[NET]: Make core networking code use seq_open_private

This concerns the ipv4 and ipv6 code mostly, but also the netlink
and unix sockets.

The netlink code is an example of how to use the __seq_open_private()
call - it saves the net namespace on this private.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

15 files changed, 37 insertions, 335 deletions

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index d8248198bcd7..36d6798947b5 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1378,24 +1378,8 @@ static const struct seq_operations arp_seq_ops = {
 
 static int arp_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct neigh_seq_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &arp_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq          = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &arp_seq_ops,
+                        sizeof(struct neigh_seq_state));
 }
 
 static const struct file_operations arp_seq_fops = {
diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index 9fafbeea8fe6..527a6e0af5b6 100644
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -1039,24 +1039,8 @@ static const struct seq_operations fib_seq_ops = {
 
 static int fib_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct fib_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &fib_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq          = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &fib_seq_ops,
+                        sizeof(struct fib_iter_state));
 }
 
 static const struct file_operations fib_seq_fops = {
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index be34bd556d58..81a8285d6d6a 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -2379,25 +2379,8 @@ static const struct seq_operations fib_trie_seq_ops = {
 
 static int fib_trie_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct fib_trie_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &fib_trie_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq          = file->private_data;
-        seq->private = s;
-        memset(s, 0, sizeof(*s));
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &fib_trie_seq_ops,
+                        sizeof(struct fib_trie_iter));
 }
 
 static const struct file_operations fib_trie_fops = {
@@ -2500,25 +2483,8 @@ static const struct seq_operations fib_route_seq_ops = {
 
 static int fib_route_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct fib_trie_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &fib_route_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq          = file->private_data;
-        seq->private = s;
-        memset(s, 0, sizeof(*s));
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &fib_route_seq_ops,
+                        sizeof(struct fib_trie_iter));
 }
 
 static const struct file_operations fib_route_fops = {
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 2b6e59c4c0d0..7dbc282d4f9f 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -2410,23 +2410,8 @@ static const struct seq_operations igmp_mc_seq_ops = {
 
 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-        rc = seq_open(file, &igmp_mc_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &igmp_mc_seq_ops,
+                        sizeof(struct igmp_mc_iter_state));
 }
 
 static const struct file_operations igmp_mc_seq_fops = {
@@ -2584,23 +2569,8 @@ static const struct seq_operations igmp_mcf_seq_ops = {
 
 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-        rc = seq_open(file, &igmp_mcf_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &igmp_mcf_seq_ops,
+                        sizeof(struct igmp_mcf_iter_state));
 }
 
 static const struct file_operations igmp_mcf_seq_fops = {
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index b8b4b497fb57..37bb497d92af 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1714,26 +1714,8 @@ static const struct seq_operations ipmr_vif_seq_ops = {
 
 static int ipmr_vif_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &ipmr_vif_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        s->ct = 0;
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
-
+        return seq_open_private(file, &ipmr_vif_seq_ops,
+                        sizeof(struct ipmr_vif_iter));
 }
 
 static const struct file_operations ipmr_vif_fops = {
@@ -1877,25 +1859,8 @@ static const struct seq_operations ipmr_mfc_seq_ops = {
 
 static int ipmr_mfc_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &ipmr_mfc_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
-
+        return seq_open_private(file, &ipmr_mfc_seq_ops,
+                        sizeof(struct ipmr_mfc_iter));
 }
 
 static const struct file_operations ipmr_mfc_fops = {
diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c
index 61d023d58b5d..7345fc252a23 100644
--- a/net/ipv4/ipvs/ip_vs_ctl.c
+++ b/net/ipv4/ipvs/ip_vs_ctl.c
@@ -1792,24 +1792,8 @@ static const struct seq_operations ip_vs_info_seq_ops = {
 
 static int ip_vs_info_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct ip_vs_iter *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &ip_vs_info_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq          = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &ip_vs_info_seq_ops,
+                        sizeof(struct ip_vs_iter));
 }
 
 static const struct file_operations ip_vs_info_fops = {
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 07070c7067f3..3916faca3afe 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -902,24 +902,8 @@ static const struct seq_operations raw_seq_ops = {
 
 static int raw_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct raw_iter_state *s;
-
-        s = kzalloc(sizeof(*s), GFP_KERNEL);
-        if (!s)
-                goto out;
-        rc = seq_open(file, &raw_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &raw_seq_ops,
+                        sizeof(struct raw_iter_state));
 }
 
 static const struct file_operations raw_seq_fops = {
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 307e1f1107ca..21b12de9e653 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -375,23 +375,8 @@ static const struct seq_operations rt_cache_seq_ops = {
 
