154 lines
4.3 KiB
C
154 lines
4.3 KiB
C
/*
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* xfrm6_state.c: based on xfrm4_state.c
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*
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* Authors:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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* YOSHIFUJI Hideaki @USAGI
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* Split up af-specific portion
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*
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*/
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#include <net/xfrm.h>
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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static struct xfrm_state_afinfo xfrm6_state_afinfo;
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static void
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__xfrm6_init_tempsel(struct xfrm_state *x, struct flowi *fl,
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struct xfrm_tmpl *tmpl,
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xfrm_address_t *daddr, xfrm_address_t *saddr)
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{
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/* Initialize temporary selector matching only
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* to current session. */
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ipv6_addr_copy((struct in6_addr *)&x->sel.daddr, &fl->fl6_dst);
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ipv6_addr_copy((struct in6_addr *)&x->sel.saddr, &fl->fl6_src);
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x->sel.dport = xfrm_flowi_dport(fl);
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x->sel.dport_mask = ~0;
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x->sel.sport = xfrm_flowi_sport(fl);
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x->sel.sport_mask = ~0;
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x->sel.prefixlen_d = 128;
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x->sel.prefixlen_s = 128;
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x->sel.proto = fl->proto;
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x->sel.ifindex = fl->oif;
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x->id = tmpl->id;
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if (ipv6_addr_any((struct in6_addr*)&x->id.daddr))
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memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
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memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
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if (ipv6_addr_any((struct in6_addr*)&x->props.saddr))
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memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
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if (tmpl->mode && ipv6_addr_any((struct in6_addr*)&x->props.saddr)) {
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struct rt6_info *rt;
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struct flowi fl_tunnel = {
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.nl_u = {
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.ip6_u = {
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.daddr = *(struct in6_addr *)daddr,
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}
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}
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};
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if (!xfrm_dst_lookup((struct xfrm_dst **)&rt,
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&fl_tunnel, AF_INET6)) {
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ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)daddr,
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(struct in6_addr *)&x->props.saddr);
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dst_release(&rt->u.dst);
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}
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}
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x->props.mode = tmpl->mode;
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x->props.reqid = tmpl->reqid;
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x->props.family = AF_INET6;
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}
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static struct xfrm_state *
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__xfrm6_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto)
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{
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unsigned h = __xfrm6_spi_hash(daddr, spi, proto);
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struct xfrm_state *x;
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list_for_each_entry(x, xfrm6_state_afinfo.state_byspi+h, byspi) {
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if (x->props.family == AF_INET6 &&
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spi == x->id.spi &&
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ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
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proto == x->id.proto) {
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xfrm_state_hold(x);
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return x;
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}
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}
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return NULL;
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}
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static struct xfrm_state *
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__xfrm6_find_acq(u8 mode, u32 reqid, u8 proto,
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xfrm_address_t *daddr, xfrm_address_t *saddr,
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int create)
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{
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struct xfrm_state *x, *x0;
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unsigned h = __xfrm6_dst_hash(daddr);
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x0 = NULL;
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list_for_each_entry(x, xfrm6_state_afinfo.state_bydst+h, bydst) {
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if (x->props.family == AF_INET6 &&
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ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)x->id.daddr.a6) &&
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mode == x->props.mode &&
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proto == x->id.proto &&
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ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)x->props.saddr.a6) &&
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reqid == x->props.reqid &&
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x->km.state == XFRM_STATE_ACQ &&
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!x->id.spi) {
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x0 = x;
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break;
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}
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}
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if (!x0 && create && (x0 = xfrm_state_alloc()) != NULL) {
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ipv6_addr_copy((struct in6_addr *)x0->sel.daddr.a6,
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(struct in6_addr *)daddr);
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ipv6_addr_copy((struct in6_addr *)x0->sel.saddr.a6,
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(struct in6_addr *)saddr);
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x0->sel.prefixlen_d = 128;
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x0->sel.prefixlen_s = 128;
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ipv6_addr_copy((struct in6_addr *)x0->props.saddr.a6,
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(struct in6_addr *)saddr);
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x0->km.state = XFRM_STATE_ACQ;
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ipv6_addr_copy((struct in6_addr *)x0->id.daddr.a6,
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(struct in6_addr *)daddr);
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x0->id.proto = proto;
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x0->props.family = AF_INET6;
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x0->props.mode = mode;
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x0->props.reqid = reqid;
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x0->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
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xfrm_state_hold(x0);
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x0->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
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add_timer(&x0->timer);
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xfrm_state_hold(x0);
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list_add_tail(&x0->bydst, xfrm6_state_afinfo.state_bydst+h);
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wake_up(&km_waitq);
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}
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if (x0)
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xfrm_state_hold(x0);
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return x0;
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}
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static struct xfrm_state_afinfo xfrm6_state_afinfo = {
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.family = AF_INET6,
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.lock = RW_LOCK_UNLOCKED,
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.init_tempsel = __xfrm6_init_tempsel,
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.state_lookup = __xfrm6_state_lookup,
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.find_acq = __xfrm6_find_acq,
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};
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void __init xfrm6_state_init(void)
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{
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xfrm_state_register_afinfo(&xfrm6_state_afinfo);
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}
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void xfrm6_state_fini(void)
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{
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xfrm_state_unregister_afinfo(&xfrm6_state_afinfo);
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}
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