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Linux/net/ipv4/xfrm4_state.c

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  1 /*
  2  * xfrm4_state.c
  3  *
  4  * Changes:
  5  *      YOSHIFUJI Hideaki @USAGI
  6  *              Split up af-specific portion
  7  *
  8  */
  9 
 10 #include <net/ip.h>
 11 #include <net/xfrm.h>
 12 #include <linux/pfkeyv2.h>
 13 #include <linux/ipsec.h>
 14 #include <linux/netfilter_ipv4.h>
 15 #include <linux/export.h>
 16 
 17 static int xfrm4_init_flags(struct xfrm_state *x)
 18 {
 19         if (xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
 20                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
 21         return 0;
 22 }
 23 
 24 static void
 25 __xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
 26 {
 27         const struct flowi4 *fl4 = &fl->u.ip4;
 28 
 29         sel->daddr.a4 = fl4->daddr;
 30         sel->saddr.a4 = fl4->saddr;
 31         sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
 32         sel->dport_mask = htons(0xffff);
 33         sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
 34         sel->sport_mask = htons(0xffff);
 35         sel->family = AF_INET;
 36         sel->prefixlen_d = 32;
 37         sel->prefixlen_s = 32;
 38         sel->proto = fl4->flowi4_proto;
 39         sel->ifindex = fl4->flowi4_oif;
 40 }
 41 
 42 static void
 43 xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
 44                    const xfrm_address_t *daddr, const xfrm_address_t *saddr)
 45 {
 46         x->id = tmpl->id;
 47         if (x->id.daddr.a4 == 0)
 48                 x->id.daddr.a4 = daddr->a4;
 49         x->props.saddr = tmpl->saddr;
 50         if (x->props.saddr.a4 == 0)
 51                 x->props.saddr.a4 = saddr->a4;
 52         x->props.mode = tmpl->mode;
 53         x->props.reqid = tmpl->reqid;
 54         x->props.family = AF_INET;
 55 }
 56 
 57 int xfrm4_extract_header(struct sk_buff *skb)
 58 {
 59         const struct iphdr *iph = ip_hdr(skb);
 60 
 61         XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
 62         XFRM_MODE_SKB_CB(skb)->id = iph->id;
 63         XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
 64         XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
 65         XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
 66         XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
 67         memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
 68                sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
 69 
 70         return 0;
 71 }
 72 
 73 static struct xfrm_state_afinfo xfrm4_state_afinfo = {
 74         .family                 = AF_INET,
 75         .proto                  = IPPROTO_IPIP,
 76         .eth_proto              = htons(ETH_P_IP),
 77         .owner                  = THIS_MODULE,
 78         .init_flags             = xfrm4_init_flags,
 79         .init_tempsel           = __xfrm4_init_tempsel,
 80         .init_temprop           = xfrm4_init_temprop,
 81         .output                 = xfrm4_output,
 82         .output_finish          = xfrm4_output_finish,
 83         .extract_input          = xfrm4_extract_input,
 84         .extract_output         = xfrm4_extract_output,
 85         .transport_finish       = xfrm4_transport_finish,
 86         .local_error            = xfrm4_local_error,
 87 };
 88 
 89 void __init xfrm4_state_init(void)
 90 {
 91         xfrm_state_register_afinfo(&xfrm4_state_afinfo);
 92 }
 93 
 94 #if 0
 95 void __exit xfrm4_state_fini(void)
 96 {
 97         xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
 98 }
 99 #endif  /*  0  */
100 
101 

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