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Linux/net/ipv4/xfrm4_mode_transport.c

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  1 /*
  2  * xfrm4_mode_transport.c - Transport mode encapsulation for IPv4.
  3  *
  4  * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
  5  */
  6 
  7 #include <linux/init.h>
  8 #include <linux/kernel.h>
  9 #include <linux/module.h>
 10 #include <linux/skbuff.h>
 11 #include <linux/stringify.h>
 12 #include <net/dst.h>
 13 #include <net/ip.h>
 14 #include <net/xfrm.h>
 15 #include <net/protocol.h>
 16 
 17 /* Add encapsulation header.
 18  *
 19  * The IP header will be moved forward to make space for the encapsulation
 20  * header.
 21  */
 22 static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb)
 23 {
 24         struct iphdr *iph = ip_hdr(skb);
 25         int ihl = iph->ihl * 4;
 26 
 27         skb_set_inner_transport_header(skb, skb_transport_offset(skb));
 28 
 29         skb_set_network_header(skb, -x->props.header_len);
 30         skb->mac_header = skb->network_header +
 31                           offsetof(struct iphdr, protocol);
 32         skb->transport_header = skb->network_header + ihl;
 33         __skb_pull(skb, ihl);
 34         memmove(skb_network_header(skb), iph, ihl);
 35         return 0;
 36 }
 37 
 38 /* Remove encapsulation header.
 39  *
 40  * The IP header will be moved over the top of the encapsulation header.
 41  *
 42  * On entry, skb->h shall point to where the IP header should be and skb->nh
 43  * shall be set to where the IP header currently is.  skb->data shall point
 44  * to the start of the payload.
 45  */
 46 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
 47 {
 48         int ihl = skb->data - skb_transport_header(skb);
 49 
 50         if (skb->transport_header != skb->network_header) {
 51                 memmove(skb_transport_header(skb),
 52                         skb_network_header(skb), ihl);
 53                 skb->network_header = skb->transport_header;
 54         }
 55         ip_hdr(skb)->tot_len = htons(skb->len + ihl);
 56         skb_reset_transport_header(skb);
 57         return 0;
 58 }
 59 
 60 static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
 61                                                    struct sk_buff *skb,
 62                                                    netdev_features_t features)
 63 {
 64         const struct net_offload *ops;
 65         struct sk_buff *segs = ERR_PTR(-EINVAL);
 66         struct xfrm_offload *xo = xfrm_offload(skb);
 67 
 68         skb->transport_header += x->props.header_len;
 69         ops = rcu_dereference(inet_offloads[xo->proto]);
 70         if (likely(ops && ops->callbacks.gso_segment))
 71                 segs = ops->callbacks.gso_segment(skb, features);
 72 
 73         return segs;
 74 }
 75 
 76 static void xfrm4_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)
 77 {
 78         struct xfrm_offload *xo = xfrm_offload(skb);
 79 
 80         skb_reset_mac_len(skb);
 81         pskb_pull(skb, skb->mac_len + sizeof(struct iphdr) + x->props.header_len);
 82 
 83         if (xo->flags & XFRM_GSO_SEGMENT) {
 84                  skb_reset_transport_header(skb);
 85                  skb->transport_header -= x->props.header_len;
 86         }
 87 }
 88 
 89 static struct xfrm_mode xfrm4_transport_mode = {
 90         .input = xfrm4_transport_input,
 91         .output = xfrm4_transport_output,
 92         .gso_segment = xfrm4_transport_gso_segment,
 93         .xmit = xfrm4_transport_xmit,
 94         .owner = THIS_MODULE,
 95         .encap = XFRM_MODE_TRANSPORT,
 96 };
 97 
 98 static int __init xfrm4_transport_init(void)
 99 {
100         return xfrm_register_mode(&xfrm4_transport_mode, AF_INET);
101 }
102 
103 static void __exit xfrm4_transport_exit(void)
104 {
105         int err;
106 
107         err = xfrm_unregister_mode(&xfrm4_transport_mode, AF_INET);
108         BUG_ON(err);
109 }
110 
111 module_init(xfrm4_transport_init);
112 module_exit(xfrm4_transport_exit);
113 MODULE_LICENSE("GPL");
114 MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TRANSPORT);
115 

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