From 999890b21a8eff7559a140fcbd2cd4b34e685c76 Mon Sep 17 00:00:00 2001 From: Benjamin Thery Date: Wed, 3 Dec 2008 22:22:16 -0800 Subject: [PATCH] net: /proc/net/ip_mr_cache, display Iif as a signed short Today, iproute2 fails to show multicast forwarding unresolved cache entries while scanning /proc/net/ip_mr_cache. Indeed, it expects to see -1 in 'Iif' column to identify unresolved entries but the kernel outputs 65535. It's a signed/unsigned issue: 'Iif', the source interface, is retrieved from member mfc_parent in struct mfc_cache. mfc_parent is a vifi_t: unsigned short, but is displayed in ipmr_mfc_seq_show() as "%-3d", signed integer. In unresolevd entries, the 65535 value (0xFFFF) comes from this define: #define ALL_VIFS ((vifi_t)(-1)) That may explains why the guy who added support for this in iproute2 thought a -1 should be expected. I don't know if this must be fixed in kernel or in iproute2. Who is right? What is the correct API? How was it designed originally? I let you decide if it should goes in the kernel or be fixed in iproute2. Signed-off-by: Benjamin Thery Signed-off-by: David S. Miller --- net/ipv4/ipmr.c | 2 +- net/ipv6/ip6mr.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index cb3a57d..244a624 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -1879,7 +1879,7 @@ static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) const struct mfc_cache *mfc = v; const struct ipmr_mfc_iter *it = seq->private; - seq_printf(seq, "%08lX %08lX %-3d", + seq_printf(seq, "%08lX %08lX %-3hd", (unsigned long) mfc->mfc_mcastgrp, (unsigned long) mfc->mfc_origin, mfc->mfc_parent); diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c index 2dc4b01..1446bec 100644 --- a/net/ipv6/ip6mr.c +++ b/net/ipv6/ip6mr.c @@ -297,7 +297,7 @@ static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) const struct mfc6_cache *mfc = v; const struct ipmr_mfc_iter *it = seq->private; - seq_printf(seq, "%pI6 %pI6 %-3d", + seq_printf(seq, "%pI6 %pI6 %-3hd", &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, mfc->mf6c_parent); -- 2.7.4