[IPV6]: Consolidate common SNMP code

This patch moves the non-proc SNMP code into addrconf.c and reuses
IPv4 SNMP code where applicable.

As a result we can skip proc.o if /proc is disabled.

Note that I've made a number of functions static since they're only
used by addrconf.c for now.  If they ever get used elsewhere we can
always remove the static.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 79 insertions, 139 deletions

diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index e9478688c3d3..0acf64dc5775 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -7,7 +7,7 @@ obj-$(CONFIG_IPV6) += ipv6.o
 ipv6-objs :=    af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
                 route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o udplite.o \
                 raw.o protocol.o icmp.o mcast.o reassembly.o tcp_ipv6.o \
-                exthdrs.o sysctl_net_ipv6.o datagram.o proc.o \
+                exthdrs.o sysctl_net_ipv6.o datagram.o \
                 ip6_flowlabel.o inet6_connection_sock.o
 
 ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
@@ -28,6 +28,7 @@ obj-$(CONFIG_INET6_XFRM_MODE_TUNNEL) += xfrm6_mode_tunnel.o
 obj-$(CONFIG_INET6_XFRM_MODE_ROUTEOPTIMIZATION) += xfrm6_mode_ro.o
 obj-$(CONFIG_INET6_XFRM_MODE_BEET) += xfrm6_mode_beet.o
 obj-$(CONFIG_NETFILTER) += netfilter/
+obj-$(CONFIG_PROC_FS) += proc.o
 
 obj-$(CONFIG_IPV6_SIT) += sit.o
 obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 33ccc95c349b..ea86bf4bfe0a 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -81,6 +81,7 @@
 #endif
 
 #include <asm/uaccess.h>
+#include <asm/unaligned.h>
 
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
@@ -246,6 +247,37 @@ static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
         add_timer(&ifp->timer);
 }
 
+static int snmp6_alloc_dev(struct inet6_dev *idev)
+{
+        int err = -ENOMEM;
+
+        if (!idev || !idev->dev)
+                return -EINVAL;
+
+        if (snmp_mib_init((void **)idev->stats.ipv6,
+                          sizeof(struct ipstats_mib),
+                          __alignof__(struct ipstats_mib)) < 0)
+                goto err_ip;
+        if (snmp_mib_init((void **)idev->stats.icmpv6,
+                          sizeof(struct icmpv6_mib),
+                          __alignof__(struct icmpv6_mib)) < 0)
+                goto err_icmp;
+
+        return 0;
+
+err_icmp:
+        snmp_mib_free((void **)idev->stats.ipv6);
+err_ip:
+        return err;
+}
+
+static int snmp6_free_dev(struct inet6_dev *idev)
+{
+        snmp_mib_free((void **)idev->stats.icmpv6);
+        snmp_mib_free((void **)idev->stats.ipv6);
+        return 0;
+}
+
 /* Nobody refers to this device, we may destroy it. */
 
 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
@@ -3438,6 +3470,34 @@ static inline size_t inet6_if_nlmsg_size(void)
                  );
 }
 
+static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
+                                      int bytes)
+{
+        int i;
+        int pad = bytes - sizeof(u64) * items;
+        BUG_ON(pad < 0);
+
+        /* Use put_unaligned() because stats may not be aligned for u64. */
+        put_unaligned(items, &stats[0]);
+        for (i = 1; i < items; i++)
+                put_unaligned(snmp_fold_field(mib, i), &stats[i]);
+
+        memset(&stats[items], 0, pad);
+}
+
+static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
+                             int bytes)
+{
+        switch(attrtype) {
+        case IFLA_INET6_STATS:
+                __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
+                break;
+        case IFLA_INET6_ICMP6STATS:
+                __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
+                break;
+        }
+}
+
 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
                              u32 pid, u32 seq, int event, unsigned int flags)
 {
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 825d03e87ae0..18cb928c8d92 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -714,26 +714,26 @@ EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
 
 static int __init init_ipv6_mibs(void)
 {
-        if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
-                           __alignof__(struct ipstats_mib)) < 0)
+        if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
+                          __alignof__(struct ipstats_mib)) < 0)
                 goto err_ip_mib;
-        if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
-                           __alignof__(struct icmpv6_mib)) < 0)
+        if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
+                          __alignof__(struct icmpv6_mib)) < 0)
                 goto err_icmp_mib;
-        if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
-                           __alignof__(struct udp_mib)) < 0)
+        if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
+                          __alignof__(struct udp_mib)) < 0)
                 goto err_udp_mib;
-        if (snmp6_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
-                           __alignof__(struct udp_mib)) < 0)
+        if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
+                          __alignof__(struct udp_mib)) < 0)
                 goto err_udplite_mib;
         return 0;
 
 err_udplite_mib:
-        snmp6_mib_free((void **)udp_stats_in6);
+        snmp_mib_free((void **)udp_stats_in6);
 err_udp_mib:
-        snmp6_mib_free((void **)icmpv6_statistics);
+        snmp_mib_free((void **)icmpv6_statistics);
 err_icmp_mib:
-        snmp6_mib_free((void **)ipv6_statistics);
+        snmp_mib_free((void **)ipv6_statistics);
 err_ip_mib:
         return -ENOMEM;
 
