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![Dan Carpenter](/assets/img/avatar_default.png)
This code is supposed to pass negative "err" values for tracing but it
passes positive values instead. The problem is that the
trace_svcsock_tcp_send() function takes a long but "err" is an int and
"sent" is a u32. The negative is first type promoted to u32 so it
becomes a high positive then it is promoted to long and it stays
positive.
Fix this by casting "err" directly to long.
Fixes: 998024dee1
("SUNRPC: Add more svcsock tracepoints")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
1538 lines
39 KiB
C
1538 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/net/sunrpc/svcsock.c
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*
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* These are the RPC server socket internals.
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*
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* The server scheduling algorithm does not always distribute the load
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* evenly when servicing a single client. May need to modify the
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* svc_xprt_enqueue procedure...
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*
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* TCP support is largely untested and may be a little slow. The problem
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* is that we currently do two separate recvfrom's, one for the 4-byte
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* record length, and the second for the actual record. This could possibly
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* be improved by always reading a minimum size of around 100 bytes and
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* tucking any superfluous bytes away in a temporary store. Still, that
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* leaves write requests out in the rain. An alternative may be to peek at
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* the first skb in the queue, and if it matches the next TCP sequence
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* number, to extract the record marker. Yuck.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/net.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/udp.h>
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#include <linux/tcp.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/file.h>
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#include <linux/freezer.h>
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#include <net/sock.h>
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#include <net/checksum.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/udp.h>
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#include <net/tcp.h>
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#include <net/tcp_states.h>
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#include <linux/uaccess.h>
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#include <linux/highmem.h>
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#include <asm/ioctls.h>
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/msg_prot.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/xprt.h>
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#include <trace/events/sunrpc.h>
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#include "socklib.h"
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#include "sunrpc.h"
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT
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static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
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int flags);
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static int svc_udp_recvfrom(struct svc_rqst *);
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static int svc_udp_sendto(struct svc_rqst *);
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static void svc_sock_detach(struct svc_xprt *);
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static void svc_tcp_sock_detach(struct svc_xprt *);
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static void svc_sock_free(struct svc_xprt *);
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static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
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struct net *, struct sockaddr *,
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int, int);
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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static struct lock_class_key svc_key[2];
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static struct lock_class_key svc_slock_key[2];
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static void svc_reclassify_socket(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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if (WARN_ON_ONCE(!sock_allow_reclassification(sk)))
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return;
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switch (sk->sk_family) {
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case AF_INET:
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sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
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&svc_slock_key[0],
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"sk_xprt.xpt_lock-AF_INET-NFSD",
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&svc_key[0]);
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break;
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case AF_INET6:
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sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
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&svc_slock_key[1],
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"sk_xprt.xpt_lock-AF_INET6-NFSD",
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&svc_key[1]);
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break;
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default:
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BUG();
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}
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}
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#else
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static void svc_reclassify_socket(struct socket *sock)
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{
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}
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#endif
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/**
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* svc_tcp_release_rqst - Release transport-related resources
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* @rqstp: request structure with resources to be released
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*
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*/
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static void svc_tcp_release_rqst(struct svc_rqst *rqstp)
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{
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struct sk_buff *skb = rqstp->rq_xprt_ctxt;
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if (skb) {
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struct svc_sock *svsk =
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container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
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rqstp->rq_xprt_ctxt = NULL;
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skb_free_datagram_locked(svsk->sk_sk, skb);
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}
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}
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/**
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* svc_udp_release_rqst - Release transport-related resources
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* @rqstp: request structure with resources to be released
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*
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*/
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static void svc_udp_release_rqst(struct svc_rqst *rqstp)
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{
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struct sk_buff *skb = rqstp->rq_xprt_ctxt;
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if (skb) {
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rqstp->rq_xprt_ctxt = NULL;
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consume_skb(skb);
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}
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}
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union svc_pktinfo_u {
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struct in_pktinfo pkti;
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struct in6_pktinfo pkti6;
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};
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#define SVC_PKTINFO_SPACE \
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CMSG_SPACE(sizeof(union svc_pktinfo_u))
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static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
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{
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struct svc_sock *svsk =
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container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
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switch (svsk->sk_sk->sk_family) {
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case AF_INET: {
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struct in_pktinfo *pki = CMSG_DATA(cmh);
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cmh->cmsg_level = SOL_IP;
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cmh->cmsg_type = IP_PKTINFO;
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pki->ipi_ifindex = 0;
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pki->ipi_spec_dst.s_addr =
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svc_daddr_in(rqstp)->sin_addr.s_addr;
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cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
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}
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break;
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case AF_INET6: {
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struct in6_pktinfo *pki = CMSG_DATA(cmh);
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struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
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cmh->cmsg_level = SOL_IPV6;
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cmh->cmsg_type = IPV6_PKTINFO;
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pki->ipi6_ifindex = daddr->sin6_scope_id;
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pki->ipi6_addr = daddr->sin6_addr;
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cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
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}
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break;
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}
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}
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static int svc_sock_result_payload(struct svc_rqst *rqstp, unsigned int offset,
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unsigned int length)
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{
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return 0;
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}
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/*
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* Report socket names for nfsdfs
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*/
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static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
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{
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const struct sock *sk = svsk->sk_sk;
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const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
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"udp" : "tcp";
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int len;
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switch (sk->sk_family) {
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case PF_INET:
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len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
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proto_name,
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&inet_sk(sk)->inet_rcv_saddr,
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inet_sk(sk)->inet_num);
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case PF_INET6:
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len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
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proto_name,
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&sk->sk_v6_rcv_saddr,
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inet_sk(sk)->inet_num);
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break;
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#endif
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default:
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len = snprintf(buf, remaining, "*unknown-%d*\n",
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sk->sk_family);
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}
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if (len >= remaining) {
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*buf = '\0';
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return -ENAMETOOLONG;
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}
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return len;
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}
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#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
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static void svc_flush_bvec(const struct bio_vec *bvec, size_t size, size_t seek)
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{
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struct bvec_iter bi = {
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.bi_size = size + seek,
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};
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struct bio_vec bv;
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bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
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for_each_bvec(bv, bvec, bi, bi)
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flush_dcache_page(bv.bv_page);
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}
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#else
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static inline void svc_flush_bvec(const struct bio_vec *bvec, size_t size,
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size_t seek)
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{
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}
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#endif
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/*
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* Read from @rqstp's transport socket. The incoming message fills whole
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* pages in @rqstp's rq_pages array until the last page of the message
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* has been received into a partial page.
