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862b82c6f9
As part of the work on asynchrnous cryptographic operations, we need to be able to resume from the spot where they occur. As such, it helps if we isolate them to one spot. This patch moves most of the remaining family-specific processing into the common output code. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
293 lines
6.8 KiB
C
293 lines
6.8 KiB
C
/*
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* xfrm6_policy.c: based on xfrm4_policy.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
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* Split up af-specific portion
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*
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*/
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <net/addrconf.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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#include <net/mip6.h>
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#endif
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static struct dst_ops xfrm6_dst_ops;
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
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static struct dst_entry *xfrm6_dst_lookup(int tos, xfrm_address_t *saddr,
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xfrm_address_t *daddr)
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{
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struct flowi fl = {};
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struct dst_entry *dst;
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int err;
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memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
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if (saddr)
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memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
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dst = ip6_route_output(NULL, &fl);
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err = dst->error;
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if (dst->error) {
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dst_release(dst);
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dst = ERR_PTR(err);
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}
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return dst;
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}
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static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
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{
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struct dst_entry *dst;
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dst = xfrm6_dst_lookup(0, NULL, daddr);
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if (IS_ERR(dst))
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return -EHOSTUNREACH;
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ipv6_get_saddr(dst, (struct in6_addr *)&daddr->a6,
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(struct in6_addr *)&saddr->a6);
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dst_release(dst);
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return 0;
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}
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static struct dst_entry *
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__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
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{
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struct dst_entry *dst;
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/* Still not clear if we should set fl->fl6_{src,dst}... */
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read_lock_bh(&policy->lock);
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for (dst = policy->bundles; dst; dst = dst->next) {
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struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
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struct in6_addr fl_dst_prefix, fl_src_prefix;
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ipv6_addr_prefix(&fl_dst_prefix,
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&fl->fl6_dst,
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xdst->u.rt6.rt6i_dst.plen);
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ipv6_addr_prefix(&fl_src_prefix,
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&fl->fl6_src,
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xdst->u.rt6.rt6i_src.plen);
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if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
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ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
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xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
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(xdst->u.rt6.rt6i_dst.plen != 128 ||
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xdst->u.rt6.rt6i_src.plen != 128))) {
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dst_clone(dst);
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break;
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}
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}
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read_unlock_bh(&policy->lock);
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return dst;
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}
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static int xfrm6_get_tos(struct flowi *fl)
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{
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return 0;
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}
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static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
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{
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struct rt6_info *rt = (struct rt6_info*)xdst->route;
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xdst->u.dst.dev = dev;
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dev_hold(dev);
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xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
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if (!xdst->u.rt6.rt6i_idev)
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return -ENODEV;
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/* Sheit... I remember I did this right. Apparently,
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* it was magically lost, so this code needs audit */
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xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
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RTF_LOCAL);
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xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
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xdst->u.rt6.rt6i_node = rt->rt6i_node;
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xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
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xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
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xdst->u.rt6.rt6i_src = rt->rt6i_src;
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return 0;
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}
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static inline void
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_decode_session6(struct sk_buff *skb, struct flowi *fl)
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{
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u16 offset = skb_network_header_len(skb);
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struct ipv6hdr *hdr = ipv6_hdr(skb);
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struct ipv6_opt_hdr *exthdr;
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const unsigned char *nh = skb_network_header(skb);
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u8 nexthdr = nh[IP6CB(skb)->nhoff];
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memset(fl, 0, sizeof(struct flowi));
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ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
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ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
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while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
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nh = skb_network_header(skb);
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exthdr = (struct ipv6_opt_hdr *)(nh + offset);
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switch (nexthdr) {
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case NEXTHDR_ROUTING:
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case NEXTHDR_HOP:
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case NEXTHDR_DEST:
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offset += ipv6_optlen(exthdr);
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nexthdr = exthdr->nexthdr;
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exthdr = (struct ipv6_opt_hdr *)(nh + offset);
