diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-05-29 13:25:31 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-05-30 14:18:17 -0700 |
| commit | c8b17be0b7a45d707fc202c11d257c25bc3952b8 (patch) | |
| tree | ebf07ec10ea419e1be811da58d0c09b73ce1d962 /include/net/ip.h | |
| parent | d48ecb40b5b5a156ae3658dc336bfc29ea502eb6 (diff) | |
| download | linux-c8b17be0b7a45d707fc202c11d257c25bc3952b8.tar.gz | |
net: ipv4: add skbuff fraglist splitter
This patch adds the skbuff fraglist splitter. This API provides an
iterator to transform the fraglist into single skbuff objects, it
consists of:
* ip_fraglist_init(), that initializes the internal state of the
fraglist splitter.
* ip_fraglist_prepare(), that restores the IPv4 header on the
fragments.
* ip_fraglist_next(), that retrieves the fragment from the fraglist and
it updates the internal state of the splitter to point to the next
fragment skbuff in the fraglist.
The ip_fraglist_iter object stores the internal state of the iterator.
This code has been extracted from ip_do_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/ip.h')
| -rw-r--r-- | include/net/ip.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/net/ip.h b/include/net/ip.h index 2d3cce7c3e8a92..be899677504b18 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -165,6 +165,29 @@ int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, int (*output)(struct net *, struct sock *, struct sk_buff *)); + +struct ip_fraglist_iter { + struct sk_buff *frag_list; + struct sk_buff *frag; + struct iphdr *iph; + int offset; + unsigned int hlen; +}; + +void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph, + unsigned int hlen, struct ip_fraglist_iter *iter); +void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter); + +static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter) +{ + struct sk_buff *skb = iter->frag; + + iter->frag = skb->next; + skb_mark_not_on_list(skb); + + return skb; +} + void ip_send_check(struct iphdr *ip); int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |