703fb94ec5
The xfrm gc threshold value depends on ip_rt_max_size. This value was set to INT_MAX with the routing cache removal patch, so we start doing garbage collecting when we have INT_MAX/2 IPsec routes cached. Fix this by going back to the static threshold of 1024 routes. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
294 lines
6.6 KiB
C
294 lines
6.6 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 <linux/if_tunnel.h>
|
|
#include <net/dst.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/ip.h>
|
|
|
|
static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
|
|
|
|
static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
|
|
int tos,
|
|
const xfrm_address_t *saddr,
|
|
const xfrm_address_t *daddr)
|
|
{
|
|
struct rtable *rt;
|
|
|
|
memset(fl4, 0, sizeof(*fl4));
|
|
fl4->daddr = daddr->a4;
|
|
fl4->flowi4_tos = tos;
|
|
if (saddr)
|
|
fl4->saddr = saddr->a4;
|
|
|
|
rt = __ip_route_output_key(net, fl4);
|
|
if (!IS_ERR(rt))
|
|
return &rt->dst;
|
|
|
|
return ERR_CAST(rt);
|
|
}
|
|
|
|
static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos,
|
|
const xfrm_address_t *saddr,
|
|
const xfrm_address_t *daddr)
|
|
{
|
|
struct flowi4 fl4;
|
|
|
|
return __xfrm4_dst_lookup(net, &fl4, tos, saddr, daddr);
|
|
}
|
|
|
|
static int xfrm4_get_saddr(struct net *net,
|
|
xfrm_address_t *saddr, xfrm_address_t *daddr)
|
|
{
|
|
struct dst_entry *dst;
|
|
struct flowi4 fl4;
|
|
|
|
dst = __xfrm4_dst_lookup(net, &fl4, 0, NULL, daddr);
|
|
if (IS_ERR(dst))
|
|
return -EHOSTUNREACH;
|
|
|
|
saddr->a4 = fl4.saddr;
|
|
dst_release(dst);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm4_get_tos(const struct flowi *fl)
|
|
{
|
|
return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; /* Strip ECN bits */
|
|
}
|
|
|
|
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,
|
|
const struct flowi *fl)
|
|
{
|
|
struct rtable *rt = (struct rtable *)xdst->route;
|
|
const struct flowi4 *fl4 = &fl->u.ip4;
|
|
|
|
xdst->u.rt.rt_iif = fl4->flowi4_iif;
|
|
|
|
xdst->u.dst.dev = dev;
|
|
dev_hold(dev);
|
|
|
|
/* Sheit... I remember I did this right. Apparently,
|
|
* it was magically lost, so this code needs audit */
|
|
xdst->u.rt.rt_is_input = rt->rt_is_input;
|
|
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_gateway = rt->rt_gateway;
|
|
xdst->u.rt.rt_uses_gateway = rt->rt_uses_gateway;
|
|
xdst->u.rt.rt_pmtu = rt->rt_pmtu;
|
|
INIT_LIST_HEAD(&xdst->u.rt.rt_uncached);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
_decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
|
|
struct flowi4 *fl4 = &fl->u.ip4;
|
|
|
|
memset(fl4, 0, sizeof(struct flowi4));
|
|
fl4->flowi4_mark = skb->mark;
|
|
|
|
if (!ip_is_fragment(iph)) {
|
|
switch (iph->protocol) {
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_SCTP:
|
|
case IPPROTO_DCCP:
|
|
if (xprth + 4 < skb->data ||
|
|
pskb_may_pull(skb, xprth + 4 - skb->data)) {
|
|
__be16 *ports = (__be16 *)xprth;
|
|
|
|
fl4->fl4_sport = ports[!!reverse];
|
|
fl4->fl4_dport = ports[!reverse];
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_ICMP:
|
|
if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
|
|
u8 *icmp = xprth;
|
|
|
|
fl4->fl4_icmp_type = icmp[0];
|
|
fl4->fl4_icmp_code = icmp[1];
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_ESP:
|
|
if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
|
|
__be32 *ehdr = (__be32 *)xprth;
|
|
|
|
fl4->fl4_ipsec_spi = ehdr[0];
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_AH:
|
|
if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
