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Linux/net/ipv6/xfrm6_mode_tunnel.c

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  1 /*
  2  * xfrm6_mode_tunnel.c - Tunnel mode encapsulation for IPv6.
  3  *
  4  * Copyright (C) 2002 USAGI/WIDE Project
  5  * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
  6  */
  7 
  8 #include <linux/gfp.h>
  9 #include <linux/init.h>
 10 #include <linux/kernel.h>
 11 #include <linux/module.h>
 12 #include <linux/skbuff.h>
 13 #include <linux/stringify.h>
 14 #include <net/dsfield.h>
 15 #include <net/dst.h>
 16 #include <net/inet_ecn.h>
 17 #include <net/ip6_route.h>
 18 #include <net/ipv6.h>
 19 #include <net/xfrm.h>
 20 
 21 static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
 22 {
 23         const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
 24         struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
 25 
 26         if (INET_ECN_is_ce(ipv6_get_dsfield(outer_iph)))
 27                 IP6_ECN_set_ce(inner_iph);
 28 }
 29 
 30 /* Add encapsulation header.
 31  *
 32  * The top IP header will be constructed per RFC 2401.
 33  */
 34 static int xfrm6_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
 35 {
 36         struct dst_entry *dst = skb_dst(skb);
 37         struct ipv6hdr *top_iph;
 38         int dsfield;
 39 
 40         skb_set_network_header(skb, -x->props.header_len);
 41         skb->mac_header = skb->network_header +
 42                           offsetof(struct ipv6hdr, nexthdr);
 43         skb->transport_header = skb->network_header + sizeof(*top_iph);
 44         top_iph = ipv6_hdr(skb);
 45 
 46         top_iph->version = 6;
 47 
 48         memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
 49                sizeof(top_iph->flow_lbl));
 50         top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
 51 
 52         if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
 53                 dsfield = 0;
 54         else
 55                 dsfield = XFRM_MODE_SKB_CB(skb)->tos;
 56         dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
 57         if (x->props.flags & XFRM_STATE_NOECN)
 58                 dsfield &= ~INET_ECN_MASK;
 59         ipv6_change_dsfield(top_iph, 0, dsfield);
 60         top_iph->hop_limit = ip6_dst_hoplimit(dst->child);
 61         top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
 62         top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
 63         return 0;
 64 }
 65 
 66 static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
 67 {
 68         int err = -EINVAL;
 69 
 70         if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
 71                 goto out;
 72         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
 73                 goto out;
 74 
 75         err = skb_unclone(skb, GFP_ATOMIC);
 76         if (err)
 77                 goto out;
 78 
 79         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 80                 ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
 81                                ipipv6_hdr(skb));
 82         if (!(x->props.flags & XFRM_STATE_NOECN))
 83                 ipip6_ecn_decapsulate(skb);
 84 
 85         skb_reset_network_header(skb);
 86         skb_mac_header_rebuild(skb);
 87 
 88         err = 0;
 89 
 90 out:
 91         return err;
 92 }
 93 
 94 static struct xfrm_mode xfrm6_tunnel_mode = {
 95         .input2 = xfrm6_mode_tunnel_input,
 96         .input = xfrm_prepare_input,
 97         .output2 = xfrm6_mode_tunnel_output,
 98         .output = xfrm6_prepare_output,
 99         .owner = THIS_MODULE,
100         .encap = XFRM_MODE_TUNNEL,
101         .flags = XFRM_MODE_FLAG_TUNNEL,
102 };
103 
104 static int __init xfrm6_mode_tunnel_init(void)
105 {
106         return xfrm_register_mode(&xfrm6_tunnel_mode, AF_INET6);
107 }
108 
109 static void __exit xfrm6_mode_tunnel_exit(void)
110 {
111         int err;
112 
113         err = xfrm_unregister_mode(&xfrm6_tunnel_mode, AF_INET6);
114         BUG_ON(err);
115 }
116 
117 module_init(xfrm6_mode_tunnel_init);
118 module_exit(xfrm6_mode_tunnel_exit);
119 MODULE_LICENSE("GPL");
120 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TUNNEL);
121 

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