path: root/include/net/ipv6.h
diff options
authorPablo Neira Ayuso <pablo@netfilter.org>2019-05-29 13:25:32 +0200
committerDavid S. Miller <davem@davemloft.net>2019-05-30 14:18:17 -0700
commit0feca6190f88a1b7c9a9b9cdf41824e3ea4ba02c (patch)
tree0ac64bce8eb6ed61978c95393c7abe23ea710f99 /include/net/ipv6.h
parentnet: ipv4: add skbuff fraglist splitter (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 '')
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)