|
|
__be32 *ah_hdr = (__be32 *)xprth;
|
|
|
|
fl4->fl4_ipsec_spi = ah_hdr[1];
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_COMP:
|
|
if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
|
|
__be16 *ipcomp_hdr = (__be16 *)xprth;
|
|
|
|
fl4->fl4_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
|
|
}
|
|
break;
|
|
|
|
case IPPROTO_GRE:
|
|
if (pskb_may_pull(skb, xprth + 12 - skb->data)) {
|
|
__be16 *greflags = (__be16 *)xprth;
|
|
__be32 *gre_hdr = (__be32 *)xprth;
|
|
|
|
if (greflags[0] & GRE_KEY) {
|
|
if (greflags[0] & GRE_CSUM)
|
|
gre_hdr++;
|
|
fl4->fl4_gre_key = gre_hdr[1];
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fl4->fl4_ipsec_spi = 0;
|
|
break;
|
|
}
|
|
}
|
|
fl4->flowi4_proto = iph->protocol;
|
|
fl4->daddr = reverse ? iph->saddr : iph->daddr;
|
|
fl4->saddr = reverse ? iph->daddr : iph->saddr;
|
|
fl4->flowi4_tos = iph->tos;
|
|
}
|
|
|
|
static inline int xfrm4_garbage_collect(struct dst_ops *ops)
|
|
{
|
|
struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
|
|
|
|
xfrm4_policy_afinfo.garbage_collect(net);
|
|
return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
|
|
}
|
|
|
|
static void xfrm4_update_pmtu(struct dst_entry *dst, struct sock *sk,
|
|
struct sk_buff *skb, u32 mtu)
|
|
{
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
struct dst_entry *path = xdst->route;
|
|
|
|
path->ops->update_pmtu(path, sk, skb, mtu);
|
|
}
|
|
|
|
static void xfrm4_redirect(struct dst_entry *dst, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
struct dst_entry *path = xdst->route;
|
|
|
|
path->ops->redirect(path, sk, skb);
|
|
}
|
|
|
|
static void xfrm4_dst_destroy(struct dst_entry *dst)
|
|
{
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
|
|
dst_destroy_metrics_generic(dst);
|
|
|
|
xfrm_dst_destroy(xdst);
|
|
}
|
|
|
|
static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
|
|
int unregister)
|
|
{
|
|
if (!unregister)
|
|
return;
|
|
|
|
xfrm_dst_ifdown(dst, dev);
|
|
}
|
|
|
|
static struct dst_ops xfrm4_dst_ops = {
|
|
.family = AF_INET,
|
|
.protocol = cpu_to_be16(ETH_P_IP),
|
|
.gc = xfrm4_garbage_collect,
|
|
.update_pmtu = xfrm4_update_pmtu,
|
|
.redirect = xfrm4_redirect,
|
|
.cow_metrics = dst_cow_metrics_generic,
|
|
.destroy = xfrm4_dst_destroy,
|
|
.ifdown = xfrm4_dst_ifdown,
|
|
.local_out = __ip_local_out,
|
|
.gc_thresh = 1024,
|
|
};
|
|
|
|
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,
|
|
.decode_session = _decode_session4,
|
|
.get_tos = xfrm4_get_tos,
|
|
.init_path = xfrm4_init_path,
|
|
.fill_dst = xfrm4_fill_dst,
|
|
.blackhole_route = ipv4_blackhole_route,
|
|
};
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static struct ctl_table xfrm4_policy_table[] = {
|
|
{
|
|
.procname = "xfrm4_gc_thresh",
|
|
.data = &init_net.xfrm.xfrm4_dst_ops.gc_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table_header *sysctl_hdr;
|
|
#endif
|
|
|
|
static void __init xfrm4_policy_init(void)
|
|
{
|
|
xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
|
|
}
|
|
|
|
static void __exit xfrm4_policy_fini(void)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
if (sysctl_hdr)
|
|
unregister_net_sysctl_table(sysctl_hdr);
|
|
#endif
|
|
xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
|
|
}
|
|
|
|
void __init xfrm4_init(void)
|
|
{
|
|
dst_entries_init(&xfrm4_dst_ops);
|
|
|
|
xfrm4_state_init();
|
|
xfrm4_policy_init();
|
|
#ifdef CONFIG_SYSCTL
|
|
sysctl_hdr = register_net_sysctl(&init_net, "net/ipv4",
|
|
xfrm4_policy_table);
|
|
#endif
|
|
}
|
|
|