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xfrm: interface: fix ipv4 pmtu check to honor ip header df

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Frag needed should only be sent if the header enables DF.

This fix allows packets larger than MTU to pass the xfrm interface
and be fragmented after encapsulation, aligning behavior with
non-interface xfrm.

Fixes: f203b76d78 ("xfrm: Add virtual xfrm interfaces")
Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Eyal Birger 2021-02-20 15:01:15 +02:00 committed by Steffen Klassert
parent 3a2eb515d1
commit 8fc0e3b6a8
1 changed files with 3 additions and 0 deletions
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3
net/xfrm/xfrm_interface.c
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@ -306,6 +306,8 @@ xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
} else {
if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
goto xmit;
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
htonl(mtu));
}
@ -314,6 +316,7 @@ xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
return -EMSGSIZE;
}
xmit:
xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev)));
skb_dst_set(skb, dst);
skb->dev = tdev;