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Diffstat (limited to 'net/ipv6/icmp.c')
-rw-r--r--net/ipv6/icmp.c610
1 files changed, 342 insertions, 268 deletions
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index f204a7275a0..f6c84a6eb23 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -5,8 +5,6 @@
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
*
- * $Id: icmp.c,v 1.38 2002/02/08 03:57:19 davem Exp $
- *
* Based on net/ipv4/icmp.c
*
* RFC 1885
@@ -31,6 +29,8 @@
* Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data
*/
+#define pr_fmt(fmt) "IPv6: " fmt
+
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
@@ -42,6 +42,7 @@
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/netfilter.h>
+#include <linux/slab.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
@@ -56,6 +57,7 @@
#include <net/ipv6.h>
#include <net/ip6_checksum.h>
+#include <net/ping.h>
#include <net/protocol.h>
#include <net/raw.h>
#include <net/rawv6.h>
@@ -64,14 +66,10 @@
#include <net/addrconf.h>
#include <net/icmp.h>
#include <net/xfrm.h>
+#include <net/inet_common.h>
+#include <net/dsfield.h>
#include <asm/uaccess.h>
-#include <asm/system.h>
-
-DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly;
-EXPORT_SYMBOL(icmpv6_statistics);
-DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics) __read_mostly;
-EXPORT_SYMBOL(icmpv6msg_statistics);
/*
* The ICMP socket(s). This is the most convenient way to flow control
@@ -80,43 +78,57 @@ EXPORT_SYMBOL(icmpv6msg_statistics);
*
* On SMP we have one ICMP socket per-cpu.
*/
-static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL;
-#define icmpv6_socket __get_cpu_var(__icmpv6_socket)
+static inline struct sock *icmpv6_sk(struct net *net)
+{
+ return net->ipv6.icmp_sk[smp_processor_id()];
+}
+
+static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ u8 type, u8 code, int offset, __be32 info)
+{
+ /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */
+ struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset);
+ struct net *net = dev_net(skb->dev);
+
+ if (type == ICMPV6_PKT_TOOBIG)
+ ip6_update_pmtu(skb, net, info, 0, 0);
+ else if (type == NDISC_REDIRECT)
+ ip6_redirect(skb, net, skb->dev->ifindex, 0);
+
+ if (!(type & ICMPV6_INFOMSG_MASK))
+ if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST)
+ ping_err(skb, offset, info);
+}
static int icmpv6_rcv(struct sk_buff *skb);
-static struct inet6_protocol icmpv6_protocol = {
+static const struct inet6_protocol icmpv6_protocol = {
.handler = icmpv6_rcv,
+ .err_handler = icmpv6_err,
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};
-static __inline__ int icmpv6_xmit_lock(void)
+static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
{
+ struct sock *sk;
+
local_bh_disable();
- if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) {
+ sk = icmpv6_sk(net);
+ if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
/* This can happen if the output path (f.e. SIT or
* ip6ip6 tunnel) signals dst_link_failure() for an
* outgoing ICMP6 packet.
*/
local_bh_enable();
- return 1;
+ return NULL;
}
- return 0;
+ return sk;
}
-static __inline__ void icmpv6_xmit_unlock(void)
-{
- spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock);
-}
-
-/*
- * Slightly more convenient version of icmpv6_send.
- */
-void icmpv6_param_prob(struct sk_buff *skb, int code, int pos)
+static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
{
- icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev);
- kfree_skb(skb);
+ spin_unlock_bh(&sk->sk_lock.slock);
}
/*
@@ -130,18 +142,19 @@ void icmpv6_param_prob(struct sk_buff *skb, int code, int pos)
* --ANK (980726)
*/
-static int is_ineligible(struct sk_buff *skb)
+static bool is_ineligible(const struct sk_buff *skb)
{
int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data;
int len = skb->len - ptr;
__u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+ __be16 frag_off;
if (len < 0)
- return 1;
+ return true;
- ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr);
+ ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off);
if (ptr < 0)
- return 0;
+ return false;
if (nexthdr == IPPROTO_ICMPV6) {
u8 _type, *tp;
tp = skb_header_pointer(skb,
@@ -149,48 +162,53 @@ static int is_ineligible(struct sk_buff *skb)
sizeof(_type), &_type);
if (tp == NULL ||
!(*tp & ICMPV6_INFOMSG_MASK))
- return 1;
+ return true;
}
- return 0;
+ return false;
}
/*
* Check the ICMP output rate limit
*/
-static inline int icmpv6_xrlim_allow(struct sock *sk, int type,
- struct flowi *fl)
+static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
+ struct flowi6 *fl6)
{
struct dst_entry *dst;
- int res = 0;
+ struct net *net = sock_net(sk);
+ bool res = false;
/* Informational messages are not limited. */
if (type & ICMPV6_INFOMSG_MASK)
- return 1;
+ return true;
/* Do not limit pmtu discovery, it would break it. */
if (type == ICMPV6_PKT_TOOBIG)
- return 1;
+ return true;
/*
* Look up the output route.