 static int rt_cache_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct rt_cache_iter_state *s;
-
-        s = kzalloc(sizeof(*s), GFP_KERNEL);
-        if (!s)
-                goto out;
-        rc = seq_open(file, &rt_cache_seq_ops);
-        if (rc)
-                goto out_kfree;
-        seq          = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &rt_cache_seq_ops,
+                        sizeof(struct rt_cache_iter_state));
 }
 
 static const struct file_operations rt_cache_seq_fops = {
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 6d5c3c299148..8b2d760ddf26 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2806,24 +2806,8 @@ static const struct seq_operations if6_seq_ops = {
 
 static int if6_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &if6_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &if6_seq_ops,
+                        sizeof(struct if6_iter_state));
 }
 
 static const struct file_operations if6_fops = {
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 5810852c558a..f915c4df9820 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -549,24 +549,8 @@ static const struct seq_operations ac6_seq_ops = {
 
 static int ac6_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct ac6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &ac6_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &ac6_seq_ops,
+                        sizeof(struct ac6_iter_state));
 }
 
 static const struct file_operations ac6_seq_fops = {
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 1791399c7f10..217d60f9fc80 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -658,24 +658,8 @@ static const struct seq_operations ip6fl_seq_ops = {
 
 static int ip6fl_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct ip6fl_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &ip6fl_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &ip6fl_seq_ops,
+                        sizeof(struct ip6fl_iter_state));
 }
 
 static const struct file_operations ip6fl_seq_fops = {
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index cc8d4e2a9531..331d728c2035 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -2426,24 +2426,8 @@ static const struct seq_operations igmp6_mc_seq_ops = {
 
 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &igmp6_mc_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &igmp6_mc_seq_ops,
+                        sizeof(struct igmp6_mc_iter_state));
 }
 
 static const struct file_operations igmp6_mc_seq_fops = {
@@ -2600,24 +2584,8 @@ static const struct seq_operations igmp6_mcf_seq_ops = {
 
 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-
-        if (!s)
-                goto out;
-
-        rc = seq_open(file, &igmp6_mcf_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &igmp6_mcf_seq_ops,
+                        sizeof(struct igmp6_mcf_iter_state));
 }
 
 static const struct file_operations igmp6_mcf_seq_fops = {
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index bdd0974e6775..ca24ef19cd8f 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1289,21 +1289,8 @@ static const struct seq_operations raw6_seq_ops = {
 
 static int raw6_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        struct raw6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
-        if (!s)
-                goto out;
-        rc = seq_open(file, &raw6_seq_ops);
-        if (rc)
-                goto out_kfree;
-        seq = file->private_data;
-        seq->private = s;
-out:
-        return rc;
-out_kfree:
-        kfree(s);
-        goto out;
+        return seq_open_private(file, &raw6_seq_ops,
+                        sizeof(struct raw6_iter_state));
 }
 
 static const struct file_operations raw6_seq_fops = {
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 3ef32825da71..f934f54fbfd5 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1845,27 +1845,18 @@ static const struct seq_operations netlink_seq_ops = {
 
 static int netlink_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
         struct nl_seq_iter *iter;
-        int err;
 
-        iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+        iter = __seq_open_private(file, &netlink_seq_ops, sizeof(*iter));
         if (!iter)
                 return -ENOMEM;
 
-        err = seq_open(file, &netlink_seq_ops);
-        if (err) {
-                kfree(iter);
-                return err;
-        }
-
-        seq = file->private_data;
-        seq->private = iter;
         iter->net = get_proc_net(inode);
         if (!iter->net) {
                 seq_release_private(inode, file);
                 return -ENXIO;
         }
+
         return 0;
 }
 
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 10e73122c34c..2b57eaf66abc 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2086,25 +2086,7 @@ static const struct seq_operations unix_seq_ops = {
 
 static int unix_seq_open(struct inode *inode, struct file *file)
 {
-        struct seq_file *seq;
-        int rc = -ENOMEM;
-        int *iter = kmalloc(sizeof(int), GFP_KERNEL);
-
-        if (!iter)
-                goto out;
-
-        rc = seq_open(file, &unix_seq_ops);
-        if (rc)
-                goto out_kfree;
-
-        seq          = file->private_data;
-        seq->private = iter;
-        *iter = 0;
-out:
-        return rc;
-out_kfree:
-        kfree(iter);
-        goto out;
+        return seq_open_private(file, &unix_seq_ops, sizeof(int));
 }
 
 static const struct file_operations unix_seq_fops = {