| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * linux/net/sunrpc/xprtsock.c |
| * |
| * Client-side transport implementation for sockets. |
| * |
| * TCP callback races fixes (C) 1998 Red Hat |
| * TCP send fixes (C) 1998 Red Hat |
| * TCP NFS related read + write fixes |
| * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> |
| * |
| * Rewrite of larges part of the code in order to stabilize TCP stuff. |
| * Fix behaviour when socket buffer is full. |
| * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> |
| * |
| * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> |
| * |
| * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. |
| * <gilles.quillard@bull.net> |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/capability.h> |
| #include <linux/pagemap.h> |
| #include <linux/errno.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/net.h> |
| #include <linux/mm.h> |
| #include <linux/un.h> |
| #include <linux/udp.h> |
| #include <linux/tcp.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/addr.h> |
| #include <linux/sunrpc/sched.h> |
| #include <linux/sunrpc/svcsock.h> |
| #include <linux/sunrpc/xprtsock.h> |
| #include <linux/file.h> |
| #ifdef CONFIG_SUNRPC_BACKCHANNEL |
| #include <linux/sunrpc/bc_xprt.h> |
| #endif |
| |
| #include <net/sock.h> |
| #include <net/checksum.h> |
| #include <net/udp.h> |
| #include <net/tcp.h> |
| #include <linux/bvec.h> |
| #include <linux/highmem.h> |
| #include <linux/uio.h> |
| #include <linux/sched/mm.h> |
| |
| #include <trace/events/sunrpc.h> |
| |
| #include "sunrpc.h" |
| |
| static void xs_close(struct rpc_xprt *xprt); |
| static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, |
| struct socket *sock); |
| |
| /* |
| * xprtsock tunables |
| */ |
| static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
| static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; |
| static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; |
| |
| static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; |
| static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; |
| |
| #define XS_TCP_LINGER_TO (15U * HZ) |
| static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; |
| |
| /* |
| * We can register our own files under /proc/sys/sunrpc by |
| * calling register_sysctl_table() again. The files in that |
| * directory become the union of all files registered there. |
| * |
| * We simply need to make sure that we don't collide with |
| * someone else's file names! |
| */ |
| |
| static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; |
| static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; |
| static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; |
| static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; |
| static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; |
| |
| static struct ctl_table_header *sunrpc_table_header; |
| |
| /* |
| * FIXME: changing the UDP slot table size should also resize the UDP |
| * socket buffers for existing UDP transports |
| */ |
| static struct ctl_table xs_tunables_table[] = { |
| { |
| .procname = "udp_slot_table_entries", |
| .data = &xprt_udp_slot_table_entries, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &min_slot_table_size, |
| .extra2 = &max_slot_table_size |
| }, |
| { |
| .procname = "tcp_slot_table_entries", |
| .data = &xprt_tcp_slot_table_entries, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &min_slot_table_size, |
| .extra2 = &max_slot_table_size |
| }, |
| { |
| .procname = "tcp_max_slot_table_entries", |
| .data = &xprt_max_tcp_slot_table_entries, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &min_slot_table_size, |
| .extra2 = &max_tcp_slot_table_limit |
| }, |
| { |
| .procname = "min_resvport", |
| .data = &xprt_min_resvport, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &xprt_min_resvport_limit, |
| .extra2 = &xprt_max_resvport_limit |
| }, |
| { |
| .procname = "max_resvport", |
| .data = &xprt_max_resvport, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &xprt_min_resvport_limit, |
| .extra2 = &xprt_max_resvport_limit |
| }, |
| { |
| .procname = "tcp_fin_timeout", |
| .data = &xs_tcp_fin_timeout, |
| .maxlen = sizeof(xs_tcp_fin_timeout), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { }, |
| }; |
| |
| static struct ctl_table sunrpc_table[] = { |
| { |
| .procname = "sunrpc", |
| .mode = 0555, |
| .child = xs_tunables_table |
| }, |
| { }, |
| }; |
| |
| /* |
| * Wait duration for a reply from the RPC portmapper. |
| */ |
| #define XS_BIND_TO (60U * HZ) |
| |
| /* |
| * Delay if a UDP socket connect error occurs. This is most likely some |
| * kind of resource problem on the local host. |
| */ |
| #define XS_UDP_REEST_TO (2U * HZ) |
| |
| /* |
| * The reestablish timeout allows clients to delay for a bit before attempting |
| * to reconnect to a server that just dropped our connection. |
| * |
| * We implement an exponential backoff when trying to reestablish a TCP |
| * transport connection with the server. Some servers like to drop a TCP |
| * connection when they are overworked, so we start with a short timeout and |
| * increase over time if the server is down or not responding. |
| */ |
| #define XS_TCP_INIT_REEST_TO (3U * HZ) |
| |
| /* |
| * TCP idle timeout; client drops the transport socket if it is idle |
| * for this long. Note that we also timeout UDP sockets to prevent |
| * holding port numbers when there is no RPC traffic. |
| */ |
| #define XS_IDLE_DISC_TO (5U * 60 * HZ) |
| |
| #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
| # undef RPC_DEBUG_DATA |
| # define RPCDBG_FACILITY RPCDBG_TRANS |
| #endif |
| |
| #ifdef RPC_DEBUG_DATA |
| static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
| { |
| u8 *buf = (u8 *) packet; |
| int j; |
| |
| dprintk("RPC: %s\n", msg); |
| for (j = 0; j < count && j < 128; j += 4) { |
| if (!(j & 31)) { |
| if (j) |
| dprintk("\n"); |
| dprintk("0x%04x ", j); |
| } |
| dprintk("%02x%02x%02x%02x ", |
| buf[j], buf[j+1], buf[j+2], buf[j+3]); |
| } |
| dprintk("\n"); |
| } |
| #else |
| static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
| { |
| /* NOP */ |
| } |
| #endif |
| |
| static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
| { |
| return (struct rpc_xprt *) sk->sk_user_data; |
| } |
| |
| static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
| { |
| return (struct sockaddr *) &xprt->addr; |
| } |
| |
| static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) |
| { |
| return (struct sockaddr_un *) &xprt->addr; |
| } |
| |
| static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) |
| { |
| return (struct sockaddr_in *) &xprt->addr; |
| } |
| |
| static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) |
| { |
| return (struct sockaddr_in6 *) &xprt->addr; |
| } |
| |
| static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) |
| { |
| struct sockaddr *sap = xs_addr(xprt); |
| struct sockaddr_in6 *sin6; |
| struct sockaddr_in *sin; |
| struct sockaddr_un *sun; |
| char buf[128]; |
| |
| switch (sap->sa_family) { |
| case AF_LOCAL: |
| sun = xs_addr_un(xprt); |
| strlcpy(buf, sun->sun_path, sizeof(buf)); |
| xprt->address_strings[RPC_DISPLAY_ADDR] = |
| kstrdup(buf, GFP_KERNEL); |
| break; |
| case AF_INET: |
| (void)rpc_ntop(sap, buf, sizeof(buf)); |
| xprt->address_strings[RPC_DISPLAY_ADDR] = |
| kstrdup(buf, GFP_KERNEL); |
| sin = xs_addr_in(xprt); |
| snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
| break; |
| case AF_INET6: |
| (void)rpc_ntop(sap, buf, sizeof(buf)); |
| xprt->address_strings[RPC_DISPLAY_ADDR] = |
| kstrdup(buf, GFP_KERNEL); |
| sin6 = xs_addr_in6(xprt); |
| snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); |
| break; |
| default: |
| BUG(); |
| } |
| |
| xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
| } |
| |
| static void xs_format_common_peer_ports(struct rpc_xprt *xprt) |
| { |
| struct sockaddr *sap = xs_addr(xprt); |
| char buf[128]; |
| |
| snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
| xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
| |
| snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
| xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
| } |
| |
| static void xs_format_peer_addresses(struct rpc_xprt *xprt, |
| const char *protocol, |
| const char *netid) |
| { |
| xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; |
| xprt->address_strings[RPC_DISPLAY_NETID] = netid; |
| xs_format_common_peer_addresses(xprt); |
| xs_format_common_peer_ports(xprt); |
| } |
| |
| static void xs_update_peer_port(struct rpc_xprt *xprt) |
| { |
| kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); |
| kfree(xprt->address_strings[RPC_DISPLAY_PORT]); |
| |
| xs_format_common_peer_ports(xprt); |
| } |
| |
| static void xs_free_peer_addresses(struct rpc_xprt *xprt) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < RPC_DISPLAY_MAX; i++) |
| switch (i) { |
| case RPC_DISPLAY_PROTO: |
| case RPC_DISPLAY_NETID: |
| continue; |
| default: |
| kfree(xprt->address_strings[i]); |
| } |
| } |
| |
| static size_t |
| xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) |
| { |
| size_t i,n; |
| |
| if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES)) |
| return want; |
| n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| for (i = 0; i < n; i++) { |
| if (buf->pages[i]) |
| continue; |
| buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp); |
| if (!buf->pages[i]) { |
| i *= PAGE_SIZE; |
| return i > buf->page_base ? i - buf->page_base : 0; |
| } |
| } |
| return want; |
| } |
| |
| static ssize_t |
| xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) |
| { |
| ssize_t ret; |
| if (seek != 0) |
| iov_iter_advance(&msg->msg_iter, seek); |
| ret = sock_recvmsg(sock, msg, flags); |
| return ret > 0 ? ret + seek : ret; |
| } |
| |
| static ssize_t |
| xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags, |
| struct kvec *kvec, size_t count, size_t seek) |
| { |
| iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count); |
| return xs_sock_recvmsg(sock, msg, flags, seek); |
| } |
| |
| static ssize_t |
| xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags, |
| struct bio_vec *bvec, unsigned long nr, size_t count, |
| size_t seek) |
| { |
| iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count); |
| return xs_sock_recvmsg(sock, msg, flags, seek); |
| } |
| |
| static ssize_t |
| xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, |
| size_t count) |
| { |
| iov_iter_discard(&msg->msg_iter, READ, count); |
| return sock_recvmsg(sock, msg, flags); |
| } |
| |
| #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
| static void |
| xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) |
| { |
| struct bvec_iter bi = { |
| .bi_size = count, |
| }; |
| struct bio_vec bv; |
| |
| bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); |
| for_each_bvec(bv, bvec, bi, bi) |
| flush_dcache_page(bv.bv_page); |
| } |
| #else |
| static inline void |
| xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) |
| { |
| } |
| #endif |
| |
| static ssize_t |
| xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags, |
| struct xdr_buf *buf, size_t count, size_t seek, size_t *read) |
| { |
| size_t want, seek_init = seek, offset = 0; |
| ssize_t ret; |
| |
| want = min_t(size_t, count, buf->head[0].iov_len); |
| if (seek < want) { |
| ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek); |
| if (ret <= 0) |
| goto sock_err; |
| offset += ret; |
| if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) |
| goto out; |
| if (ret != want) |
| goto out; |
| seek = 0; |
| } else { |
| seek -= want; |
| offset += want; |
| } |
| |
| want = xs_alloc_sparse_pages(buf, |
| min_t(size_t, count - offset, buf->page_len), |
| GFP_KERNEL); |
| if (seek < want) { |
| ret = xs_read_bvec(sock, msg, flags, buf->bvec, |
| xdr_buf_pagecount(buf), |
| want + buf->page_base, |
| seek + buf->page_base); |
| if (ret <= 0) |
| goto sock_err; |
| xs_flush_bvec(buf->bvec, ret, seek + buf->page_base); |
| offset += ret - buf->page_base; |
| if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) |
| goto out; |
| if (ret != want) |
| goto out; |
| seek = 0; |
| } else { |
| seek -= want; |
| offset += want; |
| } |
| |
| want = min_t(size_t, count - offset, buf->tail[0].iov_len); |
| if (seek < want) { |
| ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek); |
| if (ret <= 0) |
| goto sock_err; |
| offset += ret; |
| if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) |
| goto out; |
| if (ret != want) |
| goto out; |
| } else if (offset < seek_init) |
| offset = seek_init; |
| ret = -EMSGSIZE; |
| out: |
| *read = offset - seek_init; |
| return ret; |
| sock_err: |
| offset += seek; |
| goto out; |
| } |
| |
| static void |
| xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf) |
| { |
| if (!transport->recv.copied) { |
| if (buf->head[0].iov_len >= transport->recv.offset) |
| memcpy(buf->head[0].iov_base, |
| &transport->recv.xid, |
| transport->recv.offset); |
| transport->recv.copied = transport->recv.offset; |
| } |
| } |
| |
| static bool |
| xs_read_stream_request_done(struct sock_xprt *transport) |
| { |
| return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT); |
| } |
| |
| static void |
| xs_read_stream_check_eor(struct sock_xprt *transport, |
| struct msghdr *msg) |
| { |
| if (xs_read_stream_request_done(transport)) |
| msg->msg_flags |= MSG_EOR; |
| } |
| |
| static ssize_t |
| xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg, |
| int flags, struct rpc_rqst *req) |
| { |
| struct xdr_buf *buf = &req->rq_private_buf; |
| size_t want, uninitialized_var(read); |
| ssize_t uninitialized_var(ret); |
| |
| xs_read_header(transport, buf); |
| |
| want = transport->recv.len - transport->recv.offset; |
| if (want != 0) { |
| ret = xs_read_xdr_buf(transport->sock, msg, flags, buf, |
| transport->recv.copied + want, |
| transport->recv.copied, |
| &read); |
| transport->recv.offset += read; |
| transport->recv.copied += read; |
| } |
| |
| if (transport->recv.offset == transport->recv.len) |
| xs_read_stream_check_eor(transport, msg); |
| |
| if (want == 0) |
| return 0; |
| |
| switch (ret) { |
| default: |
| break; |
| case -EFAULT: |
| case -EMSGSIZE: |
| msg->msg_flags |= MSG_TRUNC; |
| return read; |
| case 0: |
| return -ESHUTDOWN; |
| } |
| return ret < 0 ? ret : read; |
| } |
| |
| static size_t |
| xs_read_stream_headersize(bool isfrag) |
| { |
| if (isfrag) |
| return sizeof(__be32); |
| return 3 * sizeof(__be32); |
| } |
| |
| static ssize_t |
| xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg, |
| int flags, size_t want, size_t seek) |
| { |
| struct kvec kvec = { |
| .iov_base = &transport->recv.fraghdr, |
| .iov_len = want, |
| }; |
| return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek); |
| } |
| |
| #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| static ssize_t |
| xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) |
| { |
| struct rpc_xprt *xprt = &transport->xprt; |
| struct rpc_rqst *req; |
| ssize_t ret; |
| |
| /* Look up and lock the request corresponding to the given XID */ |
| req = xprt_lookup_bc_request(xprt, transport->recv.xid); |
| if (!req) { |
| printk(KERN_WARNING "Callback slot table overflowed\n"); |
| return -ESHUTDOWN; |
| } |
| |
| ret = xs_read_stream_request(transport, msg, flags, req); |
| if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) |
| xprt_complete_bc_request(req, transport->recv.copied); |
| |
| return ret; |
| } |
| #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
| static ssize_t |
| xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) |
| { |
| return -ESHUTDOWN; |
| } |
| #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
| |
| static ssize_t |
| xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags) |
| { |
| struct rpc_xprt *xprt = &transport->xprt; |
| struct rpc_rqst *req; |
| ssize_t ret = 0; |
| |
| /* Look up and lock the request corresponding to the given XID */ |
| spin_lock(&xprt->queue_lock); |
| req = xprt_lookup_rqst(xprt, transport->recv.xid); |
| if (!req) { |
| msg->msg_flags |= MSG_TRUNC; |
| goto out; |
| } |
| xprt_pin_rqst(req); |
| spin_unlock(&xprt->queue_lock); |
| |
| ret = xs_read_stream_request(transport, msg, flags, req); |
| |
| spin_lock(&xprt->queue_lock); |
| if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) |
| xprt_complete_rqst(req->rq_task, transport->recv.copied); |
| xprt_unpin_rqst(req); |
| out: |
| spin_unlock(&xprt->queue_lock); |
| return ret; |
| } |
| |
| static ssize_t |
| xs_read_stream(struct sock_xprt *transport, int flags) |
| { |
| struct msghdr msg = { 0 }; |
| size_t want, read = 0; |
| ssize_t ret = 0; |
| |
| if (transport->recv.len == 0) { |
| want = xs_read_stream_headersize(transport->recv.copied != 0); |
| ret = xs_read_stream_header(transport, &msg, flags, want, |
| transport->recv.offset); |
| if (ret <= 0) |
| goto out_err; |
| transport->recv.offset = ret; |
| if (transport->recv.offset != want) |
| return transport->recv.offset; |
| transport->recv.len = be32_to_cpu(transport->recv.fraghdr) & |
| RPC_FRAGMENT_SIZE_MASK; |
| transport->recv.offset -= sizeof(transport->recv.fraghdr); |
| read = ret; |
| } |
| |
| switch (be32_to_cpu(transport->recv.calldir)) { |
| default: |
| msg.msg_flags |= MSG_TRUNC; |
| break; |
| case RPC_CALL: |
| ret = xs_read_stream_call(transport, &msg, flags); |
| break; |
| case RPC_REPLY: |
| ret = xs_read_stream_reply(transport, &msg, flags); |
| } |
| if (msg.msg_flags & MSG_TRUNC) { |
| transport->recv.calldir = cpu_to_be32(-1); |
| transport->recv.copied = -1; |
| } |
| if (ret < 0) |
| goto out_err; |
| read += ret; |
| if (transport->recv.offset < transport->recv.len) { |
| if (!(msg.msg_flags & MSG_TRUNC)) |
| return read; |
| msg.msg_flags = 0; |
| ret = xs_read_discard(transport->sock, &msg, flags, |
| transport->recv.len - transport->recv.offset); |
| if (ret <= 0) |
| goto out_err; |
| transport->recv.offset += ret; |
| read += ret; |
| if (transport->recv.offset != transport->recv.len) |
| return read; |
| } |
| if (xs_read_stream_request_done(transport)) { |
| trace_xs_stream_read_request(transport); |
| transport->recv.copied = 0; |
| } |
| transport->recv.offset = 0; |
| transport->recv.len = 0; |
| return read; |
| out_err: |
| return ret != 0 ? ret : -ESHUTDOWN; |
| } |
| |
| static __poll_t xs_poll_socket(struct sock_xprt *transport) |
| { |
| return transport->sock->ops->poll(transport->file, transport->sock, |
| NULL); |
| } |
| |
| static bool xs_poll_socket_readable(struct sock_xprt *transport) |
| { |
| __poll_t events = xs_poll_socket(transport); |
| |
| return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP); |
| } |
| |
| static void xs_poll_check_readable(struct sock_xprt *transport) |
| { |
| |
| clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); |
| if (!xs_poll_socket_readable(transport)) |
| return; |
| if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) |
| queue_work(xprtiod_workqueue, &transport->recv_worker); |
| } |
| |
| static void xs_stream_data_receive(struct sock_xprt *transport) |
| { |
| size_t read = 0; |
| ssize_t ret = 0; |
| |
| mutex_lock(&transport->recv_mutex); |
| if (transport->sock == NULL) |
| goto out; |
| for (;;) { |
| ret = xs_read_stream(transport, MSG_DONTWAIT); |
| if (ret < 0) |
| break; |
| read += ret; |
| cond_resched(); |
| } |
| if (ret == -ESHUTDOWN) |
| kernel_sock_shutdown(transport->sock, SHUT_RDWR); |
| else |
| xs_poll_check_readable(transport); |
| out: |
| mutex_unlock(&transport->recv_mutex); |
| trace_xs_stream_read_data(&transport->xprt, ret, read); |
| } |
| |
| static void xs_stream_data_receive_workfn(struct work_struct *work) |
| { |
| struct sock_xprt *transport = |
| container_of(work, struct sock_xprt, recv_worker); |
| unsigned int pflags = memalloc_nofs_save(); |
| |
| xs_stream_data_receive(transport); |
| memalloc_nofs_restore(pflags); |
| } |
| |
| static void |
| xs_stream_reset_connect(struct sock_xprt *transport) |
| { |
| transport->recv.offset = 0; |
| transport->recv.len = 0; |
| transport->recv.copied = 0; |
| transport->xmit.offset = 0; |
| } |
| |
| static void |
| xs_stream_start_connect(struct sock_xprt *transport) |
| { |
| transport->xprt.stat.connect_count++; |
| transport->xprt.stat.connect_start = jiffies; |
| } |
| |
| #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
| |
| static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek) |
| { |
| if (seek) |
| iov_iter_advance(&msg->msg_iter, seek); |
| return sock_sendmsg(sock, msg); |
| } |
| |
| static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek) |
| { |
| iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len); |
| return xs_sendmsg(sock, msg, seek); |
| } |
| |
| static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base) |
| { |
| int err; |
| |
| err = xdr_alloc_bvec(xdr, GFP_KERNEL); |
| if (err < 0) |
| return err; |
| |
| iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec, |
| xdr_buf_pagecount(xdr), |
| xdr->page_len + xdr->page_base); |
| return xs_sendmsg(sock, msg, base + xdr->page_base); |
| } |
| |
| #define xs_record_marker_len() sizeof(rpc_fraghdr) |
| |
| /* Common case: |
| * - stream transport |
| * - sending from byte 0 of the message |
| * - the message is wholly contained in @xdr's head iovec |
| */ |
| static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg, |
| rpc_fraghdr marker, struct kvec *vec, size_t base) |
| { |
| struct kvec iov[2] = { |
| [0] = { |
| .iov_base = &marker, |
| .iov_len = sizeof(marker) |
| }, |
| [1] = *vec, |
| }; |
| size_t len = iov[0].iov_len + iov[1].iov_len; |
| |
| iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len); |
| return xs_sendmsg(sock, msg, base); |
| } |
| |
| /** |
| * xs_sendpages - write pages directly to a socket |
| * @sock: socket to send on |
| * @addr: UDP only -- address of destination |
| * @addrlen: UDP only -- length of destination address |
| * @xdr: buffer containing this request |
| * @base: starting position in the buffer |
| * @rm: stream record marker field |
| * @sent_p: return the total number of bytes successfully queued for sending |
| * |
| */ |
| static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p) |
| { |
| struct msghdr msg = { |
| .msg_name = addr, |
| .msg_namelen = addrlen, |
| .msg_flags = XS_SENDMSG_FLAGS | MSG_MORE, |
| }; |
| unsigned int rmsize = rm ? sizeof(rm) : 0; |
| unsigned int remainder = rmsize + xdr->len - base; |
| unsigned int want; |
| int err = 0; |
| |
| if (unlikely(!sock)) |
| return -ENOTSOCK; |
| |
| want = xdr->head[0].iov_len + rmsize; |
| if (base < want) { |
| unsigned int len = want - base; |
| remainder -= len; |
| if (remainder == 0) |
| msg.msg_flags &= ~MSG_MORE; |
| if (rmsize) |
| err = xs_send_rm_and_kvec(sock, &msg, rm, |
| &xdr->head[0], base); |
| else |
| err = xs_send_kvec(sock, &msg, &xdr->head[0], base); |
| if (remainder == 0 || err != len) |
| goto out; |
| *sent_p += err; |
| base = 0; |
| } else |
| base -= want; |
| |
| if (base < xdr->page_len) { |
| unsigned int len = xdr->page_len - base; |
| remainder -= len; |
| if (remainder == 0) |
| msg.msg_flags &= ~MSG_MORE; |
| err = xs_send_pagedata(sock, &msg, xdr, base); |
| if (remainder == 0 || err != len) |
| goto out; |
| *sent_p += err; |
| base = 0; |
| } else |
| base -= xdr->page_len; |
| |
| if (base >= xdr->tail[0].iov_len) |
| return 0; |
| msg.msg_flags &= ~MSG_MORE; |
| err = xs_send_kvec(sock, &msg, &xdr->tail[0], base); |
| out: |
| if (err > 0) { |
| *sent_p += err; |
| err = 0; |
| } |
| return err; |
| } |
| |
| /** |
| * xs_nospace - handle transmit was incomplete |
| * @req: pointer to RPC request |
| * |
| */ |
| static int xs_nospace(struct rpc_rqst *req) |
| { |
| struct rpc_xprt *xprt = req->rq_xprt; |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| struct sock *sk = transport->inet; |
| int ret = -EAGAIN; |
| |
| dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
| req->rq_task->tk_pid, |
| req->rq_slen - transport->xmit.offset, |
| req->rq_slen); |
| |
| /* Protect against races with write_space */ |
| spin_lock_bh(&xprt->transport_lock); |
| |
| /* Don't race with disconnect */ |
| if (xprt_connected(xprt)) { |
| /* wait for more buffer space */ |
| sk->sk_write_pending++; |
| xprt_wait_for_buffer_space(xprt); |
| } else |
| ret = -ENOTCONN; |
| |
| spin_unlock_bh(&xprt->transport_lock); |
| |
| /* Race breaker in case memory is freed before above code is called */ |
| if (ret == -EAGAIN) { |
| struct socket_wq *wq; |
| |
| rcu_read_lock(); |
| wq = rcu_dereference(sk->sk_wq); |
| set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags); |
| rcu_read_unlock(); |
| |
| sk->sk_write_space(sk); |
| } |
| return ret; |
| } |
| |
| static void |
| xs_stream_prepare_request(struct rpc_rqst *req) |
| { |
| req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL); |
| } |
| |
| /* |
| * Determine if the previous message in the stream was aborted before it |
| * could complete transmission. |
| */ |
| static bool |
| xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req) |
| { |
| return transport->xmit.offset != 0 && req->rq_bytes_sent == 0; |
| } |
| |
| /* |
| * Return the stream record marker field for a record of length < 2^31-1 |
| */ |
| static rpc_fraghdr |
| xs_stream_record_marker(struct xdr_buf *xdr) |
| { |
| if (!xdr->len) |
| return 0; |
| return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len); |
| } |
| |
| /** |
| * xs_local_send_request - write an RPC request to an AF_LOCAL socket |
| * @req: pointer to RPC request |
| * |
| * Return values: |
| * 0: The request has been sent |
| * EAGAIN: The socket was blocked, please call again later to |
| * complete the request |
| * ENOTCONN: Caller needs to invoke connect logic then call again |
| * other: Some other error occured, the request was not sent |
| */ |
| static int xs_local_send_request(struct rpc_rqst *req) |
| { |
| struct rpc_xprt *xprt = req->rq_xprt; |
| struct sock_xprt *transport = |
| container_of(xprt, struct sock_xprt, xprt); |
| struct xdr_buf *xdr = &req->rq_snd_buf; |
| int status; |
| int sent = 0; |
| |
| /* Close the stream if the previous transmission was incomplete */ |
| if (xs_send_request_was_aborted(transport, req)) { |
| xs_close(xprt); |
| return -ENOTCONN; |
| } |
| |
| xs_pktdump("packet data:", |
| req->rq_svec->iov_base, req->rq_svec->iov_len); |
| |
| req->rq_xtime = ktime_get(); |
| status = xs_sendpages(transport->sock, NULL, 0, xdr, |
| transport->xmit.offset, |
| xs_stream_record_marker(xdr), |
| &sent); |
| dprintk("RPC: %s(%u) = %d\n", |
| __func__, xdr->len - transport->xmit.offset, status); |
| |
| if (status == -EAGAIN && sock_writeable(transport->inet)) |
| status = -ENOBUFS; |
| |
| if (likely(sent > 0) || status == 0) { |
| transport->xmit.offset += sent; |
| req->rq_bytes_sent = transport->xmit.offset; |
| if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
| req->rq_xmit_bytes_sent += transport->xmit.offset; |
| transport->xmit.offset = 0; |
| return 0; |
| } |
| status = -EAGAIN; |
| } |
| |
| switch (status) { |
| case -ENOBUFS: |
| break; |
| case -EAGAIN: |
| status = xs_nospace(req); |
| break; |
| default: |
| dprintk("RPC: sendmsg returned unrecognized error %d\n", |
| -status); |
| /* fall through */ |
| case -EPIPE: |
| xs_close(xprt); |
| status = -ENOTCONN; |
| } |
| |
| return status; |
| } |
| |
| /** |
| * xs_udp_send_request - write an RPC request to a UDP socket |
| * @req: pointer to RPC request |
| * |
| * Return values: |
| * 0: The request has been sent |
| * EAGAIN: The socket was blocked, please call again later to |
| * complete the request |
| * ENOTCONN: Caller needs to invoke connect logic then call again |
| * other: Some other error occurred, the request was not sent |
| */ |
| static int xs_udp_send_request(struct rpc_rqst *req) |
| { |
| struct rpc_xprt *xprt = req->rq_xprt; |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| struct xdr_buf *xdr = &req->rq_snd_buf; |
| int sent = 0; |
| int status; |
| |
| xs_pktdump("packet data:", |
| req->rq_svec->iov_base, |
| req->rq_svec->iov_len); |
| |
| if (!xprt_bound(xprt)) |
| return -ENOTCONN; |
| |
| if (!xprt_request_get_cong(xprt, req)) |
| return -EBADSLT; |
| |
| req->rq_xtime = ktime_get(); |
| status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, |
| xdr, 0, 0, &sent); |
| |
| dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
| xdr->len, status); |
| |
| /* firewall is blocking us, don't return -EAGAIN or we end up looping */ |
| if (status == -EPERM) |
| goto process_status; |
| |
| if (status == -EAGAIN && sock_writeable(transport->inet)) |
| status = -ENOBUFS; |
| |
| if (sent > 0 || status == 0) { |
| req->rq_xmit_bytes_sent += sent; |
| if (sent >= req->rq_slen) |
| return 0; |
| /* Still some bytes left; set up for a retry later. */ |
| status = -EAGAIN; |
| } |
| |
| process_status: |
| switch (status) { |
| case -ENOTSOCK: |
| status = -ENOTCONN; |
| /* Should we call xs_close() here? */ |
| break; |
| case -EAGAIN: |
| status = xs_nospace(req); |
| break; |
| case -ENETUNREACH: |
| case -ENOBUFS: |
| case -EPIPE: |
| case -ECONNREFUSED: |
| case -EPERM: |
| /* When the server has died, an ICMP port unreachable message |
| * prompts ECONNREFUSED. */ |
| break; |
| default: |
| dprintk("RPC: sendmsg returned unrecognized error %d\n", |
| -status); |
| } |
| |
| return status; |
| } |
| |
| /** |
| * xs_tcp_send_request - write an RPC request to a TCP socket |
| * @req: pointer to RPC request |
| * |
| * Return values: |
| * 0: The request has been sent |
| * EAGAIN: The socket was blocked, please call again later to |
| * complete the request |
| * ENOTCONN: Caller needs to invoke connect logic then call again |
| * other: Some other error occurred, the request was not sent |
| * |
| * XXX: In the case of soft timeouts, should we eventually give up |
| * if sendmsg is not able to make progress? |
| */ |
| static int xs_tcp_send_request(struct rpc_rqst *req) |
| { |
| struct rpc_xprt *xprt = req->rq_xprt; |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| struct xdr_buf *xdr = &req->rq_snd_buf; |
| bool vm_wait = false; |
| int status; |
| int sent; |
| |
| /* Close the stream if the previous transmission was incomplete */ |
| if (xs_send_request_was_aborted(transport, req)) { |
| if (transport->sock != NULL) |
| kernel_sock_shutdown(transport->sock, SHUT_RDWR); |
| return -ENOTCONN; |
| } |
| |
| xs_pktdump("packet data:", |
| req->rq_svec->iov_base, |
| req->rq_svec->iov_len); |
| |
| if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) |
| xs_tcp_set_socket_timeouts(xprt, transport->sock); |
| |
| /* Continue transmitting the packet/record. We must be careful |
| * to cope with writespace callbacks arriving _after_ we have |
| * called sendmsg(). */ |
| req->rq_xtime = ktime_get(); |
| while (1) { |
| sent = 0; |
| status = xs_sendpages(transport->sock, NULL, 0, xdr, |
| transport->xmit.offset, |
| xs_stream_record_marker(xdr), |
| &sent); |
| |
| dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
| xdr->len - transport->xmit.offset, status); |
| |
| /* If we've sent the entire packet, immediately |
| * reset the count of bytes sent. */ |
| transport->xmit.offset += sent; |
| req->rq_bytes_sent = transport->xmit.offset; |
| if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
| req->rq_xmit_bytes_sent += transport->xmit.offset; |
| transport->xmit.offset = 0; |
| return 0; |
| } |
| |
| WARN_ON_ONCE(sent == 0 && status == 0); |
| |
| if (status == -EAGAIN ) { |
| /* |
| * Return EAGAIN if we're sure we're hitting the |
| * socket send buffer limits. |
| */ |
| if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) |
| break; |
| /* |
| * Did we hit a memory allocation failure? |
| */ |
| if (sent == 0) { |
| status = -ENOBUFS; |
| if (vm_wait) |
| break; |
| /* Retry, knowing now that we're below the |
| * socket send buffer limit |
| */ |
| vm_wait = true; |
| } |
| continue; |
| } |
| if (status < 0) |
| break; |
| vm_wait = false; |
| } |
| |
| switch (status) { |
| case -ENOTSOCK: |
| status = -ENOTCONN; |
| /* Should we call xs_close() here? */ |
| break; |
| case -EAGAIN: |
| status = xs_nospace(req); |
| break; |
| case -ECONNRESET: |
| case -ECONNREFUSED: |
| case -ENOTCONN: |
| case -EADDRINUSE: |
| case -ENOBUFS: |
| case -EPIPE: |
| break; |
| default: |
| dprintk("RPC: sendmsg returned unrecognized error %d\n", |
| -status); |
| } |
| |
| return status; |
| } |
| |
| static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
| { |
| transport->old_data_ready = sk->sk_data_ready; |
| transport->old_state_change = sk->sk_state_change; |
| transport->old_write_space = sk->sk_write_space; |
| transport->old_error_report = sk->sk_error_report; |
| } |
| |
| static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) |
| { |
| sk->sk_data_ready = transport->old_data_ready; |
| sk->sk_state_change = transport->old_state_change; |
| sk->sk_write_space = transport->old_write_space; |
| sk->sk_error_report = transport->old_error_report; |
| } |
| |
| static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| |
| clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); |
| } |
| |
| static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) |
| { |
| smp_mb__before_atomic(); |
| clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| clear_bit(XPRT_CLOSING, &xprt->state); |
| xs_sock_reset_state_flags(xprt); |
| smp_mb__after_atomic(); |
| } |
| |
| /** |
| * xs_error_report - callback to handle TCP socket state errors |
| * @sk: socket |
| * |
| * Note: we don't call sock_error() since there may be a rpc_task |
| * using the socket, and so we don't want to clear sk->sk_err. |
| */ |
| static void xs_error_report(struct sock *sk) |
| { |
| struct rpc_xprt *xprt; |
| int err; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| if (!(xprt = xprt_from_sock(sk))) |
| goto out; |
| |
| err = -sk->sk_err; |
| if (err == 0) |
| goto out; |
| dprintk("RPC: xs_error_report client %p, error=%d...\n", |
| xprt, -err); |
| trace_rpc_socket_error(xprt, sk->sk_socket, err); |
| xprt_wake_pending_tasks(xprt, err); |
| out: |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static void xs_reset_transport(struct sock_xprt *transport) |
| { |
| struct socket *sock = transport->sock; |
| struct sock *sk = transport->inet; |
| struct rpc_xprt *xprt = &transport->xprt; |
| struct file *filp = transport->file; |
| |
| if (sk == NULL) |
| return; |
| |
| if (atomic_read(&transport->xprt.swapper)) |
| sk_clear_memalloc(sk); |
| |
| kernel_sock_shutdown(sock, SHUT_RDWR); |
| |
| mutex_lock(&transport->recv_mutex); |
| write_lock_bh(&sk->sk_callback_lock); |
| transport->inet = NULL; |
| transport->sock = NULL; |
| transport->file = NULL; |
| |
| sk->sk_user_data = NULL; |
| |
| xs_restore_old_callbacks(transport, sk); |
| xprt_clear_connected(xprt); |
| write_unlock_bh(&sk->sk_callback_lock); |
| xs_sock_reset_connection_flags(xprt); |
| /* Reset stream record info */ |
| xs_stream_reset_connect(transport); |
| mutex_unlock(&transport->recv_mutex); |
| |
| trace_rpc_socket_close(xprt, sock); |
| fput(filp); |
| |
| xprt_disconnect_done(xprt); |
| } |
| |
| /** |
| * xs_close - close a socket |
| * @xprt: transport |
| * |
| * This is used when all requests are complete; ie, no DRC state remains |
| * on the server we want to save. |
| * |
| * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with |
| * xs_reset_transport() zeroing the socket from underneath a writer. |
| */ |
| static void xs_close(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| |
| dprintk("RPC: xs_close xprt %p\n", xprt); |
| |
| xs_reset_transport(transport); |
| xprt->reestablish_timeout = 0; |
| } |
| |
| static void xs_inject_disconnect(struct rpc_xprt *xprt) |
| { |
| dprintk("RPC: injecting transport disconnect on xprt=%p\n", |
| xprt); |
| xprt_disconnect_done(xprt); |
| } |
| |
| static void xs_xprt_free(struct rpc_xprt *xprt) |
| { |
| xs_free_peer_addresses(xprt); |
| xprt_free(xprt); |
| } |
| |
| /** |
| * xs_destroy - prepare to shutdown a transport |
| * @xprt: doomed transport |
| * |
| */ |
| static void xs_destroy(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *transport = container_of(xprt, |
| struct sock_xprt, xprt); |
| dprintk("RPC: xs_destroy xprt %p\n", xprt); |
| |
| cancel_delayed_work_sync(&transport->connect_worker); |
| xs_close(xprt); |
| cancel_work_sync(&transport->recv_worker); |
| xs_xprt_free(xprt); |
| module_put(THIS_MODULE); |
| } |
| |
| /** |
| * xs_udp_data_read_skb - receive callback for UDP sockets |
| * @xprt: transport |
| * @sk: socket |
| * @skb: skbuff |
| * |
| */ |
| static void xs_udp_data_read_skb(struct rpc_xprt *xprt, |
| struct sock *sk, |
| struct sk_buff *skb) |
| { |
| struct rpc_task *task; |
| struct rpc_rqst *rovr; |
| int repsize, copied; |
| u32 _xid; |
| __be32 *xp; |
| |
| repsize = skb->len; |
| if (repsize < 4) { |
| dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
| return; |
| } |
| |
| /* Copy the XID from the skb... */ |
| xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); |
| if (xp == NULL) |
| return; |
| |
| /* Look up and lock the request corresponding to the given XID */ |
| spin_lock(&xprt->queue_lock); |
| rovr = xprt_lookup_rqst(xprt, *xp); |
| if (!rovr) |
| goto out_unlock; |
| xprt_pin_rqst(rovr); |
| xprt_update_rtt(rovr->rq_task); |
| spin_unlock(&xprt->queue_lock); |
| task = rovr->rq_task; |
| |
| if ((copied = rovr->rq_private_buf.buflen) > repsize) |
| copied = repsize; |
| |
| /* Suck it into the iovec, verify checksum if not done by hw. */ |
| if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { |
| spin_lock(&xprt->queue_lock); |
| __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); |
| goto out_unpin; |
| } |
| |
| |
| spin_lock_bh(&xprt->transport_lock); |
| xprt_adjust_cwnd(xprt, task, copied); |
| spin_unlock_bh(&xprt->transport_lock); |
| spin_lock(&xprt->queue_lock); |
| xprt_complete_rqst(task, copied); |
| __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); |
| out_unpin: |
| xprt_unpin_rqst(rovr); |
| out_unlock: |
| spin_unlock(&xprt->queue_lock); |
| } |
| |
| static void xs_udp_data_receive(struct sock_xprt *transport) |
| { |
| struct sk_buff *skb; |
| struct sock *sk; |
| int err; |
| |
| mutex_lock(&transport->recv_mutex); |
| sk = transport->inet; |
| if (sk == NULL) |
| goto out; |
| for (;;) { |
| skb = skb_recv_udp(sk, 0, 1, &err); |
| if (skb == NULL) |
| break; |
| xs_udp_data_read_skb(&transport->xprt, sk, skb); |
| consume_skb(skb); |
| cond_resched(); |
| } |
| xs_poll_check_readable(transport); |
| out: |
| mutex_unlock(&transport->recv_mutex); |
| } |
| |
| static void xs_udp_data_receive_workfn(struct work_struct *work) |
| { |
| struct sock_xprt *transport = |
| container_of(work, struct sock_xprt, recv_worker); |
| unsigned int pflags = memalloc_nofs_save(); |
| |
| xs_udp_data_receive(transport); |
| memalloc_nofs_restore(pflags); |
| } |
| |
| /** |
| * xs_data_ready - "data ready" callback for UDP sockets |
| * @sk: socket with data to read |
| * |
| */ |
| static void xs_data_ready(struct sock *sk) |
| { |
| struct rpc_xprt *xprt; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| dprintk("RPC: xs_data_ready...\n"); |