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*/
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static ssize_t svc_tcp_read_msg(struct svc_rqst *rqstp, size_t buflen,
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size_t seek)
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{
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struct svc_sock *svsk =
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container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
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struct bio_vec *bvec = rqstp->rq_bvec;
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struct msghdr msg = { NULL };
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unsigned int i;
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ssize_t len;
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size_t t;
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rqstp->rq_xprt_hlen = 0;
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clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
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for (i = 0, t = 0; t < buflen; i++, t += PAGE_SIZE) {
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bvec[i].bv_page = rqstp->rq_pages[i];
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bvec[i].bv_len = PAGE_SIZE;
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bvec[i].bv_offset = 0;
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}
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rqstp->rq_respages = &rqstp->rq_pages[i];
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rqstp->rq_next_page = rqstp->rq_respages + 1;
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iov_iter_bvec(&msg.msg_iter, READ, bvec, i, buflen);
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if (seek) {
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iov_iter_advance(&msg.msg_iter, seek);
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buflen -= seek;
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}
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len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
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if (len > 0)
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svc_flush_bvec(bvec, len, seek);
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/* If we read a full record, then assume there may be more
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* data to read (stream based sockets only!)
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*/
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if (len == buflen)
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set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
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return len;
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}
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/*
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* Set socket snd and rcv buffer lengths
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*/
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static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs)
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{
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unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg;
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struct socket *sock = svsk->sk_sock;
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nreqs = min(nreqs, INT_MAX / 2 / max_mesg);
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lock_sock(sock->sk);
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sock->sk->sk_sndbuf = nreqs * max_mesg * 2;
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sock->sk->sk_rcvbuf = nreqs * max_mesg * 2;
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sock->sk->sk_write_space(sock->sk);
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release_sock(sock->sk);
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}
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static void svc_sock_secure_port(struct svc_rqst *rqstp)
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{
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if (svc_port_is_privileged(svc_addr(rqstp)))
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set_bit(RQ_SECURE, &rqstp->rq_flags);
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else
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clear_bit(RQ_SECURE, &rqstp->rq_flags);
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}
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/*
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* INET callback when data has been received on the socket.
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*/
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static void svc_data_ready(struct sock *sk)
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{
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struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
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if (svsk) {
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/* Refer to svc_setup_socket() for details. */
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rmb();
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svsk->sk_odata(sk);
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trace_svcsock_data_ready(&svsk->sk_xprt, 0);
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if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
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svc_xprt_enqueue(&svsk->sk_xprt);
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}
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}
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/*
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* INET callback when space is newly available on the socket.
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*/
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static void svc_write_space(struct sock *sk)
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{
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struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
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if (svsk) {
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/* Refer to svc_setup_socket() for details. */
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rmb();
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trace_svcsock_write_space(&svsk->sk_xprt, 0);
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svsk->sk_owspace(sk);
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svc_xprt_enqueue(&svsk->sk_xprt);
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}
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}
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static int svc_tcp_has_wspace(struct svc_xprt *xprt)
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{
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struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
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if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
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return 1;
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return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
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}
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static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
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{
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struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
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sock_no_linger(svsk->sk_sock->sk);
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}
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/*
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* See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
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*/
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static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
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struct cmsghdr *cmh)
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{
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struct in_pktinfo *pki = CMSG_DATA(cmh);
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struct sockaddr_in *daddr = svc_daddr_in(rqstp);
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if (cmh->cmsg_type != IP_PKTINFO)
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return 0;
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daddr->sin_family = AF_INET;
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daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
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return 1;
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}
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/*
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* See net/ipv6/datagram.c : ip6_datagram_recv_ctl
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*/
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static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
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struct cmsghdr *cmh)
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{
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struct in6_pktinfo *pki = CMSG_DATA(cmh);
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struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
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if (cmh->cmsg_type != IPV6_PKTINFO)
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return 0;
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daddr->sin6_family = AF_INET6;
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daddr->sin6_addr = pki->ipi6_addr;
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daddr->sin6_scope_id = pki->ipi6_ifindex;
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return 1;
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}
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|
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/*
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* Copy the UDP datagram's destination address to the rqstp structure.
|
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* The 'destination' address in this case is the address to which the
|
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* peer sent the datagram, i.e. our local address. For multihomed
|
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* hosts, this can change from msg to msg. Note that only the IP
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* address changes, the port number should remain the same.
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*/
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static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
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struct cmsghdr *cmh)
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{
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switch (cmh->cmsg_level) {
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case SOL_IP:
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return svc_udp_get_dest_address4(rqstp, cmh);
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case SOL_IPV6:
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return svc_udp_get_dest_address6(rqstp, cmh);
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}
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|
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return 0;
|
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}
|
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|
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/**
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* svc_udp_recvfrom - Receive a datagram from a UDP socket.
|
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* @rqstp: request structure into which to receive an RPC Call
|
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*
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* Called in a loop when XPT_DATA has been set.
|
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*
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* Returns:
|
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* On success, the number of bytes in a received RPC Call, or
|
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* %0 if a complete RPC Call message was not ready to return
|
|
*/
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static int svc_udp_recvfrom(struct svc_rqst *rqstp)
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{
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struct svc_sock *svsk =
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container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
|
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struct svc_serv *serv = svsk->sk_xprt.xpt_server;
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struct sk_buff *skb;
|
|
union {
|
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struct cmsghdr hdr;
|
|
long all[SVC_PKTINFO_SPACE / sizeof(long)];
|
|
} buffer;
|
|
struct cmsghdr *cmh = &buffer.hdr;
|
|
struct msghdr msg = {
|
|
.msg_name = svc_addr(rqstp),
|
|
.msg_control = cmh,
|
|
.msg_controllen = sizeof(buffer),
|
|
.msg_flags = MSG_DONTWAIT,
|
|
};
|
|
size_t len;
|
|
int err;
|
|
|
|
if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
|
|
/* udp sockets need large rcvbuf as all pending
|
|
* requests are still in that buffer. sndbuf must
|
|
* also be large enough that there is enough space
|
|
* for one reply per thread. We count all threads
|
|
* rather than threads in a particular pool, which
|
|
* provides an upper bound on the number of threads
|
|
* which will access the socket.
