You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
3337 lines
87 KiB
3337 lines
87 KiB
/*
|
|
* 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 <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;
|
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
|
|
#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
|
|
},
|
|
{
|
|
.procname = "max_resvport",
|
|
.data = &xprt_max_resvport,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &xprt_min_resvport,
|
|
.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
|
|
},
|
|
{ },
|
|
};
|
|
|
|
#endif
|
|
|
|
/*
|
|
* 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]);
|
|
}
|
|
}
|
|
|
|
#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
|
|
|
|
static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
|
|
{
|
|
struct msghdr msg = {
|
|
.msg_name = addr,
|
|
.msg_namelen = addrlen,
|
|
.msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
|
|
};
|
|
struct kvec iov = {
|
|
.iov_base = vec->iov_base + base,
|
|
.iov_len = vec->iov_len - base,
|
|
};
|
|
|
|
if (iov.iov_len != 0)
|
|
return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
|
|
return kernel_sendmsg(sock, &msg, NULL, 0, 0);
|
|
}
|
|
|
|
static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
|
|
{
|
|
ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
|
|
int offset, size_t size, int flags);
|
|
struct page **ppage;
|
|
unsigned int remainder;
|
|
int err;
|
|
|
|
remainder = xdr->page_len - base;
|
|
base += xdr->page_base;
|
|
ppage = xdr->pages + (base >> PAGE_SHIFT);
|
|
base &= ~PAGE_MASK;
|
|
do_sendpage = sock->ops->sendpage;
|
|
if (!zerocopy)
|
|
do_sendpage = sock_no_sendpage;
|
|
for(;;) {
|
|
unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
|
|
int flags = XS_SENDMSG_FLAGS;
|
|
|
|
remainder -= len;
|
|
if (more)
|
|
flags |= MSG_MORE;
|
|
if (remainder != 0)
|
|
flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
|
|
err = do_sendpage(sock, *ppage, base, len, flags);
|
|
if (remainder == 0 || err != len)
|
|
break;
|
|
*sent_p += err;
|
|
ppage++;
|
|
base = 0;
|
|
}
|
|
if (err > 0) {
|
|
*sent_p += err;
|
|
err = 0;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @zerocopy: true if it is safe to use sendpage()
|
|
* @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, bool zerocopy, int *sent_p)
|
|
{
|
|
unsigned int remainder = xdr->len - base;
|
|
int err = 0;
|
|
int sent = 0;
|
|
|
|
if (unlikely(!sock))
|
|
return -ENOTSOCK;
|
|
|
|
if (base != 0) {
|
|
addr = NULL;
|
|
addrlen = 0;
|
|
}
|
|
|
|
if (base < xdr->head[0].iov_len || addr != NULL) {
|
|
unsigned int len = xdr->head[0].iov_len - base;
|
|
remainder -= len;
|
|
err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
|
|
if (remainder == 0 || err != len)
|
|
goto out;
|
|
*sent_p += err;
|
|
base = 0;
|
|
} else
|
|
base -= xdr->head[0].iov_len;
|
|
|
|
if (base < xdr->page_len) {
|
|
unsigned int len = xdr->page_len - base;
|
|
remainder -= len;
|
|
err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
|
|
*sent_p += sent;
|
|
if (remainder == 0 || sent != len)
|
|
goto out;
|
|
base = 0;
|
|
} else
|
|
base -= xdr->page_len;
|
|
|
|
if (base >= xdr->tail[0].iov_len)
|
|
return 0;
|
|
err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
|
|
out:
|
|
if (err > 0) {
|
|
*sent_p += err;
|
|
err = 0;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void xs_nospace_callback(struct rpc_task *task)
|
|
{
|
|
struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
|
|
|
|
transport->inet->sk_write_pending--;
|
|
}
|
|
|
|
/**
|
|
* xs_nospace - place task on wait queue if transmit was incomplete
|
|
* @task: task to put to sleep
|
|
*
|
|
*/
|
|
static int xs_nospace(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
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",
|
|
task->tk_pid, req->rq_slen - req->rq_bytes_sent,
|
|
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(task, xs_nospace_callback);
|
|
} 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;
|
|
}
|
|
|
|
/*
|
|
* Construct a stream transport record marker in @buf.