| xprt = xprt_from_sock(sk); |
| if (xprt != NULL) { |
| struct sock_xprt *transport = container_of(xprt, |
| struct sock_xprt, xprt); |
| transport->old_data_ready(sk); |
| /* Any data means we had a useful conversation, so |
| * then we don't need to delay the next reconnect |
| */ |
| if (xprt->reestablish_timeout) |
| xprt->reestablish_timeout = 0; |
| if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) |
| queue_work(xprtiod_workqueue, &transport->recv_worker); |
| } |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| /* |
| * Helper function to force a TCP close if the server is sending |
| * junk and/or it has put us in CLOSE_WAIT |
| */ |
| static void xs_tcp_force_close(struct rpc_xprt *xprt) |
| { |
| xprt_force_disconnect(xprt); |
| } |
| |
| #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
| static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) |
| { |
| return PAGE_SIZE; |
| } |
| #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
| |
| /** |
| * xs_tcp_state_change - callback to handle TCP socket state changes |
| * @sk: socket whose state has changed |
| * |
| */ |
| static void xs_tcp_state_change(struct sock *sk) |
| { |
| struct rpc_xprt *xprt; |
| struct sock_xprt *transport; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| if (!(xprt = xprt_from_sock(sk))) |
| goto out; |
| dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
| dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", |
| sk->sk_state, xprt_connected(xprt), |
| sock_flag(sk, SOCK_DEAD), |
| sock_flag(sk, SOCK_ZAPPED), |
| sk->sk_shutdown); |
| |
| transport = container_of(xprt, struct sock_xprt, xprt); |
| trace_rpc_socket_state_change(xprt, sk->sk_socket); |
| switch (sk->sk_state) { |
| case TCP_ESTABLISHED: |
| spin_lock(&xprt->transport_lock); |
| if (!xprt_test_and_set_connected(xprt)) { |
| xprt->connect_cookie++; |
| clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); |
| xprt_clear_connecting(xprt); |
| |
| xprt->stat.connect_count++; |
| xprt->stat.connect_time += (long)jiffies - |
| xprt->stat.connect_start; |
| xprt_wake_pending_tasks(xprt, -EAGAIN); |
| } |
| spin_unlock(&xprt->transport_lock); |
| break; |
| case TCP_FIN_WAIT1: |
| /* The client initiated a shutdown of the socket */ |
| xprt->connect_cookie++; |
| xprt->reestablish_timeout = 0; |
| set_bit(XPRT_CLOSING, &xprt->state); |
| smp_mb__before_atomic(); |
| clear_bit(XPRT_CONNECTED, &xprt->state); |
| clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| smp_mb__after_atomic(); |
| break; |
| case TCP_CLOSE_WAIT: |
| /* The server initiated a shutdown of the socket */ |
| xprt->connect_cookie++; |
| clear_bit(XPRT_CONNECTED, &xprt->state); |
| xs_tcp_force_close(xprt); |
| /* fall through */ |
| case TCP_CLOSING: |
| /* |
| * If the server closed down the connection, make sure that |
| * we back off before reconnecting |
| */ |
| if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
| xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| break; |
| case TCP_LAST_ACK: |
| set_bit(XPRT_CLOSING, &xprt->state); |
| smp_mb__before_atomic(); |
| clear_bit(XPRT_CONNECTED, &xprt->state); |
| smp_mb__after_atomic(); |
| break; |
| case TCP_CLOSE: |
| if (test_and_clear_bit(XPRT_SOCK_CONNECTING, |
| &transport->sock_state)) |
| xprt_clear_connecting(xprt); |
| clear_bit(XPRT_CLOSING, &xprt->state); |
| /* Trigger the socket release */ |
| xs_tcp_force_close(xprt); |
| } |
| out: |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static void xs_write_space(struct sock *sk) |
| { |
| struct socket_wq *wq; |
| struct rpc_xprt *xprt; |
| |
| if (!sk->sk_socket) |
| return; |
| clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| |
| if (unlikely(!(xprt = xprt_from_sock(sk)))) |
| return; |
| rcu_read_lock(); |
| wq = rcu_dereference(sk->sk_wq); |
| if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) |
| goto out; |
| |
| if (xprt_write_space(xprt)) |
| sk->sk_write_pending--; |
| out: |
| rcu_read_unlock(); |
| } |
| |
| /** |
| * xs_udp_write_space - callback invoked when socket buffer space |
| * becomes available |
| * @sk: socket whose state has changed |
| * |
| * Called when more output buffer space is available for this socket. |
| * We try not to wake our writers until they can make "significant" |
| * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
| * with a bunch of small requests. |
| */ |
| static void xs_udp_write_space(struct sock *sk) |
| { |
| read_lock_bh(&sk->sk_callback_lock); |
| |
| /* from net/core/sock.c:sock_def_write_space */ |
| if (sock_writeable(sk)) |
| xs_write_space(sk); |
| |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| /** |
| * xs_tcp_write_space - callback invoked when socket buffer space |
| * becomes available |
| * @sk: socket whose state has changed |
| * |
| * Called when more output buffer space is available for this socket. |
| * We try not to wake our writers until they can make "significant" |
| * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
| * with a bunch of small requests. |
| */ |
| static void xs_tcp_write_space(struct sock *sk) |
| { |
| read_lock_bh(&sk->sk_callback_lock); |
| |
| /* from net/core/stream.c:sk_stream_write_space */ |
| if (sk_stream_is_writeable(sk)) |
| xs_write_space(sk); |
| |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| struct sock *sk = transport->inet; |
| |
| if (transport->rcvsize) { |
| sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
| } |
| if (transport->sndsize) { |
| sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
| sk->sk_write_space(sk); |
| } |
| } |
| |
| /** |
| * xs_udp_set_buffer_size - set send and receive limits |
| * @xprt: generic transport |
| * @sndsize: requested size of send buffer, in bytes |
| * @rcvsize: requested size of receive buffer, in bytes |
| * |
| * Set socket send and receive buffer size limits. |
| */ |
| static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| |
| transport->sndsize = 0; |
| if (sndsize) |
| transport->sndsize = sndsize + 1024; |
| transport->rcvsize = 0; |
| if (rcvsize) |
| transport->rcvsize = rcvsize + 1024; |
| |
| xs_udp_do_set_buffer_size(xprt); |
| } |
| |
| /** |
| * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport |
| * @xprt: controlling transport |
| * @task: task that timed out |
| * |
| * Adjust the congestion window after a retransmit timeout has occurred. |
| */ |
| static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) |
| { |
| spin_lock_bh(&xprt->transport_lock); |
| xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); |
| spin_unlock_bh(&xprt->transport_lock); |
| } |
| |
| static int xs_get_random_port(void) |
| { |
| unsigned short min = xprt_min_resvport, max = xprt_max_resvport; |
| unsigned short range; |
| unsigned short rand; |
| |
| if (max < min) |
| return -EADDRINUSE; |
| range = max - min + 1; |
| rand = (unsigned short) prandom_u32() % range; |
| return rand + min; |
| } |
| |
| /** |
| * xs_set_reuseaddr_port - set the socket's port and address reuse options |
| * @sock: socket |
| * |
| * Note that this function has to be called on all sockets that share the |
| * same port, and it must be called before binding. |
| */ |
| static void xs_sock_set_reuseport(struct socket *sock) |
| { |
| int opt = 1; |
| |
| kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, |
| (char *)&opt, sizeof(opt)); |
| } |
| |
| static unsigned short xs_sock_getport(struct socket *sock) |
| { |
| struct sockaddr_storage buf; |
| unsigned short port = 0; |
| |
| if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0) |
| goto out; |
| switch (buf.ss_family) { |
| case AF_INET6: |
| port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); |
| break; |
| case AF_INET: |
| port = ntohs(((struct sockaddr_in *)&buf)->sin_port); |
| } |
| out: |
| return port; |
| } |
| |
| /** |
| * xs_set_port - reset the port number in the remote endpoint address |
| * @xprt: generic transport |
| * @port: new port number |
| * |
| */ |
| static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) |
| { |
| dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
| |
| rpc_set_port(xs_addr(xprt), port); |
| xs_update_peer_port(xprt); |
| } |
| |
| static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) |
| { |
| if (transport->srcport == 0) |
| transport->srcport = xs_sock_getport(sock); |
| } |
| |
| static int xs_get_srcport(struct sock_xprt *transport) |
| { |
| int port = transport->srcport; |
| |
| if (port == 0 && transport->xprt.resvport) |
| port = xs_get_random_port(); |
| return port; |
| } |
| |
| static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) |
| { |
| if (transport->srcport != 0) |
| transport->srcport = 0; |
| if (!transport->xprt.resvport) |
| return 0; |
| if (port <= xprt_min_resvport || port > xprt_max_resvport) |
| return xprt_max_resvport; |
| return --port; |
| } |
| static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
| { |
| struct sockaddr_storage myaddr; |
| int err, nloop = 0; |
| int port = xs_get_srcport(transport); |
| unsigned short last; |
| |
| /* |
| * If we are asking for any ephemeral port (i.e. port == 0 && |
| * transport->xprt.resvport == 0), don't bind. Let the local |
| * port selection happen implicitly when the socket is used |
| * (for example at connect time). |
| * |
| * This ensures that we can continue to establish TCP |
| * connections even when all local ephemeral ports are already |
| * a part of some TCP connection. This makes no difference |
| * for UDP sockets, but also doens't harm them. |
| * |
| * If we're asking for any reserved port (i.e. port == 0 && |
| * transport->xprt.resvport == 1) xs_get_srcport above will |
| * ensure that port is non-zero and we will bind as needed. |
| */ |
| if (port <= 0) |
| return port; |
| |
| memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); |
