![Ingo Molnar](/assets/img/avatar_default.png)
Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1580 lines
40 KiB
C
1580 lines
40 KiB
C
/*
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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_sock_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/sched.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 <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/tcp_states.h>
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#include <asm/uaccess.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/xdr.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/stats.h>
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/* SMP locking strategy:
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*
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* svc_serv->sv_lock protects most stuff for that service.
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*
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* Some flags can be set to certain values at any time
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* providing that certain rules are followed:
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*
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* SK_BUSY can be set to 0 at any time.
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* svc_sock_enqueue must be called afterwards
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* SK_CONN, SK_DATA, can be set or cleared at any time.
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* after a set, svc_sock_enqueue must be called.
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* after a clear, the socket must be read/accepted
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* if this succeeds, it must be set again.
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* SK_CLOSE can set at any time. It is never cleared.
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*
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*/
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#define RPCDBG_FACILITY RPCDBG_SVCSOCK
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static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
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int *errp, int pmap_reg);
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static void svc_udp_data_ready(struct sock *, int);
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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 struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk);
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static int svc_deferred_recv(struct svc_rqst *rqstp);
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static struct cache_deferred_req *svc_defer(struct cache_req *req);
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/*
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* Queue up an idle server thread. Must have serv->sv_lock held.
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* Note: this is really a stack rather than a queue, so that we only
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* use as many different threads as we need, and the rest don't polute
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* the cache.
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*/
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static inline void
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svc_serv_enqueue(struct svc_serv *serv, struct svc_rqst *rqstp)
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{
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list_add(&rqstp->rq_list, &serv->sv_threads);
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}
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/*
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* Dequeue an nfsd thread. Must have serv->sv_lock held.
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*/
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static inline void
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svc_serv_dequeue(struct svc_serv *serv, struct svc_rqst *rqstp)
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{
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list_del(&rqstp->rq_list);
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}
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/*
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* Release an skbuff after use
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*/
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static inline void
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svc_release_skb(struct svc_rqst *rqstp)
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{
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struct sk_buff *skb = rqstp->rq_skbuff;
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struct svc_deferred_req *dr = rqstp->rq_deferred;
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if (skb) {
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rqstp->rq_skbuff = NULL;
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dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
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skb_free_datagram(rqstp->rq_sock->sk_sk, skb);
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}
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if (dr) {
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rqstp->rq_deferred = NULL;
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kfree(dr);
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}
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}
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/*
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* Any space to write?
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*/
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static inline unsigned long
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svc_sock_wspace(struct svc_sock *svsk)
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{
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int wspace;
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if (svsk->sk_sock->type == SOCK_STREAM)
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wspace = sk_stream_wspace(svsk->sk_sk);
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else
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wspace = sock_wspace(svsk->sk_sk);
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return wspace;
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}
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/*
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* Queue up a socket with data pending. If there are idle nfsd
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* processes, wake 'em up.
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*
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*/
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static void
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svc_sock_enqueue(struct svc_sock *svsk)
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{
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struct svc_serv *serv = svsk->sk_server;
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struct svc_rqst *rqstp;
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if (!(svsk->sk_flags &
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( (1<<SK_CONN)|(1<<SK_DATA)|(1<<SK_CLOSE)|(1<<SK_DEFERRED)) ))
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return;
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if (test_bit(SK_DEAD, &svsk->sk_flags))
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return;
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spin_lock_bh(&serv->sv_lock);
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if (!list_empty(&serv->sv_threads) &&
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!list_empty(&serv->sv_sockets))
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printk(KERN_ERR
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"svc_sock_enqueue: threads and sockets both waiting??\n");
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if (test_bit(SK_DEAD, &svsk->sk_flags)) {
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/* Don't enqueue dead sockets */
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dprintk("svc: socket %p is dead, not enqueued\n", svsk->sk_sk);
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goto out_unlock;
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}
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if (test_bit(SK_BUSY, &svsk->sk_flags)) {
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/* Don't enqueue socket while daemon is receiving */
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dprintk("svc: socket %p busy, not enqueued\n", svsk->sk_sk);
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goto out_unlock;
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}
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set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
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if (((svsk->sk_reserved + serv->sv_bufsz)*2
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> svc_sock_wspace(svsk))
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&& !test_bit(SK_CLOSE, &svsk->sk_flags)
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&& !test_bit(SK_CONN, &svsk->sk_flags)) {
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/* Don't enqueue while not enough space for reply */
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dprintk("svc: socket %p no space, %d*2 > %ld, not enqueued\n",
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svsk->sk_sk, svsk->sk_reserved+serv->sv_bufsz,
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svc_sock_wspace(svsk));
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goto out_unlock;
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}
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clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
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/* Mark socket as busy. It will remain in this state until the
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* server has processed all pending data and put the socket back
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* on the idle list.
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*/
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set_bit(SK_BUSY, &svsk->sk_flags);
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if (!list_empty(&serv->sv_threads)) {
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rqstp = list_entry(serv->sv_threads.next,
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struct svc_rqst,
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rq_list);
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dprintk("svc: socket %p served by daemon %p\n",
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svsk->sk_sk, rqstp);
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svc_serv_dequeue(serv, rqstp);
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if (rqstp->rq_sock)
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printk(KERN_ERR
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"svc_sock_enqueue: server %p, rq_sock=%p!\n",
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rqstp, rqstp->rq_sock);
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rqstp->rq_sock = svsk;
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svsk->sk_inuse++;
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rqstp->rq_reserved = serv->sv_bufsz;
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svsk->sk_reserved += rqstp->rq_reserved;
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wake_up(&rqstp->rq_wait);
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} else {
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dprintk("svc: socket %p put into queue\n", svsk->sk_sk);
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list_add_tail(&svsk->sk_ready, &serv->sv_sockets);
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}
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out_unlock:
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spin_unlock_bh(&serv->sv_lock);
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}
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/*
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* Dequeue the first socket. Must be called with the serv->sv_lock held.
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*/
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static inline struct svc_sock *
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svc_sock_dequeue(struct svc_serv *serv)
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{
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struct svc_sock *svsk;
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if (list_empty(&serv->sv_sockets))
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return NULL;
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svsk = list_entry(serv->sv_sockets.next,
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struct svc_sock, sk_ready);
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list_del_init(&svsk->sk_ready);
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dprintk("svc: socket %p dequeued, inuse=%d\n",
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svsk->sk_sk, svsk->sk_inuse);
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return svsk;
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}
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/*
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* Having read something from a socket, check whether it
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* needs to be re-enqueued.
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* Note: SK_DATA only gets cleared when a read-attempt finds
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* no (or insufficient) data.
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*/
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static inline void
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svc_sock_received(struct svc_sock *svsk)
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{
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clear_bit(SK_BUSY, &svsk->sk_flags);
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svc_sock_enqueue(svsk);
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}
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/**
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* svc_reserve - change the space reserved for the reply to a request.
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* @rqstp: The request in question
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* @space: new max space to reserve
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*
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* Each request reserves some space on the output queue of the socket
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* to make sure the reply fits. This function reduces that reserved
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* space to be the amount of space used already, plus @space.
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*
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*/
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void svc_reserve(struct svc_rqst *rqstp, int space)
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{
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space += rqstp->rq_res.head[0].iov_len;
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if (space < rqstp->rq_reserved) {
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struct svc_sock *svsk = rqstp->rq_sock;
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spin_lock_bh(&svsk->sk_server->sv_lock);
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svsk->sk_reserved -= (rqstp->rq_reserved - space);
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rqstp->rq_reserved = space;
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spin_unlock_bh(&svsk->sk_server->sv_lock);
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svc_sock_enqueue(svsk);
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}
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}
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/*
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* Release a socket after use.
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*/
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static inline void
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svc_sock_put(struct svc_sock *svsk)
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{
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struct svc_serv *serv = svsk->sk_server;
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spin_lock_bh(&serv->sv_lock);
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if (!--(svsk->sk_inuse) && test_bit(SK_DEAD, &svsk->sk_flags)) {
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spin_unlock_bh(&serv->sv_lock);
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dprintk("svc: releasing dead socket\n");
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sock_release(svsk->sk_sock);
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kfree(svsk);
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}
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else
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spin_unlock_bh(&serv->sv_lock);
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}
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static void
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svc_sock_release(struct svc_rqst *rqstp)
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{
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struct svc_sock *svsk = rqstp->rq_sock;
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svc_release_skb(rqstp);
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svc_free_allpages(rqstp);
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rqstp->rq_res.page_len = 0;
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rqstp->rq_res.page_base = 0;
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|
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/* Reset response buffer and release
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* the reservation.
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* But first, check that enough space was reserved
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* for the reply, otherwise we have a bug!
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*/
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if ((rqstp->rq_res.len) > rqstp->rq_reserved)
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printk(KERN_ERR "RPC request reserved %d but used %d\n",
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rqstp->rq_reserved,
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rqstp->rq_res.len);
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rqstp->rq_res.head[0].iov_len = 0;
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svc_reserve(rqstp, 0);
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rqstp->rq_sock = NULL;
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svc_sock_put(svsk);
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}
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/*
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* External function to wake up a server waiting for data
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*/
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void
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svc_wake_up(struct svc_serv *serv)
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{
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struct svc_rqst *rqstp;
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spin_lock_bh(&serv->sv_lock);
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if (!list_empty(&serv->sv_threads)) {
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rqstp = list_entry(serv->sv_threads.next,
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struct svc_rqst,
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rq_list);
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dprintk("svc: daemon %p woken up.\n", rqstp);
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/*
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svc_serv_dequeue(serv, rqstp);
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rqstp->rq_sock = NULL;
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*/
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wake_up(&rqstp->rq_wait);
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}
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spin_unlock_bh(&serv->sv_lock);
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}
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/*
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* Generic sendto routine
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*/
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static int
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svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
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{
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struct svc_sock *svsk = rqstp->rq_sock;
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struct socket *sock = svsk->sk_sock;
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int slen;
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char buffer[CMSG_SPACE(sizeof(struct in_pktinfo))];
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struct cmsghdr *cmh = (struct cmsghdr *)buffer;
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struct in_pktinfo *pki = (struct in_pktinfo *)CMSG_DATA(cmh);
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int len = 0;
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int result;
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int size;
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struct page **ppage = xdr->pages;
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size_t base = xdr->page_base;
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unsigned int pglen = xdr->page_len;
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unsigned int flags = MSG_MORE;
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slen = xdr->len;
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if (rqstp->rq_prot == IPPROTO_UDP) {
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/* set the source and destination */
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struct msghdr msg;
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msg.msg_name = &rqstp->rq_addr;
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msg.msg_namelen = sizeof(rqstp->rq_addr);
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msg.msg_iov = NULL;
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msg.msg_iovlen = 0;
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msg.msg_flags = MSG_MORE;
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msg.msg_control = cmh;
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msg.msg_controllen = sizeof(buffer);
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cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
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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 = rqstp->rq_daddr;
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if (sock_sendmsg(sock, &msg, 0) < 0)
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goto out;
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}
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/* send head */
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if (slen == xdr->head[0].iov_len)
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flags = 0;
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len = sock->ops->sendpage(sock, rqstp->rq_respages[0], 0, xdr->head[0].iov_len, flags);
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if (len != xdr->head[0].iov_len)
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goto out;
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slen -= xdr->head[0].iov_len;
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if (slen == 0)
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goto out;
|
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|
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/* send page data */
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size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
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while (pglen > 0) {
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if (slen == size)
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flags = 0;
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result = sock->ops->sendpage(sock, *ppage, base, size, flags);
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if (result > 0)
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len += result;
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if (result != size)
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goto out;
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slen -= size;
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pglen -= size;
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size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
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base = 0;
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ppage++;
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}
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/* send tail */
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if (xdr->tail[0].iov_len) {
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result = sock->ops->sendpage(sock, rqstp->rq_respages[rqstp->rq_restailpage],
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((unsigned long)xdr->tail[0].iov_base)& (PAGE_SIZE-1),
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xdr->tail[0].iov_len, 0);
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|
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if (result > 0)
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len += result;
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}
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out:
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dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %x)\n",
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rqstp->rq_sock, xdr->head[0].iov_base, xdr->head[0].iov_len, xdr->len, len,
|
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rqstp->rq_addr.sin_addr.s_addr);
|
|
|
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return len;
|
|
}
|
|
|
|
/*
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* Check input queue length
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*/
|
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static int
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svc_recv_available(struct svc_sock *svsk)
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{
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mm_segment_t oldfs;
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struct socket *sock = svsk->sk_sock;
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int avail, err;
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|
|
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oldfs = get_fs(); set_fs(KERNEL_DS);
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err = sock->ops->ioctl(sock, TIOCINQ, (unsigned long) &avail);
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set_fs(oldfs);
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|
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return (err >= 0)? avail : err;
|
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}
|
|
|
|
/*
|
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* Generic recvfrom routine.