|
|
*/
|
|
static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
|
|
{
|
|
u32 reclen = buf->len - sizeof(rpc_fraghdr);
|
|
rpc_fraghdr *base = buf->head[0].iov_base;
|
|
*base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
|
|
}
|
|
|
|
/**
|
|
* xs_local_send_request - write an RPC request to an AF_LOCAL socket
|
|
* @task: RPC task that manages the state of an 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_task *task)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
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;
|
|
|
|
xs_encode_stream_record_marker(&req->rq_snd_buf);
|
|
|
|
xs_pktdump("packet data:",
|
|
req->rq_svec->iov_base, req->rq_svec->iov_len);
|
|
|
|
status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
|
|
true, &sent);
|
|
dprintk("RPC: %s(%u) = %d\n",
|
|
__func__, xdr->len - req->rq_bytes_sent, status);
|
|
|
|
if (status == -EAGAIN && sock_writeable(transport->inet))
|
|
status = -ENOBUFS;
|
|
|
|
if (likely(sent > 0) || status == 0) {
|
|
req->rq_bytes_sent += sent;
|
|
req->rq_xmit_bytes_sent += sent;
|
|
if (likely(req->rq_bytes_sent >= req->rq_slen)) {
|
|
req->rq_bytes_sent = 0;
|
|
return 0;
|
|
}
|
|
status = -EAGAIN;
|
|
}
|
|
|
|
switch (status) {
|
|
case -ENOBUFS:
|
|
break;
|
|
case -EAGAIN:
|
|
status = xs_nospace(task);
|
|
break;
|
|
default:
|
|
dprintk("RPC: sendmsg returned unrecognized error %d\n",
|
|
-status);
|
|
case -EPIPE:
|
|
xs_close(xprt);
|
|
status = -ENOTCONN;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* xs_udp_send_request - write an RPC request to a UDP socket
|
|
* @task: address of RPC task that manages the state of an 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_task *task)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
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;
|
|
status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
|
|
xdr, req->rq_bytes_sent, true, &sent);
|
|
|
|
dprintk("RPC: xs_udp_send_request(%u) = %d\n",
|
|
xdr->len - req->rq_bytes_sent, 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(task);
|
|
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
|
|
* @task: address of RPC task that manages the state of an 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_task *task)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
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 zerocopy = true;
|
|
bool vm_wait = false;
|
|
int status;
|
|
int sent;
|
|
|
|
xs_encode_stream_record_marker(&req->rq_snd_buf);
|
|
|
|
xs_pktdump("packet data:",
|
|
req->rq_svec->iov_base,
|
|
req->rq_svec->iov_len);
|
|
/* Don't use zero copy if this is a resend. If the RPC call
|
|
* completes while the socket holds a reference to the pages,
|
|
* then we may end up resending corrupted data.
|
|
*/
|
|
if (task->tk_flags & RPC_TASK_SENT)
|
|
zerocopy = false;
|
|
|
|
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(). */
|
|
while (1) {
|
|
sent = 0;
|
|
status = xs_sendpages(transport->sock, NULL, 0, xdr,
|
|
req->rq_bytes_sent, zerocopy, &sent);
|
|
|
|
dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
|
|
xdr->len - req->rq_bytes_sent, status);
|
|
|
|
/* If we've sent the entire packet, immediately
|
|
* reset the count of bytes sent. */
|
|
req->rq_bytes_sent += sent;
|
|
req->rq_xmit_bytes_sent += sent;
|
|
if (likely(req->rq_bytes_sent >= req->rq_slen)) {
|
|
req->rq_bytes_sent = 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(task);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* xs_tcp_release_xprt - clean up after a tcp transmission
|
|
* @xprt: transport
|
|
* @task: rpc task
|
|
*
|
|
* This cleans up if an error causes us to abort the transmission of a request.
|
|
* In this case, the socket may need to be reset in order to avoid confusing
|
|
* the server.
