From: Jun Yao <yaojun8558363@gmail.com>
To: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, davem@davemloft.net,
edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com,
horms@kernel.org, steffen.klassert@secunet.com,
herbert@gondor.apana.org.au, dsahern@kernel.org,
idosch@nvidia.com, Jun Yao <yaojun8558363@gmail.com>
Subject: [PATCH] xfrm: avoid stale tunnel pointers in deferred input callbacks
Date: Wed, 11 Nov 2026 17:46:29 +0800 [thread overview]
Message-ID: <20261111094629.230568-1-yaojun8558363@gmail.com> (raw)
IP-TFS input can be deferred while its reordering queue waits for a missing
sequence number. The VTI receive callback stores a pointer to the tunnel in
skb->cb, and the device can be removed and freed before the callback runs.
Keep only scalar tunnel metadata in an skb extension. The VTI callbacks
look up the device by ifindex under RCU and check its link configuration
before using its private data. If the VTI no longer exists, drop the
deferred packet. Use the same metadata to preserve tunnel mark handling
and IPv6 tunnel detection, and clear it when a new XFRM receive path starts
and after the callback completes.
Signed-off-by: Jun Yao <yaojun8558363@gmail.com>
---
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6787fcf6a..f97412b95 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -5044,6 +5044,7 @@ enum skb_ext_id {
#endif
#ifdef CONFIG_XFRM
SKB_EXT_SEC_PATH,
+ SKB_EXT_XFRM_TUNNEL,
#endif
#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
TC_SKB_EXT,
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 445223a8d..defdd4088 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -382,6 +382,7 @@ struct xfrm_dst_lookup_params {
};
struct net_device;
+struct ip6_tnl;
struct xfrm_type;
struct xfrm_dst;
struct xfrm_policy_afinfo {
@@ -740,14 +741,52 @@ struct xfrm_tunnel_skb_cb {
struct inet_skb_parm h4;
struct inet6_skb_parm h6;
} header;
+ /* Keep the layout of the other XFRM skb control blocks stable. */
+ unsigned long reserved;
+};
+
+enum xfrm_tunnel_info_type {
+ XFRM_TUNNEL_INFO_VTI4,
+ XFRM_TUNNEL_INFO_VTI6,
+ XFRM_TUNNEL_INFO_IP6,
+};
+/* Stored in an skb extension so it survives asynchronous XFRM input. */
+struct xfrm_tunnel_info {
+ int ifindex;
+ __be32 i_key;
+ u8 type;
union {
- struct ip_tunnel *ip4;
- struct ip6_tnl *ip6;
- } tunnel;
+ struct {
+ int link;
+ __be32 saddr;
+ __be32 daddr;
+ } ip4;
+ struct {
+ int link;
+ u8 proto;
+ struct in6_addr laddr;
+ struct in6_addr raddr;
+ } ip6;
+ };
};
-#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
+static inline struct xfrm_tunnel_info *
+xfrm_tunnel_info_add(struct sk_buff *skb)
+{
+ return skb_ext_add(skb, SKB_EXT_XFRM_TUNNEL);
+}
+
+static inline const struct xfrm_tunnel_info *
+xfrm_tunnel_info(const struct sk_buff *skb)
+{
+ return skb_ext_find(skb, SKB_EXT_XFRM_TUNNEL);
+}
+
+static inline void xfrm_tunnel_info_clear(struct sk_buff *skb)
+{
+ skb_ext_del(skb, SKB_EXT_XFRM_TUNNEL);
+}
/*
* This structure is used for the duration where packets are being
@@ -1851,7 +1890,7 @@ int xfrm4_rcv(struct sk_buff *skb);
static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
{
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
+ xfrm_tunnel_info_clear(skb);
XFRM_SPI_SKB_CB(skb)->family = AF_INET;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
return xfrm_input(skb, nexthdr, spi, 0);
@@ -2300,15 +2339,17 @@ static inline int xfrm_if_id_put(struct sk_buff *skb, __u32 if_id)
static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
unsigned int family)
{
+ const struct xfrm_tunnel_info *info = xfrm_tunnel_info(skb);
bool tunnel = false;
switch(family) {
case AF_INET:
- if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
+ if (info && info->type == XFRM_TUNNEL_INFO_VTI4)
tunnel = true;
break;
case AF_INET6:
- if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
+ if (info && (info->type == XFRM_TUNNEL_INFO_VTI6 ||
+ info->type == XFRM_TUNNEL_INFO_IP6))
tunnel = true;
break;
}
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 8da53d5b7..32f41370d 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5241,6 +5241,7 @@ static const u8 skb_ext_type_len[] = {
#endif
#ifdef CONFIG_XFRM
[SKB_EXT_SEC_PATH] = SKB_EXT_CHUNKSIZEOF(struct sec_path),
+ [SKB_EXT_XFRM_TUNNEL] = SKB_EXT_CHUNKSIZEOF(struct xfrm_tunnel_info),
#endif
#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
[TC_SKB_EXT] = SKB_EXT_CHUNKSIZEOF(struct tc_skb_ext),
diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index abd77162f..fa0a2a73b 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -81,7 +81,7 @@ static struct sk_buff *esp4_gro_receive(struct list_head *head,
if (NAPI_GRO_CB(skb)->proto == IPPROTO_UDP)
encap_type = UDP_ENCAP_ESPINUDP;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
+ xfrm_tunnel_info_clear(skb);
XFRM_SPI_SKB_CB(skb)->family = AF_INET;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
XFRM_SPI_SKB_CB(skb)->seq = seq;
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index c4f14d42d..3594254df 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -58,10 +58,25 @@ static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags,
iph->saddr, iph->daddr, 0);
if (tunnel) {
+ struct xfrm_tunnel_info *info;
+
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
goto drop;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
+ info = xfrm_tunnel_info_add(skb);
+ if (!info)
+ goto drop;
+
+ *info = (struct xfrm_tunnel_info) {
+ .ifindex = tunnel->dev->ifindex,
+ .i_key = tunnel->parms.i_key,
+ .type = XFRM_TUNNEL_INFO_VTI4,
+ .ip4 = {
+ .link = tunnel->parms.link,
+ .saddr = tunnel->parms.iph.saddr,
+ .daddr = tunnel->parms.iph.daddr,
+ },
+ };
if (update_skb_dev)
skb->dev = tunnel->dev;
@@ -96,18 +111,28 @@ static int vti_rcv_proto(struct sk_buff *skb)
static int vti_rcv_cb(struct sk_buff *skb, int err)
{
+ const struct xfrm_tunnel_info *info = xfrm_tunnel_info(skb);
unsigned short family;
struct net_device *dev;
struct xfrm_state *x;
const struct xfrm_mode *inner_mode;
- struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
+ struct ip_tunnel *tunnel;
u32 orig_mark = skb->mark;
int ret;
- if (!tunnel)
+ if (!info || info->type != XFRM_TUNNEL_INFO_VTI4)
return 1;
- dev = tunnel->dev;
+ dev = dev_get_by_index_rcu(dev_net(skb->dev), info->ifindex);
+ if (!dev || dev->rtnl_link_ops != &vti_link_ops)
+ return err ? 1 : -ENODEV;
+
+ tunnel = netdev_priv(dev);
+ if (tunnel->parms.i_key != info->i_key ||
+ tunnel->parms.link != info->ip4.link ||
+ tunnel->parms.iph.saddr != info->ip4.saddr ||
+ tunnel->parms.iph.daddr != info->ip4.daddr)
+ return err ? 1 : -ENODEV;
if (err) {
DEV_STATS_INC(dev, rx_errors);
@@ -131,7 +156,7 @@ static int vti_rcv_cb(struct sk_buff *skb, int err)
family = inner_mode->family;
- skb->mark = be32_to_cpu(tunnel->parms.i_key);
+ skb->mark = be32_to_cpu(info->i_key);
ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
skb->mark = orig_mark;
diff --git a/net/ipv4/xfrm4_protocol.c b/net/ipv4/xfrm4_protocol.c
index 4ee624d8e..c31426ea8 100644
--- a/net/ipv4/xfrm4_protocol.c
+++ b/net/ipv4/xfrm4_protocol.c
@@ -65,7 +65,7 @@ int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
struct xfrm4_protocol *handler;
struct xfrm4_protocol __rcu **head = proto_handlers(nexthdr);
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
+ xfrm_tunnel_info_clear(skb);
XFRM_SPI_SKB_CB(skb)->family = AF_INET;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
@@ -98,7 +98,7 @@ static int xfrm4_esp_rcv(struct sk_buff *skb)
int ret;
struct xfrm4_protocol *handler;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
+ xfrm_tunnel_info_clear(skb);
