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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 | #include <net/addrconf.h> |
9 | |
10 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) |
11 | { |
12 | static atomic_t ipv6_fragmentation_id; |
13 | int old, new; |
14 | |
15 | #if IS_ENABLED(CONFIG_IPV6) |
16 | if (rt && !(rt->dst.flags & DST_NOPEER)) { |
17 | struct inet_peer *peer; |
18 | struct net *net; |
19 | |
20 | net = dev_net(rt->dst.dev); |
21 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
22 | if (peer) { |
23 | fhdr->identification = htonl(inet_getid(peer, 0)); |
24 | inet_putpeer(peer); |
25 | return; |
26 | } |
27 | } |
28 | #endif |
29 | do { |
30 | old = atomic_read(&ipv6_fragmentation_id); |
31 | new = old + 1; |
32 | if (!new) |
33 | new = 1; |
34 | } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old); |
35 | fhdr->identification = htonl(new); |
36 | } |
37 | EXPORT_SYMBOL(ipv6_select_ident); |
38 | |
39 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
40 | { |
41 | u16 offset = sizeof(struct ipv6hdr); |
42 | struct ipv6_opt_hdr *exthdr = |
43 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
44 | unsigned int packet_len = skb_tail_pointer(skb) - |
45 | skb_network_header(skb); |
46 | int found_rhdr = 0; |
47 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
48 | |
49 | while (offset + 1 <= packet_len) { |
50 | |
51 | switch (**nexthdr) { |
52 | |
53 | case NEXTHDR_HOP: |
54 | break; |
55 | case NEXTHDR_ROUTING: |
56 | found_rhdr = 1; |
57 | break; |
58 | case NEXTHDR_DEST: |
59 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
60 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
61 | break; |
62 | #endif |
63 | if (found_rhdr) |
64 | return offset; |
65 | break; |
66 | default : |
67 | return offset; |
68 | } |
69 | |
70 | offset += ipv6_optlen(exthdr); |
71 | *nexthdr = &exthdr->nexthdr; |
72 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
73 | offset); |
74 | } |
75 | |
76 | return offset; |
77 | } |
78 | EXPORT_SYMBOL(ip6_find_1stfragopt); |
79 | |
80 | #if IS_ENABLED(CONFIG_IPV6) |
81 | int ip6_dst_hoplimit(struct dst_entry *dst) |
82 | { |
83 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
84 | if (hoplimit == 0) { |
85 | struct net_device *dev = dst->dev; |
86 | struct inet6_dev *idev; |
87 | |
88 | rcu_read_lock(); |
89 | idev = __in6_dev_get(dev); |
90 | if (idev) |
91 | hoplimit = idev->cnf.hop_limit; |
92 | else |
93 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
94 | rcu_read_unlock(); |
95 | } |
96 | return hoplimit; |
97 | } |
98 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
99 | #endif |
100 | |
101 | int __ip6_local_out(struct sk_buff *skb) |
102 | { |
103 | int len; |
104 | |
105 | len = skb->len - sizeof(struct ipv6hdr); |
106 | if (len > IPV6_MAXPLEN) |
107 | len = 0; |
108 | ipv6_hdr(skb)->payload_len = htons(len); |
109 | |
110 | return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
111 | skb_dst(skb)->dev, dst_output); |
112 | } |
113 | EXPORT_SYMBOL_GPL(__ip6_local_out); |
114 | |
115 | int ip6_local_out(struct sk_buff *skb) |
116 | { |
117 | int err; |
118 | |
119 | err = __ip6_local_out(skb); |
120 | if (likely(err == 1)) |
121 | err = dst_output(skb); |
122 | |
123 | return err; |
124 | } |
125 | EXPORT_SYMBOL_GPL(ip6_local_out); |
126 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9