[IPV6]: SNMP6 clean-up.

include/net/ipv6.h

@@ -106,6 +106,7 @@ struct frag_hdr {
 /* sysctls */
 extern int sysctl_ipv6_bindv6only;
 
+/* MIBs */
 DECLARE_SNMP_STAT(struct ipv6_mib, ipv6_statistics);
 #define IP6_INC_STATS(field)		SNMP_INC_STATS(ipv6_statistics, field)
 #define IP6_INC_STATS_BH(field)		SNMP_INC_STATS_BH(ipv6_statistics, field)
@@ -114,16 +115,17 @@ DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 #define ICMP6_INC_STATS(field)		SNMP_INC_STATS(icmpv6_statistics, field)
 #define ICMP6_INC_STATS_BH(field)	SNMP_INC_STATS_BH(icmpv6_statistics, field)
 #define ICMP6_INC_STATS_USER(field)	SNMP_INC_STATS_USER(icmpv6_statistics, field)
-#define ICMP6_STATS_PTR_BH(field) 					\
-	(&								\
-	 ((per_cpu_ptr(icmpv6_statistics[0], smp_processor_id()))->	\
-	  field))
+#define ICMP6_INC_STATS_OFFSET_BH(field, offset)	\
+					SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, offset)
 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
 #define UDP6_INC_STATS(field)		SNMP_INC_STATS(udp_stats_in6, field)
 #define UDP6_INC_STATS_BH(field)	SNMP_INC_STATS_BH(udp_stats_in6, field)
 #define UDP6_INC_STATS_USER(field) 	SNMP_INC_STATS_USER(udp_stats_in6, field)
 extern atomic_t			inet6_sock_nr;
 
+int snmp6_mib_init(void *ptr[2], size_t mibsize);
+void snmp6_mib_free(void *ptr[2]);
+
 struct ip6_ra_chain
 {
 	struct ip6_ra_chain	*next;

include/net/snmp.h

@@ -304,6 +304,8 @@ struct linux_mib
 
 #define SNMP_INC_STATS_BH(mib, field) 	\
 	(per_cpu_ptr(mib[0], smp_processor_id())->field++)
+#define SNMP_INC_STATS_OFFSET_BH(mib, field, offset)	\
+	((*((&per_cpu_ptr(mib[0], smp_processor_id())->field) + (offset)))++)
 #define SNMP_INC_STATS_USER(mib, field) \
 	(per_cpu_ptr(mib[1], smp_processor_id())->field++)
 #define SNMP_INC_STATS(mib, field) 	\

net/ipv6/af_inet6.c

@@ -631,79 +631,72 @@ inet6_unregister_protosw(struct inet_protosw *p)
 	inet_unregister_protosw(p);
 }
 
-static int __init init_ipv6_mibs(void)
+int
+snmp6_mib_init(void *ptr[2], size_t mibsize)
 {
 	int i;
 
-	ipv6_statistics[0] = kmalloc_percpu(sizeof (struct ipv6_mib),
-						GFP_KERNEL);
-	if (!ipv6_statistics[0])
-		goto err_ip_mib0;
-	ipv6_statistics[1] = kmalloc_percpu(sizeof (struct ipv6_mib),
-						GFP_KERNEL);
-	if (!ipv6_statistics[1])
-		goto err_ip_mib1;
-	
-	icmpv6_statistics[0] = kmalloc_percpu(sizeof (struct icmpv6_mib),
-						GFP_KERNEL);
-	if (!icmpv6_statistics[0])
-		goto err_icmp_mib0;
-	icmpv6_statistics[1] = kmalloc_percpu(sizeof (struct icmpv6_mib),
-						GFP_KERNEL);
-	if (!icmpv6_statistics[1])
-		goto err_icmp_mib1;
-	
-	udp_stats_in6[0] = kmalloc_percpu(sizeof (struct udp_mib),
-						GFP_KERNEL);
-	if (!udp_stats_in6[0])
-		goto err_udp_mib0;
-	udp_stats_in6[1] = kmalloc_percpu(sizeof (struct udp_mib),
-						GFP_KERNEL);
-	if (!udp_stats_in6[1])
-		goto err_udp_mib1;
-
-	/* Zero all percpu versions of the mibs */
+	if (ptr == NULL)
+		return -EINVAL;
+
+	ptr[0] = kmalloc_percpu(mibsize, GFP_KERNEL);
+	if (!ptr[0])
+		goto err0;
+
+	ptr[1] = kmalloc_percpu(mibsize, GFP_KERNEL);
+	if (!ptr[1])
+		goto err1;
+
+	/* Zero percpu version of the mibs */
 	for (i = 0; i < NR_CPUS; i++) {
 		if (cpu_possible(i)) {
-		memset(per_cpu_ptr(ipv6_statistics[0], i), 0,
-				sizeof (struct ipv6_mib));
-		memset(per_cpu_ptr(ipv6_statistics[1], i), 0,
-				sizeof (struct ipv6_mib));
-		memset(per_cpu_ptr(icmpv6_statistics[0], i), 0,
-				sizeof (struct icmpv6_mib));
-		memset(per_cpu_ptr(icmpv6_statistics[1], i), 0,
-				sizeof (struct icmpv6_mib));
-		memset(per_cpu_ptr(udp_stats_in6[0], i), 0,
-				sizeof (struct udp_mib));
-		memset(per_cpu_ptr(udp_stats_in6[1], i), 0,
-				sizeof (struct udp_mib));
+			memset(per_cpu_ptr(ptr[0], i), 0, mibsize);
+			memset(per_cpu_ptr(ptr[1], i), 0, mibsize);
 		}
 	}
 	return 0;
 
-err_udp_mib1:
-	kfree_percpu(udp_stats_in6[0]);
-err_udp_mib0:
-	kfree_percpu(icmpv6_statistics[1]);
-err_icmp_mib1:
-	kfree_percpu(icmpv6_statistics[0]);
-err_icmp_mib0:
-	kfree_percpu(ipv6_statistics[1]);
-err_ip_mib1:
-	kfree_percpu(ipv6_statistics[0]);
-err_ip_mib0:
+err1:
+	kfree_percpu(ptr[0]);
+	ptr[0] = NULL;
+err0:
+	return -ENOMEM;
+}
+
+void
+snmp6_mib_free(void *ptr[2])
+{
+	if (ptr == NULL)
+		return;
+	kfree_percpu(ptr[0]);
+	kfree_percpu(ptr[1]);
+	ptr[0] = ptr[1] = NULL;
+}
+
+static int __init init_ipv6_mibs(void)
+{
+	if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipv6_mib)) < 0)
+		goto err_ip_mib;
+	if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib)) < 0)
+		goto err_icmp_mib;
+	if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
+		goto err_udp_mib;
+	return 0;
+
+err_udp_mib:
+	snmp6_mib_free((void **)icmpv6_statistics);
+err_icmp_mib:
+	snmp6_mib_free((void **)ipv6_statistics);
+err_ip_mib:
 	return -ENOMEM;
 	
 }
 
 static void cleanup_ipv6_mibs(void)
 {
-	kfree_percpu(ipv6_statistics[0]);
-	kfree_percpu(ipv6_statistics[1]);
-	kfree_percpu(icmpv6_statistics[0]);
-	kfree_percpu(icmpv6_statistics[1]);
-	kfree_percpu(udp_stats_in6[0]);
-	kfree_percpu(udp_stats_in6[1]);
+	snmp6_mib_free((void **)ipv6_statistics);
+	snmp6_mib_free((void **)icmpv6_statistics);
+	snmp6_mib_free((void **)udp_stats_in6);
 }
 
 extern int ipv6_misc_proc_init(void);

net/ipv6/icmp.c

@@ -354,7 +354,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
 	ip6_build_xmit(sk, icmpv6_getfrag, &msg, &fl, len, NULL, -1,
 		       MSG_DONTWAIT);
 	if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
-		ICMP6_STATS_PTR_BH(Icmp6OutDestUnreachs) [type-ICMPV6_DEST_UNREACH]++;
+		ICMP6_INC_STATS_OFFSET_BH(Icmp6OutDestUnreachs, type-ICMPV6_DEST_UNREACH);
 	ICMP6_INC_STATS_BH(Icmp6OutMsgs);
 out:
 	icmpv6_xmit_unlock();
@@ -517,9 +517,9 @@ static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
 	type = hdr->icmp6_type;
 
 	if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
-		ICMP6_STATS_PTR_BH(Icmp6InDestUnreachs)[type-ICMPV6_DEST_UNREACH]++;
+		ICMP6_INC_STATS_OFFSET_BH(Icmp6InDestUnreachs, type-ICMPV6_DEST_UNREACH);
 	else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT)
-		ICMP6_STATS_PTR_BH(Icmp6InEchos)[type-ICMPV6_ECHO_REQUEST]++;
+		ICMP6_INC_STATS_OFFSET_BH(Icmp6InEchos, type-ICMPV6_ECHO_REQUEST);
 
 	switch (type) {
 	case ICMPV6_ECHO_REQUEST:

net/ipv6/proc.c

@@ -10,12 +10,14 @@
  * Version:	$Id: proc.c,v 1.17 2002/02/01 22:01:04 davem Exp $
  *
  * Authors:	David S. Miller (davem@caip.rutgers.edu)
+ * 		YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
  *
  *		This program is free software; you can redistribute it and/or
  *		modify it under the terms of the GNU General Public License
  *		as published by the Free Software Foundation; either version
  *		2 of the License, or (at your option) any later version.
  */
+#include <linux/config.h>
 #include <linux/sched.h>
 #include <linux/socket.h>
 #include <linux/net.h>
@@ -53,14 +55,16 @@ static int sockstat6_seq_show(struct seq_file *seq, void *v)
 }
 
 
-static struct snmp6_item
+struct snmp6_item
 {
 	char *name;
-	void **mib;
 	int   offset;
-} snmp6_list[] = {
+};
+#define SNMP6_SENTINEL	{ .name = NULL, .offset = 0 }
+
+static struct snmp6_item snmp6_ipv6_list[] = {
 /* ipv6 mib according to draft-ietf-ipngwg-ipv6-mib-04 */
-#define SNMP6_GEN(x) { #x , (void **)ipv6_statistics, offsetof(struct ipv6_mib, x) }
+#define SNMP6_GEN(x) { .name = #x , .offset = offsetof(struct ipv6_mib, x) }
 	SNMP6_GEN(Ip6InReceives),
 	SNMP6_GEN(Ip6InHdrErrors),
 	SNMP6_GEN(Ip6InTooBigErrors),
@@ -84,6 +88,10 @@ static struct snmp6_item
 	SNMP6_GEN(Ip6InMcastPkts),
 	SNMP6_GEN(Ip6OutMcastPkts),
 #undef SNMP6_GEN
+	SNMP6_SENTINEL
+};
+
+static struct snmp6_item snmp6_icmp6_list[] = {
 /* icmpv6 mib according to draft-ietf-ipngwg-ipv6-icmp-mib-02
 
    Exceptions:  {In|Out}AdminProhibs are removed, because I see
@@ -94,7 +102,7 @@ static struct snmp6_item
 		OutRouterAdvertisements too.
 		OutGroupMembQueries too.
  */
-#define SNMP6_GEN(x) { #x , (void **)icmpv6_statistics, offsetof(struct icmpv6_mib, x) }
+#define SNMP6_GEN(x) { .name = #x , .offset = offsetof(struct icmpv6_mib, x) }
 	SNMP6_GEN(Icmp6InMsgs),
 	SNMP6_GEN(Icmp6InErrors),
 	SNMP6_GEN(Icmp6InDestUnreachs),
@@ -124,12 +132,17 @@ static struct snmp6_item
 	SNMP6_GEN(Icmp6OutGroupMembResponses),
 	SNMP6_GEN(Icmp6OutGroupMembReductions),
 #undef SNMP6_GEN
-#define SNMP6_GEN(x) { "Udp6" #x , (void **)udp_stats_in6, offsetof(struct udp_mib, Udp##x) }
+	SNMP6_SENTINEL
+};
+
+static struct snmp6_item snmp6_udp6_list[] = {
+#define SNMP6_GEN(x) { .name = "Udp6" #x , .offset = offsetof(struct udp_mib, Udp##x) }
 	SNMP6_GEN(InDatagrams),
 	SNMP6_GEN(NoPorts),
 	SNMP6_GEN(InErrors),
-	SNMP6_GEN(OutDatagrams)
+	SNMP6_GEN(OutDatagrams),
 #undef SNMP6_GEN
+	SNMP6_SENTINEL
 };
 
 static unsigned long
@@ -151,18 +164,23 @@ fold_field(void *mib[], int offt)
         return res;
 }
 
-static int snmp6_seq_show(struct seq_file *seq, void *v)
+static inline void
+snmp6_seq_show_item(struct seq_file *seq, void **mib, struct snmp6_item *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].offset));
+}
 
-	for (i=0; i<sizeof(snmp6_list)/sizeof(snmp6_list[0]); i++)
-		seq_printf(seq, "%-32s\t%lu\n", snmp6_list[i].name,
-			       fold_field(snmp6_list[i].mib, snmp6_list[i].offset));
-
+static int snmp6_seq_show(struct seq_file *seq, void *v)
+{
+	snmp6_seq_show_item(seq, (void **)ipv6_statistics, snmp6_ipv6_list);
+	snmp6_seq_show_item(seq, (void **)icmpv6_statistics, snmp6_icmp6_list);
+	snmp6_seq_show_item(seq, (void **)udp_stats_in6, snmp6_udp6_list);
 	return 0;
 }
 
-
 static int sockstat6_seq_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, sockstat6_seq_show, NULL);