416 lines
10 KiB
C
416 lines
10 KiB
C
/*
|
|
* xfrm6_policy.c: based on xfrm4_policy.c
|
|
*
|
|
* Authors:
|
|
* Mitsuru KANDA @USAGI
|
|
* Kazunori MIYAZAWA @USAGI
|
|
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
|
|
* IPv6 support
|
|
* YOSHIFUJI Hideaki
|
|
* Split up af-specific portion
|
|
*
|
|
*/
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/netdevice.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/ip.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip6_route.h>
|
|
#ifdef CONFIG_IPV6_MIP6
|
|
#include <net/mip6.h>
|
|
#endif
|
|
|
|
static struct dst_ops xfrm6_dst_ops;
|
|
static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
|
|
|
|
static int xfrm6_dst_lookup(struct xfrm_dst **xdst, struct flowi *fl)
|
|
{
|
|
struct dst_entry *dst = ip6_route_output(NULL, fl);
|
|
int err = dst->error;
|
|
if (!err)
|
|
*xdst = (struct xfrm_dst *) dst;
|
|
else
|
|
dst_release(dst);
|
|
return err;
|
|
}
|
|
|
|
static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
|
|
{
|
|
struct rt6_info *rt;
|
|
struct flowi fl_tunnel = {
|
|
.nl_u = {
|
|
.ip6_u = {
|
|
.daddr = *(struct in6_addr *)&daddr->a6,
|
|
},
|
|
},
|
|
};
|
|
|
|
if (!xfrm6_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel)) {
|
|
ipv6_get_saddr(&rt->u.dst, (struct in6_addr *)&daddr->a6,
|
|
(struct in6_addr *)&saddr->a6);
|
|
dst_release(&rt->u.dst);
|
|
return 0;
|
|
}
|
|
return -EHOSTUNREACH;
|
|
}
|
|
|
|
static struct dst_entry *
|
|
__xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
/* Still not clear if we should set fl->fl6_{src,dst}... */
|
|
read_lock_bh(&policy->lock);
|
|
for (dst = policy->bundles; dst; dst = dst->next) {
|
|
struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
|
|
struct in6_addr fl_dst_prefix, fl_src_prefix;
|
|
|
|
ipv6_addr_prefix(&fl_dst_prefix,
|
|
&fl->fl6_dst,
|
|
xdst->u.rt6.rt6i_dst.plen);
|
|
ipv6_addr_prefix(&fl_src_prefix,
|
|
&fl->fl6_src,
|
|
xdst->u.rt6.rt6i_src.plen);
|
|
if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
|
|
ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
|
|
xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
|
|
(xdst->u.rt6.rt6i_dst.plen != 128 ||
|
|
xdst->u.rt6.rt6i_src.plen != 128))) {
|
|
dst_clone(dst);
|
|
break;
|
|
}
|
|
}
|
|
read_unlock_bh(&policy->lock);
|
|
return dst;
|
|
}
|
|
|
|
static inline struct in6_addr*
|
|
__xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
|
|
{
|
|
return (x->type->remote_addr) ?
|
|
(struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
|
|
(struct in6_addr*)&x->id.daddr;
|
|
}
|
|
|
|
static inline struct in6_addr*
|
|
__xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
|
|
{
|
|
return (x->type->local_addr) ?
|
|
(struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
|
|
(struct in6_addr*)&x->props.saddr;
|
|
}
|
|
|
|
static inline void
|
|
__xfrm6_bundle_len_inc(int *len, int *nflen, struct xfrm_state *x)
|
|
{
|
|
if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
|
|
*nflen += x->props.header_len;
|
|
else
|
|
*len += x->props.header_len;
|
|
}
|
|
|
|
static inline void
|
|
__xfrm6_bundle_len_dec(int *len, int *nflen, struct xfrm_state *x)
|
|
{
|
|
if (x->type->flags & XFRM_TYPE_NON_FRAGMENT)
|
|
*nflen -= x->props.header_len;
|
|
else
|
|
*len -= x->props.header_len;
|
|
}
|
|
|
|
/* Allocate chain of dst_entry's, attach known xfrm's, calculate
|
|
* all the metrics... Shortly, bundle a bundle.
