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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/rds/af_rds.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/rds/af_rds.c')
-rw-r--r--net/rds/af_rds.c963
1 files changed, 963 insertions, 0 deletions
diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
new file mode 100644
index 000000000..d107f7605
--- /dev/null
+++ b/net/rds/af_rds.c
@@ -0,0 +1,963 @@
+/*
+ * Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/in.h>
+#include <linux/ipv6.h>
+#include <linux/poll.h>
+#include <net/sock.h>
+
+#include "rds.h"
+
+/* this is just used for stats gathering :/ */
+static DEFINE_SPINLOCK(rds_sock_lock);
+static unsigned long rds_sock_count;
+static LIST_HEAD(rds_sock_list);
+DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq);
+
+/*
+ * This is called as the final descriptor referencing this socket is closed.
+ * We have to unbind the socket so that another socket can be bound to the
+ * address it was using.
+ *
+ * We have to be careful about racing with the incoming path. sock_orphan()
+ * sets SOCK_DEAD and we use that as an indicator to the rx path that new
+ * messages shouldn't be queued.
+ */
+static int rds_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ struct rds_sock *rs;
+
+ if (!sk)
+ goto out;
+
+ rs = rds_sk_to_rs(sk);
+
+ sock_orphan(sk);
+ /* Note - rds_clear_recv_queue grabs rs_recv_lock, so
+ * that ensures the recv path has completed messing
+ * with the socket. */
+ rds_clear_recv_queue(rs);
+ rds_cong_remove_socket(rs);
+
+ rds_remove_bound(rs);
+
+ rds_send_drop_to(rs, NULL);
+ rds_rdma_drop_keys(rs);
+ rds_notify_queue_get(rs, NULL);
+ rds_notify_msg_zcopy_purge(&rs->rs_zcookie_queue);
+
+ spin_lock_bh(&rds_sock_lock);
+ list_del_init(&rs->rs_item);
+ rds_sock_count--;
+ spin_unlock_bh(&rds_sock_lock);
+
+ rds_trans_put(rs->rs_transport);
+
+ sock->sk = NULL;
+ sock_put(sk);
+out:
+ return 0;
+}
+
+/*
+ * Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
+ * _bh() isn't OK here, we're called from interrupt handlers. It's probably OK
+ * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
+ * this seems more conservative.
+ * NB - normally, one would use sk_callback_lock for this, but we can
+ * get here from interrupts, whereas the network code grabs sk_callback_lock
+ * with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
+ */
+void rds_wake_sk_sleep(struct rds_sock *rs)
+{
+ unsigned long flags;
+
+ read_lock_irqsave(&rs->rs_recv_lock, flags);
+ __rds_wake_sk_sleep(rds_rs_to_sk(rs));
+ read_unlock_irqrestore(&rs->rs_recv_lock, flags);
+}
+
+static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
+ int peer)
+{
+ struct rds_sock *rs = rds_sk_to_rs(sock->sk);
+ struct sockaddr_in6 *sin6;
+ struct sockaddr_in *sin;
+ int uaddr_len;
+
+ /* racey, don't care */
+ if (peer) {
+ if (ipv6_addr_any(&rs->rs_conn_addr))
+ return -ENOTCONN;
+
+ if (ipv6_addr_v4mapped(&rs->rs_conn_addr)) {
+ sin = (struct sockaddr_in *)uaddr;
+ memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+ sin->sin_family = AF_INET;
+ sin->sin_port = rs->rs_conn_port;
+ sin->sin_addr.s_addr = rs->rs_conn_addr_v4;
+ uaddr_len = sizeof(*sin);
+ } else {
+ sin6 = (struct sockaddr_in6 *)uaddr;
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = rs->rs_conn_port;
+ sin6->sin6_addr = rs->rs_conn_addr;
+ sin6->sin6_flowinfo = 0;
+ /* scope_id is the same as in the bound address. */
+ sin6->sin6_scope_id = rs->rs_bound_scope_id;
+ uaddr_len = sizeof(*sin6);
+ }
+ } else {
+ /* If socket is not yet bound and the socket is connected,
+ * set the return address family to be the same as the
+ * connected address, but with 0 address value. If it is not
+ * connected, set the family to be AF_UNSPEC (value 0) and
+ * the address size to be that of an IPv4 address.
+ */
+ if (ipv6_addr_any(&rs->rs_bound_addr)) {
+ if (ipv6_addr_any(&rs->rs_conn_addr)) {
+ sin = (struct sockaddr_in *)uaddr;
+ memset(sin, 0, sizeof(*sin));
+ sin->sin_family = AF_UNSPEC;
+ return sizeof(*sin);
+ }
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (!(ipv6_addr_type(&rs->rs_conn_addr) &
+ IPV6_ADDR_MAPPED)) {
+ sin6 = (struct sockaddr_in6 *)uaddr;
+ memset(sin6, 0, sizeof(*sin6));
+ sin6->sin6_family = AF_INET6;
+ return sizeof(*sin6);
+ }
+#endif
+
+ sin = (struct sockaddr_in *)uaddr;
+ memset(sin, 0, sizeof(*sin));
+ sin->sin_family = AF_INET;
+ return sizeof(*sin);
+ }
+ if (ipv6_addr_v4mapped(&rs->rs_bound_addr)) {
+ sin = (struct sockaddr_in *)uaddr;
+ memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+ sin->sin_family = AF_INET;
+ sin->sin_port = rs->rs_bound_port;
+ sin->sin_addr.s_addr = rs->rs_bound_addr_v4;
+ uaddr_len = sizeof(*sin);
+ } else {
+ sin6 = (struct sockaddr_in6 *)uaddr;
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = rs->rs_bound_port;
+ sin6->sin6_addr = rs->rs_bound_addr;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = rs->rs_bound_scope_id;
+ uaddr_len = sizeof(*sin6);
+ }
+ }
+
+ return uaddr_len;
+}
+
+/*
+ * RDS' poll is without a doubt the least intuitive part of the interface,
+ * as EPOLLIN and EPOLLOUT do not behave entirely as you would expect from
+ * a network protocol.
+ *
+ * EPOLLIN is asserted if
+ * - there is data on the receive queue.
+ * - to signal that a previously congested destination may have become
+ * uncongested
+ * - A notification has been queued to the socket (this can be a congestion
+ * update, or a RDMA completion, or a MSG_ZEROCOPY completion).
+ *
+ * EPOLLOUT is asserted if there is room on the send queue. This does not mean
+ * however, that the next sendmsg() call will succeed. If the application tries
+ * to send to a congested destination, the system call may still fail (and
+ * return ENOBUFS).
+ */
+static __poll_t rds_poll(struct file *file, struct socket *sock,
+ poll_table *wait)
+{
+ struct sock *sk = sock->sk;
+ struct rds_sock *rs = rds_sk_to_rs(sk);
+ __poll_t mask = 0;
+ unsigned long flags;
+
+ poll_wait(file, sk_sleep(sk), wait);
+
+ if (rs->rs_seen_congestion)
+ poll_wait(file, &rds_poll_waitq, wait);
+
+ read_lock_irqsave(&rs->rs_recv_lock, flags);
+ if (!rs->rs_cong_monitor) {
+ /* When a congestion map was updated, we signal EPOLLIN for
+ * "historical" reasons. Applications can also poll for
+ * WRBAND instead. */
+ if (rds_cong_updated_since(&rs->rs_cong_track))
+ mask |= (EPOLLIN | EPOLLRDNORM | EPOLLWRBAND);
+ } else {
+ spin_lock(&rs->rs_lock);
+ if (rs->rs_cong_notify)
+ mask |= (EPOLLIN | EPOLLRDNORM);
+ spin_unlock(&rs->rs_lock);
+ }
+ if (!list_empty(&rs->rs_recv_queue) ||
+ !list_empty(&rs->rs_notify_queue) ||
+ !list_empty(&rs->rs_zcookie_queue.zcookie_head))
+ mask |= (EPOLLIN | EPOLLRDNORM);
+ if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
+ mask |= (EPOLLOUT | EPOLLWRNORM);
+ if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
+ mask |= POLLERR;
+ read_unlock_irqrestore(&rs->rs_recv_lock, flags);
+
+ /* clear state any time we wake a seen-congested socket */
+ if (mask)