|
|
*/
|
|
svc_sock_setbufsize(svsk, serv->sv_nrthreads + 3);
|
|
|
|
clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
|
|
0, 0, MSG_PEEK | MSG_DONTWAIT);
|
|
if (err < 0)
|
|
goto out_recv_err;
|
|
skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err);
|
|
if (!skb)
|
|
goto out_recv_err;
|
|
|
|
len = svc_addr_len(svc_addr(rqstp));
|
|
rqstp->rq_addrlen = len;
|
|
if (skb->tstamp == 0) {
|
|
skb->tstamp = ktime_get_real();
|
|
/* Don't enable netstamp, sunrpc doesn't
|
|
need that much accuracy */
|
|
}
|
|
sock_write_timestamp(svsk->sk_sk, skb->tstamp);
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
|
|
|
|
len = skb->len;
|
|
rqstp->rq_arg.len = len;
|
|
trace_svcsock_udp_recv(&svsk->sk_xprt, len);
|
|
|
|
rqstp->rq_prot = IPPROTO_UDP;
|
|
|
|
if (!svc_udp_get_dest_address(rqstp, cmh))
|
|
goto out_cmsg_err;
|
|
rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp));
|
|
|
|
if (skb_is_nonlinear(skb)) {
|
|
/* we have to copy */
|
|
local_bh_disable();
|
|
if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb))
|
|
goto out_bh_enable;
|
|
local_bh_enable();
|
|
consume_skb(skb);
|
|
} else {
|
|
/* we can use it in-place */
|
|
rqstp->rq_arg.head[0].iov_base = skb->data;
|
|
rqstp->rq_arg.head[0].iov_len = len;
|
|
if (skb_checksum_complete(skb))
|
|
goto out_free;
|
|
rqstp->rq_xprt_ctxt = skb;
|
|
}
|
|
|
|
rqstp->rq_arg.page_base = 0;
|
|
if (len <= rqstp->rq_arg.head[0].iov_len) {
|
|
rqstp->rq_arg.head[0].iov_len = len;
|
|
rqstp->rq_arg.page_len = 0;
|
|
rqstp->rq_respages = rqstp->rq_pages+1;
|
|
} else {
|
|
rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
|
|
rqstp->rq_respages = rqstp->rq_pages + 1 +
|
|
DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE);
|
|
}
|
|
rqstp->rq_next_page = rqstp->rq_respages+1;
|
|
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->netudpcnt++;
|
|
|
|
svc_xprt_received(rqstp->rq_xprt);
|
|
return len;
|
|
|
|
out_recv_err:
|
|
if (err != -EAGAIN) {
|
|
/* possibly an icmp error */
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
}
|
|
trace_svcsock_udp_recv_err(&svsk->sk_xprt, err);
|
|
goto out_clear_busy;
|
|
out_cmsg_err:
|
|
net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
|
|
cmh->cmsg_level, cmh->cmsg_type);
|
|
goto out_free;
|
|
out_bh_enable:
|
|
local_bh_enable();
|
|
out_free:
|
|
kfree_skb(skb);
|
|
out_clear_busy:
|
|
svc_xprt_received(rqstp->rq_xprt);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* svc_udp_sendto - Send out a reply on a UDP socket
|
|
* @rqstp: completed svc_rqst
|
|
*
|
|
* xpt_mutex ensures @rqstp's whole message is written to the socket
|
|
* without interruption.
|
|
*
|
|
* Returns the number of bytes sent, or a negative errno.
|
|
*/
|
|
static int svc_udp_sendto(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_xprt *xprt = rqstp->rq_xprt;
|
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
|
|
struct xdr_buf *xdr = &rqstp->rq_res;
|
|
union {
|
|
struct cmsghdr hdr;
|
|
long all[SVC_PKTINFO_SPACE / sizeof(long)];
|
|
} buffer;
|
|
struct cmsghdr *cmh = &buffer.hdr;
|
|
struct msghdr msg = {
|
|
.msg_name = &rqstp->rq_addr,
|
|
.msg_namelen = rqstp->rq_addrlen,
|
|
.msg_control = cmh,
|
|
.msg_controllen = sizeof(buffer),
|
|
};
|
|
unsigned int sent;
|
|
int err;
|
|
|
|
svc_udp_release_rqst(rqstp);
|
|
|
|
svc_set_cmsg_data(rqstp, cmh);
|
|
|
|
mutex_lock(&xprt->xpt_mutex);
|
|
|
|
if (svc_xprt_is_dead(xprt))
|
|
goto out_notconn;
|
|
|
|
err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
|
|
xdr_free_bvec(xdr);
|
|
if (err == -ECONNREFUSED) {
|
|
/* ICMP error on earlier request. */
|
|
err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent);
|
|
xdr_free_bvec(xdr);
|
|
}
|
|
trace_svcsock_udp_send(xprt, err);
|
|
|
|
mutex_unlock(&xprt->xpt_mutex);
|
|
if (err < 0)
|
|
return err;
|
|
return sent;
|
|
|
|
out_notconn:
|
|
mutex_unlock(&xprt->xpt_mutex);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
static int svc_udp_has_wspace(struct svc_xprt *xprt)
|
|
{
|
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
|
|
struct svc_serv *serv = xprt->xpt_server;
|
|
unsigned long required;
|
|
|
|
/*
|
|
* Set the SOCK_NOSPACE flag before checking the available
|
|
* sock space.
