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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         struct xfrm_offload *xo = xfrm_offload(skb);
 50 
 51         if (skb->transport_header != skb->network_header) {
 52                 memmove(skb_transport_header(skb),
 53                         skb_network_header(skb), ihl);
 54                 skb->network_header = skb->transport_header;
 55         }
 56         ip_hdr(skb)->tot_len = htons(skb->len + ihl);
 57         if (!xo || !(xo->flags & XFRM_GRO))
 58                 skb_reset_transport_header(skb);
 59         return 0;
 60 }
 61 
 62 static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
 63                                                    struct sk_buff *skb,
 64                                                    netdev_features_t features)
 65 {
 66         const struct net_offload *ops;
 67         struct sk_buff *segs = ERR_PTR(-EINVAL);
 68         struct xfrm_offload *xo = xfrm_offload(skb);
 69 
 70         skb->transport_header += x->props.header_len;
 71         ops = rcu_dereference(inet_offloads[xo->proto]);
 72         if (likely(ops && ops->callbacks.gso_segment))
 73                 segs = ops->callbacks.gso_segment(skb, features);
 74 
 75         return segs;
 76 }
 77 
 78 static void xfrm4_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)
 79 {
 80         struct xfrm_offload *xo = xfrm_offload(skb);
 81 
 82         skb_reset_mac_len(skb);
 83         pskb_pull(skb, skb->mac_len + sizeof(struct iphdr) + x->props.header_len);
 84 
 85         if (xo->flags & XFRM_GSO_SEGMENT) {
 86                  skb_reset_transport_header(skb);
 87                  skb->transport_header -= x->props.header_len;
 88         }
 89 }
 90 
 91 static struct xfrm_mode xfrm4_transport_mode = {
 92         .input = xfrm4_transport_input,
 93         .output = xfrm4_transport_output,
 94         .gso_segment = xfrm4_transport_gso_segment,
 95         .xmit = xfrm4_transport_xmit,
 96         .owner = THIS_MODULE,
 97         .encap = XFRM_MODE_TRANSPORT,
 98 };
 99 
100 static int __init xfrm4_transport_init(void)
101 {
102         return xfrm_register_mode(&xfrm4_transport_mode, AF_INET);
103 }
104 
105 static void __exit xfrm4_transport_exit(void)
106 {
107         int err;
108 
109         err = xfrm_unregister_mode(&xfrm4_transport_mode, AF_INET);
110         BUG_ON(err);
111 }
112 
113 module_init(xfrm4_transport_init);
114 module_exit(xfrm4_transport_exit);
115 MODULE_LICENSE("GPL");
116 MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TRANSPORT);
117 

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