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*/
|
|
static int
|
|
svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, int buflen)
|
|
{
|
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struct msghdr msg;
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struct socket *sock;
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int len, alen;
|
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|
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rqstp->rq_addrlen = sizeof(rqstp->rq_addr);
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sock = rqstp->rq_sock->sk_sock;
|
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|
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msg.msg_name = &rqstp->rq_addr;
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msg.msg_namelen = sizeof(rqstp->rq_addr);
|
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msg.msg_control = NULL;
|
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msg.msg_controllen = 0;
|
|
|
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msg.msg_flags = MSG_DONTWAIT;
|
|
|
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len = kernel_recvmsg(sock, &msg, iov, nr, buflen, MSG_DONTWAIT);
|
|
|
|
/* sock_recvmsg doesn't fill in the name/namelen, so we must..
|
|
* possibly we should cache this in the svc_sock structure
|
|
* at accept time. FIXME
|
|
*/
|
|
alen = sizeof(rqstp->rq_addr);
|
|
sock->ops->getname(sock, (struct sockaddr *)&rqstp->rq_addr, &alen, 1);
|
|
|
|
dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
|
|
rqstp->rq_sock, iov[0].iov_base, iov[0].iov_len, len);
|
|
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Set socket snd and rcv buffer lengths
|
|
*/
|
|
static inline void
|
|
svc_sock_setbufsize(struct socket *sock, unsigned int snd, unsigned int rcv)
|
|
{
|
|
#if 0
|
|
mm_segment_t oldfs;
|
|
oldfs = get_fs(); set_fs(KERNEL_DS);
|
|
sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
|
|
(char*)&snd, sizeof(snd));
|
|
sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
|
|
(char*)&rcv, sizeof(rcv));
|
|
#else
|
|
/* sock_setsockopt limits use to sysctl_?mem_max,
|
|
* which isn't acceptable. Until that is made conditional
|
|
* on not having CAP_SYS_RESOURCE or similar, we go direct...
|
|
* DaveM said I could!
|
|
*/
|
|
lock_sock(sock->sk);
|
|
sock->sk->sk_sndbuf = snd * 2;
|
|
sock->sk->sk_rcvbuf = rcv * 2;
|
|
sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
|
|
release_sock(sock->sk);
|
|
#endif
|
|
}
|
|
/*
|
|
* INET callback when data has been received on the socket.
|
|
*/
|
|
static void
|
|
svc_udp_data_ready(struct sock *sk, int count)
|
|
{
|
|
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
|
|
|
|
if (svsk) {
|
|
dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
|
|
svsk, sk, count, test_bit(SK_BUSY, &svsk->sk_flags));
|
|
set_bit(SK_DATA, &svsk->sk_flags);
|
|
svc_sock_enqueue(svsk);
|
|
}
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible(sk->sk_sleep);
|
|
}
|
|
|
|
/*
|
|
* INET callback when space is newly available on the socket.
|
|
*/
|
|
static void
|
|
svc_write_space(struct sock *sk)
|
|
{
|
|
struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
|
|
|
|
if (svsk) {
|
|
dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
|
|
svsk, sk, test_bit(SK_BUSY, &svsk->sk_flags));
|
|
svc_sock_enqueue(svsk);
|
|
}
|
|
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) {
|
|
dprintk("RPC svc_write_space: someone sleeping on %p\n",
|
|
svsk);
|
|
wake_up_interruptible(sk->sk_sleep);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Receive a datagram from a UDP socket.
|
|
*/
|
|
static int
|
|
svc_udp_recvfrom(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_sock *svsk = rqstp->rq_sock;
|
|
struct svc_serv *serv = svsk->sk_server;
|
|
struct sk_buff *skb;
|
|
int err, len;
|
|
|
|
if (test_and_clear_bit(SK_CHNGBUF, &svsk->sk_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.
|
|
*/
|
|
svc_sock_setbufsize(svsk->sk_sock,
|
|
(serv->sv_nrthreads+3) * serv->sv_bufsz,
|
|
(serv->sv_nrthreads+3) * serv->sv_bufsz);
|
|
|
|
if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) {
|
|
svc_sock_received(svsk);
|
|
return svc_deferred_recv(rqstp);
|
|
}
|
|
|
|
clear_bit(SK_DATA, &svsk->sk_flags);
|
|
while ((skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err)) == NULL) {
|
|
if (err == -EAGAIN) {
|
|
svc_sock_received(svsk);
|
|
return err;
|
|
}
|
|
/* possibly an icmp error */
|
|
dprintk("svc: recvfrom returned error %d\n", -err);
|
|
}
|
|
if (skb->tstamp.off_sec == 0) {
|
|
struct timeval tv;
|
|
|
|
tv.tv_sec = xtime.tv_sec;
|
|
tv.tv_usec = xtime.tv_nsec / NSEC_PER_USEC;
|
|
skb_set_timestamp(skb, &tv);
|
|
/* Don't enable netstamp, sunrpc doesn't
|
|
need that much accuracy */
|
|
}
|
|
skb_get_timestamp(skb, &svsk->sk_sk->sk_stamp);
|
|
set_bit(SK_DATA, &svsk->sk_flags); /* there may be more data... */
|
|
|
|
/*
|
|
* Maybe more packets - kick another thread ASAP.
|
|
*/
|
|
svc_sock_received(svsk);
|
|
|
|
len = skb->len - sizeof(struct udphdr);
|
|
rqstp->rq_arg.len = len;
|
|
|
|
rqstp->rq_prot = IPPROTO_UDP;
|
|
|
|
/* Get sender address */
|
|
rqstp->rq_addr.sin_family = AF_INET;
|
|
rqstp->rq_addr.sin_port = skb->h.uh->source;
|
|
rqstp->rq_addr.sin_addr.s_addr = skb->nh.iph->saddr;
|
|
rqstp->rq_daddr = skb->nh.iph->daddr;
|
|
|
|
if (skb_is_nonlinear(skb)) {
|
|
/* we have to copy */
|
|
local_bh_disable();
|
|
if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) {
|
|
local_bh_enable();
|
|
/* checksum error */
|
|
skb_free_datagram(svsk->sk_sk, skb);
|
|
return 0;
|
|
}
|
|
local_bh_enable();
|
|
skb_free_datagram(svsk->sk_sk, skb);
|
|
} else {
|
|
/* we can use it in-place */
|
|
rqstp->rq_arg.head[0].iov_base = skb->data + sizeof(struct udphdr);
|
|
rqstp->rq_arg.head[0].iov_len = len;
|
|
if (skb_checksum_complete(skb)) {
|
|
skb_free_datagram(svsk->sk_sk, skb);
|
|
return 0;
|
|
}
|
|
rqstp->rq_skbuff = 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;
|
|
} else {
|
|
rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
|
|
rqstp->rq_argused += (rqstp->rq_arg.page_len + PAGE_SIZE - 1)/ PAGE_SIZE;
|
|
}
|
|
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->netudpcnt++;
|
|
|
|
return len;
|
|
}
|
|
|
|
static int
|
|
svc_udp_sendto(struct svc_rqst *rqstp)
|
|
{
|
|
int error;
|
|
|
|
error = svc_sendto(rqstp, &rqstp->rq_res);
|
|
if (error == -ECONNREFUSED)
|
|
/* ICMP error on earlier request. */
|
|
