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Diffstat (limited to 'net/decnet/dn_neigh.c')
-rw-r--r--net/decnet/dn_neigh.c607
1 files changed, 0 insertions, 607 deletions
diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c
deleted file mode 100644
index 7c569bcc0aca..000000000000
--- a/net/decnet/dn_neigh.c
+++ /dev/null
@@ -1,607 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * DECnet An implementation of the DECnet protocol suite for the LINUX
- * operating system. DECnet is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * DECnet Neighbour Functions (Adjacency Database and
- * On-Ethernet Cache)
- *
- * Author: Steve Whitehouse <SteveW@ACM.org>
- *
- *
- * Changes:
- * Steve Whitehouse : Fixed router listing routine
- * Steve Whitehouse : Added error_report functions
- * Steve Whitehouse : Added default router detection
- * Steve Whitehouse : Hop counts in outgoing messages
- * Steve Whitehouse : Fixed src/dst in outgoing messages so
- * forwarding now stands a good chance of
- * working.
- * Steve Whitehouse : Fixed neighbour states (for now anyway).
- * Steve Whitehouse : Made error_report functions dummies. This
- * is not the right place to return skbs.
- * Steve Whitehouse : Convert to seq_file
- *
- */
-
-#include <linux/net.h>
-#include <linux/module.h>
-#include <linux/socket.h>
-#include <linux/if_arp.h>
-#include <linux/slab.h>
-#include <linux/if_ether.h>
-#include <linux/init.h>
-#include <linux/proc_fs.h>
-#include <linux/string.h>
-#include <linux/netfilter_decnet.h>
-#include <linux/spinlock.h>
-#include <linux/seq_file.h>
-#include <linux/rcupdate.h>
-#include <linux/jhash.h>
-#include <linux/atomic.h>
-#include <net/net_namespace.h>
-#include <net/neighbour.h>
-#include <net/dst.h>
-#include <net/flow.h>
-#include <net/dn.h>
-#include <net/dn_dev.h>
-#include <net/dn_neigh.h>
-#include <net/dn_route.h>
-
-static int dn_neigh_construct(struct neighbour *);
-static void dn_neigh_error_report(struct neighbour *, struct sk_buff *);
-static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb);
-
-/*
- * Operations for adding the link layer header.
- */
-static const struct neigh_ops dn_neigh_ops = {
- .family = AF_DECnet,
- .error_report = dn_neigh_error_report,
- .output = dn_neigh_output,
- .connected_output = dn_neigh_output,
-};
-
-static u32 dn_neigh_hash(const void *pkey,
- const struct net_device *dev,
- __u32 *hash_rnd)
-{
- return jhash_2words(*(__u16 *)pkey, 0, hash_rnd[0]);
-}
-
-static bool dn_key_eq(const struct neighbour *neigh, const void *pkey)
-{
- return neigh_key_eq16(neigh, pkey);
-}
-
-struct neigh_table dn_neigh_table = {
- .family = PF_DECnet,
- .entry_size = NEIGH_ENTRY_SIZE(sizeof(struct dn_neigh)),
- .key_len = sizeof(__le16),
- .protocol = cpu_to_be16(ETH_P_DNA_RT),
- .hash = dn_neigh_hash,
- .key_eq = dn_key_eq,
- .constructor = dn_neigh_construct,
- .id = "dn_neigh_cache",
- .parms ={
- .tbl = &dn_neigh_table,
- .reachable_time = 30 * HZ,
- .data = {
- [NEIGH_VAR_MCAST_PROBES] = 0,
- [NEIGH_VAR_UCAST_PROBES] = 0,
- [NEIGH_VAR_APP_PROBES] = 0,
- [NEIGH_VAR_RETRANS_TIME] = 1 * HZ,
- [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ,
- [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
- [NEIGH_VAR_INTERVAL_PROBE_TIME_MS] = 5 * HZ,
- [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
- [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
- [NEIGH_VAR_PROXY_QLEN] = 0,
- [NEIGH_VAR_ANYCAST_DELAY] = 0,
- [NEIGH_VAR_PROXY_DELAY] = 0,
- [NEIGH_VAR_LOCKTIME] = 1 * HZ,
- },
- },
- .gc_interval = 30 * HZ,
- .gc_thresh1 = 128,
- .gc_thresh2 = 512,
- .gc_thresh3 = 1024,
-};
-
-static int dn_neigh_construct(struct neighbour *neigh)
-{
- struct net_device *dev = neigh->dev;
- struct dn_neigh *dn = container_of(neigh, struct dn_neigh, n);
- struct dn_dev *dn_db;
- struct neigh_parms *parms;
-
- rcu_read_lock();
- dn_db = rcu_dereference(dev->dn_ptr);
- if (dn_db == NULL) {
- rcu_read_unlock();
- return -EINVAL;
- }
-
- parms = dn_db->neigh_parms;
- if (!parms) {
- rcu_read_unlock();
- return -EINVAL;
- }
-
- __neigh_parms_put(neigh->parms);
- neigh->parms = neigh_parms_clone(parms);
- rcu_read_unlock();
-
- neigh->ops = &dn_neigh_ops;
- neigh->nud_state = NUD_NOARP;
- neigh->output = neigh->ops->connected_output;
-
- if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT))
- memcpy(neigh->ha, dev->broadcast, dev->addr_len);
- else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK))
- dn_dn2eth(neigh->ha, dn->addr);
- else {
- net_dbg_ratelimited("Trying to create neigh for hw %d\n",
- dev->type);
- return -EINVAL;
- }
-
- /*
- * Make an estimate of the remote block size by assuming that its
- * two less then the device mtu, which it true for ethernet (and
- * other things which support long format headers) since there is
- * an extra length field (of 16 bits) which isn't part of the
- * ethernet headers and which the DECnet specs won't admit is part
- * of the DECnet routing headers either.
- *
- * If we over estimate here its no big deal, the NSP negotiations
- * will prevent us from sending packets which are too large for the
- * remote node to handle. In any case this figure is normally updated
- * by a hello message in most cases.
- */
- dn->blksize = dev->mtu - 2;
-
- return 0;
-}
-
-static void dn_neigh_error_report(struct neighbour *neigh, struct sk_buff *skb)
-{
- printk(KERN_DEBUG "dn_neigh_error_report: called\n");
- kfree_skb(skb);
-}
-
-static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb)
-{
- struct dst_entry *dst = skb_dst(skb);
- struct dn_route *rt = (struct dn_route *)dst;
- struct net_device *dev = neigh->dev;
- char mac_addr[ETH_ALEN];
- unsigned int seq;
- int err;
-
- dn_dn2eth(mac_addr, rt->rt_local_src);
- do {
- seq = read_seqbegin(&neigh->ha_lock);
- err = dev_hard_header(skb, dev, ntohs(skb->protocol),
- neigh->ha, mac_addr, skb->len);
- } while (read_seqretry(&neigh->ha_lock, seq));
-
- if (err >= 0)
- err = dev_queue_xmit(skb);
- else {
- kfree_skb(skb);
- err = -EINVAL;
- }
- return err;
-}
-
-static int dn_neigh_output_packet(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
- struct dst_entry *dst = skb_dst(skb);
- struct dn_route *rt = (struct dn_route *)dst;
- struct neighbour *neigh = rt->n;
-
- return neigh->output(neigh, skb);
-}
-
-/*
- * For talking to broadcast devices: Ethernet & PPP
- */
-static int dn_long_output(struct neighbour *neigh, struct sock *sk,
- struct sk_buff *skb)
-{
- struct net_device *dev = neigh->dev;
- int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
- unsigned char *data;
- struct dn_long_packet *lp;
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
-
-
- if (skb_headroom(skb) < headroom) {
- struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
- if (skb2 == NULL) {
- net_crit_ratelimited("dn_long_output: no memory\n");
- kfree_skb(skb);
- return -ENOBUFS;
- }
- consume_skb(skb);
- skb = skb2;
- net_info_ratelimited("dn_long_output: Increasing headroom\n");
- }
-
- data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
- lp = (struct dn_long_packet *)(data+3);
-
- *((__le16 *)data) = cpu_to_le16(skb->len - 2);
- *(data + 2) = 1 | DN_RT_F_PF; /* Padding */
-
- lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
- lp->d_area = lp->d_subarea = 0;
- dn_dn2eth(lp->d_id, cb->dst);
- lp->s_area = lp->s_subarea = 0;
- dn_dn2eth(lp->s_id, cb->src);
