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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_inner_network_header(skb, skb_network_offset(skb));
 40         skb_set_inner_transport_header(skb, skb_transport_offset(skb));
 41 
 42         skb_set_network_header(skb, -x->props.header_len);
 43         skb->mac_header = skb->network_header +
 44                           offsetof(struct ipv6hdr, nexthdr);
 45         skb->transport_header = skb->network_header + sizeof(*top_iph);
 46         top_iph = ipv6_hdr(skb);
 47 
 48         top_iph->version = 6;
 49 
 50         memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
 51                sizeof(top_iph->flow_lbl));
 52         top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family);
 53 
 54         if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
 55                 dsfield = 0;
 56         else
 57                 dsfield = XFRM_MODE_SKB_CB(skb)->tos;
 58         dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos);
 59         if (x->props.flags & XFRM_STATE_NOECN)
 60                 dsfield &= ~INET_ECN_MASK;
 61         ipv6_change_dsfield(top_iph, 0, dsfield);
 62         top_iph->hop_limit = ip6_dst_hoplimit(xfrm_dst_child(dst));
 63         top_iph->saddr = *(struct in6_addr *)&x->props.saddr;
 64         top_iph->daddr = *(struct in6_addr *)&x->id.daddr;
 65         return 0;
 66 }
 67 
 68 #define for_each_input_rcu(head, handler)       \
 69         for (handler = rcu_dereference(head);   \
 70              handler != NULL;                   \
 71              handler = rcu_dereference(handler->next))
 72 
 73 
 74 static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
 75 {
 76         int err = -EINVAL;
 77 
 78         if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
 79                 goto out;
 80         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
 81                 goto out;
 82 
 83         err = skb_unclone(skb, GFP_ATOMIC);
 84         if (err)
 85                 goto out;
 86 
 87         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 88                 ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
 89                                ipipv6_hdr(skb));
 90         if (!(x->props.flags & XFRM_STATE_NOECN))
 91                 ipip6_ecn_decapsulate(skb);
 92 
 93         skb_reset_network_header(skb);
 94         skb_mac_header_rebuild(skb);
 95         if (skb->mac_len)
 96                 eth_hdr(skb)->h_proto = skb->protocol;
 97 
 98         err = 0;
 99 
100 out:
101         return err;
102 }
103 
104 static struct sk_buff *xfrm6_mode_tunnel_gso_segment(struct xfrm_state *x,
105                                                      struct sk_buff *skb,
106                                                      netdev_features_t features)
107 {
108         __skb_push(skb, skb->mac_len);
109         return skb_mac_gso_segment(skb, features);
110 }
111 
112 static void xfrm6_mode_tunnel_xmit(struct xfrm_state *x, struct sk_buff *skb)
113 {
114         struct xfrm_offload *xo = xfrm_offload(skb);
115 
116         if (xo->flags & XFRM_GSO_SEGMENT)
117                 skb->transport_header = skb->network_header + sizeof(struct ipv6hdr);
118 
119         skb_reset_mac_len(skb);
120         pskb_pull(skb, skb->mac_len + x->props.header_len);
121 }
122 
123 static struct xfrm_mode xfrm6_tunnel_mode = {
124         .input2 = xfrm6_mode_tunnel_input,
125         .input = xfrm_prepare_input,
126         .output2 = xfrm6_mode_tunnel_output,
127         .output = xfrm6_prepare_output,
128         .gso_segment = xfrm6_mode_tunnel_gso_segment,
129         .xmit = xfrm6_mode_tunnel_xmit,
130         .owner = THIS_MODULE,
131         .encap = XFRM_MODE_TUNNEL,
132         .flags = XFRM_MODE_FLAG_TUNNEL,
133 };
134 
135 static int __init xfrm6_mode_tunnel_init(void)
136 {
137         return xfrm_register_mode(&xfrm6_tunnel_mode, AF_INET6);
138 }
139 
140 static void __exit xfrm6_mode_tunnel_exit(void)
141 {
142         int err;
143 
144         err = xfrm_unregister_mode(&xfrm6_tunnel_mode, AF_INET6);
145         BUG_ON(err);
146 }
147 
148 module_init(xfrm6_mode_tunnel_init);
149 module_exit(xfrm6_mode_tunnel_exit);
150 MODULE_LICENSE("GPL");
151 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TUNNEL);
152 

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