+ rs->rs_seen_congestion = 0;
+
+ return mask;
+}
+
+static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ struct rds_sock *rs = rds_sk_to_rs(sock->sk);
+ rds_tos_t utos, tos = 0;
+
+ switch (cmd) {
+ case SIOCRDSSETTOS:
+ if (get_user(utos, (rds_tos_t __user *)arg))
+ return -EFAULT;
+
+ if (rs->rs_transport &&
+ rs->rs_transport->get_tos_map)
+ tos = rs->rs_transport->get_tos_map(utos);
+ else
+ return -ENOIOCTLCMD;
+
+ spin_lock_bh(&rds_sock_lock);
+ if (rs->rs_tos || rs->rs_conn) {
+ spin_unlock_bh(&rds_sock_lock);
+ return -EINVAL;
+ }
+ rs->rs_tos = tos;
+ spin_unlock_bh(&rds_sock_lock);
+ break;
+ case SIOCRDSGETTOS:
+ spin_lock_bh(&rds_sock_lock);
+ tos = rs->rs_tos;
+ spin_unlock_bh(&rds_sock_lock);
+ if (put_user(tos, (rds_tos_t __user *)arg))
+ return -EFAULT;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return 0;
+}
+
+static int rds_cancel_sent_to(struct rds_sock *rs, sockptr_t optval, int len)
+{
+ struct sockaddr_in6 sin6;
+ struct sockaddr_in sin;
+ int ret = 0;
+
+ /* racing with another thread binding seems ok here */
+ if (ipv6_addr_any(&rs->rs_bound_addr)) {
+ ret = -ENOTCONN; /* XXX not a great errno */
+ goto out;
+ }
+
+ if (len < sizeof(struct sockaddr_in)) {
+ ret = -EINVAL;
+ goto out;
+ } else if (len < sizeof(struct sockaddr_in6)) {
+ /* Assume IPv4 */
+ if (copy_from_sockptr(&sin, optval,
+ sizeof(struct sockaddr_in))) {
+ ret = -EFAULT;
+ goto out;
+ }
+ ipv6_addr_set_v4mapped(sin.sin_addr.s_addr, &sin6.sin6_addr);
+ sin6.sin6_port = sin.sin_port;
+ } else {
+ if (copy_from_sockptr(&sin6, optval,
+ sizeof(struct sockaddr_in6))) {
+ ret = -EFAULT;
+ goto out;
+ }
+ }
+
+ rds_send_drop_to(rs, &sin6);
+out:
+ return ret;
+}
+
+static int rds_set_bool_option(unsigned char *optvar, sockptr_t optval,
+ int optlen)
+{
+ int value;
+
+ if (optlen < sizeof(int))
+ return -EINVAL;
+ if (copy_from_sockptr(&value, optval, sizeof(int)))
+ return -EFAULT;
+ *optvar = !!value;
+ return 0;
+}
+
+static int rds_cong_monitor(struct rds_sock *rs, sockptr_t optval, int optlen)
+{
+ int ret;
+
+ ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
+ if (ret == 0) {
+ if (rs->rs_cong_monitor) {
+ rds_cong_add_socket(rs);
+ } else {
+ rds_cong_remove_socket(rs);
+ rs->rs_cong_mask = 0;
+ rs->rs_cong_notify = 0;
+ }
+ }
+ return ret;
+}
+
+static int rds_set_transport(struct rds_sock *rs, sockptr_t optval, int optlen)
+{
+ int t_type;
+
+ if (rs->rs_transport)
+ return -EOPNOTSUPP; /* previously attached to transport */
+
+ if (optlen != sizeof(int))
+ return -EINVAL;
+
+ if (copy_from_sockptr(&t_type, optval, sizeof(t_type)))
+ return -EFAULT;
+
+ if (t_type < 0 || t_type >= RDS_TRANS_COUNT)
+ return -EINVAL;
+
+ rs->rs_transport = rds_trans_get(t_type);
+
+ return rs->rs_transport ? 0 : -ENOPROTOOPT;
+}
+
+static int rds_enable_recvtstamp(struct sock *sk, sockptr_t optval,
+ int optlen, int optname)
+{
+ int val, valbool;
+
+ if (optlen != sizeof(int))
+ return -EFAULT;
+
+ if (copy_from_sockptr(&val, optval, sizeof(int)))
+ return -EFAULT;
+
+ valbool = val ? 1 : 0;
+
+ if (optname == SO_TIMESTAMP_NEW)
+ sock_set_flag(sk, SOCK_TSTAMP_NEW);
+
+ if (valbool)
+ sock_set_flag(sk, SOCK_RCVTSTAMP);
+ else
