[IPV6]: Add ICMPMsgStats MIB (RFC 4293) [rev 2]

Background: RFC 4293 deprecates existing individual, named ICMP
type counters to be replaced with the ICMPMsgStatsTable. This table
includes entries for both IPv4 and IPv6, and requires counting of all
ICMP types, whether or not the machine implements the type.

These patches "remove" (but not really) the existing counters, and
replace them with the ICMPMsgStats tables for v4 and v6.
It includes the named counters in the /proc places they were, but gets the
values for them from the new tables. It also counts packets generated
from raw socket output (e.g., OutEchoes, MLD queries, RA's from
radvd, etc).

Changes:
1) create icmpmsg_statistics mib
2) create icmpv6msg_statistics mib
3) modify existing counters to use these
4) modify /proc/net/snmp to add "IcmpMsg" with all ICMP types
        listed by number for easy SNMP parsing
5) modify /proc/net/snmp printing for "Icmp" to get the named data
        from new counters.
[new to 2nd revision]
6) support per-interface ICMP stats
7) use common macro for per-device stat macros

Signed-off-by: David L Stevens <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: David L Stevens

include/linux/snmp.h

@@ -91,35 +91,12 @@ enum
 	ICMP6_MIB_NUM = 0,
 	ICMP6_MIB_INMSGS,			/* InMsgs */
 	ICMP6_MIB_INERRORS,			/* InErrors */
-	ICMP6_MIB_INDESTUNREACHS,		/* InDestUnreachs */
-	ICMP6_MIB_INPKTTOOBIGS,			/* InPktTooBigs */
-	ICMP6_MIB_INTIMEEXCDS,			/* InTimeExcds */
-	ICMP6_MIB_INPARMPROBLEMS,		/* InParmProblems */
-	ICMP6_MIB_INECHOS,			/* InEchos */
-	ICMP6_MIB_INECHOREPLIES,		/* InEchoReplies */
-	ICMP6_MIB_INGROUPMEMBQUERIES,		/* InGroupMembQueries */
-	ICMP6_MIB_INGROUPMEMBRESPONSES,		/* InGroupMembResponses */
-	ICMP6_MIB_INGROUPMEMBREDUCTIONS,	/* InGroupMembReductions */
-	ICMP6_MIB_INROUTERSOLICITS,		/* InRouterSolicits */
-	ICMP6_MIB_INROUTERADVERTISEMENTS,	/* InRouterAdvertisements */
-	ICMP6_MIB_INNEIGHBORSOLICITS,		/* InNeighborSolicits */
-	ICMP6_MIB_INNEIGHBORADVERTISEMENTS,	/* InNeighborAdvertisements */
-	ICMP6_MIB_INREDIRECTS,			/* InRedirects */
 	ICMP6_MIB_OUTMSGS,			/* OutMsgs */
-	ICMP6_MIB_OUTDESTUNREACHS,		/* OutDestUnreachs */
-	ICMP6_MIB_OUTPKTTOOBIGS,		/* OutPktTooBigs */
-	ICMP6_MIB_OUTTIMEEXCDS,			/* OutTimeExcds */
-	ICMP6_MIB_OUTPARMPROBLEMS,		/* OutParmProblems */
-	ICMP6_MIB_OUTECHOREPLIES,		/* OutEchoReplies */
-	ICMP6_MIB_OUTROUTERSOLICITS,		/* OutRouterSolicits */
-	ICMP6_MIB_OUTNEIGHBORSOLICITS,		/* OutNeighborSolicits */
-	ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS,	/* OutNeighborAdvertisements */
-	ICMP6_MIB_OUTREDIRECTS,			/* OutRedirects */
-	ICMP6_MIB_OUTGROUPMEMBRESPONSES,	/* OutGroupMembResponses */
-	ICMP6_MIB_OUTGROUPMEMBREDUCTIONS,	/* OutGroupMembReductions */
 	__ICMP6_MIB_MAX
 };
 
