/* linux/net/ipv4/arp.c
- *
- * Version: $Id: arp.c,v 1.99 2001/08/30 22:55:42 davem Exp $
*
* Copyright (C) 1994 by Florian La Roche
*
* 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...
* bonding can change the skb before
* sending (e.g. insert 8021q tag).
* Harald Welte : convert to make use of jenkins hash
+ * Jesper D. Brouer: Proxy ARP PVLAN RFC 3069 support.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/etherdevice.h>
#include <linux/fddidevice.h>
#include <linux/if_arp.h>
-#include <linux/trdevice.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/rcupdate.h>
-#include <linux/jhash.h>
+#include <linux/slab.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <net/arp.h>
#include <net/ax25.h>
#include <net/netrom.h>
-#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
-#include <net/atmclip.h>
-struct neigh_table *clip_tbl_hook;
-#endif
-#include <asm/system.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <linux/netfilter_arp.h>
/*
* Interface to generic neighbour cache.
*/
-static u32 arp_hash(const void *pkey, const struct net_device *dev);
+static u32 arp_hash(const void *pkey, const struct net_device *dev, __u32 *hash_rnd);
static int arp_constructor(struct neighbour *neigh);
static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb);
static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb);
static void parp_redo(struct sk_buff *skb);
-static struct neigh_ops arp_generic_ops = {
+static const struct neigh_ops arp_generic_ops = {
.family = AF_INET,
.solicit = arp_solicit,
.error_report = arp_error_report,
.output = neigh_resolve_output,
.connected_output = neigh_connected_output,
- .hh_output = dev_queue_xmit,
- .queue_xmit = dev_queue_xmit,
};
-static struct neigh_ops arp_hh_ops = {
+static const struct neigh_ops arp_hh_ops = {
.family = AF_INET,
.solicit = arp_solicit,
.error_report = arp_error_report,
.output = neigh_resolve_output,
.connected_output = neigh_resolve_output,
- .hh_output = dev_queue_xmit,
- .queue_xmit = dev_queue_xmit,
};
-static struct neigh_ops arp_direct_ops = {
+static const struct neigh_ops arp_direct_ops = {
.family = AF_INET,
- .output = dev_queue_xmit,
- .connected_output = dev_queue_xmit,
- .hh_output = dev_queue_xmit,
- .queue_xmit = dev_queue_xmit,
+ .output = neigh_direct_output,
+ .connected_output = neigh_direct_output,
};
-struct neigh_ops arp_broken_ops = {
+static const struct neigh_ops arp_broken_ops = {
.family = AF_INET,
.solicit = arp_solicit,
.error_report = arp_error_report,
.output = neigh_compat_output,
.connected_output = neigh_compat_output,
- .hh_output = dev_queue_xmit,
- .queue_xmit = dev_queue_xmit,
};
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,
+ .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_bytes = 64*1024,
+ .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);
int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir)
{
case ARPHRD_IEEE802:
ip_eth_mc_map(addr, haddr);
return 0;
- case ARPHRD_IEEE802_TR:
- ip_tr_mc_map(addr, haddr);
- return 0;
case ARPHRD_INFINIBAND:
ip_ib_mc_map(addr, dev->broadcast, haddr);
return 0;