+ sock_reset_flag(sk, SOCK_RCVTSTAMP);
+
+ return 0;
+}
+
+static int rds_recv_track_latency(struct rds_sock *rs, sockptr_t optval,
+ int optlen)
+{
+ struct rds_rx_trace_so trace;
+ int i;
+
+ if (optlen != sizeof(struct rds_rx_trace_so))
+ return -EFAULT;
+
+ if (copy_from_sockptr(&trace, optval, sizeof(trace)))
+ return -EFAULT;
+
+ if (trace.rx_traces > RDS_MSG_RX_DGRAM_TRACE_MAX)
+ return -EFAULT;
+
+ rs->rs_rx_traces = trace.rx_traces;
+ for (i = 0; i < rs->rs_rx_traces; i++) {
+ if (trace.rx_trace_pos[i] >= RDS_MSG_RX_DGRAM_TRACE_MAX) {
+ rs->rs_rx_traces = 0;
+ return -EFAULT;
+ }
+ rs->rs_rx_trace[i] = trace.rx_trace_pos[i];
+ }
+
+ return 0;
+}
+
+static int rds_setsockopt(struct socket *sock, int level, int optname,
+ sockptr_t optval, unsigned int optlen)
+{
+ struct rds_sock *rs = rds_sk_to_rs(sock->sk);
+ int ret;
+
+ if (level != SOL_RDS) {
+ ret = -ENOPROTOOPT;
+ goto out;
+ }
+
+ switch (optname) {
+ case RDS_CANCEL_SENT_TO:
+ ret = rds_cancel_sent_to(rs, optval, optlen);
+ break;
+ case RDS_GET_MR:
+ ret = rds_get_mr(rs, optval, optlen);
+ break;
+ case RDS_GET_MR_FOR_DEST:
+ ret = rds_get_mr_for_dest(rs, optval, optlen);
+ break;
+ case RDS_FREE_MR:
+ ret = rds_free_mr(rs, optval, optlen);
+ break;
+ case RDS_RECVERR:
+ ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
+ break;
+ case RDS_CONG_MONITOR:
+ ret = rds_cong_monitor(rs, optval, optlen);
+ break;
+ case SO_RDS_TRANSPORT:
+ lock_sock(sock->sk);
+ ret = rds_set_transport(rs, optval, optlen);
+ release_sock(sock->sk);
+ break;
+ case SO_TIMESTAMP_OLD:
+ case SO_TIMESTAMP_NEW:
+ lock_sock(sock->sk);
+ ret = rds_enable_recvtstamp(sock->sk, optval, optlen, optname);
+ release_sock(sock->sk);
+ break;
+ case SO_RDS_MSG_RXPATH_LATENCY:
+ ret = rds_recv_track_latency(rs, optval, optlen);
+ break;
+ default:
+ ret = -ENOPROTOOPT;
+ }
+out:
+ return ret;
+}
+
+static int rds_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct rds_sock *rs = rds_sk_to_rs(sock->sk);
+ int ret = -ENOPROTOOPT, len;
+ int trans;
+
+ if (level != SOL_RDS)
+ goto out;
+
+ if (get_user(len, optlen)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ switch (optname) {
+ case RDS_INFO_FIRST ... RDS_INFO_LAST:
+ ret = rds_info_getsockopt(sock, optname, optval,
+ optlen);
+ break;
+
+ case RDS_RECVERR:
+ if (len < sizeof(int))
+ ret = -EINVAL;
+ else
+ if (put_user(rs->rs_recverr, (int __user *) optval) ||
+ put_user(sizeof(int), optlen))
+ ret = -EFAULT;
+ else
+ ret = 0;
+ break;
+ case SO_RDS_TRANSPORT:
+ if (len < sizeof(int)) {
+ ret = -EINVAL;
+ break;
+ }
+ trans = (rs->rs_transport ? rs->rs_transport->t_type :
+ RDS_TRANS_NONE); /* unbound */
+ if (put_user(trans, (int __user *)optval) ||
+ put_user(sizeof(int), optlen))
+ ret = -EFAULT;
+ else
+ ret = 0;
+ break;
+ default:
+ break;
+ }
+
+out:
+ return ret;
+
+}
+
+static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
+ int addr_len, int flags)
+{
+ struct sock *sk = sock->sk;
+ struct sockaddr_in *sin;
+ struct rds_sock *rs = rds_sk_to_rs(sk);
+ int ret = 0;
+
+ if (addr_len < offsetofend(struct sockaddr, sa_family))
+ return -EINVAL;
+
+ lock_sock(sk);
+
+ switch (uaddr->sa_family) {
+ case AF_INET:
