[patch 1/7] [PATCH] af_iucv: handle netdev events
From: <hidden>
Date: 2012-03-07 12:07:13
Also in:
linux-s390
From: Ursula Braun <redacted> In case of transport through HiperSockets the underlying network interface may switch to DOWN state or the underlying network device may recover. In both cases the socket must change to IUCV_DISCONN state. If the interface goes down, af_iucv has a chance to notify its connection peer in addition. Signed-off-by: Ursula Braun <redacted> Signed-off-by: Frank Blaschka <redacted> --- net/iucv/af_iucv.c | 106 +++++++++++++++++++++++++++++++---------------------- 1 file changed, 62 insertions(+), 44 deletions(-) diff -urpN linux-2.6/net/iucv/af_iucv.c linux-2.6-patched/net/iucv/af_iucv.c
--- linux-2.6/net/iucv/af_iucv.c 2012-03-06 13:35:57.000000000 +0100
+++ linux-2.6-patched/net/iucv/af_iucv.c 2012-03-06 13:35:57.000000000 +0100@@ -453,14 +453,28 @@ static void iucv_sever_path(struct sock } } +/* Send FIN through an IUCV socket for HIPER transport */ +static int iucv_send_ctrl(struct sock *sk, u8 flags) +{ + int err = 0; + int blen; + struct sk_buff *skb; + + blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; + skb = sock_alloc_send_skb(sk, blen, 1, &err); + if (skb) { + skb_reserve(skb, blen); + err = afiucv_hs_send(NULL, sk, skb, flags); + } + return err; +} + /* Close an IUCV socket */ static void iucv_sock_close(struct sock *sk) { struct iucv_sock *iucv = iucv_sk(sk); unsigned long timeo; int err = 0; - int blen; - struct sk_buff *skb; lock_sock(sk);
@@ -471,14 +485,7 @@ static void iucv_sock_close(struct sock case IUCV_CONNECTED: if (iucv->transport == AF_IUCV_TRANS_HIPER) { - /* send fin */ - blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; - skb = sock_alloc_send_skb(sk, blen, 1, &err); - if (skb) { - skb_reserve(skb, blen); - err = afiucv_hs_send(NULL, sk, skb, - AF_IUCV_FLAG_FIN); - } + err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); sk->sk_state = IUCV_DISCONN; sk->sk_state_change(sk); }
@@ -782,26 +789,6 @@ static int iucv_sock_autobind(struct soc return err; } -static int afiucv_hs_connect(struct socket *sock) -{ - struct sock *sk = sock->sk; - struct sk_buff *skb; - int blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; - int err = 0; - - /* send syn */ - skb = sock_alloc_send_skb(sk, blen, 1, &err); - if (!skb) { - err = -ENOMEM; - goto done; - } - skb->dev = NULL; - skb_reserve(skb, blen); - err = afiucv_hs_send(NULL, sk, skb, AF_IUCV_FLAG_SYN); -done: - return err; -} - static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) { struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
@@ -882,7 +869,7 @@ static int iucv_sock_connect(struct sock memcpy(iucv->dst_name, sa->siucv_name, 8); if (iucv->transport == AF_IUCV_TRANS_HIPER) - err = afiucv_hs_connect(sock); + err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); else err = afiucv_path_connect(sock, addr); if (err)
@@ -1332,8 +1319,7 @@ static int iucv_sock_recvmsg(struct kioc struct sock *sk = sock->sk; struct iucv_sock *iucv = iucv_sk(sk); unsigned int copied, rlen; - struct sk_buff *skb, *rskb, *cskb, *sskb; - int blen; + struct sk_buff *skb, *rskb, *cskb; int err = 0; if ((sk->sk_state == IUCV_DISCONN) &&
@@ -1422,15 +1408,7 @@ static int iucv_sock_recvmsg(struct kioc iucv_process_message_q(sk); if (atomic_read(&iucv->msg_recv) >= iucv->msglimit / 2) { - /* send WIN to peer */ - blen = sizeof(struct af_iucv_trans_hdr) + - ETH_HLEN; - sskb = sock_alloc_send_skb(sk, blen, 1, &err); - if (sskb) { - skb_reserve(sskb, blen); - err = afiucv_hs_send(NULL, sk, sskb, - AF_IUCV_FLAG_WIN); - } + err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); if (err) { sk->sk_state = IUCV_DISCONN; sk->sk_state_change(sk);
@@ -2289,6 +2267,44 @@ out_unlock: } } + +/* + * afiucv_netdev_event: handle netdev notifier chain events + */ +static int afiucv_netdev_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct net_device *event_dev = (struct net_device *)ptr; + struct hlist_node *node; + struct sock *sk; + struct iucv_sock *iucv; + + switch (event) { + case NETDEV_REBOOT: + case NETDEV_GOING_DOWN: + sk_for_each(sk, node, &iucv_sk_list.head) { + iucv = iucv_sk(sk); + if ((iucv->hs_dev == event_dev) && + (sk->sk_state == IUCV_CONNECTED)) { + if (event == NETDEV_GOING_DOWN) + iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + } + } + break; + case NETDEV_DOWN: + case NETDEV_UNREGISTER: + default: + break; + } + return NOTIFY_DONE; +} + +static struct notifier_block afiucv_netdev_notifier = { + .notifier_call = afiucv_netdev_event, +}; + static const struct proto_ops iucv_sock_ops = { .family = PF_IUCV, .owner = THIS_MODULE,
@@ -2388,7 +2404,8 @@ static int __init afiucv_init(void) err = afiucv_iucv_init(); if (err) goto out_sock; - } + } else + register_netdevice_notifier(&afiucv_netdev_notifier); dev_add_pack(&iucv_packet_type); return 0;
@@ -2409,7 +2426,8 @@ static void __exit afiucv_exit(void) driver_unregister(&af_iucv_driver); pr_iucv->iucv_unregister(&af_iucv_handler, 0); symbol_put(iucv_if); - } + } else + unregister_netdevice_notifier(&afiucv_netdev_notifier); dev_remove_pack(&iucv_packet_type); sock_unregister(PF_IUCV); proto_unregister(&iucv_proto);