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Message-Id: <1283385110-2953-1-git-send-email-xiaosuo@gmail.com>
Date: Thu, 2 Sep 2010 07:51:50 +0800
From: Changli Gao <xiaosuo@...il.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>,
"Pekka Savola (ipv6)" <pekkas@...core.fi>,
James Morris <jmorris@...ei.org>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
Changli Gao <xiaosuo@...il.com>
Subject: [PATCH] net: arp: code cleanup
Clean the code up according to Documentation/CodingStyle.
Don't initialize the variable dont_send in arp_process().
Remove the temporary varialbe flags in arp_state_to_flags().
Replace printk(KERN_DEBUG...) with pr_debug(...).
Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
1 file changed, 212 insertions(+), 228 deletions(-)
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 96c1955..cbb0e7c 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1,4 +1,5 @@
-/* linux/net/ipv4/arp.c
+/*
+ * linux/net/ipv4/arp.c
*
* Copyright (C) 1994 by Florian La Roche
*
@@ -55,7 +56,7 @@
* Stuart Cheshire : Metricom and grat arp fixes
* *** FOR 2.1 clean this up ***
* Lawrence V. Stefani: (08/12/96) Added FDDI support.
- * Alan Cox : Took the AP1000 nasty FDDI hack and
+ * Alan Cox : Took the AP1000 nasty FDDI hack and
* folded into the mainstream FDDI code.
* Ack spit, Linus how did you allow that
* one in...
@@ -120,7 +121,7 @@ EXPORT_SYMBOL(clip_tbl_hook);
#endif
#include <asm/system.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <linux/netfilter_arp.h>
@@ -173,32 +174,32 @@ const struct neigh_ops arp_broken_ops = {
EXPORT_SYMBOL(arp_broken_ops);
struct neigh_table arp_tbl = {
- .family = AF_INET,
- .entry_size = sizeof(struct neighbour) + 4,
- .key_len = 4,
- .hash = arp_hash,
- .constructor = arp_constructor,
- .proxy_redo = parp_redo,
- .id = "arp_cache",
- .parms = {
- .tbl = &arp_tbl,
- .base_reachable_time = 30 * HZ,
- .retrans_time = 1 * HZ,
- .gc_staletime = 60 * HZ,
- .reachable_time = 30 * HZ,
- .delay_probe_time = 5 * HZ,
- .queue_len = 3,
- .ucast_probes = 3,
- .mcast_probes = 3,
- .anycast_delay = 1 * HZ,
- .proxy_delay = (8 * HZ) / 10,
- .proxy_qlen = 64,
- .locktime = 1 * HZ,
+ .family = AF_INET,
+ .entry_size = sizeof(struct neighbour) + 4,
+ .key_len = 4,
+ .hash = arp_hash,
+ .constructor = arp_constructor,
+ .proxy_redo = parp_redo,
+ .id = "arp_cache",
+ .parms = {
+ .tbl = &arp_tbl,
+ .base_reachable_time = 30 * HZ,
+ .retrans_time = 1 * HZ,
+ .gc_staletime = 60 * HZ,
+ .reachable_time = 30 * HZ,
+ .delay_probe_time = 5 * HZ,
+ .queue_len = 3,
+ .ucast_probes = 3,
+ .mcast_probes = 3,
+ .anycast_delay = 1 * HZ,
+ .proxy_delay = (8 * HZ) / 10,
+ .proxy_qlen = 64,
+ .locktime = 1 * HZ,
},
- .gc_interval = 30 * HZ,
- .gc_thresh1 = 128,
- .gc_thresh2 = 512,
- .gc_thresh3 = 1024,
+ .gc_interval = 30 * HZ,
+ .gc_thresh1 = 128,
+ .gc_thresh2 = 512,
+ .gc_thresh3 = 1024,
};
EXPORT_SYMBOL(arp_tbl);
@@ -233,7 +234,7 @@ static u32 arp_hash(const void *pkey, const struct net_device *dev)
static int arp_constructor(struct neighbour *neigh)
{
- __be32 addr = *(__be32*)neigh->primary_key;
+ __be32 addr = *(__be32 *)neigh->primary_key;
struct net_device *dev = neigh->dev;
struct in_device *in_dev;
struct neigh_parms *parms;
@@ -258,31 +259,31 @@ static int arp_constructor(struct neighbour *neigh)
neigh->output = neigh->ops->queue_xmit;
} else {
/* Good devices (checked by reading texts, but only Ethernet is
- tested)
-
- ARPHRD_ETHER: (ethernet, apfddi)
- ARPHRD_FDDI: (fddi)
- ARPHRD_IEEE802: (tr)
- ARPHRD_METRICOM: (strip)
- ARPHRD_ARCNET:
- etc. etc. etc.
-
- ARPHRD_IPDDP will also work, if author repairs it.
- I did not it, because this driver does not work even
- in old paradigm.
+ * tested)
+ *
+ * ARPHRD_ETHER: (ethernet, apfddi)
+ * ARPHRD_FDDI: (fddi)
+ * ARPHRD_IEEE802: (tr)
+ * ARPHRD_METRICOM: (strip)
+ * ARPHRD_ARCNET:
+ * etc. etc. etc.
+ *
+ * ARPHRD_IPDDP will also work, if author repairs it.
+ * I did not it, because this driver does not work even
+ * in old paradigm.
*/
#if 1
/* So... these "amateur" devices are hopeless.
- The only thing, that I can say now:
- It is very sad that we need to keep ugly obsolete
- code to make them happy.
-
- They should be moved to more reasonable state, now
- they use rebuild_header INSTEAD OF hard_start_xmit!!!
- Besides that, they are sort of out of date
- (a lot of redundant clones/copies, useless in 2.1),
- I wonder why people believe that they work.
+ * The only thing, that I can say now:
+ * It is very sad that we need to keep ugly obsolete
+ * code to make them happy.
+ *
+ * They should be moved to more reasonable state, now
+ * they use rebuild_header INSTEAD OF hard_start_xmit!!!
+ * Besides that, they are sort of out of date
+ * (a lot of redundant clones/copies, useless in 2.1),
+ * I wonder why people believe that they work.
*/
switch (dev->type) {
default:
@@ -296,16 +297,19 @@ static int arp_constructor(struct neighbour *neigh)
neigh->ops = &arp_broken_ops;
neigh->output = neigh->ops->output;
return 0;
+#else
+ break;
#endif
- ;}
+ }
#endif
if (neigh->type == RTN_MULTICAST) {
neigh->nud_state = NUD_NOARP;
arp_mc_map(addr, neigh->ha, dev, 1);
- } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
+ } else if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) {
neigh->nud_state = NUD_NOARP;
memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
- } else if (neigh->type == RTN_BROADCAST || dev->flags&IFF_POINTOPOINT) {
+ } else if (neigh->type == RTN_BROADCAST ||
+ dev->flags & IFF_POINTOPOINT) {
neigh->nud_state = NUD_NOARP;
memcpy(neigh->ha, dev->broadcast, dev->addr_len);
}
@@ -334,7 +338,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
__be32 saddr = 0;
u8 *dst_ha = NULL;
struct net_device *dev = neigh->dev;
- __be32 target = *(__be32*)neigh->primary_key;
+ __be32 target = *(__be32 *)neigh->primary_key;
int probes = atomic_read(&neigh->probes);
struct in_device *in_dev;
@@ -346,11 +350,12 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
}
switch (IN_DEV_ARP_ANNOUNCE(in_dev)) {
default:
- case 0: /* By default announce any local IP */
- if (skb && inet_addr_type(dev_net(dev), ip_hdr(skb)->saddr) == RTN_LOCAL)
+ case 0: /* By default announce any local IP */
+ if (skb && inet_addr_type(dev_net(dev),
+ ip_hdr(skb)->saddr) == RTN_LOCAL)
saddr = ip_hdr(skb)->saddr;
break;
- case 1: /* Restrict announcements of saddr in same subnet */
+ case 1: /* Restrict announcements of saddr in same subnet */
if (!skb)
break;
saddr = ip_hdr(skb)->saddr;
@@ -361,7 +366,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
}
saddr = 0;
break;
- case 2: /* Avoid secondary IPs, get a primary/preferred one */