- lp->nl2 = 0;
- lp->visit_ct = cb->hops & 0x3f;
- lp->s_class = 0;
- lp->pt = 0;
-
- skb_reset_network_header(skb);
-
- return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING,
- &init_net, sk, skb, NULL, neigh->dev,
- dn_neigh_output_packet);
-}
-
-/*
- * For talking to pointopoint and multidrop devices: DDCMP and X.25
- */
-static int dn_short_output(struct neighbour *neigh, struct sock *sk,
- struct sk_buff *skb)
-{
- struct net_device *dev = neigh->dev;
- int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
- struct dn_short_packet *sp;
- unsigned char *data;
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
-
-
- if (skb_headroom(skb) < headroom) {
- struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
- if (skb2 == NULL) {
- net_crit_ratelimited("dn_short_output: no memory\n");
- kfree_skb(skb);
- return -ENOBUFS;
- }
- consume_skb(skb);
- skb = skb2;
- net_info_ratelimited("dn_short_output: Increasing headroom\n");
- }
-
- data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
- *((__le16 *)data) = cpu_to_le16(skb->len - 2);
- sp = (struct dn_short_packet *)(data+2);
-
- sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
- sp->dstnode = cb->dst;
- sp->srcnode = cb->src;
- sp->forward = cb->hops & 0x3f;
-
- skb_reset_network_header(skb);
-
- return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING,
- &init_net, sk, skb, NULL, neigh->dev,
- dn_neigh_output_packet);
-}
-
-/*
- * For talking to DECnet phase III nodes
- * Phase 3 output is the same as short output, execpt that
- * it clears the area bits before transmission.
- */
-static int dn_phase3_output(struct neighbour *neigh, struct sock *sk,
- struct sk_buff *skb)
-{
- struct net_device *dev = neigh->dev;
- int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
- struct dn_short_packet *sp;
- unsigned char *data;
- struct dn_skb_cb *cb = DN_SKB_CB(skb);
-
- if (skb_headroom(skb) < headroom) {
- struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
- if (skb2 == NULL) {
- net_crit_ratelimited("dn_phase3_output: no memory\n");
- kfree_skb(skb);
- return -ENOBUFS;
- }
- consume_skb(skb);
- skb = skb2;
- net_info_ratelimited("dn_phase3_output: Increasing headroom\n");
- }
-
- data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
- *((__le16 *)data) = cpu_to_le16(skb->len - 2);
- sp = (struct dn_short_packet *)(data + 2);
-
- sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
- sp->dstnode = cb->dst & cpu_to_le16(0x03ff);
- sp->srcnode = cb->src & cpu_to_le16(0x03ff);
- sp->forward = cb->hops & 0x3f;
-
- skb_reset_network_header(skb);
-
- return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING,
- &init_net, sk, skb, NULL, neigh->dev,
- dn_neigh_output_packet);
-}
-
-int dn_to_neigh_output(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
- struct dst_entry *dst = skb_dst(skb);
- struct dn_route *rt = (struct dn_route *) dst;
- struct neighbour *neigh = rt->n;
- struct dn_neigh *dn = container_of(neigh, struct dn_neigh, n);
- struct dn_dev *dn_db;
- bool use_long;
-
- rcu_read_lock();
- dn_db = rcu_dereference(neigh->dev->dn_ptr);
- if (dn_db == NULL) {
- rcu_read_unlock();
- return -EINVAL;
- }
- use_long = dn_db->use_long;
- rcu_read_unlock();
-
- if (dn->flags & DN_NDFLAG_P3)
- return dn_phase3_output(neigh, sk, skb);
- if (use_long)
- return dn_long_output(neigh, sk, skb);
- else
- return dn_short_output(neigh, sk, skb);
-}
-
-/*
- * Unfortunately, the neighbour code uses the device in its hash
- * function, so we don't get any advantage from it. This function
- * basically does a neigh_lookup(), but without comparing the device
- * field. This is required for the On-Ethernet cache
- */
-
