mirror of https://gitee.com/openkylin/linux.git
324 lines
7.4 KiB
C
324 lines
7.4 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/err.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/dst.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/ip.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip6_route.h>
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
|
#include <net/mip6.h>
|
|
#endif
|
|
|
|
static struct dst_ops xfrm6_dst_ops;
|
|
static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
|
|
|
|
static struct dst_entry *xfrm6_dst_lookup(int tos, xfrm_address_t *saddr,
|
|
xfrm_address_t *daddr)
|
|
{
|
|
struct flowi fl = {};
|
|
struct dst_entry *dst;
|
|
int err;
|
|
|
|
memcpy(&fl.fl6_dst, daddr, sizeof(fl.fl6_dst));
|
|
if (saddr)
|
|
memcpy(&fl.fl6_src, saddr, sizeof(fl.fl6_src));
|
|
|
|
dst = ip6_route_output(NULL, &fl);
|
|
|
|
err = dst->error;
|
|
if (dst->error) {
|
|
dst_release(dst);
|
|
dst = ERR_PTR(err);
|
|
}
|
|
|
|
return dst;
|
|
}
|
|
|
|
static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
dst = xfrm6_dst_lookup(0, NULL, daddr);
|
|
if (IS_ERR(dst))
|
|
return -EHOSTUNREACH;
|
|
|
|
ipv6_get_saddr(dst, (struct in6_addr *)&daddr->a6,
|
|
(struct in6_addr *)&saddr->a6);
|
|
dst_release(dst);
|
|
return 0;
|
|
}
|
|
|
|
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 int xfrm6_get_tos(struct flowi *fl)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
|
|
int nfheader_len)
|
|
{
|
|
if (dst->ops->family == AF_INET6) {
|
|
struct rt6_info *rt = (struct rt6_info*)dst;
|
|
if (rt->rt6i_node)
|
|
path->path_cookie = rt->rt6i_node->fn_sernum;
|
|
}
|
|
|
|
path->u.rt6.rt6i_nfheader_len = nfheader_len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
|
|
{
|
|
struct rt6_info *rt = (struct rt6_info*)xdst->route;
|
|
|
|
xdst->u.dst.dev = dev;
|
|
dev_hold(dev);
|
|
|
|
xdst->u.rt6.rt6i_idev = in6_dev_get(rt->u.dst.dev);
|
|
if (!xdst->u.rt6.rt6i_idev)
|
|
return -ENODEV;
|
|
|
|
/* Sheit... I remember I did this right. Apparently,
|
|
* it was magically lost, so this code needs audit */
|
|
xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
|
|
RTF_LOCAL);
|
|
xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
|
|
xdst->u.rt6.rt6i_node = rt->rt6i_node;
|
|
if (rt->rt6i_node)
|
|
xdst->route_cookie = rt->rt6i_node->fn_sernum;
|
|
xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
|
|
xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
|
|
xdst->u.rt6.rt6i_src = rt->rt6i_src;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
|
|
{
|
|
u16 offset = skb_network_header_len(skb);
|
|
struct ipv6hdr *hdr = ipv6_hdr(skb);
|
|
struct ipv6_opt_hdr *exthdr;
|
|
const unsigned char *nh = skb_network_header(skb);
|
|
u8 nexthdr = nh[IP6CB(skb)->nhoff];
|
|
|
|
memset(fl, 0, sizeof(struct flowi));
|
|
ipv6_addr_copy(&fl->fl6_dst, reverse ? &hdr->saddr : &hdr->daddr);
|
|
ipv6_addr_copy(&fl->fl6_src, reverse ? &hdr->daddr : &hdr->saddr);
|
|
|
|
while (pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
|
|
nh = skb_network_header(skb);
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
|
|
|
switch (nexthdr) {
|
|
case NEXTHDR_ROUTING:
|
|
case NEXTHDR_HOP:
|
|
case NEXTHDR_DEST:
|
|
offset += ipv6_optlen(exthdr);
|
|
nexthdr = exthdr->nexthdr;
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
|
break;
|
|
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_SCTP:
|
|
case IPPROTO_DCCP:
|
|
if (pskb_may_pull(skb, nh + offset + 4 - skb->data)) {
|
|
__be16 *ports = (__be16 *)exthdr;
|
|
|
|
fl->fl_ip_sport = ports[!!reverse];
|
|
fl->fl_ip_dport = ports[!reverse];
|
|
}
|
|
fl->proto = nexthdr;
|
|
return;
|
|
|
|
case IPPROTO_ICMPV6:
|
|
if (pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
|
|
u8 *icmp = (u8 *)exthdr;
|
|
|
|
fl->fl_icmp_type = icmp[0];
|
|
fl->fl_icmp_code = icmp[1];
|
|
}
|
|
fl->proto = nexthdr;
|
|
return;
|
|
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
|
case IPPROTO_MH:
|
|
if (pskb_may_pull(skb, nh + 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(struct dst_ops *ops)
|
|
{
|
|
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(dev->nd_net->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,
|
|
.local_out = __ip6_local_out,
|
|
.gc_thresh = 1024,
|
|
.entry_size = sizeof(struct xfrm_dst),
|
|
.entries = ATOMIC_INIT(0),
|
|
};
|
|
|
|
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,
|
|
.decode_session = _decode_session6,
|
|
.get_tos = xfrm6_get_tos,
|
|
.init_path = xfrm6_init_path,
|
|
.fill_dst = xfrm6_fill_dst,
|
|
};
|
|
|
|
static int __init xfrm6_policy_init(void)
|
|
{
|
|
return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
|
|
}
|
|
|
|
static void xfrm6_policy_fini(void)
|
|
{
|
|
xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
|
|
}
|
|
|
|
int __init xfrm6_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = xfrm6_policy_init();
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = xfrm6_state_init();
|
|
if (ret)
|
|
goto out_policy;
|
|
out:
|
|
return ret;
|
|
out_policy:
|
|
xfrm6_policy_fini();
|
|
goto out;
|
|
}
|
|
|
|
void xfrm6_fini(void)
|
|
{
|
|
//xfrm6_input_fini();
|
|
xfrm6_policy_fini();
|
|
xfrm6_state_fini();
|
|
}
|