| do { |
| rpc_set_port((struct sockaddr *)&myaddr, port); |
| err = kernel_bind(sock, (struct sockaddr *)&myaddr, |
| transport->xprt.addrlen); |
| if (err == 0) { |
| transport->srcport = port; |
| break; |
| } |
| last = port; |
| port = xs_next_srcport(transport, port); |
| if (port > last) |
| nloop++; |
| } while (err == -EADDRINUSE && nloop != 2); |
| |
| if (myaddr.ss_family == AF_INET) |
| dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, |
| &((struct sockaddr_in *)&myaddr)->sin_addr, |
| port, err ? "failed" : "ok", err); |
| else |
| dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, |
| &((struct sockaddr_in6 *)&myaddr)->sin6_addr, |
| port, err ? "failed" : "ok", err); |
| return err; |
| } |
| |
| /* |
| * We don't support autobind on AF_LOCAL sockets |
| */ |
| static void xs_local_rpcbind(struct rpc_task *task) |
| { |
| xprt_set_bound(task->tk_xprt); |
| } |
| |
| static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) |
| { |
| } |
| |
| #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| static struct lock_class_key xs_key[2]; |
| static struct lock_class_key xs_slock_key[2]; |
| |
| static inline void xs_reclassify_socketu(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| |
| sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", |
| &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); |
| } |
| |
| static inline void xs_reclassify_socket4(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| |
| sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", |
| &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); |
| } |
| |
| static inline void xs_reclassify_socket6(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| |
| sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", |
| &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); |
| } |
| |
| static inline void xs_reclassify_socket(int family, struct socket *sock) |
| { |
| if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) |
| return; |
| |
| switch (family) { |
| case AF_LOCAL: |
| xs_reclassify_socketu(sock); |
| break; |
| case AF_INET: |
| xs_reclassify_socket4(sock); |
| break; |
| case AF_INET6: |
| xs_reclassify_socket6(sock); |
| break; |
| } |
| } |
| #else |
| static inline void xs_reclassify_socket(int family, struct socket *sock) |
| { |
| } |
| #endif |
| |
| static void xs_dummy_setup_socket(struct work_struct *work) |
| { |
| } |
| |
| static struct socket *xs_create_sock(struct rpc_xprt *xprt, |
| struct sock_xprt *transport, int family, int type, |
| int protocol, bool reuseport) |
| { |
| struct file *filp; |
| struct socket *sock; |
| int err; |
| |
| err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); |
| if (err < 0) { |
| dprintk("RPC: can't create %d transport socket (%d).\n", |
| protocol, -err); |
| goto out; |
| } |
| xs_reclassify_socket(family, sock); |
| |
| if (reuseport) |
| xs_sock_set_reuseport(sock); |
| |
| err = xs_bind(transport, sock); |
| if (err) { |
| sock_release(sock); |
| goto out; |
| } |
| |
| filp = sock_alloc_file(sock, O_NONBLOCK, NULL); |
| if (IS_ERR(filp)) |
| return ERR_CAST(filp); |
| transport->file = filp; |
| |
| return sock; |
| out: |
| return ERR_PTR(err); |
| } |
| |
| static int xs_local_finish_connecting(struct rpc_xprt *xprt, |
| struct socket *sock) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, |
| xprt); |
| |
| if (!transport->inet) { |
| struct sock *sk = sock->sk; |
| |
| write_lock_bh(&sk->sk_callback_lock); |
| |
| xs_save_old_callbacks(transport, sk); |
| |
| sk->sk_user_data = xprt; |
| sk->sk_data_ready = xs_data_ready; |
| sk->sk_write_space = xs_udp_write_space; |
| sock_set_flag(sk, SOCK_FASYNC); |
| sk->sk_error_report = xs_error_report; |
| |
| xprt_clear_connected(xprt); |
| |
| /* Reset to new socket */ |
| transport->sock = sock; |
| transport->inet = sk; |
| |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| xs_stream_start_connect(transport); |
| |
| return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); |
| } |
| |
| /** |
| * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint |
| * @transport: socket transport to connect |
| */ |
| static int xs_local_setup_socket(struct sock_xprt *transport) |
| { |
| struct rpc_xprt *xprt = &transport->xprt; |
| struct file *filp; |
| struct socket *sock; |
| int status = -EIO; |
| |
| status = __sock_create(xprt->xprt_net, AF_LOCAL, |
| SOCK_STREAM, 0, &sock, 1); |
| if (status < 0) { |
| dprintk("RPC: can't create AF_LOCAL " |
| "transport socket (%d).\n", -status); |
| goto out; |
| } |
| xs_reclassify_socket(AF_LOCAL, sock); |
| |
| filp = sock_alloc_file(sock, O_NONBLOCK, NULL); |
| if (IS_ERR(filp)) { |
| status = PTR_ERR(filp); |
| goto out; |
| } |
| transport->file = filp; |
| |
| dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", |
| xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
| |
| status = xs_local_finish_connecting(xprt, sock); |
| trace_rpc_socket_connect(xprt, sock, status); |
| switch (status) { |
| case 0: |
| dprintk("RPC: xprt %p connected to %s\n", |
| xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
| xprt->stat.connect_count++; |
| xprt->stat.connect_time += (long)jiffies - |
| xprt->stat.connect_start; |
| xprt_set_connected(xprt); |
| case -ENOBUFS: |
| break; |
| case -ENOENT: |
| dprintk("RPC: xprt %p: socket %s does not exist\n", |
| xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
| break; |
| case -ECONNREFUSED: |
| dprintk("RPC: xprt %p: connection refused for %s\n", |
| xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); |
| break; |
| default: |
| printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", |
| __func__, -status, |
| xprt->address_strings[RPC_DISPLAY_ADDR]); |
| } |
| |
| out: |
| xprt_clear_connecting(xprt); |
| xprt_wake_pending_tasks(xprt, status); |
| return status; |
| } |
| |
| static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| int ret; |
| |
| if (RPC_IS_ASYNC(task)) { |
| /* |
| * We want the AF_LOCAL connect to be resolved in the |
| * filesystem namespace of the process making the rpc |
| * call. Thus we connect synchronously. |
| * |
| * If we want to support asynchronous AF_LOCAL calls, |
| * we'll need to figure out how to pass a namespace to |
| * connect. |
| */ |
| rpc_exit(task, -ENOTCONN); |
| return; |
| } |
| ret = xs_local_setup_socket(transport); |
| if (ret && !RPC_IS_SOFTCONN(task)) |
| msleep_interruptible(15000); |
| } |
| |
| #if IS_ENABLED(CONFIG_SUNRPC_SWAP) |
| /* |
| * Note that this should be called with XPRT_LOCKED held (or when we otherwise |
| * know that we have exclusive access to the socket), to guard against |
| * races with xs_reset_transport. |
| */ |
| static void xs_set_memalloc(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, |
| xprt); |
| |
| /* |
| * If there's no sock, then we have nothing to set. The |
| * reconnecting process will get it for us. |
| */ |
| if (!transport->inet) |
| return; |
| if (atomic_read(&xprt->swapper)) |
| sk_set_memalloc(transport->inet); |
| } |
| |
| /** |
| * xs_enable_swap - Tag this transport as being used for swap. |
| * @xprt: transport to tag |
| * |
| * Take a reference to this transport on behalf of the rpc_clnt, and |
| * optionally mark it for swapping if it wasn't already. |
| */ |
| static int |
| xs_enable_swap(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); |
| |
| if (atomic_inc_return(&xprt->swapper) != 1) |
| return 0; |
| if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) |
| return -ERESTARTSYS; |
| if (xs->inet) |
| sk_set_memalloc(xs->inet); |
| xprt_release_xprt(xprt, NULL); |
| return 0; |
| } |
| |
| /** |
| * xs_disable_swap - Untag this transport as being used for swap. |
| * @xprt: transport to tag |
| * |
| * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the |
| * swapper refcount goes to 0, untag the socket as a memalloc socket. |
| */ |
| static void |
| xs_disable_swap(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); |
| |
| if (!atomic_dec_and_test(&xprt->swapper)) |
| return; |
| if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) |
| return; |
| if (xs->inet) |
| sk_clear_memalloc(xs->inet); |
| xprt_release_xprt(xprt, NULL); |
| } |
| #else |
| static void xs_set_memalloc(struct rpc_xprt *xprt) |
| { |
| } |
| |
| static int |
| xs_enable_swap(struct rpc_xprt *xprt) |
| { |
| return -EINVAL; |
| } |
| |
| static void |
| xs_disable_swap(struct rpc_xprt *xprt) |
| { |
| } |
| #endif |
| |
| static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| |
| if (!transport->inet) { |
| struct sock *sk = sock->sk; |
| |
| write_lock_bh(&sk->sk_callback_lock); |
| |
| xs_save_old_callbacks(transport, sk); |
| |
| sk->sk_user_data = xprt; |
| sk->sk_data_ready = xs_data_ready; |
| sk->sk_write_space = xs_udp_write_space; |
| sock_set_flag(sk, SOCK_FASYNC); |
| |
| xprt_set_connected(xprt); |
| |
| /* Reset to new socket */ |
| transport->sock = sock; |
| transport->inet = sk; |
| |
| xs_set_memalloc(xprt); |
| |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| xs_udp_do_set_buffer_size(xprt); |
| |
| xprt->stat.connect_start = jiffies; |
| } |
| |
| static void xs_udp_setup_socket(struct work_struct *work) |
| { |
| struct sock_xprt *transport = |
| container_of(work, struct sock_xprt, connect_worker.work); |
| struct rpc_xprt *xprt = &transport->xprt; |
| struct socket *sock; |
| int status = -EIO; |
| |
| sock = xs_create_sock(xprt, transport, |
| xs_addr(xprt)->sa_family, SOCK_DGRAM, |
| IPPROTO_UDP, false); |
| if (IS_ERR(sock)) |
| goto out; |
| |
| dprintk("RPC: worker connecting xprt %p via %s to " |
| "%s (port %s)\n", xprt, |
| xprt->address_strings[RPC_DISPLAY_PROTO], |
| xprt->address_strings[RPC_DISPLAY_ADDR], |
| xprt->address_strings[RPC_DISPLAY_PORT]); |
| |
| xs_udp_finish_connecting(xprt, sock); |
