xfrm4_state.c

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/*
 * 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>
#include <linux/export.h>

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_selector *sel, const struct flowi *fl)
{
    const struct flowi4 *fl4 = &fl->u.ip4;

    sel->daddr.a4 = fl4->daddr;
    sel->saddr.a4 = fl4->saddr;
    sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
    sel->dport_mask = htons(0xffff);
    sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
    sel->sport_mask = htons(0xffff);
    sel->family = AF_INET;
    sel->prefixlen_d = 32;
    sel->prefixlen_s = 32;
    sel->proto = fl4->flowi4_proto;
    sel->ifindex = fl4->flowi4_oif;
}

static void
xfrm4_init_temprop(struct xfrm_state *x, const struct xfrm_tmpl *tmpl,
           const xfrm_address_t *daddr, const xfrm_address_t *saddr)
{
    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)
{
    const 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,
    .init_temprop       = xfrm4_init_temprop,
    .output         = xfrm4_output,
    .output_finish      = xfrm4_output_finish,
    .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  */