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Linux/net/ipv4/xfrm4_mode_tunnel.c

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  1 /*
  2  * xfrm4_mode_tunnel.c - Tunnel mode encapsulation for IPv4.
  3  *
  4  * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
  5  */
  6 
  7 #include <linux/gfp.h>
  8 #include <linux/init.h>
  9 #include <linux/kernel.h>
 10 #include <linux/module.h>
 11 #include <linux/skbuff.h>
 12 #include <linux/stringify.h>
 13 #include <net/dst.h>
 14 #include <net/inet_ecn.h>
 15 #include <net/ip.h>
 16 #include <net/xfrm.h>
 17 
 18 static inline void ipip_ecn_decapsulate(struct sk_buff *skb)
 19 {
 20         struct iphdr *inner_iph = ipip_hdr(skb);
 21 
 22         if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
 23                 IP_ECN_set_ce(inner_iph);
 24 }
 25 
 26 /* Add encapsulation header.
 27  *
 28  * The top IP header will be constructed per RFC 2401.
 29  */
 30 static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
 31 {
 32         struct dst_entry *dst = skb_dst(skb);
 33         struct iphdr *top_iph;
 34         int flags;
 35 
 36         skb_set_inner_network_header(skb, skb_network_offset(skb));
 37         skb_set_inner_transport_header(skb, skb_transport_offset(skb));
 38 
 39         skb_set_network_header(skb, -x->props.header_len);
 40         skb->mac_header = skb->network_header +
 41                           offsetof(struct iphdr, protocol);
 42         skb->transport_header = skb->network_header + sizeof(*top_iph);
 43         top_iph = ip_hdr(skb);
 44 
 45         top_iph->ihl = 5;
 46         top_iph->version = 4;
 47 
 48         top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family);
 49 
 50         /* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */
 51         if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP)
 52                 top_iph->tos = 0;
 53         else
 54                 top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
 55         top_iph->tos = INET_ECN_encapsulate(top_iph->tos,
 56                                             XFRM_MODE_SKB_CB(skb)->tos);
 57 
 58         flags = x->props.flags;
 59         if (flags & XFRM_STATE_NOECN)
 60                 IP_ECN_clear(top_iph);
 61 
 62         top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
 63                 0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF));
 64 
 65         top_iph->ttl = ip4_dst_hoplimit(dst->child);
 66 
 67         top_iph->saddr = x->props.saddr.a4;
 68         top_iph->daddr = x->id.daddr.a4;
 69         ip_select_ident(dev_net(dst->dev), skb, NULL);
 70 
 71         return 0;
 72 }
 73 
 74 static int xfrm4_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_IPIP)
 79                 goto out;
 80 
 81         if (!pskb_may_pull(skb, sizeof(struct iphdr)))
 82                 goto out;
 83 
 84         err = skb_unclone(skb, GFP_ATOMIC);
 85         if (err)
 86                 goto out;
 87 
 88         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 89                 ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
 90         if (!(x->props.flags & XFRM_STATE_NOECN))
 91                 ipip_ecn_decapsulate(skb);
 92 
 93         skb_reset_network_header(skb);
 94         skb_mac_header_rebuild(skb);
 95         eth_hdr(skb)->h_proto = skb->protocol;
 96 
 97         err = 0;
 98 
 99 out:
100         return err;
101 }
102 
103 static struct sk_buff *xfrm4_mode_tunnel_gso_segment(struct xfrm_state *x,
104                                                      struct sk_buff *skb,
105                                                      netdev_features_t features)
106 {
107         __skb_push(skb, skb->mac_len);
108         return skb_mac_gso_segment(skb, features);
109 
110 }
111 
112 static void xfrm4_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->network_header = skb->network_header - x->props.header_len;
118                 skb->transport_header = skb->network_header +
119                                         sizeof(struct iphdr);
120         }
121 
122         skb_reset_mac_len(skb);
123         pskb_pull(skb, skb->mac_len + x->props.header_len);
124 }
125 
126 static struct xfrm_mode xfrm4_tunnel_mode = {
127         .input2 = xfrm4_mode_tunnel_input,
128         .input = xfrm_prepare_input,
129         .output2 = xfrm4_mode_tunnel_output,
130         .output = xfrm4_prepare_output,
131         .gso_segment = xfrm4_mode_tunnel_gso_segment,
132         .xmit = xfrm4_mode_tunnel_xmit,
133         .owner = THIS_MODULE,
134         .encap = XFRM_MODE_TUNNEL,
135         .flags = XFRM_MODE_FLAG_TUNNEL,
136 };
137 
138 static int __init xfrm4_mode_tunnel_init(void)
139 {
140         return xfrm_register_mode(&xfrm4_tunnel_mode, AF_INET);
141 }
142 
143 static void __exit xfrm4_mode_tunnel_exit(void)
144 {
145         int err;
146 
147         err = xfrm_unregister_mode(&xfrm4_tunnel_mode, AF_INET);
148         BUG_ON(err);
149 }
150 
151 module_init(xfrm4_mode_tunnel_init);
152 module_exit(xfrm4_mode_tunnel_exit);
153 MODULE_LICENSE("GPL");
154 MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TUNNEL);
155 

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