blob: 5ec867e4a8b74fb23d8fdd2bcf9e0dce52f94455 [file] [log] [blame]
Vlad Yasevich3c73a032012-11-15 08:49:20 +00001/*
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>
Cong Wang3ce9b352013-08-31 13:44:28 +08008#include <net/addrconf.h>
Hannes Frederic Sowa6dfac5c2014-03-30 18:28:03 +02009#include <net/secure_seq.h>
Vlad Yasevich3c73a032012-11-15 08:49:20 +000010
Vlad Yasevich3c73a032012-11-15 08:49:20 +000011int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
12{
13 u16 offset = sizeof(struct ipv6hdr);
14 struct ipv6_opt_hdr *exthdr =
15 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
Simon Horman29a3cad2013-05-28 20:34:26 +000016 unsigned int packet_len = skb_tail_pointer(skb) -
17 skb_network_header(skb);
Vlad Yasevich3c73a032012-11-15 08:49:20 +000018 int found_rhdr = 0;
19 *nexthdr = &ipv6_hdr(skb)->nexthdr;
20
21 while (offset + 1 <= packet_len) {
22
23 switch (**nexthdr) {
24
25 case NEXTHDR_HOP:
26 break;
27 case NEXTHDR_ROUTING:
28 found_rhdr = 1;
29 break;
30 case NEXTHDR_DEST:
31#if IS_ENABLED(CONFIG_IPV6_MIP6)
32 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
33 break;
34#endif
35 if (found_rhdr)
36 return offset;
37 break;
38 default :
39 return offset;
40 }
41
42 offset += ipv6_optlen(exthdr);
43 *nexthdr = &exthdr->nexthdr;
44 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
45 offset);
46 }
47
48 return offset;
49}
50EXPORT_SYMBOL(ip6_find_1stfragopt);
Cong Wang3ce9b352013-08-31 13:44:28 +080051
52#if IS_ENABLED(CONFIG_IPV6)
53int ip6_dst_hoplimit(struct dst_entry *dst)
54{
55 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
56 if (hoplimit == 0) {
57 struct net_device *dev = dst->dev;
58 struct inet6_dev *idev;
59
60 rcu_read_lock();
61 idev = __in6_dev_get(dev);
62 if (idev)
63 hoplimit = idev->cnf.hop_limit;
64 else
65 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
66 rcu_read_unlock();
67 }
68 return hoplimit;
69}
70EXPORT_SYMBOL(ip6_dst_hoplimit);
71#endif
Cong Wang788787b2013-08-31 13:44:29 +080072
73int __ip6_local_out(struct sk_buff *skb)
74{
75 int len;
76
77 len = skb->len - sizeof(struct ipv6hdr);
78 if (len > IPV6_MAXPLEN)
79 len = 0;
80 ipv6_hdr(skb)->payload_len = htons(len);
huizhangf6c20c52014-06-09 12:37:25 +080081 IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
Cong Wang788787b2013-08-31 13:44:29 +080082
83 return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
84 skb_dst(skb)->dev, dst_output);
85}
86EXPORT_SYMBOL_GPL(__ip6_local_out);
87
88int ip6_local_out(struct sk_buff *skb)
89{
90 int err;
91
92 err = __ip6_local_out(skb);
93 if (likely(err == 1))
94 err = dst_output(skb);
95
96 return err;
97}
98EXPORT_SYMBOL_GPL(ip6_local_out);