| /* |
| * 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/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 "sunrpc.h" |
| |
| static void xs_close(struct rpc_xprt *xprt); |
| |
| /* |
| * xprtsock tunables |
| */ |
| static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
| static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; |
| static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; |
| |
| static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; |
| static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; |
| |
| #define XS_TCP_LINGER_TO (15U * HZ) |
| static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
| |
| /* |
| * We can register our own files under /proc/sys/sunrpc by |
| * calling register_sysctl_table() again. The files in that |
| * directory become the union of all files registered there. |
| * |
| * We simply need to make sure that we don't collide with |
| * someone else's file names! |
| */ |
| |
| #ifdef RPC_DEBUG |
| |
| 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 ctl_table xs_tunables_table[] = { |
| { |
| .procname = "udp_slot_table_entries", |
| .data = &xprt_udp_slot_table_entries, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &min_slot_table_size, |
| .extra2 = &max_slot_table_size |
| }, |
| { |
| .procname = "tcp_slot_table_entries", |
| .data = &xprt_tcp_slot_table_entries, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &min_slot_table_size, |
| .extra2 = &max_slot_table_size |
| }, |
| { |
| .procname = "tcp_max_slot_table_entries", |
| .data = &xprt_max_tcp_slot_table_entries, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &min_slot_table_size, |
| .extra2 = &max_tcp_slot_table_limit |
| }, |
| { |
| .procname = "min_resvport", |
| .data = &xprt_min_resvport, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &xprt_min_resvport_limit, |
| .extra2 = &xprt_max_resvport_limit |
| }, |
| { |
| .procname = "max_resvport", |
| .data = &xprt_max_resvport, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &xprt_min_resvport_limit, |
| .extra2 = &xprt_max_resvport_limit |
| }, |
| { |
| .procname = "tcp_fin_timeout", |
| .data = &xs_tcp_fin_timeout, |
| .maxlen = sizeof(xs_tcp_fin_timeout), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { }, |
| }; |
| |
| static 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) |
| #define XS_TCP_MAX_REEST_TO (5U * 60 * 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) |
| |
| #ifdef RPC_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 |
| |
| struct sock_xprt { |
| struct rpc_xprt xprt; |
| |
| /* |
| * Network layer |
| */ |
| struct socket * sock; |
| struct sock * inet; |
| |
| /* |
| * State of TCP reply receive |
| */ |
| __be32 tcp_fraghdr, |
| tcp_xid, |
| tcp_calldir; |
| |
| u32 tcp_offset, |
| tcp_reclen; |
| |
| unsigned long tcp_copied, |
| tcp_flags; |
| |
| /* |
| * Connection of transports |
| */ |
| struct delayed_work connect_worker; |
| struct sockaddr_storage srcaddr; |
| unsigned short srcport; |
| |
| /* |
| * UDP socket buffer size parameters |
| */ |
| size_t rcvsize, |
| sndsize; |
| |
| /* |
| * Saved socket callback addresses |
| */ |
| void (*old_data_ready)(struct sock *, int); |
| void (*old_state_change)(struct sock *); |
| void (*old_write_space)(struct sock *); |
| void (*old_error_report)(struct sock *); |
| }; |
| |
| /* |
| * TCP receive state flags |
| */ |
| #define TCP_RCV_LAST_FRAG (1UL << 0) |
| #define TCP_RCV_COPY_FRAGHDR (1UL << 1) |
| #define TCP_RCV_COPY_XID (1UL << 2) |
| #define TCP_RCV_COPY_DATA (1UL << 3) |
| #define TCP_RCV_READ_CALLDIR (1UL << 4) |
| #define TCP_RCV_COPY_CALLDIR (1UL << 5) |
| |
| /* |
| * TCP RPC flags |
| */ |
| #define TCP_RPC_REPLY (1UL << 6) |
| |
| 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) |
| { |
| struct page **ppage; |
| unsigned int remainder; |
| int err, sent = 0; |
| |
| remainder = xdr->page_len - base; |
| base += xdr->page_base; |
| ppage = xdr->pages + (base >> PAGE_SHIFT); |
| base &= ~PAGE_MASK; |
| for(;;) { |
| unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); |
| int flags = XS_SENDMSG_FLAGS; |
| |
| remainder -= len; |
