diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-05-29 14:25:34 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-05-31 00:18:17 +0300 |
| commit | 8a6a1f17640198f7daa5cfcce9a74e3674ce3b00 (patch) | |
| tree | 59f780f0495a97cd8961d3190b9cb96d2c44da49 /include/net/ipv6.h | |
| parent | 065ff79f8881e6267f4c29abb476d697eb87bfba (diff) | |
| download | linux-8a6a1f17640198f7daa5cfcce9a74e3674ce3b00.tar.xz | |
net: ipv6: split skbuff into fragments transformer
This patch exposes a new API to refragment a skbuff. This allows you to
split either a linear skbuff or to force the refragmentation of an
existing fraglist using a different mtu. The API consists of:
* ip6_frag_init(), that initializes the internal state of the transformer.
* ip6_frag_next(), that allows you to fetch the next fragment. This function
internally allocates the skbuff that represents the fragment, it pushes
the IPv6 header, and it also copies the payload for each fragment.
The ip6_frag_state object stores the internal state of the splitter.
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/ipv6.h')
| -rw-r--r-- | include/net/ipv6.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index acefbc718abe..21bb830e9679 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -179,6 +179,25 @@ static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter) return skb; } +struct ip6_frag_state { + u8 *prevhdr; + unsigned int hlen; + unsigned int mtu; + unsigned int left; + int offset; + int ptr; + int hroom; + int troom; + __be32 frag_id; + u8 nexthdr; +}; + +void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, + unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, + u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state); +struct sk_buff *ip6_frag_next(struct sk_buff *skb, + struct ip6_frag_state *state); + #define IP6_REPLY_MARK(net, mark) \ ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) |