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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         struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
 24 
 25         if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
 26                 IP6_ECN_set_ce(skb, inner_iph);
 27 }
 28 
 29 /* Add encapsulation header.
 30  *
 31  * The top IP header will be constructed per RFC 2401.
 32  */
 33 static int xfrm6_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
 34 {
 35         struct dst_entry *dst = skb_dst(skb);
 36         struct ipv6hdr *top_iph;
 37         int dsfield;
 38 
 39         skb_set_network_header(skb, -x->props.header_len);
 40         skb->mac_header = skb->network_header +
 41                           offsetof(struct ipv6hdr, nexthdr);
 42         skb->transport_header = skb->network_header + sizeof(*top_iph);
 43         top_iph = ipv6_hdr(skb);
 44 
 45         top_iph->version = 6;
 46 
 47         memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
 48                sizeof(top_iph->flow_lbl));
 49         top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
 50 
 51         if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
 52                 dsfield = 0;
 53         else
 54                 dsfield = XFRM_MODE_SKB_CB(skb)->tos;
 55         dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
 56         if (x->props.flags & XFRM_STATE_NOECN)
 57                 dsfield &= ~INET_ECN_MASK;
 58         ipv6_change_dsfield(top_iph, 0, dsfield);
 59         top_iph->hop_limit = ip6_dst_hoplimit(dst->child);
 60         top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
 61         top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
 62         return 0;
 63 }
 64 
 65 #define for_each_input_rcu(head, handler)       \
 66         for (handler = rcu_dereference(head);   \
 67              handler != NULL;                   \
 68              handler = rcu_dereference(handler->next))
 69 
 70 
 71 static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
 72 {
 73         int err = -EINVAL;
 74 
 75         if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
 76                 goto out;
 77         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
 78                 goto out;
 79 
 80         err = skb_unclone(skb, GFP_ATOMIC);
 81         if (err)
 82                 goto out;
 83 
 84         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 85                 ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
 86                                ipipv6_hdr(skb));
 87         if (!(x->props.flags & XFRM_STATE_NOECN))
 88                 ipip6_ecn_decapsulate(skb);
 89 
 90         skb_reset_network_header(skb);
 91         skb_mac_header_rebuild(skb);
 92 
 93         err = 0;
 94 
 95 out:
 96         return err;
 97 }
 98 
 99 static struct xfrm_mode xfrm6_tunnel_mode = {
100         .input2 = xfrm6_mode_tunnel_input,
101         .input = xfrm_prepare_input,
102         .output2 = xfrm6_mode_tunnel_output,
103         .output = xfrm6_prepare_output,
104         .owner = THIS_MODULE,
105         .encap = XFRM_MODE_TUNNEL,
106         .flags = XFRM_MODE_FLAG_TUNNEL,
107 };
108 
109 static int __init xfrm6_mode_tunnel_init(void)
110 {
111         return xfrm_register_mode(&xfrm6_tunnel_mode, AF_INET6);
112 }
113 
114 static void __exit xfrm6_mode_tunnel_exit(void)
115 {
116         int err;
117 
118         err = xfrm_unregister_mode(&xfrm6_tunnel_mode, AF_INET6);
119         BUG_ON(err);
120 }
121 
122 module_init(xfrm6_mode_tunnel_init);
123 module_exit(xfrm6_mode_tunnel_exit);
124 MODULE_LICENSE("GPL");
125 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TUNNEL);
126 

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