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break;
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case IPPROTO_UDP:
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case IPPROTO_UDPLITE:
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case IPPROTO_TCP:
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case IPPROTO_SCTP:
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case IPPROTO_DCCP:
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if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
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__be16 *ports = (__be16 *)exthdr;
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fl->fl_ip_sport = ports[0];
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fl->fl_ip_dport = ports[1];
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}
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fl->proto = nexthdr;
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return;
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case IPPROTO_ICMPV6:
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if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
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u8 *icmp = (u8 *)exthdr;
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fl->fl_icmp_type = icmp[0];
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fl->fl_icmp_code = icmp[1];
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}
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fl->proto = nexthdr;
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return;
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#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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case IPPROTO_MH:
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if (pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
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struct ip6_mh *mh;
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mh = (struct ip6_mh *)exthdr;
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fl->fl_mh_type = mh->ip6mh_type;
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}
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fl->proto = nexthdr;
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return;
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#endif
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/* XXX Why are there these headers? */
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case IPPROTO_AH:
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case IPPROTO_ESP:
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case IPPROTO_COMP:
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default:
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fl->fl_ipsec_spi = 0;
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fl->proto = nexthdr;
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return;
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}
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}
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}
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static inline int xfrm6_garbage_collect(void)
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{
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xfrm6_policy_afinfo.garbage_collect();
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return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
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}
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static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
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{
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struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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struct dst_entry *path = xdst->route;
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path->ops->update_pmtu(path, mtu);
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}
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static void xfrm6_dst_destroy(struct dst_entry *dst)
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{
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struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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if (likely(xdst->u.rt6.rt6i_idev))
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in6_dev_put(xdst->u.rt6.rt6i_idev);
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xfrm_dst_destroy(xdst);
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}
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static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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int unregister)
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{
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struct xfrm_dst *xdst;
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if (!unregister)
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return;
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xdst = (struct xfrm_dst *)dst;
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if (xdst->u.rt6.rt6i_idev->dev == dev) {
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struct inet6_dev *loopback_idev = in6_dev_get(init_net.loopback_dev);
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BUG_ON(!loopback_idev);
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do {
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in6_dev_put(xdst->u.rt6.rt6i_idev);
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xdst->u.rt6.rt6i_idev = loopback_idev;
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in6_dev_hold(loopback_idev);
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xdst = (struct xfrm_dst *)xdst->u.dst.child;
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} while (xdst->u.dst.xfrm);
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__in6_dev_put(loopback_idev);
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}
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xfrm_dst_ifdown(dst, dev);
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}
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static struct dst_ops xfrm6_dst_ops = {
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.family = AF_INET6,
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.protocol = __constant_htons(ETH_P_IPV6),
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.gc = xfrm6_garbage_collect,
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.update_pmtu = xfrm6_update_pmtu,
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.destroy = xfrm6_dst_destroy,
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.ifdown = xfrm6_dst_ifdown,
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.local_out = __ip6_local_out,
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.gc_thresh = 1024,
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.entry_size = sizeof(struct xfrm_dst),
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};
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static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
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.family = AF_INET6,
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.dst_ops = &xfrm6_dst_ops,
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.dst_lookup = xfrm6_dst_lookup,
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.get_saddr = xfrm6_get_saddr,
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.find_bundle = __xfrm6_find_bundle,
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.decode_session = _decode_session6,
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.get_tos = xfrm6_get_tos,
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.fill_dst = xfrm6_fill_dst,
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};
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static void __init xfrm6_policy_init(void)
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{
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xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
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}
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static void xfrm6_policy_fini(void)
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{
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xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
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}
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void __init xfrm6_init(void)
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{
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xfrm6_policy_init();
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xfrm6_state_init();
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}
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void xfrm6_fini(void)
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{
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//xfrm6_input_fini();
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xfrm6_policy_fini();
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xfrm6_state_fini();
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}
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