netns: ipmr: declare reg_vif_num per-namespace

Preliminary work to make IPv4 multicast routing netns-aware.

Declare variable 'reg_vif_num' per-namespace, move into struct netns_ipv4.

At the moment, this variable is only referenced in init_net.

Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 10 deletions

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index d6a28acc0683..346e67b50d6c 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -197,14 +197,12 @@ failure:
 
 #ifdef CONFIG_IP_PIMSM
 
-static int reg_vif_num = -1;
-
 static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
 {
         read_lock(&mrt_lock);
         dev->stats.tx_bytes += skb->len;
         dev->stats.tx_packets++;
-        ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT);
+        ipmr_cache_report(skb, init_net.ipv4.mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
         read_unlock(&mrt_lock);
         kfree_skb(skb);
         return 0;
@@ -292,8 +290,8 @@ static int vif_delete(int vifi, int notify)
         }
 
 #ifdef CONFIG_IP_PIMSM
-        if (vifi == reg_vif_num)
-                reg_vif_num = -1;
+        if (vifi == init_net.ipv4.mroute_reg_vif_num)
+                init_net.ipv4.mroute_reg_vif_num = -1;
 #endif
 
         if (vifi+1 == init_net.ipv4.maxvif) {
@@ -439,7 +437,7 @@ static int vif_add(struct vifctl *vifc, int mrtsock)
                  * Special Purpose VIF in PIM
                  * All the packets will be sent to the daemon
                  */
-                if (reg_vif_num >= 0)
+                if (init_net.ipv4.mroute_reg_vif_num >= 0)
                         return -EADDRINUSE;
                 dev = ipmr_reg_vif();
                 if (!dev)
@@ -505,7 +503,7 @@ static int vif_add(struct vifctl *vifc, int mrtsock)
         v->dev = dev;
 #ifdef CONFIG_IP_PIMSM
         if (v->flags&VIFF_REGISTER)
-                reg_vif_num = vifi;
+                init_net.ipv4.mroute_reg_vif_num = vifi;
 #endif
         if (vifi+1 > init_net.ipv4.maxvif)
                 init_net.ipv4.maxvif = vifi+1;
@@ -623,7 +621,7 @@ static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
                 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
                 msg->im_msgtype = IGMPMSG_WHOLEPKT;
                 msg->im_mbz = 0;
-                msg->im_vif = reg_vif_num;
+                msg->im_vif = init_net.ipv4.mroute_reg_vif_num;
                 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
                 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
                                              sizeof(struct iphdr));
@@ -1506,8 +1504,8 @@ static int __pim_rcv(struct sk_buff *skb, unsigned int pimlen)
                 return 1;
 
         read_lock(&mrt_lock);
-        if (reg_vif_num >= 0)
-                reg_dev = init_net.ipv4.vif_table[reg_vif_num].dev;
+        if (init_net.ipv4.mroute_reg_vif_num >= 0)
+                reg_dev = init_net.ipv4.vif_table[init_net.ipv4.mroute_reg_vif_num].dev;
         if (reg_dev)
                 dev_hold(reg_dev);
         read_unlock(&mrt_lock);
@@ -1940,6 +1938,10 @@ static int __net_init ipmr_net_init(struct net *net)
                 err = -ENOMEM;
                 goto fail_mfc_cache;
         }
+
+#ifdef CONFIG_IP_PIMSM
+        net->ipv4.mroute_reg_vif_num = -1;
+#endif
         return 0;
 
 fail_mfc_cache: