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netdev-linux: Fix tap device stats.

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For tap and internal devices we swap the transmit and receive stats
to appear consistent with other devices.  However, the check whether
to store the stats in a temporary location before the swap did not
include tap devices, which lead to the use of uninitialized memory
when the swap occured.
This commit is contained in:
Jesse Gross 2010-06-01 14:20:46 -07:00
parent b9b0865ac2
commit 92df599cb2
1 changed files with 15 additions and 19 deletions
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34
lib/netdev-linux.c
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@ -779,6 +779,14 @@ netdev_linux_update_is_pseudo(struct netdev_dev_linux *netdev_dev)
}
}
static void
swap_uint64(uint64_t *a, uint64_t *b)
{
*a ^= *b;
*b ^= *a;
*a ^= *b;
}
/* Retrieves current device stats for 'netdev'.
*
* XXX All of the members of struct netdev_stats are 64 bits wide, but on
@ -791,16 +799,9 @@ netdev_linux_get_stats(const struct netdev *netdev_,
netdev_dev_linux_cast(netdev_get_dev(netdev_));
static int use_netlink_stats = -1;
int error;
struct netdev_stats raw_stats;
struct netdev_stats *collect_stats = stats;
COVERAGE_INC(netdev_get_stats);
netdev_linux_update_is_pseudo(netdev_dev);
if (netdev_dev->is_internal) {
collect_stats = &raw_stats;
}
if (use_netlink_stats < 0) {
use_netlink_stats = check_for_working_netlink_stats();
}
@ -809,27 +810,22 @@ netdev_linux_get_stats(const struct netdev *netdev_,
error = get_ifindex(netdev_, &ifindex);
if (!error) {
error = get_stats_via_netlink(ifindex, collect_stats);
error = get_stats_via_netlink(ifindex, stats);
}
} else {
error = get_stats_via_proc(netdev_get_name(netdev_), collect_stats);
error = get_stats_via_proc(netdev_get_name(netdev_), stats);
}
/* If this port is an internal port then the transmit and receive stats
* will appear to be swapped relative to the other ports since we are the
* one sending the data, not a remote computer. For consistency, we swap
* them back here. */
netdev_linux_update_is_pseudo(netdev_dev);
if (!error && (netdev_dev->is_internal || netdev_dev->is_tap)) {
stats->rx_packets = raw_stats.tx_packets;
stats->tx_packets = raw_stats.rx_packets;
stats->rx_bytes = raw_stats.tx_bytes;
stats->tx_bytes = raw_stats.rx_bytes;
stats->rx_errors = raw_stats.tx_errors;
stats->tx_errors = raw_stats.rx_errors;
stats->rx_dropped = raw_stats.tx_dropped;
stats->tx_dropped = raw_stats.rx_dropped;
stats->multicast = raw_stats.multicast;
stats->collisions = raw_stats.collisions;
swap_uint64(&stats->rx_packets, &stats->tx_packets);
swap_uint64(&stats->rx_bytes, &stats->tx_bytes);
swap_uint64(&stats->rx_errors, &stats->tx_errors);
swap_uint64(&stats->rx_dropped, &stats->tx_dropped);
stats->rx_length_errors = 0;
stats->rx_over_errors = 0;
stats->rx_crc_errors = 0;