| Message ID | 8099f9355ff059dbcbde40ae0b2a1c377844706f.1622319798.git.lucien.xin@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [ipsec] xfrm: remove the fragment check for ipv6 beet mode | expand |
On Sat, May 29, 2021 at 04:23:18PM -0400, Xin Long wrote: > In commit 68dc022d04eb ("xfrm: BEET mode doesn't support fragments > for inner packets"), it tried to fix the issue that in TX side the > packet is fragmented before the ESP encapping while in the RX side > the fragments always get reassembled before decapping with ESP. > > This is not true for IPv6. IPv6 is different, and it's using exthdr > to save fragment info, as well as the ESP info. Exthdrs are added > in TX and processed in RX both in order. So in the above case, the > ESP decapping will be done earlier than the fragment reassembling > in TX side. > > Here just remove the fragment check for the IPv6 inner packets to > recover the fragments support for BEET mode. > > Fixes: 68dc022d04eb ("xfrm: BEET mode doesn't support fragments for inner packets") > Reported-by: Xiumei Mu <xmu@redhat.com> > Signed-off-by: Xin Long <lucien.xin@gmail.com> Applied, thanks Xin!
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c index e4cb0ff4dcf4..ac907b9d32d1 100644 --- a/net/xfrm/xfrm_output.c +++ b/net/xfrm/xfrm_output.c @@ -711,15 +711,8 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb) static int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb) { #if IS_ENABLED(CONFIG_IPV6) - unsigned int ptr = 0; int err; - if (x->outer_mode.encap == XFRM_MODE_BEET && - ipv6_find_hdr(skb, &ptr, NEXTHDR_FRAGMENT, NULL, NULL) >= 0) { - net_warn_ratelimited("BEET mode doesn't support inner IPv6 fragments\n"); - return -EAFNOSUPPORT; - } - err = xfrm6_tunnel_check_size(skb); if (err) return err;
In commit 68dc022d04eb ("xfrm: BEET mode doesn't support fragments for inner packets"), it tried to fix the issue that in TX side the packet is fragmented before the ESP encapping while in the RX side the fragments always get reassembled before decapping with ESP. This is not true for IPv6. IPv6 is different, and it's using exthdr to save fragment info, as well as the ESP info. Exthdrs are added in TX and processed in RX both in order. So in the above case, the ESP decapping will be done earlier than the fragment reassembling in TX side. Here just remove the fragment check for the IPv6 inner packets to recover the fragments support for BEET mode. Fixes: 68dc022d04eb ("xfrm: BEET mode doesn't support fragments for inner packets") Reported-by: Xiumei Mu <xmu@redhat.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> --- net/xfrm/xfrm_output.c | 7 ------- 1 file changed, 7 deletions(-)