+ sin = (struct sockaddr_in *)uaddr;
+ if (addr_len < sizeof(struct sockaddr_in)) {
+ ret = -EINVAL;
+ break;
+ }
+ if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
+ ret = -EDESTADDRREQ;
+ break;
+ }
+ if (ipv4_is_multicast(sin->sin_addr.s_addr) ||
+ sin->sin_addr.s_addr == htonl(INADDR_BROADCAST)) {
+ ret = -EINVAL;
+ break;
+ }
+ ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &rs->rs_conn_addr);
+ rs->rs_conn_port = sin->sin_port;
+ break;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ case AF_INET6: {
+ struct sockaddr_in6 *sin6;
+ int addr_type;
+
+ sin6 = (struct sockaddr_in6 *)uaddr;
+ if (addr_len < sizeof(struct sockaddr_in6)) {
+ ret = -EINVAL;
+ break;
+ }
+ addr_type = ipv6_addr_type(&sin6->sin6_addr);
+ if (!(addr_type & IPV6_ADDR_UNICAST)) {
+ __be32 addr4;
+
+ if (!(addr_type & IPV6_ADDR_MAPPED)) {
+ ret = -EPROTOTYPE;
+ break;
+ }
+
+ /* It is a mapped address. Need to do some sanity
+ * checks.
+ */
+ addr4 = sin6->sin6_addr.s6_addr32[3];
+ if (addr4 == htonl(INADDR_ANY) ||
+ addr4 == htonl(INADDR_BROADCAST) ||
+ ipv4_is_multicast(addr4)) {
+ ret = -EPROTOTYPE;
+ break;
+ }
+ }
+
+ if (addr_type & IPV6_ADDR_LINKLOCAL) {
+ /* If socket is arleady bound to a link local address,
+ * the peer address must be on the same link.
+ */
+ if (sin6->sin6_scope_id == 0 ||
+ (!ipv6_addr_any(&rs->rs_bound_addr) &&
+ rs->rs_bound_scope_id &&
+ sin6->sin6_scope_id != rs->rs_bound_scope_id)) {
+ ret = -EINVAL;
+ break;
+ }
+ /* Remember the connected address scope ID. It will
+ * be checked against the binding local address when
+ * the socket is bound.
+ */
+ rs->rs_bound_scope_id = sin6->sin6_scope_id;
+ }
+ rs->rs_conn_addr = sin6->sin6_addr;
+ rs->rs_conn_port = sin6->sin6_port;
+ break;
+ }
+#endif
+
+ default:
+ ret = -EAFNOSUPPORT;
+ break;
+ }
+
+ release_sock(sk);
+ return ret;
+}
+
+static struct proto rds_proto = {
+ .name = "RDS",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct rds_sock),
+};
+
+static const struct proto_ops rds_proto_ops = {
+ .family = AF_RDS,
+ .owner = THIS_MODULE,
+ .release = rds_release,
+ .bind = rds_bind,
+ .connect = rds_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = rds_getname,
+ .poll = rds_poll,
+ .ioctl = rds_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = rds_setsockopt,
+ .getsockopt = rds_getsockopt,
+ .sendmsg = rds_sendmsg,
+ .recvmsg = rds_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+};
+
+static void rds_sock_destruct(struct sock *sk)
+{
+ struct rds_sock *rs = rds_sk_to_rs(sk);
+
+ WARN_ON((&rs->rs_item != rs->rs_item.next ||
+ &rs->rs_item != rs->rs_item.prev));
+}
+
+static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
+{
+ struct rds_sock *rs;
+
+ sock_init_data(sock, sk);
+ sock->ops = &rds_proto_ops;
+ sk->sk_protocol = protocol;
+ sk->sk_destruct = rds_sock_destruct;
+
+ rs = rds_sk_to_rs(sk);
+ spin_lock_init(&rs->rs_lock);
+ rwlock_init(&rs->rs_recv_lock);
+ INIT_LIST_HEAD(&rs->rs_send_queue);
+ INIT_LIST_HEAD(&rs->rs_recv_queue);
+ INIT_LIST_HEAD(&rs->rs_notify_queue);
+ INIT_LIST_HEAD(&rs->rs_cong_list);
+ rds_message_zcopy_queue_init(&rs->rs_zcookie_queue);
+ spin_lock_init(&rs->rs_rdma_lock);
