GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-22 06:32:08 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

[SCTP]: Handle address add/delete events in a more efficient way.

Browse source 
Currently in SCTP, we maintain a local address list by rebuilding the whole
list from the device list whenever we get a address add/delete event.

This patch fixes it by only adding/deleting the address for which we
receive the event.

Also removed the sctp_local_addr_lock() which is no longer needed as we
now use list_for_each_safe() to traverse this list. This fixes the bugs
in sctp_copy_laddrs_xxx() routines where we do copy_to_user() while
holding this lock.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sridhar Samudrala 2006-12-13 16:26:26 -08:00 • committed by David S. Miller
parent 6931ba7cef
commit 29c7cf9618
4 changed files with 81 additions and 66 deletions
Download patch file Download diff file Expand all files Collapse all files

69
net/sctp/protocol.c
View file

@ -163,7 +163,7 @@ static void sctp_v4_copy_addrlist(struct list_head *addrlist,
/* Extract our IP addresses from the system and stash them in the
* protocol structure.
*/
static void __sctp_get_local_addr_list(void)
static void sctp_get_local_addr_list(void)
{
struct net_device *dev;
struct list_head *pos;
@ -179,17 +179,8 @@ static void __sctp_get_local_addr_list(void)
read_unlock(&dev_base_lock);
}
static void sctp_get_local_addr_list(void)
{
unsigned long flags;
sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
__sctp_get_local_addr_list();
sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
}
/* Free the existing local addresses. */
static void __sctp_free_local_addr_list(void)
static void sctp_free_local_addr_list(void)
{
struct sctp_sockaddr_entry *addr;
struct list_head *pos, *temp;
@ -201,27 +192,15 @@ static void __sctp_free_local_addr_list(void)
}
}
/* Free the existing local addresses. */
static void sctp_free_local_addr_list(void)
{
unsigned long flags;
sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
__sctp_free_local_addr_list();
sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
}
/* Copy the local addresses which are valid for 'scope' into 'bp'. */
int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
gfp_t gfp, int copy_flags)
{
struct sctp_sockaddr_entry *addr;
int error = 0;
struct list_head *pos;
unsigned long flags;
struct list_head *pos, *temp;
sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
list_for_each(pos, &sctp_local_addr_list) {
list_for_each_safe(pos, temp, &sctp_local_addr_list) {
addr = list_entry(pos, struct sctp_sockaddr_entry, list);
if (sctp_in_scope(&addr->a, scope)) {
/* Now that the address is in scope, check to see if
@ -242,7 +221,6 @@ int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
}
end_copy:
sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
return error;
}
@ -622,18 +600,36 @@ static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
}
/* Event handler for inet address addition/deletion events.
* Basically, whenever there is an event, we re-build our local address list.
*/
/* Event handler for inet address addition/deletion events. */
int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
void *ptr)
{
unsigned long flags;
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
struct sctp_sockaddr_entry *addr;
struct list_head *pos, *temp;
sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
__sctp_free_local_addr_list();
__sctp_get_local_addr_list();
sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
switch (ev) {
case NETDEV_UP:
addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
if (addr) {
addr->a.v4.sin_family = AF_INET;
addr->a.v4.sin_port = 0;
addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
list_add_tail(&addr->list, &sctp_local_addr_list);
}
break;
case NETDEV_DOWN:
list_for_each_safe(pos, temp, &sctp_local_addr_list) {
addr = list_entry(pos, struct sctp_sockaddr_entry, list);
if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
list_del(pos);
kfree(addr);
break;
}
}
break;
}
return NOTIFY_DONE;
}
@ -1172,13 +1168,12 @@ SCTP_STATIC __init int sctp_init(void)
/* Initialize the local address list. */
INIT_LIST_HEAD(&sctp_local_addr_list);
spin_lock_init(&sctp_local_addr_lock);
sctp_get_local_addr_list();
/* Register notifier for inet address additions/deletions. */
register_inetaddr_notifier(&sctp_inetaddr_notifier);
sctp_get_local_addr_list();
__unsafe(THIS_MODULE);
status = 0;
out: