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-rw-r--r--include/net/dst.h7
-rw-r--r--include/net/ipv6.h3
-rw-r--r--net/core/sysctl_net_core.c9
-rw-r--r--net/dccp/ipv6.c10
-rw-r--r--net/ipv4/route.c71
-rw-r--r--net/ipv6/datagram.c8
-rw-r--r--net/ipv6/raw.c8
-rw-r--r--net/ipv6/route.c63
-rw-r--r--net/ipv6/tcp_ipv6.c8
-rw-r--r--net/ipv6/udp.c8
-rw-r--r--net/xfrm/xfrm_policy.c28
11 files changed, 209 insertions, 14 deletions
diff --git a/include/net/dst.h b/include/net/dst.h
index e12a8ce0b9b3..82270f9332db 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -265,9 +265,16 @@ static inline int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
{
return 0;
}
+static inline int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
+ struct sock *sk, int flags)
+{
+ return 0;
+}
#else
extern int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
struct sock *sk, int flags);
+extern int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
+ struct sock *sk, int flags);
#endif
#endif
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 4fa5dfe886c4..78a0d06d98d5 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -469,6 +469,9 @@ extern void ip6_flush_pending_frames(struct sock *sk);
extern int ip6_dst_lookup(struct sock *sk,
struct dst_entry **dst,
struct flowi *fl);
+extern int ip6_dst_blackhole(struct sock *sk,
+ struct dst_entry **dst,
+ struct flowi *fl);
extern int ip6_sk_dst_lookup(struct sock *sk,
struct dst_entry **dst,
struct flowi *fl);
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index b29712033dd4..f34aca041a25 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -24,6 +24,7 @@ extern int sysctl_core_destroy_delay;
#ifdef CONFIG_XFRM
extern u32 sysctl_xfrm_aevent_etime;
extern u32 sysctl_xfrm_aevent_rseqth;
+extern int sysctl_xfrm_larval_drop;
#endif
ctl_table core_table[] = {
@@ -118,6 +119,14 @@ ctl_table core_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "xfrm_larval_drop",
+ .data = &sysctl_xfrm_larval_drop,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec
+ },
#endif /* CONFIG_XFRM */
#endif /* CONFIG_NET */
{
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 64eac2515aa2..31737cdf156a 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -1043,9 +1043,13 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
- err = xfrm_lookup(&dst, &fl, sk, 1);
- if (err < 0)
- goto failure;
+ err = __xfrm_lookup(&dst, &fl, sk, 1);
+ if (err < 0) {
+ if (err == -EREMOTE)
+ err = ip6_dst_blackhole(sk, &dst, &fl);
+ if (err < 0)
+ goto failure;
+ }
if (saddr == NULL) {
saddr = &fl.fl6_src;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index df9fe4f2e8cc..8603cfb271f2 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2598,6 +2598,69 @@ int __ip_route_output_key(struct rtable **rp, const struct flowi *flp)
EXPORT_SYMBOL_GPL(__ip_route_output_key);
+static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+}
+
+static struct dst_ops ipv4_dst_blackhole_ops = {
+ .family = AF_INET,
+ .protocol = __constant_htons(ETH_P_IP),
+ .destroy = ipv4_dst_destroy,
+ .check = ipv4_dst_check,
+ .update_pmtu = ipv4_rt_blackhole_update_pmtu,
+ .entry_size = sizeof(struct rtable),
+};
+
+
+static int ipv4_blackhole_output(struct sk_buff *skb)
+{
+ kfree_skb(skb);
+ return 0;
+}
+
+static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp, struct sock *sk)
+{
+ struct rtable *ort = *rp;
+ struct rtable *rt = (struct rtable *)
+ dst_alloc(&ipv4_dst_blackhole_ops);
+
+ if (rt) {
+ struct dst_entry *new = &rt->u.dst;
+
+ atomic_set(&new->__refcnt, 1);
+ new->__use = 1;
+ new->input = ipv4_blackhole_output;
+ new->output = ipv4_blackhole_output;
+ memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
+
+ new->dev = ort->u.dst.dev;
+ if (new->dev)
+ dev_hold(new->dev);
+
+ rt->fl = ort->fl;
+
+ rt->idev = ort->idev;
+ if (rt->idev)
+ in_dev_hold(rt->idev);
+ rt->rt_flags = ort->rt_flags;
+ rt->rt_type = ort->rt_type;
+ rt->rt_dst = ort->rt_dst;
+ rt->rt_src = ort->rt_src;
+ rt->rt_iif = ort->rt_iif;
+ rt->rt_gateway = ort->rt_gateway;
+ rt->rt_spec_dst = ort->rt_spec_dst;
+ rt->peer = ort->peer;
+ if (rt->peer)
+ atomic_inc(&rt->peer->refcnt);
+
+ dst_free(new);
+ }
+
+ dst_release(&(*rp)->u.dst);
+ *rp = rt;
+ return (rt ? 0 : -ENOMEM);
+}
+
int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags)
{
int err;
@@ -2610,7 +2673,11 @@ int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk,
flp->fl4_src = (*rp)->rt_src;
if (!flp->fl4_dst)
flp->fl4_dst = (*rp)->rt_dst;
- return xfrm_lookup((struct dst_entry **)rp, flp, sk, flags);
+ err = __xfrm_lookup((struct dst_entry **)rp, flp, sk, flags);
+ if (err == -EREMOTE)
+ err = ipv4_dst_blackhole(rp, flp, sk);
+
+ return err;
}
return 0;
@@ -3139,6 +3206,8 @@ int __init ip_rt_init(void)
kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+ ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep;
+
rt_hash_table = (struct rt_hash_bucket *)
alloc_large_system_hash("IP route cache",
sizeof(struct rt_hash_bucket),
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 403eee66b9c5..b1fe7ac5dc90 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -177,8 +177,12 @@ ipv4_connected:
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
- if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
- goto out;
+ if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