* XXX: perhaps the expire for routing entries cloned by
* this lookup should be more aggressive (not longer than timeout).
*/
- dst = ip6_route_output(sk, fl);
+ dst = ip6_route_output(net, sk, fl6);
if (dst->error) {
- IP6_INC_STATS(ip6_dst_idev(dst),
+ IP6_INC_STATS(net, ip6_dst_idev(dst),
IPSTATS_MIB_OUTNOROUTES);
} else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
- res = 1;
+ res = true;
} else {
struct rt6_info *rt = (struct rt6_info *)dst;
- int tmo = init_net.ipv6.sysctl.icmpv6_time;
+ int tmo = net->ipv6.sysctl.icmpv6_time;
+ struct inet_peer *peer;
/* Give more bandwidth to wider prefixes. */
if (rt->rt6i_dst.plen < 128)
tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
- res = xrlim_allow(dst, tmo);
+ peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
+ res = inet_peer_xrlim_allow(peer, tmo);
+ if (peer)
+ inet_putpeer(peer);
}
dst_release(dst);
return res;
@@ -203,18 +221,19 @@ static inline int icmpv6_xrlim_allow(struct sock *sk, int type,
* highest-order two bits set to 10
*/
-static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset)
+static bool opt_unrec(struct sk_buff *skb, __u32 offset)
{
u8 _optval, *op;
offset += skb_network_offset(skb);
op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
if (op == NULL)
- return 1;
+ return true;
return (*op & 0xC0) == 0x80;
}
-static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len)
+int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
+ struct icmp6hdr *thdr, int len)
{
struct sk_buff *skb;
struct icmp6hdr *icmp6h;
@@ -228,11 +247,11 @@ static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct
icmp6h->icmp6_cksum = 0;
if (skb_queue_len(&sk->sk_write_queue) == 1) {
- skb->csum = csum_partial((char *)icmp6h,
+ skb->csum = csum_partial(icmp6h,
sizeof(struct icmp6hdr), skb->csum);
- icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src,
- &fl->fl6_dst,
- len, fl->proto,
+ icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
+ &fl6->daddr,
+ len, fl6->flowi6_proto,
skb->csum);
} else {
__wsum tmp_csum = 0;
@@ -241,11 +260,11 @@ static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct
tmp_csum = csum_add(tmp_csum, skb->csum);
}
- tmp_csum = csum_partial((char *)icmp6h,
+ tmp_csum = csum_partial(icmp6h,
sizeof(struct icmp6hdr), tmp_csum);
- icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src,
- &fl->fl6_dst,
- len, fl->proto,
+ icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr,
+ &fl6->daddr,
+ len, fl6->flowi6_proto,
tmp_csum);
}
ip6_push_pending_frames(sk);
@@ -273,7 +292,7 @@ static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, st
return 0;
}
-#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
static void mip6_addr_swap(struct sk_buff *skb)
{
struct ipv6hdr *iph = ipv6_hdr(skb);
@@ -287,9 +306,9 @@ static void mip6_addr_swap(struct sk_buff *skb)
if (likely(off >= 0)) {
hao = (struct ipv6_destopt_hao *)
(skb_network_header(skb) + off);
- ipv6_addr_copy(&tmp, &iph->saddr);
- ipv6_addr_copy(&iph->saddr, &hao->addr);
- ipv6_addr_copy(&hao->addr, &tmp);
+ tmp = iph->saddr;
+ iph->saddr = hao->addr;
+ hao->addr = tmp;
}
}
}
@@ -297,42 +316,106 @@ static void mip6_addr_swap(struct sk_buff *skb)
static inline void mip6_addr_swap(struct sk_buff *skb) {}
#endif
+static struct dst_entry *icmpv6_route_lookup(struct net *net,
+ struct sk_buff *skb,
+ struct sock *sk,
+ struct flowi6 *fl6)
+{
+ struct dst_entry *dst, *dst2;
+ struct flowi6 fl2;
+ int err;
+
+ err = ip6_dst_lookup(sk, &dst, fl6);
+ if (err)
+ return ERR_PTR(err);
+
+ /*
+ * We won't send icmp if the destination is known
+ * anycast.
+ */
+ if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
+ LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: acast source\n");
+ dst_release(dst);
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* No need to clone since we're just using its address. */
+ dst2 = dst;
+
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0);
+ if (!IS_ERR(dst)) {
+ if (dst != dst2)
+ return dst;
+ } else {
+ if (PTR_ERR(dst) == -EPERM)
+ dst = NULL;
+ else
+ return dst;
+ }
+
+ err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6);
+ if (err)
+ goto relookup_failed;
+
+ err = ip6_dst_lookup(sk, &dst2, &fl2);
+ if (err)
+ goto relookup_failed;
+
+ dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP);
+ if (!IS_ERR(dst2)) {
+ dst_release(dst);
+ dst = dst2;
+ } else {
+ err = PTR_ERR(dst2);
+ if (err == -EPERM) {
+ dst_release(dst);
+ return dst2;
+ } else
+ goto relookup_failed;
+ }
+
+relookup_failed:
+ if (dst)
+ return dst;
+ return ERR_PTR(err);
+}
+
/*
* Send an ICMP message in response to a packet in error
*/
-void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
- struct net_device *dev)
+static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
{
+ struct net *net = dev_net(skb->dev);
struct inet6_dev *idev = NULL;
struct ipv6hdr *hdr = ipv6_hdr(skb);
struct sock *sk;
struct ipv6_pinfo *np;
- struct in6_addr *saddr = NULL;
+ const struct in6_addr *saddr = NULL;
struct dst_entry *dst;
- struct dst_entry *dst2;
struct icmp6hdr tmp_hdr;
- struct flowi fl;
- struct flowi fl2;
+ struct flowi6 fl6;
struct icmpv6_msg msg;
int iif = 0;
int addr_type = 0;
int len;
- int hlimit, tclass;
+ int hlimit;
int err = 0;
+ u32 mark = IP6_REPLY_MARK(net, skb->mark);
if ((u8 *)hdr < skb->head ||
- (skb->network_header + sizeof(*hdr)) > skb->tail)
+ (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb))
return;
/*
* Make sure we respect the rules
* i.e. RFC 1885 2.4(e)
- * Rule (e.1) is enforced by not using icmpv6_send
+ * Rule (e.1) is enforced by not using icmp6_send
* in any code that processes icmp errors.
*/
addr_type = ipv6_addr_type(&hdr->daddr);
- if (ipv6_chk_addr(&init_net, &hdr->daddr, skb->dev, 0))
+ if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0) ||
+ ipv6_chk_acast_addr_src(net, skb->dev, &hdr->daddr))
saddr = &hdr->daddr;
/*
@@ -355,7 +438,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
* Source addr check
*/
- if (addr_type & IPV6_ADDR_LINKLOCAL)
+ if (__ipv6_addr_needs_scope_id(addr_type))
iif = skb->dev->ifindex;
/*
@@ -365,7 +448,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
* and anycast addresses will be checked later.
*/
if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
- LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n");
+ LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: addr_any/mcast source\n");
return;
}
@@ -373,29 +456,30 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
* Never answer to a ICMP packet.