-/*
- * Pointopoint link receives a hello message
- */
-void dn_neigh_pointopoint_hello(struct sk_buff *skb)
-{
- kfree_skb(skb);
-}
-
-/*
- * Ethernet router hello message received
- */
-int dn_neigh_router_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
- struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
-
- struct neighbour *neigh;
- struct dn_neigh *dn;
- struct dn_dev *dn_db;
- __le16 src;
-
- src = dn_eth2dn(msg->id);
-
- neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
-
- dn = container_of(neigh, struct dn_neigh, n);
-
- if (neigh) {
- write_lock(&neigh->lock);
-
- neigh->used = jiffies;
- dn_db = rcu_dereference(neigh->dev->dn_ptr);
-
- if (!(neigh->nud_state & NUD_PERMANENT)) {
- neigh->updated = jiffies;
-
- if (neigh->dev->type == ARPHRD_ETHER)
- memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
-
- dn->blksize = le16_to_cpu(msg->blksize);
- dn->priority = msg->priority;
-
- dn->flags &= ~DN_NDFLAG_P3;
-
- switch (msg->iinfo & DN_RT_INFO_TYPE) {
- case DN_RT_INFO_L1RT:
- dn->flags &=~DN_NDFLAG_R2;
- dn->flags |= DN_NDFLAG_R1;
- break;
- case DN_RT_INFO_L2RT:
- dn->flags |= DN_NDFLAG_R2;
- }
- }
-
- /* Only use routers in our area */
- if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) {
- if (!dn_db->router) {
- dn_db->router = neigh_clone(neigh);
- } else {
- if (msg->priority > container_of(dn_db->router,
- struct dn_neigh, n)->priority)
- neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
- }
- }
- write_unlock(&neigh->lock);
- neigh_release(neigh);
- }
-
- kfree_skb(skb);
- return 0;
-}
-
-/*
- * Endnode hello message received
- */
-int dn_neigh_endnode_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
-{
- struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
- struct neighbour *neigh;
- struct dn_neigh *dn;
- __le16 src;
-
- src = dn_eth2dn(msg->id);
-
- neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
-
- dn = container_of(neigh, struct dn_neigh, n);
-
- if (neigh) {
- write_lock(&neigh->lock);
-
- neigh->used = jiffies;
-
- if (!(neigh->nud_state & NUD_PERMANENT)) {
- neigh->updated = jiffies;
-
- if (neigh->dev->type == ARPHRD_ETHER)
- memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
- dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
- dn->blksize = le16_to_cpu(msg->blksize);
- dn->priority = 0;
- }
-
- write_unlock(&neigh->lock);
- neigh_release(neigh);
- }
-
- kfree_skb(skb);
- return 0;
-}
-
-static char *dn_find_slot(char *base, int max, int priority)
-{
- int i;
- unsigned char *min = NULL;
-
- base += 6; /* skip first id */
-
- for(i = 0; i < max; i++) {
- if (!min || (*base < *min))
- min = base;
- base += 7; /* find next priority */
- }
-
- if (!min)
- return NULL;
-
- return (*min < priority) ? (min - 6) : NULL;
-}
-
-struct elist_cb_state {
- struct net_device *dev;
- unsigned char *ptr;
- unsigned char *rs;
- 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 = container_of(neigh, struct dn_neigh, n);
- 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 = container_of(n, 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(le16_to_cpu(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,
- refcount_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 const 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,
-};
-#endif
-
-void __init dn_neigh_init(void)
-{
- neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table);
- proc_create_net("decnet_neigh", 0444, init_net.proc_net,
- &dn_neigh_seq_ops, sizeof(struct neigh_seq_state));
-}
-
-void __exit dn_neigh_cleanup(void)
-{
- remove_proc_entry("decnet_neigh", init_net.proc_net);
- neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table);
-}