+ case ARPHRD_IPGRE:
+ ip_ipgre_mc_map(addr, dev->broadcast, haddr);
+ return 0;
default:
if (dir) {
memcpy(haddr, dev->broadcast, dev->addr_len);
}
-static u32 arp_hash(const void *pkey, const struct net_device *dev)
+static u32 arp_hash(const void *pkey,
+ const struct net_device *dev,
+ __u32 *hash_rnd)
{
- return jhash_2words(*(u32 *)pkey, dev->ifindex, arp_tbl.hash_rnd);
+ return arp_hashfn(*(u32 *)pkey, dev, *hash_rnd);
}
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;
return -EINVAL;
}
- neigh->type = inet_addr_type(&init_net, addr);
+ neigh->type = inet_addr_type(dev_net(dev), addr);
parms = in_dev->arp_parms;
__neigh_parms_put(neigh->parms);
if (!dev->header_ops) {
neigh->nud_state = NUD_NOARP;
neigh->ops = &arp_direct_ops;
- neigh->output = neigh->ops->queue_xmit;
+ neigh->output = neigh_direct_output;
} else {
/* Good devices (checked by reading texts, but only Ethernet is
tested)
default:
break;
case ARPHRD_ROSE:
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+#if IS_ENABLED(CONFIG_AX25)
case ARPHRD_AX25:
-#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
+#if IS_ENABLED(CONFIG_NETROM)
case ARPHRD_NETROM:
#endif
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);
}
else
neigh->ops = &arp_generic_ops;
- if (neigh->nud_state&NUD_VALID)
+ if (neigh->nud_state & NUD_VALID)
neigh->output = neigh->ops->connected_output;
else
neigh->output = neigh->ops->output;
__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 = in_dev_get(dev);
+ struct in_device *in_dev;
- if (!in_dev)
+ rcu_read_lock();
+ in_dev = __in_dev_get_rcu(dev);
+ if (!in_dev) {
+ rcu_read_unlock();
return;
-
+ }
switch (IN_DEV_ARP_ANNOUNCE(in_dev)) {
default:
case 0: /* By default announce any local IP */
- if (skb && inet_addr_type(&init_net, ip_hdr(skb)->saddr) == RTN_LOCAL)
+ 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 */
if (!skb)
break;
saddr = ip_hdr(skb)->saddr;
- if (inet_addr_type(&init_net, saddr) == RTN_LOCAL) {
+ if (inet_addr_type(dev_net(dev), saddr) == RTN_LOCAL) {
/* saddr should be known to target */
if (inet_addr_onlink(in_dev, target, saddr))
break;
case 2: /* Avoid secondary IPs, get a primary/preferred one */
break;
}
+ rcu_read_unlock();
- if (in_dev)
- in_dev_put(in_dev);
if (!saddr)
saddr = inet_select_addr(dev, target, RT_SCOPE_LINK);
- if ((probes -= neigh->parms->ucast_probes) < 0) {
- if (!(neigh->nud_state&NUD_VALID))
- printk(KERN_DEBUG "trying to ucast probe in NUD_INVALID\n");
+ probes -= neigh->parms->ucast_probes;
+ if (probes < 0) {
+ if (!(neigh->nud_state & NUD_VALID))
+ 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,
static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev)
{
- struct flowi fl = { .nl_u = { .ip4_u = { .daddr = sip,
- .saddr = tip } } };
struct rtable *rt;
int flag = 0;
/*unsigned long now; */
+ struct net *net = dev_net(dev);
- if (ip_route_output_key(&init_net, &rt, &fl) < 0)
+ rt = ip_route_output(net, sip, tip, 0, 0);
+ if (IS_ERR(rt))
return 1;
- if (rt->u.dst.dev != dev) {
- NET_INC_STATS_BH(LINUX_MIB_ARPFILTER);
+ if (rt->dst.dev != dev) {
