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alistair23-linux
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seg6: fix skb transport_header after decap_and_validate() 

in the receive path (more precisely in ip6_rcv_core()) the
skb->transport_header is set to skb->network_header + sizeof(*hdr). As a
consequence, after routing operations, destination input expects to find
skb->transport_header correctly set to the next protocol (or extension
header) that follows the network protocol. However, decap behaviors (DX*,
DT*) remove the outer IPv6 and SRH extension and do not set again the
skb->transport_header pointer correctly. For this reason, the patch sets
the skb->transport_header to the skb->network_header + sizeof(hdr) in each
DX* and DT* behavior.

Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: David S. Miller <davem@davemloft.net>
alistair/sunxi64-5.4-dsi
Andrea Mayer 2019-11-16 16:05:53 +01:00 committed by David S. Miller
parent 7f91ed8c4f
commit c71644d00f
1 changed files with 6 additions and 0 deletions
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6
net/ipv6/seg6_local.c
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@ -341,6 +341,8 @@ static int input_action_end_dx6(struct sk_buff *skb,
if (!ipv6_addr_any(&slwt->nh6))
nhaddr = &slwt->nh6;
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
seg6_lookup_nexthop(skb, nhaddr, 0);
return dst_input(skb);
@ -370,6 +372,8 @@ static int input_action_end_dx4(struct sk_buff *skb,
skb_dst_drop(skb);
skb_set_transport_header(skb, sizeof(struct iphdr));
err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
if (err)
goto drop;
@ -390,6 +394,8 @@ static int input_action_end_dt6(struct sk_buff *skb,
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto drop;
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
seg6_lookup_nexthop(skb, NULL, slwt->table);
return dst_input(skb);