Factor common SNAT code into new functions.

[sliver-openvswitch.git] / datapath / nx_act_snat.c

diff --git a/datapath/nx_act_snat.c b/datapath/nx_act_snat.c
index 5ff8fed..95b8c28 100644 (file)
--- a/datapath/nx_act_snat.c
+++ b/datapath/nx_act_snat.c
@@ -141,13 +141,36 @@ dnat_mac(struct net_bridge_port *p, struct sk_buff *skb)
        return 0;
 }
 
+static int
+__snat_this_address(struct snat_conf *sc, u32 ip_addr)
+{
+       if (sc) {
+               u32 h_ip_addr = ntohl(ip_addr);
+               return (h_ip_addr >= sc->ip_addr_start &&
+                       h_ip_addr <= sc->ip_addr_end);
+       }
+       return 0;
+}
+
+static int
+snat_this_address(struct net_bridge_port *p, u32 ip_addr)
+{
+       unsigned long int flags;
+       int retval;
+
+       spin_lock_irqsave(&p->lock, flags);
+       retval = __snat_this_address(p->snat, ip_addr);
+       spin_unlock_irqrestore(&p->lock, flags);
+
+       return retval;
+}
+
 static int
 snat_pre_route_finish(struct sk_buff *skb)
 {
        struct net_bridge_port *p = skb->dev->br_port;
        struct snat_conf *sc;
        struct iphdr *iph = ip_hdr(skb);
-       uint32_t ip_addr;
        unsigned long flags;
 
        skb->dst = (struct dst_entry *)&__fake_rtable;
@@ -156,9 +179,7 @@ snat_pre_route_finish(struct sk_buff *skb)
        /* Don't process packets that were not translated due to NAT */
        spin_lock_irqsave(&p->lock, flags);
        sc = p->snat;
-       ip_addr = ntohl(iph->daddr);
-       if (sc && (ip_addr >= sc->ip_addr_start) 
-                       && (ip_addr <= sc->ip_addr_end)) {
+       if (__snat_this_address(sc, iph->daddr)) {
                spin_unlock_irqrestore(&p->lock, flags);
                return -1;
        }
@@ -183,9 +204,6 @@ handle_arp_snat(struct sk_buff *skb)
 {
        struct net_bridge_port *p = skb->dev->br_port;
        struct ip_arphdr *ah = (struct ip_arphdr *)arp_hdr(skb);
-       uint32_t ip_addr;
-       unsigned long flags;
-       struct snat_conf *sc;
 
        if ((ah->ar_op != htons(ARPOP_REQUEST)) 
                        || ah->ar_hln != ETH_ALEN
@@ -193,17 +211,10 @@ handle_arp_snat(struct sk_buff *skb)
                        || ah->ar_pln != 4)
                return 0;
 
-       ip_addr = ntohl(ah->ar_tip);
-       spin_lock_irqsave(&p->lock, flags);
-       sc = p->snat;
-
        /* We're only interested in addresses we rewrite. */
-       if (!sc || (sc && ((ip_addr < sc->ip_addr_start) 
-                       || (ip_addr > sc->ip_addr_end)))) {
-               spin_unlock_irqrestore(&p->lock, flags);
+       if (!snat_this_address(p, ah->ar_tip)) {
                return 0;
        }
-       spin_unlock_irqrestore(&p->lock, flags);
 
        arp_send(ARPOP_REPLY, ETH_P_ARP, ah->ar_sip, skb->dev, ah->ar_tip, 
                         ah->ar_sha, p->dp->netdev->dev_addr, ah->ar_sha);
@@ -220,29 +231,18 @@ static int
 handle_icmp_snat(struct sk_buff *skb)
 {
        struct net_bridge_port *p = skb->dev->br_port;
-       struct snat_conf *sc;
        struct ethhdr *eh;
        struct iphdr *iph = ip_hdr(skb);
-       uint32_t ip_addr;
        struct icmphdr *icmph;
        unsigned int datalen;
        uint8_t tmp_eth[ETH_ALEN];
        uint32_t tmp_ip;
        struct sk_buff *nskb;
-       unsigned long flags;
-
-
-       ip_addr = ntohl(iph->daddr);
-       spin_lock_irqsave(&p->lock, flags);
-       sc = p->snat;
 
        /* We're only interested in addresses we rewrite. */
-       if (!sc || (sc && ((ip_addr < sc->ip_addr_start) 
-                       || (ip_addr > sc->ip_addr_end)))) {
-               spin_unlock_irqrestore(&p->lock, flags);
+       if (!snat_this_address(p, iph->daddr)) {
                return 0;
        }
-       spin_unlock_irqrestore(&p->lock, flags);
 
        icmph = (struct icmphdr *) ((u_int32_t *)iph + iph->ihl);
        datalen = skb->len - iph->ihl * 4;