| if (remainder != 0 || more) |
| flags |= MSG_MORE; |
| err = sock->ops->sendpage(sock, *ppage, base, len, flags); |
| if (remainder == 0 || err != len) |
| break; |
| sent += err; |
| ppage++; |
| base = 0; |
| } |
| if (sent == 0) |
| return err; |
| if (err > 0) |
| sent += err; |
| return sent; |
| } |
| |
| /** |
| * 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 |
| * |
| */ |
| static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
| { |
| unsigned int remainder = xdr->len - base; |
| int err, sent = 0; |
| |
| if (unlikely(!sock)) |
| return -ENOTSOCK; |
| |
| clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); |
| 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 += 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); |
| if (remainder == 0 || err != len) |
| goto out; |
| sent += err; |
| base = 0; |
| } else |
| base -= xdr->page_len; |
| |
| if (base >= xdr->tail[0].iov_len) |
| return sent; |
| err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); |
| out: |
| if (sent == 0) |
| return err; |
| if (err > 0) |
| sent += err; |
| return sent; |
| } |
| |
| 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--; |
| clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
| } |
| |
| /** |
| * 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); |
| 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)) { |
| if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { |
| /* |
| * Notify TCP that we're limited by the application |
| * window size |
| */ |
| set_bit(SOCK_NOSPACE, &transport->sock->flags); |
| transport->inet->sk_write_pending++; |
| /* ...and wait for more buffer space */ |
| xprt_wait_for_buffer_space(task, xs_nospace_callback); |
| } |
| } else { |
| clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
| ret = -ENOTCONN; |
| } |
| |
| spin_unlock_bh(&xprt->transport_lock); |
| 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; |
| |
| 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); |
| dprintk("RPC: %s(%u) = %d\n", |
| __func__, xdr->len - req->rq_bytes_sent, status); |
| if (likely(status >= 0)) { |
| req->rq_bytes_sent += status; |
| req->rq_xmit_bytes_sent += status; |
| if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
| req->rq_bytes_sent = 0; |
| return 0; |
| } |
| status = -EAGAIN; |
| } |
| |
| switch (status) { |
| 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 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); |
| |
| dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
| xdr->len - req->rq_bytes_sent, status); |
| |
| if (status >= 0) { |
| req->rq_xmit_bytes_sent += status; |
| if (status >= req->rq_slen) |
| return 0; |
| /* Still some bytes left; set up for a retry later. */ |
| status = -EAGAIN; |
| } |
| |
| switch (status) { |
| case -ENOTSOCK: |
| status = -ENOTCONN; |
| /* Should we call xs_close() here? */ |
| break; |
| case -EAGAIN: |
| status = xs_nospace(task); |
| break; |
| default: |
| dprintk("RPC: sendmsg returned unrecognized error %d\n", |
| -status); |
| case -ENETUNREACH: |
| case -EPIPE: |
| case -ECONNREFUSED: |
| /* When the server has died, an ICMP port unreachable message |
| * prompts ECONNREFUSED. */ |
| clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
| } |
| |
| return 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_WR); |
| */ |
| 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) |
| kernel_sock_shutdown(sock, SHUT_WR); |
| } |
| |
| /** |
| * 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; |
| int status; |
| |
| xs_encode_stream_record_marker(&req->rq_snd_buf); |
| |
| xs_pktdump("packet data:", |
| req->rq_svec->iov_base, |
| req->rq_svec->iov_len); |
| |
| /* Continue transmitting the packet/record. We must be careful |
| * to cope with writespace callbacks arriving _after_ we have |
| * called sendmsg(). */ |
| while (1) { |
| status = xs_sendpages(transport->sock, |
| NULL, 0, xdr, req->rq_bytes_sent); |
| |
| dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
| xdr->len - req->rq_bytes_sent, status); |
| |
| if (unlikely(status < 0)) |
| break; |
| |
| /* If we've sent the entire packet, immediately |
| * reset the count of bytes sent. */ |
| req->rq_bytes_sent += status; |
| req->rq_xmit_bytes_sent += status; |
| if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
| req->rq_bytes_sent = 0; |
| return 0; |
| } |
| |
| if (status != 0) |
| continue; |
| status = -EAGAIN; |
| break; |
| } |
| |
| switch (status) { |
| case -ENOTSOCK: |
| status = -ENOTCONN; |
| /* Should we call xs_close() here? */ |
| break; |
| case -EAGAIN: |
| status = xs_nospace(task); |
| break; |
| default: |
| dprintk("RPC: sendmsg returned unrecognized error %d\n", |
| -status); |
| case -ECONNRESET: |
| case -EPIPE: |
| xs_tcp_shutdown(xprt); |
| case -ECONNREFUSED: |
| case -ENOTCONN: |
| clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); |
| } |
| |
| 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, &task->tk_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_reset_transport(struct sock_xprt *transport) |
| { |
| struct socket *sock = transport->sock; |
| struct sock *sk = transport->inet; |
| |
| if (sk == NULL) |
| return; |
| |
| transport->srcport = 0; |
| |
| write_lock_bh(&sk->sk_callback_lock); |
| transport->inet = NULL; |
| transport->sock = NULL; |
| |
| sk->sk_user_data = NULL; |
| |
| xs_restore_old_callbacks(transport, sk); |
| write_unlock_bh(&sk->sk_callback_lock); |
| |
| sk->sk_no_check = 0; |
| |
| 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; |
| |
| smp_mb__before_clear_bit(); |
| clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
| clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| clear_bit(XPRT_CLOSING, &xprt->state); |
| smp_mb__after_clear_bit(); |
| xprt_disconnect_done(xprt); |
| } |
| |
| static void xs_tcp_close(struct rpc_xprt *xprt) |
| { |
| if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) |
| xs_close(xprt); |
| else |
| xs_tcp_shutdown(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); |
| xs_free_peer_addresses(xprt); |
| xprt_free(xprt); |
| module_put(THIS_MODULE); |
| } |
| |
| static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
| { |
| return (struct rpc_xprt *) sk->sk_user_data; |
| } |
| |
| 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_ready - "data ready" callback for AF_LOCAL sockets |
| * @sk: socket with data to read |
| * @len: how much data to read |
| * |
| * Currently this assumes we can read the whole reply in a single gulp. |
| */ |
| static void xs_local_data_ready(struct sock *sk, int len) |
| { |
| struct rpc_task *task; |
| struct rpc_xprt *xprt; |
| struct rpc_rqst *rovr; |
| struct sk_buff *skb; |
| int err, repsize, copied; |
| u32 _xid; |
| __be32 *xp; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| dprintk("RPC: %s...\n", __func__); |
| xprt = xprt_from_sock(sk); |
| if (xprt == NULL) |
| goto out; |
| |
| skb = skb_recv_datagram(sk, 0, 1, &err); |
| if (skb == NULL) |
| goto out; |
| |
| if (xprt->shutdown) |
| goto dropit; |
| |
| repsize = skb->len - sizeof(rpc_fraghdr); |
| if (repsize < 4) { |
| dprintk("RPC: impossible RPC reply size %d\n", repsize); |
| goto dropit; |
| } |
| |
| /* Copy the XID from the skb... */ |
| xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); |
| if (xp == NULL) |
| goto dropit; |
| |
| /* Look up and lock the request corresponding to the given XID */ |
| spin_lock(&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(&xprt->transport_lock); |
| dropit: |
| skb_free_datagram(sk, skb); |
| out: |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| /** |
| * xs_udp_data_ready - "data ready" callback for UDP sockets |
| * @sk: socket with data to read |
| * @len: how much data to read |
| * |
| */ |
| static void xs_udp_data_ready(struct sock *sk, int len) |
| { |
| struct rpc_task *task; |
| struct rpc_xprt *xprt; |
| struct rpc_rqst *rovr; |
| struct sk_buff *skb; |
| int err, repsize, copied; |
| u32 _xid; |
| __be32 *xp; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| dprintk("RPC: xs_udp_data_ready...\n"); |
| if (!(xprt = xprt_from_sock(sk))) |
| goto out; |
| |
| if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) |
| goto out; |
| |
| if (xprt->shutdown) |
| goto dropit; |
| |
| repsize = skb->len - sizeof(struct udphdr); |
| if (repsize < 4) { |
| dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
| goto dropit; |
| } |
| |
| /* Copy the XID from the skb... */ |
| xp = skb_header_pointer(skb, sizeof(struct udphdr), |
| sizeof(_xid), &_xid); |
| if (xp == NULL) |
| goto dropit; |
| |
| /* Look up and lock the request corresponding to the given XID */ |
| spin_lock(&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_BH(sk, UDP_MIB_INERRORS); |
| goto out_unlock; |
| } |
| |
| UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); |
| |
| xprt_adjust_cwnd(task, copied); |
| xprt_complete_rqst(task, copied); |
| |
| out_unlock: |
| spin_unlock(&xprt->transport_lock); |
| dropit: |
| skb_free_datagram(sk, skb); |
| out: |
| 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) |
| { |
| set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
| 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(&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(&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(&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 inline 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; |
| |
| req = xprt_alloc_bc_request(xprt); |
| if (req == NULL) { |
| printk(KERN_WARNING "Callback slot table overflowed\n"); |
| xprt_force_disconnect(xprt); |
| return -1; |
| } |
| |
| req->rq_xid = transport->tcp_xid; |
| 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)) { |
| struct svc_serv *bc_serv = xprt->bc_serv; |
| |
| /* |
| * Add callback request to callback list. The callback |
| * service sleeps on the sv_cb_waitq waiting for new |
| * requests. Wake it up after adding enqueing the |
| * request. |
| */ |
| dprintk("RPC: add callback request to list\n"); |
| spin_lock(&bc_serv->sv_cb_lock); |
| list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); |
| spin_unlock(&bc_serv->sv_cb_lock); |
| wake_up(&bc_serv->sv_cb_waitq); |
| } |
| |
| req->rq_private_buf.len = transport->tcp_copied; |
| |
| 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); |
| } |
| #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 { |
| /* 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); |
| dprintk("RPC: xs_tcp_data_recv done\n"); |
| return len - desc.count; |
| } |
| |
| /** |
| * xs_tcp_data_ready - "data ready" callback for TCP sockets |
| * @sk: socket with data to read |
| * @bytes: how much data to read |
| * |
| */ |
| static void xs_tcp_data_ready(struct sock *sk, int bytes) |
| { |
| struct rpc_xprt *xprt; |
| read_descriptor_t rd_desc; |
| int read; |
| |
| dprintk("RPC: xs_tcp_data_ready...\n"); |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| if (!(xprt = xprt_from_sock(sk))) |
| goto out; |
| if (xprt->shutdown) |
| goto out; |
| |
| /* Any data means we had a useful conversation, so |
| * the we don't need to delay the next reconnect |
| */ |
| if (xprt->reestablish_timeout) |
| xprt->reestablish_timeout = 0; |
| |
| /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
| rd_desc.arg.data = xprt; |
| do { |
| rd_desc.count = 65536; |
| read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
| } while (read > 0); |
| out: |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| /* |
| * Do the equivalent of linger/linger2 handling for dealing with |
| * broken servers that don't close the socket in a timely |
| * fashion |
| */ |
| static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, |
| unsigned long timeout) |
| { |
| struct sock_xprt *transport; |
| |
| if (xprt_test_and_set_connecting(xprt)) |
| return; |
| set_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
| transport = container_of(xprt, struct sock_xprt, xprt); |
| queue_delayed_work(rpciod_workqueue, &transport->connect_worker, |
| timeout); |
| } |
| |
| static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *transport; |
| |
| transport = container_of(xprt, struct sock_xprt, xprt); |
| |
| if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || |
| !cancel_delayed_work(&transport->connect_worker)) |
| return; |
| clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
| xprt_clear_connecting(xprt); |
| } |
| |
| static void xs_sock_mark_closed(struct rpc_xprt *xprt) |