+ case 2: /* Avoid secondary IPs, get a primary/preferred one */
break;
}
rcu_read_unlock();
@@ -369,16 +374,20 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
if (!saddr)
saddr = inet_select_addr(dev, target, RT_SCOPE_LINK);
- if ((probes -= neigh->parms->ucast_probes) < 0) {
+ probes -= neigh->parms->ucast_probes;
+ if (probes < 0) {
if (!(neigh->nud_state&NUD_VALID))
- printk(KERN_DEBUG "trying to ucast probe in NUD_INVALID\n");
+ pr_debug("trying to ucast probe in NUD_INVALID\n");
dst_ha = neigh->ha;
read_lock_bh(&neigh->lock);
- } else if ((probes -= neigh->parms->app_probes) < 0) {
+ } else {
+ probes -= neigh->parms->app_probes;
+ if (probes < 0) {
#ifdef CONFIG_ARPD
- neigh_app_ns(neigh);
+ neigh_app_ns(neigh);
#endif
- return;
+ return;
+ }
}
arp_send(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr,
@@ -443,19 +452,20 @@ static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev)
/* OBSOLETE FUNCTIONS */
/*
- * Find an arp mapping in the cache. If not found, post a request.
+ * Find an arp mapping in the cache. If not found, post a request.
*
- * It is very UGLY routine: it DOES NOT use skb->dst->neighbour,
- * even if it exists. It is supposed that skb->dev was mangled
- * by a virtual device (eql, shaper). Nobody but broken devices
- * is allowed to use this function, it is scheduled to be removed. --ANK
+ * It is very UGLY routine: it DOES NOT use skb->dst->neighbour,
+ * even if it exists. It is supposed that skb->dev was mangled
+ * by a virtual device (eql, shaper). Nobody but broken devices
+ * is allowed to use this function, it is scheduled to be removed. --ANK
*/
-static int arp_set_predefined(int addr_hint, unsigned char * haddr, __be32 paddr, struct net_device * dev)
+static int arp_set_predefined(int addr_hint, unsigned char *haddr,
+ __be32 paddr, struct net_device *dev)
{
switch (addr_hint) {
case RTN_LOCAL:
- printk(KERN_DEBUG "ARP: arp called for own IP address\n");
+ pr_debug("ARP: arp called for own IP address\n");
memcpy(haddr, dev->dev_addr, dev->addr_len);
return 1;
case RTN_MULTICAST:
@@ -476,14 +486,15 @@ int arp_find(unsigned char *haddr, struct sk_buff *skb)
struct neighbour *n;
if (!skb_dst(skb)) {
- printk(KERN_DEBUG "arp_find is called with dst==NULL\n");
+ pr_debug("arp_find is called with dst==NULL\n");
kfree_skb(skb);
return 1;
}
paddr = skb_rtable(skb)->rt_gateway;
- if (arp_set_predefined(inet_addr_type(dev_net(dev), paddr), haddr, paddr, dev))
+ if (arp_set_predefined(inet_addr_type(dev_net(dev), paddr), haddr,
+ paddr, dev))
return 0;
n = __neigh_lookup(&arp_tbl, &paddr, dev, 1);
@@ -515,13 +526,14 @@ int arp_bind_neighbour(struct dst_entry *dst)
return -EINVAL;
if (n == NULL) {
__be32 nexthop = ((struct rtable *)dst)->rt_gateway;
- if (dev->flags&(IFF_LOOPBACK|IFF_POINTOPOINT))
+ if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
nexthop = 0;
n = __neigh_lookup_errno(
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
- dev->type == ARPHRD_ATM ? clip_tbl_hook :
+ dev->type == ARPHRD_ATM ?
+ clip_tbl_hook :
#endif
- &arp_tbl, &nexthop, dev);
+ &arp_tbl, &nexthop, dev);
if (IS_ERR(n))
return PTR_ERR(n);
dst->neighbour = n;
@@ -529,9 +541,7 @@ int arp_bind_neighbour(struct dst_entry *dst)
return 0;
}
-/*
- * Check if we can use proxy ARP for this path
- */
+/* Check if we can use proxy ARP for this path */
static inline int arp_fwd_proxy(struct in_device *in_dev,
struct net_device *dev, struct rtable *rt)
{
@@ -543,8 +553,8 @@ static inline int arp_fwd_proxy(struct in_device *in_dev,
if (!IN_DEV_PROXY_ARP(in_dev))
return 0;
-
- if ((imi = IN_DEV_MEDIUM_ID(in_dev)) == 0)
+ imi = IN_DEV_MEDIUM_ID(in_dev);
+ if (imi == 0)
return 1;
if (imi == -1)
return 0;
@@ -595,14 +605,9 @@ static inline int arp_fwd_pvlan(struct in_device *in_dev,
return 0;
}
-/*
- * Interface to link layer: send routine and receive handler.
- */
+/* Interface to link layer: send routine and receive handler. */
-/*
- * Create an arp packet. If (dest_hw == NULL), we create a broadcast
- * message.
- */
+/* Create an arp packet. If (dest_hw == NULL), we create a broadcast message. */
struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
struct net_device *dev, __be32 src_ip,
const unsigned char *dest_hw,
@@ -613,9 +618,7 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
struct arphdr *arp;
unsigned char *arp_ptr;
- /*
- * Allocate a buffer
- */
+ /* Allocate a buffer */
skb = alloc_skb(arp_hdr_len(dev) + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
if (skb == NULL)
@@ -631,9 +634,7 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
if (dest_hw == NULL)
dest_hw = dev->broadcast;
- /*
- * Fill the device header for the ARP frame
- */
+ /* Fill the device header for the ARP frame */
if (dev_hard_header(skb, dev, ptype, dest_hw, src_hw, skb->len) < 0)
goto out;
@@ -642,10 +643,9 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
*
* The arp hardware type should match the device type, except for FDDI,
* which (according to RFC 1390) should always equal 1 (Ethernet).
- */
- /*
- * Exceptions everywhere. AX.25 uses the AX.25 PID value not the
- * DIX code for the protocol. Make these device structure fields.
+ *
+ * Exceptions everywhere. AX.25 uses the AX.25 PID value not the
+ * DIX code for the protocol. Make these device structure fields.
*/
switch (dev->type) {
default:
@@ -685,7 +685,7 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
arp->ar_pln = 4;
arp->ar_op = htons(type);
- arp_ptr=(unsigned char *)(arp+1);
+ arp_ptr = (unsigned char *)(arp+1);
memcpy(arp_ptr, src_hw, dev->addr_len);
arp_ptr += dev->addr_len;
@@ -706,9 +706,7 @@ out:
}
EXPORT_SYMBOL(arp_create);
-/*
- * Send an arp packet.
- */
+/* Send an arp packet. */
void arp_xmit(struct sk_buff *skb)
{
/* Send it off, maybe filter it using firewalling first. */
@@ -716,9 +714,7 @@ void arp_xmit(struct sk_buff *skb)
}
EXPORT_SYMBOL(arp_xmit);
-/*
- * Create and send an arp packet.
- */
+/* Create and send an arp packet. */
void arp_send(int type, int ptype, __be32 dest_ip,
struct net_device *dev, __be32 src_ip,
const unsigned char *dest_hw, const unsigned char *src_hw,
@@ -726,26 +722,20 @@ void arp_send(int type, int ptype, __be32 dest_ip,
{
struct sk_buff *skb;
- /*
- * No arp on this interface.
- */
-
- if (dev->flags&IFF_NOARP)
+ /* No arp on this interface. */
+ if (dev->flags & IFF_NOARP)
return;
skb = arp_create(type, ptype, dest_ip, dev, src_ip,
dest_hw, src_hw, target_hw);
- if (skb == NULL) {
+ if (skb == NULL)
return;
- }
arp_xmit(skb);
}
EXPORT_SYMBOL(arp_send);
-/*
- * Process an arp request.
- */
+/* Process an arp request. */
static int arp_process(struct sk_buff *skb)
{
@@ -761,7 +751,8 @@ static int arp_process(struct sk_buff *skb)
struct neighbour *n;
struct net *net = dev_net(dev);
- /* arp_rcv below verifies the ARP header and verifies the device
+ /*
+ * arp_rcv below verifies the ARP header and verifies the device
* is ARP'able.
*/
@@ -807,50 +798,45 @@ static int arp_process(struct sk_buff *skb)
}
/* Understand only these message types */
-
if (arp->ar_op != htons(ARPOP_REPLY) &&
arp->ar_op != htons(ARPOP_REQUEST))
goto out;
-/*
- * Extract fields
- */
- arp_ptr= (unsigned char *)(arp+1);
- sha = arp_ptr;
+ /* Extract fields */
+ arp_ptr = (unsigned char *)(arp + 1);
+ sha = arp_ptr;
arp_ptr += dev->addr_len;
memcpy(&sip, arp_ptr, 4);
arp_ptr += 4;
arp_ptr += dev->addr_len;
memcpy(&tip, arp_ptr, 4);
-/*
- * Check for bad requests for 127.x.x.x and requests for multicast
- * addresses. If this is one such, delete it.
- */
+ /*
+ * Check for bad requests for 127.x.x.x and requests for multicast
+ * addresses. If this is one such, delete it.
+ */
if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
goto out;
-/*
- * Special case: We must set Frame Relay source Q.922 address
- */
+ /* Special case: We must set Frame Relay source Q.922 address */
if (dev_type == ARPHRD_DLCI)
sha = dev->broadcast;
-/*
- * Process entry. The idea here is we want to send a reply if it is a
- * request for us or if it is a request for someone else that we hold
- * a proxy for. We want to add an entry to our cache if it is a reply
- * to us or if it is a request for our address.
- * (The assumption for this last is that if someone is requesting our
- * address, they are probably intending to talk to us, so it saves time
- * if we cache their address. Their address is also probably not in
- * our cache, since ours is not in their cache.)
- *
- * Putting this another way, we only care about replies if they are to
- * us, in which case we add them to the cache. For requests, we care
- * about those for us and those for our proxies. We reply to both,
- * and in the case of requests for us we add the requester to the arp
- * cache.
- */
+ /*
+ * Process entry. The idea here is we want to send a reply if it is a
+ * request for us or if it is a request for someone else that we hold
+ * a proxy for. We want to add an entry to our cache if it is a reply
+ * to us or if it is a request for our address.
+ * (The assumption for this last is that if someone is requesting our
+ * address, they are probably intending to talk to us, so it saves time
+ * if we cache their address. Their address is also probably not in
+ * our cache, since ours is not in their cache.)
+ *
+ * Putting this another way, we only care about replies if they are to
+ * us, in which case we add them to the cache. For requests, we care
+ * about those for us and those for our proxies. We reply to both,
+ * and in the case of requests for us we add the requester to the arp
+ * cache.
