Merge branch 'master' of git://1984.lsi.us.es/nf-next
[linux-3.10.git] / net / ipv6 / output_core.c
1 /*
2  * IPv6 library code, needed by static components when full IPv6 support is
3  * not configured or static.  These functions are needed by GSO/GRO implementation.
4  */
5 #include <linux/export.h>
6 #include <net/ipv6.h>
7 #include <net/ip6_fib.h>
8
9 void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
10 {
11         static atomic_t ipv6_fragmentation_id;
12         int old, new;
13
14 #if IS_ENABLED(CONFIG_IPV6)
15         if (rt && !(rt->dst.flags & DST_NOPEER)) {
16                 struct inet_peer *peer;
17                 struct net *net;
18
19                 net = dev_net(rt->dst.dev);
20                 peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
21                 if (peer) {
22                         fhdr->identification = htonl(inet_getid(peer, 0));
23                         inet_putpeer(peer);
24                         return;
25                 }
26         }
27 #endif
28         do {
29                 old = atomic_read(&ipv6_fragmentation_id);
30                 new = old + 1;
31                 if (!new)
32                         new = 1;
33         } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old);
34         fhdr->identification = htonl(new);
35 }
36 EXPORT_SYMBOL(ipv6_select_ident);
37
38 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
39 {
40         u16 offset = sizeof(struct ipv6hdr);
41         struct ipv6_opt_hdr *exthdr =
42                                 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
43         unsigned int packet_len = skb->tail - skb->network_header;
44         int found_rhdr = 0;
45         *nexthdr = &ipv6_hdr(skb)->nexthdr;
46
47         while (offset + 1 <= packet_len) {
48
49                 switch (**nexthdr) {
50
51                 case NEXTHDR_HOP:
52                         break;
53                 case NEXTHDR_ROUTING:
54                         found_rhdr = 1;
55                         break;
56                 case NEXTHDR_DEST:
57 #if IS_ENABLED(CONFIG_IPV6_MIP6)
58                         if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
59                                 break;
60 #endif
61                         if (found_rhdr)
62                                 return offset;
63                         break;
64                 default :
65                         return offset;
66                 }
67
68                 offset += ipv6_optlen(exthdr);
69                 *nexthdr = &exthdr->nexthdr;
70                 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
71                                                  offset);
72         }
73
74         return offset;
75 }
76 EXPORT_SYMBOL(ip6_find_1stfragopt);