+#define __ICMP6MSG_MIB_MAX 512 /* Out+In for all 8-bit ICMPv6 types */
+
 /* tcp mib definitions */
 /*
  * RFC 1213:  MIB-II TCP group

include/net/if_inet6.h

@@ -154,6 +154,7 @@ struct ipv6_devstat {
 	struct proc_dir_entry	*proc_dir_entry;
 	DEFINE_SNMP_STAT(struct ipstats_mib, ipv6);
 	DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6);
+	DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg);
 };
 
 struct inet6_dev 

include/net/ipv6.h

@@ -112,52 +112,49 @@ struct frag_hdr {
 extern int sysctl_ipv6_bindv6only;
 extern int sysctl_mld_max_msf;
 
-/* MIBs */
-DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
-#define IP6_INC_STATS(idev,field)		({			\
+#define _DEVINC(statname, modifier, idev, field)			\
+({									\
 	struct inet6_dev *_idev = (idev);				\
 	if (likely(_idev != NULL))					\
-		SNMP_INC_STATS(_idev->stats.ipv6, field);		\
-	SNMP_INC_STATS(ipv6_statistics, field);				\
-})
-#define IP6_INC_STATS_BH(idev,field)		({			\
-	struct inet6_dev *_idev = (idev);				\
-	if (likely(_idev != NULL))					\
-		SNMP_INC_STATS_BH(_idev->stats.ipv6, field);		\
-	SNMP_INC_STATS_BH(ipv6_statistics, field);			\
-})
-#define IP6_INC_STATS_USER(idev,field)		({			\
-	struct inet6_dev *_idev = (idev);				\
-	if (likely(_idev != NULL))					\
-		SNMP_INC_STATS_USER(_idev->stats.ipv6, field);		\
-	SNMP_INC_STATS_USER(ipv6_statistics, field);			\
+		SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
+	SNMP_INC_STATS##modifier(statname##_statistics, (field));	\
 })
+
+/* MIBs */
+DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
+
+#define IP6_INC_STATS(idev,field)	_DEVINC(ipv6, , idev, field)
+#define IP6_INC_STATS_BH(idev,field)	_DEVINC(ipv6, _BH, idev, field)
+#define IP6_INC_STATS_USER(idev,field)	_DEVINC(ipv6, _USER, idev, field)
+
 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
-#define ICMP6_INC_STATS(idev, field)		({			\
-	struct inet6_dev *_idev = (idev);				\
-	if (likely(_idev != NULL))					\
-		SNMP_INC_STATS(idev->stats.icmpv6, field); 		\
-	SNMP_INC_STATS(icmpv6_statistics, field);			\
-})
-#define ICMP6_INC_STATS_BH(idev, field)		({			\
-	struct inet6_dev *_idev = (idev);				\
-	if (likely(_idev != NULL))					\
-		SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field);	\
-	SNMP_INC_STATS_BH(icmpv6_statistics, field);			\
-})
-#define ICMP6_INC_STATS_USER(idev, field) 	({			\
-	struct inet6_dev *_idev = (idev);				\
-	if (likely(_idev != NULL))					\
-		SNMP_INC_STATS_USER(_idev->stats.icmpv6, field);	\
-	SNMP_INC_STATS_USER(icmpv6_statistics, field);			\
-})
+DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
+
+#define ICMP6_INC_STATS(idev, field)	_DEVINC(icmpv6, , idev, field)
+#define ICMP6_INC_STATS_BH(idev, field)	_DEVINC(icmpv6, _BH, idev, field)
+#define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
+
 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset)	({			\
 	struct inet6_dev *_idev = idev;						\
 	__typeof__(offset) _offset = (offset);					\
 	if (likely(_idev != NULL))						\
 		SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset);	\
 	SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset);    	\
 })
+
+#define ICMP6MSGOUT_INC_STATS(idev, field) \
+	_DEVINC(icmpv6msg, , idev, field +256)
+#define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
+	_DEVINC(icmpv6msg, _BH, idev, field +256)
+#define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
+	_DEVINC(icmpv6msg, _USER, idev, field +256)
+#define ICMP6MSGIN_INC_STATS(idev, field) \
+	 _DEVINC(icmpv6msg, , idev, field)
+#define ICMP6MSGIN_INC_STATS_BH(idev, field) \
+	_DEVINC(icmpv6msg, _BH, idev, field)
+#define ICMP6MSGIN_INC_STATS_USER(idev, field) \
+	_DEVINC(icmpv6msg, _USER, idev, field)
+
 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
 #define UDP6_INC_STATS_BH(field, is_udplite) 			      do  {  \

include/net/snmp.h

@@ -88,6 +88,12 @@ struct icmpv6_mib {
 	unsigned long	mibs[ICMP6_MIB_MAX];
 } __SNMP_MIB_ALIGN__;
 
+#define ICMP6MSG_MIB_MAX  __ICMP6MSG_MIB_MAX
+struct icmpv6msg_mib {
+	unsigned long	mibs[ICMP6MSG_MIB_MAX];
+} __SNMP_MIB_ALIGN__;
+
+
 /* TCP */
 #define TCP_MIB_MAX	__TCP_MIB_MAX
 struct tcp_mib {

net/ipv6/addrconf.c

@@ -261,9 +261,15 @@ static int snmp6_alloc_dev(struct inet6_dev *idev)
 			  sizeof(struct icmpv6_mib),
 			  __alignof__(struct icmpv6_mib)) < 0)
 		goto err_icmp;
+	if (snmp_mib_init((void **)idev->stats.icmpv6msg,
+			  sizeof(struct icmpv6msg_mib),
+			  __alignof__(struct icmpv6msg_mib)) < 0)
+		goto err_icmpmsg;
 
 	return 0;
 
+err_icmpmsg:
+	snmp_mib_free((void **)idev->stats.icmpv6);
 err_icmp:
 	snmp_mib_free((void **)idev->stats.ipv6);
 err_ip:
@@ -272,6 +278,7 @@ static int snmp6_alloc_dev(struct inet6_dev *idev)
 
 static int snmp6_free_dev(struct inet6_dev *idev)
 {
+	snmp_mib_free((void **)idev->stats.icmpv6msg);
 	snmp_mib_free((void **)idev->stats.icmpv6);
 	snmp_mib_free((void **)idev->stats.ipv6);
 	return 0;

net/ipv6/af_inet6.c

@@ -719,6 +719,9 @@ static int __init init_ipv6_mibs(void)
 	if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 			  __alignof__(struct icmpv6_mib)) < 0)
 		goto err_icmp_mib;
+	if (snmp_mib_init((void **)icmpv6msg_statistics,
+	    sizeof (struct icmpv6msg_mib), __alignof__(struct icmpv6_mib)) < 0)
+		goto err_icmpmsg_mib;
 	if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 			  __alignof__(struct udp_mib)) < 0)
 		goto err_udp_mib;
@@ -730,6 +733,8 @@ static int __init init_ipv6_mibs(void)
 err_udplite_mib:
 	snmp_mib_free((void **)udp_stats_in6);
 err_udp_mib:
+	snmp_mib_free((void **)icmpv6msg_statistics);
+err_icmpmsg_mib:
 	snmp_mib_free((void **)icmpv6_statistics);
 err_icmp_mib:
 	snmp_mib_free((void **)ipv6_statistics);

net/ipv6/icmp.c

@@ -69,6 +69,8 @@
 
 DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly;
 EXPORT_SYMBOL(icmpv6_statistics);
+DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics) __read_mostly;
+EXPORT_SYMBOL(icmpv6msg_statistics);
 
 /*
  *	The ICMP socket(s). This is the most convenient way to flow control
@@ -456,8 +458,6 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info,
 	}
 	err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr));
 
-	if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
-		ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH);
 	ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
 
 out_put:
@@ -547,9 +547,6 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
 	}
 	err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr));
 
