diff options
| -rw-r--r-- | include/net/iucv/af_iucv.h | 52 | ||||
| -rw-r--r-- | net/iucv/af_iucv.c | 749 |
2 files changed, 729 insertions, 72 deletions
diff --git a/include/net/iucv/af_iucv.h b/include/net/iucv/af_iucv.h index f82a1e8..f2419cf 100644 --- a/include/net/iucv/af_iucv.h +++ b/include/net/iucv/af_iucv.h @@ -14,6 +14,7 @@ #include <linux/list.h> #include <linux/poll.h> #include <linux/socket.h> +#include <net/iucv/iucv.h> #ifndef AF_IUCV #define AF_IUCV 32 @@ -33,6 +34,7 @@ enum { }; #define IUCV_QUEUELEN_DEFAULT 65535 +#define IUCV_HIPER_MSGLIM_DEFAULT 128 #define IUCV_CONN_TIMEOUT (HZ * 40) #define IUCV_DISCONN_TIMEOUT (HZ * 2) #define IUCV_CONN_IDLE_TIMEOUT (HZ * 60) @@ -57,8 +59,51 @@ struct sock_msg_q { spinlock_t lock; }; +#define AF_IUCV_FLAG_ACK 0x1 +#define AF_IUCV_FLAG_SYN 0x2 +#define AF_IUCV_FLAG_FIN 0x4 +#define AF_IUCV_FLAG_WIN 0x8 + +struct af_iucv_trans_hdr { + u16 magic; + u8 version; + u8 flags; + u16 window; + char destNodeID[8]; + char destUserID[8]; + char destAppName[16]; + char srcNodeID[8]; + char srcUserID[8]; + char srcAppName[16]; /* => 70 bytes */ + struct iucv_message iucv_hdr; /* => 33 bytes */ + u8 pad; /* total 104 bytes */ +} __packed; + +enum iucv_tx_notify { + /* transmission of skb is completed and was successful */ + TX_NOTIFY_OK = 0, + /* target is unreachable */ + TX_NOTIFY_UNREACHABLE = 1, + /* transfer pending queue full */ + TX_NOTIFY_TPQFULL = 2, + /* general error */ + TX_NOTIFY_GENERALERROR = 3, + /* transmission of skb is pending - may interleave + * with TX_NOTIFY_DELAYED_* */ + TX_NOTIFY_PENDING = 4, + /* transmission of skb was done successfully (delayed) */ + TX_NOTIFY_DELAYED_OK = 5, + /* target unreachable (detected delayed) */ + TX_NOTIFY_DELAYED_UNREACHABLE = 6, + /* general error (detected delayed) */ + TX_NOTIFY_DELAYED_GENERALERROR = 7, +}; + #define iucv_sk(__sk) ((struct iucv_sock *) __sk) +#define AF_IUCV_TRANS_IUCV 0 +#define AF_IUCV_TRANS_HIPER 1 + struct iucv_sock { struct sock sk; char src_user_id[8]; @@ -75,6 +120,13 @@ struct iucv_sock { unsigned int send_tag; u8 flags; u16 msglimit; + u16 msglimit_peer; + atomic_t msg_sent; + atomic_t msg_recv; + atomic_t pendings; + int transport; + void (*sk_txnotify)(struct sk_buff *skb, + enum iucv_tx_notify n); }; /* iucv socket options (SOL_IUCV) */ diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index 1d8cb72..c39f3a4 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -27,10 +27,9 @@ #include <asm/cpcmd.h> #include <linux/kmod.h> -#include <net/iucv/iucv.h> #include <net/iucv/af_iucv.h> -#define VERSION "1.1" +#define VERSION "1.2" static char iucv_userid[80]; @@ -92,6 +91,12 @@ do { \ static void iucv_sock_kill(struct sock *sk); static void iucv_sock_close(struct sock *sk); +static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev); +static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, + struct sk_buff *skb, u8 flags); +static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); + /* Call Back functions */ static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); @@ -296,7 +301,11 @@ static inline int iucv_below_msglim(struct sock *sk) if (sk->sk_state != IUCV_CONNECTED) return 1; - return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); + if (iucv->transport == AF_IUCV_TRANS_IUCV) + return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); + else + return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && + (atomic_read(&iucv->pendings) <= 0)); } /** @@ -314,6 +323,79 @@ static void iucv_sock_wake_msglim(struct sock *sk) rcu_read_unlock(); } +/** + * afiucv_hs_send() - send a message through HiperSockets transport + */ +static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, + struct sk_buff *skb, u8 flags) +{ + struct net *net = sock_net(sock); + struct iucv_sock *iucv = iucv_sk(sock); + struct af_iucv_trans_hdr *phs_hdr; + struct sk_buff *nskb; + int err, confirm_recv = 0; + + memset(skb->head, 0, ETH_HLEN); + phs_hdr = (struct af_iucv_trans_hdr *)skb_push(skb, + sizeof(struct af_iucv_trans_hdr)); + skb_reset_mac_header(skb); + skb_reset_network_header(skb); + skb_push(skb, ETH_HLEN); + skb_reset_mac_header(skb); + memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr)); + + phs_hdr->magic = ETH_P_AF_IUCV; + phs_hdr->version = 1; + phs_hdr->flags = flags; + if (flags == AF_IUCV_FLAG_SYN) + phs_hdr->window = iucv->msglimit; + else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { + confirm_recv = atomic_read(&iucv->msg_recv); + phs_hdr->window = confirm_recv; + if (confirm_recv) + phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; + } + memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); + memcpy(phs_hdr->destAppName, iucv->dst_name, 8); + memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); + memcpy(phs_hdr->srcAppName, iucv->src_name, 8); + ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); + ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); + ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); + ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); + if (imsg) + memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); + + rcu_read_lock(); + skb->dev = dev_get_by_index_rcu(net, sock->sk_bound_dev_if); + rcu_read_unlock(); + if (!skb->dev) + return -ENODEV; + if (!(skb->dev->flags & IFF_UP)) + return -ENETDOWN; + if (skb->len > skb->dev->mtu) { + if (sock->sk_type == SOCK_SEQPACKET) + return -EMSGSIZE; + else + skb_trim(skb, skb->dev->mtu); + } + skb->protocol = ETH_P_AF_IUCV; + skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF; + nskb = skb_clone(skb, GFP_ATOMIC); + if (!nskb) + return -ENOMEM; + skb_queue_tail(&iucv->send_skb_q, nskb); + err = dev_queue_xmit(skb); + if (err) { + skb_unlink(nskb, &iucv->send_skb_q); + kfree_skb(nskb); + } else { + atomic_sub(confirm_recv, &iucv->msg_recv); + WARN_ON(atomic_read(&iucv->msg_recv) < 0); + } + return err; +} + /* Timers */ static void iucv_sock_timeout(unsigned long arg) { @@ -382,6 +464,8 @@ static void iucv_sock_close(struct sock *sk) unsigned char user_data[16]; struct iucv_sock *iucv = iucv_sk(sk); unsigned long timeo; + int err, blen; + struct sk_buff *skb; iucv_sock_clear_timer(sk); lock_sock(sk); @@ -392,6 +476,20 @@ static void iucv_sock_close(struct sock *sk) break; 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, + sizeof(struct af_iucv_trans_hdr) + + ETH_HLEN); + err = afiucv_hs_send(NULL, sk, skb, + AF_IUCV_FLAG_FIN); + } + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + } case IUCV_DISCONN: sk->sk_state = IUCV_CLOSING; sk->sk_state_change(sk); @@ -461,10 +559,18 @@ static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio) spin_lock_init(&iucv->message_q.lock); skb_queue_head_init(&iucv->backlog_skb_q); iucv->send_tag = 0; + atomic_set(&iucv->pendings, 0); iucv->flags = 0; - iucv->msglimit = IUCV_QUEUELEN_DEFAULT; + iucv->msglimit = 0; + atomic_set(&iucv->msg_sent, 0); + atomic_set(&iucv->msg_recv, 0); iucv->path = NULL; + iucv->sk_txnotify = afiucv_hs_callback_txnotify; memset(&iucv->src_user_id , 0, 32); + if (pr_iucv) + iucv->transport = AF_IUCV_TRANS_IUCV; + else + iucv->transport = AF_IUCV_TRANS_HIPER; sk->sk_destruct = iucv_sock_destruct; sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; @@ -595,7 +701,9 @@ static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; struct sock *sk = sock->sk; struct iucv_sock *iucv; - int err; + int err = 0; + struct net_device *dev; + char uid[9]; /* Verify the input sockaddr */ if (!addr || addr->sa_family != AF_IUCV) @@ -614,19 +722,46 @@ static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, err = -EADDRINUSE; goto done_unlock; } - if (iucv->path) { - err = 0; + if (iucv->path) goto done_unlock; - } /* Bind the socket */ - memcpy(iucv->src_name, sa->siucv_name, 8); - /* Copy the user id */ - memcpy(iucv->src_user_id, iucv_userid, 8); - sk->sk_state = IUCV_BOUND; - err = 0; + if (pr_iucv) + if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) + goto vm_bind; /* VM IUCV transport */ + /* try hiper transport */ + memcpy(uid, sa->siucv_user_id, sizeof(uid)); + ASCEBC(uid, 8); + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { + if (!memcmp(dev->perm_addr, uid, 8)) { + memcpy(iucv->src_name, sa->siucv_name, 8); + memcpy(iucv->src_user_id, sa->siucv_user_id, 8); + sock->sk->sk_bound_dev_if = dev->ifindex; + sk->sk_state = IUCV_BOUND; + iucv->transport = AF_IUCV_TRANS_HIPER; + if (!iucv->msglimit) + iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; + rcu_read_unlock(); + goto done_unlock; + } + } + rcu_read_unlock(); +vm_bind: + if (pr_iucv) { + /* use local userid for backward compat */ + memcpy(iucv->src_name, sa->siucv_name, 8); + memcpy(iucv->src_user_id, iucv_userid, 8); + sk->sk_state = IUCV_BOUND; + iucv->transport = AF_IUCV_TRANS_IUCV; + if (!iucv->msglimit) + iucv->msglimit = IUCV_QUEUELEN_DEFAULT; + goto done_unlock; + } + /* found no dev to bind */ + err = -ENODEV; done_unlock: /* Release the socket list lock */ write_unlock_bh(&iucv_sk_list.lock); @@ -662,12 +797,33 @@ static int iucv_sock_autobind(struct sock *sk) memcpy(&iucv->src_name, name, 8); + if (!iucv->msglimit) + iucv->msglimit = IUCV_QUEUELEN_DEFAULT; + return err; } -/* Connect an unconnected socket */ -static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, - int alen, int flags) +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; struct sock *sk = sock->sk; @@ -675,27 +831,6 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, unsigned char user_data[16]; int err; - if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) - return -EINVAL; - - if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) - return -EBADFD; - - if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) - return -EINVAL; - - if (sk->sk_state == IUCV_OPEN) { - err = iucv_sock_autobind(sk); - if (unlikely(err)) - return err; - } - - lock_sock(sk); - - /* Set the destination information */ - memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); - memcpy(iucv->dst_name, sa->siucv_name, 8); - high_nmcpy(user_data, sa->siucv_name); low_nmcpy(user_data, iucv->src_name); ASCEBC(user_data, sizeof(user_data)); @@ -728,20 +863,61 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, err = -ECONNREFUSED; break; } - goto done; } +done: + return err; +} - if (sk->sk_state != IUCV_CONNECTED) { +/* Connect an unconnected socket */ +static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, + int alen, int flags) +{ + struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; + struct sock *sk = sock->sk; + struct iucv_sock *iucv = iucv_sk(sk); + int err; + + if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv)) + return -EINVAL; + + if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) + return -EBADFD; + + if (sk->sk_state == IUCV_OPEN && + iucv->transport == AF_IUCV_TRANS_HIPER) + return -EBADFD; /* explicit bind required */ + + if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) + return -EINVAL; + + if (sk->sk_state == IUCV_OPEN) { + err = iucv_sock_autobind(sk); + if (unlikely(err)) + return err; + } + + lock_sock(sk); + + /* Set the destination information */ + memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); + memcpy(iucv->dst_name, sa->siucv_name, 8); + + if (iucv->transport == AF_IUCV_TRANS_HIPER) + err = afiucv_hs_connect(sock); + else + err = afiucv_path_connect(sock, addr); + if (err) + goto done; + + if (sk->sk_state != IUCV_CONNECTED) err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, IUCV_DISCONN), sock_sndtimeo(sk, flags & O_NONBLOCK)); - } - if (sk->sk_state == IUCV_DISCONN) { + if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) err = -ECONNREFUSED; - } - if (err) { + if (err && iucv->transport == AF_IUCV_TRANS_IUCV) { pr_iucv->path_sever(iucv->path, NULL); iucv_path_free(iucv->path); iucv->path = NULL; @@ -965,9 +1141,16 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, * this is fine for SOCK_SEQPACKET (unless we want to support * segmented records using the MSG_EOR flag), but * for SOCK_STREAM we might want to improve it in future */ - skb = sock_alloc_send_skb(sk, len, noblock, &err); + if (iucv->transport == AF_IUCV_TRANS_HIPER) + skb = sock_alloc_send_skb(sk, + len + sizeof(struct af_iucv_trans_hdr) + ETH_HLEN, + noblock, &err); + else + skb = sock_alloc_send_skb(sk, len, noblock, &err); if (!skb) goto out; + if (iucv->transport == AF_IUCV_TRANS_HIPER) + skb_reserve(skb, sizeof(struct af_iucv_trans_hdr) + ETH_HLEN); if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { err = -EFAULT; goto fail; @@ -988,6 +1171,15 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, /* increment and save iucv message tag for msg_completion cbk */ txmsg.tag = iucv->send_tag++; memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); + if (iucv->transport == AF_IUCV_TRANS_HIPER) { + atomic_inc(&iucv->msg_sent); + err = afiucv_hs_send(&txmsg, sk, skb, 0); + if (err) { + atomic_dec(&iucv->msg_sent); + goto fail; + } + goto release; + } skb_queue_tail(&iucv->send_skb_q, skb); if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) @@ -1028,6 +1220,7 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock, goto fail; } +release: release_sock(sk); return len; @@ -1160,7 +1353,8 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct sock *sk = sock->sk; struct iucv_sock *iucv = iucv_sk(sk); unsigned int copied, rlen; - struct sk_buff *skb, *rskb, *cskb; + struct sk_buff *skb, *rskb, *cskb, *sskb; + int blen; int err = 0; if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) && @@ -1185,7 +1379,7 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, copied = min_t(unsigned int, rlen, len); cskb = skb; - if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { + if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { if (!(flags & MSG_PEEK)) skb_queue_head(&sk->sk_receive_queue, skb); return -EFAULT; @@ -1223,6 +1417,7 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, } kfree_skb(skb); + atomic_inc(&iucv->msg_recv); /* Queue backlog skbs */ spin_lock_bh(&iucv->message_q.lock); @@ -1239,6 +1434,24 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, if (skb_queue_empty(&iucv->backlog_skb_q)) { if (!list_empty(&iucv->message_q.list)) 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, + sizeof(struct af_iucv_trans_hdr) + + ETH_HLEN); + err = afiucv_hs_send(NULL, sk, sskb, + AF_IUCV_FLAG_WIN); + } + if (err) { + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + } + } } spin_unlock_bh(&iucv->message_q.lock); } @@ -1698,6 +1911,389 @@ static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) bh_unlock_sock(sk); } +/***************** HiperSockets transport callbacks ********************/ +static void afiucv_swap_src_dest(struct sk_buff *skb) +{ + struct af_iucv_trans_hdr *trans_hdr = + (struct af_iucv_trans_hdr *)skb->data; + char tmpID[8]; + char tmpName[8]; + + ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); + ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); + ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); + ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); + memcpy(tmpID, trans_hdr->srcUserID, 8); + memcpy(tmpName, trans_hdr->srcAppName, 8); + memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); + memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); + memcpy(trans_hdr->destUserID, tmpID, 