Commit 8da86466 authored by YOSHIFUJI Hideaki/吉藤英明's avatar YOSHIFUJI Hideaki/吉藤英明 Committed by David S. Miller
Browse files

net: neighbour: Add mcast_resolicit to configure the number of multicast... 


net: neighbour: Add mcast_resolicit to configure the number of multicast resolicitations in PROBE state.

We send unicast neighbor (ARP or NDP) solicitations ucast_probes
times in PROBE state.  Zhu Yanjun reported that some implementation
does not reply against them and the entry will become FAILED, which
is undesirable.

We had been dealt with such nodes by sending multicast probes mcast_
solicit times after unicast probes in PROBE state.  In 2003, I made
a change not to send them to improve compatibility with IPv6 NDP.

Let's introduce per-protocol per-interface sysctl knob "mcast_
reprobe" to configure the number of multicast (re)solicitation for
reconfirmation in PROBE state.  The default is 0, since we have
been doing so for 10+ years.

Reported-by: default avatarZhu Yanjun <Yanjun.Zhu@windriver.com>
CC: Ulf Samuelsson <ulf.samuelsson@ericsson.com>
Signed-off-by: default avatarYOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>
Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fc300dc3

include/net/neighbour.h

+1 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ enum { 
	NEIGH_VAR_MCAST_PROBES,

	NEIGH_VAR_UCAST_PROBES,

	NEIGH_VAR_APP_PROBES,

	NEIGH_VAR_MCAST_REPROBES,

	NEIGH_VAR_RETRANS_TIME,

	NEIGH_VAR_BASE_REACHABLE_TIME,

	NEIGH_VAR_DELAY_PROBE_TIME,

include/uapi/linux/neighbour.h

+1 −0
Original line number Diff line number Diff line
@@ -126,6 +126,7 @@ enum { 
	NDTPA_PROXY_QLEN,		/* u32 */

	NDTPA_LOCKTIME,			/* u64, msecs */

	NDTPA_QUEUE_LENBYTES,		/* u32 */

	NDTPA_MCAST_REPROBES,		/* u32 */

	__NDTPA_MAX

};

#define NDTPA_MAX (__NDTPA_MAX - 1)

net/core/neighbour.c

+11 −4
Original line number Diff line number Diff line
@@ -817,10 +817,9 @@ out: 
static __inline__ int neigh_max_probes(struct neighbour *n)

{

	struct neigh_parms *p = n->parms;

	int max_probes = NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES);

	if (!(n->nud_state & NUD_PROBE))

		max_probes += NEIGH_VAR(p, MCAST_PROBES);

	return max_probes;

	return NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES) +

	       (n->nud_state & NUD_PROBE ? NEIGH_VAR(p, MCAST_REPROBES) :

	        NEIGH_VAR(p, MCAST_PROBES));

}



static void neigh_invalidate(struct neighbour *neigh)
@@ -1742,6 +1741,8 @@ static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) 
			NEIGH_VAR(parms, UCAST_PROBES)) ||

	    nla_put_u32(skb, NDTPA_MCAST_PROBES,

			NEIGH_VAR(parms, MCAST_PROBES)) ||

	    nla_put_u32(skb, NDTPA_MCAST_REPROBES,

			NEIGH_VAR(parms, MCAST_REPROBES)) ||

	    nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time) ||

	    nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME,

			  NEIGH_VAR(parms, BASE_REACHABLE_TIME)) ||
@@ -1901,6 +1902,7 @@ static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { 
	[NDTPA_APP_PROBES]		= { .type = NLA_U32 },

	[NDTPA_UCAST_PROBES]		= { .type = NLA_U32 },

	[NDTPA_MCAST_PROBES]		= { .type = NLA_U32 },

	[NDTPA_MCAST_REPROBES]		= { .type = NLA_U32 },

	[NDTPA_BASE_REACHABLE_TIME]	= { .type = NLA_U64 },

	[NDTPA_GC_STALETIME]		= { .type = NLA_U64 },

	[NDTPA_DELAY_PROBE_TIME]	= { .type = NLA_U64 },
@@ -2001,6 +2003,10 @@ static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh) 
				NEIGH_VAR_SET(p, MCAST_PROBES,

					      nla_get_u32(tbp[i]));

				break;

			case NDTPA_MCAST_REPROBES:

				NEIGH_VAR_SET(p, MCAST_REPROBES,

					      nla_get_u32(tbp[i]));

				break;

			case NDTPA_BASE_REACHABLE_TIME:

				NEIGH_VAR_SET(p, BASE_REACHABLE_TIME,

					      nla_get_msecs(tbp[i]));
@@ -2987,6 +2993,7 @@ static struct neigh_sysctl_table { 
		NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"),

		NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"),

		NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"),

		NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"),

		NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"),

		NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"),

		NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"),

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