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>

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 8451722..2eb3814 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -63,6 +63,9 @@ struct netns_ipv4 {
        atomic_t                cache_resolve_queue_len;
        int                     mroute_do_assert;
        int                     mroute_do_pim;
+#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
+       int                     mroute_reg_vif_num;
+#endif
 #endif
 };
 #endif

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index d6a28ac..346e67b 100644 (file)
--- 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: