623 lines
16 KiB
C
623 lines
16 KiB
C
/*
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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* operating system. DECnet is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* DECnet Neighbour Functions (Adjacency Database and
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* On-Ethernet Cache)
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*
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* Author: Steve Whitehouse <SteveW@ACM.org>
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*
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*
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* Changes:
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* Steve Whitehouse : Fixed router listing routine
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* Steve Whitehouse : Added error_report functions
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* Steve Whitehouse : Added default router detection
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* Steve Whitehouse : Hop counts in outgoing messages
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* Steve Whitehouse : Fixed src/dst in outgoing messages so
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* forwarding now stands a good chance of
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* working.
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* Steve Whitehouse : Fixed neighbour states (for now anyway).
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* Steve Whitehouse : Made error_report functions dummies. This
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* is not the right place to return skbs.
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* Steve Whitehouse : Convert to seq_file
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*
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*/
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#include <linux/net.h>
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#include <linux/module.h>
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#include <linux/socket.h>
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#include <linux/if_arp.h>
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#include <linux/if_ether.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/string.h>
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#include <linux/netfilter_decnet.h>
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#include <linux/spinlock.h>
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#include <linux/seq_file.h>
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#include <linux/rcupdate.h>
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#include <linux/jhash.h>
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#include <asm/atomic.h>
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#include <net/neighbour.h>
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#include <net/dst.h>
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#include <net/flow.h>
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#include <net/dn.h>
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#include <net/dn_dev.h>
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#include <net/dn_neigh.h>
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#include <net/dn_route.h>
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static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev);
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static int dn_neigh_construct(struct neighbour *);
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static void dn_long_error_report(struct neighbour *, struct sk_buff *);
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static void dn_short_error_report(struct neighbour *, struct sk_buff *);
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static int dn_long_output(struct sk_buff *);
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static int dn_short_output(struct sk_buff *);
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static int dn_phase3_output(struct sk_buff *);
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/*
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* For talking to broadcast devices: Ethernet & PPP
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*/
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static struct neigh_ops dn_long_ops = {
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.family = AF_DECnet,
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.error_report = dn_long_error_report,
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.output = dn_long_output,
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.connected_output = dn_long_output,
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.hh_output = dev_queue_xmit,
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.queue_xmit = dev_queue_xmit,
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};
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/*
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* For talking to pointopoint and multidrop devices: DDCMP and X.25
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*/
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static struct neigh_ops dn_short_ops = {
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.family = AF_DECnet,
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.error_report = dn_short_error_report,
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.output = dn_short_output,
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.connected_output = dn_short_output,
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.hh_output = dev_queue_xmit,
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.queue_xmit = dev_queue_xmit,
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};
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/*
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* For talking to DECnet phase III nodes
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*/
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static struct neigh_ops dn_phase3_ops = {
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.family = AF_DECnet,
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.error_report = dn_short_error_report, /* Can use short version here */
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.output = dn_phase3_output,
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.connected_output = dn_phase3_output,
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.hh_output = dev_queue_xmit,
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.queue_xmit = dev_queue_xmit
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};
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struct neigh_table dn_neigh_table = {
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.family = PF_DECnet,
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.entry_size = sizeof(struct dn_neigh),
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.key_len = sizeof(__le16),
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.hash = dn_neigh_hash,
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.constructor = dn_neigh_construct,
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.id = "dn_neigh_cache",
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.parms ={
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.tbl = &dn_neigh_table,
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.base_reachable_time = 30 * HZ,
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.retrans_time = 1 * HZ,
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.gc_staletime = 60 * HZ,
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.reachable_time = 30 * HZ,
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.delay_probe_time = 5 * HZ,
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.queue_len = 3,
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.ucast_probes = 0,
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.app_probes = 0,
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.mcast_probes = 0,
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.anycast_delay = 0,
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.proxy_delay = 0,
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.proxy_qlen = 0,
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.locktime = 1 * HZ,
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},
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.gc_interval = 30 * HZ,
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.gc_thresh1 = 128,
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.gc_thresh2 = 512,
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.gc_thresh3 = 1024,
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};
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static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev)
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{
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return jhash_2words(*(__u16 *)pkey, 0, dn_neigh_table.hash_rnd);
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}
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static int dn_neigh_construct(struct neighbour *neigh)
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{
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struct net_device *dev = neigh->dev;
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struct dn_neigh *dn = (struct dn_neigh *)neigh;
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struct dn_dev *dn_db;
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struct neigh_parms *parms;
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rcu_read_lock();
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dn_db = rcu_dereference(dev->dn_ptr);
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if (dn_db == NULL) {
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rcu_read_unlock();
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return -EINVAL;
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}
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parms = dn_db->neigh_parms;
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if (!parms) {
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rcu_read_unlock();
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return -EINVAL;
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}
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__neigh_parms_put(neigh->parms);
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neigh->parms = neigh_parms_clone(parms);
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if (dn_db->use_long)
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neigh->ops = &dn_long_ops;
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else
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neigh->ops = &dn_short_ops;
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rcu_read_unlock();
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if (dn->flags & DN_NDFLAG_P3)
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neigh->ops = &dn_phase3_ops;
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neigh->nud_state = NUD_NOARP;
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neigh->output = neigh->ops->connected_output;
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if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT))
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memcpy(neigh->ha, dev->broadcast, dev->addr_len);
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else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK))
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dn_dn2eth(neigh->ha, dn->addr);
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else {
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if (net_ratelimit())
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printk(KERN_DEBUG "Trying to create neigh for hw %d\n", dev->type);
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return -EINVAL;
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}
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/*
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* Make an estimate of the remote block size by assuming that its
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* two less then the device mtu, which it true for ethernet (and
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* other things which support long format headers) since there is
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* an extra length field (of 16 bits) which isn't part of the
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* ethernet headers and which the DECnet specs won't admit is part
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* of the DECnet routing headers either.
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*
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* If we over estimate here its no big deal, the NSP negotiations
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* will prevent us from sending packets which are too large for the
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* remote node to handle. In any case this figure is normally updated
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* by a hello message in most cases.
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*/
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dn->blksize = dev->mtu - 2;
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return 0;
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}
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static void dn_long_error_report(struct neighbour *neigh, struct sk_buff *skb)
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{
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printk(KERN_DEBUG "dn_long_error_report: called\n");
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kfree_skb(skb);
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}
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static void dn_short_error_report(struct neighbour *neigh, struct sk_buff *skb)
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{
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printk(KERN_DEBUG "dn_short_error_report: called\n");
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kfree_skb(skb);
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}
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static int dn_neigh_output_packet(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb->dst;
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struct dn_route *rt = (struct dn_route *)dst;
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struct neighbour *neigh = dst->neighbour;
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struct net_device *dev = neigh->dev;
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char mac_addr[ETH_ALEN];
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dn_dn2eth(mac_addr, rt->rt_local_src);
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if (!dev->hard_header || dev->hard_header(skb, dev, ntohs(skb->protocol), neigh->ha, mac_addr, skb->len) >= 0)
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return neigh->ops->queue_xmit(skb);
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if (net_ratelimit())
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printk(KERN_DEBUG "dn_neigh_output_packet: oops, can't send packet\n");
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kfree_skb(skb);
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return -EINVAL;
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}
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static int dn_long_output(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb->dst;
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struct neighbour *neigh = dst->neighbour;
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struct net_device *dev = neigh->dev;
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int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
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unsigned char *data;
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struct dn_long_packet *lp;
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struct dn_skb_cb *cb = DN_SKB_CB(skb);
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if (skb_headroom(skb) < headroom) {
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struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
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if (skb2 == NULL) {
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if (net_ratelimit())
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printk(KERN_CRIT "dn_long_output: no memory\n");
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kfree_skb(skb);
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return -ENOBUFS;
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}
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kfree_skb(skb);
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skb = skb2;
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if (net_ratelimit())
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printk(KERN_INFO "dn_long_output: Increasing headroom\n");
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}
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data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
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lp = (struct dn_long_packet *)(data+3);
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*((__le16 *)data) = dn_htons(skb->len - 2);
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*(data + 2) = 1 | DN_RT_F_PF; /* Padding */
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lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
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lp->d_area = lp->d_subarea = 0;
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dn_dn2eth(lp->d_id, cb->dst);
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lp->s_area = lp->s_subarea = 0;
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dn_dn2eth(lp->s_id, cb->src);
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lp->nl2 = 0;
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lp->visit_ct = cb->hops & 0x3f;
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lp->s_class = 0;
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lp->pt = 0;
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skb->nh.raw = skb->data;
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return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
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}
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static int dn_short_output(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb->dst;
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struct neighbour *neigh = dst->neighbour;
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struct net_device *dev = neigh->dev;
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int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
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struct dn_short_packet *sp;
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unsigned char *data;
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struct dn_skb_cb *cb = DN_SKB_CB(skb);
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if (skb_headroom(skb) < headroom) {
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struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
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if (skb2 == NULL) {
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if (net_ratelimit())
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printk(KERN_CRIT "dn_short_output: no memory\n");
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kfree_skb(skb);
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return -ENOBUFS;
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}
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kfree_skb(skb);
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skb = skb2;
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if (net_ratelimit())
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printk(KERN_INFO "dn_short_output: Increasing headroom\n");
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}
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data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
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*((__le16 *)data) = dn_htons(skb->len - 2);
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sp = (struct dn_short_packet *)(data+2);
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sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
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sp->dstnode = cb->dst;
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sp->srcnode = cb->src;
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sp->forward = cb->hops & 0x3f;
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skb->nh.raw = skb->data;
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return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
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}
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/*
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* Phase 3 output is the same is short output, execpt that
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* it clears the area bits before transmission.
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*/
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static int dn_phase3_output(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb->dst;
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struct neighbour *neigh = dst->neighbour;
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struct net_device *dev = neigh->dev;
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int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
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struct dn_short_packet *sp;
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unsigned char *data;
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struct dn_skb_cb *cb = DN_SKB_CB(skb);
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if (skb_headroom(skb) < headroom) {
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struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
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if (skb2 == NULL) {
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if (net_ratelimit())
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printk(KERN_CRIT "dn_phase3_output: no memory\n");
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kfree_skb(skb);
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return -ENOBUFS;
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}
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kfree_skb(skb);
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skb = skb2;
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if (net_ratelimit())
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printk(KERN_INFO "dn_phase3_output: Increasing headroom\n");
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}
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data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
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*((__le16 *)data) = dn_htons(skb->len - 2);
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sp = (struct dn_short_packet *)(data + 2);
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sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
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sp->dstnode = cb->dst & dn_htons(0x03ff);
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sp->srcnode = cb->src & dn_htons(0x03ff);
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sp->forward = cb->hops & 0x3f;
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skb->nh.raw = skb->data;
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return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
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}
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/*
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* Unfortunately, the neighbour code uses the device in its hash
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* function, so we don't get any advantage from it. This function
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* basically does a neigh_lookup(), but without comparing the device
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* field. This is required for the On-Ethernet cache
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*/
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/*
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* Pointopoint link receives a hello message
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*/
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void dn_neigh_pointopoint_hello(struct sk_buff *skb)
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{
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kfree_skb(skb);
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}
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/*
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* Ethernet router hello message received
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*/
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int dn_neigh_router_hello(struct sk_buff *skb)
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{
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struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
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struct neighbour *neigh;
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struct dn_neigh *dn;
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struct dn_dev *dn_db;
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__le16 src;
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src = dn_eth2dn(msg->id);
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neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
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dn = (struct dn_neigh *)neigh;
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if (neigh) {
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write_lock(&neigh->lock);
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neigh->used = jiffies;
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dn_db = (struct dn_dev *)neigh->dev->dn_ptr;
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if (!(neigh->nud_state & NUD_PERMANENT)) {
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neigh->updated = jiffies;
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if (neigh->dev->type == ARPHRD_ETHER)
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memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN);
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dn->blksize = dn_ntohs(msg->blksize);
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dn->priority = msg->priority;
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dn->flags &= ~DN_NDFLAG_P3;
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switch(msg->iinfo & DN_RT_INFO_TYPE) {
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case DN_RT_INFO_L1RT:
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dn->flags &=~DN_NDFLAG_R2;
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dn->flags |= DN_NDFLAG_R1;
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break;
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case DN_RT_INFO_L2RT:
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dn->flags |= DN_NDFLAG_R2;
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}
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}
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/* Only use routers in our area */
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if ((dn_ntohs(src)>>10) == (dn_ntohs((decnet_address))>>10)) {
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if (!dn_db->router) {
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dn_db->router = neigh_clone(neigh);
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} else {
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if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
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neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
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}
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}
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write_unlock(&neigh->lock);
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neigh_release(neigh);
