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netfilter: use nf_ip6_check_hbh_len in nf_ct_skb_network_trim

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For IPv6 Jumbo packets, the ipv6_hdr(skb)->payload_len is always 0,
and its real payload_len ( > 65535) is saved in hbh exthdr. With 0
length for the jumbo packets, all data and exthdr will be trimmed
in nf_ct_skb_network_trim().

This patch is to call nf_ip6_check_hbh_len() to get real pkt_len
of the IPv6 packet, similar to br_validate_ipv6().

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Xin Long 2023-03-07 16:31:31 -05:00 committed by Florian Westphal
parent 28e144cf5f
commit eaafdaa3e9
1 changed files with 9 additions and 2 deletions
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11
net/netfilter/nf_conntrack_ovs.c
View file

@ -6,6 +6,7 @@
#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
#include <net/ipv6_frag.h>
#include <net/ip.h>
#include <linux/netfilter_ipv6.h>
/* 'skb' should already be pulled to nh_ofs. */
int nf_ct_helper(struct sk_buff *skb, struct nf_conn *ct,
@ -120,8 +121,14 @@ int nf_ct_skb_network_trim(struct sk_buff *skb, int family)
len = skb_ip_totlen(skb);
break;
case NFPROTO_IPV6:
len = sizeof(struct ipv6hdr)
+ ntohs(ipv6_hdr(skb)->payload_len);
len = ntohs(ipv6_hdr(skb)->payload_len);
if (ipv6_hdr(skb)->nexthdr == NEXTHDR_HOP) {
int err = nf_ip6_check_hbh_len(skb, &len);
if (err)
return err;
}
len += sizeof(struct ipv6hdr);
break;
default:
len = skb->len;