+ NET_INC_STATS_BH(net, LINUX_MIB_ARPFILTER);
flag = 1;
}
ip_rt_put(rt);
* 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 called for own IP address\n");
memcpy(haddr, dev->dev_addr, dev->addr_len);
return 1;
case RTN_MULTICAST:
__be32 paddr;
struct neighbour *n;
- if (!skb->dst) {
- printk(KERN_DEBUG "arp_find is called with dst==NULL\n");
+ if (!skb_dst(skb)) {
+ pr_debug("arp_find is called with dst==NULL\n");
kfree_skb(skb);
return 1;
}
- paddr = skb->rtable->rt_gateway;
+ paddr = skb_rtable(skb)->rt_gateway;
- if (arp_set_predefined(inet_addr_type(&init_net, 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);
if (n) {
n->used = jiffies;
- if (n->nud_state&NUD_VALID || neigh_event_send(n, skb) == 0) {
- read_lock_bh(&n->lock);
- memcpy(haddr, n->ha, dev->addr_len);
- read_unlock_bh(&n->lock);
+ if (n->nud_state & NUD_VALID || neigh_event_send(n, skb) == 0) {
+ neigh_ha_snapshot(haddr, n, dev);
neigh_release(n);
return 0;
}
kfree_skb(skb);
return 1;
}
+EXPORT_SYMBOL(arp_find);
/* END OF OBSOLETE FUNCTIONS */
-int arp_bind_neighbour(struct dst_entry *dst)
-{
- struct net_device *dev = dst->dev;
- struct neighbour *n = dst->neighbour;
-
- if (dev == NULL)
- return -EINVAL;
- if (n == NULL) {
- __be32 nexthop = ((struct rtable*)dst)->rt_gateway;
- 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 :
-#endif
- &arp_tbl, &nexthop, dev);
- if (IS_ERR(n))
- return PTR_ERR(n);
- dst->neighbour = n;
- }
- return 0;
-}
-
/*
* Check if we can use proxy ARP for this path
*/
-
-static inline int arp_fwd_proxy(struct in_device *in_dev, struct rtable *rt)
+static inline int arp_fwd_proxy(struct in_device *in_dev,
+ struct net_device *dev, struct rtable *rt)
{
struct in_device *out_dev;
int imi, omi = -1;
- if (!IN_DEV_PROXY_ARP(in_dev))
+ if (rt->dst.dev == dev)
return 0;
- if ((imi = IN_DEV_MEDIUM_ID(in_dev)) == 0)
+ if (!IN_DEV_PROXY_ARP(in_dev))
+ return 0;
+ imi = IN_DEV_MEDIUM_ID(in_dev);
+ if (imi == 0)
return 1;
if (imi == -1)
return 0;
/* place to check for proxy_arp for routes */
- if ((out_dev = in_dev_get(rt->u.dst.dev)) != NULL) {
+ out_dev = __in_dev_get_rcu(rt->dst.dev);
+ if (out_dev)
omi = IN_DEV_MEDIUM_ID(out_dev);
- in_dev_put(out_dev);
- }
- return (omi != imi && omi != -1);
+
+ return omi != imi && omi != -1;
+}
+
+/*
+ * Check for RFC3069 proxy arp private VLAN (allow to send back to same dev)
+ *
+ * RFC3069 supports proxy arp replies back to the same interface. This
+ * is done to support (ethernet) switch features, like RFC 3069, where
+ * the individual ports are not allowed to communicate with each
+ * other, BUT they are allowed to talk to the upstream router. As
+ * described in RFC 3069, it is possible to allow these hosts to
+ * communicate through the upstream router, by proxy_arp'ing.
+ *
+ * RFC 3069: "VLAN Aggregation for Efficient IP Address Allocation"
+ *
+ * This technology is known by different names:
+ * In RFC 3069 it is called VLAN Aggregation.
+ * Cisco and Allied Telesyn call it Private VLAN.
+ * Hewlett-Packard call it Source-Port filtering or port-isolation.
+ * Ericsson call it MAC-Forced Forwarding (RFC Draft).