error = svc_sendto(rqstp, &rqstp->rq_res);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
svc_udp_init(struct svc_sock *svsk)
|
|
{
|
|
svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
|
|
svsk->sk_sk->sk_write_space = svc_write_space;
|
|
svsk->sk_recvfrom = svc_udp_recvfrom;
|
|
svsk->sk_sendto = svc_udp_sendto;
|
|
|
|
/* 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->sk_sock,
|
|
3 * svsk->sk_server->sv_bufsz,
|
|
3 * svsk->sk_server->sv_bufsz);
|
|
|
|
set_bit(SK_DATA, &svsk->sk_flags); /* might have come in before data_ready set up */
|
|
set_bit(SK_CHNGBUF, &svsk->sk_flags);
|
|
}
|
|
|
|
/*
|
|
* 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, int count_unused)
|
|
{
|
|
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
|
|
|
|
dprintk("svc: socket %p TCP (listen) state change %d\n",
|
|
sk, sk->sk_state);
|
|
|
|
/*
|
|
* 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(SK_CONN, &svsk->sk_flags);
|
|
svc_sock_enqueue(svsk);
|
|
} else
|
|
printk("svc: socket %p: no user data\n", sk);
|
|
}
|
|
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible_all(sk->sk_sleep);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n",
|
|
sk, sk->sk_state, sk->sk_user_data);
|
|
|
|
if (!svsk)
|
|
printk("svc: socket %p: no user data\n", sk);
|
|
else {
|
|
set_bit(SK_CLOSE, &svsk->sk_flags);
|
|
svc_sock_enqueue(svsk);
|
|
}
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible_all(sk->sk_sleep);
|
|
}
|
|
|
|
static void
|
|
svc_tcp_data_ready(struct sock *sk, int count)
|
|
{
|
|
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
|
|
|
|
dprintk("svc: socket %p TCP data ready (svsk %p)\n",
|
|
sk, sk->sk_user_data);
|
|
if (svsk) {
|
|
set_bit(SK_DATA, &svsk->sk_flags);
|
|
svc_sock_enqueue(svsk);
|
|
}
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible(sk->sk_sleep);
|
|
}
|
|
|
|
/*
|
|
* Accept a TCP connection
|
|
*/
|
|
static void
|
|
svc_tcp_accept(struct svc_sock *svsk)
|
|
{
|
|
struct sockaddr_in sin;
|
|
struct svc_serv *serv = svsk->sk_server;
|
|
struct socket *sock = svsk->sk_sock;
|
|
struct socket *newsock;
|
|
const struct proto_ops *ops;
|
|
struct svc_sock *newsvsk;
|
|
int err, slen;
|
|
|
|
dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
|
|
if (!sock)
|
|
return;
|
|
|
|
err = sock_create_lite(PF_INET, SOCK_STREAM, IPPROTO_TCP, &newsock);
|
|
if (err) {
|
|
if (err == -ENOMEM)
|
|
printk(KERN_WARNING "%s: no more sockets!\n",
|
|
serv->sv_name);
|
|
return;
|
|
}
|
|
|
|
dprintk("svc: tcp_accept %p allocated\n", newsock);
|
|
newsock->ops = ops = sock->ops;
|
|
|
|
clear_bit(SK_CONN, &svsk->sk_flags);
|
|
if ((err = ops->accept(sock, newsock, O_NONBLOCK)) < 0) {
|
|
if (err != -EAGAIN && net_ratelimit())
|
|
printk(KERN_WARNING "%s: accept failed (err %d)!\n",
|
|
serv->sv_name, -err);
|
|
goto failed; /* aborted connection or whatever */
|
|
}
|
|
set_bit(SK_CONN, &svsk->sk_flags);
|
|
svc_sock_enqueue(svsk);
|
|
|
|
slen = sizeof(sin);
|
|
err = ops->getname(newsock, (struct sockaddr *) &sin, &slen, 1);
|
|
if (err < 0) {
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING "%s: peername failed (err %d)!\n",
|
|
serv->sv_name, -err);
|
|
goto failed; /* aborted connection or whatever */
|
|
}
|
|
|
|
/* Ideally, we would want to reject connections from unauthorized
|
|
* hosts here, but when we get encription, the IP of the host won't
|
|
* tell us anything. For now just warn about unpriv connections.