-	ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES);
-	ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
-
 out_put:
 	if (likely(idev != NULL))
 		in6_dev_put(idev);
@@ -656,10 +653,7 @@ static int icmpv6_rcv(struct sk_buff **pskb)
 
 	type = hdr->icmp6_type;
 
-	if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
-		ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH);
-	else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT)
-		ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST);
+	ICMP6MSGIN_INC_STATS_BH(idev, type);
 
 	switch (type) {
 	case ICMPV6_ECHO_REQUEST:

net/ipv6/ip6_output.c

@@ -1399,6 +1399,13 @@ int ip6_push_pending_frames(struct sock *sk)
 
 	skb->dst = dst_clone(&rt->u.dst);
 	IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
+	if (proto == IPPROTO_ICMPV6) {
+		struct inet6_dev *idev = ip6_dst_idev(skb->dst);
+
+		ICMP6MSGOUT_INC_STATS_BH(idev, icmp6_hdr(skb)->icmp6_type);
+		ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
+	}
+
 	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dst->dev, dst_output);
 	if (err) {
 		if (err > 0)

net/ipv6/mcast.c

@@ -1479,10 +1479,11 @@ static void mld_sendpack(struct sk_buff *skb)
 	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
 		mld_dev_queue_xmit);
 	if (!err) {
-		ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
-		IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
+		ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
+		ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
+		IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
 	} else
-		IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
+		IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
 
 	if (likely(idev != NULL))
 		in6_dev_put(idev);
@@ -1822,10 +1823,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
 	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
 		mld_dev_queue_xmit);
 	if (!err) {
-		if (type == ICMPV6_MGM_REDUCTION)
-			ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
-		else
-			ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
+		ICMP6MSGOUT_INC_STATS(idev, type);
 		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
 		IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
 	} else

net/ipv6/ndisc.c

@@ -431,7 +431,7 @@ static void __ndisc_send(struct net_device *dev,
 			 struct neighbour *neigh,
 			 struct in6_addr *daddr, struct in6_addr *saddr,
 			 struct icmp6hdr *icmp6h, struct in6_addr *target,
-			 int llinfo, int icmp6_mib_outnd)
+			 int llinfo)
 {
 	struct flowi fl;
 	struct dst_entry *dst;
@@ -441,9 +441,11 @@ static void __ndisc_send(struct net_device *dev,
 	struct inet6_dev *idev;
 	int len;
 	int err;
-	u8 *opt;
+	u8 *opt, type;
+
+	type = icmp6h->icmp6_type;
 
-	ndisc_flow_init(&fl, icmp6h->icmp6_type, saddr, daddr,
+	ndisc_flow_init(&fl, type, saddr, daddr,
 			dev->ifindex);
 
 	dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
@@ -504,7 +506,7 @@ static void __ndisc_send(struct net_device *dev,
 
 	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
 	if (!err) {
-		ICMP6_INC_STATS(idev, icmp6_mib_outnd);
+		ICMP6MSGOUT_INC_STATS(idev, type);
 		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
 	}
 
@@ -542,8 +544,7 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
 
 	__ndisc_send(dev, neigh, daddr, src_addr,
 		     &icmp6h, solicited_addr,
-		     inc_opt ? ND_OPT_TARGET_LL_ADDR : 0,
-		     ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS);
+		     inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
 }
 
 void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
@@ -564,8 +565,7 @@ void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
 
 	__ndisc_send(dev, neigh, daddr, saddr,
 		     &icmp6h, solicit,
-		     !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0,
-		     ICMP6_MIB_OUTNEIGHBORSOLICITS);
+		     !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
 }
 
 void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
@@ -599,8 +599,7 @@ void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
 #endif
 	__ndisc_send(dev, NULL, daddr, saddr,
 		     &icmp6h, NULL,
-		     send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0,
-		     ICMP6_MIB_OUTROUTERSOLICITS);
+		     send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
 }
 
 
@@ -1455,7 +1454,7 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
 	IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
 	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output);
 	if (!err) {
-		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTREDIRECTS);
+		ICMP6MSGOUT_INC_STATS(idev, NDISC_REDIRECT);
 		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
 	}