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));
30 old = atomic_read(&ipv6_fragmentation_id);
34 } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old);
36 addr = rt->rt6i_dst.addr;
37 addr.s6_addr32[0] ^= (__force __be32)new;
38 fhdr->identification = htonl(secure_ipv6_id(addr.s6_addr32));
40 EXPORT_SYMBOL(ipv6_select_ident);
42 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
44 u16 offset = sizeof(struct ipv6hdr);
45 struct ipv6_opt_hdr *exthdr =
46 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
47 unsigned int packet_len = skb_tail_pointer(skb) -
48 skb_network_header(skb);
50 *nexthdr = &ipv6_hdr(skb)->nexthdr;
52 while (offset + 1 <= packet_len) {
62 #if IS_ENABLED(CONFIG_IPV6_MIP6)
63 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
73 offset += ipv6_optlen(exthdr);
74 *nexthdr = &exthdr->nexthdr;
75 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
81 EXPORT_SYMBOL(ip6_find_1stfragopt);
83 #if IS_ENABLED(CONFIG_IPV6)
84 int ip6_dst_hoplimit(struct dst_entry *dst)
86 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
88 struct net_device *dev = dst->dev;
89 struct inet6_dev *idev;
92 idev = __in6_dev_get(dev);
94 hoplimit = idev->cnf.hop_limit;
96 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
101 EXPORT_SYMBOL(ip6_dst_hoplimit);
104 int __ip6_local_out(struct sk_buff *skb)
108 len = skb->len - sizeof(struct ipv6hdr);
109 if (len > IPV6_MAXPLEN)
111 ipv6_hdr(skb)->payload_len = htons(len);
113 return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
114 skb_dst(skb)->dev, dst_output);
116 EXPORT_SYMBOL_GPL(__ip6_local_out);
118 int ip6_local_out(struct sk_buff *skb)
122 err = __ip6_local_out(skb);
123 if (likely(err == 1))
124 err = dst_output(skb);
128 EXPORT_SYMBOL_GPL(ip6_local_out);