+ */
/* Special case: IPv4 duplicate address detection packet (RFC2131) */
if (sip == 0) {
@@ -869,16 +855,17 @@ static int arp_process(struct sk_buff *skb)
addr_type = rt->rt_type;
if (addr_type == RTN_LOCAL) {
- int dont_send = 0;
+ int dont_send;
- if (!dont_send)
- dont_send |= arp_ignore(in_dev,sip,tip);
+ dont_send = arp_ignore(in_dev, sip, tip);
if (!dont_send && IN_DEV_ARPFILTER(in_dev))
- dont_send |= arp_filter(sip,tip,dev);
+ dont_send |= arp_filter(sip, tip, dev);
if (!dont_send) {
n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
if (n) {
- arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha);
+ arp_send(ARPOP_REPLY, ETH_P_ARP, sip,
+ dev, tip, sha, dev->dev_addr,
+ sha);
neigh_release(n);
}
}
@@ -887,8 +874,7 @@ static int arp_process(struct sk_buff *skb)
if (addr_type == RTN_UNICAST &&
(arp_fwd_proxy(in_dev, dev, rt) ||
arp_fwd_pvlan(in_dev, dev, rt, sip, tip) ||
- pneigh_lookup(&arp_tbl, net, &tip, dev, 0)))
- {
+ pneigh_lookup(&arp_tbl, net, &tip, dev, 0))) {
n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
if (n)
neigh_release(n);
@@ -896,9 +882,12 @@ static int arp_process(struct sk_buff *skb)
if (NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED ||
skb->pkt_type == PACKET_HOST ||
in_dev->arp_parms->proxy_delay == 0) {
- arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha);
+ arp_send(ARPOP_REPLY, ETH_P_ARP, sip,
+ dev, tip, sha, dev->dev_addr,
+ sha);
} else {
- pneigh_enqueue(&arp_tbl, in_dev->arp_parms, skb);
+ pneigh_enqueue(&arp_tbl,
+ in_dev->arp_parms, skb);
return 0;
}
goto out;
@@ -911,9 +900,10 @@ static int arp_process(struct sk_buff *skb)
n = __neigh_lookup(&arp_tbl, &sip, dev, 0);
if (IPV4_DEVCONF_ALL(dev_net(dev), ARP_ACCEPT)) {
- /* Unsolicited ARP is not accepted by default.
- It is possible, that this option should be enabled for some
- devices (strip is candidate)
+ /*
+ * Unsolicited ARP is not accepted by default.
+ * It is possible, that this option should be enabled for some
+ * devices (strip is candidate)
*/
if (n == NULL &&
(arp->ar_op == htons(ARPOP_REPLY) ||
@@ -926,20 +916,23 @@ static int arp_process(struct sk_buff *skb)
int state = NUD_REACHABLE;
int override;
- /* If several different ARP replies follows back-to-back,
- use the FIRST one. It is possible, if several proxy
- agents are active. Taking the first reply prevents
- arp trashing and chooses the fastest router.
+ /*
+ * If several different ARP replies follows back-to-back,
+ * use the FIRST one. It is possible, if several proxy
+ * agents are active. Taking the first reply prevents
+ * arp trashing and chooses the fastest router.
*/
override = time_after(jiffies, n->updated + n->parms->locktime);
- /* Broadcast replies and request packets
- do not assert neighbour reachability.
+ /*
+ * Broadcast replies and request packets
+ * do not assert neighbour reachability.
*/
if (arp->ar_op != htons(ARPOP_REPLY) ||
skb->pkt_type != PACKET_HOST)
state = NUD_STALE;
- neigh_update(n, sha, state, override ? NEIGH_UPDATE_F_OVERRIDE : 0);
+ neigh_update(n, sha, state,
+ override ? NEIGH_UPDATE_F_OVERRIDE : 0);
neigh_release(n);
}
@@ -954,9 +947,7 @@ static void parp_redo(struct sk_buff *skb)
}
-/*
- * Receive an arp request from the device layer.
- */
+/* Receive an arp request from the device layer. */
static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
@@ -975,7 +966,8 @@ static int arp_rcv(struct sk_buff *skb, struct net_device *dev,
arp->ar_pln != 4)
goto freeskb;
- if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (skb == NULL)
goto out_of_mem;
memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
@@ -988,13 +980,9 @@ out_of_mem:
return 0;
}
-/*
- * User level interface (ioctl)
- */
+/* User level interface (ioctl) */
-/*
- * Set (create) an ARP cache entry.
