From 29c7cf96186ac14ce7380633f690fc39732ff03a Mon Sep 17 00:00:00 2001 From: Sridhar Samudrala Date: Wed, 13 Dec 2006 16:26:26 -0800 Subject: [SCTP]: Handle address add/delete events in a more efficient way. 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 Signed-off-by: David S. Miller --- net/sctp/protocol.c | 69 +++++++++++++++++++++++++---------------------------- 1 file changed, 32 insertions(+), 37 deletions(-) (limited to 'net/sctp/protocol.c') diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index f2ba8615895..b61f3341e0a 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -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: -- cgit v1.2.3