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Commit | Line | Data |
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3c73a036 VY |
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); | |
29a3cad5 SH |
43 | unsigned int packet_len = skb_tail_pointer(skb) - |
44 | skb_network_header(skb); | |
3c73a036 VY |
45 | int found_rhdr = 0; |
46 | *nexthdr = &ipv6_hdr(skb)->nexthdr; | |
47 | ||
48 | while (offset + 1 <= packet_len) { | |
49 | ||
50 | switch (**nexthdr) { | |
51 | ||
52 | case NEXTHDR_HOP: | |
53 | break; | |
54 | case NEXTHDR_ROUTING: | |
55 | found_rhdr = 1; | |
56 | break; | |
57 | case NEXTHDR_DEST: | |
58 | #if IS_ENABLED(CONFIG_IPV6_MIP6) | |
59 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) | |
60 | break; | |
61 | #endif | |
62 | if (found_rhdr) | |
63 | return offset; | |
64 | break; | |
65 | default : | |
66 | return offset; | |
67 | } | |
68 | ||
69 | offset += ipv6_optlen(exthdr); | |
70 | *nexthdr = &exthdr->nexthdr; | |
71 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + | |
72 | offset); | |
73 | } | |
74 | ||
75 | return offset; | |
76 | } | |
77 | EXPORT_SYMBOL(ip6_find_1stfragopt); |