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.
5 #include <linux/export.h>
7 #include <net/ip6_fib.h>
8 #include <net/addrconf.h>
9 #include <net/secure_seq.h>
11 void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
13 static atomic_t ipv6_fragmentation_id;
17 #if IS_ENABLED(CONFIG_IPV6)
18 struct inet_peer *peer;
21 net = dev_net(rt->dst.dev);
22 peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
24 fhdr->identification = htonl(inet_getid(peer, 0));
29 ident = atomic_inc_return(&ipv6_fragmentation_id);
31 addr = rt->rt6i_dst.addr;
32 addr.s6_addr32[0] ^= (__force __be32)ident;
33 fhdr->identification = htonl(secure_ipv6_id(addr.s6_addr32));
35 EXPORT_SYMBOL(ipv6_select_ident);
37 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
39 u16 offset = sizeof(struct ipv6hdr);
40 struct ipv6_opt_hdr *exthdr =
41 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
42 unsigned int packet_len = skb_tail_pointer(skb) -
43 skb_network_header(skb);
45 *nexthdr = &ipv6_hdr(skb)->nexthdr;
47 while (offset + 1 <= packet_len) {
57 #if IS_ENABLED(CONFIG_IPV6_MIP6)
58 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
68 offset += ipv6_optlen(exthdr);
69 *nexthdr = &exthdr->nexthdr;
70 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
76 EXPORT_SYMBOL(ip6_find_1stfragopt);
78 #if IS_ENABLED(CONFIG_IPV6)
79 int ip6_dst_hoplimit(struct dst_entry *dst)
81 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
83 struct net_device *dev = dst->dev;
84 struct inet6_dev *idev;
87 idev = __in6_dev_get(dev);
89 hoplimit = idev->cnf.hop_limit;
91 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
96 EXPORT_SYMBOL(ip6_dst_hoplimit);
99 int __ip6_local_out(struct sk_buff *skb)
103 len = skb->len - sizeof(struct ipv6hdr);
104 if (len > IPV6_MAXPLEN)
106 ipv6_hdr(skb)->payload_len = htons(len);
108 return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
109 skb_dst(skb)->dev, dst_output);
111 EXPORT_SYMBOL_GPL(__ip6_local_out);
113 int ip6_local_out(struct sk_buff *skb)
117 err = __ip6_local_out(skb);
118 if (likely(err == 1))
119 err = dst_output(skb);
123 EXPORT_SYMBOL_GPL(ip6_local_out);