[IPSEC]: Sync series - core changes
This patch provides the core functionality needed for sync events
for ipsec. Derived work of Krisztian KOVACS <hidden@balabit.hu>
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 6e8880e..b686548 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -261,6 +261,8 @@
NET_CORE_DEV_WEIGHT=17,
NET_CORE_SOMAXCONN=18,
NET_CORE_BUDGET=19,
+ NET_CORE_AEVENT_ETIME=20,
+ NET_CORE_AEVENT_RSEQTH=21,
};
/* /proc/sys/net/ethernet */
diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index 82fbb75..b54a129 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -156,6 +156,10 @@
XFRM_MSG_FLUSHPOLICY,
#define XFRM_MSG_FLUSHPOLICY XFRM_MSG_FLUSHPOLICY
+ XFRM_MSG_NEWAE,
+#define XFRM_MSG_NEWAE XFRM_MSG_NEWAE
+ XFRM_MSG_GETAE,
+#define XFRM_MSG_GETAE XFRM_MSG_GETAE
__XFRM_MSG_MAX
};
#define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)
@@ -194,6 +198,21 @@
xfrm_address_t encap_oa;
};
+/* AEVENT flags */
+enum xfrm_ae_ftype_t {
+ XFRM_AE_UNSPEC,
+ XFRM_AE_RTHR=1, /* replay threshold*/
+ XFRM_AE_RVAL=2, /* replay value */
+ XFRM_AE_LVAL=4, /* lifetime value */
+ XFRM_AE_ETHR=8, /* expiry timer threshold */
+ XFRM_AE_CR=16, /* Event cause is replay update */
+ XFRM_AE_CE=32, /* Event cause is timer expiry */
+ XFRM_AE_CU=64, /* Event cause is policy update */
+ __XFRM_AE_MAX
+
+#define XFRM_AE_MAX (__XFRM_AE_MAX - 1)
+};
+
/* Netlink message attributes. */
enum xfrm_attr_type_t {
XFRMA_UNSPEC,
@@ -205,6 +224,10 @@
XFRMA_SA,
XFRMA_POLICY,
XFRMA_SEC_CTX, /* struct xfrm_sec_ctx */
+ XFRMA_LTIME_VAL,
+ XFRMA_REPLAY_VAL,
+ XFRMA_REPLAY_THRESH,
+ XFRMA_ETIMER_THRESH,
__XFRMA_MAX
#define XFRMA_MAX (__XFRMA_MAX - 1)
@@ -235,6 +258,11 @@
__u8 proto;
};
+struct xfrm_aevent_id {
+ __u32 flags;
+ struct xfrm_usersa_id sa_id;
+};
+
struct xfrm_userspi_info {
struct xfrm_usersa_info info;
__u32 min;
@@ -306,6 +334,8 @@
#define XFRMNLGRP_SA XFRMNLGRP_SA
XFRMNLGRP_POLICY,
#define XFRMNLGRP_POLICY XFRMNLGRP_POLICY
+ XFRMNLGRP_AEVENTS,
+#define XFRMNLGRP_AEVENTS XFRMNLGRP_AEVENTS
__XFRMNLGRP_MAX
};
#define XFRMNLGRP_MAX (__XFRMNLGRP_MAX - 1)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 8d362c4..bc005e6 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -20,6 +20,10 @@
#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
+extern struct sock *xfrm_nl;
+extern u32 sysctl_xfrm_aevent_etime;
+extern u32 sysctl_xfrm_aevent_rseqth;
+
extern struct semaphore xfrm_cfg_sem;
/* Organization of SPD aka "XFRM rules"
@@ -135,6 +139,16 @@
/* State for replay detection */
struct xfrm_replay_state replay;
+ /* Replay detection state at the time we sent the last notification */
+ struct xfrm_replay_state preplay;
+
+ /* Replay detection notification settings */
+ u32 replay_maxage;
+ u32 replay_maxdiff;
+
+ /* Replay detection notification timer */
+ struct timer_list rtimer;
+
/* Statistics */
struct xfrm_stats stats;
@@ -169,6 +183,7 @@
u32 hard;
u32 proto;
u32 byid;
+ u32 aevent;
} data;
u32 seq;
@@ -305,7 +320,21 @@
struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
};
-#define XFRM_KM_TIMEOUT 30
+#define XFRM_KM_TIMEOUT 30
+/* which seqno */
+#define XFRM_REPLAY_SEQ 1
+#define XFRM_REPLAY_OSEQ 2
+#define XFRM_REPLAY_SEQ_MASK 3
+/* what happened */
+#define XFRM_REPLAY_UPDATE XFRM_AE_CR
+#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
+
+/* default aevent timeout in units of 100ms */
+#define XFRM_AE_ETIME 10
+/* Async Event timer multiplier */
+#define XFRM_AE_ETH_M 10
+/* default seq threshold size */
+#define XFRM_AE_SEQT_SIZE 2
struct xfrm_mgr
{
@@ -865,6 +894,7 @@
extern void xfrm_state_flush(u8 proto);
extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
+extern void xfrm_replay_notify(struct xfrm_state *x, int event);
extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
extern int xfrm_init_state(struct xfrm_state *x);
@@ -965,4 +995,16 @@
return index & 7;
}
+static inline int xfrm_aevent_is_on(void)
+{
+ return netlink_has_listeners(xfrm_nl,XFRMNLGRP_AEVENTS);
+}
+
+static inline void xfrm_aevent_doreplay(struct xfrm_state *x)
+{
+ if (xfrm_aevent_is_on())
+ xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
+}
+
+
#endif /* _NET_XFRM_H */
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 2f278c8..7104536 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -26,6 +26,11 @@
extern char sysctl_divert_version[];
#endif /* CONFIG_NET_DIVERT */
+#ifdef CONFIG_XFRM
+extern u32 sysctl_xfrm_aevent_etime;
+extern u32 sysctl_xfrm_aevent_rseqth;
+#endif
+
ctl_table core_table[] = {
