blob: c69951ed2ebc184a83db59983e856fb333de5b96 [file] [log] [blame]
// 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 "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);
offset += ret - buf->page_base;
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, uninitialized_var(read);
ssize_t uninitialized_var(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;
}
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);
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) {
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);
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)
static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek)
{
if (seek)
iov_iter_advance(&msg->msg_iter, seek);
return sock_sendmsg(sock, msg);
}
static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek)
{
iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len);
return xs_sendmsg(sock, msg, seek);
}
static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base)
{
int err;
err = xdr_alloc_bvec(xdr, GFP_KERNEL);
if (err < 0)
return err;
iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec,
xdr_buf_pagecount(xdr),
xdr->page_len + xdr->page_base);
return xs_sendmsg(sock, msg, base + xdr->page_base);
}
#define xs_record_marker_len() sizeof(rpc_fraghdr)
/* Common case:
* - stream transport
* - sending from byte 0 of the message
* - the message is wholly contained in @xdr's head iovec
*/
static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg,
rpc_fraghdr marker, struct kvec *vec, size_t base)
{
struct kvec iov[2] = {
[0] = {
.iov_base = &marker,
.iov_len = sizeof(marker)
},
[1] = *vec,
};
size_t len = iov[0].iov_len + iov[1].iov_len;
iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len);
return xs_sendmsg(sock, msg, base);
}
/**
* xs_sendpages - write pages directly to a socket
* @sock: socket to send on
* @addr: UDP only -- address of destination
* @addrlen: UDP only -- length of destination address
* @xdr: buffer containing this request
* @base: starting position in the buffer
* @rm: stream record marker field
* @sent_p: return the total number of bytes successfully queued for sending
*
*/
static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p)
{
struct msghdr msg = {
.msg_name = addr,
.msg_namelen = addrlen,
.msg_flags = XS_SENDMSG_FLAGS | MSG_MORE,
};
unsigned int rmsize = rm ? sizeof(rm) : 0;
unsigned int remainder = rmsize + xdr->len - base;
unsigned int want;
int err = 0;
if (unlikely(!sock))
return -ENOTSOCK;
want = xdr->head[0].iov_len + rmsize;
if (base < want) {
unsigned int len = want - base;
remainder -= len;
if (remainder == 0)
msg.msg_flags &= ~MSG_MORE;
if (rmsize)
err = xs_send_rm_and_kvec(sock, &msg, rm,
&xdr->head[0], base);
else
err = xs_send_kvec(sock, &msg, &xdr->head[0], base);
if (remainder == 0 || err != len)
goto out;
*sent_p += err;
base = 0;
} else
base -= want;
if (base < xdr->page_len) {
unsigned int len = xdr->page_len - base;
remainder -= len;
if (remainder == 0)
msg.msg_flags &= ~MSG_MORE;
err = xs_send_pagedata(sock, &msg, xdr, base);
if (remainder == 0 || err != len)
goto out;
*sent_p += err;
base = 0;
} else
base -= xdr->page_len;
if (base >= xdr->tail[0].iov_len)
return 0;
msg.msg_flags &= ~MSG_MORE;
err = xs_send_kvec(sock, &msg, &xdr->tail[0], base);
out:
if (err > 0) {
*sent_p += err;
err = 0;
}
return err;
}
/**
* xs_nospace - handle transmit was incomplete
* @req: pointer to RPC request
*
*/
static int xs_nospace(struct rpc_rqst *req)
{
struct rpc_xprt *xprt = req->rq_xprt;
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
struct sock *sk = transport->inet;
int ret = -EAGAIN;
dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
req->rq_task->tk_pid,
req->rq_slen - transport->xmit.offset,
req->rq_slen);
/* Protect against races with write_space */
spin_lock_bh(&xprt->transport_lock);
/* Don't race with disconnect */
if (xprt_connected(xprt)) {
/* wait for more buffer space */
sk->sk_write_pending++;
xprt_wait_for_buffer_space(xprt);
} else
ret = -ENOTCONN;
spin_unlock_bh(&xprt->transport_lock);
/* Race breaker in case memory is freed before above code is called */
if (ret == -EAGAIN) {
struct socket_wq *wq;
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
rcu_read_unlock();
sk->sk_write_space(sk);
}
return ret;
}
static void
xs_stream_prepare_request(struct rpc_rqst *req)
{
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;
int status;
int sent = 0;
/* Close the stream if the previous transmission was incomplete */
if (xs_send_request_was_aborted(transport, req)) {
xs_close(xprt);
return -ENOTCONN;
}
xs_pktdump("packet data:",
req->rq_svec->iov_base, req->rq_svec->iov_len);
req->rq_xtime = ktime_get();
status = xs_sendpages(transport->sock, NULL, 0, xdr,
transport->xmit.offset,
xs_stream_record_marker(xdr),
&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 >= req->rq_slen)) {
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_nospace(req);
break;
default:
dprintk("RPC: sendmsg returned unrecognized error %d\n",
-status);
/* fall through */
case -EPIPE:
xs_close(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;
int sent = 0;
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 = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
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_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;
bool vm_wait = false;
int status;
int sent;
/* 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) {
sent = 0;
status = xs_sendpages(transport->sock, NULL, 0, xdr,
transport->xmit.offset,
xs_stream_record_marker(xdr),
&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 >= req->rq_slen)) {
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_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);
}
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 rpc_xprt *xprt;
int err;