*/
if (is_ineligible(skb)) {
- LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n");
+ LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: no reply to icmp error\n");
return;
}
mip6_addr_swap(skb);
- memset(&fl, 0, sizeof(fl));
- fl.proto = IPPROTO_ICMPV6;
- ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr);
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_ICMPV6;
+ fl6.daddr = hdr->saddr;
if (saddr)
- ipv6_addr_copy(&fl.fl6_src, saddr);
- fl.oif = iif;
- fl.fl_icmp_type = type;
- fl.fl_icmp_code = code;
- security_skb_classify_flow(skb, &fl);
-
- if (icmpv6_xmit_lock())
+ fl6.saddr = *saddr;
+ fl6.flowi6_mark = mark;
+ fl6.flowi6_oif = iif;
+ fl6.fl6_icmp_type = type;
+ fl6.fl6_icmp_code = code;
+ security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
+
+ sk = icmpv6_xmit_lock(net);
+ if (sk == NULL)
return;
-
- sk = icmpv6_socket->sk;
+ sk->sk_mark = mark;
np = inet6_sk(sk);
- if (!icmpv6_xrlim_allow(sk, type, &fl))
+ if (!icmpv6_xrlim_allow(sk, type, &fl6))
goto out;
tmp_hdr.icmp6_type = type;
@@ -403,70 +487,16 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
tmp_hdr.icmp6_cksum = 0;
tmp_hdr.icmp6_pointer = htonl(info);
- if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
- fl.oif = np->mcast_oif;
+ if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
+ fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
- err = ip6_dst_lookup(sk, &dst, &fl);
- if (err)
+ dst = icmpv6_route_lookup(net, skb, sk, &fl6);
+ if (IS_ERR(dst))
goto out;
- /*
- * We won't send icmp if the destination is known
- * anycast.
- */
- if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
- LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n");
- goto out_dst_release;
- }
-
- /* No need to clone since we're just using its address. */
- dst2 = dst;
-
- err = xfrm_lookup(&dst, &fl, sk, 0);
- switch (err) {
- case 0:
- if (dst != dst2)
- goto route_done;
- break;
- case -EPERM:
- dst = NULL;
- break;
- default:
- goto out;
- }
-
- if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6))
- goto out_dst_release;
-
- if (ip6_dst_lookup(sk, &dst2, &fl))
- goto out_dst_release;
-
- err = xfrm_lookup(&dst2, &fl, sk, XFRM_LOOKUP_ICMP);
- if (err == -ENOENT) {
- if (!dst)
- goto out;
- goto route_done;
- }
-
- dst_release(dst);
- dst = dst2;
-
- if (err)
- goto out;
-
-route_done:
- if (ipv6_addr_is_multicast(&fl.fl6_dst))
- hlimit = np->mcast_hops;
- else
- hlimit = np->hop_limit;
- if (hlimit < 0)
- hlimit = dst_metric(dst, RTAX_HOPLIMIT);
- if (hlimit < 0)
- hlimit = ipv6_get_hoplimit(dst->dev);
-
- tclass = np->tclass;
- if (tclass < 0)
- tclass = 0;
+ hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
msg.skb = skb;
msg.offset = skb_network_offset(skb);
@@ -479,119 +509,122 @@ route_done:
goto out_dst_release;
}
- idev = in6_dev_get(skb->dev);
+ rcu_read_lock();
+ idev = __in6_dev_get(skb->dev);
err = ip6_append_data(sk, icmpv6_getfrag, &msg,
len + sizeof(struct icmp6hdr),
- sizeof(struct icmp6hdr),
- hlimit, tclass, NULL, &fl, (struct rt6_info*)dst,
- MSG_DONTWAIT);
+ sizeof(struct icmp6hdr), hlimit,
+ np->tclass, NULL, &fl6, (struct rt6_info *)dst,
+ MSG_DONTWAIT, np->dontfrag);
if (err) {
+ ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTERRORS);
ip6_flush_pending_frames(sk);
- goto out_put;
+ } else {
+ err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
+ len + sizeof(struct icmp6hdr));
}
- err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr));
-
-out_put:
- if (likely(idev != NULL))
- in6_dev_put(idev);
+ rcu_read_unlock();
out_dst_release:
dst_release(dst);
out:
- icmpv6_xmit_unlock();
+ icmpv6_xmit_unlock(sk);
}
-EXPORT_SYMBOL(icmpv6_send);
+/* Slightly more convenient version of icmp6_send.
+ */
+void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
+{
+ icmp6_send(skb, ICMPV6_PARAMPROB, code, pos);
+ kfree_skb(skb);
+}
static void icmpv6_echo_reply(struct sk_buff *skb)
{
+ struct net *net = dev_net(skb->dev);
struct sock *sk;
struct inet6_dev *idev;
struct ipv6_pinfo *np;
- struct in6_addr *saddr = NULL;
+ const struct in6_addr *saddr = NULL;
struct icmp6hdr *icmph = icmp6_hdr(skb);
struct icmp6hdr tmp_hdr;
- struct flowi fl;
+ struct flowi6 fl6;
struct icmpv6_msg msg;
struct dst_entry *dst;
int err = 0;
int hlimit;
- int tclass;
+ u8 tclass;
+ u32 mark = IP6_REPLY_MARK(net, skb->mark);
saddr = &ipv6_hdr(skb)->daddr;
- if (!ipv6_unicast_destination(skb))
+ if (!ipv6_unicast_destination(skb) &&
+ !(net->ipv6.sysctl.anycast_src_echo_reply &&
+ ipv6_anycast_destination(skb)))
saddr = NULL;
memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
- memset(&fl, 0, sizeof(fl));
- fl.proto = IPPROTO_ICMPV6;
- ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = IPPROTO_ICMPV6;
+ fl6.daddr = ipv6_hdr(skb)->saddr;
if (saddr)
- ipv6_addr_copy(&fl.fl6_src, saddr);
- fl.oif = skb->dev->ifindex;
- fl.fl_icmp_type = ICMPV6_ECHO_REPLY;
- security_skb_classify_flow(skb, &fl);
-
- if (icmpv6_xmit_lock())
+ fl6.saddr = *saddr;
+ fl6.flowi6_oif = skb->dev->ifindex;
+ fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY;
+ fl6.flowi6_mark = mark;
+ security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
+
+ sk = icmpv6_xmit_lock(net);
+ if (sk == NULL)
return;
-
- sk = icmpv6_socket->sk;
+ sk->sk_mark = mark;
np = inet6_sk(sk);
- if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
- fl.oif = np->mcast_oif;
+ if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
+ fl6.flowi6_oif = np->mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np->ucast_oif;
- err = ip6_dst_lookup(sk, &dst, &fl);
+ err = ip6_dst_lookup(sk, &dst, &fl6);
if (err)
goto out;
- if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
+ dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
+ if (IS_ERR(dst))
goto out;
- if (ipv6_addr_is_multicast(&fl.fl6_dst))
- hlimit = np->mcast_hops;
- else
- hlimit = np->hop_limit;
- if (hlimit < 0)
- hlimit = dst_metric(dst, RTAX_HOPLIMIT);
- if (hlimit < 0)
- hlimit = ipv6_get_hoplimit(dst->dev);
-
- tclass = np->tclass;
- if (tclass < 0)
- tclass = 0;
+ hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
- idev = in6_dev_get(skb->dev);
+ idev = __in6_dev_get(skb->dev);
msg.skb = skb;
msg.offset = 0;
msg.type = ICMPV6_ECHO_REPLY;
+ tclass = ipv6_get_dsfield(ipv6_hdr(skb));
err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
- sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl,
- (struct rt6_info*)dst, MSG_DONTWAIT);
+ sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl6,
+ (struct rt6_info *)dst, MSG_DONTWAIT,
+ np->dontfrag);
if (err) {
+ ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
ip6_flush_pending_frames(sk);
- goto out_put;
+ } else {
+ err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr,
+ skb->len + sizeof(struct icmp6hdr));
}
- err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr));
-
-out_put:
- if (likely(idev != NULL))
- in6_dev_put(idev);
dst_release(dst);
out:
- icmpv6_xmit_unlock();
+ icmpv6_xmit_unlock(sk);
}
-static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info)
+void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
{
- struct inet6_protocol *ipprot;
+ const struct inet6_protocol *ipprot;
int inner_offset;
- int hash;
+ __be16 frag_off;
u8 nexthdr;
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
@@ -600,7 +633,8 @@ static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info)
nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
if (ipv6_ext_hdr(nexthdr)) {
/* now skip over extension headers */
- inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr);
+ inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
+ &nexthdr, &frag_off);
if (inner_offset<0)
return;
} else {
@@ -618,10 +652,8 @@ static void icmpv6_notify(struct sk_buff *skb, int type, int code, __be32 info)
--ANK (980726)
*/
- hash = nexthdr & (MAX_INET_PROTOS - 1);
-
rcu_read_lock();
- ipprot = rcu_dereference(inet6_protos[hash]);
+ ipprot = rcu_dereference(inet6_protos[nexthdr]);
if (ipprot && ipprot->err_handler)
ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
