This patch changes xfrm6_tunnel register and deregister interface to prepare for solving the conflict of device tunnels with inter address family IPsec tunnel. There is no device which conflicts with IPv4 over IPv6 IPsec tunnel. Signed-off-by: Kazunori MIYAZAWA <miyazawa@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
249 lines
4.7 KiB
C
249 lines
4.7 KiB
C
/*
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* xfrm6_input.c: based on net/ipv4/xfrm4_input.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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* YOSHIFUJI Hideaki @USAGI
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* IPv6 support
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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int xfrm6_rcv_spi(struct sk_buff *skb, __be32 spi)
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{
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int err;
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__be32 seq;
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struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH];
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struct xfrm_state *x;
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int xfrm_nr = 0;
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int decaps = 0;
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int nexthdr;
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unsigned int nhoff;
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nhoff = IP6CB(skb)->nhoff;
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nexthdr = skb->nh.raw[nhoff];
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seq = 0;
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if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
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goto drop;
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do {
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struct ipv6hdr *iph = skb->nh.ipv6h;
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if (xfrm_nr == XFRM_MAX_DEPTH)
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goto drop;
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x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi,
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nexthdr != IPPROTO_IPIP ? nexthdr : IPPROTO_IPV6, AF_INET6);
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if (x == NULL)
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goto drop;
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spin_lock(&x->lock);
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if (unlikely(x->km.state != XFRM_STATE_VALID))
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goto drop_unlock;
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if (x->props.replay_window && xfrm_replay_check(x, seq))
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goto drop_unlock;
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if (xfrm_state_check_expire(x))
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goto drop_unlock;
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nexthdr = x->type->input(x, skb);
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if (nexthdr <= 0)
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goto drop_unlock;
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skb->nh.raw[nhoff] = nexthdr;
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if (x->props.replay_window)
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xfrm_replay_advance(x, seq);
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x->curlft.bytes += skb->len;
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x->curlft.packets++;
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spin_unlock(&x->lock);
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xfrm_vec[xfrm_nr++] = x;
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if (x->mode->input(x, skb))
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goto drop;
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if (x->props.mode == XFRM_MODE_TUNNEL) { /* XXX */
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decaps = 1;
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break;
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}
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if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) < 0)
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goto drop;
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} while (!err);
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/* Allocate new secpath or COW existing one. */
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if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
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struct sec_path *sp;
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sp = secpath_dup(skb->sp);
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if (!sp)
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goto drop;
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if (skb->sp)
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secpath_put(skb->sp);
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skb->sp = sp;
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}
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if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
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goto drop;
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memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec,
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xfrm_nr * sizeof(xfrm_vec[0]));
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skb->sp->len += xfrm_nr;
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skb->ip_summed = CHECKSUM_NONE;
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nf_reset(skb);
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if (decaps) {
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if (!(skb->dev->flags&IFF_LOOPBACK)) {
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dst_release(skb->dst);
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skb->dst = NULL;
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}
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netif_rx(skb);
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return -1;
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} else {
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#ifdef CONFIG_NETFILTER
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skb->nh.ipv6h->payload_len = htons(skb->len);
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__skb_push(skb, skb->data - skb->nh.raw);
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NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
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ip6_rcv_finish);
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return -1;
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#else
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return 1;
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#endif
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}
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drop_unlock:
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spin_unlock(&x->lock);
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xfrm_state_put(x);
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drop:
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while (--xfrm_nr >= 0)
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xfrm_state_put(xfrm_vec[xfrm_nr]);
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kfree_skb(skb);
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return -1;
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}
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EXPORT_SYMBOL(xfrm6_rcv_spi);
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int xfrm6_rcv(struct sk_buff **pskb)
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{
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return xfrm6_rcv_spi(*pskb, 0);
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}
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int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
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xfrm_address_t *saddr, u8 proto)
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{
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struct xfrm_state *x = NULL;
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int wildcard = 0;
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struct in6_addr any;
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xfrm_address_t *xany;
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struct xfrm_state *xfrm_vec_one = NULL;
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int nh = 0;
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int i = 0;
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ipv6_addr_set(&any, 0, 0, 0, 0);
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xany = (xfrm_address_t *)&any;
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for (i = 0; i < 3; i++) {
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xfrm_address_t *dst, *src;
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switch (i) {
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case 0:
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dst = daddr;
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src = saddr;
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break;
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case 1:
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/* lookup state with wild-card source address */
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wildcard = 1;
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dst = daddr;
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src = xany;
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break;
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case 2:
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default:
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/* lookup state with wild-card addresses */
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wildcard = 1; /* XXX */
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dst = xany;
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src = xany;
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break;
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}
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x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
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if (!x)
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continue;
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spin_lock(&x->lock);
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if (wildcard) {
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if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
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spin_unlock(&x->lock);
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xfrm_state_put(x);
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x = NULL;
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continue;
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}
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}
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if (unlikely(x->km.state != XFRM_STATE_VALID)) {
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spin_unlock(&x->lock);
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xfrm_state_put(x);
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x = NULL;
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continue;
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}
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if (xfrm_state_check_expire(x)) {
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spin_unlock(&x->lock);
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xfrm_state_put(x);
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x = NULL;
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continue;
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}
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nh = x->type->input(x, skb);
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if (nh <= 0) {
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spin_unlock(&x->lock);
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xfrm_state_put(x);
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x = NULL;
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continue;
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}
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x->curlft.bytes += skb->len;
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x->curlft.packets++;
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spin_unlock(&x->lock);
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xfrm_vec_one = x;
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break;
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}
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if (!xfrm_vec_one)
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goto drop;
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/* Allocate new secpath or COW existing one. */
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if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
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struct sec_path *sp;
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sp = secpath_dup(skb->sp);
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if (!sp)
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goto drop;
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if (skb->sp)
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secpath_put(skb->sp);
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skb->sp = sp;
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}
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if (1 + skb->sp->len > XFRM_MAX_DEPTH)
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goto drop;
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skb->sp->xvec[skb->sp->len] = xfrm_vec_one;
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skb->sp->len ++;
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return 1;
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drop:
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if (xfrm_vec_one)
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xfrm_state_put(xfrm_vec_one);
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return -1;
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}
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