mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![YOSHIFUJI Hideaki](/assets/img/avatar_default.png)
Introduce per-net_device inlines: dev_net(), dev_net_set(). Without CONFIG_NET_NS, no namespace other than &init_net exists. Let's explicitly define them to help compiler optimizations. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
280 lines
6.1 KiB
C
280 lines
6.1 KiB
C
/*
|
|
* xfrm4_policy.c
|
|
*
|
|
* Changes:
|
|
* Kazunori MIYAZAWA @USAGI
|
|
* YOSHIFUJI Hideaki @USAGI
|
|
* Split up af-specific portion
|
|
*
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/inetdevice.h>
|
|
#include <net/dst.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/ip.h>
|
|
|
|
static struct dst_ops xfrm4_dst_ops;
|
|
static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
|
|
|
|
static struct dst_entry *xfrm4_dst_lookup(int tos, xfrm_address_t *saddr,
|
|
xfrm_address_t *daddr)
|
|
{
|
|
struct flowi fl = {
|
|
.nl_u = {
|
|
.ip4_u = {
|
|
.tos = tos,
|
|
.daddr = daddr->a4,
|
|
},
|
|
},
|
|
};
|
|
struct dst_entry *dst;
|
|
struct rtable *rt;
|
|
int err;
|
|
|
|
if (saddr)
|
|
fl.fl4_src = saddr->a4;
|
|
|
|
err = __ip_route_output_key(&init_net, &rt, &fl);
|
|
dst = &rt->u.dst;
|
|
if (err)
|
|
dst = ERR_PTR(err);
|
|
return dst;
|
|
}
|
|
|
|
static int xfrm4_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr)
|
|
{
|
|
struct dst_entry *dst;
|
|
struct rtable *rt;
|
|
|
|
dst = xfrm4_dst_lookup(0, NULL, daddr);
|
|
if (IS_ERR(dst))
|
|
return -EHOSTUNREACH;
|
|
|
|
rt = (struct rtable *)dst;
|
|
saddr->a4 = rt->rt_src;
|
|
dst_release(dst);
|
|
return 0;
|
|
}
|
|
|
|
static struct dst_entry *
|
|
__xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
read_lock_bh(&policy->lock);
|
|
for (dst = policy->bundles; dst; dst = dst->next) {
|
|
struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
|
|
if (xdst->u.rt.fl.oif == fl->oif && /*XXX*/
|
|
xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
|
|
xdst->u.rt.fl.fl4_src == fl->fl4_src &&
|
|
xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
|
|
xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
|
|
dst_clone(dst);
|
|
break;
|
|
}
|
|
}
|
|
read_unlock_bh(&policy->lock);
|
|
return dst;
|
|
}
|
|
|
|
static int xfrm4_get_tos(struct flowi *fl)
|
|
{
|
|
return fl->fl4_tos;
|
|
}
|
|
|
|
static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
|
|
int nfheader_len)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
|
|
{
|
|
struct rtable *rt = (struct rtable *)xdst->route;
|
|
|
|
xdst->u.rt.fl = rt->fl;
|
|
|
|
xdst->u.dst.dev = dev;
|
|
dev_hold(dev);
|
|
|
|
xdst->u.rt.idev = in_dev_get(dev);
|
|
if (!xdst->u.rt.idev)
|
|
return -ENODEV;
|
|
|
|
xdst->u.rt.peer = rt->peer;
|
|
if (rt->peer)
|
|
atomic_inc(&rt->peer->refcnt);
|
|
|
|
/* Sheit... I remember I did this right. Apparently,
|
|
* it was magically lost, so this code needs audit */
|
|
xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
|
|
RTCF_LOCAL);
|
|
xdst->u.rt.rt_type = rt->rt_type;
|
|
xdst->u.rt.rt_src = rt->rt_src;
|
|
xdst->u.rt.rt_dst = rt->rt_dst;
|
|
xdst->u.rt.rt_gateway = rt->rt_gateway;
|
|
xdst->u.rt.rt_spec_dst = rt->rt_spec_dst;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
_decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
|
|
{
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
|
|
|
|
memset(fl, 0, sizeof(struct flowi));
|
|
if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
|
|
switch (iph->protocol) {
