[XFRM]: Netfilter IPsec output hooks

Call netfilter hooks before IPsec transforms. Packets visit the
FORWARD/LOCAL_OUT and POST_ROUTING hook before the first encapsulation
and the LOCAL_OUT and POST_ROUTING hook before each following tunnel mode
transform.

Patch from Herbert Xu <herbert@gondor.apana.org.au>:

Move the loop from dst_output into xfrm4_output/xfrm6_output since they're
the only ones who need to it. xfrm{4,6}_output_one() processes the first SA
all subsequent transport mode SAs and is called in a loop that calls the
netfilter hooks between each two calls.

In order to avoid the tail call issue, I've added the inline function
nf_hook which is nf_hook_slow plus the empty list check.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 148 insertions, 70 deletions

diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index be365e70ee99..79bb977afeac 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -168,6 +168,37 @@ void nf_log_packet(int pf,
                    const struct net_device *out,
                    struct nf_loginfo *li,
                    const char *fmt, ...);
+
+int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb,
+                 struct net_device *indev, struct net_device *outdev,
+                 int (*okfn)(struct sk_buff *), int thresh);
+
+/**
+ *      nf_hook_thresh - call a netfilter hook
+ *      
+ *      Returns 1 if the hook has allowed the packet to pass.  The function
+ *      okfn must be invoked by the caller in this case.  Any other return
+ *      value indicates the packet has been consumed by the hook.
+ */
+static inline int nf_hook_thresh(int pf, unsigned int hook,
+                                 struct sk_buff **pskb,
+                                 struct net_device *indev,
+                                 struct net_device *outdev,
+                                 int (*okfn)(struct sk_buff *), int thresh)
+{
+#ifndef CONFIG_NETFILTER_DEBUG
+        if (list_empty(&nf_hooks[pf][hook]))
+                return 1;
+#endif
+        return nf_hook_slow(pf, hook, pskb, indev, outdev, okfn, thresh);
+}
+
+static inline int nf_hook(int pf, unsigned int hook, struct sk_buff **pskb,
+                          struct net_device *indev, struct net_device *outdev,
+                          int (*okfn)(struct sk_buff *))
+{
+        return nf_hook_thresh(pf, hook, pskb, indev, outdev, okfn, INT_MIN);
+}
                    
 /* Activate hook; either okfn or kfree_skb called, unless a hook
    returns NF_STOLEN (in which case, it's up to the hook to deal with
@@ -188,35 +219,17 @@ void nf_log_packet(int pf,
 
 /* This is gross, but inline doesn't cut it for avoiding the function
    call in fast path: gcc doesn't inline (needs value tracking?). --RR */
-#ifdef CONFIG_NETFILTER_DEBUG
-#define NF_HOOK(pf, hook, skb, indev, outdev, okfn)                            \
-({int __ret;                                                                   \
-if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \
-        __ret = (okfn)(skb);                                                   \
-__ret;})
-#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh)             \
-({int __ret;                                                                   \
-if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1)  \
-        __ret = (okfn)(skb);                                                   \
-__ret;})
-#else
-#define NF_HOOK(pf, hook, skb, indev, outdev, okfn)                            \
-({int __ret;                                                                   \
-if (list_empty(&nf_hooks[pf][hook]) ||                                         \
-    (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \
-        __ret = (okfn)(skb);                                                   \
-__ret;})
+
+/* HX: It's slightly less gross now. */
+
 #define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh)             \
 ({int __ret;                                                                   \
-if (list_empty(&nf_hooks[pf][hook]) ||                                         \
-    (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1)  \
+if ((__ret=nf_hook_thresh(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1)\
         __ret = (okfn)(skb);                                                   \
 __ret;})
-#endif
 
-int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb,
-                 struct net_device *indev, struct net_device *outdev,
-                 int (*okfn)(struct sk_buff *), int thresh);
+#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
+        NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN)
 
 /* Call setsockopt() */
 int nf_setsockopt(struct sock *sk, int pf, int optval, char __user *opt, 
diff --git a/include/net/dst.h b/include/net/dst.h
index bee8b84d329d..5161e89017f9 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -225,16 +225,7 @@ static inline void dst_set_expires(struct dst_entry *dst, int timeout)
 /* Output packet to network from transport.  */
 static inline int dst_output(struct sk_buff *skb)
 {
-        int err;
-
-        for (;;) {
-                err = skb->dst->output(skb);
-
-                if (likely(err == 0))
-                        return err;
-                if (unlikely(err != NET_XMIT_BYPASS))
-                        return err;
-        }
+        return skb->dst->output(skb);
 }
 
 /* Input packet from network to transport.  */
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 66620a95942a..51fabb8f7c54 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -8,8 +8,10 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#include <linux/compiler.h>
 #include <linux/skbuff.h>
 #include <linux/spinlock.h>
+#include <linux/netfilter_ipv4.h>
 #include <net/inet_ecn.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
@@ -95,7 +97,7 @@ out:
         return ret;
 }
 
-int xfrm4_output(struct sk_buff *skb)
+static int xfrm4_output_one(struct sk_buff *skb)
 {
         struct dst_entry *dst = skb->dst;
         struct xfrm_state *x = dst->xfrm;
@@ -113,27 +115,32 @@ int xfrm4_output(struct sk_buff *skb)
                         goto error_nolock;
         }
 