| { |
| smp_mb__before_clear_bit(); |
| clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
| clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
| clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| clear_bit(XPRT_CLOSING, &xprt->state); |
| smp_mb__after_clear_bit(); |
| /* Mark transport as closed and wake up all pending tasks */ |
| xprt_disconnect_done(xprt); |
| } |
| |
| /** |
| * 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; |
| |
| 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); |
| |
| switch (sk->sk_state) { |
| case TCP_ESTABLISHED: |
| spin_lock(&xprt->transport_lock); |
| if (!xprt_test_and_set_connected(xprt)) { |
| struct sock_xprt *transport = container_of(xprt, |
| struct sock_xprt, 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_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_clear_bit(); |
| clear_bit(XPRT_CONNECTED, &xprt->state); |
| clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| smp_mb__after_clear_bit(); |
| xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
| break; |
| case TCP_CLOSE_WAIT: |
| /* The server initiated a shutdown of the socket */ |
| xprt->connect_cookie++; |
| 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); |
| xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); |
| smp_mb__before_clear_bit(); |
| clear_bit(XPRT_CONNECTED, &xprt->state); |
| smp_mb__after_clear_bit(); |
| break; |
| case TCP_CLOSE: |
| xs_tcp_cancel_linger_timeout(xprt); |
| xs_sock_mark_closed(xprt); |
| } |
| out: |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| /** |
| * xs_error_report - callback mainly for catching socket errors |
| * @sk: socket |
| */ |
| static void xs_error_report(struct sock *sk) |
| { |
| struct rpc_xprt *xprt; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| if (!(xprt = xprt_from_sock(sk))) |
| goto out; |
| dprintk("RPC: %s client %p...\n" |
| "RPC: error %d\n", |
| __func__, xprt, sk->sk_err); |
| xprt_wake_pending_tasks(xprt, -EAGAIN); |
| out: |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static void xs_write_space(struct sock *sk) |
| { |
| struct socket *sock; |
| struct rpc_xprt *xprt; |
| |
| if (unlikely(!(sock = sk->sk_socket))) |
| return; |
| clear_bit(SOCK_NOSPACE, &sock->flags); |
| |
| if (unlikely(!(xprt = xprt_from_sock(sk)))) |
| return; |
| if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) |
| return; |
| |
| xprt_write_space(xprt); |
| } |
| |
| /** |
| * 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_wspace(sk) >= sk_stream_min_wspace(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_task *task) |
| { |
| xprt_adjust_cwnd(task, -ETIMEDOUT); |
| } |
| |
| static unsigned short xs_get_random_port(void) |
| { |
| unsigned short range = xprt_max_resvport - xprt_min_resvport; |
| unsigned short rand = (unsigned short) net_random() % range; |
| return rand + xprt_min_resvport; |
| } |
| |
| /** |
| * 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 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; |
| |
| 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 (port == 0) |
| break; |
| 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; |
| |
| BUG_ON(sock_owned_by_user(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; |
| |
| BUG_ON(sock_owned_by_user(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; |
| |
| BUG_ON(sock_owned_by_user(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) |
| { |
| 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_socketu(struct socket *sock) |
| { |
| } |
| |
| static inline void xs_reclassify_socket4(struct socket *sock) |
| { |
| } |
| |
| static inline void xs_reclassify_socket6(struct socket *sock) |
| { |
| } |
| |
| static inline void xs_reclassify_socket(int family, struct socket *sock) |
| { |
| } |
| #endif |
| |
| static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
| struct sock_xprt *transport, int family, int type, int protocol) |
| { |
| 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); |
| |
| 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_local_data_ready; |
| sk->sk_write_space = xs_udp_write_space; |