| trace_rpc_socket_connect(xprt, sock, 0); |
| status = 0; |
| out: |
| xprt_clear_connecting(xprt); |
| xprt_unlock_connect(xprt, transport); |
| xprt_wake_pending_tasks(xprt, status); |
| } |
| |
| /** |
| * xs_tcp_shutdown - gracefully shut down a TCP socket |
| * @xprt: transport |
| * |
| * Initiates a graceful shutdown of the TCP socket by calling the |
| * equivalent of shutdown(SHUT_RDWR); |
| */ |
| static void xs_tcp_shutdown(struct rpc_xprt *xprt) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| struct socket *sock = transport->sock; |
| int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE; |
| |
| if (sock == NULL) |
| return; |
| switch (skst) { |
| default: |
| kernel_sock_shutdown(sock, SHUT_RDWR); |
| trace_rpc_socket_shutdown(xprt, sock); |
| break; |
| case TCP_CLOSE: |
| case TCP_TIME_WAIT: |
| xs_reset_transport(transport); |
| } |
| } |
| |
| static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, |
| struct socket *sock) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| unsigned int keepidle; |
| unsigned int keepcnt; |
| unsigned int opt_on = 1; |
| unsigned int timeo; |
| |
| spin_lock_bh(&xprt->transport_lock); |
| keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); |
| keepcnt = xprt->timeout->to_retries + 1; |
| timeo = jiffies_to_msecs(xprt->timeout->to_initval) * |
| (xprt->timeout->to_retries + 1); |
| clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); |
| spin_unlock_bh(&xprt->transport_lock); |
| |
| /* TCP Keepalive options */ |
| kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
| (char *)&opt_on, sizeof(opt_on)); |
| kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, |
| (char *)&keepidle, sizeof(keepidle)); |
| kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, |
| (char *)&keepidle, sizeof(keepidle)); |
| kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, |
| (char *)&keepcnt, sizeof(keepcnt)); |
| |
| /* TCP user timeout (see RFC5482) */ |
| kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, |
| (char *)&timeo, sizeof(timeo)); |
| } |
| |
| static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, |
| unsigned long connect_timeout, |
| unsigned long reconnect_timeout) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| struct rpc_timeout to; |
| unsigned long initval; |
| |
| spin_lock_bh(&xprt->transport_lock); |
| if (reconnect_timeout < xprt->max_reconnect_timeout) |
| xprt->max_reconnect_timeout = reconnect_timeout; |
| if (connect_timeout < xprt->connect_timeout) { |
| memcpy(&to, xprt->timeout, sizeof(to)); |
| initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); |
| /* Arbitrary lower limit */ |
| if (initval < XS_TCP_INIT_REEST_TO << 1) |
| initval = XS_TCP_INIT_REEST_TO << 1; |
| to.to_initval = initval; |
| to.to_maxval = initval; |
| memcpy(&transport->tcp_timeout, &to, |
| sizeof(transport->tcp_timeout)); |
| xprt->timeout = &transport->tcp_timeout; |
| xprt->connect_timeout = connect_timeout; |
| } |
| set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); |
| spin_unlock_bh(&xprt->transport_lock); |
| } |
| |
| static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| int ret = -ENOTCONN; |
| |
| if (!transport->inet) { |
| struct sock *sk = sock->sk; |
| unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC; |
| |
| /* Avoid temporary address, they are bad for long-lived |
| * connections such as NFS mounts. |
| * RFC4941, section 3.6 suggests that: |
| * Individual applications, which have specific |
| * knowledge about the normal duration of connections, |
| * MAY override this as appropriate. |
| */ |
| kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES, |
| (char *)&addr_pref, sizeof(addr_pref)); |
| |
| xs_tcp_set_socket_timeouts(xprt, sock); |
| |
| write_lock_bh(&sk->sk_callback_lock); |
| |
| xs_save_old_callbacks(transport, sk); |
| |
| sk->sk_user_data = xprt; |
| sk->sk_data_ready = xs_data_ready; |
| sk->sk_state_change = xs_tcp_state_change; |
| sk->sk_write_space = xs_tcp_write_space; |
| sock_set_flag(sk, SOCK_FASYNC); |
| sk->sk_error_report = xs_error_report; |
| |
| /* socket options */ |
| sock_reset_flag(sk, SOCK_LINGER); |
| tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
| |
| xprt_clear_connected(xprt); |
| |
| /* Reset to new socket */ |
| transport->sock = sock; |
| transport->inet = sk; |
| |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| if (!xprt_bound(xprt)) |
| goto out; |
| |
| xs_set_memalloc(xprt); |
| |
| xs_stream_start_connect(transport); |
| |
| /* Tell the socket layer to start connecting... */ |
| set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); |
| ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
| switch (ret) { |
| case 0: |
| xs_set_srcport(transport, sock); |
| /* fall through */ |
| case -EINPROGRESS: |
| /* SYN_SENT! */ |
| if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
| xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| break; |
| case -EADDRNOTAVAIL: |
| /* Source port number is unavailable. Try a new one! */ |
| transport->srcport = 0; |
| } |
| out: |
| return ret; |
| } |
| |
| /** |
| * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint |
| * @work: queued work item |
| * |
| * Invoked by a work queue tasklet. |
| */ |
| static void xs_tcp_setup_socket(struct work_struct *work) |
| { |
| struct sock_xprt *transport = |
| container_of(work, struct sock_xprt, connect_worker.work); |
| struct socket *sock = transport->sock; |
| struct rpc_xprt *xprt = &transport->xprt; |
| int status = -EIO; |
| |
| if (!sock) { |
| sock = xs_create_sock(xprt, transport, |
| xs_addr(xprt)->sa_family, SOCK_STREAM, |
| IPPROTO_TCP, true); |
| if (IS_ERR(sock)) { |
| status = PTR_ERR(sock); |
| goto out; |
| } |
| } |
| |
| dprintk("RPC: worker connecting xprt %p via %s to " |
| "%s (port %s)\n", xprt, |
| xprt->address_strings[RPC_DISPLAY_PROTO], |
| xprt->address_strings[RPC_DISPLAY_ADDR], |
| xprt->address_strings[RPC_DISPLAY_PORT]); |
| |
| status = xs_tcp_finish_connecting(xprt, sock); |
| trace_rpc_socket_connect(xprt, sock, status); |
| dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
| xprt, -status, xprt_connected(xprt), |
| sock->sk->sk_state); |
| switch (status) { |
| default: |
| printk("%s: connect returned unhandled error %d\n", |
| __func__, status); |
| /* fall through */ |
| case -EADDRNOTAVAIL: |
| /* We're probably in TIME_WAIT. Get rid of existing socket, |
| * and retry |
| */ |
| xs_tcp_force_close(xprt); |
| break; |
| case 0: |
| case -EINPROGRESS: |
| case -EALREADY: |
| xprt_unlock_connect(xprt, transport); |
| return; |
| case -EINVAL: |
| /* Happens, for instance, if the user specified a link |
| * local IPv6 address without a scope-id. |
| */ |
| case -ECONNREFUSED: |
| case -ECONNRESET: |
| case -ENETDOWN: |
| case -ENETUNREACH: |
| case -EHOSTUNREACH: |
| case -EADDRINUSE: |
| case -ENOBUFS: |
| /* |
| * xs_tcp_force_close() wakes tasks with -EIO. |
| * We need to wake them first to ensure the |
| * correct error code. |
| */ |
| xprt_wake_pending_tasks(xprt, status); |
| xs_tcp_force_close(xprt); |
| goto out; |
| } |
| status = -EAGAIN; |
| out: |
| xprt_clear_connecting(xprt); |
| xprt_unlock_connect(xprt, transport); |
| xprt_wake_pending_tasks(xprt, status); |
| } |
| |
| static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt) |
| { |
| unsigned long start, now = jiffies; |
| |
| start = xprt->stat.connect_start + xprt->reestablish_timeout; |
| if (time_after(start, now)) |
| return start - now; |
| return 0; |
| } |
| |
| static void xs_reconnect_backoff(struct rpc_xprt *xprt) |
| { |
| xprt->reestablish_timeout <<= 1; |
| if (xprt->reestablish_timeout > xprt->max_reconnect_timeout) |
| xprt->reestablish_timeout = xprt->max_reconnect_timeout; |
| if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) |
| xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| } |
| |
| /** |
| * xs_connect - connect a socket to a remote endpoint |
| * @xprt: pointer to transport structure |
| * @task: address of RPC task that manages state of connect request |
| * |
| * TCP: If the remote end dropped the connection, delay reconnecting. |
| * |
| * UDP socket connects are synchronous, but we use a work queue anyway |
| * to guarantee that even unprivileged user processes can set up a |
| * socket on a privileged port. |
| * |
| * If a UDP socket connect fails, the delay behavior here prevents |
| * retry floods (hard mounts). |
| */ |
| static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| unsigned long delay = 0; |
| |
| WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); |
| |
| if (transport->sock != NULL) { |
| dprintk("RPC: xs_connect delayed xprt %p for %lu " |
| "seconds\n", |
| xprt, xprt->reestablish_timeout / HZ); |
| |
| /* Start by resetting any existing state */ |
| xs_reset_transport(transport); |
| |
| delay = xs_reconnect_delay(xprt); |
| xs_reconnect_backoff(xprt); |
| |
| } else |
| dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
| |
| queue_delayed_work(xprtiod_workqueue, |
| &transport->connect_worker, |
| delay); |
| } |
| |
| /** |
| * xs_local_print_stats - display AF_LOCAL socket-specifc stats |
| * @xprt: rpc_xprt struct containing statistics |
| * @seq: output file |
| * |
| */ |
| static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
| { |
| long idle_time = 0; |
| |
| if (xprt_connected(xprt)) |
| idle_time = (long)(jiffies - xprt->last_used) / HZ; |
| |
| seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " |
| "%llu %llu %lu %llu %llu\n", |
| xprt->stat.bind_count, |
| xprt->stat.connect_count, |
| xprt->stat.connect_time / HZ, |
| idle_time, |
| xprt->stat.sends, |
| xprt->stat.recvs, |
| xprt->stat.bad_xids, |
| xprt->stat.req_u, |
| xprt->stat.bklog_u, |
| xprt->stat.max_slots, |
| xprt->stat.sending_u, |
| xprt->stat.pending_u); |