8); + memcpy(trans_hdr->destAppName, tmpName, 8); + skb_push(skb, ETH_HLEN); + memset(skb->data, 0, ETH_HLEN); +} + +/** + * afiucv_hs_callback_syn - react on received SYN + **/ +static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) +{ + struct sock *nsk; + struct iucv_sock *iucv, *niucv; + struct af_iucv_trans_hdr *trans_hdr; + int err; + + iucv = iucv_sk(sk); + trans_hdr = (struct af_iucv_trans_hdr *)skb->data; + if (!iucv) { + /* no sock - connection refused */ + afiucv_swap_src_dest(skb); + trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; + err = dev_queue_xmit(skb); + goto out; + } + + nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC); + bh_lock_sock(sk); + if ((sk->sk_state != IUCV_LISTEN) || + sk_acceptq_is_full(sk) || + !nsk) { + /* error on server socket - connection refused */ + if (nsk) + sk_free(nsk); + afiucv_swap_src_dest(skb); + trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; + err = dev_queue_xmit(skb); + bh_unlock_sock(sk); + goto out; + } + + niucv = iucv_sk(nsk); + iucv_sock_init(nsk, sk); + niucv->transport = AF_IUCV_TRANS_HIPER; + niucv->msglimit = iucv->msglimit; + if (!trans_hdr->window) + niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; + else + niucv->msglimit_peer = trans_hdr->window; + memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); + memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); + memcpy(niucv->src_name, iucv->src_name, 8); + memcpy(niucv->src_user_id, iucv->src_user_id, 8); + nsk->sk_bound_dev_if = sk->sk_bound_dev_if; + afiucv_swap_src_dest(skb); + trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; + trans_hdr->window = niucv->msglimit; + /* if receiver acks the xmit connection is established */ + err = dev_queue_xmit(skb); + if (!err) { + iucv_accept_enqueue(sk, nsk); + nsk->sk_state = IUCV_CONNECTED; + sk->sk_data_ready(sk, 1); + } else + iucv_sock_kill(nsk); + bh_unlock_sock(sk); + +out: + return NET_RX_SUCCESS; +} + +/** + * afiucv_hs_callback_synack() - react on received SYN-ACK + **/ +static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) +{ + struct iucv_sock *iucv = iucv_sk(sk); + struct af_iucv_trans_hdr *trans_hdr = + (struct af_iucv_trans_hdr *)skb->data; + + if (!iucv) + goto out; + if (sk->sk_state != IUCV_BOUND) + goto out; + bh_lock_sock(sk); + iucv->msglimit_peer = trans_hdr->window; + sk->sk_state = IUCV_CONNECTED; + sk->sk_state_change(sk); + bh_unlock_sock(sk); +out: + kfree_skb(skb); + return NET_RX_SUCCESS; +} + +/** + * afiucv_hs_callback_synfin() - react on received SYN_FIN + **/ +static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) +{ + struct iucv_sock *iucv = iucv_sk(sk); + + if (!iucv) + goto out; + if (sk->sk_state != IUCV_BOUND) + goto out; + bh_lock_sock(sk); + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + bh_unlock_sock(sk); +out: + kfree_skb(skb); + return NET_RX_SUCCESS; +} + +/** + * afiucv_hs_callback_fin() - react on received FIN + **/ +static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) +{ + struct iucv_sock *iucv = iucv_sk(sk); + + /* other end of connection closed */ + if (iucv) { + bh_lock_sock(sk); + if (!list_empty(&iucv->accept_q)) + sk->sk_state = IUCV_SEVERED; + else + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + bh_unlock_sock(sk); + } + kfree_skb(skb); + return NET_RX_SUCCESS; +} + +/** + * afiucv_hs_callback_win() - react on received WIN + **/ +static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) +{ + struct iucv_sock *iucv = iucv_sk(sk); + struct af_iucv_trans_hdr *trans_hdr = + (struct af_iucv_trans_hdr *)skb->data; + + if (!iucv) + return NET_RX_SUCCESS; + + if (sk->sk_state != IUCV_CONNECTED) + return NET_RX_SUCCESS; + + atomic_sub(trans_hdr->window, &iucv->msg_sent); + iucv_sock_wake_msglim(sk); + return