root/net/ipv4/xfrm4_state.c

DEFINITIONS

1. xfrm4_init_flags
2. __xfrm4_init_tempsel
3. xfrm4_extract_header
4. xfrm4_state_init
5. xfrm4_state_fini

/*
 * xfrm4_state.c
 *
 * Changes:
 *      YOSHIFUJI Hideaki @USAGI
 *              Split up af-specific portion
 *
 */

#include <net/ip.h>
#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/netfilter_ipv4.h>

static struct xfrm_state_afinfo xfrm4_state_afinfo;

static int xfrm4_init_flags(struct xfrm_state *x)
{
        if (ipv4_config.no_pmtu_disc)
                x->props.flags |= XFRM_STATE_NOPMTUDISC;
        return 0;
}

static void
__xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
                     struct xfrm_tmpl *tmpl,
                     xfrm_address_t *daddr, xfrm_address_t *saddr)
{
        x->sel.daddr.a4 = fl->fl4_dst;
        x->sel.saddr.a4 = fl->fl4_src;
        x->sel.dport = xfrm_flowi_dport(fl);
        x->sel.dport_mask = htons(0xffff);
        x->sel.sport = xfrm_flowi_sport(fl);
        x->sel.sport_mask = htons(0xffff);
        x->sel.prefixlen_d = 32;
        x->sel.prefixlen_s = 32;
        x->sel.proto = fl->proto;
        x->sel.ifindex = fl->oif;
        x->id = tmpl->id;
        if (x->id.daddr.a4 == 0)
                x->id.daddr.a4 = daddr->a4;
        x->props.saddr = tmpl->saddr;
        if (x->props.saddr.a4 == 0)
                x->props.saddr.a4 = saddr->a4;
        x->props.mode = tmpl->mode;
        x->props.reqid = tmpl->reqid;
        x->props.family = AF_INET;
}

int xfrm4_extract_header(struct sk_buff *skb)
{
        struct iphdr *iph = ip_hdr(skb);

        XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph);
        XFRM_MODE_SKB_CB(skb)->id = iph->id;
        XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
        XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
        XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
        XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph);
        memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
               sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));

        return 0;
}

static struct xfrm_state_afinfo xfrm4_state_afinfo = {
        .family                 = AF_INET,
        .proto                  = IPPROTO_IPIP,
        .eth_proto              = htons(ETH_P_IP),
        .owner                  = THIS_MODULE,
        .init_flags             = xfrm4_init_flags,
        .init_tempsel           = __xfrm4_init_tempsel,
        .output                 = xfrm4_output,
        .extract_input          = xfrm4_extract_input,
        .extract_output         = xfrm4_extract_output,
        .transport_finish       = xfrm4_transport_finish,
};

void __init xfrm4_state_init(void)
{
        xfrm_state_register_afinfo(&xfrm4_state_afinfo);
}

#if 0
void __exit xfrm4_state_fini(void)
{
        xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
}
#endif  /*  0  */