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linux/net/decnet/dn_neigh.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

621 lines
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// 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_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 > ((struct dn_neigh *)dn_db->router)->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,
};
static int dn_neigh_seq_open(struct inode *inode, struct file *file)
{
return seq_open_net(inode, file, &dn_neigh_seq_ops,
sizeof(struct neigh_seq_state));
}
static const struct file_operations dn_neigh_seq_fops = {
.owner = THIS_MODULE,
.open = dn_neigh_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_net,
};
#endif
void __init dn_neigh_init(void)
{
neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table);
proc_create("decnet_neigh", S_IRUGO, init_net.proc_net,
&dn_neigh_seq_fops);
}
void __exit dn_neigh_cleanup(void)
{
remove_proc_entry("decnet_neigh", init_net.proc_net);
neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table);
}
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