- */
+/* Set (create) an ARP cache entry. */
static int arp_req_set_proxy(struct net *net, struct net_device *dev, int on)
{
@@ -1019,7 +1007,7 @@ static int arp_req_set_public(struct net *net, struct arpreq *r,
return -EINVAL;
if (!dev && (r->arp_flags & ATF_COM)) {
dev = dev_getbyhwaddr(net, r->arp_ha.sa_family,
- r->arp_ha.sa_data);
+ r->arp_ha.sa_data);
if (!dev)
return -ENODEV;
}
@@ -1033,7 +1021,7 @@ static int arp_req_set_public(struct net *net, struct arpreq *r,
}
static int arp_req_set(struct net *net, struct arpreq *r,
- struct net_device * dev)
+ struct net_device *dev)
{
__be32 ip;
struct neighbour *neigh;
@@ -1048,8 +1036,9 @@ static int arp_req_set(struct net *net, struct arpreq *r,
if (dev == NULL) {
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip,
.tos = RTO_ONLINK } } };
- struct rtable * rt;
- if ((err = ip_route_output_key(net, &rt, &fl)) != 0)
+ struct rtable *rt;
+ err = ip_route_output_key(net, &rt, &fl);
+ if (err != 0)
return err;
dev = rt->dst.dev;
ip_rt_put(rt);
@@ -1083,9 +1072,9 @@ static int arp_req_set(struct net *net, struct arpreq *r,
unsigned state = NUD_STALE;
if (r->arp_flags & ATF_PERM)
state = NUD_PERMANENT;
- err = neigh_update(neigh, (r->arp_flags&ATF_COM) ?
+ err = neigh_update(neigh, (r->arp_flags & ATF_COM) ?
r->arp_ha.sa_data : NULL, state,
- NEIGH_UPDATE_F_OVERRIDE|
+ NEIGH_UPDATE_F_OVERRIDE |
NEIGH_UPDATE_F_ADMIN);
neigh_release(neigh);
}
@@ -1094,17 +1083,15 @@ static int arp_req_set(struct net *net, struct arpreq *r,
static unsigned arp_state_to_flags(struct neighbour *neigh)
{
- unsigned flags = 0;
- if (neigh->nud_state&NUD_PERMANENT)
- flags = ATF_PERM|ATF_COM;
- else if (neigh->nud_state&NUD_VALID)
- flags = ATF_COM;
- return flags;
+ if (neigh->nud_state & NUD_PERMANENT)
+ return ATF_PERM | ATF_COM;
+ else if (neigh->nud_state & NUD_VALID)
+ return ATF_COM;
+ else
+ return 0;
}
-/*
- * Get an ARP cache entry.
- */
+/* Get an ARP cache entry. */
static int arp_req_get(struct arpreq *r, struct net_device *dev)
{
@@ -1142,7 +1129,7 @@ static int arp_req_delete_public(struct net *net, struct arpreq *r,
}
static int arp_req_delete(struct net *net, struct arpreq *r,
- struct net_device * dev)
+ struct net_device *dev)
{
int err;
__be32 ip;
@@ -1155,8 +1142,9 @@ static int arp_req_delete(struct net *net, struct arpreq *r,
if (dev == NULL) {
struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip,
.tos = RTO_ONLINK } } };
- struct rtable * rt;
- if ((err = ip_route_output_key(net, &rt, &fl)) != 0)
+ struct rtable *rt;
+ err = ip_route_output_key(net, &rt, &fl);
+ if (err != 0)
return err;
dev = rt->dst.dev;
ip_rt_put(rt);
@@ -1166,7 +1154,7 @@ static int arp_req_delete(struct net *net, struct arpreq *r,
err = -ENXIO;
neigh = neigh_lookup(&arp_tbl, &ip, dev);
if (neigh) {
- if (neigh->nud_state&~NUD_NOARP)
+ if (neigh->nud_state & ~NUD_NOARP)
err = neigh_update(neigh, NULL, NUD_FAILED,
NEIGH_UPDATE_F_OVERRIDE|
NEIGH_UPDATE_F_ADMIN);
@@ -1175,9 +1163,7 @@ static int arp_req_delete(struct net *net, struct arpreq *r,
return err;
}
-/*
- * Handle an ARP layer I/O control request.