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}
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kfree_skb(skb);
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return 0;
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}
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|
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/*
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* Endnode hello message received
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*/
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int dn_neigh_endnode_hello(struct sk_buff *skb)
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{
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struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
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struct neighbour *neigh;
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struct dn_neigh *dn;
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__le16 src;
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src = dn_eth2dn(msg->id);
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neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
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dn = (struct dn_neigh *)neigh;
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if (neigh) {
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write_lock(&neigh->lock);
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neigh->used = jiffies;
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if (!(neigh->nud_state & NUD_PERMANENT)) {
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neigh->updated = jiffies;
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if (neigh->dev->type == ARPHRD_ETHER)
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memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN);
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dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
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dn->blksize = dn_ntohs(msg->blksize);
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dn->priority = 0;
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}
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write_unlock(&neigh->lock);
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neigh_release(neigh);
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}
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|
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kfree_skb(skb);
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return 0;
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}
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|
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static char *dn_find_slot(char *base, int max, int priority)
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{
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int i;
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unsigned char *min = NULL;
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|
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base += 6; /* skip first id */
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|
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for(i = 0; i < max; i++) {
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if (!min || (*base < *min))
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min = base;
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base += 7; /* find next priority */
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}
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|
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if (!min)
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return NULL;
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|
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return (*min < priority) ? (min - 6) : NULL;
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}
|
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|
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struct elist_cb_state {
|
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struct net_device *dev;
|
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unsigned char *ptr;
|
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unsigned char *rs;
|
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int t, n;
|
|
};
|
|
|
|
static void neigh_elist_cb(struct neighbour *neigh, void *_info)
|
|
{
|
|
struct elist_cb_state *s = _info;
|
|
struct dn_neigh *dn;
|
|
|
|
if (neigh->dev != s->dev)
|
|
return;
|
|
|
|
dn = (struct dn_neigh *) neigh;
|
|
if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2)))
|
|
return;
|
|
|
|
if (s->t == s->n)
|
|
s->rs = dn_find_slot(s->ptr, s->n, dn->priority);
|
|
else
|
|
s->t++;
|
|
if (s->rs == NULL)
|
|
return;
|
|
|
|
dn_dn2eth(s->rs, dn->addr);
|
|
s->rs += 6;
|
|
*(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0;
|
|
*(s->rs) |= dn->priority;
|
|
s->rs++;
|
|
}
|
|
|
|
int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n)
|
|
{
|
|
struct elist_cb_state state;
|
|
|
|
state.dev = dev;
|
|
state.t = 0;
|
|
state.n = n;
|
|
state.ptr = ptr;
|
|
state.rs = ptr;
|
|
|
|
neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state);
|
|
|
|
return state.t;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static inline void dn_neigh_format_entry(struct seq_file *seq,
|
|
struct neighbour *n)
|
|
{
|
|
struct dn_neigh *dn = (struct dn_neigh *) n;
|
|
char buf[DN_ASCBUF_LEN];
|
|
|
|
read_lock(&n->lock);
|
|
seq_printf(seq, "%-7s %s%s%s %02x %02d %07ld %-8s\n",
|
|
dn_addr2asc(dn_ntohs(dn->addr), buf),
|
|
(dn->flags&DN_NDFLAG_R1) ? "1" : "-",
|
|
(dn->flags&DN_NDFLAG_R2) ? "2" : "-",
|
|
(dn->flags&DN_NDFLAG_P3) ? "3" : "-",
|
|
dn->n.nud_state,
|
|
atomic_read(&dn->n.refcnt),
|
|
dn->blksize,
|
|
(dn->n.dev) ? dn->n.dev->name : "?");
|
|
read_unlock(&n->lock);
|
|
}
|
|
|
|
static int dn_neigh_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(seq, "Addr Flags State Use Blksize Dev\n");
|
|
} else {
|
|
dn_neigh_format_entry(seq, v);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
return neigh_seq_start(seq, pos, &dn_neigh_table,
|
|
NEIGH_SEQ_NEIGH_ONLY);
|
|
}
|
|
|
|
static struct seq_operations dn_neigh_seq_ops = {
|
|
.start = dn_neigh_seq_start,
|
|
.next = neigh_seq_next,
|
|
.stop = neigh_seq_stop,
|
|
.show = dn_neigh_seq_show,
|
|
};
|
|
|
|
static int dn_neigh_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq;
|
|
int rc = -ENOMEM;
|
|
struct neigh_seq_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
|
|
|
|
if (!s)
|
|
goto out;
|
|
|
|
rc = seq_open(file, &dn_neigh_seq_ops);
|
|
if (rc)
|
|
goto out_kfree;
|
|
|
|
seq = file->private_data;
|
|
seq->private = s;
|
|
memset(s, 0, sizeof(*s));
|
|
out:
|
|
return rc;
|
|
out_kfree:
|
|
kfree(s);
|
|
goto out;
|
|
}
|
|
|
|
static struct file_operations dn_neigh_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = dn_neigh_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
};
|
|
|
|
#endif
|
|
|
|
void __init dn_neigh_init(void)
|
|
{
|
|
neigh_table_init(&dn_neigh_table);
|
|
proc_net_fops_create("decnet_neigh", S_IRUGO, &dn_neigh_seq_fops);
|
|
}
|
|
|
|
void __exit dn_neigh_cleanup(void)
|
|
{
|
|
proc_net_remove("decnet_neigh");
|
|
neigh_table_clear(&dn_neigh_table);
|
|
}
|