summaryrefslogtreecommitdiff
path: root/net/ipv6/seg6_iptunnel.c
diff options
context:
space:
mode:
authorAndrea Mayer <andrea.mayer@uniroma2.it>2021-12-08 22:54:09 +0300
committerJakub Kicinski <kuba@kernel.org>2021-12-09 18:55:42 +0300
commitae68d93354e5bf5191ee673982251864ea24dd5c (patch)
treecb55dfd7dcc6b645f1b212fb3dae5cbe376b4627 /net/ipv6/seg6_iptunnel.c
parentc56c96303e9289cc34716b1179597b6f470833de (diff)
downloadlinux-ae68d93354e5bf5191ee673982251864ea24dd5c.tar.xz
seg6: fix the iif in the IPv6 socket control block
When an IPv4 packet is received, the ip_rcv_core(...) sets the receiving interface index into the IPv4 socket control block (v5.16-rc4, net/ipv4/ip_input.c line 510): IPCB(skb)->iif = skb->skb_iif; If that IPv4 packet is meant to be encapsulated in an outer IPv6+SRH header, the seg6_do_srh_encap(...) performs the required encapsulation. In this case, the seg6_do_srh_encap function clears the IPv6 socket control block (v5.16-rc4 net/ipv6/seg6_iptunnel.c line 163): memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); The memset(...) was introduced in commit ef489749aae5 ("ipv6: sr: clear IP6CB(skb) on SRH ip4ip6 encapsulation") a long time ago (2019-01-29). Since the IPv6 socket control block and the IPv4 socket control block share the same memory area (skb->cb), the receiving interface index info is lost (IP6CB(skb)->iif is set to zero). As a side effect, that condition triggers a NULL pointer dereference if commit 0857d6f8c759 ("ipv6: When forwarding count rx stats on the orig netdev") is applied. To fix that issue, we set the IP6CB(skb)->iif with the index of the receiving interface once again. Fixes: ef489749aae5 ("ipv6: sr: clear IP6CB(skb) on SRH ip4ip6 encapsulation") Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20211208195409.12169-1-andrea.mayer@uniroma2.it Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv6/seg6_iptunnel.c')
-rw-r--r--net/ipv6/seg6_iptunnel.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index 3adc5d9211ad..d64855010948 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -161,6 +161,14 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
hdr->hop_limit = ip6_dst_hoplimit(skb_dst(skb));
memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
+
+ /* the control block has been erased, so we have to set the
+ * iif once again.
+ * We read the receiving interface index directly from the
+ * skb->skb_iif as it is done in the IPv4 receiving path (i.e.:
+ * ip_rcv_core(...)).
+ */
+ IP6CB(skb)->iif = skb->skb_iif;
}
hdr->nexthdr = NEXTHDR_ROUTING;