|
|
*/
|
|
set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
|
|
required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg;
|
|
if (required*2 > sock_wspace(svsk->sk_sk))
|
|
return 0;
|
|
clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
|
|
return 1;
|
|
}
|
|
|
|
static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt)
|
|
{
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
|
|
static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt)
|
|
{
|
|
}
|
|
|
|
static struct svc_xprt *svc_udp_create(struct svc_serv *serv,
|
|
struct net *net,
|
|
struct sockaddr *sa, int salen,
|
|
int flags)
|
|
{
|
|
return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags);
|
|
}
|
|
|
|
static const struct svc_xprt_ops svc_udp_ops = {
|
|
.xpo_create = svc_udp_create,
|
|
.xpo_recvfrom = svc_udp_recvfrom,
|
|
.xpo_sendto = svc_udp_sendto,
|
|
.xpo_result_payload = svc_sock_result_payload,
|
|
.xpo_release_rqst = svc_udp_release_rqst,
|
|
.xpo_detach = svc_sock_detach,
|
|
.xpo_free = svc_sock_free,
|
|
.xpo_has_wspace = svc_udp_has_wspace,
|
|
.xpo_accept = svc_udp_accept,
|
|
.xpo_secure_port = svc_sock_secure_port,
|
|
.xpo_kill_temp_xprt = svc_udp_kill_temp_xprt,
|
|
};
|
|
|
|
static struct svc_xprt_class svc_udp_class = {
|
|
.xcl_name = "udp",
|
|
.xcl_owner = THIS_MODULE,
|
|
.xcl_ops = &svc_udp_ops,
|
|
.xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP,
|
|
.xcl_ident = XPRT_TRANSPORT_UDP,
|
|
};
|
|
|
|
static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
|
|
{
|
|
svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
|
|
&svsk->sk_xprt, serv);
|
|
clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
|
|
svsk->sk_sk->sk_data_ready = svc_data_ready;
|
|
svsk->sk_sk->sk_write_space = svc_write_space;
|
|
|
|
/* initialise setting must have enough space to
|
|
* receive and respond to one request.
|
|
* svc_udp_recvfrom will re-adjust if necessary
|
|
*/
|
|
svc_sock_setbufsize(svsk, 3);
|
|
|
|
/* data might have come in before data_ready set up */
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
|
|
|
|
/* make sure we get destination address info */
|
|
switch (svsk->sk_sk->sk_family) {
|
|
case AF_INET:
|
|
ip_sock_set_pktinfo(svsk->sk_sock->sk);
|
|
break;
|
|
case AF_INET6:
|
|
ip6_sock_set_recvpktinfo(svsk->sk_sock->sk);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* A data_ready event on a listening socket means there's a connection
|
|
* pending. Do not use state_change as a substitute for it.
|
|
*/
|
|
static void svc_tcp_listen_data_ready(struct sock *sk)
|
|
{
|
|
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
|
|
|
|
if (svsk) {
|
|
/* Refer to svc_setup_socket() for details. */
|
|
rmb();
|
|
svsk->sk_odata(sk);
|
|
}
|
|
|
|
/*
|
|
* This callback may called twice when a new connection
|
|
* is established as a child socket inherits everything
|
|
* from a parent LISTEN socket.
|
|
* 1) data_ready method of the parent socket will be called
|
|
* when one of child sockets become ESTABLISHED.
|
|
* 2) data_ready method of the child socket may be called
|
|
* when it receives data before the socket is accepted.
|
|
* In case of 2, we should ignore it silently.
|
|
*/
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
if (svsk) {
|
|
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&svsk->sk_xprt);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* A state change on a connected socket means it's dying or dead.
|
|
*/
|
|
static void svc_tcp_state_change(struct sock *sk)
|
|
{
|
|
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
|
|
|
|
if (svsk) {
|
|
/* Refer to svc_setup_socket() for details. */
|
|
rmb();
|
|
svsk->sk_ostate(sk);
|
|
trace_svcsock_tcp_state(&svsk->sk_xprt, svsk->sk_sock);
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
svc_xprt_deferred_close(&svsk->sk_xprt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Accept a TCP connection
|
|
*/
|
|
static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt)
|
|
{
|
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
|
|
struct sockaddr_storage addr;
|
|
struct sockaddr *sin = (struct sockaddr *) &addr;
|
|
struct svc_serv *serv = svsk->sk_xprt.xpt_server;
|
|
struct socket *sock = svsk->sk_sock;
|
|
struct socket *newsock;
|
|
struct svc_sock *newsvsk;
|
|
int err, slen;
|
|
|
|
if (!sock)
|
|
return NULL;
|
|
|
|
clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
|
|
err = kernel_accept(sock, &newsock, O_NONBLOCK);
|
|
if (err < 0) {
|
|
if (err == -ENOMEM)
|
|
printk(KERN_WARNING "%s: no more sockets!\n",
|
|
serv->sv_name);
|
|
else if (err != -EAGAIN)
|
|
net_warn_ratelimited("%s: accept failed (err %d)!\n",
|
|
serv->sv_name, -err);
|
|
trace_svcsock_accept_err(xprt, serv->sv_name, err);
|
|
return NULL;
|
|
}
|
|
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
|
|
|
|
err = kernel_getpeername(newsock, sin);
|
|
if (err < 0) {
|
|
trace_svcsock_getpeername_err(xprt, serv->sv_name, err);
|
|
goto failed; /* aborted connection or whatever */
|
|
}
|
|
slen = err;
|
|
|
|
/* Reset the inherited callbacks before calling svc_setup_socket */
|
|
newsock->sk->sk_state_change = svsk->sk_ostate;
|
|
newsock->sk->sk_data_ready = svsk->sk_odata;
|
|
newsock->sk->sk_write_space = svsk->sk_owspace;
|
|
|
|
/* make sure that a write doesn't block forever when
|
|
* low on memory
|
|
*/
|
|
newsock->sk->sk_sndtimeo = HZ*30;
|
|
|
|
newsvsk = svc_setup_socket(serv, newsock,
|
|
(SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY));
|
|
if (IS_ERR(newsvsk))
|
|
goto failed;
|
|
svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
|
|
err = kernel_getsockname(newsock, sin);
|
|
slen = err;
|
|
if (unlikely(err < 0))
|
|
slen = offsetof(struct sockaddr, sa_data);
|
|
svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
|
|
|
|
if (sock_is_loopback(newsock->sk))
|
|
set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
|
|
else
|
|
clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags);
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->nettcpconn++;
|
|
|
|
return &newsvsk->sk_xprt;
|
|
|
|
failed:
|
|
sock_release(newsock);
|
|
return NULL;
|
|
}
|
|
|
|
static size_t svc_tcp_restore_pages(struct svc_sock *svsk,
|
|
struct svc_rqst *rqstp)
|
|
{
|
|
size_t len = svsk->sk_datalen;
|
|
unsigned int i, npages;
|
|
|
|
if (!len)
|
|
return 0;
|
|
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
for (i = 0; i < npages; i++) {
|
|
if (rqstp->rq_pages[i] != NULL)
|
|
put_page(rqstp->rq_pages[i]);
|
|
BUG_ON(svsk->sk_pages[i] == NULL);
|
|
rqstp->rq_pages[i] = svsk->sk_pages[i];
|
|
svsk->sk_pages[i] = NULL;
|
|
}
|
|
rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]);
|
|
return len;
|
|
}
|
|
|
|
static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
|
|
{
|
|
unsigned int i, len, npages;
|
|
|
|
if (svsk->sk_datalen == 0)
|
|
return;
|
|
len = svsk->sk_datalen;
|
|
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
for (i = 0; i < npages; i++) {
|
|
svsk->sk_pages[i] = rqstp->rq_pages[i];
|
|
rqstp->rq_pages[i] = NULL;
|
|
}
|
|
}
|
|
|
|
static void svc_tcp_clear_pages(struct svc_sock *svsk)
|
|
{
|
|
unsigned int i, len, npages;
|
|
|
|
if (svsk->sk_datalen == 0)
|
|
goto out;
|
|
len = svsk->sk_datalen;
|
|
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
for (i = 0; i < npages; i++) {
|
|
if (svsk->sk_pages[i] == NULL) {
|
|
WARN_ON_ONCE(1);
|
|
continue;
|
|
}
|
|
put_page(svsk->sk_pages[i]);
|
|
svsk->sk_pages[i] = NULL;
|
|
}
|
|
out:
|
|
svsk->sk_tcplen = 0;
|
|
svsk->sk_datalen = 0;
|
|
}
|
|
|
|
/*
|
|
* Receive fragment record header into sk_marker.
|
|
*/
|
|
static ssize_t svc_tcp_read_marker(struct svc_sock *svsk,
|
|
struct svc_rqst *rqstp)
|
|
{
|
|
ssize_t want, len;
|
|
|
|
/* If we haven't gotten the record length yet,
|
|
* get the next four bytes.
|
|
*/
|
|
if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
|
|
struct msghdr msg = { NULL };
|
|
struct kvec iov;
|
|
|
|
want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
|
|
iov.iov_base = ((char *)&svsk->sk_marker) + svsk->sk_tcplen;
|
|
iov.iov_len = want;
|
|
iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, want);
|
|
len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT);
|
|
if (len < 0)
|
|
return len;
|
|
svsk->sk_tcplen += len;
|
|
if (len < want) {
|
|
/* call again to read the remaining bytes */
|
|
goto err_short;
|
|
}
|
|
trace_svcsock_marker(&svsk->sk_xprt, svsk->sk_marker);
|
|
if (svc_sock_reclen(svsk) + svsk->sk_datalen >
|
|
svsk->sk_xprt.xpt_server->sv_max_mesg)
|
|
goto err_too_large;
|
|
}
|
|
return svc_sock_reclen(svsk);
|
|
|
|
err_too_large:
|
|
net_notice_ratelimited("svc: %s %s RPC fragment too large: %d\n",
|
|
__func__, svsk->sk_xprt.xpt_server->sv_name,
|
|
svc_sock_reclen(svsk));
|
|
svc_xprt_deferred_close(&svsk->sk_xprt);
|
|
err_short:
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp)
|
|
{
|
|
struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt;
|
|
struct rpc_rqst *req = NULL;
|
|
struct kvec *src, *dst;
|
|
__be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
|
|
__be32 xid;
|
|
__be32 calldir;
|
|
|
|
xid = *p++;
|
|
calldir = *p;
|
|
|
|
if (!bc_xprt)
|
|
return -EAGAIN;
|
|
spin_lock(&bc_xprt->queue_lock);
|
|
req = xprt_lookup_rqst(bc_xprt, xid);
|
|
if (!req)
|
|
goto unlock_notfound;
|
|
|
|
memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf));
|
|
/*
|
|
* XXX!: cheating for now! Only copying HEAD.
|
|
* But we know this is good enough for now (in fact, for any
|
|
* callback reply in the forseeable future).
|
|
*/
|
|
dst = &req->rq_private_buf.head[0];
|
|
src = &rqstp->rq_arg.head[0];
|
|
if (dst->iov_len < src->iov_len)
|
|
goto unlock_eagain; /* whatever; just giving up. */
|
|
memcpy(dst->iov_base, src->iov_base, src->iov_len);
|
|
xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len);
|
|
rqstp->rq_arg.len = 0;
|
|
spin_unlock(&bc_xprt->queue_lock);
|
|
return 0;
|
|
unlock_notfound:
|
|
printk(KERN_NOTICE
|
|
"%s: Got unrecognized reply: "
|
|
"calldir 0x%x xpt_bc_xprt %p xid %08x\n",
|
|
__func__, ntohl(calldir),
|
|
bc_xprt, ntohl(xid));
|
|
unlock_eagain:
|
|
spin_unlock(&bc_xprt->queue_lock);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static void svc_tcp_fragment_received(struct svc_sock *svsk)
|
|
{
|
|
/* If we have more data, signal svc_xprt_enqueue() to try again */
|
|
svsk->sk_tcplen = 0;
|
|
svsk->sk_marker = xdr_zero;
|
|
}
|
|
|
|
/**
|
|
* svc_tcp_recvfrom - Receive data from a TCP socket
|
|
* @rqstp: request structure into which to receive an RPC Call
|
|
*
|
|
* Called in a loop when XPT_DATA has been set.
|
|
*
|
|
* Read the 4-byte stream record marker, then use the record length
|
|
* in that marker to set up exactly the resources needed to receive
|
|
* the next RPC message into @rqstp.
|
|
*
|
|
* Returns:
|
|
* On success, the number of bytes in a received RPC Call, or
|
|
* %0 if a complete RPC Call message was not ready to return
|
|
*
|
|
* The zero return case handles partial receives and callback Replies.
|
|
* The state of a partial receive is preserved in the svc_sock for
|
|
* the next call to svc_tcp_recvfrom.