#ifdef CONFIG_NET
{
@@ -111,6 +116,24 @@
.proc_handler = &proc_dostring
},
#endif /* CONFIG_NET_DIVERT */
+#ifdef CONFIG_XFRM
+ {
+ .ctl_name = NET_CORE_AEVENT_ETIME,
+ .procname = "xfrm_aevent_etime",
+ .data = &sysctl_xfrm_aevent_etime,
+ .maxlen = sizeof(u32),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec
+ },
+ {
+ .ctl_name = NET_CORE_AEVENT_RSEQTH,
+ .procname = "xfrm_aevent_rseqth",
+ .data = &sysctl_xfrm_aevent_rseqth,
+ .maxlen = sizeof(u32),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec
+ },
+#endif /* CONFIG_XFRM */
#endif /* CONFIG_NET */
{
.ctl_name = NET_CORE_SOMAXCONN,
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index c656cba..8eaee49 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -20,6 +20,8 @@
#include <linux/module.h>
#include <asm/uaccess.h>
+u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME;
+u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE;
/* Each xfrm_state may be linked to two tables:
1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
@@ -62,6 +64,8 @@
{
if (del_timer(&x->timer))
BUG();
+ if (del_timer(&x->rtimer))
+ BUG();
kfree(x->aalg);
kfree(x->ealg);
kfree(x->calg);
@@ -190,11 +194,16 @@
init_timer(&x->timer);
x->timer.function = xfrm_timer_handler;
x->timer.data = (unsigned long)x;
+ init_timer(&x->rtimer);
+ x->rtimer.function = xfrm_replay_timer_handler;
+ x->rtimer.data = (unsigned long)x;
x->curlft.add_time = (unsigned long)xtime.tv_sec;
x->lft.soft_byte_limit = XFRM_INF;
x->lft.soft_packet_limit = XFRM_INF;
x->lft.hard_byte_limit = XFRM_INF;
x->lft.hard_packet_limit = XFRM_INF;
+ x->replay_maxage = 0;
+ x->replay_maxdiff = 0;
spin_lock_init(&x->lock);
}
return x;
@@ -228,6 +237,8 @@
spin_unlock(&xfrm_state_lock);
if (del_timer(&x->timer))
__xfrm_state_put(x);
+ if (del_timer(&x->rtimer))
+ __xfrm_state_put(x);
/* The number two in this test is the reference
* mentioned in the comment below plus the reference
@@ -426,6 +437,10 @@
if (!mod_timer(&x->timer, jiffies + HZ))
xfrm_state_hold(x);
+ if (x->replay_maxage &&
+ !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
+ xfrm_state_hold(x);
+
wake_up(&km_waitq);
}
@@ -762,6 +777,62 @@
}
EXPORT_SYMBOL(xfrm_state_walk);
+
+void xfrm_replay_notify(struct xfrm_state *x, int event)
+{
+ struct km_event c;
+ /* we send notify messages in case
+ * 1. we updated on of the sequence numbers, and the seqno difference
+ * is at least x->replay_maxdiff, in this case we also update the
+ * timeout of our timer function
+ * 2. if x->replay_maxage has elapsed since last update,
+ * and there were changes
+ *
+ * The state structure must be locked!
+ */
+
+ switch (event) {
+ case XFRM_REPLAY_UPDATE:
+ if (x->replay_maxdiff &&
+ (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
+ (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff))
+ return;
+
+ break;
+
+ case XFRM_REPLAY_TIMEOUT:
+ if ((x->replay.seq == x->preplay.seq) &&
+ (x->replay.bitmap == x->preplay.bitmap) &&
+ (x->replay.oseq == x->preplay.oseq))
+ return;
+
+ break;
+ }
+
+ memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
+ c.event = XFRM_MSG_NEWAE;
+ c.data.aevent = event;
+ km_state_notify(x, &c);
+
+resched:
+ if (x->replay_maxage &&
+ !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
+ xfrm_state_hold(x);
+
+}
+
+static void xfrm_replay_timer_handler(unsigned long data)
+{
+ struct xfrm_state *x = (struct xfrm_state*)data;
+
+ spin_lock(&x->lock);
+
+ if (xfrm_aevent_is_on() && x->km.state == XFRM_STATE_VALID)
+ xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
+
+ spin_unlock(&x->lock);
+}
+
int xfrm_replay_check(struct xfrm_state *x, u32 seq)
{
u32 diff;
@@ -805,6 +876,9 @@
diff = x->replay.seq - seq;
x->replay.bitmap |= (1U << diff);
}
+
+ if (xfrm_aevent_is_on())
+ xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
}
EXPORT_SYMBOL(xfrm_replay_advance);
@@ -835,7 +909,7 @@
EXPORT_SYMBOL(km_policy_notify);
EXPORT_SYMBOL(km_state_notify);
-static void km_state_expired(struct xfrm_state *x, int hard)
+void km_state_expired(struct xfrm_state *x, int hard)
{
struct km_event c;
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 7de1755..6f643e5 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -28,7 +28,7 @@
#include <net/netlink.h>
#include <asm/uaccess.h>
-static struct sock *xfrm_nl;
+struct sock *xfrm_nl;
static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
{
@@ -1618,3 +1618,5 @@
module_exit(xfrm_user_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
+EXPORT_SYMBOL(xfrm_nl);
+