+ *
+ */
+static inline int arp_fwd_pvlan(struct in_device *in_dev,
+ struct net_device *dev, struct rtable *rt,
+ __be32 sip, __be32 tip)
+{
+ /* Private VLAN is only concerned about the same ethernet segment */
+ if (rt->dst.dev != dev)
+ return 0;
+
+ /* Don't reply on self probes (often done by windowz boxes)*/
+ if (sip == tip)
+ return 0;
+
+ if (IN_DEV_PROXY_ARP_PVLAN(in_dev))
+ return 1;
+ else
+ return 0;
}
/*
struct sk_buff *skb;
struct arphdr *arp;
unsigned char *arp_ptr;
+ int hlen = LL_RESERVED_SPACE(dev);
+ int tlen = dev->needed_tailroom;
/*
* Allocate a buffer
*/
- skb = alloc_skb(arp_hdr_len(dev) + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
+ skb = alloc_skb(arp_hdr_len(dev) + hlen + tlen, GFP_ATOMIC);
if (skb == NULL)
return NULL;
- skb_reserve(skb, LL_RESERVED_SPACE(dev));
+ skb_reserve(skb, hlen);
skb_reset_network_header(skb);
arp = (struct arphdr *) skb_put(skb, arp_hdr_len(dev));
skb->dev = dev;
arp->ar_pro = htons(ETH_P_IP);
break;
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+#if IS_ENABLED(CONFIG_AX25)
case ARPHRD_AX25:
arp->ar_hrd = htons(ARPHRD_AX25);
arp->ar_pro = htons(AX25_P_IP);
break;
-#if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
+#if IS_ENABLED(CONFIG_NETROM)
case ARPHRD_NETROM:
arp->ar_hrd = htons(ARPHRD_NETROM);
arp->ar_pro = htons(AX25_P_IP);
#endif
#endif
-#ifdef CONFIG_FDDI
+#if IS_ENABLED(CONFIG_FDDI)
case ARPHRD_FDDI:
arp->ar_hrd = htons(ARPHRD_ETHER);
arp->ar_pro = htons(ETH_P_IP);
break;
-#endif
-#ifdef CONFIG_TR
- case ARPHRD_IEEE802_TR:
- arp->ar_hrd = htons(ARPHRD_IEEE802);
- arp->ar_pro = htons(ETH_P_IP);
- break;
#endif
}
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;
- memcpy(arp_ptr, &src_ip,4);
- arp_ptr+=4;
+ arp_ptr += dev->addr_len;
+ memcpy(arp_ptr, &src_ip, 4);
+ arp_ptr += 4;
if (target_hw != NULL)
memcpy(arp_ptr, target_hw, dev->addr_len);
else
memset(arp_ptr, 0, dev->addr_len);
- arp_ptr+=dev->addr_len;
+ arp_ptr += dev->addr_len;
memcpy(arp_ptr, &dest_ip, 4);
return skb;
kfree_skb(skb);
return NULL;
}
+EXPORT_SYMBOL(arp_create);
/*
* Send an arp packet.
void arp_xmit(struct sk_buff *skb)
{
/* Send it off, maybe filter it using firewalling first. */
- NF_HOOK(NF_ARP, NF_ARP_OUT, skb, NULL, skb->dev, dev_queue_xmit);
+ NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, skb, NULL, skb->dev, dev_queue_xmit);
}
+EXPORT_SYMBOL(arp_xmit);
/*
* Create and send an arp packet.
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.
static int arp_process(struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
- struct in_device *in_dev = in_dev_get(dev);
+ struct in_device *in_dev = __in_dev_get_rcu(dev);
struct arphdr *arp;
unsigned char *arp_ptr;
struct rtable *rt;
u16 dev_type = dev->type;
int addr_type;
struct neighbour *n;
+ struct net *net = dev_net(dev);
/* arp_rcv below verifies the ARP header and verifies the device
* is ARP'able.
goto out;
break;
case ARPHRD_ETHER:
- case ARPHRD_IEEE802_TR:
case ARPHRD_FDDI:
case ARPHRD_IEEE802:
/*
- * ETHERNET, Token Ring and Fibre Channel (which are IEEE 802
+ * ETHERNET, and Fibre Channel (which are IEEE 802
* devices, according to RFC 2625) devices will accept ARP
* hardware types of either 1 (Ethernet) or 6 (IEEE 802.2).
