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netfilter: bridge: move pskb_trim_rcsum out of br_nf_check_hbh_len 

br_nf_check_hbh_len() is a function to check the Hop-by-hop option
header, and shouldn't do pskb_trim_rcsum() there. This patch is to
pass pkt_len out to br_validate_ipv6() and do pskb_trim_rcsum()
after calling br_validate_ipv6() instead.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Acked-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 16:31:29 -05:00 committed by Florian Westphal
parent a7f1a2f43e
commit 0b24bd71a6
1 changed files with 16 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
net/bridge/br_netfilter_ipv6.c
View File

@ -43,11 +43,10 @@
/* We only check the length. A bridge shouldn't do any hop-by-hop stuff
* anyway
*/
static int br_nf_check_hbh_len(struct sk_buff *skb)
static int br_nf_check_hbh_len(struct sk_buff *skb, u32 *plen)
{
int len, off = sizeof(struct ipv6hdr);
unsigned char *nh;
u32 pkt_len;
if (!pskb_may_pull(skb, off + 8))
return -1;
@ -75,6 +74,8 @@ static int br_nf_check_hbh_len(struct sk_buff *skb)
return -1;
if (nh[off] == IPV6_TLV_JUMBO) {
u32 pkt_len;
if (nh[off + 1] != 4 || (off & 3) != 2)
return -1;
pkt_len = ntohl(*(__be32 *)(nh + off + 2));
@ -83,10 +84,7 @@ static int br_nf_check_hbh_len(struct sk_buff *skb)
return -1;
if (pkt_len > skb->len - sizeof(struct ipv6hdr))
return -1;
if (pskb_trim_rcsum(skb,
pkt_len + sizeof(struct ipv6hdr)))
return -1;
nh = skb_network_header(skb);
*plen = pkt_len;
}
off += optlen;
len -= optlen;
@ -114,23 +112,20 @@ int br_validate_ipv6(struct net *net, struct sk_buff *skb)
goto inhdr_error;
pkt_len = ntohs(hdr->payload_len);
if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
if (pkt_len + ip6h_len > skb->len) {
__IP6_INC_STATS(net, idev,
IPSTATS_MIB_INTRUNCATEDPKTS);
goto drop;
}
if (pskb_trim_rcsum(skb, pkt_len + ip6h_len)) {
__IP6_INC_STATS(net, idev,
IPSTATS_MIB_INDISCARDS);
goto drop;
}
hdr = ipv6_hdr(skb);
}
if (hdr->nexthdr == NEXTHDR_HOP && br_nf_check_hbh_len(skb))
if (hdr->nexthdr == NEXTHDR_HOP && br_nf_check_hbh_len(skb, &pkt_len))
goto drop;
if (pkt_len + ip6h_len > skb->len) {
__IP6_INC_STATS(net, idev,
IPSTATS_MIB_INTRUNCATEDPKTS);
goto drop;
}
if (pskb_trim_rcsum(skb, pkt_len + ip6h_len)) {
__IP6_INC_STATS(net, idev,
IPSTATS_MIB_INDISCARDS);
goto drop;
}
memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
/* No IP options in IPv6 header; however it should be
* checked if some next headers need special treatment