diff options
Diffstat (limited to '')
| -rw-r--r-- | net/sunrpc/xprtsock.c | 3242 |
1 files changed, 3242 insertions, 0 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c new file mode 100644 index 000000000..ae5b5380f --- /dev/null +++ b/net/sunrpc/xprtsock.c @@ -0,0 +1,3242 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/net/sunrpc/xprtsock.c + * + * Client-side transport implementation for sockets. + * + * TCP callback races fixes (C) 1998 Red Hat + * TCP send fixes (C) 1998 Red Hat + * TCP NFS related read + write fixes + * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> + * + * Rewrite of larges part of the code in order to stabilize TCP stuff. + * Fix behaviour when socket buffer is full. + * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> + * + * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> + * + * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. + * <gilles.quillard@bull.net> + */ + +#include <linux/types.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/capability.h> +#include <linux/pagemap.h> +#include <linux/errno.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/net.h> +#include <linux/mm.h> +#include <linux/un.h> +#include <linux/udp.h> +#include <linux/tcp.h> +#include <linux/sunrpc/clnt.h> +#include <linux/sunrpc/addr.h> +#include <linux/sunrpc/sched.h> +#include <linux/sunrpc/svcsock.h> +#include <linux/sunrpc/xprtsock.h> +#include <linux/file.h> +#ifdef CONFIG_SUNRPC_BACKCHANNEL +#include <linux/sunrpc/bc_xprt.h> +#endif + +#include <net/sock.h> +#include <net/checksum.h> +#include <net/udp.h> +#include <net/tcp.h> +#include <linux/bvec.h> +#include <linux/highmem.h> +#include <linux/uio.h> +#include <linux/sched/mm.h> + +#include <trace/events/sunrpc.h> + +#include "socklib.h" +#include "sunrpc.h" + +static void xs_close(struct rpc_xprt *xprt); +static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, + struct socket *sock); + +/* + * xprtsock tunables + */ +static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; +static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; +static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; + +static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; +static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; + +#define XS_TCP_LINGER_TO (15U * HZ) +static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; + +/* + * We can register our own files under /proc/sys/sunrpc by + * calling register_sysctl_table() again. The files in that + * directory become the union of all files registered there. + * + * We simply need to make sure that we don't collide with + * someone else's file names! + */ + +static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; +static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; +static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; +static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; +static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; + +static struct ctl_table_header *sunrpc_table_header; + +/* + * FIXME: changing the UDP slot table size should also resize the UDP + * socket buffers for existing UDP transports + */ +static struct ctl_table xs_tunables_table[] = { + { + .procname = "udp_slot_table_entries", + .data = &xprt_udp_slot_table_entries, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_slot_table_size, + .extra2 = &max_slot_table_size + }, + { + .procname = "tcp_slot_table_entries", + .data = &xprt_tcp_slot_table_entries, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_slot_table_size, + .extra2 = &max_slot_table_size + }, + { + .procname = "tcp_max_slot_table_entries", + .data = &xprt_max_tcp_slot_table_entries, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_slot_table_size, + .extra2 = &max_tcp_slot_table_limit + }, + { + .procname = "min_resvport", + .data = &xprt_min_resvport, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &xprt_min_resvport_limit, + .extra2 = &xprt_max_resvport_limit + }, + { + .procname = "max_resvport", + .data = &xprt_max_resvport, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &xprt_min_resvport_limit, + .extra2 = &xprt_max_resvport_limit + }, + { + .procname = "tcp_fin_timeout", + .data = &xs_tcp_fin_timeout, + .maxlen = sizeof(xs_tcp_fin_timeout), + .mode = 0644, + .proc_handler = proc_dointvec_jiffies, + }, + { }, +}; + +static struct ctl_table sunrpc_table[] = { + { + .procname = "sunrpc", + .mode = 0555, + .child = xs_tunables_table + }, + { }, +}; + +/* + * Wait duration for a reply from the RPC portmapper. + */ +#define XS_BIND_TO (60U * HZ) + +/* + * Delay if a UDP socket connect error occurs. This is most likely some + * kind of resource problem on the local host. + */ +#define XS_UDP_REEST_TO (2U * HZ) + +/* + * The reestablish timeout allows clients to delay for a bit before attempting + * to reconnect to a server that just dropped our connection. + * + * We implement an exponential backoff when trying to reestablish a TCP + * transport connection with the server. Some servers like to drop a TCP + * connection when they are overworked, so we start with a short timeout and + * increase over time if the server is down or not responding. + */ +#define XS_TCP_INIT_REEST_TO (3U * HZ) + +/* + * TCP idle timeout; client drops the transport socket if it is idle + * for this long. Note that we also timeout UDP sockets to prevent + * holding port numbers when there is no RPC traffic. + */ +#define XS_IDLE_DISC_TO (5U * 60 * HZ) + +#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) +# undef RPC_DEBUG_DATA +# define RPCDBG_FACILITY RPCDBG_TRANS +#endif + +#ifdef RPC_DEBUG_DATA +static void xs_pktdump(char *msg, u32 *packet, unsigned int count) +{ + u8 *buf = (u8 *) packet; + int j; + + dprintk("RPC: %s\n", msg); + for (j = 0; j < count && j < 128; j += 4) { + if (!(j & 31)) { + if (j) + dprintk("\n"); + dprintk("0x%04x ", j); + } + dprintk("%02x%02x%02x%02x ", + buf[j], buf[j+1], buf[j+2], buf[j+3]); + } + dprintk("\n"); +} +#else +static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) +{ + /* NOP */ +} +#endif + +static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) +{ + return (struct rpc_xprt *) sk->sk_user_data; +} + +static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) +{ + return (struct sockaddr *) &xprt->addr; +} + +static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) +{ + return (struct sockaddr_un *) &xprt->addr; +} + +static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) +{ + return (struct sockaddr_in *) &xprt->addr; +} + +static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) +{ + return (struct sockaddr_in6 *) &xprt->addr; +} + +static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) +{ + struct sockaddr *sap = xs_addr(xprt); + struct sockaddr_in6 *sin6; + struct sockaddr_in *sin; + struct sockaddr_un *sun; + char buf[128]; + + switch (sap->sa_family) { + case AF_LOCAL: + sun = xs_addr_un(xprt); + strlcpy(buf, sun->sun_path, sizeof(buf)); + xprt->address_strings[RPC_DISPLAY_ADDR] = + kstrdup(buf, GFP_KERNEL); + break; + case AF_INET: + (void)rpc_ntop(sap, buf, sizeof(buf)); + xprt->address_strings[RPC_DISPLAY_ADDR] = + kstrdup(buf, GFP_KERNEL); + sin = xs_addr_in(xprt); + snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); + break; + case AF_INET6: + (void)rpc_ntop(sap, buf, sizeof(buf)); + xprt->address_strings[RPC_DISPLAY_ADDR] = + kstrdup(buf, GFP_KERNEL); + sin6 = xs_addr_in6(xprt); + snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); + break; + default: + BUG(); + } + + xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); +} + +static void xs_format_common_peer_ports(struct rpc_xprt *xprt) +{ + struct sockaddr *sap = xs_addr(xprt); + char buf[128]; + + snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); + xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); + + snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); + xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); +} + +static void xs_format_peer_addresses(struct rpc_xprt *xprt, + const char *protocol, + const char *netid) +{ + xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; + xprt->address_strings[RPC_DISPLAY_NETID] = netid; + xs_format_common_peer_addresses(xprt); + xs_format_common_peer_ports(xprt); +} + +static void xs_update_peer_port(struct rpc_xprt *xprt) +{ + kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); + kfree(xprt->address_strings[RPC_DISPLAY_PORT]); + + xs_format_common_peer_ports(xprt); +} + +static void xs_free_peer_addresses(struct rpc_xprt *xprt) +{ + unsigned int i; + + for (i = 0; i < RPC_DISPLAY_MAX; i++) + switch (i) { + case RPC_DISPLAY_PROTO: + case RPC_DISPLAY_NETID: + continue; + default: + kfree(xprt->address_strings[i]); + } +} + +static size_t +xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) +{ + size_t i,n; + + if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES)) + return want; + n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT; + for (i = 0; i < n; i++) { + if (buf->pages[i]) + continue; + buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp); + if (!buf->pages[i]) { + i *= PAGE_SIZE; + return i > buf->page_base ? i - buf->page_base : 0; + } + } + return want; +} + +static ssize_t +xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) +{ + ssize_t ret; + if (seek != 0) + iov_iter_advance(&msg->msg_iter, seek); + ret = sock_recvmsg(sock, msg, flags); + return ret > 0 ? ret + seek : ret; +} + +static ssize_t +xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags, + struct kvec *kvec, size_t count, size_t seek) +{ + iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count); + return xs_sock_recvmsg(sock, msg, flags, seek); +} + +static ssize_t +xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags, + struct bio_vec *bvec, unsigned long nr, size_t count, + size_t seek) +{ + iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count); + return xs_sock_recvmsg(sock, msg, flags, seek); +} + +static ssize_t +xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, + size_t count) +{ + iov_iter_discard(&msg->msg_iter, READ, count); + return sock_recvmsg(sock, msg, flags); +} + +#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE +static void +xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) +{ + struct bvec_iter bi = { + .bi_size = count, + }; + struct bio_vec bv; + + bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); + for_each_bvec(bv, bvec, bi, bi) + flush_dcache_page(bv.bv_page); +} +#else +static inline void +xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) +{ +} +#endif + +static ssize_t +xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags, + struct xdr_buf *buf, size_t count, size_t seek, size_t *read) +{ + size_t want, seek_init = seek, offset = 0; + ssize_t ret; + + want = min_t(size_t, count, buf->head[0].iov_len); + if (seek < want) { + ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek); + if (ret <= 0) + goto sock_err; + offset += ret; + if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) + goto out; + if (ret != want) + goto out; + seek = 0; + } else { + seek -= want; + offset += want; + } + + want = xs_alloc_sparse_pages(buf, + min_t(size_t, count - offset, buf->page_len), + GFP_KERNEL); + if (seek < want) { + ret = xs_read_bvec(sock, msg, flags, buf->bvec, + xdr_buf_pagecount(buf), + want + buf->page_base, + seek + buf->page_base); + if (ret <= 0) + goto sock_err; + xs_flush_bvec(buf->bvec, ret, seek + buf->page_base); + ret -= buf->page_base; + offset += ret; + if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) + goto out; + if (ret != want) + goto out; + seek = 0; + } else { + seek -= want; + offset += want; + } + + want = min_t(size_t, count - offset, buf->tail[0].iov_len); + if (seek < want) { + ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek); + if (ret <= 0) + goto sock_err; + offset += ret; + if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) + goto out; + if (ret != want) + goto out; + } else if (offset < seek_init) + offset = seek_init; + ret = -EMSGSIZE; +out: + *read = offset - seek_init; + return ret; +sock_err: + offset += seek; + goto out; +} + +static void +xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf) +{ + if (!transport->recv.copied) { + if (buf->head[0].iov_len >= transport->recv.offset) + memcpy(buf->head[0].iov_base, + &transport->recv.xid, + transport->recv.offset); + transport->recv.copied = transport->recv.offset; + } +} + +static bool +xs_read_stream_request_done(struct sock_xprt *transport) +{ + return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT); +} + +static void +xs_read_stream_check_eor(struct sock_xprt *transport, + struct msghdr *msg) +{ + if (xs_read_stream_request_done(transport)) + msg->msg_flags |= MSG_EOR; +} + +static ssize_t +xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg, + int flags, struct rpc_rqst *req) +{ + struct xdr_buf *buf = &req->rq_private_buf; + size_t want, read; + ssize_t ret; + + xs_read_header(transport, buf); + + want = transport->recv.len - transport->recv.offset; + if (want != 0) { + ret = xs_read_xdr_buf(transport->sock, msg, flags, buf, + transport->recv.copied + want, + transport->recv.copied, + &read); + transport->recv.offset += read; + transport->recv.copied += read; + } + + if (transport->recv.offset == transport->recv.len) + xs_read_stream_check_eor(transport, msg); + + if (want == 0) + return 0; + + switch (ret) { + default: + break; + case -EFAULT: + case -EMSGSIZE: + msg->msg_flags |= MSG_TRUNC; + return read; + case 0: + return -ESHUTDOWN; + } + return ret < 0 ? ret : read; +} + +static size_t +xs_read_stream_headersize(bool isfrag) +{ + if (isfrag) + return sizeof(__be32); + return 3 * sizeof(__be32); +} + +static ssize_t +xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg, + int flags, size_t want, size_t seek) +{ + struct kvec kvec = { + .iov_base = &transport->recv.fraghdr, + .iov_len = want, + }; + return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek); +} + +#if defined(CONFIG_SUNRPC_BACKCHANNEL) +static ssize_t +xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) +{ + struct rpc_xprt *xprt = &transport->xprt; + struct rpc_rqst *req; + ssize_t ret; + + /* Look up and lock the request corresponding to the given XID */ + req = xprt_lookup_bc_request(xprt, transport->recv.xid); + if (!req) { + printk(KERN_WARNING "Callback slot table overflowed\n"); + return -ESHUTDOWN; + } + if (transport->recv.copied && !req->rq_private_buf.len) + return -ESHUTDOWN; + + ret = xs_read_stream_request(transport, msg, flags, req); + if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) + xprt_complete_bc_request(req, transport->recv.copied); + else + req->rq_private_buf.len = transport->recv.copied; + + return ret; +} +#else /* CONFIG_SUNRPC_BACKCHANNEL */ +static ssize_t +xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) +{ + return -ESHUTDOWN; +} +#endif /* CONFIG_SUNRPC_BACKCHANNEL */ + +static ssize_t +xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags) +{ + struct rpc_xprt *xprt = &transport->xprt; + struct rpc_rqst *req; + ssize_t ret = 0; + + /* Look up and lock the request corresponding to the given XID */ + spin_lock(&xprt->queue_lock); + req = xprt_lookup_rqst(xprt, transport->recv.xid); + if (!req || (transport->recv.copied && !req->rq_private_buf.len)) { + msg->msg_flags |= MSG_TRUNC; + goto out; + } + xprt_pin_rqst(req); + spin_unlock(&xprt->queue_lock); + + ret = xs_read_stream_request(transport, msg, flags, req); + + spin_lock(&xprt->queue_lock); + if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) + xprt_complete_rqst(req->rq_task, transport->recv.copied); + else + req->rq_private_buf.len = transport->recv.copied; + xprt_unpin_rqst(req); +out: + spin_unlock(&xprt->queue_lock); + return ret; +} + +static ssize_t +xs_read_stream(struct sock_xprt *transport, int flags) +{ + struct msghdr msg = { 0 }; + size_t want, read = 0; + ssize_t ret = 0; + + if (transport->recv.len == 0) { + want = xs_read_stream_headersize(transport->recv.copied != 0); + ret = xs_read_stream_header(transport, &msg, flags, want, + transport->recv.offset); + if (ret <= 0) + goto out_err; + transport->recv.offset = ret; + if (transport->recv.offset != want) + return transport->recv.offset; + transport->recv.len = be32_to_cpu(transport->recv.fraghdr) & + RPC_FRAGMENT_SIZE_MASK; + transport->recv.offset -= sizeof(transport->recv.fraghdr); + read = ret; + } + + switch (be32_to_cpu(transport->recv.calldir)) { + default: + msg.msg_flags |= MSG_TRUNC; + break; + case RPC_CALL: + ret = xs_read_stream_call(transport, &msg, flags); + break; + case RPC_REPLY: + ret = xs_read_stream_reply(transport, &msg, flags); + } + if (msg.msg_flags & MSG_TRUNC) { + transport->recv.calldir = cpu_to_be32(-1); + transport->recv.copied = -1; + } + if (ret < 0) + goto out_err; + read += ret; + if (transport->recv.offset < transport->recv.len) { + if (!(msg.msg_flags & MSG_TRUNC)) + return read; + msg.msg_flags = 0; + ret = xs_read_discard(transport->sock, &msg, flags, + transport->recv.len - transport->recv.offset); + if (ret <= 0) + goto out_err; + transport->recv.offset += ret; + read += ret; + if (transport->recv.offset != transport->recv.len) + return read; + } + if (xs_read_stream_request_done(transport)) { + trace_xs_stream_read_request(transport); + transport->recv.copied = 0; + } + transport->recv.offset = 0; + transport->recv.len = 0; + return read; +out_err: + return ret != 0 ? ret : -ESHUTDOWN; +} + +static __poll_t xs_poll_socket(struct sock_xprt *transport) +{ + return transport->sock->ops->poll(transport->file, transport->sock, + NULL); +} + +static bool xs_poll_socket_readable(struct sock_xprt *transport) +{ + __poll_t events = xs_poll_socket(transport); + + return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP); +} + +static void xs_poll_check_readable(struct sock_xprt *transport) +{ + + clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); + if (!xs_poll_socket_readable(transport)) + return; + if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) + queue_work(xprtiod_workqueue, &transport->recv_worker); +} + +static void xs_stream_data_receive(struct sock_xprt *transport) +{ + size_t read = 0; + ssize_t ret = 0; + + mutex_lock(&transport->recv_mutex); + if (transport->sock == NULL) + goto out; + for (;;) { + ret = xs_read_stream(transport, MSG_DONTWAIT); + if (ret < 0) + break; + read += ret; + cond_resched(); + } + if (ret == -ESHUTDOWN) + kernel_sock_shutdown(transport->sock, SHUT_RDWR); + else + xs_poll_check_readable(transport); +out: + mutex_unlock(&transport->recv_mutex); + trace_xs_stream_read_data(&transport->xprt, ret, read); +} + +static void xs_stream_data_receive_workfn(struct work_struct *work) +{ + struct sock_xprt *transport = + container_of(work, struct sock_xprt, recv_worker); + unsigned int pflags = memalloc_nofs_save(); + + xs_stream_data_receive(transport); + memalloc_nofs_restore(pflags); +} + +static void +xs_stream_reset_connect(struct sock_xprt *transport) +{ + transport->recv.offset = 0; + transport->recv.len = 0; + transport->recv.copied = 0; + transport->xmit.offset = 0; +} + +static void +xs_stream_start_connect(struct sock_xprt *transport) +{ + transport->xprt.stat.connect_count++; + transport->xprt.stat.connect_start = jiffies; +} + +#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) + +/** + * xs_nospace - handle transmit was incomplete + * @req: pointer to RPC request + * @transport: pointer to struct sock_xprt + * + */ +static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport) +{ + struct rpc_xprt *xprt = &transport->xprt; + struct sock *sk = transport->inet; + int ret = -EAGAIN; + + trace_rpc_socket_nospace(req, transport); + + /* Protect against races with write_space */ + spin_lock(&xprt->transport_lock); + + /* Don't race with disconnect */ + if (xprt_connected(xprt)) { + struct socket_wq *wq; + + rcu_read_lock(); + wq = rcu_dereference(sk->sk_wq); + set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags); + rcu_read_unlock(); + + /* wait for more buffer space */ + set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); + sk->sk_write_pending++; + xprt_wait_for_buffer_space(xprt); + } else + ret = -ENOTCONN; + + spin_unlock(&xprt->transport_lock); + return ret; +} + +static int xs_sock_nospace(struct rpc_rqst *req) +{ + struct sock_xprt *transport = + container_of(req->rq_xprt, struct sock_xprt, xprt); + struct sock *sk = transport->inet; + int ret = -EAGAIN; + + lock_sock(sk); + if (!sock_writeable(sk)) + ret = xs_nospace(req, transport); + release_sock(sk); + return ret; +} + +static int xs_stream_nospace(struct rpc_rqst *req) +{ + struct sock_xprt *transport = + container_of(req->rq_xprt, struct sock_xprt, xprt); + struct sock *sk = transport->inet; + int ret = -EAGAIN; + + lock_sock(sk); + if (!sk_stream_memory_free(sk)) + ret = xs_nospace(req, transport); + release_sock(sk); + return ret; +} + +static void +xs_stream_prepare_request(struct rpc_rqst *req) +{ + xdr_free_bvec(&req->rq_rcv_buf); + req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL); +} + +/* + * Determine if the previous message in the stream was aborted before it + * could complete transmission. + */ +static bool +xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req) +{ + return transport->xmit.offset != 0 && req->rq_bytes_sent == 0; +} + +/* + * Return the stream record marker field for a record of length < 2^31-1 + */ +static rpc_fraghdr +xs_stream_record_marker(struct xdr_buf *xdr) +{ + if (!xdr->len) + return 0; + return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len); +} + +/** + * xs_local_send_request - write an RPC request to an AF_LOCAL socket + * @req: pointer to RPC request + * + * Return values: + * 0: The request has been sent + * EAGAIN: The socket was blocked, please call again later to + * complete the request + * ENOTCONN: Caller needs to invoke connect logic then call again + * other: Some other error occured, the request was not sent + */ +static int xs_local_send_request(struct rpc_rqst *req) +{ + struct rpc_xprt *xprt = req->rq_xprt; + struct sock_xprt *transport = + container_of(xprt, struct sock_xprt, xprt); + struct xdr_buf *xdr = &req->rq_snd_buf; + rpc_fraghdr rm = xs_stream_record_marker(xdr); + unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; + struct msghdr msg = { + .msg_flags = XS_SENDMSG_FLAGS, + }; + unsigned int sent; + int status; + + /* Close the stream if the previous transmission was incomplete */ + if (xs_send_request_was_aborted(transport, req)) { + xprt_force_disconnect(xprt); + return -ENOTCONN; + } + + xs_pktdump("packet data:", + req->rq_svec->iov_base, req->rq_svec->iov_len); + + req->rq_xtime = ktime_get(); + status = xprt_sock_sendmsg(transport->sock, &msg, xdr, + transport->xmit.offset, rm, &sent); + dprintk("RPC: %s(%u) = %d\n", + __func__, xdr->len - transport->xmit.offset, status); + + if (status == -EAGAIN && sock_writeable(transport->inet)) + status = -ENOBUFS; + + if (likely(sent > 0) || status == 0) { + transport->xmit.offset += sent; + req->rq_bytes_sent = transport->xmit.offset; + if (likely(req->rq_bytes_sent >= msglen)) { + req->rq_xmit_bytes_sent += transport->xmit.offset; + transport->xmit.offset = 0; + return 0; + } + status = -EAGAIN; + } + + switch (status) { + case -ENOBUFS: + break; + case -EAGAIN: + status = xs_stream_nospace(req); + break; + default: + dprintk("RPC: sendmsg returned unrecognized error %d\n", + -status); + fallthrough; + case -EPIPE: + xprt_force_disconnect(xprt); + status = -ENOTCONN; + } + + return status; +} + +/** + * xs_udp_send_request - write an RPC request to a UDP socket + * @req: pointer to RPC request + * + * Return values: + * 0: The request has been sent + * EAGAIN: The socket was blocked, please call again later to + * complete the request + * ENOTCONN: Caller needs to invoke connect logic then call again + * other: Some other error occurred, the request was not sent + */ +static int xs_udp_send_request(struct rpc_rqst *req) +{ + struct rpc_xprt *xprt = req->rq_xprt; + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct xdr_buf *xdr = &req->rq_snd_buf; + struct msghdr msg = { + .msg_name = xs_addr(xprt), + .msg_namelen = xprt->addrlen, + .msg_flags = XS_SENDMSG_FLAGS, + }; + unsigned int sent; + int status; + + xs_pktdump("packet data:", + req->rq_svec->iov_base, + req->rq_svec->iov_len); + + if (!xprt_bound(xprt)) + return -ENOTCONN; + + if (!xprt_request_get_cong(xprt, req)) + return -EBADSLT; + + req->rq_xtime = ktime_get(); + status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent); + + dprintk("RPC: xs_udp_send_request(%u) = %d\n", + xdr->len, status); + + /* firewall is blocking us, don't return -EAGAIN or we end up looping */ + if (status == -EPERM) + goto process_status; + + if (status == -EAGAIN && sock_writeable(transport->inet)) + status = -ENOBUFS; + + if (sent > 0 || status == 0) { + req->rq_xmit_bytes_sent += sent; + if (sent >= req->rq_slen) + return 0; + /* Still some bytes left; set up for a retry later. */ + status = -EAGAIN; + } + +process_status: + switch (status) { + case -ENOTSOCK: + status = -ENOTCONN; + /* Should we call xs_close() here? */ + break; + case -EAGAIN: + status = xs_sock_nospace(req); + break; + case -ENETUNREACH: + case -ENOBUFS: + case -EPIPE: + case -ECONNREFUSED: + case -EPERM: + /* When the server has died, an ICMP port unreachable message + * prompts ECONNREFUSED. */ + break; + default: + dprintk("RPC: sendmsg returned unrecognized error %d\n", + -status); + } + + return status; +} + +/** + * xs_tcp_send_request - write an RPC request to a TCP socket + * @req: pointer to RPC request + * + * Return values: + * 0: The request has been sent + * EAGAIN: The socket was blocked, please call again later to + * complete the request + * ENOTCONN: Caller needs to invoke connect logic then call again + * other: Some other error occurred, the request was not sent + * + * XXX: In the case of soft timeouts, should we eventually give up + * if sendmsg is not able to make progress? + */ +static int xs_tcp_send_request(struct rpc_rqst *req) +{ + struct rpc_xprt *xprt = req->rq_xprt; + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct xdr_buf *xdr = &req->rq_snd_buf; + rpc_fraghdr rm = xs_stream_record_marker(xdr); + unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; + struct msghdr msg = { + .msg_flags = XS_SENDMSG_FLAGS, + }; + bool vm_wait = false; + unsigned int sent; + int status; + + /* Close the stream if the previous transmission was incomplete */ + if (xs_send_request_was_aborted(transport, req)) { + if (transport->sock != NULL) + kernel_sock_shutdown(transport->sock, SHUT_RDWR); + return -ENOTCONN; + } + + xs_pktdump("packet data:", + req->rq_svec->iov_base, + req->rq_svec->iov_len); + + if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) + xs_tcp_set_socket_timeouts(xprt, transport->sock); + + /* Continue transmitting the packet/record. We must be careful + * to cope with writespace callbacks arriving _after_ we have + * called sendmsg(). */ + req->rq_xtime = ktime_get(); + while (1) { + status = xprt_sock_sendmsg(transport->sock, &msg, xdr, + transport->xmit.offset, rm, &sent); + + dprintk("RPC: xs_tcp_send_request(%u) = %d\n", + xdr->len - transport->xmit.offset, status); + + /* If we've sent the entire packet, immediately + * reset the count of bytes sent. */ + transport->xmit.offset += sent; + req->rq_bytes_sent = transport->xmit.offset; + if (likely(req->rq_bytes_sent >= msglen)) { + req->rq_xmit_bytes_sent += transport->xmit.offset; + transport->xmit.offset = 0; + return 0; + } + + WARN_ON_ONCE(sent == 0 && status == 0); + + if (status == -EAGAIN ) { + /* + * Return EAGAIN if we're sure we're hitting the + * socket send buffer limits. + */ + if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) + break; + /* + * Did we hit a memory allocation failure? + */ + if (sent == 0) { + status = -ENOBUFS; + if (vm_wait) + break; + /* Retry, knowing now that we're below the + * socket send buffer limit + */ + vm_wait = true; + } + continue; + } + if (status < 0) + break; + vm_wait = false; + } + + switch (status) { + case -ENOTSOCK: + status = -ENOTCONN; + /* Should we call xs_close() here? */ + break; + case -EAGAIN: + status = xs_stream_nospace(req); + break; + case -ECONNRESET: + case -ECONNREFUSED: + case -ENOTCONN: + case -EADDRINUSE: + case -ENOBUFS: + case -EPIPE: + break; + default: + dprintk("RPC: sendmsg returned unrecognized error %d\n", + -status); + } + + return status; +} + +static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) +{ + transport->old_data_ready = sk->sk_data_ready; + transport->old_state_change = sk->sk_state_change; + transport->old_write_space = sk->sk_write_space; + transport->old_error_report = sk->sk_error_report; +} + +static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) +{ + sk->sk_data_ready = transport->old_data_ready; + sk->sk_state_change = transport->old_state_change; + sk->sk_write_space = transport->old_write_space; + sk->sk_error_report = transport->old_error_report; +} + +static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); + clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state); + clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state); + clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state); +} + +static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr) +{ + set_bit(nr, &transport->sock_state); + queue_work(xprtiod_workqueue, &transport->error_worker); +} + +static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) +{ + smp_mb__before_atomic(); + clear_bit(XPRT_CLOSE_WAIT, &xprt->state); + clear_bit(XPRT_CLOSING, &xprt->state); + xs_sock_reset_state_flags(xprt); + smp_mb__after_atomic(); +} + +/** + * xs_error_report - callback to handle TCP socket state errors + * @sk: socket + * + * Note: we don't call sock_error() since there may be a rpc_task + * using the socket, and so we don't want to clear sk->sk_err. + */ +static void xs_error_report(struct sock *sk) +{ + struct sock_xprt *transport; + struct rpc_xprt *xprt; + + read_lock_bh(&sk->sk_callback_lock); + if (!(xprt = xprt_from_sock(sk))) + goto out; + + transport = container_of(xprt, struct sock_xprt, xprt); + transport->xprt_err = -sk->sk_err; + if (transport->xprt_err == 0) + goto out; + dprintk("RPC: xs_error_report client %p, error=%d...\n", + xprt, -transport->xprt_err); + trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err); + + /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */ + smp_mb__before_atomic(); + xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR); + out: + read_unlock_bh(&sk->sk_callback_lock); +} + +static void xs_reset_transport(struct sock_xprt *transport) +{ + struct socket *sock = transport->sock; + struct sock *sk = transport->inet; + struct rpc_xprt *xprt = &transport->xprt; + struct file *filp = transport->file; + + if (sk == NULL) + return; + /* + * Make sure we're calling this in a context from which it is safe + * to call __fput_sync(). In practice that means rpciod and the + * system workqueue. + */ + if (!