(&rif_timer, next_interval);
-
-}
-
-/*
- * Generate the /proc/net information for the token ring RIF
- * routing.
- */
-
-#ifdef CONFIG_PROC_FS
-
-static struct rif_cache *rif_get_idx(loff_t pos)
-{
- int i;
- struct rif_cache *entry;
- loff_t off = 0;
-
- for(i = 0; i < RIF_TABLE_SIZE; i++)
- for(entry = rif_table[i]; entry; entry = entry->next) {
- if (off == pos)
- return entry;
- ++off;
- }
-
- return NULL;
-}
-
-static void *rif_seq_start(struct seq_file *seq, loff_t *pos)
- __acquires(&rif_lock)
-{
- spin_lock_irq(&rif_lock);
-
- return *pos ? rif_get_idx(*pos - 1) : SEQ_START_TOKEN;
-}
-
-static void *rif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
- int i;
- struct rif_cache *ent = v;
-
- ++*pos;
-
- if (v == SEQ_START_TOKEN) {
- i = -1;
- goto scan;
- }
-
- if (ent->next)
- return ent->next;
-
- i = rif_hash(ent->addr);
- scan:
- while (++i < RIF_TABLE_SIZE) {
- if ((ent = rif_table[i]) != NULL)
- return ent;
- }
- return NULL;
-}
-
-static void rif_seq_stop(struct seq_file *seq, void *v)
- __releases(&rif_lock)
-{
- spin_unlock_irq(&rif_lock);
-}
-
-static int rif_seq_show(struct seq_file *seq, void *v)
-{
- int j, rcf_len, segment, brdgnmb;
- struct rif_cache *entry = v;
-
- if (v == SEQ_START_TOKEN)
- seq_puts(seq,
- "if TR address TTL rcf routing segments\n");
- else {
- struct net_device *dev = dev_get_by_index(&init_net, entry->iface);
- long ttl = (long) (entry->last_used + sysctl_tr_rif_timeout)
- - (long) jiffies;
-
- seq_printf(seq, "%s %pM %7li ",
- dev?dev->name:"?",
- entry->addr,
- ttl/HZ);
-
- if (entry->local_ring)
- seq_puts(seq, "local\n");
- else {
-
- seq_printf(seq, "%04X", ntohs(entry->rcf));
- rcf_len = ((ntohs(entry->rcf) & TR_RCF_LEN_MASK)>>8)-2;
- if (rcf_len)
- rcf_len >>= 1;
- for(j = 1; j < rcf_len; j++) {
- if(j==1) {
- segment=ntohs(entry->rseg[j-1])>>4;
- seq_printf(seq," %03X",segment);
- }
-
- segment=ntohs(entry->rseg[j])>>4;
- brdgnmb=ntohs(entry->rseg[j-1])&0x00f;
- seq_printf(seq,"-%01X-%03X",brdgnmb,segment);
- }
- seq_putc(seq, '\n');
- }
-
- if (dev)
- dev_put(dev);
- }
- return 0;
-}
-
-
-static const struct seq_operations rif_seq_ops = {
- .start = rif_seq_start,
- .next = rif_seq_next,
- .stop = rif_seq_stop,
- .show = rif_seq_show,
-};
-
-static int rif_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &rif_seq_ops);
-}
-
-static const struct file_operations rif_seq_fops = {
- .owner = THIS_MODULE,
- .open = rif_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-#endif
-
-static const struct header_ops tr_header_ops = {
- .create = tr_header,
- .rebuild= tr_rebuild_header,
-};
-
-static void tr_setup(struct net_device *dev)
-{
- /*
- * Configure and register
- */
-
- dev->header_ops = &tr_header_ops;
-
- dev->type = ARPHRD_IEEE802_TR;
- dev->hard_header_len = TR_HLEN;
- dev->mtu = 2000;
- dev->addr_len = TR_ALEN;
- dev->tx_queue_len = 100; /* Long queues on tr */
-
- memset(dev->broadcast,0xFF, TR_ALEN);
-
- /* New-style flags. */
- dev->flags = IFF_BROADCAST | IFF_MULTICAST ;
-}
-
-/**
- * alloc_trdev - Register token ring device
- * @sizeof_priv: Size of additional driver-private structure to be allocated
- * for this token ring device
- *
- * Fill in the fields of the device structure with token ring-generic values.
- *
- * Constructs a new net device, complete with a private data area of
- * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
- * this private data area.
- */
-struct net_device *alloc_trdev(int sizeof_priv)
-{
- return alloc_netdev(sizeof_priv, "tr%d", tr_setup);
-}
-
-#ifdef CONFIG_SYSCTL
-static struct ctl_table tr_table[] = {
- {
- .procname = "rif_timeout",
- .data = &sysctl_tr_rif_timeout,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- { },
-};
-
-static __initdata struct ctl_path tr_path[] = {
- { .procname = "net", },
- { .procname = "token-ring", },
- { }
-};
-#endif
-
-/*
- * Called during bootup. We don't actually have to initialise
- * too much for this.
- */
-
-static int __init rif_init(void)
-{
- rif_timer.expires = jiffies + sysctl_tr_rif_timeout;
- setup_timer(&rif_timer, rif_check_expire, 0);
- add_timer(&rif_timer);
-#ifdef CONFIG_SYSCTL
- register_sysctl_paths(tr_path, tr_table);
-#endif
- proc_net_fops_create(&init_net, "tr_rif", S_IRUGO, &rif_seq_fops);
- return 0;
-}
-
-module_init(rif_init);
-
-EXPORT_SYMBOL(tr_type_trans);
-EXPORT_SYMBOL(alloc_trdev);
-
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 07:37:54 +0000