Merge tag 'for-v3.18' of git://git.infradead.org/battery-2.6

[cascardo/linux.git] / include / linux / netfilter_bridge.h

diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
index 8ab1c27..c755e49 100644 (file)
--- a/include/linux/netfilter_bridge.h
+++ b/include/linux/netfilter_bridge.h
@@ -15,7 +15,7 @@ enum nf_br_hook_priorities {
        NF_BR_PRI_LAST = INT_MAX,
 };
 
-#ifdef CONFIG_BRIDGE_NETFILTER
+#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 
 #define BRNF_PKT_TYPE                  0x01
 #define BRNF_BRIDGED_DNAT              0x02
@@ -24,16 +24,6 @@ enum nf_br_hook_priorities {
 #define BRNF_8021Q                     0x10
 #define BRNF_PPPoE                     0x20
 
-/* Only used in br_forward.c */
-int nf_bridge_copy_header(struct sk_buff *skb);
-static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
-{
-       if (skb->nf_bridge &&
-           skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
-               return nf_bridge_copy_header(skb);
-       return 0;
-}
-
 static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
 {
        switch (skb->protocol) {
@@ -46,6 +36,44 @@ static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
        }
 }
 
+static inline void nf_bridge_update_protocol(struct sk_buff *skb)
+{
+       if (skb->nf_bridge->mask & BRNF_8021Q)
+               skb->protocol = htons(ETH_P_8021Q);
+       else if (skb->nf_bridge->mask & BRNF_PPPoE)
+               skb->protocol = htons(ETH_P_PPP_SES);
+}
+
+/* Fill in the header for fragmented IP packets handled by
+ * the IPv4 connection tracking code.
+ *
+ * Only used in br_forward.c
+ */
+static inline int nf_bridge_copy_header(struct sk_buff *skb)
+{
+       int err;
+       unsigned int header_size;
+
+       nf_bridge_update_protocol(skb);
+       header_size = ETH_HLEN + nf_bridge_encap_header_len(skb);
+       err = skb_cow_head(skb, header_size);
+       if (err)
+               return err;
+
+       skb_copy_to_linear_data_offset(skb, -header_size,
+                                      skb->nf_bridge->data, header_size);
+       __skb_push(skb, nf_bridge_encap_header_len(skb));
+       return 0;
+}
+
+static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
+{
+       if (skb->nf_bridge &&
+           skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
+               return nf_bridge_copy_header(skb);
+       return 0;
+}
+
 static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
 {
        if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))