6 files changed, 57 insertions, 25 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 17d67b579beb..b10ff0a71855 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1515,6 +1515,14 @@ static inline bool is_skb_forwardable(struct net_device *dev,
  */
 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
 {
+        if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
+                if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
+                        atomic_long_inc(&dev->rx_dropped);
+                        kfree_skb(skb);
+                        return NET_RX_DROP;
+                }
+        }
+
         skb_orphan(skb);
         nf_reset(skb);
 
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index e7ab0c0285b5..3231b468bb72 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -384,8 +384,8 @@ static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
                  */
                 list_for_each_entry(r, &ops->rules_list, list) {
                         if (r->action == FR_ACT_GOTO &&
-                            r->target == rule->pref) {
-                                BUG_ON(rtnl_dereference(r->ctarget) != NULL);
+                            r->target == rule->pref &&
+                            rtnl_dereference(r->ctarget) == NULL) {
                                 rcu_assign_pointer(r->ctarget, rule);
                                 if (--ops->unresolved_rules == 0)
                                         break;
diff --git a/net/core/flow.c b/net/core/flow.c
index bf32c33cad3b..555a456efb07 100644
--- a/net/core/flow.c
+++ b/net/core/flow.c
@@ -30,6 +30,7 @@ struct flow_cache_entry {
                 struct hlist_node       hlist;
                 struct list_head        gc_list;
         } u;
+        struct net                      *net;
         u16                             family;
         u8                              dir;
         u32                             genid;
@@ -172,29 +173,26 @@ static void flow_new_hash_rnd(struct flow_cache *fc,
 
 static u32 flow_hash_code(struct flow_cache *fc,
                           struct flow_cache_percpu *fcp,
-                          const struct flowi *key)
+                          const struct flowi *key,
+                          size_t keysize)
 {
         const u32 *k = (const u32 *) key;
+        const u32 length = keysize * sizeof(flow_compare_t) / sizeof(u32);
 
-        return jhash2(k, (sizeof(*key) / sizeof(u32)), fcp->hash_rnd)
+        return jhash2(k, length, fcp->hash_rnd)
                 & (flow_cache_hash_size(fc) - 1);
 }
 
-typedef unsigned long flow_compare_t;
-
 /* I hear what you're saying, use memcmp.  But memcmp cannot make
- * important assumptions that we can here, such as alignment and
- * constant size.
+ * important assumptions that we can here, such as alignment.
  */
-static int flow_key_compare(const struct flowi *key1, const struct flowi *key2)
+static int flow_key_compare(const struct flowi *key1, const struct flowi *key2,
+                            size_t keysize)
 {
         const flow_compare_t *k1, *k1_lim, *k2;
-        const int n_elem = sizeof(struct flowi) / sizeof(flow_compare_t);
-
-        BUILD_BUG_ON(sizeof(struct flowi) % sizeof(flow_compare_t));
 
         k1 = (const flow_compare_t *) key1;
-        k1_lim = k1 + n_elem;
+        k1_lim = k1 + keysize;
 
         k2 = (const flow_compare_t *) key2;
 
@@ -215,6 +213,7 @@ flow_cache_lookup(struct net *net, const struct flowi *key, u16 family, u8 dir,
         struct flow_cache_entry *fle, *tfle;
         struct hlist_node *entry;
         struct flow_cache_object *flo;
+        size_t keysize;
         unsigned int hash;
 
         local_bh_disable();
@@ -222,6 +221,11 @@ flow_cache_lookup(struct net *net, const struct flowi *key, u16 family, u8 dir,
 
         fle = NULL;
         flo = NULL;
+
+        keysize = flow_key_size(family);
+        if (!keysize)
+                goto nocache;
+
         /* Packet really early in init?  Making flow_cache_init a
          * pre-smp initcall would solve this.  --RR */
         if (!fcp->hash_table)
@@ -230,11 +234,12 @@ flow_cache_lookup(struct net *net, const struct flowi *key, u16 family, u8 dir,
         if (fcp->hash_rnd_recalc)
                 flow_new_hash_rnd(fc, fcp);
 