+ rs->rs_rdma_keys = RB_ROOT;
+ rs->rs_rx_traces = 0;
+ rs->rs_tos = 0;
+ rs->rs_conn = NULL;
+
+ spin_lock_bh(&rds_sock_lock);
+ list_add_tail(&rs->rs_item, &rds_sock_list);
+ rds_sock_count++;
+ spin_unlock_bh(&rds_sock_lock);
+
+ return 0;
+}
+
+static int rds_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct sock *sk;
+
+ if (sock->type != SOCK_SEQPACKET || protocol)
+ return -ESOCKTNOSUPPORT;
+
+ sk = sk_alloc(net, AF_RDS, GFP_KERNEL, &rds_proto, kern);
+ if (!sk)
+ return -ENOMEM;
+
+ return __rds_create(sock, sk, protocol);
+}
+
+void rds_sock_addref(struct rds_sock *rs)
+{
+ sock_hold(rds_rs_to_sk(rs));
+}
+
+void rds_sock_put(struct rds_sock *rs)
+{
+ sock_put(rds_rs_to_sk(rs));
+}
+
+static const struct net_proto_family rds_family_ops = {
+ .family = AF_RDS,
+ .create = rds_create,
+ .owner = THIS_MODULE,
+};
+
+static void rds_sock_inc_info(struct socket *sock, unsigned int len,
+ struct rds_info_iterator *iter,
+ struct rds_info_lengths *lens)
+{
+ struct rds_sock *rs;
+ struct rds_incoming *inc;
+ unsigned int total = 0;
+
+ len /= sizeof(struct rds_info_message);
+
+ spin_lock_bh(&rds_sock_lock);
+
+ list_for_each_entry(rs, &rds_sock_list, rs_item) {
+ /* This option only supports IPv4 sockets. */
+ if (!ipv6_addr_v4mapped(&rs->rs_bound_addr))
+ continue;
+
+ read_lock(&rs->rs_recv_lock);
+
+ /* XXX too lazy to maintain counts.. */
+ list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
+ total++;
+ if (total <= len)
+ rds_inc_info_copy(inc, iter,
+ inc->i_saddr.s6_addr32[3],
+ rs->rs_bound_addr_v4,
+ 1);
+ }
+
+ read_unlock(&rs->rs_recv_lock);
+ }
+
+ spin_unlock_bh(&rds_sock_lock);
+
+ lens->nr = total;
+ lens->each = sizeof(struct rds_info_message);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void rds6_sock_inc_info(struct socket *sock, unsigned int len,
+ struct rds_info_iterator *iter,
+ struct rds_info_lengths *lens)
+{
+ struct rds_incoming *inc;
+ unsigned int total = 0;
+ struct rds_sock *rs;
+
+ len /= sizeof(struct rds6_info_message);
+
+ spin_lock_bh(&rds_sock_lock);
+
+ list_for_each_entry(rs, &rds_sock_list, rs_item) {
+ read_lock(&rs->rs_recv_lock);
+
+ list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
+ total++;
+ if (total <= len)
+ rds6_inc_info_copy(inc, iter, &inc->i_saddr,
+ &rs->rs_bound_addr, 1);
+ }
+
+ read_unlock(&rs->rs_recv_lock);
+ }
+
+ spin_unlock_bh(&rds_sock_lock);
+
+ lens->nr = total;
+ lens->each = sizeof(struct rds6_info_message);
+}
+#endif
+
+static void rds_sock_info(struct socket *sock, unsigned int len,
+ struct rds_info_iterator *iter,
+ struct rds_info_lengths *lens)
+{
+ struct rds_info_socket sinfo;
+ unsigned int cnt = 0;
+ struct rds_sock *rs;
+
+ len /= sizeof(struct rds_info_socket);
+
+ spin_lock_bh(&rds_sock_lock);
+
+ if (len < rds_sock_count) {
+ cnt = rds_sock_count;
+ goto out;
+ }
+
+ list_for_each_entry(rs, &rds_sock_list, rs_item) {
+ /* This option only supports IPv4 sockets. */
+ if (!ipv6_addr_v4mapped(&rs->rs_bound_addr))
+ continue;
+ sinfo.sndbuf = rds_sk_sndbuf(rs);
+ sinfo.rcvbuf = rds_sk_rcvbuf(rs);
+ sinfo.bound_addr = rs->rs_bound_addr_v4;
+ sinfo.connected_addr = rs->rs_conn_addr_v4;
+ sinfo.bound_port = rs->rs_bound_port;