rcu_read_unlock();
@@ -637,19 +669,19 @@ static int icmpv6_rcv(struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
struct inet6_dev *idev = __in6_dev_get(dev);
- struct in6_addr *saddr, *daddr;
- struct ipv6hdr *orig_hdr;
+ const struct in6_addr *saddr, *daddr;
struct icmp6hdr *hdr;
- int type;
+ u8 type;
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
+ struct sec_path *sp = skb_sec_path(skb);
int nh;
- if (!(skb->sp && skb->sp->xvec[skb->sp->len - 1]->props.flags &
+ if (!(sp && sp->xvec[sp->len - 1]->props.flags &
XFRM_STATE_ICMP))
goto drop_no_count;
- if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr)))
+ if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr)))
goto drop_no_count;
nh = skb_network_offset(skb);
@@ -661,26 +693,16 @@ static int icmpv6_rcv(struct sk_buff *skb)
skb_set_network_header(skb, nh);
}
- ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS);
+ ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS);
saddr = &ipv6_hdr(skb)->saddr;
daddr = &ipv6_hdr(skb)->daddr;
- /* Perform checksum. */
- switch (skb->ip_summed) {
- case CHECKSUM_COMPLETE:
- if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
- skb->csum))
- break;
- /* fall through */
- case CHECKSUM_NONE:
- skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len,
- IPPROTO_ICMPV6, 0));
- if (__skb_checksum_complete(skb)) {
- LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n",
- NIP6(*saddr), NIP6(*daddr));
- goto discard_it;
- }
+ if (skb_checksum_validate(skb, IPPROTO_ICMPV6, ip6_compute_pseudo)) {
+ LIMIT_NETDEBUG(KERN_DEBUG
+ "ICMPv6 checksum failed [%pI6c > %pI6c]\n",
+ saddr, daddr);
+ goto csum_error;
}
if (!pskb_pull(skb, sizeof(*hdr)))
@@ -690,7 +712,7 @@ static int icmpv6_rcv(struct sk_buff *skb)
type = hdr->icmp6_type;
- ICMP6MSGIN_INC_STATS_BH(idev, type);
+ ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type);
switch (type) {
case ICMPV6_ECHO_REQUEST:
@@ -698,7 +720,7 @@ static int icmpv6_rcv(struct sk_buff *skb)
break;
case ICMPV6_ECHO_REPLY:
- /* we couldn't care less */
+ ping_rcv(skb);
break;
case ICMPV6_PKT_TOOBIG:
@@ -710,9 +732,6 @@ static int icmpv6_rcv(struct sk_buff *skb)
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto discard_it;
hdr = icmp6_hdr(skb);
- orig_hdr = (struct ipv6hdr *) (hdr + 1);
- rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev,
- ntohl(hdr->icmp6_mtu));
/*
* Drop through to notify
@@ -768,40 +787,61 @@ static int icmpv6_rcv(struct sk_buff *skb)
kfree_skb(skb);
return 0;
+csum_error:
+ ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS);
discard_it:
- ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
+ ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS);
drop_no_count:
kfree_skb(skb);
return 0;
}
+void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6,
+ u8 type,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ int oif)
+{
+ memset(fl6, 0, sizeof(*fl6));
+ fl6->saddr = *saddr;
+ fl6->daddr = *daddr;
+ fl6->flowi6_proto = IPPROTO_ICMPV6;
+ fl6->fl6_icmp_type = type;
+ fl6->fl6_icmp_code = 0;
+ fl6->flowi6_oif = oif;
+ security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
+}
+
/*
- * Special lock-class for __icmpv6_socket:
+ * Special lock-class for __icmpv6_sk:
*/
static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
-int __init icmpv6_init(struct net_proto_family *ops)
+static int __net_init icmpv6_sk_init(struct net *net)
{
struct sock *sk;
int err, i, j;
+ net->ipv6.icmp_sk =
+ kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
+ if (net->ipv6.icmp_sk == NULL)
+ return -ENOMEM;
+
for_each_possible_cpu(i) {
- err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6,
- &per_cpu(__icmpv6_socket, i));
+ err = inet_ctl_sock_create(&sk, PF_INET6,
+ SOCK_RAW, IPPROTO_ICMPV6, net);
if (err < 0) {
- printk(KERN_ERR
- "Failed to initialize the ICMP6 control socket "
- "(err %d).\n",
+ pr_err("Failed to initialize the ICMP6 control socket (err %d)\n",
err);
goto fail;
}
- sk = per_cpu(__icmpv6_socket, i)->sk;
- sk->sk_allocation = GFP_ATOMIC;
+ net->ipv6.icmp_sk[i] = sk;
+
/*
* Split off their lock-class, because sk->sk_dst_lock
* gets used from softirqs, which is safe for
- * __icmpv6_socket (because those never get directly used
+ * __icmpv6_sk (because those never get directly used
* via userspace syscalls), but unsafe for normal sockets.
