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 <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index cb3a57d46af6..244a624e0b18 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 2dc4b0190878..1446bec895a2 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);