| } |
| |
| /** |
| * xs_udp_print_stats - display UDP socket-specifc stats |
| * @xprt: rpc_xprt struct containing statistics |
| * @seq: output file |
| * |
| */ |
| static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| |
| seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " |
| "%lu %llu %llu\n", |
| transport->srcport, |
| xprt->stat.bind_count, |
| xprt->stat.sends, |
| xprt->stat.recvs, |
| xprt->stat.bad_xids, |
| xprt->stat.req_u, |
| xprt->stat.bklog_u, |
| xprt->stat.max_slots, |
| xprt->stat.sending_u, |
| xprt->stat.pending_u); |
| } |
| |
| /** |
| * xs_tcp_print_stats - display TCP socket-specifc stats |
| * @xprt: rpc_xprt struct containing statistics |
| * @seq: output file |
| * |
| */ |
| static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
| { |
| struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| long idle_time = 0; |
| |
| if (xprt_connected(xprt)) |
| idle_time = (long)(jiffies - xprt->last_used) / HZ; |
| |
| seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " |
| "%llu %llu %lu %llu %llu\n", |
| transport->srcport, |
| xprt->stat.bind_count, |
| xprt->stat.connect_count, |
| xprt->stat.connect_time / HZ, |
| idle_time, |
| xprt->stat.sends, |
| xprt->stat.recvs, |
| xprt->stat.bad_xids, |
| xprt->stat.req_u, |
| xprt->stat.bklog_u, |
| xprt->stat.max_slots, |
| xprt->stat.sending_u, |
| xprt->stat.pending_u); |
| } |
| |
| /* |
| * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason |
| * we allocate pages instead doing a kmalloc like rpc_malloc is because we want |
| * to use the server side send routines. |
| */ |
| static int bc_malloc(struct rpc_task *task) |
| { |
| struct rpc_rqst *rqst = task->tk_rqstp; |
| size_t size = rqst->rq_callsize; |
| struct page *page; |
| struct rpc_buffer *buf; |
| |
| if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { |
| WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", |
| size); |
| return -EINVAL; |
| } |
| |
| page = alloc_page(GFP_KERNEL); |
| if (!page) |
| return -ENOMEM; |
| |
| buf = page_address(page); |
| buf->len = PAGE_SIZE; |
| |
| rqst->rq_buffer = buf->data; |
| rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; |
| return 0; |
| } |
| |
| /* |
| * Free the space allocated in the bc_alloc routine |
| */ |
| static void bc_free(struct rpc_task *task) |
| { |
| void *buffer = task->tk_rqstp->rq_buffer; |
| struct rpc_buffer *buf; |
| |
| buf = container_of(buffer, struct rpc_buffer, data); |
| free_page((unsigned long)buf); |
| } |
| |
| /* |
| * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex |
| * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. |
| */ |
| static int bc_sendto(struct rpc_rqst *req) |
| { |
| int len; |
| struct xdr_buf *xbufp = &req->rq_snd_buf; |
| struct sock_xprt *transport = |
| container_of(req->rq_xprt, struct sock_xprt, xprt); |
| unsigned long headoff; |
| unsigned long tailoff; |
| struct page *tailpage; |
| struct msghdr msg = { |
| .msg_flags = MSG_MORE |
| }; |
| rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | |
| (u32)xbufp->len); |
| struct kvec iov = { |
| .iov_base = &marker, |
| .iov_len = sizeof(marker), |
| }; |
| |
| len = kernel_sendmsg(transport->sock, &msg, &iov, 1, iov.iov_len); |
| if (len != iov.iov_len) |
| return -EAGAIN; |
| |
| tailpage = NULL; |
| if (xbufp->tail[0].iov_len) |
| tailpage = virt_to_page(xbufp->tail[0].iov_base); |
| tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; |
| headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; |
| len = svc_send_common(transport->sock, xbufp, |
| virt_to_page(xbufp->head[0].iov_base), headoff, |
| tailpage, tailoff); |
| if (len != xbufp->len) |
| return -EAGAIN; |
| return len; |
| } |
| |
| /* |
| * The send routine. Borrows from svc_send |
| */ |
| static int bc_send_request(struct rpc_rqst *req) |
| { |
| struct svc_xprt *xprt; |
| int len; |
| |
| dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); |
| /* |
| * Get the server socket associated with this callback xprt |
| */ |
| xprt = req->rq_xprt->bc_xprt; |
| |
| /* |
| * Grab the mutex to serialize data as the connection is shared |
| * with the fore channel |
| */ |
| mutex_lock(&xprt->xpt_mutex); |
| if (test_bit(XPT_DEAD, &xprt->xpt_flags)) |
| len = -ENOTCONN; |
| else |
| len = bc_sendto(req); |
| mutex_unlock(&xprt->xpt_mutex); |
| |
| if (len > 0) |
| len = 0; |
| |
| return len; |
| } |
| |
| /* |
| * The close routine. Since this is client initiated, we do nothing |
| */ |
| |
| static void bc_close(struct rpc_xprt *xprt) |
| { |
| } |
| |
| /* |
| * The xprt destroy routine. Again, because this connection is client |
| * initiated, we do nothing |
| */ |
| |
| static void bc_destroy(struct rpc_xprt *xprt) |
| { |
| dprintk("RPC: bc_destroy xprt %p\n", xprt); |
| |
| xs_xprt_free(xprt); |
| module_put(THIS_MODULE); |
| } |
| |
| static const struct rpc_xprt_ops xs_local_ops = { |
| .reserve_xprt = xprt_reserve_xprt, |
| .release_xprt = xprt_release_xprt, |
| .alloc_slot = xprt_alloc_slot, |
| .free_slot = xprt_free_slot, |
| .rpcbind = xs_local_rpcbind, |
| .set_port = xs_local_set_port, |
| .connect = xs_local_connect, |
| .buf_alloc = rpc_malloc, |
| .buf_free = rpc_free, |
| .prepare_request = xs_stream_prepare_request, |
| .send_request = xs_local_send_request, |
| .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 const struct rpc_xprt_ops xs_udp_ops = { |
| .set_buffer_size = xs_udp_set_buffer_size, |
| .reserve_xprt = xprt_reserve_xprt_cong, |
| .release_xprt = xprt_release_xprt_cong, |
| .alloc_slot = xprt_alloc_slot, |
| .free_slot = xprt_free_slot, |
| .rpcbind = rpcb_getport_async, |
| .set_port = xs_set_port, |
| .connect = xs_connect, |
| .buf_alloc = rpc_malloc, |
| .buf_free = rpc_free, |
| .send_request = xs_udp_send_request, |
| .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 const struct rpc_xprt_ops xs_tcp_ops = { |
| .reserve_xprt = xprt_reserve_xprt, |
| .release_xprt = xprt_release_xprt, |
| .alloc_slot = xprt_alloc_slot, |
| .free_slot = xprt_free_slot, |
| .rpcbind = rpcb_getport_async, |
| .set_port = xs_set_port, |
| .connect = xs_connect, |
| .buf_alloc = rpc_malloc, |
| .buf_free = rpc_free, |
| .prepare_request = xs_stream_prepare_request, |
| .send_request = xs_tcp_send_request, |
| .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_maxpayload = xs_tcp_bc_maxpayload, |
| .bc_free_rqst = xprt_free_bc_rqst, |
| .bc_destroy = xprt_destroy_bc, |
| #endif |
| }; |
| |
| /* |
| * The rpc_xprt_ops for the server backchannel |
| */ |
| |
| static const struct rpc_xprt_ops bc_tcp_ops = { |
| .reserve_xprt = xprt_reserve_xprt, |
| .release_xprt = xprt_release_xprt, |
| .alloc_slot = xprt_alloc_slot, |
| .free_slot = xprt_free_slot, |
| .buf_alloc = bc_malloc, |
| .buf_free = bc_free, |
| .send_request = bc_send_request, |
| .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->max_payload = RPC_MAX_FRAGMENT_SIZE; |
| |
| xprt->bind_timeout = XS_BIND_TO; |
| xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| xprt->idle_timeout = XS_IDLE_DISC_TO; |
| |
| xprt->ops = &xs_local_ops; |
| xprt->timeout = &xs_local_default_timeout; |
| |
| INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); |
| INIT_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; |
| /* 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->max_payload = RPC_MAX_FRAGMENT_SIZE; |
| |
| xprt->bind_timeout = XS_BIND_TO; |
| xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| xprt->idle_timeout = XS_IDLE_DISC_TO; |
| |
| xprt->ops = &xs_tcp_ops; |
| xprt->timeout = &xs_tcp_default_timeout; |
| |
| xprt->max_reconnect_timeout = xprt->timeout->to_maxval; |
| xprt->connect_timeout = xprt->timeout->to_initval * |
| (xprt->timeout->to_retries + 1); |
| |
| INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); |
| INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); |
| |
| switch (addr->sa_family) { |
| case AF_INET: |
| if (((struct sockaddr_in *)addr)->sin_port != htons(0)) |
| xprt_set_bound(xprt); |
| |
| xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); |
| break; |
| case AF_INET6: |
| if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) |
| xprt_set_bound(xprt); |
| |
| xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); |
| break; |
| default: |
| ret = ERR_PTR(-EAFNOSUPPORT); |
| goto out_err; |
| } |
| |
| if (xprt_bound(xprt)) |
| dprintk("RPC: set up xprt to %s (port %s) via %s\n", |
| xprt->address_strings[RPC_DISPLAY_ADDR], |
| xprt->address_strings[RPC_DISPLAY_PORT], |
| xprt->address_strings[RPC_DISPLAY_PROTO]); |
| else |
| dprintk("RPC: set up xprt to %s (autobind) via %s\n", |
| xprt->address_strings[RPC_DISPLAY_ADDR], |
| xprt->address_strings[RPC_DISPLAY_PROTO]); |
| |
| if (try_module_get(THIS_MODULE)) |
| return xprt; |
| ret = ERR_PTR(-EINVAL); |
| out_err: |
| xs_xprt_free(xprt); |
| return ret; |
| } |
| |
| /** |
| * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket |
| * @args: rpc transport creation arguments |
| * |
| */ |
| static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) |
| { |
| struct sockaddr *addr = args->dstaddr; |
| struct rpc_xprt *xprt; |
| struct sock_xprt *transport; |
| struct svc_sock *bc_sock; |
| struct rpc_xprt *ret; |
| |
| xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, |
| xprt_tcp_slot_table_entries); |
| if (IS_ERR(xprt)) |
| return xprt; |
| transport = container_of(xprt, struct sock_xprt, xprt); |
| |
| xprt->prot = IPPROTO_TCP; |
| xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
| xprt->timeout = &xs_tcp_default_timeout; |
| |
| /* backchannel */ |
| xprt_set_bound(xprt); |
| xprt->bind_timeout = 0; |
| xprt->reestablish_timeout = 0; |
| xprt->idle_timeout = 0; |
| |
| xprt->ops = &bc_tcp_ops; |
| |
| switch (addr->sa_family) { |
| case AF_INET: |
| xs_format_peer_addresses(xprt, |