diff options
Diffstat (limited to 'net/ipv4/arp.c')
| -rw-r--r-- | net/ipv4/arp.c | 564 |
1 files changed, 303 insertions, 261 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index c95cd93acf2..1a9b99e0446 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -55,7 +55,7 @@ * 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... @@ -70,8 +70,11 @@ * 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> @@ -88,7 +91,6 @@ #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> @@ -96,7 +98,7 @@ #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 @@ -111,20 +113,15 @@ #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); @@ -136,8 +133,6 @@ static const struct neigh_ops arp_generic_ops = { .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 const struct neigh_ops arp_hh_ops = { @@ -146,56 +141,52 @@ static const struct neigh_ops arp_hh_ops = { .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 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, }; -const 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, + .reachable_time = 30 * HZ, + .data = { + [NEIGH_VAR_MCAST_PROBES] = 3, + [NEIGH_VAR_UCAST_PROBES] = 3, + [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] = 64 * 1024, + [NEIGH_VAR_PROXY_QLEN] = 64, + [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, + [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, + [NEIGH_VAR_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) { @@ -205,12 +196,12 @@ 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); @@ -221,14 +212,16 @@ int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir) } -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; @@ -250,7 +243,7 @@ static int arp_constructor(struct neighbour *neigh) 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) @@ -283,24 +276,27 @@ static int arp_constructor(struct neighbour *neigh) 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); } @@ -310,7 +306,7 @@ static int arp_constructor(struct neighbour *neigh) 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; @@ -327,19 +323,23 @@ static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb) static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) { __be32 saddr = 0; - u8 *dst_ha = NULL; + u8 dst_ha[MAX_ADDR_LEN], *dst_hw = 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(dev_net(dev), 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 */ @@ -356,32 +356,32 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) 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"); - dst_ha = neigh->ha; - read_lock_bh(&neigh->lock); - } else if ((probes -= neigh->parms->app_probes) < 0) { -#ifdef CONFIG_ARPD - neigh_app_ns(neigh); -#endif - return; + probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); + if (probes < 0) { + if (!(neigh->nud_state & NUD_VALID)) + pr_debug("trying to ucast probe in NUD_INVALID\n"); + neigh_ha_snapshot(dst_ha, neigh, dev); + dst_hw = dst_ha; + } else { + probes -= NEIGH_VAR(neigh->parms, APP_PROBES); + if (probes < 0) { + neigh_app_ns(neigh); + return; + } } arp_send(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr, - dst_ha, dev->dev_addr, NULL); - if (dst_ha) - read_unlock_bh(&neigh->lock); + dst_hw, dev->dev_addr, NULL); } static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip) { + struct net *net = dev_net(in_dev->dev); int scope; switch (IN_DEV_ARP_IGNORE(in_dev)) { @@ -400,6 +400,7 @@ static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip) case 3: /* Do not reply for scope host addresses */ sip = 0; scope = RT_SCOPE_LINK; + in_dev = NULL; break; case 4: /* Reserved */ case 5: @@ -411,21 +412,20 @@ static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip) default: return 0; } - return !inet_confirm_addr(in_dev, sip, tip, scope); + return !inet_confirm_addr(net, in_dev, sip, tip, scope); } 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(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) { + if (rt->dst.dev != dev) { NET_INC_STATS_BH(net, LINUX_MIB_ARPFILTER); flag = 1; } @@ -444,11 +444,12 @@ static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev) * 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: @@ -469,24 +470,22 @@ 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)) + paddr = rt_nexthop(skb_rtable(skb), ip_hdr(skb)->daddr); + 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; } @@ -495,56 +494,74 @@ int arp_find(unsigned char *haddr, struct sk_buff *skb) 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; } /* @@ -564,16 +581,18 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, 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_ALLOCATED_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; @@ -605,13 +624,13 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, 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); @@ -619,35 +638,37 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_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_hln = dev->addr_len; 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; - 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; + + switch (dev->type) { +#if IS_ENABLED(CONFIG_FIREWIRE_NET) + case ARPHRD_IEEE1394: + break; +#endif + default: + 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; + } memcpy(arp_ptr, &dest_ip, 4); return skb; @@ -656,6 +677,7 @@ out: kfree_skb(skb); return NULL; } +EXPORT_SYMBOL(arp_create); /* * Send an arp packet. @@ -665,6 +687,7 @@ void arp_xmit(struct sk_buff *skb) /* Send it off, maybe filter it using firewalling first. */ NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, skb, NULL, skb->dev, dev_queue_xmit); } +EXPORT_SYMBOL(arp_xmit); /* * Create and send an arp packet. @@ -685,12 +708,12 @@ void arp_send(int type, int ptype, __be32 dest_ip, 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. @@ -699,7 +722,7 @@ void arp_send(int type, int ptype, __be32 dest_ip, 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; @@ -709,6 +732,7 @@ static int arp_process(struct sk_buff *skb) int addr_type; struct neighbour *n; struct net *net = dev_net(dev); + bool is_garp = false; /* arp_rcv below verifies the ARP header and verifies the device * is ARP'able. @@ -726,11 +750,10 @@ static int arp_process(struct sk_buff *skb) 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 @@ -764,18 +787,26 @@ static int arp_process(struct sk_buff *skb) /* * 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); arp_ptr += 4; - arp_ptr += dev->addr_len; + switch (dev_type) { +#if IS_ENABLED(CONFIG_FIREWIRE_NET) + case ARPHRD_IEEE1394: + break; +#endif + default: + 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. */ - 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; /* @@ -812,40 +843,46 @@ static int arp_process(struct sk_buff *skb) } 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(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); } } 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, 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); + NEIGH_VAR(in_dev->arp_parms, PROXY_DELAY) == 0) { + 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; @@ -857,14 +894,17 @@ 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)) { + 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) */ + is_garp = arp->ar_op == htons(ARPOP_REQUEST) && tip == sip && + inet_addr_type(net, sip) == RTN_UNICAST; + if (n == NULL && - arp->ar_op == htons(ARPOP_REPLY) && - inet_addr_type(net, sip) == RTN_UNICAST) + ((arp->ar_op == htons(ARPOP_REPLY) && + inet_addr_type(net, sip) == RTN_UNICAST) || is_garp)) n = __neigh_lookup(&arp_tbl, &sip, dev, 1); } @@ -877,7 +917,10 @@ static int arp_process(struct sk_buff *skb) agents are active. Taking the first reply prevents arp trashing and chooses the fastest router. */ - override = time_after(jiffies, n->updated + n->parms->locktime); + override = time_after(jiffies, + n->updated + + NEIGH_VAR(n->parms, LOCKTIME)) || + is_garp; /* Broadcast replies and request packets do not assert neighbour reachability. @@ -885,13 +928,12 @@ static int arp_process(struct sk_buff *skb) 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); consume_skb(skb); return 0; } @@ -909,23 +951,25 @@ static void parp_redo(struct sk_buff *skb) static int arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) { - struct arphdr *arp; + const struct arphdr *arp; + + if (dev->flags & IFF_NOARP || + skb->pkt_type == PACKET_OTHERHOST || + skb->pkt_type == PACKET_LOOPBACK) + goto freeskb; + + skb = skb_share_check(skb, GFP_ATOMIC); + if (!skb) + goto out_of_mem; /* ARP header, plus 2 device addresses, plus 2 IP addresses. */ if (!pskb_may_pull(skb, arp_hdr_len(dev))) goto freeskb; arp = arp_hdr(skb); - if (arp->ar_hln != dev->addr_len || - dev->flags & IFF_NOARP || - skb->pkt_type == PACKET_OTHERHOST || - skb->pkt_type == PACKET_LOOPBACK || - arp->ar_pln != 4) + if (arp->ar_hln != dev->addr_len || arp->ar_pln != 4) goto freeskb; - if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) - goto out_of_mem; - memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, skb, dev, NULL, arp_process); @@ -966,8 +1010,8 @@ static int arp_req_set_public(struct net *net, struct arpreq *r, 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; } @@ -981,7 +1025,7 @@ 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; @@ -994,18 +1038,17 @@ static int arp_req_set(struct net *net, struct arpreq *r, 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 @@ -1028,26 +1071,26 @@ static int arp_req_set(struct net *net, struct arpreq *r, 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; } /* @@ -1074,6 +1117,22 @@ static int arp_req_get(struct arpreq *r, struct net_device *dev) return err; } +static 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; +} + static int arp_req_delete_public(struct net *net, struct arpreq *r, struct net_device *dev) { @@ -1090,37 +1149,24 @@ 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; - 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); } /* @@ -1134,24 +1180,24 @@ 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 (!ns_capable(net->user_ns, 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 = @@ -1159,7 +1205,8 @@ 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 */ @@ -1182,23 +1229,30 @@ int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg) 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; + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct netdev_notifier_change_info *change_info; switch (event) { case NETDEV_CHANGEADDR: neigh_changeaddr(&arp_tbl, dev); - rt_cache_flush(dev_net(dev), 0); + rt_cache_flush(dev_net(dev)); + break; + case NETDEV_CHANGE: + change_info = ptr; + if (change_info->flags_changed & IFF_NOARP) + neigh_changeaddr(&arp_tbl, dev); break; default: break; @@ -1239,14 +1293,13 @@ void __init arp_init(void) 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); + neigh_sysctl_register(NULL, &arp_tbl.parms, 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) /* ------------------------------------------------------------------------ */ /* @@ -1260,12 +1313,13 @@ 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; } @@ -1274,10 +1328,9 @@ static char *ax2asc2(ax25_address *a, char *buf) *s++ = '\0'; if (*buf == '\0' || *buf == '-') - return "*"; + return "*"; return buf; - } #endif /* CONFIG_AX25 */ @@ -1294,7 +1347,7 @@ static void arp_format_neigh_entry(struct seq_file *seq, 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 { @@ -1307,7 +1360,7 @@ static void arp_format_neigh_entry(struct seq_file *seq, if (k != 0) --k; hbuffer[k] = 0; -#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) +#if IS_ENABLED(CONFIG_AX25) } #endif sprintf(tbuf, "%pI4", n->primary_key); @@ -1357,10 +1410,10 @@ 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) @@ -1380,14 +1433,14 @@ static const struct file_operations arp_seq_fops = { static int __net_init arp_net_init(struct net *net) { - if (!proc_net_fops_create(net, "arp", S_IRUGO, &arp_seq_fops)) + if (!proc_create("arp", S_IRUGO, net->proc_net, &arp_seq_fops)) return -ENOMEM; return 0; } static void __net_exit arp_net_exit(struct net *net) { - proc_net_remove(net, "arp"); + remove_proc_entry("arp", net->proc_net); } static struct pernet_operations arp_net_ops = { @@ -1408,14 +1461,3 @@ 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 |