|
|
*/
|
|
|
|
static int
|
|
__xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
|
|
struct flowi *fl, struct dst_entry **dst_p)
|
|
{
|
|
struct dst_entry *dst, *dst_prev;
|
|
struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
|
|
struct rt6_info *rt = rt0;
|
|
struct in6_addr *remote = &fl->fl6_dst;
|
|
struct in6_addr *local = &fl->fl6_src;
|
|
struct flowi fl_tunnel = {
|
|
.nl_u = {
|
|
.ip6_u = {
|
|
.saddr = *local,
|
|
.daddr = *remote
|
|
}
|
|
}
|
|
};
|
|
int i;
|
|
int err = 0;
|
|
int header_len = 0;
|
|
int nfheader_len = 0;
|
|
int trailer_len = 0;
|
|
|
|
dst = dst_prev = NULL;
|
|
dst_hold(&rt->u.dst);
|
|
|
|
for (i = 0; i < nx; i++) {
|
|
struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
|
|
struct xfrm_dst *xdst;
|
|
int tunnel = 0;
|
|
|
|
if (unlikely(dst1 == NULL)) {
|
|
err = -ENOBUFS;
|
|
dst_release(&rt->u.dst);
|
|
goto error;
|
|
}
|
|
|
|
if (!dst)
|
|
dst = dst1;
|
|
else {
|
|
dst_prev->child = dst1;
|
|
dst1->flags |= DST_NOHASH;
|
|
dst_clone(dst1);
|
|
}
|
|
|
|
xdst = (struct xfrm_dst *)dst1;
|
|
xdst->route = &rt->u.dst;
|
|
xdst->genid = xfrm[i]->genid;
|
|
if (rt->rt6i_node)
|
|
xdst->route_cookie = rt->rt6i_node->fn_sernum;
|
|
|
|
dst1->next = dst_prev;
|
|
dst_prev = dst1;
|
|
if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
|
|
remote = __xfrm6_bundle_addr_remote(xfrm[i], remote);
|
|
local = __xfrm6_bundle_addr_local(xfrm[i], local);
|
|
tunnel = 1;
|
|
}
|
|
__xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
|
|
trailer_len += xfrm[i]->props.trailer_len;
|
|
|
|
if (tunnel) {
|
|
ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
|
|
ipv6_addr_copy(&fl_tunnel.fl6_src, local);
|
|
err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
|
|
&fl_tunnel, AF_INET6);
|
|
if (err)
|
|
goto error;
|
|
} else
|
|
dst_hold(&rt->u.dst);
|
|
}
|
|
|
|
dst_prev->child = &rt->u.dst;
|
|
dst->path = &rt->u.dst;
|
|
if (rt->rt6i_node)
|
|
((struct xfrm_dst *)dst)->path_cookie = rt->rt6i_node->fn_sernum;
|
|
|
|
*dst_p = dst;
|
|
dst = dst_prev;
|
|
|
|
dst_prev = *dst_p;
|
|
i = 0;
|
|
for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
|
|
struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
|
|
|
|
dst_prev->xfrm = xfrm[i++];
|
|
dst_prev->dev = rt->u.dst.dev;
|
|
if (rt->u.dst.dev)
|
|
dev_hold(rt->u.dst.dev);
|
|
dst_prev->obsolete = -1;
|
|
dst_prev->flags |= DST_HOST;
|
|
dst_prev->lastuse = jiffies;
|
|
dst_prev->header_len = header_len;
|
|
dst_prev->nfheader_len = nfheader_len;
|
|
dst_prev->trailer_len = trailer_len;
|
|
memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics));
|
|
|
|
/* Copy neighbour for reachability confirmation */
|
|
dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
|
|
dst_prev->input = rt->u.dst.input;
|
|
dst_prev->output = xfrm6_output;
|
|
/* Sheit... I remember I did this right. Apparently,
|
|
* it was magically lost, so this code needs audit */
|
|
x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
|
|
x->u.rt6.rt6i_metric = rt0->rt6i_metric;
|
|
x->u.rt6.rt6i_node = rt0->rt6i_node;
|
|
x->u.rt6.rt6i_gateway = rt0->rt6i_gateway;
|
|
memcpy(&x->u.rt6.rt6i_gateway, &rt0->rt6i_gateway, sizeof(x->u.rt6.rt6i_gateway));
|
|
x->u.rt6.rt6i_dst = rt0->rt6i_dst;
|
|
x->u.rt6.rt6i_src = rt0->rt6i_src;
|
|
x->u.rt6.rt6i_idev = rt0->rt6i_idev;
|
|
in6_dev_hold(rt0->rt6i_idev);
|
|
__xfrm6_bundle_len_dec(&header_len, &nfheader_len, x->u.dst.xfrm);
|
|
trailer_len -= x->u.dst.xfrm->props.trailer_len;
|
|
}
|
|
|
|
xfrm_init_pmtu(dst);
|
|
return 0;
|
|
|
|
error:
|
|
if (dst)
|
|
dst_free(dst);
|
|
return err;
|
|
}
|
|
|
|
static inline void
|
|
_decode_session6(struct sk_buff *skb, struct flowi *fl)
|
|
{
|
|
u16 offset = skb->h.raw - skb->nh.raw;
|
|
struct ipv6hdr *hdr = skb->nh.ipv6h;
|
|
struct ipv6_opt_hdr *exthdr;
|
|
u8 nexthdr = skb->nh.raw[IP6CB(skb)->nhoff];
|
|
|
|
memset(fl, 0, sizeof(struct flowi));