for_each_protocol_rcu(esp4_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
@@ -126,7 +126,7 @@ static int xfrm4_ah_rcv(struct sk_buff *skb)
int ret;
struct xfrm4_protocol *handler;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
+ xfrm_tunnel_info_clear(skb);
for_each_protocol_rcu(ah4_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
@@ -154,7 +154,7 @@ static int xfrm4_ipcomp_rcv(struct sk_buff *skb)
int ret;
struct xfrm4_protocol *handler;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
+ xfrm_tunnel_info_clear(skb);
for_each_protocol_rcu(ipcomp4_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
index 22895521a..00cdae2c7 100644
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c
@@ -110,7 +110,7 @@ static struct sk_buff *esp6_gro_receive(struct list_head *head,
goto out;
IP6CB(skb)->nhoff = nhoff;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+ xfrm_tunnel_info_clear(skb);
XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
XFRM_SPI_SKB_CB(skb)->seq = seq;
diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index c79027839..6cf40b000 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -302,6 +302,8 @@ static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
rcu_read_lock();
t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
if (t) {
+ struct xfrm_tunnel_info *info;
+
if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
rcu_read_unlock();
goto discard;
@@ -319,9 +321,26 @@ static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
goto discard;
}
+ info = xfrm_tunnel_info_add(skb);
+ if (!info) {
+ rcu_read_unlock();
+ goto discard;
+ }
+
+ *info = (struct xfrm_tunnel_info) {
+ .ifindex = t->dev->ifindex,
+ .i_key = t->parms.i_key,
+ .type = XFRM_TUNNEL_INFO_VTI6,
+ .ip6 = {
+ .link = t->parms.link,
+ .proto = t->parms.proto,
+ .laddr = t->parms.laddr,
+ .raddr = t->parms.raddr,
+ },
+ };
+
rcu_read_unlock();
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
return xfrm_input(skb, nexthdr, spi, encap_type);
@@ -342,18 +361,29 @@ static int vti6_rcv(struct sk_buff *skb)
static int vti6_rcv_cb(struct sk_buff *skb, int err)
{
+ const struct xfrm_tunnel_info *info = xfrm_tunnel_info(skb);
unsigned short family;
struct net_device *dev;
struct xfrm_state *x;
const struct xfrm_mode *inner_mode;
- struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
+ struct ip6_tnl *t;
u32 orig_mark = skb->mark;
int ret;
- if (!t)
+ if (!info || info->type != XFRM_TUNNEL_INFO_VTI6)
return 1;
- dev = t->dev;
+ dev = dev_get_by_index_rcu(dev_net(skb->dev), info->ifindex);
+ if (!dev || dev->rtnl_link_ops != &vti6_link_ops)
+ return err ? 1 : -ENODEV;
+
+ t = netdev_priv(dev);
+ if (t->parms.i_key != info->i_key ||
+ t->parms.link != info->ip6.link ||
+ t->parms.proto != info->ip6.proto ||
+ !ipv6_addr_equal(&t->parms.laddr, &info->ip6.laddr) ||
+ !ipv6_addr_equal(&t->parms.raddr, &info->ip6.raddr))
+ return err ? 1 : -ENODEV;
if (err) {
DEV_STATS_INC(dev, rx_errors);
@@ -377,7 +407,7 @@ static int vti6_rcv_cb(struct sk_buff *skb, int err)
family = inner_mode->family;
- skb->mark = be32_to_cpu(t->parms.i_key);
+ skb->mark = be32_to_cpu(info->i_key);
ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
skb->mark = orig_mark;
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index 07edef258..9aed0b21d 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -15,6 +15,7 @@
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
#include <net/ipv6.h>
+#include <net/ip6_tunnel.h>
#include <net/xfrm.h>
#include <net/protocol.h>
#include <net/gro.h>
@@ -22,7 +23,28 @@
int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,
struct ip6_tnl *t)
{
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
+ struct xfrm_tunnel_info *info;
+
+ xfrm_tunnel_info_clear(skb);
+ if (t) {
+ info = xfrm_tunnel_info_add(skb);
+ if (!info) {