* This is the case also of FDDI, where the RFC 1390 says that
/*
* Extract fields
*/
- arp_ptr= (unsigned char *)(arp+1);
+ arp_ptr = (unsigned char *)(arp + 1);
sha = arp_ptr;
arp_ptr += dev->addr_len;
memcpy(&sip, arp_ptr, 4);
* 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))
+ if (ipv4_is_multicast(tip) ||
+ (!IN_DEV_ROUTE_LOCALNET(in_dev) && ipv4_is_loopback(tip)))
goto out;
/*
/* Special case: IPv4 duplicate address detection packet (RFC2131) */
if (sip == 0) {
if (arp->ar_op == htons(ARPOP_REQUEST) &&
- inet_addr_type(&init_net, tip) == RTN_LOCAL &&
+ inet_addr_type(net, tip) == RTN_LOCAL &&
!arp_ignore(in_dev, sip, tip))
arp_send(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
dev->dev_addr, sha);
}
if (arp->ar_op == htons(ARPOP_REQUEST) &&
- ip_route_input(skb, tip, sip, 0, dev) == 0) {
+ ip_route_input_noref(skb, tip, sip, 0, dev) == 0) {
- rt = skb->rtable;
+ rt = skb_rtable(skb);
addr_type = rt->rt_type;
if (addr_type == RTN_LOCAL) {
- n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
- if (n) {
- int dont_send = 0;
-
- if (!dont_send)
- dont_send |= arp_ignore(in_dev,sip,tip);
- if (!dont_send && IN_DEV_ARPFILTER(in_dev))
- dont_send |= arp_filter(sip,tip,dev);
- if (!dont_send)
- arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha);
-
- neigh_release(n);
+ int dont_send;
+
+ dont_send = arp_ignore(in_dev, sip, tip);
+ if (!dont_send && IN_DEV_ARPFILTER(in_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);
+ neigh_release(n);
+ }
}
goto out;
} else if (IN_DEV_FORWARD(in_dev)) {
- if (addr_type == RTN_UNICAST && rt->u.dst.dev != dev &&
- (arp_fwd_proxy(in_dev, rt) || pneigh_lookup(&arp_tbl, &init_net, &tip, dev, 0))) {
+ if (addr_type == RTN_UNICAST &&
+ (arp_fwd_proxy(in_dev, dev, rt) ||
+ arp_fwd_pvlan(in_dev, dev, rt, sip, tip) ||
+ (rt->dst.dev != dev &&
+ pneigh_lookup(&arp_tbl, net, &tip, dev, 0)))) {
n = neigh_event_ns(&arp_tbl, sha, &sip, dev);
if (n)
neigh_release(n);
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);
- in_dev_put(in_dev);
+ pneigh_enqueue(&arp_tbl,
+ in_dev->arp_parms, skb);
return 0;
}
goto out;
n = __neigh_lookup(&arp_tbl, &sip, dev, 0);
- if (IPV4_DEVCONF_ALL(dev->nd_net, ARP_ACCEPT)) {
+ if (IN_DEV_ARP_ACCEPT(in_dev)) {
/* 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) &&
- inet_addr_type(&init_net, sip) == RTN_UNICAST)
+ (arp->ar_op == htons(ARPOP_REPLY) ||
+ (arp->ar_op == htons(ARPOP_REQUEST) && tip == sip)) &&
+ inet_addr_type(net, sip) == RTN_UNICAST)
n = __neigh_lookup(&arp_tbl, &sip, dev, 1);
}
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);
}
out:
- if (in_dev)
- in_dev_put(in_dev);
- kfree_skb(skb);
+ consume_skb(skb);
return 0;
}
{
struct arphdr *arp;
- if (dev->nd_net != &init_net)
- goto freeskb;
-
/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
if (!pskb_may_pull(skb, arp_hdr_len(dev)))
goto freeskb;
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));
- return NF_HOOK(NF_ARP, NF_ARP_IN, skb, dev, NULL, arp_process);
+ return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, skb, dev, NULL, arp_process);
freeskb:
kfree_skb(skb);
if (mask && mask != htonl(0xFFFFFFFF))
return -EINVAL;
if (!dev && (r->arp_flags & ATF_COM)) {
- dev = dev_getbyhwaddr(net, r->arp_ha.sa_family,
- r->arp_ha.sa_data);