| sk->sk_error_report = xs_error_report; |
| sk->sk_allocation = GFP_ATOMIC; |
| |
| 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 |
| * @xprt: RPC transport to connect |
| * @transport: socket transport to connect |
| * @create_sock: function to create a socket of the correct type |
| * |
| * Invoked by a work queue tasklet. |
| */ |
| static void xs_local_setup_socket(struct work_struct *work) |
| { |
| struct sock_xprt *transport = |
| container_of(work, struct sock_xprt, connect_worker.work); |
| struct rpc_xprt *xprt = &transport->xprt; |
| struct socket *sock; |
| int status = -EIO; |
| |
| if (xprt->shutdown) |
| goto out; |
| |
| current->flags |= PF_FSTRANS; |
| |
| clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
| 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_socketu(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); |
| switch (status) { |
| case 0: |
| dprintk("RPC: xprt %p connected to %s\n", |
| xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
| xprt_set_connected(xprt); |
| break; |
| case -ENOENT: |
| dprintk("RPC: xprt %p: socket %s does not exist\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); |
| current->flags &= ~PF_FSTRANS; |
| } |
| |
| #ifdef CONFIG_SUNRPC_SWAP |
| static void xs_set_memalloc(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, |
| xprt); |
| |
| if (xprt->swapper) |
| sk_set_memalloc(transport->inet); |
| } |
| |
| /** |
| * xs_swapper - Tag this transport as being used for swap. |
| * @xprt: transport to tag |
| * @enable: enable/disable |
| * |
| */ |
| int xs_swapper(struct rpc_xprt *xprt, int enable) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, |
| xprt); |
| int err = 0; |
| |
| if (enable) { |
| xprt->swapper++; |
| xs_set_memalloc(xprt); |
| } else if (xprt->swapper) { |
| xprt->swapper--; |
| sk_clear_memalloc(transport->inet); |
| } |
| |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(xs_swapper); |
| #else |
| static void xs_set_memalloc(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_udp_data_ready; |
| sk->sk_write_space = xs_udp_write_space; |
| sk->sk_error_report = xs_error_report; |
| sk->sk_no_check = UDP_CSUM_NORCV; |
| sk->sk_allocation = GFP_ATOMIC; |
| |
| 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); |
| } |
| |
| 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; |
| |
| if (xprt->shutdown) |
| goto out; |
| |
| current->flags |= PF_FSTRANS; |
| |
| /* Start by resetting any existing state */ |
| xs_reset_transport(transport); |
| sock = xs_create_sock(xprt, transport, |
| xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); |
| 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); |
| status = 0; |
| out: |
| xprt_clear_connecting(xprt); |
| xprt_wake_pending_tasks(xprt, status); |
| current->flags &= ~PF_FSTRANS; |
| } |
| |
| /* |
| * We need to preserve the port number so the reply cache on the server can |
| * find our cached RPC replies when we get around to reconnecting. |
| */ |
| static void xs_abort_connection(struct sock_xprt *transport) |
| { |
| int result; |
| struct sockaddr any; |
| |
| dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); |
| |
| /* |
| * Disconnect the transport socket by doing a connect operation |
| * with AF_UNSPEC. This should return immediately... |
| */ |
| memset(&any, 0, sizeof(any)); |
| any.sa_family = AF_UNSPEC; |
| result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
| if (!result) |
| xs_sock_mark_closed(&transport->xprt); |
| else |
| dprintk("RPC: AF_UNSPEC connect return code %d\n", |
| result); |
| } |
| |
| static void xs_tcp_reuse_connection(struct sock_xprt *transport) |
| { |
| unsigned int state = transport->inet->sk_state; |
| |
| if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { |
| /* we don't need to abort the connection if the socket |
| * hasn't undergone a shutdown |
| */ |
| if (transport->inet->sk_shutdown == 0) |
| return; |
| dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", |
| __func__, transport->inet->sk_shutdown); |
| } |
| if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { |
| /* we don't need to abort the connection if the socket |