|
|
*/
|
|
static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *req;
|
|
|
|
if (task != xprt->snd_task)
|
|
return;
|
|
if (task == NULL)
|
|
goto out_release;
|
|
req = task->tk_rqstp;
|
|
if (req == NULL)
|
|
goto out_release;
|
|
if (req->rq_bytes_sent == 0)
|
|
goto out_release;
|
|
if (req->rq_bytes_sent == req->rq_snd_buf.len)
|
|
goto out_release;
|
|
set_bit(XPRT_CLOSE_WAIT, &xprt->state);
|
|
out_release:
|
|
xprt_release_xprt(xprt, task);
|
|
}
|
|
|
|
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();
|
|
}
|
|
|
|
static void xs_sock_mark_closed(struct rpc_xprt *xprt)
|
|
{
|
|
xs_sock_reset_connection_flags(xprt);
|
|
/* Mark transport as closed and wake up all pending tasks */
|
|
xprt_disconnect_done(xprt);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
/* Is this a reset event? */
|
|
if (sk->sk_state == TCP_CLOSE)
|
|
xs_sock_mark_closed(xprt);
|
|
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;
|
|
|
|
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;
|
|
|
|
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);
|
|
mutex_unlock(&transport->recv_mutex);
|
|
|
|
trace_rpc_socket_close(xprt, sock);
|
|
sock_release(sock);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
xprt_disconnect_done(xprt);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
|
|
{
|
|
struct xdr_skb_reader desc = {
|
|
.skb = skb,
|
|
.offset = sizeof(rpc_fraghdr),
|
|
.count = skb->len - sizeof(rpc_fraghdr),
|
|
};
|
|
|
|
if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
|
|
return -1;
|
|
if (desc.count)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* xs_local_data_read_skb
|
|
* @xprt: transport
|
|
* @sk: socket
|
|
* @skb: skbuff
|
|
*
|
|
* Currently this assumes we can read the whole reply in a single gulp.
|
|
*/
|
|
static void xs_local_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 - sizeof(rpc_fraghdr);
|
|
if (repsize < 4) {
|
|
dprintk("RPC: impossible RPC reply size %d\n", repsize);
|
|
return;
|
|
}
|
|
|
|
/* Copy the XID from the skb... */
|
|
xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
|
|
if (xp == NULL)
|
|
return;
|
|
|
|
/* Look up and lock the request corresponding to the given XID */
|
|
spin_lock_bh(&xprt->transport_lock);
|
|
rovr = xprt_lookup_rqst(xprt, *xp);
|
|
if (!rovr)
|
|
goto out_unlock;
|
|
task = rovr->rq_task;
|
|
|
|
copied = rovr->rq_private_buf.buflen;
|
|
if (copied > repsize)
|
|
copied = repsize;
|
|
|
|
if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
|
|
dprintk("RPC: sk_buff copy failed\n");
|
|
goto out_unlock;
|
|
}
|
|
|
|
xprt_complete_rqst(task, copied);
|
|
|
|
out_unlock:
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
}
|
|
|
|
static void xs_local_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_datagram(sk, 0, 1, &err);
|
|
if (skb != NULL) {
|
|
xs_local_data_read_skb(&transport->xprt, sk, skb);
|
|
skb_free_datagram(sk, skb);
|
|
continue;
|
|
}
|
|
if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
|
|
break;
|
|
}
|
|
out:
|
|
mutex_unlock(&transport->recv_mutex);
|
|
}
|
|
|
|
static void xs_local_data_receive_workfn(struct work_struct *work)
|
|
{
|
|
struct sock_xprt *transport =
|
|
container_of(work, struct sock_xprt, recv_worker);
|
|
xs_local_data_receive(transport);
|
|
}
|
|
|
|
/**
|
|
* 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_bh(&xprt->transport_lock);
|
|
rovr = xprt_lookup_rqst(xprt, *xp);
|
|
if (!rovr)
|
|
goto out_unlock;
|
|
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)) {
|
|
__UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
|
|
goto out_unlock;
|
|
}
|
|
|
|
__UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
|
|
|
|
xprt_adjust_cwnd(xprt, task, copied);
|
|
xprt_complete_rqst(task, copied);
|
|
|
|
out_unlock:
|
|
spin_unlock_bh(&xprt->transport_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) {
|
|
xs_udp_data_read_skb(&transport->xprt, sk, skb);
|
|
consume_skb(skb);
|
|
continue;
|
|
}
|
|
if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
|
|
break;
|
|
}
|
|
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);
|
|
xs_udp_data_receive(transport);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
|
|
{
|
|
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
|
|
size_t len, used;
|
|
char *p;
|
|
|
|
p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
|
|
len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
|
|
used = xdr_skb_read_bits(desc, p, len);
|
|
transport->tcp_offset += used;
|
|
if (used != len)
|
|
return;
|
|
|
|
transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
|
|
if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
|
|
transport->tcp_flags |= TCP_RCV_LAST_FRAG;
|
|
else
|
|
transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
|
|
transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
|
|
|
|
transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
|
|
transport->tcp_offset = 0;
|
|
|
|
/* Sanity check of the record length */
|
|
if (unlikely(transport->tcp_reclen < 8)) {
|
|
dprintk("RPC: invalid TCP record fragment length\n");
|
|
xs_tcp_force_close(xprt);
|
|
return;
|
|
}
|
|
dprintk("RPC: reading TCP record fragment of length %d\n",
|
|
transport->tcp_reclen);
|
|
}
|
|
|
|
static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
|
|
{
|
|
if (transport->tcp_offset == transport->tcp_reclen) {
|
|
transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
|
|
transport->tcp_offset = 0;
|
|
if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
|
|
transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
|
|
transport->tcp_flags |= TCP_RCV_COPY_XID;
|
|
transport->tcp_copied = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
|
|
{
|
|
size_t len, used;
|
|
char *p;
|
|
|
|
len = sizeof(transport->tcp_xid) - transport->tcp_offset;
|
|
dprintk("RPC: reading XID (%zu bytes)\n", len);
|
|
p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
|
|
used = xdr_skb_read_bits(desc, p, len);
|
|
transport->tcp_offset += used;
|
|
if (used != len)
|
|
return;
|
|
transport->tcp_flags &= ~TCP_RCV_COPY_XID;
|
|
transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
|
|
transport->tcp_copied = 4;
|
|
dprintk("RPC: reading %s XID %08x\n",
|
|
(transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
|
|
: "request with",
|
|
ntohl(transport->tcp_xid));
|
|
xs_tcp_check_fraghdr(transport);
|
|
}
|
|
|
|
static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
|
|
struct xdr_skb_reader *desc)
|
|
{
|
|
size_t len, used;
|
|
u32 offset;
|
|
char *p;
|
|
|
|
/*
|
|
* We want transport->tcp_offset to be 8 at the end of this routine
|
|
* (4 bytes for the xid and 4 bytes for the call/reply flag).
|
|
* When this function is called for the first time,
|
|
* transport->tcp_offset is 4 (after having already read the xid).
|
|
*/
|
|
offset = transport->tcp_offset - sizeof(transport->tcp_xid);
|
|
len = sizeof(transport->tcp_calldir) - offset;
|
|
dprintk("RPC: reading CALL/REPLY flag (%zu bytes)\n", len);
|
|
p = ((char *) &transport->tcp_calldir) + offset;
|
|
used = xdr_skb_read_bits(desc, p, len);
|
|
transport->tcp_offset += used;
|
|
if (used != len)
|
|
return;
|
|
transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
|
|
/*
|
|
* We don't yet have the XDR buffer, so we will write the calldir
|
|
* out after we get the buffer from the 'struct rpc_rqst'
|
|
*/
|
|
switch (ntohl(transport->tcp_calldir)) {
|
|
case RPC_REPLY:
|
|
transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
|
|
transport->tcp_flags |= TCP_RCV_COPY_DATA;
|
|
transport->tcp_flags |= TCP_RPC_REPLY;
|
|
break;
|
|
case RPC_CALL:
|
|
transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
|
|
transport->tcp_flags |= TCP_RCV_COPY_DATA;
|
|
transport->tcp_flags &= ~TCP_RPC_REPLY;
|
|
break;
|
|
default:
|
|
dprintk("RPC: invalid request message type\n");
|
|
xs_tcp_force_close(&transport->xprt);
|
|
}
|
|
xs_tcp_check_fraghdr(transport);
|
|
}
|
|
|
|
static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
|
|
struct xdr_skb_reader *desc,
|
|
struct rpc_rqst *req)
|
|
{
|
|
struct sock_xprt *transport =
|
|
container_of(xprt, struct sock_xprt, xprt);
|
|
struct xdr_buf *rcvbuf;
|
|
size_t len;
|
|
ssize_t r;
|
|
|
|
rcvbuf = &req->rq_private_buf;
|
|
|
|
if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
|
|
/*
|
|
* Save the RPC direction in the XDR buffer
|
|
*/
|
|
memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
|
|
&transport->tcp_calldir,
|
|
sizeof(transport->tcp_calldir));
|
|
transport->tcp_copied += sizeof(transport->tcp_calldir);
|
|
transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
|
|
}
|
|
|
|
len = desc->count;
|
|
if (len > transport->tcp_reclen - transport->tcp_offset) {
|
|
struct xdr_skb_reader my_desc;
|
|
|
|
len = transport->tcp_reclen - transport->tcp_offset;
|
|
memcpy(&my_desc, desc, sizeof(my_desc));
|
|
my_desc.count = len;
|
|
r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
|
|
&my_desc, xdr_skb_read_bits);
|
|
desc->count -= r;
|
|
desc->offset += r;
|
|
} else
|
|
r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
|
|
desc, xdr_skb_read_bits);
|
|
|
|
if (r > 0) {
|
|
transport->tcp_copied += r;
|
|
transport->tcp_offset += r;
|
|
}
|
|
if (r != len) {
|
|
/* Error when copying to the receive buffer,
|
|
* usually because we weren't able to allocate
|
|
* additional buffer pages. All we can do now
|
|
* is turn off TCP_RCV_COPY_DATA, so the request
|
|
* will not receive any additional updates,
|
|
* and time out.
|
|
* Any remaining data from this record will
|
|
* be discarded.
|
|
*/
|
|
transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
|
|
dprintk("RPC: XID %08x truncated request\n",
|
|
ntohl(transport->tcp_xid));
|
|
dprintk("RPC: xprt = %p, tcp_copied = %lu, "
|
|
"tcp_offset = %u, tcp_reclen = %u\n",
|
|
xprt, transport->tcp_copied,
|
|
transport->tcp_offset, transport->tcp_reclen);
|
|
return;
|
|
}
|
|
|
|
dprintk("RPC: XID %08x read %zd bytes\n",
|
|
ntohl(transport->tcp_xid), r);
|
|
dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
|
|
"tcp_reclen = %u\n", xprt, transport->tcp_copied,
|
|
transport->tcp_offset, transport->tcp_reclen);
|
|
|
|
if (transport->tcp_copied == req->rq_private_buf.buflen)
|
|
transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
|
|
else if (transport->tcp_offset == transport->tcp_reclen) {
|
|
if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
|
|
transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Finds the request corresponding to the RPC xid and invokes the common
|
|
* tcp read code to read the data.
|
|
*/
|
|
static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
|
|
struct xdr_skb_reader *desc)
|
|
{
|
|
struct sock_xprt *transport =
|
|
container_of(xprt, struct sock_xprt, xprt);
|
|
struct rpc_rqst *req;
|
|
|
|
dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
|
|
|
|
/* Find and lock the request corresponding to this xid */
|
|
spin_lock_bh(&xprt->transport_lock);
|
|
req = xprt_lookup_rqst(xprt, transport->tcp_xid);
|
|
if (!req) {
|
|
dprintk("RPC: XID %08x request not found!\n",
|
|
ntohl(transport->tcp_xid));
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
return -1;
|
|
}
|
|
|
|
xs_tcp_read_common(xprt, desc, req);
|
|
|
|
if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
|
|
xprt_complete_rqst(req->rq_task, transport->tcp_copied);
|
|
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
return 0;
|
|
}
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
/*
|
|
* Obtains an rpc_rqst previously allocated and invokes the common
|
|
* tcp read code to read the data. The result is placed in the callback
|
|
* queue.
|
|
* If we're unable to obtain the rpc_rqst we schedule the closing of the
|
|
* connection and return -1.
|
|
*/
|
|
static int xs_tcp_read_callback(struct rpc_xprt *xprt,
|
|
struct xdr_skb_reader *desc)
|
|
{
|
|
struct sock_xprt *transport =
|
|
container_of(xprt, struct sock_xprt, xprt);
|
|
struct rpc_rqst *req;
|
|
|
|
/* Look up and lock the request corresponding to the given XID */
|
|
spin_lock_bh(&xprt->transport_lock);
|
|
req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
|
|
if (req == NULL) {
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
printk(KERN_WARNING "Callback slot table overflowed\n");
|
|
xprt_force_disconnect(xprt);
|
|
return -1;
|
|
}
|
|
|
|
dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
|
|
xs_tcp_read_common(xprt, desc, req);
|
|
|
|
if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
|
|
xprt_complete_bc_request(req, transport->tcp_copied);
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
|
|
struct xdr_skb_reader *desc)
|
|
{
|
|
struct sock_xprt *transport =
|
|
container_of(xprt, struct sock_xprt, xprt);
|
|
|
|
return (transport->tcp_flags & TCP_RPC_REPLY) ?
|
|
xs_tcp_read_reply(xprt, desc) :
|
|
xs_tcp_read_callback(xprt, desc);
|
|
}
|
|
|
|
static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
|
|
{
|
|
int ret;
|
|
|
|
ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
|
|
SVC_SOCK_ANONYMOUS);
|
|
if (ret < 0)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
|
|
{
|
|
return PAGE_SIZE;
|
|
}
|
|
#else
|
|
static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
|
|
struct xdr_skb_reader *desc)
|
|
{
|
|
return xs_tcp_read_reply(xprt, desc);
|
|
}
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
|
|
/*
|
|
* Read data off the transport. This can be either an RPC_CALL or an
|
|
* RPC_REPLY. Relay the processing to helper functions.
|
|
*/
|
|
static void xs_tcp_read_data(struct rpc_xprt *xprt,
|
|
struct xdr_skb_reader *desc)
|
|
{
|
|
struct sock_xprt *transport =
|
|
container_of(xprt, struct sock_xprt, xprt);
|
|
|
|
if (_xs_tcp_read_data(xprt, desc) == 0)
|
|
xs_tcp_check_fraghdr(transport);
|
|
else {
|
|
/*
|
|
* The transport_lock protects the request handling.
|
|
* There's no need to hold it to update the tcp_flags.
|
|
*/
|
|
transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
|
|
}
|
|
}
|
|
|
|
static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
|
|
{
|
|
size_t len;
|
|
|
|
len = transport->tcp_reclen - transport->tcp_offset;
|
|
if (len > desc->count)
|
|
len = desc->count;
|
|
desc->count -= len;
|
|
desc->offset += len;
|
|
transport->tcp_offset += len;
|
|
dprintk("RPC: discarded %zu bytes\n", len);
|
|
xs_tcp_check_fraghdr(transport);
|
|
}
|
|
|
|
static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
|
|
{
|
|
struct rpc_xprt *xprt = rd_desc->arg.data;
|
|
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
|
|
struct xdr_skb_reader desc = {
|
|
.skb = skb,
|
|
.offset = offset,
|
|
.count = len,
|
|
};
|
|
|
|
dprintk("RPC: xs_tcp_data_recv started\n");
|
|
do {
|
|
trace_xs_tcp_data_recv(transport);
|
|
/* Read in a new fragment marker if necessary */
|
|
/* Can we ever really expect to get completely empty fragments? */
|
|
if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
|
|
xs_tcp_read_fraghdr(xprt, &desc);
|
|
continue;
|
|
}
|
|
/* Read in the xid if necessary */
|
|
if (transport->tcp_flags & TCP_RCV_COPY_XID) {
|
|
xs_tcp_read_xid(transport, &desc);
|
|
continue;
|
|
}
|
|
/* Read in the call/reply flag */
|
|
if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
|
|
xs_tcp_read_calldir(transport, &desc);
|
|
continue;
|
|
}
|
|
/* Read in the request data */
|
|
if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
|
|
xs_tcp_read_data(xprt, &desc);
|
|
continue;
|
|
}
|
|
/* Skip over any trailing bytes on short reads */
|
|
xs_tcp_read_discard(transport, &desc);
|
|
} while (desc.count);
|
|
trace_xs_tcp_data_recv(transport);
|
|
dprintk("RPC: xs_tcp_data_recv done\n");
|
|
return len - desc.count;
|
|
}
|
|
|
|
static void xs_tcp_data_receive(struct sock_xprt *transport)
|
|
{
|
|
struct rpc_xprt *xprt = &transport->xprt;
|
|
struct sock *sk;
|
|
read_descriptor_t rd_desc = {
|
|
.count = 2*1024*1024,
|
|
.arg.data = xprt,
|
|
};
|
|
unsigned long total = 0;
|
|
int read = 0;
|
|
|
|
mutex_lock(&transport->recv_mutex);
|
|
sk = transport->inet;
|
|
if (sk == NULL)
|
|
goto out;
|
|
|
|
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
|
|
