* [PATCH ipsec] xfrm: do pskb_pull properly in __xfrm_transport_prep
@ 2020-04-10 9:06 Xin Long
2020-04-20 10:36 ` Steffen Klassert
0 siblings, 1 reply; 2+ messages in thread
From: Xin Long @ 2020-04-10 9:06 UTC (permalink / raw)
To: netdev; +Cc: Steffen Klassert, Herbert Xu, David S. Miller, Sabrina Dubroca
For transport mode, when ipv6 nexthdr is set, the packet format might
be like:
----------------------------------------------------
| | dest | | | | ESP | ESP |
| IP6 hdr| opts.| ESP | TCP | Data | Trailer | ICV |
----------------------------------------------------
and in __xfrm_transport_prep():
pskb_pull(skb, skb->mac_len + sizeof(ip6hdr) + x->props.header_len);
it will pull the data pointer to the wrong position, as it missed the
nexthdrs/dest opts.
This patch is to fix it by using:
pskb_pull(skb, skb_transport_offset(skb) + x->props.header_len);
as we can be sure transport_header points to ESP header at that moment.
It also fixes a panic when packets with ipv6 nexthdr are sent over
esp6 transport mode:
[ 100.473845] kernel BUG at net/core/skbuff.c:4325!
[ 100.478517] RIP: 0010:__skb_to_sgvec+0x252/0x260
[ 100.494355] Call Trace:
[ 100.494829] skb_to_sgvec+0x11/0x40
[ 100.495492] esp6_output_tail+0x12e/0x550 [esp6]
[ 100.496358] esp6_xmit+0x1d5/0x260 [esp6_offload]
[ 100.498029] validate_xmit_xfrm+0x22f/0x2e0
[ 100.499604] __dev_queue_xmit+0x589/0x910
[ 100.502928] ip6_finish_output2+0x2a5/0x5a0
[ 100.503718] ip6_output+0x6c/0x120
[ 100.505198] xfrm_output_resume+0x4bf/0x530
[ 100.508683] xfrm6_output+0x3a/0xc0
[ 100.513446] inet6_csk_xmit+0xa1/0xf0
[ 100.517335] tcp_sendmsg+0x27/0x40
[ 100.517977] sock_sendmsg+0x3e/0x60
[ 100.518648] __sys_sendto+0xee/0x160
Fixes: c35fe4106b92 ("xfrm: Add mode handlers for IPsec on layer 2")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
net/xfrm/xfrm_device.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 6cc7f7f..f50d1f9 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -25,12 +25,10 @@ static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb,
struct xfrm_offload *xo = xfrm_offload(skb);
skb_reset_mac_len(skb);
- pskb_pull(skb, skb->mac_len + hsize + x->props.header_len);
-
- if (xo->flags & XFRM_GSO_SEGMENT) {
- skb_reset_transport_header(skb);
+ if (xo->flags & XFRM_GSO_SEGMENT)
skb->transport_header -= x->props.header_len;
- }
+
+ pskb_pull(skb, skb_transport_offset(skb) + x->props.header_len);
}
static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb,
--
2.1.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH ipsec] xfrm: do pskb_pull properly in __xfrm_transport_prep
2020-04-10 9:06 [PATCH ipsec] xfrm: do pskb_pull properly in __xfrm_transport_prep Xin Long
@ 2020-04-20 10:36 ` Steffen Klassert
0 siblings, 0 replies; 2+ messages in thread
From: Steffen Klassert @ 2020-04-20 10:36 UTC (permalink / raw)
To: Xin Long; +Cc: netdev, Herbert Xu, David S. Miller, Sabrina Dubroca
On Fri, Apr 10, 2020 at 05:06:31PM +0800, Xin Long wrote:
> For transport mode, when ipv6 nexthdr is set, the packet format might
> be like:
>
> ----------------------------------------------------
> | | dest | | | | ESP | ESP |
> | IP6 hdr| opts.| ESP | TCP | Data | Trailer | ICV |
> ----------------------------------------------------
>
> and in __xfrm_transport_prep():
>
> pskb_pull(skb, skb->mac_len + sizeof(ip6hdr) + x->props.header_len);
>
> it will pull the data pointer to the wrong position, as it missed the
> nexthdrs/dest opts.
>
> This patch is to fix it by using:
>
> pskb_pull(skb, skb_transport_offset(skb) + x->props.header_len);
>
> as we can be sure transport_header points to ESP header at that moment.
>
> It also fixes a panic when packets with ipv6 nexthdr are sent over
> esp6 transport mode:
>
> [ 100.473845] kernel BUG at net/core/skbuff.c:4325!
> [ 100.478517] RIP: 0010:__skb_to_sgvec+0x252/0x260
> [ 100.494355] Call Trace:
> [ 100.494829] skb_to_sgvec+0x11/0x40
> [ 100.495492] esp6_output_tail+0x12e/0x550 [esp6]
> [ 100.496358] esp6_xmit+0x1d5/0x260 [esp6_offload]
> [ 100.498029] validate_xmit_xfrm+0x22f/0x2e0
> [ 100.499604] __dev_queue_xmit+0x589/0x910
> [ 100.502928] ip6_finish_output2+0x2a5/0x5a0
> [ 100.503718] ip6_output+0x6c/0x120
> [ 100.505198] xfrm_output_resume+0x4bf/0x530
> [ 100.508683] xfrm6_output+0x3a/0xc0
> [ 100.513446] inet6_csk_xmit+0xa1/0xf0
> [ 100.517335] tcp_sendmsg+0x27/0x40
> [ 100.517977] sock_sendmsg+0x3e/0x60
> [ 100.518648] __sys_sendto+0xee/0x160
>
> Fixes: c35fe4106b92 ("xfrm: Add mode handlers for IPsec on layer 2")
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
Applied, thanks!
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2020-04-20 10:36 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-10 9:06 [PATCH ipsec] xfrm: do pskb_pull properly in __xfrm_transport_prep Xin Long
2020-04-20 10:36 ` Steffen Klassert
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.