Adjust the new netdevice scanning code provided by Patrick McHardy:
(1) Restore the function banner comments that were dropped.
(2) Rather than using an array size of 6 in some places and an array size of
ETH_ALEN in others, pass a pointer instead and pass the array size
through so that we can actually check it.
(3) Do the buffer fill count check before checking the for_primary_ifa
condition again. This permits us to skip that check should maxbufs be
reached before we run out of interfaces.
Signed-off-by: David Howells <[email protected]>
---
fs/afs/internal.h | 2 +-
fs/afs/main.c | 2 +-
fs/afs/netdevices.c | 24 +++++++++++++++++++-----
3 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 551db89..d90c158 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -563,7 +563,7 @@ extern void afs_fs_exit(void);
* use-rtnetlink.c
*/
extern int afs_get_ipv4_interfaces(struct afs_interface *, size_t, bool);
-extern int afs_get_MAC_address(u8 [6]);
+extern int afs_get_MAC_address(u8 *, size_t);
/*
* vlclient.c
diff --git a/fs/afs/main.c b/fs/afs/main.c
index 40c2704..80ec6fd 100644
--- a/fs/afs/main.c
+++ b/fs/afs/main.c
@@ -54,7 +54,7 @@ static int __init afs_get_client_UUID(void)
/* read the MAC address of one of the external interfaces and construct
* a UUID from it */
- ret = afs_get_MAC_address(afs_uuid.node);
+ ret = afs_get_MAC_address(afs_uuid.node, sizeof(afs_uuid.node));
if (ret < 0)
return ret;
diff --git a/fs/afs/netdevices.c b/fs/afs/netdevices.c
index 2b30873..ce08977 100644
--- a/fs/afs/netdevices.c
+++ b/fs/afs/netdevices.c
@@ -10,21 +10,33 @@
#include <linux/if_arp.h>
#include "internal.h"
-int afs_get_MAC_address(u8 mac[ETH_ALEN])
+/*
+ * get a MAC address from a random ethernet interface that has a real one
+ * - the buffer will normally be 6 bytes in size
+ */
+int afs_get_MAC_address(u8 *mac, size_t maclen)
{
struct net_device *dev;
int ret = -ENODEV;
+ if (maclen != ETH_ALEN)
+ BUG();
+
rtnl_lock();
dev = __dev_getfirstbyhwtype(ARPHRD_ETHER);
if (dev) {
- memcpy(mac, dev->dev_addr, ETH_ALEN);
+ memcpy(mac, dev->dev_addr, maclen);
ret = 0;
}
rtnl_unlock();
return ret;
}
+/*
+ * get a list of this system's interface IPv4 addresses, netmasks and MTUs
+ * - maxbufs must be at least 1
+ * - returns the number of interface records in the buffer
+ */
int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
bool wantloopback)
{
@@ -32,6 +44,8 @@ int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
struct in_device *idev;
int n = 0;
+ ASSERT(maxbufs > 0);
+
rtnl_lock();
for (dev = dev_base; dev; dev = dev->next) {
if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
@@ -40,13 +54,13 @@ int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
if (!idev)
continue;
for_primary_ifa(idev) {
- if (n == maxbufs)
- goto out;
bufs[n].address.s_addr = ifa->ifa_address;
bufs[n].netmask.s_addr = ifa->ifa_mask;
bufs[n].mtu = dev->mtu;
n++;
- } endfor_ifa(idev)
+ if (n >= maxbufs)
+ goto out;
+ } endfor_ifa(idev);
}
out:
rtnl_unlock();
-
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