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>
8 #include <net/ip6_fib.h>
9 #include <net/addrconf.h>
10 #include <net/secure_seq.h>
11 #include <linux/netfilter.h>
13 static u32 __ipv6_select_ident(struct net *net,
14 const struct in6_addr *dst,
15 const struct in6_addr *src)
26 /* This function exists only for tap drivers that must support broken
27 * clients requesting UFO without specifying an IPv6 fragment ID.
29 * This is similar to ipv6_select_ident() but we use an independent hash
30 * seed to limit information leakage.
32 * The network header must be set before calling this.
34 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb)
36 struct in6_addr buf[2];
37 struct in6_addr *addrs;
40 addrs = skb_header_pointer(skb,
41 skb_network_offset(skb) +
42 offsetof(struct ipv6hdr, saddr),
47 id = __ipv6_select_ident(net, &addrs[1], &addrs[0]);
50 EXPORT_SYMBOL_GPL(ipv6_proxy_select_ident);
52 __be32 ipv6_select_ident(struct net *net,
53 const struct in6_addr *daddr,
54 const struct in6_addr *saddr)
58 id = __ipv6_select_ident(net, daddr, saddr);
61 EXPORT_SYMBOL(ipv6_select_ident);
63 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
65 unsigned int offset = sizeof(struct ipv6hdr);
66 unsigned int packet_len = skb_tail_pointer(skb) -
67 skb_network_header(skb);
69 *nexthdr = &ipv6_hdr(skb)->nexthdr;
71 while (offset <= packet_len) {
72 struct ipv6_opt_hdr *exthdr;
82 #if IS_ENABLED(CONFIG_IPV6_MIP6)
83 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
93 if (offset + sizeof(struct ipv6_opt_hdr) > packet_len)
96 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
98 offset += ipv6_optlen(exthdr);
99 if (offset > IPV6_MAXPLEN)
101 *nexthdr = &exthdr->nexthdr;
106 EXPORT_SYMBOL(ip6_find_1stfragopt);
108 #if IS_ENABLED(CONFIG_IPV6)
109 int ip6_dst_hoplimit(struct dst_entry *dst)
111 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
113 struct net_device *dev = dst->dev;
114 struct inet6_dev *idev;
117 idev = __in6_dev_get(dev);
119 hoplimit = idev->cnf.hop_limit;
121 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
126 EXPORT_SYMBOL(ip6_dst_hoplimit);
129 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
133 len = skb->len - sizeof(struct ipv6hdr);
134 if (len > IPV6_MAXPLEN)
136 ipv6_hdr(skb)->payload_len = htons(len);
137 IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
139 /* if egress device is enslaved to an L3 master device pass the
140 * skb to its handler for processing
142 skb = l3mdev_ip6_out(sk, skb);
146 skb->protocol = htons(ETH_P_IPV6);
148 return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
149 net, sk, skb, NULL, skb_dst(skb)->dev,
152 EXPORT_SYMBOL_GPL(__ip6_local_out);
154 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
158 err = __ip6_local_out(net, sk, skb);
159 if (likely(err == 1))
160 err = dst_output(net, sk, skb);
164 EXPORT_SYMBOL_GPL(ip6_local_out);