+ sinfo.connected_port = rs->rs_conn_port;
+ sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
+
+ rds_info_copy(iter, &sinfo, sizeof(sinfo));
+ cnt++;
+ }
+
+out:
+ lens->nr = cnt;
+ lens->each = sizeof(struct rds_info_socket);
+
+ spin_unlock_bh(&rds_sock_lock);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void rds6_sock_info(struct socket *sock, unsigned int len,
+ struct rds_info_iterator *iter,
+ struct rds_info_lengths *lens)
+{
+ struct rds6_info_socket sinfo6;
+ struct rds_sock *rs;
+
+ len /= sizeof(struct rds6_info_socket);
+
+ spin_lock_bh(&rds_sock_lock);
+
+ if (len < rds_sock_count)
+ goto out;
+
+ list_for_each_entry(rs, &rds_sock_list, rs_item) {
+ sinfo6.sndbuf = rds_sk_sndbuf(rs);
+ sinfo6.rcvbuf = rds_sk_rcvbuf(rs);
+ sinfo6.bound_addr = rs->rs_bound_addr;
+ sinfo6.connected_addr = rs->rs_conn_addr;
+ sinfo6.bound_port = rs->rs_bound_port;
+ sinfo6.connected_port = rs->rs_conn_port;
+ sinfo6.inum = sock_i_ino(rds_rs_to_sk(rs));
+
+ rds_info_copy(iter, &sinfo6, sizeof(sinfo6));
+ }
+
+ out:
+ lens->nr = rds_sock_count;
+ lens->each = sizeof(struct rds6_info_socket);
+
+ spin_unlock_bh(&rds_sock_lock);
+}
+#endif
+
+static void rds_exit(void)
+{
+ sock_unregister(rds_family_ops.family);
+ proto_unregister(&rds_proto);
+ rds_conn_exit();
+ rds_cong_exit();
+ rds_sysctl_exit();
+ rds_threads_exit();
+ rds_stats_exit();
+ rds_page_exit();
+ rds_bind_lock_destroy();
+ rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
+ rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
+#if IS_ENABLED(CONFIG_IPV6)
+ rds_info_deregister_func(RDS6_INFO_SOCKETS, rds6_sock_info);
+ rds_info_deregister_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
+#endif
+}
+module_exit(rds_exit);
+
+u32 rds_gen_num;
+
+static int __init rds_init(void)
+{
+ int ret;
+
+ net_get_random_once(&rds_gen_num, sizeof(rds_gen_num));
+
+ ret = rds_bind_lock_init();
+ if (ret)
+ goto out;
+
+ ret = rds_conn_init();
+ if (ret)
+ goto out_bind;
+
+ ret = rds_threads_init();
+ if (ret)
+ goto out_conn;
+ ret = rds_sysctl_init();
+ if (ret)
+ goto out_threads;
+ ret = rds_stats_init();
+ if (ret)
+ goto out_sysctl;
+ ret = proto_register(&rds_proto, 1);
+ if (ret)
+ goto out_stats;
+ ret = sock_register(&rds_family_ops);
+ if (ret)
+ goto out_proto;
+
+ rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
+ rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
+#if IS_ENABLED(CONFIG_IPV6)
+ rds_info_register_func(RDS6_INFO_SOCKETS, rds6_sock_info);
+ rds_info_register_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
+#endif
+
+ goto out;
+
+out_proto:
+ proto_unregister(&rds_proto);
+out_stats:
+ rds_stats_exit();
+out_sysctl:
+ rds_sysctl_exit();
+out_threads:
+ rds_threads_exit();
+out_conn:
+ rds_conn_exit();
+ rds_cong_exit();
+ rds_page_exit();
+out_bind:
+ rds_bind_lock_destroy();
+out:
+ return ret;
+}
+module_init(rds_init);
+
+#define DRV_VERSION "4.0"
+#define DRV_RELDATE "Feb 12, 2009"
+
+MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
+MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
+ " v" DRV_VERSION " (" DRV_RELDATE ")");
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_ALIAS_NETPROTO(PF_RDS);