+ dev = dev_getbyhwaddr_rcu(net, r->arp_ha.sa_family,
+ r->arp_ha.sa_data);
if (!dev)
return -ENODEV;
}
}
static int arp_req_set(struct net *net, struct arpreq *r,
- struct net_device * dev)
+ struct net_device *dev)
{
__be32 ip;
struct neighbour *neigh;
if (r->arp_flags & ATF_PERM)
r->arp_flags |= ATF_COM;
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)
- return err;
- dev = rt->u.dst.dev;
+ struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0);
+
+ if (IS_ERR(rt))
+ return PTR_ERR(rt);
+ dev = rt->dst.dev;
ip_rt_put(rt);
if (!dev)
return -EINVAL;
}
switch (dev->type) {
-#ifdef CONFIG_FDDI
+#if IS_ENABLED(CONFIG_FDDI)
case ARPHRD_FDDI:
/*
* According to RFC 1390, FDDI devices should accept ARP
neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev);
err = PTR_ERR(neigh);
if (!IS_ERR(neigh)) {
- unsigned state = NUD_STALE;
+ unsigned int 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);
}
return err;
}
-static unsigned arp_state_to_flags(struct neighbour *neigh)
+static unsigned int arp_state_to_flags(struct neighbour *neigh)
{
- unsigned flags = 0;
if (neigh->nud_state&NUD_PERMANENT)
- flags = ATF_PERM|ATF_COM;
+ return ATF_PERM | ATF_COM;
else if (neigh->nud_state&NUD_VALID)
- flags = ATF_COM;
- return flags;
+ return ATF_COM;
+ else
+ return 0;
}
/*
return err;
}
+int arp_invalidate(struct net_device *dev, __be32 ip)
+{
+ struct neighbour *neigh = neigh_lookup(&arp_tbl, &ip, dev);
+ int err = -ENXIO;
+
+ if (neigh) {
+ if (neigh->nud_state & ~NUD_NOARP)
+ err = neigh_update(neigh, NULL, NUD_FAILED,
+ NEIGH_UPDATE_F_OVERRIDE|
+ NEIGH_UPDATE_F_ADMIN);
+ neigh_release(neigh);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(arp_invalidate);
+
static int arp_req_delete_public(struct net *net, struct arpreq *r,
struct net_device *dev)
{
}
static int arp_req_delete(struct net *net, struct arpreq *r,
- struct net_device * dev)
+ struct net_device *dev)
{
- int err;
__be32 ip;
- struct neighbour *neigh;
if (r->arp_flags & ATF_PUBL)
return arp_req_delete_public(net, r, dev);
ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr;
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)
- return err;
- dev = rt->u.dst.dev;
+ struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0);
+ if (IS_ERR(rt))
+ return PTR_ERR(rt);
+ dev = rt->dst.dev;
ip_rt_put(rt);
if (!dev)
return -EINVAL;
}
- err = -ENXIO;
- neigh = neigh_lookup(&arp_tbl, &ip, dev);
- if (neigh) {
- if (neigh->nud_state&~NUD_NOARP)
- err = neigh_update(neigh, NULL, NUD_FAILED,
- NEIGH_UPDATE_F_OVERRIDE|
- NEIGH_UPDATE_F_ADMIN);
- neigh_release(neigh);
- }
- return err;
+ return arp_invalidate(dev, ip);
}
/*
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 =
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 */
break;
case SIOCGARP:
err = arp_req_get(&r, dev);
- if (!err && copy_to_user(arg, &r, sizeof(r)))
- err = -EFAULT;
break;
}
out:
rtnl_unlock();
+ if (cmd == SIOCGARP && !err && copy_to_user(arg, &r, sizeof(r)))
+ err = -EFAULT;
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;
- if (dev->nd_net != &init_net)
- return NOTIFY_DONE;
-
switch (event) {
case NETDEV_CHANGEADDR:
neigh_changeaddr(&arp_tbl, dev);
- rt_cache_flush(0);
+ rt_cache_flush(dev_net(dev), 0);
break;
default:
break;
* Called once on startup.
