diff options
Diffstat (limited to 'net/ipv6/exthdrs_core.c')
| -rw-r--r-- | net/ipv6/exthdrs_core.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c index 37f548b7f6d..72957f4a7c6 100644 --- a/net/ipv6/exthdrs_core.c +++ b/net/ipv6/exthdrs_core.c @@ -57,6 +57,9 @@ int ipv6_ext_hdr(u8 nexthdr) * it returns NULL. * - First fragment header is skipped, not-first ones * are considered as unparsable. + * - Reports the offset field of the final fragment header so it is + * possible to tell whether this is a first fragment, later fragment, + * or not fragmented. * - ESP is unparsable for now and considered like * normal payload protocol. * - Note also special handling of AUTH header. Thanks to IPsec wizards. @@ -64,10 +67,13 @@ int ipv6_ext_hdr(u8 nexthdr) * --ANK (980726) */ -int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp) +int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp, + __be16 *frag_offp) { u8 nexthdr = *nexthdrp; + *frag_offp = 0; + while (ipv6_ext_hdr(nexthdr)) { struct ipv6_opt_hdr _hdr, *hp; int hdrlen; @@ -87,7 +93,8 @@ int ipv6_skip_exthdr(const struct sk_buff *skb, int start, u8 *nexthdrp) if (fp == NULL) return -1; - if (ntohs(*fp) & ~0x7) + *frag_offp = *fp; + if (ntohs(*frag_offp) & ~0x7) break; hdrlen = 8; } else if (nexthdr == NEXTHDR_AUTH) |