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_SCTP:
|
|
case IPPROTO_DCCP:
|
|
if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
|
|
__be16 *ports = (__be16 *)xprth;
|
|
|
|
fl->fl_ip_sport = ports[!!reverse];
|
|
fl->fl_ip_dport = ports[!reverse];
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_ICMP:
|
|
if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
|
|
u8 *icmp = xprth;
|
|
|
|
fl->fl_icmp_type = icmp[0];
|
|
fl->fl_icmp_code = icmp[1];
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_ESP:
|
|
if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
|
|
__be32 *ehdr = (__be32 *)xprth;
|
|
|
|
fl->fl_ipsec_spi = ehdr[0];
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_AH:
|
|
if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
|
|
__be32 *ah_hdr = (__be32*)xprth;
|
|
|
|
fl->fl_ipsec_spi = ah_hdr[1];
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_COMP:
|
|
if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
|
|
__be16 *ipcomp_hdr = (__be16 *)xprth;
|
|
|
|
fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
|
|
}
|
|
break;
|
|
default:
|
|
fl->fl_ipsec_spi = 0;
|
|
break;
|
|
}
|
|
}
|
|
fl->proto = iph->protocol;
|
|
fl->fl4_dst = reverse ? iph->saddr : iph->daddr;
|
|
fl->fl4_src = reverse ? iph->daddr : iph->saddr;
|
|
fl->fl4_tos = iph->tos;
|
|
}
|
|
|
|
static inline int xfrm4_garbage_collect(struct dst_ops *ops)
|
|
{
|
|
xfrm4_policy_afinfo.garbage_collect();
|
|
return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
|
|
}
|
|
|
|
static void xfrm4_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 xfrm4_dst_destroy(struct dst_entry *dst)
|
|
{
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
|
|
if (likely(xdst->u.rt.idev))
|
|
in_dev_put(xdst->u.rt.idev);
|
|
if (likely(xdst->u.rt.peer))
|
|
inet_putpeer(xdst->u.rt.peer);
|
|
xfrm_dst_destroy(xdst);
|
|
}
|
|
|
|
static void xfrm4_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.rt.idev->dev == dev) {
|
|
struct in_device *loopback_idev =
|
|
in_dev_get(dev_net(dev)->loopback_dev);
|
|
BUG_ON(!loopback_idev);
|
|
|
|
do {
|
|
in_dev_put(xdst->u.rt.idev);
|
|
xdst->u.rt.idev = loopback_idev;
|
|
in_dev_hold(loopback_idev);
|
|
xdst = (struct xfrm_dst *)xdst->u.dst.child;
|
|
} while (xdst->u.dst.xfrm);
|
|
|
|
__in_dev_put(loopback_idev);
|
|
}
|
|
|
|
xfrm_dst_ifdown(dst, dev);
|
|
}
|
|
|
|
static struct dst_ops xfrm4_dst_ops = {
|
|
.family = AF_INET,
|
|
.protocol = __constant_htons(ETH_P_IP),
|
|
.gc = xfrm4_garbage_collect,
|
|
.update_pmtu = xfrm4_update_pmtu,
|
|
.destroy = xfrm4_dst_destroy,
|
|
.ifdown = xfrm4_dst_ifdown,
|
|
.local_out = __ip_local_out,
|
|
.gc_thresh = 1024,
|
|
.entry_size = sizeof(struct xfrm_dst),
|
|
.entries = ATOMIC_INIT(0),
|
|
};
|
|
|
|
static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
|
|
.family = AF_INET,
|
|
.dst_ops = &xfrm4_dst_ops,
|
|
.dst_lookup = xfrm4_dst_lookup,
|
|
.get_saddr = xfrm4_get_saddr,
|
|
.find_bundle = __xfrm4_find_bundle,
|
|
.decode_session = _decode_session4,
|
|
.get_tos = xfrm4_get_tos,
|
|
.init_path = xfrm4_init_path,
|
|
.fill_dst = xfrm4_fill_dst,
|
|
};
|
|
|
|
static void __init xfrm4_policy_init(void)
|
|
{
|
|
xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
|
|
}
|
|
|
|
static void __exit xfrm4_policy_fini(void)
|
|
{
|
|
xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
|
|
}
|
|
|
|
void __init xfrm4_init(void)
|
|
{
|
|
xfrm4_state_init();
|
|
xfrm4_policy_init();
|
|
}
|
|
|