multicast: do not restore deleted record source filter mode to new one

[linux-2.6-microblaze.git] / net / ipv4 / igmp.c

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 85b617b..28fef7d 100644 (file)
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1200,13 +1200,13 @@ static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
        spin_lock_bh(&im->lock);
        if (pmc) {
                im->interface = pmc->interface;
-               im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
-               im->sfmode = pmc->sfmode;
-               if (pmc->sfmode == MCAST_INCLUDE) {
+               if (im->sfmode == MCAST_INCLUDE) {
                        im->tomb = pmc->tomb;
                        im->sources = pmc->sources;
                        for (psf = im->sources; psf; psf = psf->sf_next)
-                               psf->sf_crcount = im->crcount;
+                               psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
+               } else {
+                       im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
                }
                in_dev_put(pmc->interface);
                kfree(pmc);
@@ -1288,7 +1288,7 @@ static void igmp_group_dropped(struct ip_mc_list *im)
 #endif
 }
 
-static void igmp_group_added(struct ip_mc_list *im)
+static void igmp_group_added(struct ip_mc_list *im, unsigned int mode)
 {
        struct in_device *in_dev = im->interface;
 #ifdef CONFIG_IP_MULTICAST
@@ -1316,7 +1316,13 @@ static void igmp_group_added(struct ip_mc_list *im)
        }
        /* else, v3 */
 
-       im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
+       /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should
+        * not send filter-mode change record as the mode should be from
+        * IN() to IN(A).
+        */
+       if (mode == MCAST_EXCLUDE)
+               im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
+
        igmp_ifc_event(in_dev);
 #endif
 }
@@ -1381,8 +1387,7 @@ static void ip_mc_hash_remove(struct in_device *in_dev,
 /*
  *     A socket has joined a multicast group on device dev.
  */
-
-void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
+void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, unsigned int mode)
 {
        struct ip_mc_list *im;
 #ifdef CONFIG_IP_MULTICAST
@@ -1394,7 +1399,7 @@ void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
        for_each_pmc_rtnl(in_dev, im) {
                if (im->multiaddr == addr) {
                        im->users++;
-                       ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
+                       ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0);
                        goto out;
                }
        }
@@ -1408,8 +1413,8 @@ void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
        in_dev_hold(in_dev);
        im->multiaddr = addr;
        /* initial mode is (EX, empty) */
-       im->sfmode = MCAST_EXCLUDE;
-       im->sfcount[MCAST_EXCLUDE] = 1;
+       im->sfmode = mode;
+       im->sfcount[mode] = 1;
        refcount_set(&im->refcnt, 1);
        spin_lock_init(&im->lock);
 #ifdef CONFIG_IP_MULTICAST
@@ -1426,12 +1431,17 @@ void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
 #ifdef CONFIG_IP_MULTICAST
        igmpv3_del_delrec(in_dev, im);
 #endif
-       igmp_group_added(im);
+       igmp_group_added(im, mode);
        if (!in_dev->dead)
                ip_rt_multicast_event(in_dev);
 out:
        return;
 }
+
+void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
+{
+       __ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE);
+}
 EXPORT_SYMBOL(ip_mc_inc_group);
 
 static int ip_mc_check_iphdr(struct sk_buff *skb)
@@ -1688,7 +1698,7 @@ void ip_mc_remap(struct in_device *in_dev)
 #ifdef CONFIG_IP_MULTICAST
                igmpv3_del_delrec(in_dev, pmc);
 #endif
-               igmp_group_added(pmc);
+               igmp_group_added(pmc, pmc->sfmode);
        }
 }
 
@@ -1751,7 +1761,7 @@ void ip_mc_up(struct in_device *in_dev)
 #ifdef CONFIG_IP_MULTICAST
                igmpv3_del_delrec(in_dev, pmc);
 #endif
-               igmp_group_added(pmc);
+               igmp_group_added(pmc, pmc->sfmode);
        }
 }
 
@@ -2130,8 +2140,8 @@ static void ip_mc_clear_src(struct ip_mc_list *pmc)
 
 /* Join a multicast group
  */
-
-int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
+static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
+                             unsigned int mode)
 {
        __be32 addr = imr->imr_multiaddr.s_addr;
        struct ip_mc_socklist *iml, *i;
@@ -2172,15 +2182,30 @@ int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
        memcpy(&iml->multi, imr, sizeof(*imr));
        iml->next_rcu = inet->mc_list;
        iml->sflist = NULL;
-       iml->sfmode = MCAST_EXCLUDE;
+       iml->sfmode = mode;
        rcu_assign_pointer(inet->mc_list, iml);
-       ip_mc_inc_group(in_dev, addr);
+       __ip_mc_inc_group(in_dev, addr, mode);
        err = 0;
 done:
        return err;
 }
+
+/* Join ASM (Any-Source Multicast) group
+ */
+int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
+{
+       return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE);
+}
 EXPORT_SYMBOL(ip_mc_join_group);
 
+/* Join SSM (Source-Specific Multicast) group
+ */
+int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
+                        unsigned int mode)
+{
+       return __ip_mc_join_group(sk, imr, mode);
+}
+
 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
                           struct in_device *in_dev)
 {