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authorBenjamin Thery <benjamin.thery@bull.net>2008-12-03 22:21:47 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-03 22:21:47 -0800
commit1ea472e2dedcf23d5f31c63fc790cccfab93c0de (patch)
tree1886e87c59bc3efe9edee6f2473d5a2ad5b22e9e
parent9de6d99a7559d20f7ababd1cacdc61ee5315f3c1 (diff)
net: fix /proc/net/ip_mr_cache display - V2
/proc/net/ip_mr_cache and /proc/net/ip6_mr_cache displays garbage when showing unresolved mfc_cache entries. [root@qemu tests]# cat /proc/net/ip_mr_cache Group Origin Iif Pkts Bytes Wrong Oifs 014C00EF 010014AC 1 10 10050 0 2:1 3:1 024C00EF 010014AC 65535 514 2 -559067475 The first line is correct. It is a resolved cache entry, 10 packets used it... The second line represents an unresolved entry, and the columns Pkts(4th), Bytes(5th) and Wrong(6th) just show garbage. In struct mfc_cache, there's an union to store data for resolved and unresolved cases. And what ipmr_mfc_seq_show() is printing in these columns for the unresolved entries is some bytes from mfc_cache.mfc_un.res. Bad. (eg. In our case -559067475 is in fact 0xdead4ead which is the spinlock magic from mfc_cache.mfc_un.unres.unresolved.lock.magic). This patch replaces the garbage data written in these columns for the unresolved entries by '0' (zeros) which is more correct. This change doesn't break the ABI. Also, mfc->mfc_un.res.pkt, mfc->mfc_un.res.bytes, mfc->mfc_un.res.wrong_if are unsigned long. It applies on top of net-next-2.6. The patch for net-2.6 is slightly different because of the NIP6_FMT to %pI6 conversion that was made in the seq_printf. Changelog: ========== V2: * Instead of breaking the ABI by suppressing the columns that have no meaning for unresolved entries, fill them with 0 values. Signed-off-by: Benjamin Thery <benjamin.thery@bull.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/ipmr.c16
-rw-r--r--net/ipv6/ip6mr.c16
2 files changed, 22 insertions, 10 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 77fc4d3fdf6..cb3a57d46af 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1879,15 +1879,16 @@ 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 %8ld %8ld %8ld",
+ seq_printf(seq, "%08lX %08lX %-3d",
(unsigned long) mfc->mfc_mcastgrp,
(unsigned long) mfc->mfc_origin,
- mfc->mfc_parent,
- mfc->mfc_un.res.pkt,
- mfc->mfc_un.res.bytes,
- mfc->mfc_un.res.wrong_if);
+ mfc->mfc_parent);
if (it->cache != &mfc_unres_queue) {
+ seq_printf(seq, " %8lu %8lu %8lu",
+ mfc->mfc_un.res.pkt,
+ mfc->mfc_un.res.bytes,
+ mfc->mfc_un.res.wrong_if);
for (n = mfc->mfc_un.res.minvif;
n < mfc->mfc_un.res.maxvif; n++ ) {
if (VIF_EXISTS(n)
@@ -1896,6 +1897,11 @@ static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
" %2d:%-3d",
n, mfc->mfc_un.res.ttls[n]);
}
+ } else {
+ /* unresolved mfc_caches don't contain
+ * pkt, bytes and wrong_if values
+ */
+ seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
}
seq_putc(seq, '\n');
}
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index dfba9fd0c24..2dc4b019087 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -297,14 +297,15 @@ 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 %8ld %8ld %8ld",
+ seq_printf(seq, "%pI6 %pI6 %-3d",
&mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
- mfc->mf6c_parent,
- mfc->mfc_un.res.pkt,
- mfc->mfc_un.res.bytes,
- mfc->mfc_un.res.wrong_if);
+ mfc->mf6c_parent);
if (it->cache != &mfc_unres_queue) {
+ seq_printf(seq, " %8lu %8lu %8lu",
+ mfc->mfc_un.res.pkt,
+ mfc->mfc_un.res.bytes,
+ mfc->mfc_un.res.wrong_if);
for (n = mfc->mfc_un.res.minvif;
n < mfc->mfc_un.res.maxvif; n++) {
if (MIF_EXISTS(n) &&
@@ -313,6 +314,11 @@ static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
" %2d:%-3d",
n, mfc->mfc_un.res.ttls[n]);
}
+ } else {
+ /* unresolved mfc_caches don't contain
+ * pkt, bytes and wrong_if values
+ */
+ seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
}
seq_putc(seq, '\n');
}