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| author | Xin Long <lucien.xin@gmail.com> | 2023-03-07 16:31:29 -0500 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2023-03-08 14:25:40 +0100 |
| commit | 0b24bd71a6c0214aaa2115302dd6598b89d2fa8a (patch) | |
| tree | 1783db875fe7e229fd2f05f4cfc4874052acd17c | |
| parent | a7f1a2f43e683c8ffca691d45f2cb32c052158fa (diff) | |
| download | linux-0b24bd71a6c0214aaa2115302dd6598b89d2fa8a.tar.gz linux-0b24bd71a6c0214aaa2115302dd6598b89d2fa8a.tar.bz2 linux-0b24bd71a6c0214aaa2115302dd6598b89d2fa8a.zip | |
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>
| -rw-r--r-- | net/bridge/br_netfilter_ipv6.c | 33 |
1 files changed, 14 insertions, 19 deletions
diff --git a/net/bridge/br_netfilter_ipv6.c b/net/bridge/br_netfilter_ipv6.c index 8be3c5c8b925..a0d6dfb3e255 100644 --- a/net/bridge/br_netfilter_ipv6.c +++ b/net/bridge/br_netfilter_ipv6.c @@ -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; @@ -114,22 +112,19 @@ int br_validate_ipv6(struct net *net, struct sk_buff *skb) goto inhdr_error; pkt_len = ntohs(hdr->payload_len); + if (hdr->nexthdr == NEXTHDR_HOP && br_nf_check_hbh_len(skb, &pkt_len)) + goto drop; - 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 (pkt_len + ip6h_len > skb->len) { + __IP6_INC_STATS(net, idev, + IPSTATS_MIB_INTRUNCATEDPKTS); + goto drop; } - if (hdr->nexthdr == NEXTHDR_HOP && br_nf_check_hbh_len(skb)) + 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 |