diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_ovs.c')
| -rw-r--r-- | net/netfilter/nf_conntrack_ovs.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_ovs.c b/net/netfilter/nf_conntrack_ovs.c index eff4d53f8b8c..c60ef71d1aea 100644 --- a/net/netfilter/nf_conntrack_ovs.c +++ b/net/netfilter/nf_conntrack_ovs.c @@ -102,3 +102,29 @@ int nf_ct_add_helper(struct nf_conn *ct, const char *name, u8 family, return ret; } EXPORT_SYMBOL_GPL(nf_ct_add_helper); + +/* Trim the skb to the length specified by the IP/IPv6 header, + * removing any trailing lower-layer padding. This prepares the skb + * for higher-layer processing that assumes skb->len excludes padding + * (such as nf_ip_checksum). The caller needs to pull the skb to the + * network header, and ensure ip_hdr/ipv6_hdr points to valid data. + */ +int nf_ct_skb_network_trim(struct sk_buff *skb, int family) +{ + unsigned int len; + + switch (family) { + case NFPROTO_IPV4: + len = skb_ip_totlen(skb); + break; + case NFPROTO_IPV6: + len = sizeof(struct ipv6hdr) + + ntohs(ipv6_hdr(skb)->payload_len); + break; + default: + len = skb->len; + } + + return pskb_trim_rcsum(skb, len); +} +EXPORT_SYMBOL_GPL(nf_ct_skb_network_trim); |