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Linux/net/ipv6/xfrm6_mode_transport.c

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  1 /*
  2  * xfrm6_mode_transport.c - Transport 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/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/ipv6.h>
 15 #include <net/xfrm.h>
 16 #include <net/protocol.h>
 17 
 18 /* Add encapsulation header.
 19  *
 20  * The IP header and mutable extension headers will be moved forward to make
 21  * space for the encapsulation header.
 22  */
 23 static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
 24 {
 25         struct ipv6hdr *iph;
 26         u8 *prevhdr;
 27         int hdr_len;
 28 
 29         iph = ipv6_hdr(skb);
 30         skb_set_inner_transport_header(skb, skb_transport_offset(skb));
 31 
 32         hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
 33         if (hdr_len < 0)
 34                 return hdr_len;
 35         skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
 36         skb_set_network_header(skb, -x->props.header_len);
 37         skb->transport_header = skb->network_header + hdr_len;
 38         __skb_pull(skb, hdr_len);
 39         memmove(ipv6_hdr(skb), iph, hdr_len);
 40         return 0;
 41 }
 42 
 43 /* Remove encapsulation header.
 44  *
 45  * The IP header will be moved over the top of the encapsulation header.
 46  *
 47  * On entry, skb->h shall point to where the IP header should be and skb->nh
 48  * shall be set to where the IP header currently is.  skb->data shall point
 49  * to the start of the payload.
 50  */
 51 static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
 52 {
 53         int ihl = skb->data - skb_transport_header(skb);
 54         struct xfrm_offload *xo = xfrm_offload(skb);
 55 
 56         if (skb->transport_header != skb->network_header) {
 57                 memmove(skb_transport_header(skb),
 58                         skb_network_header(skb), ihl);
 59                 skb->network_header = skb->transport_header;
 60         }
 61         ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
 62                                            sizeof(struct ipv6hdr));
 63         if (!xo || !(xo->flags & XFRM_GRO))
 64                 skb_reset_transport_header(skb);
 65         return 0;
 66 }
 67 
 68 static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x,
 69                                                    struct sk_buff *skb,
 70                                                    netdev_features_t features)
 71 {
 72         const struct net_offload *ops;
 73         struct sk_buff *segs = ERR_PTR(-EINVAL);
 74         struct xfrm_offload *xo = xfrm_offload(skb);
 75 
 76         skb->transport_header += x->props.header_len;
 77         ops = rcu_dereference(inet6_offloads[xo->proto]);
 78         if (likely(ops && ops->callbacks.gso_segment))
 79                 segs = ops->callbacks.gso_segment(skb, features);
 80 
 81         return segs;
 82 }
 83 
 84 static void xfrm6_transport_xmit(struct xfrm_state *x, struct sk_buff *skb)
 85 {
 86         struct xfrm_offload *xo = xfrm_offload(skb);
 87 
 88         skb_reset_mac_len(skb);
 89         pskb_pull(skb, skb->mac_len + sizeof(struct ipv6hdr) + x->props.header_len);
 90 
 91         if (xo->flags & XFRM_GSO_SEGMENT) {
 92                  skb_reset_transport_header(skb);
 93                  skb->transport_header -= x->props.header_len;
 94         }
 95 }
 96 
 97 
 98 static struct xfrm_mode xfrm6_transport_mode = {
 99         .input = xfrm6_transport_input,
100         .output = xfrm6_transport_output,
101         .gso_segment = xfrm4_transport_gso_segment,
102         .xmit = xfrm6_transport_xmit,
103         .owner = THIS_MODULE,
104         .encap = XFRM_MODE_TRANSPORT,
105 };
106 
107 static int __init xfrm6_transport_init(void)
108 {
109         return xfrm_register_mode(&xfrm6_transport_mode, AF_INET6);
110 }
111 
112 static void __exit xfrm6_transport_exit(void)
113 {
114         int err;
115 
116         err = xfrm_unregister_mode(&xfrm6_transport_mode, AF_INET6);
117         BUG_ON(err);
118 }
119 
120 module_init(xfrm6_transport_init);
121 module_exit(xfrm6_transport_exit);
122 MODULE_LICENSE("GPL");
123 MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TRANSPORT);
124 

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