(current->flags & PF_WQ_WORKER)) { + WARN_ON_ONCE(1); + set_bit(XPRT_CLOSE_WAIT, &xprt->state); + return; + } + + if (atomic_read(&transport->xprt.swapper)) + sk_clear_memalloc(sk); + + kernel_sock_shutdown(sock, SHUT_RDWR); + + mutex_lock(&transport->recv_mutex); + write_lock_bh(&sk->sk_callback_lock); + transport->inet = NULL; + transport->sock = NULL; + transport->file = NULL; + + sk->sk_user_data = NULL; + + xs_restore_old_callbacks(transport, sk); + xprt_clear_connected(xprt); + write_unlock_bh(&sk->sk_callback_lock); + xs_sock_reset_connection_flags(xprt); + /* Reset stream record info */ + xs_stream_reset_connect(transport); + mutex_unlock(&transport->recv_mutex); + + trace_rpc_socket_close(xprt, sock); + __fput_sync(filp); + + xprt_disconnect_done(xprt); +} + +/** + * xs_close - close a socket + * @xprt: transport + * + * This is used when all requests are complete; ie, no DRC state remains + * on the server we want to save. + * + * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with + * xs_reset_transport() zeroing the socket from underneath a writer. + */ +static void xs_close(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + dprintk("RPC: xs_close xprt %p\n", xprt); + + xs_reset_transport(transport); + xprt->reestablish_timeout = 0; +} + +static void xs_inject_disconnect(struct rpc_xprt *xprt) +{ + dprintk("RPC: injecting transport disconnect on xprt=%p\n", + xprt); + xprt_disconnect_done(xprt); +} + +static void xs_xprt_free(struct rpc_xprt *xprt) +{ + xs_free_peer_addresses(xprt); + xprt_free(xprt); +} + +/** + * xs_destroy - prepare to shutdown a transport + * @xprt: doomed transport + * + */ +static void xs_destroy(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport = container_of(xprt, + struct sock_xprt, xprt); + dprintk("RPC: xs_destroy xprt %p\n", xprt); + + cancel_delayed_work_sync(&transport->connect_worker); + xs_close(xprt); + cancel_work_sync(&transport->recv_worker); + cancel_work_sync(&transport->error_worker); + xs_xprt_free(xprt); + module_put(THIS_MODULE); +} + +/** + * xs_udp_data_read_skb - receive callback for UDP sockets + * @xprt: transport + * @sk: socket + * @skb: skbuff + * + */ +static void xs_udp_data_read_skb(struct rpc_xprt *xprt, + struct sock *sk, + struct sk_buff *skb) +{ + struct rpc_task *task; + struct rpc_rqst *rovr; + int repsize, copied; + u32 _xid; + __be32 *xp; + + repsize = skb->len; + if (repsize < 4) { + dprintk("RPC: impossible RPC reply size %d!\n", repsize); + return; + } + + /* Copy the XID from the skb... */ + xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); + if (xp == NULL) + return; + + /* Look up and lock the request corresponding to the given XID */ + spin_lock(&xprt->queue_lock); + rovr = xprt_lookup_rqst(xprt, *xp); + if (!rovr) + goto out_unlock; + xprt_pin_rqst(rovr); + xprt_update_rtt(rovr->rq_task); + spin_unlock(&xprt->queue_lock); + task = rovr->rq_task; + + if ((copied = rovr->rq_private_buf.buflen) > repsize) + copied = repsize; + + /* Suck it into the iovec, verify checksum if not done by hw. */ + if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { + spin_lock(&xprt->queue_lock); + __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); + goto out_unpin; + } + + + spin_lock(&xprt->transport_lock); + xprt_adjust_cwnd(xprt, task, copied); + spin_unlock(&xprt->transport_lock); + spin_lock(&xprt->queue_lock); + xprt_complete_rqst(task, copied); + __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); +out_unpin: + xprt_unpin_rqst(rovr); + out_unlock: + spin_unlock(&xprt->queue_lock); +} + +static void xs_udp_data_receive(struct sock_xprt *transport) +{ + struct sk_buff *skb; + struct sock *sk; + int err; + + mutex_lock(&transport->recv_mutex); + sk = transport->inet; + if (sk == NULL) + goto out; + for (;;) { + skb = skb_recv_udp(sk, 0, 1, &err); + if (skb == NULL) + break; + xs_udp_data_read_skb(&transport->xprt, sk, skb); + consume_skb(skb); + cond_resched(); + } + xs_poll_check_readable(transport); +out: + mutex_unlock(&transport->recv_mutex); +} + +static void xs_udp_data_receive_workfn(struct work_struct *work) +{ + struct sock_xprt *transport = + container_of(work, struct sock_xprt, recv_worker); + unsigned int pflags = memalloc_nofs_save(); + + xs_udp_data_receive(transport); + memalloc_nofs_restore(pflags); +} + +/** + * xs_data_ready - "data ready" callback for UDP sockets + * @sk: socket with data to read + * + */ +static void xs_data_ready(struct sock *sk) +{ + struct rpc_xprt *xprt; + + read_lock_bh(&sk->sk_callback_lock); + dprintk("RPC: xs_data_ready...\n"); + xprt = xprt_from_sock(sk); + if (xprt != NULL) { + struct sock_xprt *transport = container_of(xprt, + struct sock_xprt, xprt); + transport->old_data_ready(sk); + /* Any data means we had a useful conversation, so + * then we don't need to delay the next reconnect + */ + if (xprt->reestablish_timeout) + xprt->reestablish_timeout = 0; + if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) + queue_work(xprtiod_workqueue, &transport->recv_worker); + } + read_unlock_bh(&sk->sk_callback_lock); +} + +/* + * Helper function to force a TCP close if the server is sending + * junk and/or it has put us in CLOSE_WAIT + */ +static void xs_tcp_force_close(struct rpc_xprt *xprt) +{ + xprt_force_disconnect(xprt); +} + +#if defined(CONFIG_SUNRPC_BACKCHANNEL) +static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) +{ + return PAGE_SIZE; +} +#endif /* CONFIG_SUNRPC_BACKCHANNEL */ + +/** + * xs_tcp_state_change - callback to handle TCP socket state changes + * @sk: socket whose state has changed + * + */ +static void xs_tcp_state_change(struct sock *sk) +{ + struct rpc_xprt *xprt; + struct sock_xprt *transport; + + read_lock_bh(&sk->sk_callback_lock); + if (!(xprt = xprt_from_sock(sk))) + goto out; + dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); + dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", + sk->sk_state, xprt_connected(xprt), + sock_flag(sk, SOCK_DEAD), + sock_flag(sk, SOCK_ZAPPED), + sk->sk_shutdown); + + transport = container_of(xprt, struct sock_xprt, xprt); + trace_rpc_socket_state_change(xprt, sk->sk_socket); + switch (sk->sk_state) { + case TCP_ESTABLISHED: + if (!xprt_test_and_set_connected(xprt)) { + xprt->connect_cookie++; + clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); + xprt_clear_connecting(xprt); + + xprt->stat.connect_count++; + xprt->stat.connect_time += (long)jiffies - + xprt->stat.connect_start; + xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING); + } + break; + case TCP_FIN_WAIT1: + /* The client initiated a shutdown of the socket */ + xprt->connect_cookie++; + xprt->reestablish_timeout = 0; + set_bit(XPRT_CLOSING, &xprt->state); + smp_mb__before_atomic(); + clear_bit(XPRT_CONNECTED, &xprt->state); + clear_bit(XPRT_CLOSE_WAIT, &xprt->state); + smp_mb__after_atomic(); + break; + case TCP_CLOSE_WAIT: + /* The server initiated a shutdown of the socket */ + xprt->connect_cookie++; + clear_bit(XPRT_CONNECTED, &xprt->state); + xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); + fallthrough; + case TCP_CLOSING: + /* + * If the server closed down the connection, make sure that + * we back off before reconnecting + */ + if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; + break; + case TCP_LAST_ACK: + set_bit(XPRT_CLOSING, &xprt->state); + smp_mb__before_atomic(); + clear_bit(XPRT_CONNECTED, &xprt->state); + smp_mb__after_atomic(); + break; + case TCP_CLOSE: + if (test_and_clear_bit(XPRT_SOCK_CONNECTING, + &transport->sock_state)) + xprt_clear_connecting(xprt); + clear_bit(XPRT_CLOSING, &xprt->state); + /* Trigger the socket release */ + xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); + } + out: + read_unlock_bh(&sk->sk_callback_lock); +} + +static void xs_write_space(struct sock *sk) +{ + struct socket_wq *wq; + struct sock_xprt *transport; + struct rpc_xprt *xprt; + + if (!sk->sk_socket) + return; + clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); + + if (unlikely(!(xprt = xprt_from_sock(sk)))) + return; + transport = container_of(xprt, struct sock_xprt, xprt); + rcu_read_lock(); + wq = rcu_dereference(sk->sk_wq); + if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) + goto out; + + xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE); + sk->sk_write_pending--; +out: + rcu_read_unlock(); +} + +/** + * xs_udp_write_space - callback invoked when socket buffer space + * becomes available + * @sk: socket whose state has changed + * + * Called when more output buffer space is available for this socket. + * We try not to wake our writers until they can make "significant" + * progress, otherwise we'll waste resources thrashing kernel_sendmsg + * with a bunch of small requests. + */ +static void xs_udp_write_space(struct sock *sk) +{ + read_lock_bh(&sk->sk_callback_lock); + + /* from net/core/sock.c:sock_def_write_space */ + if (sock_writeable(sk)) + xs_write_space(sk); + + read_unlock_bh(&sk->sk_callback_lock); +} + +/** + * xs_tcp_write_space - callback invoked when socket buffer space + * becomes available + * @sk: socket whose state has changed + * + * Called when more output buffer space is available for this socket. + * We try not to wake our writers until they can make "significant" + * progress, otherwise we'll waste resources thrashing kernel_sendmsg + * with a bunch of small requests. + */ +static void xs_tcp_write_space(struct sock *sk) +{ + read_lock_bh(&sk->sk_callback_lock); + + /* from net/core/stream.c:sk_stream_write_space */ + if (sk_stream_is_writeable(sk)) + xs_write_space(sk); + + read_unlock_bh(&sk->sk_callback_lock); +} + +static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct sock *sk = transport->inet; + + if (transport->rcvsize) { + sk->sk_userlocks |= SOCK_RCVBUF_LOCK; + sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; + } + if (transport->sndsize) { + sk->sk_userlocks |= SOCK_SNDBUF_LOCK; + sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; + sk->sk_write_space(sk); + } +} + +/** + * xs_udp_set_buffer_size - set send and receive limits + * @xprt: generic transport + * @sndsize: requested size of send buffer, in bytes + * @rcvsize: requested size of receive buffer, in bytes + * + * Set socket send and receive buffer size limits. + */ +static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + transport->sndsize = 0; + if (sndsize) + transport->sndsize = sndsize + 1024; + transport->rcvsize = 0; + if (rcvsize) + transport->rcvsize = rcvsize + 1024; + + xs_udp_do_set_buffer_size(xprt); +} + +/** + * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport + * @xprt: controlling transport + * @task: task that timed out + * + * Adjust the congestion window after a retransmit timeout has occurred. + */ +static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) +{ + spin_lock(&xprt->transport_lock); + xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); + spin_unlock(&xprt->transport_lock); +} + +static int xs_get_random_port(void) +{ + unsigned short min = xprt_min_resvport, max = xprt_max_resvport; + unsigned short range; + unsigned short rand; + + if (max < min) + return -EADDRINUSE; + range = max - min + 1; + rand = (unsigned short) prandom_u32() % range; + return rand + min; +} + +static unsigned short xs_sock_getport(struct socket *sock) +{ + struct sockaddr_storage buf; + unsigned short port = 0; + + if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0) + goto out; + switch (buf.ss_family) { + case AF_INET6: + port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); + break; + case AF_INET: + port = ntohs(((struct sockaddr_in *)&buf)->sin_port); + } +out: + return port; +} + +/** + * xs_set_port - reset the port number in the remote endpoint address + * @xprt: generic transport + * @port: new port number + * + */ +static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) +{ + dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); + + rpc_set_port(xs_addr(xprt), port); + xs_update_peer_port(xprt); +} + +static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) +{ + if (transport->srcport == 0 && transport->xprt.reuseport) + transport->srcport = xs_sock_getport(sock); +} + +static int xs_get_srcport(struct sock_xprt *transport) +{ + int port = transport->srcport; + + if (port == 0 && transport->xprt.resvport) + port = xs_get_random_port(); + return port; +} + +unsigned short get_srcport(struct rpc_xprt *xprt) +{ + struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt); + return xs_sock_getport(sock->sock); +} +EXPORT_SYMBOL(get_srcport); + +static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) +{ + if (transport->srcport != 0) + transport->srcport = 0; + if (!transport->xprt.resvport) + return 0; + if (port <= xprt_min_resvport || port > xprt_max_resvport) + return xprt_max_resvport; + return --port; +} +static int xs_bind(struct sock_xprt *transport, struct socket *sock) +{ + struct sockaddr_storage myaddr; + int err, nloop = 0; + int port = xs_get_srcport(transport); + unsigned short last; + + /* + * If we are asking for any ephemeral port (i.e. port == 0 && + * transport->xprt.resvport == 0), don't bind. Let the local + * port selection happen implicitly when the socket is used + * (for example at connect time). + * + * This ensures that we can continue to establish TCP + * connections even when all local ephemeral ports are already + * a part of some TCP connection. This makes no difference + * for UDP sockets, but also doens't harm them. + * + * If we're asking for any reserved port (i.e. port == 0 && + * transport->xprt.resvport == 1) xs_get_srcport above will + * ensure that port is non-zero and we will bind as needed. + */ + if (port <= 0) + return port; + + memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); + do { + rpc_set_port((struct sockaddr *)&myaddr, port); + err = kernel_bind(sock, (struct sockaddr *)&myaddr, + transport->xprt.addrlen); + if (err == 0) { + if (transport->xprt.reuseport) + transport->srcport = port; + break; + } + last = port; + port = xs_next_srcport(transport, port); + if (port > last) + nloop++; + } while (err == -EADDRINUSE && nloop != 2); + + if (myaddr.ss_family == AF_INET) + dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, + &((struct sockaddr_in *)&myaddr)->sin_addr, + port, err ? "failed" : "ok", err); + else + dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, + &((struct sockaddr_in6 *)&myaddr)->sin6_addr, + port, err ? "failed" : "ok", err); + return err; +} + +/* + * We don't support autobind on AF_LOCAL sockets + */ +static void xs_local_rpcbind(struct rpc_task *task) +{ + xprt_set_bound(task->tk_xprt); +} + +static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) +{ +} + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +static struct lock_class_key xs_key[2]; +static struct lock_class_key xs_slock_key[2]; + +static inline void xs_reclassify_socketu(struct socket *sock) +{ + struct sock *sk = sock->sk; + + sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", + &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); +} + +static inline void xs_reclassify_socket4(struct socket *sock) +{ + struct sock *sk = sock->sk; + + sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", + &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); +} + +static inline void xs_reclassify_socket6(struct socket *sock) +{ + struct sock *sk = sock->sk; + + sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", + &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); +} + +static inline void xs_reclassify_socket(int family, struct socket *sock) +{ + if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) + return; + + switch (family) { + case AF_LOCAL: + xs_reclassify_socketu(sock); + break; + case AF_INET: + xs_reclassify_socket4(sock); + break; + case AF_INET6: + xs_reclassify_socket6(sock); + break; + } +} +#else +static inline void xs_reclassify_socket(int family, struct socket *sock) +{ +} +#endif + +static void xs_dummy_setup_socket(struct work_struct *work) +{ +} + +static struct socket *xs_create_sock(struct rpc_xprt *xprt, + struct sock_xprt *transport, int family, int type, + int protocol, bool reuseport) +{ + struct file *filp; + struct socket *sock; + int err; + + err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); + if (err < 0) { + dprintk("RPC: can't create %d transport socket (%d).\n", + protocol, -err); + goto out; + } + xs_reclassify_socket(family, sock); + + if (reuseport) + sock_set_reuseport(sock->sk); + + err = xs_bind(transport, sock); + if (err) { + sock_release(sock); + goto out; + } + + filp = sock_alloc_file(sock, O_NONBLOCK, NULL); + if (IS_ERR(filp)) + return ERR_CAST(filp); + transport->file = filp; + + return sock; +out: + return ERR_PTR(err); +} + +static int xs_local_finish_connecting(struct rpc_xprt *xprt, + struct socket *sock) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, + xprt); + + if (!transport->inet) { + struct sock *sk = sock->sk; + + write_lock_bh(&sk->sk_callback_lock); + + xs_save_old_callbacks(transport, sk); + + sk->sk_user_data = xprt; + sk->sk_data_ready = xs_data_ready; + sk->sk_write_space = xs_udp_write_space; + sock_set_flag(sk, SOCK_FASYNC); + sk->sk_error_report = xs_error_report; + + xprt_clear_connected(xprt); + + /* Reset to new socket */ + transport->sock = sock; + transport->inet = sk; + + write_unlock_bh(&sk->sk_callback_lock); + } + + xs_stream_start_connect(transport); + + return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); +} + +/** + * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint + * @transport: socket transport to connect + */ +static int xs_local_setup_socket(struct sock_xprt *transport) +{ + struct rpc_xprt *xprt = &transport->xprt; + struct file *filp; + struct socket *sock; + int status; + + status = __sock_create(xprt->xprt_net, AF_LOCAL, + SOCK_STREAM, 0, &sock, 1); + if (status < 0) { + dprintk("RPC: can't create AF_LOCAL " + "transport socket (%d).\n", -status); + goto out; + } + xs_reclassify_socket(AF_LOCAL, sock); + + filp = sock_alloc_file(sock, O_NONBLOCK, NULL); + if (IS_ERR(filp)) { + status = PTR_ERR(filp); + goto out; + } + transport->file = filp; + + dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", + xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); + + status = xs_local_finish_connecting(xprt, sock); + trace_rpc_socket_connect(xprt, sock, status); + switch (status) { + case 0: + dprintk("RPC: xprt %p connected to %s\n", + xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); + xprt->stat.connect_count++; + xprt->stat.connect_time += (long)jiffies - + xprt->stat.connect_start; + xprt_set_connected(xprt); + break; + case -ENOBUFS: + break; + case -ENOENT: + dprintk("RPC: xprt %p: socket %s does not exist\n", + xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); + break; + case -ECONNREFUSED: + dprintk("RPC: xprt %p: connection refused for %s\n", + xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); + break; + default: + printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", + __func__, -status, + xprt->address_strings[RPC_DISPLAY_ADDR]); + } + +out: + xprt_clear_connecting(xprt); + xprt_wake_pending_tasks(xprt, status); + return status; +} + +static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + int ret; + + if (RPC_IS_ASYNC(task)) { + /* + * We want the AF_LOCAL connect to be resolved in the + * filesystem namespace of the process making the rpc + * call. Thus we connect synchronously. + * + * If we want to support asynchronous AF_LOCAL calls, + * we'll need to figure out how to pass a namespace to + * connect. + */ + task->tk_rpc_status = -ENOTCONN; + rpc_exit(task, -ENOTCONN); + return; + } + ret = xs_local_setup_socket(transport); + if (ret && !RPC_IS_SOFTCONN(task)) + msleep_interruptible(15000); +} + +#if IS_ENABLED(CONFIG_SUNRPC_SWAP) +/* + * Note that this should be called with XPRT_LOCKED held (or when we otherwise + * know that we have exclusive access to the socket), to guard against + * races with xs_reset_transport. + */ +static void xs_set_memalloc(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, + xprt); + + /* + * If there's no sock, then we have nothing to set. The + * reconnecting process will get it for us. + */ + if (!transport->inet) + return; + if (atomic_read(&xprt->swapper)) + sk_set_memalloc(transport->inet); +} + +/** + * xs_enable_swap - Tag this transport as being used for swap. + * @xprt: transport to tag + * + * Take a reference to this transport on behalf of the rpc_clnt, and + * optionally mark it for swapping if it wasn't already. + */ +static int +xs_enable_swap(struct rpc_xprt *xprt) +{ + struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); + + if (atomic_inc_return(&xprt->swapper) != 1) + return 0; + if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) + return -ERESTARTSYS; + if (xs->inet) + sk_set_memalloc(xs->inet); + xprt_release_xprt(xprt, NULL); + return 0; +} + +/** + * xs_disable_swap - Untag this transport as being used for swap. + * @xprt: transport to tag + * + * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the + * swapper refcount goes to 0, untag the socket as a memalloc socket. + */ +static void +xs_disable_swap(struct rpc_xprt *xprt) +{ + struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); + + if (!atomic_dec_and_test(&xprt->swapper)) + return; + if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) + return; + if (xs->inet) + sk_clear_memalloc(xs->inet); + xprt_release_xprt(xprt, NULL); +} +#else +static void xs_set_memalloc(struct rpc_xprt *xprt) +{ +} + +static int +xs_enable_swap(struct rpc_xprt *xprt) +{ + return -EINVAL; +} + +static void +xs_disable_swap(struct rpc_xprt *xprt) +{ +} +#endif + +static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + if (!transport->inet) { + struct sock *sk = sock->sk; + + write_lock_bh(&sk->sk_callback_lock); + + xs_save_old_callbacks(transport, sk); + + sk->sk_user_data = xprt; + sk->sk_data_ready = xs_data_ready; + sk->sk_write_space = xs_udp_write_space; + sock_set_flag(sk, SOCK_FASYNC); + + xprt_set_connected(xprt); + + /* Reset to new socket */ + transport->sock = sock; + transport->inet = sk; + + xs_set_memalloc(xprt); + + write_unlock_bh(&sk->sk_callback_lock); + } + xs_udp_do_set_buffer_size(xprt); + + xprt->stat.connect_start = jiffies; +} + +static void xs_udp_setup_socket(struct work_struct *work) +{ + struct sock_xprt *transport = + container_of(work, struct sock_xprt, connect_worker.work); + struct rpc_xprt *xprt = &transport->xprt; + struct socket *sock; + int status = -EIO; + + sock = xs_create_sock(xprt, transport, + xs_addr(xprt)->sa_family, SOCK_DGRAM, + IPPROTO_UDP, false); + if (IS_ERR(sock)) + goto out; + + dprintk("RPC: worker connecting xprt %p via %s to " + "%s (port %s)\n", xprt, + xprt->address_strings[RPC_DISPLAY_PROTO], + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT]); + + xs_udp_finish_connecting(xprt, sock); + trace_rpc_socket_connect(xprt, sock, 0); + status = 0; +out: + xprt_clear_connecting(xprt); + xprt_unlock_connect(xprt, transport); + xprt_wake_pending_tasks(xprt, status); +} + +/** + * xs_tcp_shutdown - gracefully shut down a TCP socket + * @xprt: transport + * + * Initiates a graceful shutdown of the TCP socket by calling the + * equivalent of shutdown(SHUT_RDWR); + */ +static void xs_tcp_shutdown(struct rpc_xprt *xprt) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct socket *sock = transport->sock; + int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE; + + if (sock == NULL) + return; + switch (skst) { + default: + kernel_sock_shutdown(sock, SHUT_RDWR); + trace_rpc_socket_shutdown(xprt, sock); + break; + case TCP_CLOSE: + case TCP_TIME_WAIT: + xs_reset_transport(transport); + } +} + +static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, + struct socket *sock) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + unsigned int keepidle; + unsigned int keepcnt; + unsigned int timeo; + + spin_lock(&xprt->transport_lock); + keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); + keepcnt = xprt->timeout->to_retries + 1; + timeo = jiffies_to_msecs(xprt->timeout->to_initval) * + (xprt->timeout->to_retries + 1); + clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); + spin_unlock(&xprt->transport_lock); + + /* TCP Keepalive options */ + sock_set_keepalive(sock->sk); + tcp_sock_set_keepidle(sock->sk, keepidle); + tcp_sock_set_keepintvl(sock->sk, keepidle); + tcp_sock_set_keepcnt(sock->sk, keepcnt); + + /* TCP user timeout (see RFC5482) */ + tcp_sock_set_user_timeout(sock->sk, timeo); +} + +static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, + unsigned long connect_timeout, + unsigned long reconnect_timeout) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + struct rpc_timeout to; + unsigned long initval; + + spin_lock(&xprt->transport_lock); + if (reconnect_timeout < xprt->max_reconnect_timeout) + xprt->max_reconnect_timeout = reconnect_timeout; + if (connect_timeout < xprt->connect_timeout) { + memcpy(&to, xprt->timeout, sizeof(to)); + initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); + /* Arbitrary lower limit */ + if (initval < XS_TCP_INIT_REEST_TO << 1) + initval = XS_TCP_INIT_REEST_TO << 1; + to.to_initval = initval; + to.to_maxval = initval; + memcpy(&transport->tcp_timeout, &to, + sizeof(transport->tcp_timeout)); + xprt->timeout = &transport->tcp_timeout; + xprt->connect_timeout = connect_timeout; + } + set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); + spin_unlock(&xprt->transport_lock); +} + +static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + int ret = -ENOTCONN; + + if (!transport->inet) { + struct sock *sk = sock->sk; + + /* Avoid temporary address, they are bad for long-lived + * connections such as NFS mounts. + * RFC4941, section 3.6 suggests that: + * Individual applications, which have specific + * knowledge about the normal duration of connections, + * MAY override this as appropriate. + */ + if (xs_addr(xprt)->sa_family == PF_INET6) { + ip6_sock_set_addr_preferences(sk, + IPV6_PREFER_SRC_PUBLIC); + } + + xs_tcp_set_socket_timeouts(xprt, sock); + + write_lock_bh(&sk->sk_callback_lock); + + xs_save_old_callbacks(transport, sk); + + sk->sk_user_data = xprt; + sk->sk_data_ready = xs_data_ready; + sk->sk_state_change = xs_tcp_state_change; + sk->sk_write_space = xs_tcp_write_space; + sock_set_flag(sk, SOCK_FASYNC); + sk->sk_error_report = xs_error_report; + + /* socket options */ + sock_reset_flag(sk, SOCK_LINGER); + tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; + + xprt_clear_connected(xprt); + + /* Reset to new socket */ + transport->sock = sock; + transport->inet = sk; + + write_unlock_bh(&sk->sk_callback_lock); + } + + if (!xprt_bound(xprt)) + goto out; + + xs_set_memalloc(xprt); + + xs_stream_start_connect(transport); + + /* Tell the socket layer to start connecting... */ + set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); + ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); + switch (ret) { + case 0: + xs_set_srcport(transport, sock); + fallthrough; + case -EINPROGRESS: + /* SYN_SENT! */ + if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; + break; + case -EADDRNOTAVAIL: + /* Source port number is unavailable. Try a new one! */ + transport->srcport = 0; + } +out: + return ret; +} + +/** + * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint + * @work: queued work item + * + * Invoked by a work queue tasklet. + */ +static void xs_tcp_setup_socket(struct work_struct *work) +{ + struct sock_xprt *transport = + container_of(work, struct sock_xprt, connect_worker.work); + struct socket *sock = transport->sock; + struct rpc_xprt *xprt = &transport->xprt; + int status = -EIO; + + if (xprt_connected(xprt)) + goto out; + if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT, + &transport->sock_state) || + !sock) { + xs_reset_transport(transport); + sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family, + SOCK_STREAM, IPPROTO_TCP, true); + if (IS_ERR(sock)) { + status = PTR_ERR(sock); + goto out; + } + } + + dprintk("RPC: worker connecting xprt %p via %s to " + "%s (port %s)\n", xprt, + xprt->address_strings[RPC_DISPLAY_PROTO], + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT]); + + status = xs_tcp_finish_connecting(xprt, sock); + trace_rpc_socket_connect(xprt, sock, status); + dprintk("RPC: %p connect status %d connected %d sock state %d\n", + xprt, -status, xprt_connected(xprt), + sock->sk->sk_state); + switch (status) { + default: + printk("%s: connect returned unhandled error %d\n", + __func__, status); + fallthrough; + case -EADDRNOTAVAIL: + /* We're probably in TIME_WAIT. Get rid of existing socket, + * and retry + */ + xs_tcp_force_close(xprt); + break; + case 0: + case -EINPROGRESS: + set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state); + fallthrough; + case -EALREADY: + xprt_unlock_connect(xprt, transport); + return; + case -EINVAL: + /* Happens, for instance, if the user specified a link + * local IPv6 address without a scope-id. + */ + case -ECONNREFUSED: + case -ECONNRESET: + case -ENETDOWN: + case -ENETUNREACH: + case -EHOSTUNREACH: + case -EADDRINUSE: + case -ENOBUFS: + /* + * xs_tcp_force_close() wakes tasks with -EIO. + * We need to wake them first to ensure the + * correct error code. + */ + xprt_wake_pending_tasks(xprt, status); + xs_tcp_force_close(xprt); + goto out; + } + status = -EAGAIN; +out: + xprt_clear_connecting(xprt); + xprt_unlock_connect(xprt, transport); + xprt_wake_pending_tasks(xprt, status); +} + +/** + * xs_connect - connect a socket to a remote endpoint + * @xprt: pointer to transport structure + * @task: address of RPC task that manages state of connect request + * + * TCP: If the remote end dropped the connection, delay reconnecting. + * + * UDP socket connects are synchronous, but we use a work queue anyway + * to guarantee that even unprivileged user processes can set up a + * socket on a privileged port. + * + * If a UDP socket connect fails, the delay behavior here prevents + * retry floods (hard mounts). + */ +static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + unsigned long delay = 0; + + WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); + + if (transport->sock != NULL) { + dprintk("RPC: xs_connect delayed xprt %p for %lu " + "seconds\n", xprt, xprt->reestablish_timeout / HZ); + + delay = xprt_reconnect_delay(xprt); + xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO); + + } else + dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); + + queue_delayed_work(xprtiod_workqueue, + &transport->connect_worker, + delay); +} + +static void xs_wake_disconnect(struct sock_xprt *transport) +{ + if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state)) + xs_tcp_force_close(&transport->xprt); +} + +static void xs_wake_write(struct sock_xprt *transport) +{ + if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state)) + xprt_write_space(&transport->xprt); +} + +static void xs_wake_error(struct sock_xprt *transport) +{ + int sockerr; + + if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) + return; + mutex_lock(&transport->recv_mutex); + if (transport->sock == NULL) + goto out; + if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) + goto out; + sockerr = xchg(&transport->xprt_err, 0); + if (sockerr < 0) + xprt_wake_pending_tasks(&transport->xprt, sockerr); +out: + mutex_unlock(&transport->recv_mutex); +} + +static void xs_wake_pending(struct sock_xprt *transport) +{ + if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state)) + xprt_wake_pending_tasks(&transport->xprt, -EAGAIN); +} + +static void xs_error_handle(struct work_struct *work) +{ + struct sock_xprt *transport = container_of(work, + struct sock_xprt, error_worker); + + xs_wake_disconnect(transport); + xs_wake_write(transport); + xs_wake_error(transport); + xs_wake_pending(transport); +} + +/** + * xs_local_print_stats - display AF_LOCAL socket-specifc stats + * @xprt: rpc_xprt struct containing statistics + * @seq: output file + * + */ +static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) +{ + long idle_time = 0; + + if (xprt_connected(xprt)) + idle_time = (long)(jiffies - xprt->last_used) / HZ; + + seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " + "%llu %llu %lu %llu %llu\n", + xprt->stat.bind_count, + xprt->stat.connect_count, + xprt->stat.connect_time / HZ, + idle_time, + xprt->stat.sends, + xprt->stat.recvs, + xprt->stat.bad_xids, + xprt->stat.req_u, + xprt->stat.bklog_u, + xprt->stat.max_slots, + xprt->stat.sending_u, + xprt->stat.pending_u); +} + +/** + * xs_udp_print_stats - display UDP socket-specifc stats + * @xprt: rpc_xprt struct containing statistics + * @seq: output file + * + */ +static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + + seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " + "%lu %llu %llu\n", + transport->srcport, + xprt->stat.bind_count, + xprt->stat.sends, + xprt->stat.recvs, + xprt->stat.bad_xids, + xprt->stat.req_u, + xprt->stat.bklog_u, + xprt->stat.max_slots, + xprt->stat.sending_u, + xprt->stat.pending_u); +} + +/** + * xs_tcp_print_stats - display TCP socket-specifc stats + * @xprt: rpc_xprt struct containing statistics + * @seq: output file + * + */ +static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) +{ + struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); + long idle_time = 0; + + if (xprt_connected(xprt)) + idle_time = (long)(jiffies - xprt->last_used) / HZ; + + seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " + "%llu %llu %lu %llu %llu\n", + transport->srcport, + xprt->stat.bind_count, + xprt->stat.connect_count, + xprt->stat.connect_time / HZ, + idle_time, + xprt->stat.sends, + xprt->stat.recvs, + xprt->stat.bad_xids, + xprt->stat.req_u, + xprt->stat.bklog_u, + xprt->stat.max_slots, + xprt->stat.sending_u, + xprt->stat.pending_u); +} + +/* + * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason + * we allocate pages instead doing a kmalloc like rpc_malloc is because we want + * to use the server side send routines. + */ +static int bc_malloc(struct rpc_task *task) +{ + struct rpc_rqst *rqst = task->tk_rqstp; + size_t size = rqst->rq_callsize; + struct page *page; + struct rpc_buffer *buf; + + if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { + WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", + size); + return -EINVAL; + } + + page = alloc_page(GFP_KERNEL); + if (!page) + return -ENOMEM; + + buf = page_address(page); + buf->len = PAGE_SIZE; + + rqst->rq_buffer = buf->data; + rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; + return 0; +} + +/* + * Free the space allocated in the bc_alloc routine + */ +static void bc_free(struct rpc_task *task) +{ + void *buffer = task->tk_rqstp->rq_buffer; + struct rpc_buffer *buf; + + buf = container_of(buffer, struct rpc_buffer, data); + free_page((unsigned long)buf); +} + +static int bc_sendto(struct rpc_rqst *req) +{ + struct xdr_buf *xdr = &req->rq_snd_buf; + struct sock_xprt *transport = + container_of(req->rq_xprt, struct sock_xprt, xprt); + struct msghdr msg = { + .msg_flags = 0, + }; + rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | + (u32)xdr->len); + unsigned int sent = 0; + int err; + + req->rq_xtime = ktime_get(); + err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent); + xdr_free_bvec(xdr); + if (err < 0 || sent != (xdr->len + sizeof(marker))) + return -EAGAIN; + return sent; +} + +/** + * bc_send_request - Send a backchannel Call on a TCP socket + * @req: rpc_rqst containing Call message to be sent + * + * xpt_mutex ensures @rqstp's whole message is written to the socket + * without interruption. + * + * Return values: + * %0 if the message was sent successfully + * %ENOTCONN if the message was not sent + */ +static int bc_send_request(struct rpc_rqst *req) +{ + struct svc_xprt *xprt; + int len; + + /* + * Get the server socket associated with this callback xprt + */ + xprt = req->rq_xprt->bc_xprt; + + /* + * Grab the mutex to serialize data as the connection is shared + * with the fore channel + */ + mutex_lock(&xprt->xpt_mutex); + if (test_bit(XPT_DEAD, &xprt->xpt_flags)) + len = -ENOTCONN; + else + len = bc_sendto(req); + mutex_unlock(&xprt->xpt_mutex); + + if (len > 0) + len = 0; + + return len; +} + +/* + * The close routine. Since this is client initiated, we do nothing + */ + +static void bc_close(struct rpc_xprt *xprt) +{ + xprt_disconnect_done(xprt); +} + +/* + * The xprt destroy routine. Again, because this connection is client + * initiated, we do nothing + */ + +static void bc_destroy(struct rpc_xprt *xprt) +{ + dprintk("RPC: bc_destroy xprt %p\n", xprt); + + xs_xprt_free(xprt); + module_put(THIS_MODULE); +} + +static const struct rpc_xprt_ops xs_local_ops = { + .reserve_xprt = xprt_reserve_xprt, + .release_xprt = xprt_release_xprt, + .alloc_slot = xprt_alloc_slot, + .free_slot = xprt_free_slot, + .rpcbind = xs_local_rpcbind, + .set_port = xs_local_set_port, + .connect = xs_local_connect, + .buf_alloc = rpc_malloc, + .buf_free = rpc_free, + .prepare_request = xs_stream_prepare_request, + .send_request = xs_local_send_request, + .wait_for_reply_request = xprt_wait_for_reply_request_def, + .close = xs_close, + .destroy = xs_destroy, + .print_stats = xs_local_print_stats, + .enable_swap = xs_enable_swap, + .disable_swap = xs_disable_swap, +}; + +static const struct rpc_xprt_ops xs_udp_ops = { + .set_buffer_size = xs_udp_set_buffer_size, + .reserve_xprt = xprt_reserve_xprt_cong, + .release_xprt = xprt_release_xprt_cong, + .alloc_slot = xprt_alloc_slot, + .free_slot = xprt_free_slot, + .rpcbind = rpcb_getport_async, + .set_port = xs_set_port, + .connect = xs_connect, + .buf_alloc = rpc_malloc, + .buf_free = rpc_free, + .send_request = xs_udp_send_request, + .wait_for_reply_request = xprt_wait_for_reply_request_rtt, + .timer = xs_udp_timer, + .release_request = xprt_release_rqst_cong, + .close = xs_close, + .destroy = xs_destroy, + .print_stats = xs_udp_print_stats, + .enable_swap = xs_enable_swap, + .disable_swap = xs_disable_swap, + .inject_disconnect = xs_inject_disconnect, +}; + +static const struct rpc_xprt_ops xs_tcp_ops = { + .reserve_xprt = xprt_reserve_xprt, + .release_xprt = xprt_release_xprt, + .alloc_slot = xprt_alloc_slot, + .free_slot = xprt_free_slot, + .rpcbind = rpcb_getport_async, + .set_port = xs_set_port, + .connect = xs_connect, + .buf_alloc = rpc_malloc, + .buf_free = rpc_free, + .prepare_request = xs_stream_prepare_request, + .send_request = xs_tcp_send_request, + .wait_for_reply_request = xprt_wait_for_reply_request_def, + .close = xs_tcp_shutdown, + .destroy = xs_destroy, + .set_connect_timeout = xs_tcp_set_connect_timeout, + .print_stats = xs_tcp_print_stats, + .enable_swap = xs_enable_swap, + .disable_swap = xs_disable_swap, + .inject_disconnect = xs_inject_disconnect, +#ifdef CONFIG_SUNRPC_BACKCHANNEL + .bc_setup = xprt_setup_bc, + .bc_maxpayload = xs_tcp_bc_maxpayload, + .bc_num_slots = xprt_bc_max_slots, + .bc_free_rqst = xprt_free_bc_rqst, + .bc_destroy = xprt_destroy_bc, +#endif +}; + +/* + * The rpc_xprt_ops for the server backchannel + */ + +static const struct rpc_xprt_ops bc_tcp_ops = { + .reserve_xprt = xprt_reserve_xprt, + .release_xprt = xprt_release_xprt, + .alloc_slot = xprt_alloc_slot, + .free_slot = xprt_free_slot, + .buf_alloc = bc_malloc, + .buf_free = bc_free, + .send_request = bc_send_request, + .wait_for_reply_request = xprt_wait_for_reply_request_def, + .close = bc_close, + .destroy = bc_destroy, + .print_stats = xs_tcp_print_stats, + .enable_swap = xs_enable_swap, + .disable_swap = xs_disable_swap, + .inject_disconnect = xs_inject_disconnect, +}; + +static int xs_init_anyaddr(const int family, struct sockaddr *sap) +{ + static const struct sockaddr_in sin = { + .sin_family = AF_INET, + .sin_addr.s_addr = htonl(INADDR_ANY), + }; + static const struct sockaddr_in6 sin6 = { + .sin6_family = AF_INET6, + .sin6_addr = IN6ADDR_ANY_INIT, + }; + + switch (family) { + case AF_LOCAL: + break; + case AF_INET: + memcpy(sap, &sin, sizeof(sin)); + break; + case AF_INET6: + memcpy(sap, &sin6, sizeof(sin6)); + break; + default: + dprintk("RPC: %s: Bad address family\n", __func__); + return -EAFNOSUPPORT; + } + return 0; +} + +static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, + unsigned int slot_table_size, + unsigned int max_slot_table_size) +{ + struct rpc_xprt *xprt; + struct sock_xprt *new; + + if (args->addrlen > sizeof(xprt->addr)) { + dprintk("RPC: xs_setup_xprt: address too large\n"); + return ERR_PTR(-EBADF); + } + + xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, + max_slot_table_size); + if (xprt == NULL) { + dprintk("RPC: xs_setup_xprt: couldn't allocate " + "rpc_xprt\n"); + return ERR_PTR(-ENOMEM); + } + + new = container_of(xprt, struct sock_xprt, xprt); + mutex_init(&new->recv_mutex); + memcpy(&xprt->addr, args->dstaddr, args->addrlen); + xprt->addrlen = args->addrlen; + if (args->srcaddr) + memcpy(&new->srcaddr, args->srcaddr, args->addrlen); + else { + int err; + err = xs_init_anyaddr(args->dstaddr->sa_family, + (struct sockaddr *)&new->srcaddr); + if (err != 0) { + xprt_free(xprt); + return ERR_PTR(err); + } + } + + return xprt; +} + +static const struct rpc_timeout xs_local_default_timeout = { + .to_initval = 10 * HZ, + .to_maxval = 10 * HZ, + .to_retries = 2, +}; + +/** + * xs_setup_local - Set up transport to use an AF_LOCAL socket + * @args: rpc transport creation arguments + * + * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP + */ +static struct rpc_xprt *xs_setup_local(struct xprt_create *args) +{ + struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; + struct sock_xprt *transport; + struct rpc_xprt *xprt; + struct rpc_xprt *ret; + + xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, + xprt_max_tcp_slot_table_entries); + if (IS_ERR(xprt)) + return xprt; + transport = container_of(xprt, struct sock_xprt, xprt); + + xprt->prot = 0; + xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; + + xprt->bind_timeout = XS_BIND_TO; + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; + xprt->idle_timeout = XS_IDLE_DISC_TO; + + xprt->ops = &xs_local_ops; + xprt->timeout = &xs_local_default_timeout; + + INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); + INIT_WORK(&transport->error_worker, xs_error_handle); + INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket); + + switch (sun->sun_family) { + case AF_LOCAL: + if (sun->sun_path[0] != '/') { + dprintk("RPC: bad AF_LOCAL address: %s\n", + sun->sun_path); + ret = ERR_PTR(-EINVAL); + goto