diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-05-29 13:25:32 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-05-30 14:18:17 -0700 |
| commit | 0feca6190f88a1b7c9a9b9cdf41824e3ea4ba02c (patch) | |
| tree | 0ac64bce8eb6ed61978c95393c7abe23ea710f99 /include/net | |
| parent | c8b17be0b7a45d707fc202c11d257c25bc3952b8 (diff) | |
net: ipv6: add skbuff fraglist splitter
This patch adds the skbuff fraglist split iterator. This API provides an
iterator to transform the fraglist into single skbuff objects, it
consists of:
* ip6_fraglist_init(), that initializes the internal state of the
fraglist iterator.
* ip6_fraglist_prepare(), that restores the IPv6 header on the fragment.
* ip6_fraglist_next(), that retrieves the fragment from the fraglist and
updates the internal state of the iterator to point to the next
fragment in the fraglist.
The ip6_fraglist_iter object stores the internal state of the iterator.
This code has been extracted from ip6_fragment(). Symbols are also
exported to allow to reuse this iterator from the bridge codepath to
build its own refragmentation routine by reusing the existing codebase.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/ipv6.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index daf80863d3a5..acefbc718abe 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -154,6 +154,31 @@ struct frag_hdr { #define IP6_MF 0x0001 #define IP6_OFFSET 0xFFF8 +struct ip6_fraglist_iter { + struct ipv6hdr *tmp_hdr; + struct sk_buff *frag_list; + struct sk_buff *frag; + int offset; + unsigned int hlen; + __be32 frag_id; + u8 nexthdr; +}; + +int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, + u8 nexthdr, __be32 frag_id, + struct ip6_fraglist_iter *iter); +void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter); + +static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter) +{ + struct sk_buff *skb = iter->frag; + + iter->frag = skb->next; + skb_mark_not_on_list(skb); + + return skb; +} + #define IP6_REPLY_MARK(net, mark) \ ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) |