@@ -741,10 +741,10 @@ err_ip_mib:
 
 static void cleanup_ipv6_mibs(void)
 {
-        snmp6_mib_free((void **)ipv6_statistics);
-        snmp6_mib_free((void **)icmpv6_statistics);
-        snmp6_mib_free((void **)udp_stats_in6);
-        snmp6_mib_free((void **)udplite_stats_in6);
+        snmp_mib_free((void **)ipv6_statistics);
+        snmp_mib_free((void **)icmpv6_statistics);
+        snmp_mib_free((void **)udp_stats_in6);
+        snmp_mib_free((void **)udplite_stats_in6);
 }
 
 static int __init inet6_init(void)
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 7a00bedb6b93..acb306a5dd56 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -23,13 +23,12 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/stddef.h>
-#include <asm/unaligned.h>
+#include <net/ip.h>
 #include <net/sock.h>
 #include <net/tcp.h>
 #include <net/transp_v6.h>
 #include <net/ipv6.h>
 
-#ifdef CONFIG_PROC_FS
 static struct proc_dir_entry *proc_net_devsnmp6;
 
 static int fold_prot_inuse(struct proto *proto)
@@ -142,29 +141,14 @@ static struct snmp_mib snmp6_udplite6_list[] = {
         SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
         SNMP_MIB_SENTINEL
 };
-#endif  /* CONFIG_PROC_FS */
 
-static unsigned long
-fold_field(void *mib[], int offt)
-{
-        unsigned long res = 0;
-        int i;
-
-        for_each_possible_cpu(i) {
-                res += *(((unsigned long *)per_cpu_ptr(mib[0], i)) + offt);
-                res += *(((unsigned long *)per_cpu_ptr(mib[1], i)) + offt);
-        }
-        return res;
-}
-
-#ifdef CONFIG_PROC_FS
 static inline void
 snmp6_seq_show_item(struct seq_file *seq, void **mib, struct snmp_mib *itemlist)
 {
         int i;
         for (i=0; itemlist[i].name; i++)
                 seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
-                                fold_field(mib, itemlist[i].entry));
+                           snmp_fold_field(mib, itemlist[i].entry));
 }
 
 static int snmp6_seq_show(struct seq_file *seq, void *v)
@@ -209,37 +193,7 @@ static const struct file_operations snmp6_seq_fops = {
         .llseek  = seq_lseek,
         .release = single_release,
 };
-#endif  /* CONFIG_PROC_FS */
 
-static inline void
-__snmp6_fill_stats(u64 *stats, void **mib, int items, int bytes)
-{
-        int i;
-        int pad = bytes - sizeof(u64) * items;
-        BUG_ON(pad < 0);
-
-        /* Use put_unaligned() because stats may not be aligned for u64. */
-        put_unaligned(items, &stats[0]);
-        for (i = 1; i < items; i++)
-                put_unaligned(fold_field(mib, i), &stats[i]);
-
-        memset(&stats[items], 0, pad);
-}
-
-void
-snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, int bytes)
-{
-        switch(attrtype) {
-        case IFLA_INET6_STATS:
-                __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
-                break;
-        case IFLA_INET6_ICMP6STATS:
-                __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
-                break;
-        }
-}
-
-#ifdef CONFIG_PROC_FS
 int snmp6_register_dev(struct inet6_dev *idev)
 {
         struct proc_dir_entry *p;
@@ -304,78 +258,3 @@ void ipv6_misc_proc_exit(void)
         proc_net_remove("snmp6");
 }
 
-#else   /* CONFIG_PROC_FS */
-
-
-int snmp6_register_dev(struct inet6_dev *idev)
-{
-        return 0;
-}
-
-int snmp6_unregister_dev(struct inet6_dev *idev)
-{
-        return 0;
-}
-
-#endif  /* CONFIG_PROC_FS */
-
-int snmp6_alloc_dev(struct inet6_dev *idev)
-{
-        int err = -ENOMEM;
-
-        if (!idev || !idev->dev)
-                return -EINVAL;
-
-        if (snmp6_mib_init((void **)idev->stats.ipv6, sizeof(struct ipstats_mib),
-                           __alignof__(struct ipstats_mib)) < 0)
-                goto err_ip;
-        if (snmp6_mib_init((void **)idev->stats.icmpv6, sizeof(struct icmpv6_mib),
-                           __alignof__(struct icmpv6_mib)) < 0)
-                goto err_icmp;
-
-        return 0;
-
-err_icmp:
-        snmp6_mib_free((void **)idev->stats.ipv6);
-err_ip:
-        return err;
-}
-
-int snmp6_free_dev(struct inet6_dev *idev)
-{
-        snmp6_mib_free((void **)idev->stats.icmpv6);
-        snmp6_mib_free((void **)idev->stats.ipv6);
-        return 0;
-}
-
-int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
-{
-        if (ptr == NULL)
-                return -EINVAL;
-
-        ptr[0] = __alloc_percpu(mibsize);
-        if (!ptr[0])
-                goto err0;
-
-        ptr[1] = __alloc_percpu(mibsize);
-        if (!ptr[1])
-                goto err1;
-
-        return 0;
-
-err1:
-        free_percpu(ptr[0]);
-        ptr[0] = NULL;
-err0:
-        return -ENOMEM;
-}
-
-void snmp6_mib_free(void *ptr[2])
-{
-        if (ptr == NULL)
-                return;
-        free_percpu(ptr[0]);
-        free_percpu(ptr[1]);
-        ptr[0] = ptr[1] = NULL;
-}
-