+ kfree_skb(skb);
+ return 0;
+ }
+
+ *info = (struct xfrm_tunnel_info) {
+ .ifindex = t->dev->ifindex,
+ .i_key = t->parms.i_key,
+ .type = XFRM_TUNNEL_INFO_IP6,
+ .ip6 = {
+ .link = t->parms.link,
+ .proto = t->parms.proto,
+ .laddr = t->parms.laddr,
+ .raddr = t->parms.raddr,
+ },
+ };
+ }
XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
return xfrm_input(skb, nexthdr, spi, 0);
diff --git a/net/ipv6/xfrm6_protocol.c b/net/ipv6/xfrm6_protocol.c
index 9b586fcec..2e93029a3 100644
--- a/net/ipv6/xfrm6_protocol.c
+++ b/net/ipv6/xfrm6_protocol.c
@@ -66,7 +66,7 @@ int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
struct xfrm6_protocol *handler;
struct xfrm6_protocol __rcu **head = proto_handlers(nexthdr);
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+ xfrm_tunnel_info_clear(skb);
XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
@@ -113,7 +113,7 @@ static int xfrm6_esp_rcv(struct sk_buff *skb)
int ret;
struct xfrm6_protocol *handler;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+ xfrm_tunnel_info_clear(skb);
for_each_protocol_rcu(esp6_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
@@ -142,7 +142,7 @@ static int xfrm6_ah_rcv(struct sk_buff *skb)
int ret;
struct xfrm6_protocol *handler;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+ xfrm_tunnel_info_clear(skb);
for_each_protocol_rcu(ah6_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
@@ -171,7 +171,7 @@ static int xfrm6_ipcomp_rcv(struct sk_buff *skb)
int ret;
struct xfrm6_protocol *handler;
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+ xfrm_tunnel_info_clear(skb);
for_each_protocol_rcu(ipcomp6_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 5ed87d513..a5d67d506 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -466,6 +466,7 @@ static int xfrm_inner_mode_input(struct xfrm_state *x,
int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
{
const struct xfrm_state_afinfo *afinfo;
+ const struct xfrm_tunnel_info *tunnel_info;
struct net *net = dev_net(skb->dev);
struct net_device *dev = skb->dev;
int err;
@@ -555,16 +556,20 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
}
family = XFRM_SPI_SKB_CB(skb)->family;
+ tunnel_info = xfrm_tunnel_info(skb);
/* if tunnel is present override skb->mark value with tunnel i_key */
switch (family) {
case AF_INET:
- if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
- mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
+ if (tunnel_info &&
+ tunnel_info->type == XFRM_TUNNEL_INFO_VTI4)
+ mark = be32_to_cpu(tunnel_info->i_key);
break;
case AF_INET6:
- if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
- mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
+ if (tunnel_info &&
+ (tunnel_info->type == XFRM_TUNNEL_INFO_VTI6 ||
+ tunnel_info->type == XFRM_TUNNEL_INFO_IP6))
+ mark = be32_to_cpu(tunnel_info->i_key);
break;
}
@@ -739,6 +744,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
goto drop;
}
+ xfrm_tunnel_info_clear(skb);
nf_reset_ct(skb);
if (decaps) {
diff --git a/net/xfrm/xfrm_interface_core.c b/net/xfrm/xfrm_interface_core.c
index 9835fbe63..d91b5f22d 100644
--- a/net/xfrm/xfrm_interface_core.c
+++ b/net/xfrm/xfrm_interface_core.c
@@ -322,10 +322,10 @@ static int xfrmi_input(struct sk_buff *skb, int nexthdr, __be32 spi,
XFRM_SPI_SKB_CB(skb)->family = family;
if (family == AF_INET) {
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
+ xfrm_tunnel_info_clear(skb);
} else {
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
- XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
+ xfrm_tunnel_info_clear(skb);
}
return xfrm_input(skb, nexthdr, spi, encap_type);
next reply other threads:[~2026-11-11 9:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 9:46 Jun Yao [this message]
2026-11-11 9:52 ` netdev-bot+sinfo
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