*/
lockdep_set_class(&sk->sk_dst_lock,
@@ -810,41 +850,65 @@ int __init icmpv6_init(struct net_proto_family *ops)
/* Enough space for 2 64K ICMP packets, including
* sk_buff struct overhead.
*/
- sk->sk_sndbuf =
- (2 * ((64 * 1024) + sizeof(struct sk_buff)));
+ sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024);
+ }
+ return 0;
+
+ fail:
+ for (j = 0; j < i; j++)
+ inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]);
+ kfree(net->ipv6.icmp_sk);
+ return err;
+}
- sk->sk_prot->unhash(sk);
+static void __net_exit icmpv6_sk_exit(struct net *net)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]);
}
+ kfree(net->ipv6.icmp_sk);
+}
+
+static struct pernet_operations icmpv6_sk_ops = {
+ .init = icmpv6_sk_init,
+ .exit = icmpv6_sk_exit,
+};
+int __init icmpv6_init(void)
+{
+ int err;
- if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) {
- printk(KERN_ERR "Failed to register ICMP6 protocol\n");
- err = -EAGAIN;
+ err = register_pernet_subsys(&icmpv6_sk_ops);
+ if (err < 0)
+ return err;
+
+ err = -EAGAIN;
+ if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
goto fail;
- }
+ err = inet6_register_icmp_sender(icmp6_send);
+ if (err)
+ goto sender_reg_err;
return 0;
- fail:
- for (j = 0; j < i; j++) {
- if (!cpu_possible(j))
- continue;
- sock_release(per_cpu(__icmpv6_socket, j));
- }
-
+sender_reg_err:
+ inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
+fail:
+ pr_err("Failed to register ICMP6 protocol\n");
+ unregister_pernet_subsys(&icmpv6_sk_ops);
return err;
}
void icmpv6_cleanup(void)
{
- int i;
-
- for_each_possible_cpu(i) {
- sock_release(per_cpu(__icmpv6_socket, i));
- }
+ inet6_unregister_icmp_sender(icmp6_send);
+ unregister_pernet_subsys(&icmpv6_sk_ops);
inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
}
+
static const struct icmp6_err {
int err;
int fatal;
@@ -869,9 +933,17 @@ static const struct icmp6_err {
.err = ECONNREFUSED,
.fatal = 1,
},
+ { /* POLICY_FAIL */
+ .err = EACCES,
+ .fatal = 1,
+ },
+ { /* REJECT_ROUTE */
+ .err = EACCES,
+ .fatal = 1,
+ },
};
-int icmpv6_err_convert(int type, int code, int *err)
+int icmpv6_err_convert(u8 type, u8 code, int *err)
{
int fatal = 0;
@@ -880,7 +952,7 @@ int icmpv6_err_convert(int type, int code, int *err)
switch (type) {
case ICMPV6_DEST_UNREACH:
fatal = 1;
- if (code <= ICMPV6_PORT_UNREACH) {
+ if (code < ARRAY_SIZE(tab_unreach)) {
*err = tab_unreach[code].err;
fatal = tab_unreach[code].fatal;
}
@@ -902,29 +974,31 @@ int icmpv6_err_convert(int type, int code, int *err)
return fatal;
}
-
EXPORT_SYMBOL(icmpv6_err_convert);
#ifdef CONFIG_SYSCTL
-ctl_table ipv6_icmp_table_template[] = {
+static struct ctl_table ipv6_icmp_table_template[] = {
{
- .ctl_name = NET_IPV6_ICMP_RATELIMIT,
.procname = "ratelimit",
.data = &init_net.ipv6.sysctl.icmpv6_time,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = &proc_dointvec
+ .proc_handler = proc_dointvec_ms_jiffies,
},
- { .ctl_name = 0 },
+ { },
};
-struct ctl_table *ipv6_icmp_sysctl_init(struct net *net)
+struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
{
struct ctl_table *table;
table = kmemdup(ipv6_icmp_table_template,
sizeof(ipv6_icmp_table_template),
GFP_KERNEL);
+
+ if (table)
+ table[0].data = &net->ipv6.sysctl.icmpv6_time;
+
return table;
}
#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 05:27:08 +0000