- */
+/* Handle an ARP layer I/O control request. */
int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg)
{
@@ -1186,24 +1172,24 @@ int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg)
struct net_device *dev = NULL;
switch (cmd) {
- case SIOCDARP:
- case SIOCSARP:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- case SIOCGARP:
- err = copy_from_user(&r, arg, sizeof(struct arpreq));
- if (err)
- return -EFAULT;
- break;
- default:
- return -EINVAL;
+ case SIOCDARP:
+ case SIOCSARP:
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+ case SIOCGARP:
+ err = copy_from_user(&r, arg, sizeof(struct arpreq));
+ if (err)
+ return -EFAULT;
+ break;
+ default:
+ return -EINVAL;
}
if (r.arp_pa.sa_family != AF_INET)
return -EPFNOSUPPORT;
if (!(r.arp_flags & ATF_PUBL) &&
- (r.arp_flags & (ATF_NETMASK|ATF_DONTPUB)))
+ (r.arp_flags & (ATF_NETMASK | ATF_DONTPUB)))
return -EINVAL;
if (!(r.arp_flags & ATF_NETMASK))
((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr =
@@ -1211,7 +1197,8 @@ int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg)
rtnl_lock();
if (r.arp_dev[0]) {
err = -ENODEV;
- if ((dev = __dev_get_by_name(net, r.arp_dev)) == NULL)
+ dev = __dev_get_by_name(net, r.arp_dev);
+ if (dev == NULL)
goto out;
/* Mmmm... It is wrong... ARPHRD_NETROM==0 */
@@ -1243,7 +1230,8 @@ out:
return err;
}
-static int arp_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
+static int arp_netdev_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
{
struct net_device *dev = ptr;
@@ -1263,9 +1251,10 @@ static struct notifier_block arp_netdev_notifier = {
.notifier_call = arp_netdev_event,
};
-/* Note, that it is not on notifier chain.
- It is necessary, that this routine was called after route cache will be
- flushed.
+/*
+ * Note, that it is not on notifier chain.
+ * It is necessary, that this routine was called after route cache will be
+ * flushed.
*/
void arp_ifdown(struct net_device *dev)
{
@@ -1273,9 +1262,7 @@ void arp_ifdown(struct net_device *dev)
}
-/*
- * Called once on startup.
- */
+/* Called once on startup. */
static struct packet_type arp_packet_type __read_mostly = {
.type = cpu_to_be16(ETH_P_ARP),
@@ -1299,10 +1286,7 @@ void __init arp_init(void)
#ifdef CONFIG_PROC_FS
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-/* ------------------------------------------------------------------------ */
-/*
- * ax25 -> ASCII conversion
- */
+/* ax25 -> ASCII conversion */
static char *ax2asc2(ax25_address *a, char *buf)
{
char c, *s;
@@ -1311,12 +1295,13 @@ static char *ax2asc2(ax25_address *a, char *buf)
for (n = 0, s = buf; n < 6; n++) {
c = (a->ax25_call[n] >> 1) & 0x7F;
- if (c != ' ') *s++ = c;
+ if (c != ' ')
+ *s++ = c;
}
*s++ = '-';
-
- if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) {
+ n = (a->ax25_call[6] >> 1) & 0x0F;
+ if (n > 9) {
*s++ = '1';
n -= 10;
}
@@ -1325,10 +1310,9 @@ static char *ax2asc2(ax25_address *a, char *buf)
*s++ = '\0';
if (*buf == '\0' || *buf == '-')
- return "*";
+ return "*";
return buf;
-
}
#endif /* CONFIG_AX25 */
@@ -1408,10 +1392,10 @@ static void *arp_seq_start(struct seq_file *seq, loff_t *pos)
/* ------------------------------------------------------------------------ */
static const struct seq_operations arp_seq_ops = {
- .start = arp_seq_start,
- .next = neigh_seq_next,
- .stop = neigh_seq_stop,
- .show = arp_seq_show,
+ .start = arp_seq_start,
+ .next = neigh_seq_next,
+ .stop = neigh_seq_stop,
+ .show = arp_seq_show,
};
static int arp_seq_open(struct inode *inode, struct file *file)
--
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