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Message-ID: <Z4jq71F78d0gKo7/@gauss3.secunet.de>
Date: Thu, 16 Jan 2025 12:18:07 +0100
From: Steffen Klassert <steffen.klassert@...unet.com>
To: <netdev@...r.kernel.org>
CC: Eric Dumazet <edumazet@...gle.com>, Shahar Shitrit <shshitrit@...dia.com>
Subject: [PATCH ipsec] xfrm: Fix the usage of skb->sk
xfrm assumed to always have a full socket at skb->sk.
This is not always true, so fix it by converting to a
full socket before it is used.
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
net/ipv4/esp4.c | 2 +-
net/ipv6/esp6.c | 2 +-
net/ipv6/xfrm6_output.c | 4 ++--
net/xfrm/xfrm_interface_core.c | 2 +-
net/xfrm/xfrm_output.c | 7 ++++---
net/xfrm/xfrm_policy.c | 2 +-
6 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index f3281312eb5e..8cf5f6634775 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -279,7 +279,7 @@ static void esp_output_done(void *data, int err)
x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
esp_output_tail_tcp(x, skb);
else
- xfrm_output_resume(skb->sk, skb, err);
+ xfrm_output_resume(skb_to_full_sk(skb), skb, err);
}
}
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index b2400c226a32..fad4d7c9fa50 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -315,7 +315,7 @@ static void esp_output_done(void *data, int err)
x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
esp_output_tail_tcp(x, skb);
else
- xfrm_output_resume(skb->sk, skb, err);
+ xfrm_output_resume(skb_to_full_sk(skb), skb, err);
}
}
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 5f7b1fdbffe6..b3d5d1f266ee 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -82,14 +82,14 @@ static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
toobig = skb->len > mtu && !skb_is_gso(skb);
- if (toobig && xfrm6_local_dontfrag(skb->sk)) {
+ if (toobig && xfrm6_local_dontfrag(sk)) {
xfrm6_local_rxpmtu(skb, mtu);
kfree_skb(skb);
return -EMSGSIZE;
} else if (toobig && xfrm6_noneed_fragment(skb)) {
skb->ignore_df = 1;
goto skip_frag;
- } else if (!skb->ignore_df && toobig && skb->sk) {
+ } else if (!skb->ignore_df && toobig && sk) {
xfrm_local_error(skb, mtu);
kfree_skb(skb);
return -EMSGSIZE;
diff --git a/net/xfrm/xfrm_interface_core.c b/net/xfrm/xfrm_interface_core.c
index 98f1e2b67c76..c397eb99d867 100644
--- a/net/xfrm/xfrm_interface_core.c
+++ b/net/xfrm/xfrm_interface_core.c
@@ -506,7 +506,7 @@ xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
skb_dst_set(skb, dst);
skb->dev = tdev;
- err = dst_output(xi->net, skb->sk, skb);
+ err = dst_output(xi->net, skb_to_full_sk(skb), skb);
if (net_xmit_eval(err) == 0) {
dev_sw_netstats_tx_add(dev, 1, length);
} else {
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index e5722c95b8bb..1fb4dc0a76e1 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -796,7 +796,7 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb)
!skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) {
skb->protocol = htons(ETH_P_IP);
- if (skb->sk)
+ if (skb->sk && sk_fullsock(skb->sk))
xfrm_local_error(skb, mtu);
else
icmp_send(skb, ICMP_DEST_UNREACH,
@@ -832,6 +832,7 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb)
{
int mtu, ret = 0;
struct dst_entry *dst = skb_dst(skb);
+ struct sock *sk = skb_to_full_sk(skb);
if (skb->ignore_df)
goto out;
@@ -846,9 +847,9 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb)
skb->dev = dst->dev;
skb->protocol = htons(ETH_P_IPV6);
- if (xfrm6_local_dontfrag(skb->sk))
+ if (xfrm6_local_dontfrag(sk))
ipv6_stub->xfrm6_local_rxpmtu(skb, mtu);
- else if (skb->sk)
+ else if (sk)
xfrm_local_error(skb, mtu);
else
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 4408c11c0835..c27da1fd070e 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2959,7 +2959,7 @@ static void xfrm_policy_queue_process(struct timer_list *t)
skb_dst_drop(skb);
skb_dst_set(skb, dst);
- dst_output(net, skb->sk, skb);
+ dst_output(net, skb_to_full_sk(skb), skb);
}
out:
--
2.34.1
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