-        hash = flow_hash_code(fc, fcp, key);
+        hash = flow_hash_code(fc, fcp, key, keysize);
         hlist_for_each_entry(tfle, entry, &fcp->hash_table[hash], u.hlist) {
-                if (tfle->family == family &&
+                if (tfle->net == net &&
+                    tfle->family == family &&
                     tfle->dir == dir &&
-                    flow_key_compare(key, &tfle->key) == 0) {
+                    flow_key_compare(key, &tfle->key, keysize) == 0) {
                         fle = tfle;
                         break;
                 }
@@ -246,9 +251,10 @@ flow_cache_lookup(struct net *net, const struct flowi *key, u16 family, u8 dir,
 
                 fle = kmem_cache_alloc(flow_cachep, GFP_ATOMIC);
                 if (fle) {
+                        fle->net = net;
                         fle->family = family;
                         fle->dir = dir;
-                        memcpy(&fle->key, key, sizeof(*key));
+                        memcpy(&fle->key, key, keysize * sizeof(flow_compare_t));
                         fle->object = NULL;
                         hlist_add_head(&fle->u.hlist, &fcp->hash_table[hash]);
                         fcp->hash_count++;
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 8fab9b0bb203..1334d7e56f02 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1319,11 +1319,15 @@ static void neigh_proxy_process(unsigned long arg)
 
                 if (tdif <= 0) {
                         struct net_device *dev = skb->dev;
+
                         __skb_unlink(skb, &tbl->proxy_queue);
-                        if (tbl->proxy_redo && netif_running(dev))
+                        if (tbl->proxy_redo && netif_running(dev)) {
+                                rcu_read_lock();
                                 tbl->proxy_redo(skb);
-                        else
+                                rcu_read_unlock();
+                        } else {
                                 kfree_skb(skb);
+                        }
 
                         dev_put(dev);
                 } else if (!sched_next || tdif < sched_next)
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index adf84dd8c7b5..52622517e0d8 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -558,13 +558,14 @@ int __netpoll_rx(struct sk_buff *skb)
         if (skb_shared(skb))
                 goto out;
 
-        iph = (struct iphdr *)skb->data;
         if (!pskb_may_pull(skb, sizeof(struct iphdr)))
                 goto out;
+        iph = (struct iphdr *)skb->data;
         if (iph->ihl < 5 || iph->version != 4)
                 goto out;
         if (!pskb_may_pull(skb, iph->ihl*4))
                 goto out;
+        iph = (struct iphdr *)skb->data;
         if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
                 goto out;
 
@@ -579,6 +580,7 @@ int __netpoll_rx(struct sk_buff *skb)
         if (pskb_trim_rcsum(skb, len))
                 goto out;
 
+        iph = (struct iphdr *)skb->data;
         if (iph->protocol != IPPROTO_UDP)
                 goto out;
 
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 27002dffe7ed..387703f56fce 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -611,8 +611,21 @@ struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src)
 }
 EXPORT_SYMBOL_GPL(skb_morph);
 
-/* skb frags copy userspace buffers to kernel */
-static int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
+/*      skb_copy_ubufs  -       copy userspace skb frags buffers to kernel
+ *      @skb: the skb to modify
+ *      @gfp_mask: allocation priority
+ *
+ *      This must be called on SKBTX_DEV_ZEROCOPY skb.
+ *      It will copy all frags into kernel and drop the reference
+ *      to userspace pages.
+ *
+ *      If this function is called from an interrupt gfp_mask() must be
+ *      %GFP_ATOMIC.
+ *
+ *      Returns 0 on success or a negative error code on failure
+ *      to allocate kernel memory to copy to.
+ */
+int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
 {
         int i;
         int num_frags = skb_shinfo(skb)->nr_frags;
@@ -652,6 +665,8 @@ static int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
                 skb_shinfo(skb)->frags[i - 1].page = head;
                 head = (struct page *)head->private;
         }
+
+        skb_shinfo(skb)->tx_flags &= ~SKBTX_DEV_ZEROCOPY;
         return 0;
 }
 
@@ -677,7 +692,6 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
         if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
                 if (skb_copy_ubufs(skb, gfp_mask))
                         return NULL;
-                skb_shinfo(skb)->tx_flags &= ~SKBTX_DEV_ZEROCOPY;
         }
 
         n = skb + 1;
@@ -803,7 +817,6 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
                                 n = NULL;
                                 goto out;
                         }
-                        skb_shinfo(skb)->tx_flags &= ~SKBTX_DEV_ZEROCOPY;
                 }
                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                         skb_shinfo(n)->frags[i] = skb_shinfo(skb)->frags[i];
@@ -896,7 +909,6 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
                 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
                         if (skb_copy_ubufs(skb, gfp_mask))
                                 goto nofrags;
-                        skb_shinfo(skb)->tx_flags &= ~SKBTX_DEV_ZEROCOPY;
                 }
                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
                         get_page(skb_shinfo(skb)->frags[i].page);