| * hasn't undergone a shutdown |
| */ |
| if (transport->inet->sk_shutdown == 0) |
| return; |
| dprintk("RPC: %s: ESTABLISHED/SYN_SENT " |
| "sk_shutdown set to %d\n", |
| __func__, transport->inet->sk_shutdown); |
| } |
| xs_abort_connection(transport); |
| } |
| |
| 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; |
| |
| write_lock_bh(&sk->sk_callback_lock); |
| |
| xs_save_old_callbacks(transport, sk); |
| |
| sk->sk_user_data = xprt; |
| sk->sk_data_ready = xs_tcp_data_ready; |
| sk->sk_state_change = xs_tcp_state_change; |
| sk->sk_write_space = xs_tcp_write_space; |
| sk->sk_error_report = xs_error_report; |
| sk->sk_allocation = GFP_ATOMIC; |
| |
| /* socket options */ |
| sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
| sock_reset_flag(sk, SOCK_LINGER); |
| tcp_sk(sk)->linger2 = 0; |
| 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; |
| ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
| switch (ret) { |
| case 0: |
| case -EINPROGRESS: |
| /* SYN_SENT! */ |
| xprt->connect_cookie++; |
| if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
| xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| } |
| out: |
| return ret; |
| } |
| |
| /** |
| * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
| * @xprt: RPC transport to connect |
| * @transport: socket transport to connect |
| * @create_sock: function to create a socket of the correct type |
| * |
| * Invoked by a work queue tasklet. |
| */ |
| static void xs_tcp_setup_socket(struct work_struct *work) |
| { |
| struct sock_xprt *transport = |
| container_of(work, struct sock_xprt, connect_worker.work); |
| struct socket *sock = transport->sock; |
| struct rpc_xprt *xprt = &transport->xprt; |
| int status = -EIO; |
| |
| if (xprt->shutdown) |
| goto out; |
| |
| current->flags |= PF_FSTRANS; |
| |
| if (!sock) { |
| clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); |
| sock = xs_create_sock(xprt, transport, |
| xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); |
| if (IS_ERR(sock)) { |
| status = PTR_ERR(sock); |
| goto out; |
| } |
| } else { |
| int abort_and_exit; |
| |
| abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, |
| &xprt->state); |
| /* "close" the socket, preserving the local port */ |
| xs_tcp_reuse_connection(transport); |
| |
| if (abort_and_exit) |
| goto out_eagain; |
| } |
| |
| 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); |
| 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 -ECONNREFUSED: |
| case -ECONNRESET: |
| case -ENETUNREACH: |
| /* retry with existing socket, after a delay */ |
| case 0: |
| case -EINPROGRESS: |
| case -EALREADY: |
| xprt_clear_connecting(xprt); |
| current->flags &= ~PF_FSTRANS; |
| return; |
| case -EINVAL: |
| /* Happens, for instance, if the user specified a link |
| * local IPv6 address without a scope-id. |
| */ |
| goto out; |
| } |
| out_eagain: |
| status = -EAGAIN; |
| out: |
| xprt_clear_connecting(xprt); |
| xprt_wake_pending_tasks(xprt, status); |
| current->flags &= ~PF_FSTRANS; |
| } |
| |
| /** |
| * xs_connect - connect a socket to a remote endpoint |
| * @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_task *task) |
| { |
| struct rpc_xprt *xprt = task->tk_xprt; |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| |
| if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { |
| dprintk("RPC: xs_connect delayed xprt %p for %lu " |
| "seconds\n", |
| xprt, xprt->reestablish_timeout / HZ); |
| queue_delayed_work(rpciod_workqueue, |
| &transport->connect_worker, |
| xprt->reestablish_timeout); |
| xprt->reestablish_timeout <<= 1; |
| if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
| xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
| xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; |
| } else { |
| dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
| queue_delayed_work(rpciod_workqueue, |
| &transport->connect_worker, 0); |
| } |
| } |
| |
| /** |
| * 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 void *bc_malloc(struct rpc_task *task, size_t size) |
| { |
| struct page *page; |
| struct rpc_buffer *buf; |
| |
| BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); |