|
|
*/
|
|
static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_sock *svsk =
|
|
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
|
|
struct svc_serv *serv = svsk->sk_xprt.xpt_server;
|
|
size_t want, base;
|
|
ssize_t len;
|
|
__be32 *p;
|
|
__be32 calldir;
|
|
|
|
clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
len = svc_tcp_read_marker(svsk, rqstp);
|
|
if (len < 0)
|
|
goto error;
|
|
|
|
base = svc_tcp_restore_pages(svsk, rqstp);
|
|
want = len - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
|
|
len = svc_tcp_read_msg(rqstp, base + want, base);
|
|
if (len >= 0) {
|
|
trace_svcsock_tcp_recv(&svsk->sk_xprt, len);
|
|
svsk->sk_tcplen += len;
|
|
svsk->sk_datalen += len;
|
|
}
|
|
if (len != want || !svc_sock_final_rec(svsk))
|
|
goto err_incomplete;
|
|
if (svsk->sk_datalen < 8)
|
|
goto err_nuts;
|
|
|
|
rqstp->rq_arg.len = svsk->sk_datalen;
|
|
rqstp->rq_arg.page_base = 0;
|
|
if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) {
|
|
rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len;
|
|
rqstp->rq_arg.page_len = 0;
|
|
} else
|
|
rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
|
|
|
|
rqstp->rq_xprt_ctxt = NULL;
|
|
rqstp->rq_prot = IPPROTO_TCP;
|
|
if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags))
|
|
set_bit(RQ_LOCAL, &rqstp->rq_flags);
|
|
else
|
|
clear_bit(RQ_LOCAL, &rqstp->rq_flags);
|
|
|
|
p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
|
|
calldir = p[1];
|
|
if (calldir)
|
|
len = receive_cb_reply(svsk, rqstp);
|
|
|
|
/* Reset TCP read info */
|
|
svsk->sk_datalen = 0;
|
|
svc_tcp_fragment_received(svsk);
|
|
|
|
if (len < 0)
|
|
goto error;
|
|
|
|
svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->nettcpcnt++;
|
|
|
|
svc_xprt_received(rqstp->rq_xprt);
|
|
return rqstp->rq_arg.len;
|
|
|
|
err_incomplete:
|
|
svc_tcp_save_pages(svsk, rqstp);
|
|
if (len < 0 && len != -EAGAIN)
|
|
goto err_delete;
|
|
if (len == want)
|
|
svc_tcp_fragment_received(svsk);
|
|
else
|
|
trace_svcsock_tcp_recv_short(&svsk->sk_xprt,
|
|
svc_sock_reclen(svsk),
|
|
svsk->sk_tcplen - sizeof(rpc_fraghdr));
|
|
goto err_noclose;
|
|
error:
|
|
if (len != -EAGAIN)
|
|
goto err_delete;
|
|
trace_svcsock_tcp_recv_eagain(&svsk->sk_xprt, 0);
|
|
goto err_noclose;
|
|
err_nuts:
|
|
svsk->sk_datalen = 0;
|
|
err_delete:
|
|
trace_svcsock_tcp_recv_err(&svsk->sk_xprt, len);
|
|
svc_xprt_deferred_close(&svsk->sk_xprt);
|
|
err_noclose:
|
|
svc_xprt_received(rqstp->rq_xprt);
|
|
return 0; /* record not complete */
|
|
}
|
|
|
|
static int svc_tcp_send_kvec(struct socket *sock, const struct kvec *vec,
|
|
int flags)
|
|
{
|
|
return kernel_sendpage(sock, virt_to_page(vec->iov_base),
|
|
offset_in_page(vec->iov_base),
|
|
vec->iov_len, flags);
|
|
}
|
|
|
|
/*
|
|
* kernel_sendpage() is used exclusively to reduce the number of
|
|
* copy operations in this path. Therefore the caller must ensure
|
|
* that the pages backing @xdr are unchanging.
|
|
*
|
|
* In addition, the logic assumes that * .bv_len is never larger
|
|
* than PAGE_SIZE.
|
|
*/
|
|
static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr,
|
|
rpc_fraghdr marker, unsigned int *sentp)
|
|
{
|
|
const struct kvec *head = xdr->head;
|
|
const struct kvec *tail = xdr->tail;
|
|
struct kvec rm = {
|
|
.iov_base = &marker,
|
|
.iov_len = sizeof(marker),
|
|
};
|
|
struct msghdr msg = {
|
|
.msg_flags = 0,
|
|
};
|
|
int ret;
|
|
|
|
*sentp = 0;
|
|
xdr_alloc_bvec(xdr, GFP_KERNEL);
|
|
|
|
ret = kernel_sendmsg(sock, &msg, &rm, 1, rm.iov_len);
|
|
if (ret < 0)
|
|
return ret;
|
|
*sentp += ret;
|
|
if (ret != rm.iov_len)
|
|
return -EAGAIN;
|
|
|
|
ret = svc_tcp_send_kvec(sock, head, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
*sentp += ret;
|
|
if (ret != head->iov_len)
|
|
goto out;
|
|
|
|
if (xdr->page_len) {
|
|
unsigned int offset, len, remaining;
|
|
struct bio_vec *bvec;
|
|
|
|
bvec = xdr->bvec + (xdr->page_base >> PAGE_SHIFT);
|
|
offset = offset_in_page(xdr->page_base);
|
|
remaining = xdr->page_len;
|
|
while (remaining > 0) {
|
|
len = min(remaining, bvec->bv_len - offset);
|
|
ret = kernel_sendpage(sock, bvec->bv_page,
|
|
bvec->bv_offset + offset,
|
|
len, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
*sentp += ret;
|
|
if (ret != len)
|
|
goto out;
|
|
remaining -= len;
|
|
offset = 0;
|
|
bvec++;
|
|
}
|
|
}
|
|
|
|
if (tail->iov_len) {
|
|
ret = svc_tcp_send_kvec(sock, tail, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
*sentp += ret;
|
|
}
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* svc_tcp_sendto - Send out a reply on a TCP socket
|
|
* @rqstp: completed svc_rqst
|
|
*
|
|
* xpt_mutex ensures @rqstp's whole message is written to the socket
|
|
* without interruption.
|
|
*
|
|
* Returns the number of bytes sent, or a negative errno.