-        spin_lock_bh(&x->lock);
-        err = xfrm_state_check(x, skb);
-        if (err)
-                goto error;
+        do {
+                spin_lock_bh(&x->lock);
+                err = xfrm_state_check(x, skb);
+                if (err)
+                        goto error;
 
-        xfrm4_encap(skb);
+                xfrm4_encap(skb);
 
-        err = x->type->output(x, skb);
-        if (err)
-                goto error;
+                err = x->type->output(x, skb);
+                if (err)
+                        goto error;
 
-        x->curlft.bytes += skb->len;
-        x->curlft.packets++;
+                x->curlft.bytes += skb->len;
+                x->curlft.packets++;
 
-        spin_unlock_bh(&x->lock);
+                spin_unlock_bh(&x->lock);
         
-        if (!(skb->dst = dst_pop(dst))) {
-                err = -EHOSTUNREACH;
-                goto error_nolock;
-        }
-        err = NET_XMIT_BYPASS;
+                if (!(skb->dst = dst_pop(dst))) {
+                        err = -EHOSTUNREACH;
+                        goto error_nolock;
+                }
+                dst = skb->dst;
+                x = dst->xfrm;
+        } while (x && !x->props.mode);
+
+        err = 0;
 
 out_exit:
         return err;
@@ -143,3 +150,33 @@ error_nolock:
         kfree_skb(skb);
         goto out_exit;
 }
+
+static int xfrm4_output_finish(struct sk_buff *skb)
+{
+        int err;
+
+        while (likely((err = xfrm4_output_one(skb)) == 0)) {
+                nf_reset(skb);
+
+                err = nf_hook(PF_INET, NF_IP_LOCAL_OUT, &skb, NULL,
+                              skb->dst->dev, dst_output);
+                if (unlikely(err != 1))
+                        break;
+
+                if (!skb->dst->xfrm)
+                        return dst_output(skb);
+
+                err = nf_hook(PF_INET, NF_IP_POST_ROUTING, &skb, NULL,
+                              skb->dst->dev, xfrm4_output_finish);
+                if (unlikely(err != 1))
+                        break;
+        }
+
+        return err;
+}
+
+int xfrm4_output(struct sk_buff *skb)
+{
+        return NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL, skb->dst->dev,
+                       xfrm4_output_finish);
+}
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 6b9867717d11..fc0ea38953c4 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -9,9 +9,11 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#include <linux/compiler.h>
 #include <linux/skbuff.h>
 #include <linux/spinlock.h>
 #include <linux/icmpv6.h>
+#include <linux/netfilter_ipv6.h>
 #include <net/dsfield.h>
 #include <net/inet_ecn.h>
 #include <net/ipv6.h>
@@ -92,7 +94,7 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb)
         return ret;
 }
 
-int xfrm6_output(struct sk_buff *skb)
+static int xfrm6_output_one(struct sk_buff *skb)
 {
         struct dst_entry *dst = skb->dst;
         struct xfrm_state *x = dst->xfrm;
@@ -110,29 +112,34 @@ int xfrm6_output(struct sk_buff *skb)
                         goto error_nolock;
         }
 
-        spin_lock_bh(&x->lock);
-        err = xfrm_state_check(x, skb);
-        if (err)
-                goto error;
+        do {
+                spin_lock_bh(&x->lock);
+                err = xfrm_state_check(x, skb);
+                if (err)
+                        goto error;
 
-        xfrm6_encap(skb);
+                xfrm6_encap(skb);
 
-        err = x->type->output(x, skb);
-        if (err)
-                goto error;
+                err = x->type->output(x, skb);
+                if (err)
+                        goto error;
 
-        x->curlft.bytes += skb->len;
-        x->curlft.packets++;
+                x->curlft.bytes += skb->len;
+                x->curlft.packets++;
 
-        spin_unlock_bh(&x->lock);
+                spin_unlock_bh(&x->lock);
 
-        skb->nh.raw = skb->data;
-        
-        if (!(skb->dst = dst_pop(dst))) {
-                err = -EHOSTUNREACH;
-                goto error_nolock;
-        }
-        err = NET_XMIT_BYPASS;
+                skb->nh.raw = skb->data;
+                
+                if (!(skb->dst = dst_pop(dst))) {
+                        err = -EHOSTUNREACH;
+                        goto error_nolock;
+                }
+                dst = skb->dst;
+                x = dst->xfrm;
+        } while (x && !x->props.mode);
+
+        err = 0;
 
 out_exit:
         return err;
@@ -142,3 +149,33 @@ error_nolock:
         kfree_skb(skb);
         goto out_exit;
 }
+
+static int xfrm6_output_finish(struct sk_buff *skb)
+{
+        int err;
+
+        while (likely((err = xfrm6_output_one(skb)) == 0)) {
+                nf_reset(skb);
+        
+                err = nf_hook(PF_INET6, NF_IP6_LOCAL_OUT, &skb, NULL,
+                              skb->dst->dev, dst_output);
+                if (unlikely(err != 1))
+                        break;
+
+                if (!skb->dst->xfrm)
+                        return dst_output(skb);
+
+                err = nf_hook(PF_INET6, NF_IP6_POST_ROUTING, &skb, NULL,
+                              skb->dst->dev, xfrm6_output_finish);
+                if (unlikely(err != 1))
+                        break;
+        }
+
+        return err;
+}
+
+int xfrm6_output(struct sk_buff *skb)
+{
+        return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev,
+                       xfrm6_output_finish);
+}