*/
-static struct packet_type arp_packet_type = {
- .type = __constant_htons(ETH_P_ARP),
+static struct packet_type arp_packet_type __read_mostly = {
+ .type = cpu_to_be16(ETH_P_ARP),
.func = arp_rcv,
};
dev_add_pack(&arp_packet_type);
arp_proc_init();
#ifdef CONFIG_SYSCTL
- neigh_sysctl_register(NULL, &arp_tbl.parms, NET_IPV4,
- NET_IPV4_NEIGH, "ipv4", NULL, NULL);
+ neigh_sysctl_register(NULL, &arp_tbl.parms, "ipv4", NULL);
#endif
register_netdevice_notifier(&arp_netdev_notifier);
}
#ifdef CONFIG_PROC_FS
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+#if IS_ENABLED(CONFIG_AX25)
/* ------------------------------------------------------------------------ */
/*
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;
}
*s++ = '\0';
if (*buf == '\0' || *buf == '-')
- return "*";
+ return "*";
return buf;
-
}
#endif /* CONFIG_AX25 */
struct neighbour *n)
{
char hbuffer[HBUFFERLEN];
- const char hexbuf[] = "0123456789ABCDEF";
int k, j;
char tbuf[16];
struct net_device *dev = n->dev;
read_lock(&n->lock);
/* Convert hardware address to XX:XX:XX:XX ... form. */
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+#if IS_ENABLED(CONFIG_AX25)
if (hatype == ARPHRD_AX25 || hatype == ARPHRD_NETROM)
ax2asc2((ax25_address *)n->ha, hbuffer);
else {
#endif
for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < dev->addr_len; j++) {
- hbuffer[k++] = hexbuf[(n->ha[j] >> 4) & 15];
- hbuffer[k++] = hexbuf[n->ha[j] & 15];
+ hbuffer[k++] = hex_asc_hi(n->ha[j]);
+ hbuffer[k++] = hex_asc_lo(n->ha[j]);
hbuffer[k++] = ':';
}
- hbuffer[--k] = 0;
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+ if (k != 0)
+ --k;
+ hbuffer[k] = 0;
+#if IS_ENABLED(CONFIG_AX25)
}
#endif
- sprintf(tbuf, "%u.%u.%u.%u", NIPQUAD(*(u32*)n->primary_key));
+ sprintf(tbuf, "%pI4", n->primary_key);
seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n",
tbuf, hatype, arp_state_to_flags(n), hbuffer, dev->name);
read_unlock(&n->lock);
int hatype = dev ? dev->type : 0;
char tbuf[16];
- sprintf(tbuf, "%u.%u.%u.%u", NIPQUAD(*(u32*)n->key));
+ sprintf(tbuf, "%pI4", n->key);
seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n",
tbuf, hatype, ATF_PUBL | ATF_PERM, "00:00:00:00:00:00",
dev ? dev->name : "*");
/* ------------------------------------------------------------------------ */
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)
.release = seq_release_net,
};
-static int __init arp_proc_init(void)
+
+static int __net_init arp_net_init(struct net *net)
{
- if (!proc_net_fops_create(&init_net, "arp", S_IRUGO, &arp_seq_fops))
+ if (!proc_net_fops_create(net, "arp", S_IRUGO, &arp_seq_fops))
return -ENOMEM;
return 0;
}
+static void __net_exit arp_net_exit(struct net *net)
+{
+ proc_net_remove(net, "arp");
+}
+
+static struct pernet_operations arp_net_ops = {
+ .init = arp_net_init,
+ .exit = arp_net_exit,
+};
+
+static int __init arp_proc_init(void)
+{
+ return register_pernet_subsys(&arp_net_ops);
+}
+
#else /* CONFIG_PROC_FS */
static int __init arp_proc_init(void)
}
#endif /* CONFIG_PROC_FS */
-
-EXPORT_SYMBOL(arp_broken_ops);
-EXPORT_SYMBOL(arp_find);
-EXPORT_SYMBOL(arp_create);
-EXPORT_SYMBOL(arp_xmit);
-EXPORT_SYMBOL(arp_send);
-EXPORT_SYMBOL(arp_tbl);
-
-#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
-EXPORT_SYMBOL(clip_tbl_hook);
-#endif