|
|
*/
|
|
static int svc_tcp_sendto(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_xprt *xprt = rqstp->rq_xprt;
|
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
|
|
struct xdr_buf *xdr = &rqstp->rq_res;
|
|
rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
|
|
(u32)xdr->len);
|
|
unsigned int sent;
|
|
int err;
|
|
|
|
svc_tcp_release_rqst(rqstp);
|
|
|
|
atomic_inc(&svsk->sk_sendqlen);
|
|
mutex_lock(&xprt->xpt_mutex);
|
|
if (svc_xprt_is_dead(xprt))
|
|
goto out_notconn;
|
|
tcp_sock_set_cork(svsk->sk_sk, true);
|
|
err = svc_tcp_sendmsg(svsk->sk_sock, xdr, marker, &sent);
|
|
xdr_free_bvec(xdr);
|
|
trace_svcsock_tcp_send(xprt, err < 0 ? (long)err : sent);
|
|
if (err < 0 || sent != (xdr->len + sizeof(marker)))
|
|
goto out_close;
|
|
if (atomic_dec_and_test(&svsk->sk_sendqlen))
|
|
tcp_sock_set_cork(svsk->sk_sk, false);
|
|
mutex_unlock(&xprt->xpt_mutex);
|
|
return sent;
|
|
|
|
out_notconn:
|
|
atomic_dec(&svsk->sk_sendqlen);
|
|
mutex_unlock(&xprt->xpt_mutex);
|
|
return -ENOTCONN;
|
|
out_close:
|
|
pr_notice("rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n",
|
|
xprt->xpt_server->sv_name,
|
|
(err < 0) ? "got error" : "sent",
|
|
(err < 0) ? err : sent, xdr->len);
|
|
svc_xprt_deferred_close(xprt);
|
|
atomic_dec(&svsk->sk_sendqlen);
|
|
mutex_unlock(&xprt->xpt_mutex);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static struct svc_xprt *svc_tcp_create(struct svc_serv *serv,
|
|
struct net *net,
|
|
struct sockaddr *sa, int salen,
|
|
int flags)
|
|
{
|
|
return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
|
|
}
|
|
|
|
static const struct svc_xprt_ops svc_tcp_ops = {
|
|
.xpo_create = svc_tcp_create,
|
|
.xpo_recvfrom = svc_tcp_recvfrom,
|
|
.xpo_sendto = svc_tcp_sendto,
|
|
.xpo_result_payload = svc_sock_result_payload,
|
|
.xpo_release_rqst = svc_tcp_release_rqst,
|
|
.xpo_detach = svc_tcp_sock_detach,
|
|
.xpo_free = svc_sock_free,
|
|
.xpo_has_wspace = svc_tcp_has_wspace,
|
|
.xpo_accept = svc_tcp_accept,
|
|
.xpo_secure_port = svc_sock_secure_port,
|
|
.xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
|
|
};
|
|
|
|
static struct svc_xprt_class svc_tcp_class = {
|
|
.xcl_name = "tcp",
|
|
.xcl_owner = THIS_MODULE,
|
|
.xcl_ops = &svc_tcp_ops,
|
|
.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
|
|
.xcl_ident = XPRT_TRANSPORT_TCP,
|
|
};
|
|
|
|
void svc_init_xprt_sock(void)
|
|
{
|
|
svc_reg_xprt_class(&svc_tcp_class);
|
|
svc_reg_xprt_class(&svc_udp_class);
|
|
}
|
|
|
|
void svc_cleanup_xprt_sock(void)
|
|
{
|
|
svc_unreg_xprt_class(&svc_tcp_class);
|
|
svc_unreg_xprt_class(&svc_udp_class);
|
|
}
|
|
|
|
static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
|
|
{
|
|
struct sock *sk = svsk->sk_sk;
|
|
|
|
svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
|
|
&svsk->sk_xprt, serv);
|
|
set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
|
|
set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags);
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
strcpy(svsk->sk_xprt.xpt_remotebuf, "listener");
|
|
set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags);
|
|
sk->sk_data_ready = svc_tcp_listen_data_ready;
|
|
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
|
|
} else {
|
|
sk->sk_state_change = svc_tcp_state_change;
|
|
sk->sk_data_ready = svc_data_ready;
|
|
sk->sk_write_space = svc_write_space;
|
|
|
|
svsk->sk_marker = xdr_zero;
|
|
svsk->sk_tcplen = 0;
|
|
svsk->sk_datalen = 0;
|
|
memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
|
|
|
|
tcp_sock_set_nodelay(sk);
|
|
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
switch (sk->sk_state) {
|
|
case TCP_SYN_RECV:
|
|
case TCP_ESTABLISHED:
|
|
break;
|
|
default:
|
|
svc_xprt_deferred_close(&svsk->sk_xprt);
|
|
}
|
|
}
|
|
}
|
|
|
|
void svc_sock_update_bufs(struct svc_serv *serv)
|
|
{
|
|
/*
|
|
* The number of server threads has changed. Update
|
|
* rcvbuf and sndbuf accordingly on all sockets
|
|
*/
|
|
struct svc_sock *svsk;
|
|
|
|
spin_lock_bh(&serv->sv_lock);
|
|
list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list)
|
|
set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_sock_update_bufs);
|
|
|
|
/*
|
|
* Initialize socket for RPC use and create svc_sock struct
|
|
*/
|
|
static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
|
|
struct socket *sock,
|
|
int flags)
|
|
{
|
|
struct svc_sock *svsk;
|
|
struct sock *inet;
|
|
int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
|
|
int err = 0;
|
|
|
|
svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
|
|
if (!svsk)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
inet = sock->sk;
|
|
|
|
/* Register socket with portmapper */
|
|
if (pmap_register)
|
|
err = svc_register(serv, sock_net(sock->sk), inet->sk_family,
|
|
inet->sk_protocol,
|
|
ntohs(inet_sk(inet)->inet_sport));
|
|
|
|
if (err < 0) {
|
|
kfree(svsk);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
svsk->sk_sock = sock;
|
|
svsk->sk_sk = inet;
|
|
svsk->sk_ostate = inet->sk_state_change;
|
|
svsk->sk_odata = inet->sk_data_ready;
|
|
svsk->sk_owspace = inet->sk_write_space;
|
|
/*
|
|
* This barrier is necessary in order to prevent race condition
|
|
* with svc_data_ready(), svc_listen_data_ready() and others
|
|
* when calling callbacks above.