|
|
ipv6_addr_copy(&fl->fl6_dst, &hdr->daddr);
|
|
ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
|
|
|
|
while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
|
|
exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
|
|
|
|
switch (nexthdr) {
|
|
case NEXTHDR_ROUTING:
|
|
case NEXTHDR_HOP:
|
|
case NEXTHDR_DEST:
|
|
offset += ipv6_optlen(exthdr);
|
|
nexthdr = exthdr->nexthdr;
|
|
exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
|
|
break;
|
|
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_SCTP:
|
|
case IPPROTO_DCCP:
|
|
if (pskb_may_pull(skb, skb->nh.raw + offset + 4 - skb->data)) {
|
|
__be16 *ports = (__be16 *)exthdr;
|
|
|
|
fl->fl_ip_sport = ports[0];
|
|
fl->fl_ip_dport = ports[1];
|
|
}
|
|
fl->proto = nexthdr;
|
|
return;
|
|
|
|
case IPPROTO_ICMPV6:
|
|
if (pskb_may_pull(skb, skb->nh.raw + offset + 2 - skb->data)) {
|
|
u8 *icmp = (u8 *)exthdr;
|
|
|
|
fl->fl_icmp_type = icmp[0];
|
|
fl->fl_icmp_code = icmp[1];
|
|
}
|
|
fl->proto = nexthdr;
|
|
return;
|
|
|
|
#ifdef CONFIG_IPV6_MIP6
|
|
case IPPROTO_MH:
|
|
if (pskb_may_pull(skb, skb->nh.raw + offset + 3 - skb->data)) {
|
|
struct ip6_mh *mh;
|
|
mh = (struct ip6_mh *)exthdr;
|
|
|
|
fl->fl_mh_type = mh->ip6mh_type;
|
|
}
|
|
fl->proto = nexthdr;
|
|
return;
|
|
#endif
|
|
|
|
/* XXX Why are there these headers? */
|
|
case IPPROTO_AH:
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_COMP:
|
|
default:
|
|
fl->fl_ipsec_spi = 0;
|
|
fl->proto = nexthdr;
|
|
return;
|
|
};
|
|
}
|
|
}
|
|
|
|
static inline int xfrm6_garbage_collect(void)
|
|
{
|
|
xfrm6_policy_afinfo.garbage_collect();
|
|
return (atomic_read(&xfrm6_dst_ops.entries) > xfrm6_dst_ops.gc_thresh*2);
|
|
}
|
|
|
|
static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|
{
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
struct dst_entry *path = xdst->route;
|
|
|
|
path->ops->update_pmtu(path, mtu);
|
|
}
|
|
|
|
static void xfrm6_dst_destroy(struct dst_entry *dst)
|
|
{
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
|
|
if (likely(xdst->u.rt6.rt6i_idev))
|
|
in6_dev_put(xdst->u.rt6.rt6i_idev);
|
|
xfrm_dst_destroy(xdst);
|
|
}
|
|
|
|
static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
|
|
int unregister)
|
|
{
|
|
struct xfrm_dst *xdst;
|
|
|
|
if (!unregister)
|
|
return;
|
|
|
|
xdst = (struct xfrm_dst *)dst;
|
|
if (xdst->u.rt6.rt6i_idev->dev == dev) {
|
|
struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
|
|
BUG_ON(!loopback_idev);
|
|
|
|
do {
|
|
in6_dev_put(xdst->u.rt6.rt6i_idev);
|
|
xdst->u.rt6.rt6i_idev = loopback_idev;
|
|
in6_dev_hold(loopback_idev);
|
|
xdst = (struct xfrm_dst *)xdst->u.dst.child;
|
|
} while (xdst->u.dst.xfrm);
|
|
|
|
__in6_dev_put(loopback_idev);
|
|
}
|
|
|
|
xfrm_dst_ifdown(dst, dev);
|
|
}
|
|
|
|
static struct dst_ops xfrm6_dst_ops = {
|
|
.family = AF_INET6,
|
|
.protocol = __constant_htons(ETH_P_IPV6),
|
|
.gc = xfrm6_garbage_collect,
|
|
.update_pmtu = xfrm6_update_pmtu,
|
|
.destroy = xfrm6_dst_destroy,
|
|
.ifdown = xfrm6_dst_ifdown,
|
|
.gc_thresh = 1024,
|
|
.entry_size = sizeof(struct xfrm_dst),
|
|
};
|
|
|
|
static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
|
|
.family = AF_INET6,
|
|
.dst_ops = &xfrm6_dst_ops,
|
|
.dst_lookup = xfrm6_dst_lookup,
|
|
.get_saddr = xfrm6_get_saddr,
|
|
.find_bundle = __xfrm6_find_bundle,
|
|
.bundle_create = __xfrm6_bundle_create,
|
|
.decode_session = _decode_session6,
|
|
};
|
|
|
|
static void __init xfrm6_policy_init(void)
|
|
{
|
|
xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
|
|
}
|
|
|
|
static void xfrm6_policy_fini(void)
|
|
{
|
|
xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
|
|
}
|
|
|
|
void __init xfrm6_init(void)
|
|
{
|
|
xfrm6_policy_init();
|
|
xfrm6_state_init();
|
|
}
|
|
|
|
void xfrm6_fini(void)
|
|
{
|
|
//xfrm6_input_fini();
|
|
xfrm6_policy_fini();
|
|
xfrm6_state_fini();
|
|
}
|