for (;;) {
|
|
lock_sock(sk);
|
|
read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
|
|
if (read <= 0) {
|
|
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
|
|
release_sock(sk);
|
|
if (!test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
|
|
break;
|
|
} else {
|
|
release_sock(sk);
|
|
total += read;
|
|
}
|
|
rd_desc.count = 65536;
|
|
}
|
|
out:
|
|
mutex_unlock(&transport->recv_mutex);
|
|
trace_xs_tcp_data_ready(xprt, read, total);
|
|
}
|
|
|
|
static void xs_tcp_data_receive_workfn(struct work_struct *work)
|
|
{
|
|
struct sock_xprt *transport =
|
|
container_of(work, struct sock_xprt, recv_worker);
|
|
xs_tcp_data_receive(transport);
|
|
}
|
|
|
|
/**
|
|
* 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)) {
|
|
|
|
/* Reset TCP record info */
|
|
transport->tcp_offset = 0;
|
|
transport->tcp_reclen = 0;
|
|
transport->tcp_copied = 0;
|
|
transport->tcp_flags =
|
|
TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
|
|
xprt->connect_cookie++;
|
|
clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
|
|
xprt_clear_connecting(xprt);
|
|
|
|
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);
|
|
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);
|
|
xs_sock_mark_closed(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;
|
|
|
|
xprt_write_space(xprt);
|
|
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
|
|
* @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 unsigned short xs_get_random_port(void)
|
|
{
|
|
unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
|
|
unsigned short rand = (unsigned short) prandom_u32() % range;
|
|
return rand + xprt_min_resvport;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
int buflen;
|
|
unsigned short port = 0;
|
|
|
|
if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 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 unsigned short xs_get_srcport(struct sock_xprt *transport)
|
|
{
|
|
unsigned short 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;
|
|
unsigned short 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 0;
|
|
|
|
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 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;
|
|
}
|
|
|
|
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;
|
|
sk->sk_allocation = GFP_NOIO;
|
|
|
|
xprt_clear_connected(xprt);
|
|
|
|
/* Reset to new socket */
|
|
transport->sock = sock;
|
|
transport->inet = sk;
|
|
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/* Tell the socket layer to start connecting... */
|
|
xprt->stat.connect_count++;
|
|
xprt->stat.connect_start = jiffies;
|
|
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 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);
|
|
|
|
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_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.
|
|
*/
|
|
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);
|
|
sk->sk_allocation = GFP_NOIO;
|
|
|
|
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 = transport->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_unlock_connect(xprt, transport);
|
|
xprt_clear_connecting(xprt);
|
|
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;
|
|
|
|
if (sock == NULL)
|
|
return;
|
|
if (xprt_connected(xprt)) {
|
|
kernel_sock_shutdown(sock, SHUT_RDWR);
|
|
trace_rpc_socket_shutdown(xprt, sock);
|
|
} else
|
|
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;
|
|
sk->sk_allocation = GFP_NOIO;
|
|
|
|
/* 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);
|
|
|
|
/* Tell the socket layer to start connecting... */
|
|
xprt->stat.connect_count++;
|
|
xprt->stat.connect_start = jiffies;
|
|
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);
|
|
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
|
|
*
|
|
* 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);
|
|
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 -ENETUNREACH:
|
|
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_unlock_connect(xprt, transport);
|
|
xprt_clear_connecting(xprt);
|
|
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,
|
|
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,
|
|
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 rpc_xprt *xprt = req->rq_xprt;
|
|
struct sock_xprt *transport =
|
|
container_of(xprt, struct sock_xprt, xprt);
|
|
struct socket *sock = transport->sock;
|
|