out_err; + } + xprt_set_bound(xprt); + xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); + break; + default: + ret = ERR_PTR(-EAFNOSUPPORT); + goto out_err; + } + + dprintk("RPC: set up xprt to %s via AF_LOCAL\n", + xprt->address_strings[RPC_DISPLAY_ADDR]); + + if (try_module_get(THIS_MODULE)) + return xprt; + ret = ERR_PTR(-EINVAL); +out_err: + xs_xprt_free(xprt); + return ret; +} + +static const struct rpc_timeout xs_udp_default_timeout = { + .to_initval = 5 * HZ, + .to_maxval = 30 * HZ, + .to_increment = 5 * HZ, + .to_retries = 5, +}; + +/** + * xs_setup_udp - Set up transport to use a UDP socket + * @args: rpc transport creation arguments + * + */ +static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) +{ + struct sockaddr *addr = args->dstaddr; + struct rpc_xprt *xprt; + struct sock_xprt *transport; + struct rpc_xprt *ret; + + xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, + xprt_udp_slot_table_entries); + if (IS_ERR(xprt)) + return xprt; + transport = container_of(xprt, struct sock_xprt, xprt); + + xprt->prot = IPPROTO_UDP; + /* XXX: header size can vary due to auth type, IPv6, etc. */ + xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); + + xprt->bind_timeout = XS_BIND_TO; + xprt->reestablish_timeout = XS_UDP_REEST_TO; + xprt->idle_timeout = XS_IDLE_DISC_TO; + + xprt->ops = &xs_udp_ops; + + xprt->timeout = &xs_udp_default_timeout; + + INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); + INIT_WORK(&transport->error_worker, xs_error_handle); + INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); + + switch (addr->sa_family) { + case AF_INET: + if (((struct sockaddr_in *)addr)->sin_port != htons(0)) + xprt_set_bound(xprt); + + xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); + break; + case AF_INET6: + if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) + xprt_set_bound(xprt); + + xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); + break; + default: + ret = ERR_PTR(-EAFNOSUPPORT); + goto out_err; + } + + if (xprt_bound(xprt)) + dprintk("RPC: set up xprt to %s (port %s) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT], + xprt->address_strings[RPC_DISPLAY_PROTO]); + else + dprintk("RPC: set up xprt to %s (autobind) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PROTO]); + + if (try_module_get(THIS_MODULE)) + return xprt; + ret = ERR_PTR(-EINVAL); +out_err: + xs_xprt_free(xprt); + return ret; +} + +static const struct rpc_timeout xs_tcp_default_timeout = { + .to_initval = 60 * HZ, + .to_maxval = 60 * HZ, + .to_retries = 2, +}; + +/** + * xs_setup_tcp - Set up transport to use a TCP socket + * @args: rpc transport creation arguments + * + */ +static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) +{ + struct sockaddr *addr = args->dstaddr; + struct rpc_xprt *xprt; + struct sock_xprt *transport; + struct rpc_xprt *ret; + unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; + + if (args->flags & XPRT_CREATE_INFINITE_SLOTS) + max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; + + xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, + max_slot_table_size); + if (IS_ERR(xprt)) + return xprt; + transport = container_of(xprt, struct sock_xprt, xprt); + + xprt->prot = IPPROTO_TCP; + xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; + + xprt->bind_timeout = XS_BIND_TO; + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; + xprt->idle_timeout = XS_IDLE_DISC_TO; + + xprt->ops = &xs_tcp_ops; + xprt->timeout = &xs_tcp_default_timeout; + + xprt->max_reconnect_timeout = xprt->timeout->to_maxval; + xprt->connect_timeout = xprt->timeout->to_initval * + (xprt->timeout->to_retries + 1); + + INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); + INIT_WORK(&transport->error_worker, xs_error_handle); + INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); + + switch (addr->sa_family) { + case AF_INET: + if (((struct sockaddr_in *)addr)->sin_port != htons(0)) + xprt_set_bound(xprt); + + xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); + break; + case AF_INET6: + if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) + xprt_set_bound(xprt); + + xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); + break; + default: + ret = ERR_PTR(-EAFNOSUPPORT); + goto out_err; + } + + if (xprt_bound(xprt)) + dprintk("RPC: set up xprt to %s (port %s) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT], + xprt->address_strings[RPC_DISPLAY_PROTO]); + else + dprintk("RPC: set up xprt to %s (autobind) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PROTO]); + + if (try_module_get(THIS_MODULE)) + return xprt; + ret = ERR_PTR(-EINVAL); +out_err: + xs_xprt_free(xprt); + return ret; +} + +/** + * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket + * @args: rpc transport creation arguments + * + */ +static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) +{ + struct sockaddr *addr = args->dstaddr; + struct rpc_xprt *xprt; + struct sock_xprt *transport; + struct svc_sock *bc_sock; + struct rpc_xprt *ret; + + xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, + xprt_tcp_slot_table_entries); + if (IS_ERR(xprt)) + return xprt; + transport = container_of(xprt, struct sock_xprt, xprt); + + xprt->prot = IPPROTO_TCP; + xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; + xprt->timeout = &xs_tcp_default_timeout; + + /* backchannel */ + xprt_set_bound(xprt); + xprt->bind_timeout = 0; + xprt->reestablish_timeout = 0; + xprt->idle_timeout = 0; + + xprt->ops = &bc_tcp_ops; + + switch (addr->sa_family) { + case AF_INET: + xs_format_peer_addresses(xprt, "tcp", + RPCBIND_NETID_TCP); + break; + case AF_INET6: + xs_format_peer_addresses(xprt, "tcp", + RPCBIND_NETID_TCP6); + break; + default: + ret = ERR_PTR(-EAFNOSUPPORT); + goto out_err; + } + + dprintk("RPC: set up xprt to %s (port %s) via %s\n", + xprt->address_strings[RPC_DISPLAY_ADDR], + xprt->address_strings[RPC_DISPLAY_PORT], + xprt->address_strings[RPC_DISPLAY_PROTO]); + + /* + * Once we've associated a backchannel xprt with a connection, + * we want to keep it around as long as the connection lasts, + * in case we need to start using it for a backchannel again; + * this reference won't be dropped until bc_xprt is destroyed. + */ + xprt_get(xprt); + args->bc_xprt->xpt_bc_xprt = xprt; + xprt->bc_xprt = args->bc_xprt; + bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); + transport->sock = bc_sock->sk_sock; + transport->inet = bc_sock->sk_sk; + + /* + * Since we don't want connections for the backchannel, we set + * the xprt status to connected + */ + xprt_set_connected(xprt); + + if (try_module_get(THIS_MODULE)) + return xprt; + + args->bc_xprt->xpt_bc_xprt = NULL; + args->bc_xprt->xpt_bc_xps = NULL; + xprt_put(xprt); + ret = ERR_PTR(-EINVAL); +out_err: + xs_xprt_free(xprt); + return ret; +} + +static struct xprt_class xs_local_transport = { + .list = LIST_HEAD_INIT(xs_local_transport.list), + .name = "named UNIX socket", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_LOCAL, + .setup = xs_setup_local, + .netid = { "" }, +}; + +static struct xprt_class xs_udp_transport = { + .list = LIST_HEAD_INIT(xs_udp_transport.list), + .name = "udp", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_UDP, + .setup = xs_setup_udp, + .netid = { "udp", "udp6", "" }, +}; + +static struct xprt_class xs_tcp_transport = { + .list = LIST_HEAD_INIT(xs_tcp_transport.list), + .name = "tcp", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_TCP, + .setup = xs_setup_tcp, + .netid = { "tcp", "tcp6", "" }, +}; + +static struct xprt_class xs_bc_tcp_transport = { + .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), + .name = "tcp NFSv4.1 backchannel", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_BC_TCP, + .setup = xs_setup_bc_tcp, + .netid = { "" }, +}; + +/** + * init_socket_xprt - set up xprtsock's sysctls, register with RPC client + * + */ +int init_socket_xprt(void) +{ + if (!sunrpc_table_header) + sunrpc_table_header = register_sysctl_table(sunrpc_table); + + xprt_register_transport(&xs_local_transport); + xprt_register_transport(&xs_udp_transport); + xprt_register_transport(&xs_tcp_transport); + xprt_register_transport(&xs_bc_tcp_transport); + + return 0; +} + +/** + * cleanup_socket_xprt - remove xprtsock's sysctls, unregister + * + */ +void cleanup_socket_xprt(void) +{ + if (sunrpc_table_header) { + unregister_sysctl_table(sunrpc_table_header); + sunrpc_table_header = NULL; + } + + xprt_unregister_transport(&xs_local_transport); + xprt_unregister_transport(&xs_udp_transport); + xprt_unregister_transport(&xs_tcp_transport); + xprt_unregister_transport(&xs_bc_tcp_transport); +} + +static int param_set_uint_minmax(const char *val, + const struct kernel_param *kp, + unsigned int min, unsigned int max) +{ + unsigned int num; + int ret; + + if (!val) + return -EINVAL; + ret = kstrtouint(val, 0, &num); + if (ret) + return ret; + if (num < min || num > max) + return -EINVAL; + *((unsigned int *)kp->arg) = num; + return 0; +} + +static int param_set_portnr(const char *val, const struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, + RPC_MIN_RESVPORT, + RPC_MAX_RESVPORT); +} + +static const struct kernel_param_ops param_ops_portnr = { + .set = param_set_portnr, + .get = param_get_uint, +}; + +#define param_check_portnr(name, p) \ + __param_check(name, p, unsigned int); + +module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); +module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); + +static int param_set_slot_table_size(const char *val, + const struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, + RPC_MIN_SLOT_TABLE, + RPC_MAX_SLOT_TABLE); +} + +static const struct kernel_param_ops param_ops_slot_table_size = { + .set = param_set_slot_table_size, + .get = param_get_uint, +}; + +#define param_check_slot_table_size(name, p) \ + __param_check(name, p, unsigned int); + +static int param_set_max_slot_table_size(const char *val, + const struct kernel_param *kp) +{ + return param_set_uint_minmax(val, kp, + RPC_MIN_SLOT_TABLE, + RPC_MAX_SLOT_TABLE_LIMIT); +} + +static const struct kernel_param_ops param_ops_max_slot_table_size = { + .set = param_set_max_slot_table_size, + .get = param_get_uint, +}; + +#define param_check_max_slot_table_size(name, p) \ + __param_check(name, p, unsigned int); + +module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, + slot_table_size, 0644); +module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, + max_slot_table_size, 0644); +module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, + slot_table_size, 0644); |