read_lock_bh(&sk->sk_callback_lock);
if (!(xprt = xprt_from_sock(sk)))
goto out;
err = -sk->sk_err;
if (err == 0)
goto out;
dprintk("RPC: xs_error_report client %p, error=%d...\n",
xprt, -err);
trace_rpc_socket_error(xprt, sk->sk_socket, err);
xprt_wake_pending_tasks(xprt, err);
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;
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(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);
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_bh(&xprt->transport_lock);
xprt_adjust_cwnd(xprt, task, copied);
spin_unlock_bh(&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:
spin_lock(&xprt->transport_lock);
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;
xprt_wake_pending_tasks(xprt, -EAGAIN);
}
spin_unlock(&xprt->transport_lock);
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_tcp_force_close(xprt);
/* fall through */
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_tcp_force_close(xprt);
}
out:
read_unlock_bh(&sk->sk_callback_lock);
}
static void xs_write_space(struct sock *sk)
{
struct socket_wq *wq;
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;
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
goto out;
if (xprt_write_space(xprt))
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_bh(&xprt->transport_lock);
xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
spin_unlock_bh(&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;
}
/**
* xs_set_reuseaddr_port - set the socket's port and address reuse options
* @sock: socket
*
* Note that this function has to be called on all sockets that share the
* same port, and it must be called before binding.
*/
static void xs_sock_set_reuseport(struct socket *sock)
{
int opt = 1;
kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
(char *)&opt, sizeof(opt));
}
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->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;
}
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) {
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)
xs_sock_set_reuseport(sock);
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 = -EIO;
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);
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 opt_on = 1;
unsigned int timeo;
spin_lock_bh(&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_bh(&xprt->transport_lock);
/* TCP Keepalive options */
kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
(char *)&opt_on, sizeof(opt_on));
kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
(char *)&keepidle, sizeof(keepidle));
kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
(char *)&keepidle, sizeof(keepidle));
kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
(char *)&keepcnt, sizeof(keepcnt));
/* TCP user timeout (see RFC5482) */
kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
(char *)&timeo, sizeof(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_bh(&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_bh(&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;
unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
/* 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.
*/
kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
(char *)&addr_pref, sizeof(addr_pref));
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);
/* fall through */
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 (!sock) {
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);
/* fall through */
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:
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);
}
static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
{
unsigned long start, now = jiffies;
start = xprt->stat.connect_start + xprt->reestablish_timeout;
if (time_after(start, now))
return start - now;
return 0;
}
static void xs_reconnect_backoff(struct rpc_xprt *xprt)
{
xprt->reestablish_timeout <<= 1;
if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
xprt->reestablish_timeout = xprt->max_reconnect_timeout;
if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
}
/**
* 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);
/* Start by resetting any existing state */
xs_reset_transport(transport);
delay = xs_reconnect_delay(xprt);
xs_reconnect_backoff(xprt);
} else
dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
queue_delayed_work(xprtiod_workqueue,
&transport->connect_worker,
delay);
}
/**
* 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);
}
/*
* Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
* held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
*/
static int bc_sendto(struct rpc_rqst *req)
{
int len;
struct xdr_buf *xbufp = &req->rq_snd_buf;
struct sock_xprt *transport =
container_of(req->rq_xprt, struct sock_xprt, xprt);
unsigned long headoff;
unsigned long tailoff;
struct page *tailpage;
struct msghdr msg = {
.msg_flags = MSG_MORE
};
rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
(u32)xbufp->len);
struct kvec iov = {
.iov_base = &marker,
.iov_len = sizeof(marker),
};
len = kernel_sendmsg(transport->sock, &msg, &iov, 1, iov.iov_len);
if (len != iov.iov_len)
return -EAGAIN;
tailpage = NULL;
if (xbufp->tail[0].iov_len)
tailpage = virt_to_page(xbufp->tail[0].iov_base);
tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
len = svc_send_common(transport->sock, xbufp,
virt_to_page(xbufp->head[0].iov_base), headoff,
tailpage, tailoff);
if (len != xbufp->len)
return -EAGAIN;
return len;
}
/*
* The send routine. Borrows from svc_send
*/
static int bc_send_request(struct rpc_rqst *req)
{
struct svc_xprt *xprt;
int len;
dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
/*
* 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)
{
}
/*
* 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_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),