|
|
*/
|
|
wmb();
|
|
inet->sk_user_data = svsk;
|
|
|
|
/* Initialize the socket */
|
|
if (sock->type == SOCK_DGRAM)
|
|
svc_udp_init(svsk, serv);
|
|
else
|
|
svc_tcp_init(svsk, serv);
|
|
|
|
trace_svcsock_new_socket(sock);
|
|
return svsk;
|
|
}
|
|
|
|
bool svc_alien_sock(struct net *net, int fd)
|
|
{
|
|
int err;
|
|
struct socket *sock = sockfd_lookup(fd, &err);
|
|
bool ret = false;
|
|
|
|
if (!sock)
|
|
goto out;
|
|
if (sock_net(sock->sk) != net)
|
|
ret = true;
|
|
sockfd_put(sock);
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_alien_sock);
|
|
|
|
/**
|
|
* svc_addsock - add a listener socket to an RPC service
|
|
* @serv: pointer to RPC service to which to add a new listener
|
|
* @fd: file descriptor of the new listener
|
|
* @name_return: pointer to buffer to fill in with name of listener
|
|
* @len: size of the buffer
|
|
* @cred: credential
|
|
*
|
|
* Fills in socket name and returns positive length of name if successful.
|
|
* Name is terminated with '\n'. On error, returns a negative errno
|
|
* value.
|
|
*/
|
|
int svc_addsock(struct svc_serv *serv, const int fd, char *name_return,
|
|
const size_t len, const struct cred *cred)
|
|
{
|
|
int err = 0;
|
|
struct socket *so = sockfd_lookup(fd, &err);
|
|
struct svc_sock *svsk = NULL;
|
|
struct sockaddr_storage addr;
|
|
struct sockaddr *sin = (struct sockaddr *)&addr;
|
|
int salen;
|
|
|
|
if (!so)
|
|
return err;
|
|
err = -EAFNOSUPPORT;
|
|
if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
|
|
goto out;
|
|
err = -EPROTONOSUPPORT;
|
|
if (so->sk->sk_protocol != IPPROTO_TCP &&
|
|
so->sk->sk_protocol != IPPROTO_UDP)
|
|
goto out;
|
|
err = -EISCONN;
|
|
if (so->state > SS_UNCONNECTED)
|
|
goto out;
|
|
err = -ENOENT;
|
|
if (!try_module_get(THIS_MODULE))
|
|
goto out;
|
|
svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS);
|
|
if (IS_ERR(svsk)) {
|
|
module_put(THIS_MODULE);
|
|
err = PTR_ERR(svsk);
|
|
goto out;
|
|
}
|
|
salen = kernel_getsockname(svsk->sk_sock, sin);
|
|
if (salen >= 0)
|
|
svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
|
|
svsk->sk_xprt.xpt_cred = get_cred(cred);
|
|
svc_add_new_perm_xprt(serv, &svsk->sk_xprt);
|
|
return svc_one_sock_name(svsk, name_return, len);
|
|
out:
|
|
sockfd_put(so);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_addsock);
|
|
|
|
/*
|
|
* Create socket for RPC service.
|
|
*/
|
|
static struct svc_xprt *svc_create_socket(struct svc_serv *serv,
|
|
int protocol,
|
|
struct net *net,
|
|
struct sockaddr *sin, int len,
|
|
int flags)
|
|
{
|
|
struct svc_sock *svsk;
|
|
struct socket *sock;
|
|
int error;
|
|
int type;
|
|
struct sockaddr_storage addr;
|
|
struct sockaddr *newsin = (struct sockaddr *)&addr;
|
|
int newlen;
|
|
int family;
|
|
|
|
if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
|
|
printk(KERN_WARNING "svc: only UDP and TCP "
|
|
"sockets supported\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
|
|
switch (sin->sa_family) {
|
|
case AF_INET6:
|
|
family = PF_INET6;
|
|
break;
|
|
case AF_INET:
|
|
family = PF_INET;
|
|
break;
|
|
default:
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
error = __sock_create(net, family, type, protocol, &sock, 1);
|
|
if (error < 0)
|
|
return ERR_PTR(error);
|
|
|
|
svc_reclassify_socket(sock);
|
|
|
|
/*
|
|
* If this is an PF_INET6 listener, we want to avoid
|
|
* getting requests from IPv4 remotes. Those should
|
|
* be shunted to a PF_INET listener via rpcbind.
|
|
*/
|
|
if (family == PF_INET6)
|
|
ip6_sock_set_v6only(sock->sk);
|
|
if (type == SOCK_STREAM)
|
|
sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */
|
|
error = kernel_bind(sock, sin, len);
|
|
if (error < 0)
|
|
goto bummer;
|
|
|
|
error = kernel_getsockname(sock, newsin);
|
|
if (error < 0)
|
|
goto bummer;
|
|
newlen = error;
|
|
|
|
if (protocol == IPPROTO_TCP) {
|
|
if ((error = kernel_listen(sock, 64)) < 0)
|
|
goto bummer;
|
|
}
|
|
|
|
svsk = svc_setup_socket(serv, sock, flags);
|
|
if (IS_ERR(svsk)) {
|
|
error = PTR_ERR(svsk);
|
|
goto bummer;
|
|
}
|
|
svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
|
|
return (struct svc_xprt *)svsk;
|
|
bummer:
|
|
sock_release(sock);
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/*
|
|
* Detach the svc_sock from the socket so that no
|
|
* more callbacks occur.
|
|
*/
|
|
static void svc_sock_detach(struct svc_xprt *xprt)
|
|
{
|
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
|
|
struct sock *sk = svsk->sk_sk;
|
|
|
|
/* put back the old socket callbacks */
|
|
lock_sock(sk);
|
|
sk->sk_state_change = svsk->sk_ostate;
|
|
sk->sk_data_ready = svsk->sk_odata;
|
|
sk->sk_write_space = svsk->sk_owspace;
|
|
sk->sk_user_data = NULL;
|
|
release_sock(sk);
|
|
}
|
|
|
|
/*
|
|
* Disconnect the socket, and reset the callbacks
|
|
*/
|
|
static void svc_tcp_sock_detach(struct svc_xprt *xprt)
|
|
{
|
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
|
|
|
|
svc_sock_detach(xprt);
|
|
|
|
if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) {
|
|
svc_tcp_clear_pages(svsk);
|
|
kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free the svc_sock's socket resources and the svc_sock itself.
|
|
*/
|
|
static void svc_sock_free(struct svc_xprt *xprt)
|
|
{
|
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
|
|
|
|
if (svsk->sk_sock->file)
|
|
sockfd_put(svsk->sk_sock);
|
|
else
|
|
sock_release(svsk->sk_sock);
|
|
kfree(svsk);
|
|
}
|