+ if (err == -EREMOTE)
+ err = ip6_dst_blackhole(sk, &dst, &fl);
+ if (err < 0)
+ goto out;
+ }
/* source address lookup done in ip6_dst_lookup */
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 009a1047fc3f..a58459a76684 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -818,8 +818,12 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
- if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
- goto out;
+ if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
+ if (err == -EREMOTE)
+ err = ip6_dst_blackhole(sk, &dst, &fl);
+ if (err < 0)
+ goto out;
+ }
if (hlimit < 0) {
if (ipv6_addr_is_multicast(&fl.fl6_dst))
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index b46ad53044ba..1324b06796c0 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -119,6 +119,19 @@ static struct dst_ops ip6_dst_ops = {
.entry_size = sizeof(struct rt6_info),
};
+static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+}
+
+static struct dst_ops ip6_dst_blackhole_ops = {
+ .family = AF_INET6,
+ .protocol = __constant_htons(ETH_P_IPV6),
+ .destroy = ip6_dst_destroy,
+ .check = ip6_dst_check,
+ .update_pmtu = ip6_rt_blackhole_update_pmtu,
+ .entry_size = sizeof(struct rt6_info),
+};
+
struct rt6_info ip6_null_entry = {
.u = {
.dst = {
@@ -833,6 +846,54 @@ struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
EXPORT_SYMBOL(ip6_route_output);
+static int ip6_blackhole_output(struct sk_buff *skb)
+{
+ kfree_skb(skb);
+ return 0;
+}
+
+int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
+{
+ struct rt6_info *ort = (struct rt6_info *) *dstp;
+ struct rt6_info *rt = (struct rt6_info *)
+ dst_alloc(&ip6_dst_blackhole_ops);
+ struct dst_entry *new = NULL;
+
+ if (rt) {
+ new = &rt->u.dst;
+
+ atomic_set(&new->__refcnt, 1);
+ new->__use = 1;
+ new->input = ip6_blackhole_output;
+ new->output = ip6_blackhole_output;
+
+ memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
+ new->dev = ort->u.dst.dev;
+ if (new->dev)
+ dev_hold(new->dev);
+ rt->rt6i_idev = ort->rt6i_idev;
+ if (rt->rt6i_idev)
+ in6_dev_hold(rt->rt6i_idev);
+ rt->rt6i_expires = 0;
+
+ ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
+ rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
+ rt->rt6i_metric = 0;
+
+ memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
+#ifdef CONFIG_IPV6_SUBTREES
+ memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
+#endif
+
+ dst_free(new);
+ }
+
+ dst_release(*dstp);
+ *dstp = new;
+ return (new ? 0 : -ENOMEM);
+}
+EXPORT_SYMBOL_GPL(ip6_dst_blackhole);
+
/*
* Destination cache support functions
*/
@@ -2495,6 +2556,8 @@ void __init ip6_route_init(void)
ip6_dst_ops.kmem_cachep =
kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+ ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep;
+
fib6_init();
#ifdef CONFIG_PROC_FS
p = proc_net_create("ipv6_route", 0, rt6_proc_info);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index e2f25ea43b68..4f06a51ad4fd 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -265,8 +265,12 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
- if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
- goto failure;
+ if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
+ if (err == -EREMOTE)
+ err = ip6_dst_blackhole(sk, &dst, &fl);
+ if (err < 0)
+ goto failure;
+ }
if (saddr == NULL) {
saddr = &fl.fl6_src;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index a7ae59c954d5..d1fbddd172e7 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -767,8 +767,12 @@ do_udp_sendmsg:
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
- if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
- goto out;
+ if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
+ if (err == -EREMOTE)
+ err = ip6_dst_blackhole(sk, &dst, &fl);
+ if (err < 0)
+ goto out;
+ }
if (hlimit < 0) {
if (ipv6_addr_is_multicast(&fl.fl6_dst))
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index d0882e53b6fc..b8bab89616a0 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -29,6 +29,8 @@
#include "xfrm_hash.h"
+int sysctl_xfrm_larval_drop;
+
DEFINE_MUTEX(xfrm_cfg_mutex);
EXPORT_SYMBOL(xfrm_cfg_mutex);
@@ -1390,8 +1392,8 @@ static int stale_bundle(struct dst_entry *dst);
* At the moment we eat a raw IP route. Mostly to speed up lookups
* on interfaces with disabled IPsec.
*/
-int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
- struct sock *sk, int flags)
+int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
+ struct sock *sk, int flags)
{
struct xfrm_policy *policy;
struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
@@ -1509,6 +1511,13 @@ restart:
if (unlikely(nx<0)) {
err = nx;
+ if (err == -EAGAIN && sysctl_xfrm_larval_drop) {
+ /* EREMOTE tells the caller to generate
+ * a one-shot blackhole route.
+ */
+ xfrm_pol_put(policy);
+ return -EREMOTE;
+ }
if (err == -EAGAIN && flags) {
DECLARE_WAITQUEUE(wait, current);
@@ -1598,6 +1607,21 @@ error:
*dst_p = NULL;
return err;
}
+EXPORT_SYMBOL(__xfrm_lookup);
+
+int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
+ struct sock *sk, int flags)
+{
+ int err = __xfrm_lookup(dst_p, fl, sk, flags);
+
+ if (err == -EREMOTE) {
+ dst_release(*dst_p);
+ *dst_p = NULL;
+ err = -EAGAIN;
+ }
+
+ return err;
+}
EXPORT_SYMBOL(xfrm_lookup);
static inline int
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 20:36:06 +0000