NET_RX_SUCCESS; +} + +/** + * afiucv_hs_callback_rx() - react on received data + **/ +static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) +{ + struct iucv_sock *iucv = iucv_sk(sk); + + if (!iucv) { + kfree_skb(skb); + return NET_RX_SUCCESS; + } + + if (sk->sk_state != IUCV_CONNECTED) { + kfree_skb(skb); + return NET_RX_SUCCESS; + } + + /* write stuff from iucv_msg to skb cb */ + if (skb->len <= sizeof(struct af_iucv_trans_hdr)) { + kfree_skb(skb); + return NET_RX_SUCCESS; + } + skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); + skb_reset_transport_header(skb); + skb_reset_network_header(skb); + spin_lock(&iucv->message_q.lock); + if (skb_queue_empty(&iucv->backlog_skb_q)) { + if (sock_queue_rcv_skb(sk, skb)) { + /* handle rcv queue full */ + skb_queue_tail(&iucv->backlog_skb_q, skb); + } + } else + skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); + spin_unlock(&iucv->message_q.lock); + return NET_RX_SUCCESS; +} + +/** + * afiucv_hs_rcv() - base function for arriving data through HiperSockets + * transport + * called from netif RX softirq + **/ +static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct hlist_node *node; + struct sock *sk; + struct iucv_sock *iucv; + struct af_iucv_trans_hdr *trans_hdr; + char nullstring[8]; + int err = 0; + + skb_pull(skb, ETH_HLEN); + trans_hdr = (struct af_iucv_trans_hdr *)skb->data; + EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); + EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); + EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); + EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); + memset(nullstring, 0, sizeof(nullstring)); + iucv = NULL; + sk = NULL; + read_lock(&iucv_sk_list.lock); + sk_for_each(sk, node, &iucv_sk_list.head) { + if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { + if ((!memcmp(&iucv_sk(sk)->src_name, + trans_hdr->destAppName, 8)) && + (!memcmp(&iucv_sk(sk)->src_user_id, + trans_hdr->destUserID, 8)) && + (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && + (!memcmp(&iucv_sk(sk)->dst_user_id, + nullstring, 8))) { + iucv = iucv_sk(sk); + break; + } + } else { + if ((!memcmp(&iucv_sk(sk)->src_name, + trans_hdr->destAppName, 8)) && + (!memcmp(&iucv_sk(sk)->src_user_id, + trans_hdr->destUserID, 8)) && + (!memcmp(&iucv_sk(sk)->dst_name, + trans_hdr->srcAppName, 8)) && + (!memcmp(&iucv_sk(sk)->dst_user_id, + trans_hdr->srcUserID, 8))) { + iucv = iucv_sk(sk); + break; + } + } + } + read_unlock(&iucv_sk_list.lock); + if (!iucv) + sk = NULL; + + /* no sock + how should we send with no sock + 1) send without sock no send rc checking? + 2) introduce default sock to handle this cases + + SYN -> send SYN|ACK in good case, send SYN|FIN in bad case + data -> send FIN + SYN|ACK, SYN|FIN, FIN -> no action? */ + + switch (trans_hdr->flags) { + case AF_IUCV_FLAG_SYN: + /* connect request */ + err = afiucv_hs_callback_syn(sk, skb); + break; + case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): + /* connect request confirmed */ + err = afiucv_hs_callback_synack(sk, skb); + break; + case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): + /* connect request refused */ + err = afiucv_hs_callback_synfin(sk, skb); + break; + case (AF_IUCV_FLAG_FIN): + /* close request */ + err = afiucv_hs_callback_fin(sk, skb); + break; + case (AF_IUCV_FLAG_WIN): + err = afiucv_hs_callback_win(sk, skb); + if (skb->len > sizeof(struct af_iucv_trans_hdr)) + err = afiucv_hs_callback_rx(sk, skb); + else + kfree(skb); + break; + case 0: + /* plain data frame */ + err = afiucv_hs_callback_rx(sk, skb); + break; + default: + ; + } + + return err; +} + +/** + * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets + * transport + **/ +static void afiucv_hs_callback_txnotify(struct sk_buff *skb, + enum iucv_tx_notify n) +{ + struct sock *isk = skb->sk; + struct sock *sk = NULL; + struct iucv_sock *iucv = NULL; + struct sk_buff_head *list; + struct sk_buff *list_skb; + struct sk_buff *this = NULL; + unsigned long flags; + struct hlist_node *node; + + read_lock(&iucv_sk_list.lock); + sk_for_each(sk, node, &iucv_sk_list.head) + if (sk == isk) { + iucv = iucv_sk(sk); + break; + } + read_unlock(&iucv_sk_list.lock); + + if (!iucv) + return; + + bh_lock_sock(sk); + list = &iucv->send_skb_q; + list_skb = list->next; + if (skb_queue_empty(list)) + goto out_unlock; + + spin_lock_irqsave(&list->lock, flags); + while (list_skb != (struct sk_buff *)list) { + if (skb_shinfo(list_skb) == skb_shinfo(skb)) { + this = list_skb; + switch (n) { + case TX_NOTIFY_OK: + __skb_unlink(this, list); + iucv_sock_wake_msglim(sk); + kfree_skb(this); + break; + case TX_NOTIFY_PENDING: + atomic_inc(&iucv->pendings); + break; + case TX_NOTIFY_DELAYED_OK: + __skb_unlink(this, list); + atomic_dec(&iucv->pendings); + if (atomic_read(&iucv->pendings) <= 0) + iucv_sock_wake_msglim(sk); + kfree_skb(this); + break; + case TX_NOTIFY_UNREACHABLE: + case TX_NOTIFY_DELAYED_UNREACHABLE: + case TX_NOTIFY_TPQFULL: /* not yet used */ + case TX_NOTIFY_GENERALERROR: + case TX_NOTIFY_DELAYED_GENERALERROR: + __skb_unlink(this, list); + kfree_skb(this); + if (!list_empty(&iucv->accept_q)) + sk->sk_state = IUCV_SEVERED; + else + sk->sk_state = IUCV_DISCONN; + sk->sk_state_change(sk); + break; + } + break; + } + list_skb = list_skb->next; + } + spin_unlock_irqrestore(&list->lock, flags); + +out_unlock: + bh_unlock_sock(sk); +} static const struct proto_ops iucv_sock_ops = { .family = PF_IUCV, .owner = THIS_MODULE, @@ -1724,7 +2320,12 @@ static const struct net_proto_family iucv_sock_family_ops = { .create = iucv_sock_create, }; -static int __init afiucv_iucv_init(void) +static struct packet_type iucv_packet_type = { + .type = cpu_to_be16(ETH_P_AF_IUCV), + .func = afiucv_hs_rcv, +}; + +static int afiucv_iucv_init(void) { int err; @@ -1763,24 +2364,22 @@ static int __init afiucv_init(void) { int err; - if (!MACHINE_IS_VM) { - pr_err("The af_iucv module cannot be loaded" - " without z/VM\n"); - err = -EPROTONOSUPPORT; - goto out; - } - cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); - if (unlikely(err)) { - WARN_ON(err); - err = -EPROTONOSUPPORT; - goto out; - } + if (MACHINE_IS_VM) { + cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); + if (unlikely(err)) { + WARN_ON(err); + err = -EPROTONOSUPPORT; + goto out; + } - pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); - if (!pr_iucv) { - printk(KERN_WARNING "iucv_if lookup failed\n"); - err = -EPROTONOSUPPORT; - goto out; + pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); + if (!pr_iucv) { + printk(KERN_WARNING "iucv_if lookup failed\n"); + memset(&iucv_userid, 0, sizeof(iucv_userid)); + } + } else { + memset(&iucv_userid, 0, sizeof(iucv_userid)); + pr_iucv = NULL; } err = proto_register(&iucv_proto, 0); @@ -1790,10 +2389,12 @@ static int __init afiucv_init(void) if (err) goto out_proto; - err = afiucv_iucv_init(); - if (err) - goto out_sock; - + if (pr_iucv) { + err = afiucv_iucv_init(); + if (err) + goto out_sock; + } + dev_add_pack(&iucv_packet_type); return 0; out_sock: @@ -1808,10 +2409,13 @@ out: static void __exit afiucv_exit(void) { - device_unregister(af_iucv_dev); - driver_unregister(&af_iucv_driver); - pr_iucv->iucv_unregister(&af_iucv_handler, 0); - symbol_put(iucv_if); + if (pr_iucv) { + device_unregister(af_iucv_dev); + driver_unregister(&af_iucv_driver); + pr_iucv->iucv_unregister(&af_iucv_handler, 0); + symbol_put(iucv_if); + } + dev_remove_pack(&iucv_packet_type); sock_unregister(PF_IUCV); proto_unregister(&iucv_proto); } @@ -1824,3 +2428,4 @@ MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); MODULE_VERSION(VERSION); MODULE_LICENSE("GPL"); MODULE_ALIAS_NETPROTO(PF_IUCV); + |