unsigned long headoff;
|
|
unsigned long tailoff;
|
|
|
|
xs_encode_stream_record_marker(xbufp);
|
|
|
|
tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
|
|
headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
|
|
len = svc_send_common(sock, xbufp,
|
|
virt_to_page(xbufp->head[0].iov_base), headoff,
|
|
xbufp->tail[0].iov_base, tailoff);
|
|
|
|
if (len != xbufp->len) {
|
|
printk(KERN_NOTICE "Error sending entire callback!\n");
|
|
len = -EAGAIN;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* The send routine. Borrows from svc_send
|
|
*/
|
|
static int bc_send_request(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
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
|
|
*/
|
|
if (!mutex_trylock(&xprt->xpt_mutex)) {
|
|
rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
|
|
if (!mutex_trylock(&xprt->xpt_mutex))
|
|
return -EAGAIN;
|
|
rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
|
|
}
|
|
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 struct rpc_xprt_ops xs_local_ops = {
|
|
.reserve_xprt = xprt_reserve_xprt,
|
|
.release_xprt = xs_tcp_release_xprt,
|
|
.alloc_slot = xprt_alloc_slot,
|
|
.rpcbind = xs_local_rpcbind,
|
|
.set_port = xs_local_set_port,
|
|
.connect = xs_local_connect,
|
|
.buf_alloc = rpc_malloc,
|
|
.buf_free = rpc_free,
|
|
.send_request = xs_local_send_request,
|
|
.set_retrans_timeout = xprt_set_retrans_timeout_def,
|
|
.close = xs_close,
|
|
.destroy = xs_destroy,
|
|
.print_stats = xs_local_print_stats,
|
|
.enable_swap = xs_enable_swap,
|
|
.disable_swap = xs_disable_swap,
|
|
};
|
|
|
|
static 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,
|
|
.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,
|
|
.set_retrans_timeout = xprt_set_retrans_timeout_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 struct rpc_xprt_ops xs_tcp_ops = {
|
|
.reserve_xprt = xprt_reserve_xprt,
|
|
.release_xprt = xs_tcp_release_xprt,
|
|
.alloc_slot = xprt_lock_and_alloc_slot,
|
|
.rpcbind = rpcb_getport_async,
|
|
.set_port = xs_set_port,
|
|
.connect = xs_connect,
|
|
.buf_alloc = rpc_malloc,
|
|
.buf_free = rpc_free,
|
|
.send_request = xs_tcp_send_request,
|
|
.set_retrans_timeout = xprt_set_retrans_timeout_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_up = xs_tcp_bc_up,
|
|
.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 struct rpc_xprt_ops bc_tcp_ops = {
|
|
.reserve_xprt = xprt_reserve_xprt,
|
|
.release_xprt = xprt_release_xprt,
|
|
.alloc_slot = xprt_alloc_slot,
|
|
.buf_alloc = bc_malloc,
|
|
.buf_free = bc_free,
|
|
.send_request = bc_send_request,
|
|
.set_retrans_timeout = xprt_set_retrans_timeout_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->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
|
|
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_local_data_receive_workfn);
|
|
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);
|
|
ret = ERR_PTR(xs_local_setup_socket(transport));
|
|
if (ret)
|
|
goto out_err;
|
|
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;
|
|
xprt->tsh_size = 0;
|
|
/* 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_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->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
|
|
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_tcp_data_receive_workfn);
|
|
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->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
|
|
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,
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
/**
|
|
* init_socket_xprt - set up xprtsock's sysctls, register with RPC client
|
|
*
|
|
*/
|
|
int init_socket_xprt(void)
|
|
{
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
if (!sunrpc_table_header)
|
|
sunrpc_table_header = register_sysctl_table(sunrpc_table);
|
|
#endif
|
|
|
|
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 IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
if (sunrpc_table_header) {
|
|
unregister_sysctl_table(sunrpc_table_header);
|
|
sunrpc_table_header = NULL;
|
|
}
|
|
#endif
|
|
|
|
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)
|
|
{
|
|
if (kp->arg == &xprt_min_resvport)
|
|
return param_set_uint_minmax(val, kp,
|
|
RPC_MIN_RESVPORT,
|
|
xprt_max_resvport);
|
|
return param_set_uint_minmax(val, kp,
|
|
xprt_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);
|
|
|
|
|