| page = alloc_page(GFP_KERNEL); |
| |
| if (!page) |
| return NULL; |
| |
| buf = page_address(page); |
| buf->len = PAGE_SIZE; |
| |
| return buf->data; |
| } |
| |
| /* |
| * Free the space allocated in the bc_alloc routine |
| */ |
| static void bc_free(void *buffer) |
| { |
| struct rpc_buffer *buf; |
| |
| if (!buffer) |
| return; |
| |
| 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; |
| struct svc_sock *svsk; |
| u32 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; |
| svsk = container_of(xprt, struct svc_sock, sk_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) |
| { |
| } |
| |
| 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_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, |
| }; |
| |
| 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, |
| }; |
| |
| 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_close, |
| .destroy = xs_destroy, |
| .print_stats = xs_tcp_print_stats, |
| }; |
| |
| /* |
| * 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, |
| .rpcbind = xs_local_rpcbind, |
| .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, |
| }; |
| |
| 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); |
| 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; |
| |
| 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); |
| INIT_DELAYED_WORK(&transport->connect_worker, |
| xs_local_setup_socket); |
| xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); |
| break; |
| default: |
| ret = ERR_PTR(-EAFNOSUPPORT); |
| goto out_err; |
| } |
| |
| dprintk("RPC: set up xprt to %s via AF_LOCAL\n", |
| xprt->address_strings[RPC_DISPLAY_ADDR]); |
| |
| if (try_module_get(THIS_MODULE)) |
| return xprt; |
| ret = ERR_PTR(-EINVAL); |
| out_err: |
| 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; |
| |
| switch (addr->sa_family) { |
| case AF_INET: |
| if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
| xprt_set_bound(xprt); |
| |
| INIT_DELAYED_WORK(&transport->connect_worker, |
| xs_udp_setup_socket); |
| 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); |
| |
| INIT_DELAYED_WORK(&transport->connect_worker, |
| xs_udp_setup_socket); |
| 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: |
| 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; |
| |
| 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 = 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; |
| |
| switch (addr->sa_family) { |
| case AF_INET: |
| if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
| xprt_set_bound(xprt); |
| |
| INIT_DELAYED_WORK(&transport->connect_worker, |
| xs_tcp_setup_socket); |
| 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); |
| |
| INIT_DELAYED_WORK(&transport->connect_worker, |
| xs_tcp_setup_socket); |
| 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: |
| 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; |
| |
| if (args->bc_xprt->xpt_bc_xprt) { |
| /* |
| * This server connection already has a backchannel |
| * export; we can't create a new one, as we wouldn't be |
| * able to match replies based on xid any more. So, |
| * reuse the already-existing one: |
| */ |
| return args->bc_xprt->xpt_bc_xprt; |
| } |
| 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 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; |
| xprt_put(xprt); |
| ret = ERR_PTR(-EINVAL); |
| out_err: |
| 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) |
| { |
| #ifdef RPC_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) |
| { |
| #ifdef RPC_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 long num; |
| int ret; |
| |
| if (!val) |
| return -EINVAL; |
| ret = strict_strtoul(val, 0, &num); |
| if (ret == -EINVAL || num < min || num > max) |
| return -EINVAL; |
| *((unsigned int *)kp->arg) = num; |
| return 0; |
| } |
| |
| static int param_set_portnr(const char *val, const struct kernel_param *kp) |
| { |
| return param_set_uint_minmax(val, kp, |
| RPC_MIN_RESVPORT, |
| RPC_MAX_RESVPORT); |
| } |
| |
| static 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 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 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); |
| |