|
|
*/
|
|
if (ntohs(sin.sin_port) >= 1024) {
|
|
dprintk(KERN_WARNING
|
|
"%s: connect from unprivileged port: %u.%u.%u.%u:%d\n",
|
|
serv->sv_name,
|
|
NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
|
|
}
|
|
|
|
dprintk("%s: connect from %u.%u.%u.%u:%04x\n", serv->sv_name,
|
|
NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
|
|
|
|
/* make sure that a write doesn't block forever when
|
|
* low on memory
|
|
*/
|
|
newsock->sk->sk_sndtimeo = HZ*30;
|
|
|
|
if (!(newsvsk = svc_setup_socket(serv, newsock, &err, 0)))
|
|
goto failed;
|
|
|
|
|
|
/* make sure that we don't have too many active connections.
|
|
* If we have, something must be dropped.
|
|
*
|
|
* There's no point in trying to do random drop here for
|
|
* DoS prevention. The NFS clients does 1 reconnect in 15
|
|
* seconds. An attacker can easily beat that.
|
|
*
|
|
* The only somewhat efficient mechanism would be if drop
|
|
* old connections from the same IP first. But right now
|
|
* we don't even record the client IP in svc_sock.
|
|
*/
|
|
if (serv->sv_tmpcnt > (serv->sv_nrthreads+3)*20) {
|
|
struct svc_sock *svsk = NULL;
|
|
spin_lock_bh(&serv->sv_lock);
|
|
if (!list_empty(&serv->sv_tempsocks)) {
|
|
if (net_ratelimit()) {
|
|
/* Try to help the admin */
|
|
printk(KERN_NOTICE "%s: too many open TCP "
|
|
"sockets, consider increasing the "
|
|
"number of nfsd threads\n",
|
|
serv->sv_name);
|
|
printk(KERN_NOTICE "%s: last TCP connect from "
|
|
"%u.%u.%u.%u:%d\n",
|
|
serv->sv_name,
|
|
NIPQUAD(sin.sin_addr.s_addr),
|
|
ntohs(sin.sin_port));
|
|
}
|
|
/*
|
|
* Always select the oldest socket. It's not fair,
|
|
* but so is life
|
|
*/
|
|
svsk = list_entry(serv->sv_tempsocks.prev,
|
|
struct svc_sock,
|
|
sk_list);
|
|
set_bit(SK_CLOSE, &svsk->sk_flags);
|
|
svsk->sk_inuse ++;
|
|
}
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
|
|
if (svsk) {
|
|
svc_sock_enqueue(svsk);
|
|
svc_sock_put(svsk);
|
|
}
|
|
|
|
}
|
|
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->nettcpconn++;
|
|
|
|
return;
|
|
|
|
failed:
|
|
sock_release(newsock);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Receive data from a TCP socket.
|
|
*/
|
|
static int
|
|
svc_tcp_recvfrom(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_sock *svsk = rqstp->rq_sock;
|
|
struct svc_serv *serv = svsk->sk_server;
|
|
int len;
|
|
struct kvec vec[RPCSVC_MAXPAGES];
|
|
int pnum, vlen;
|
|
|
|
dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
|
|
svsk, test_bit(SK_DATA, &svsk->sk_flags),
|
|
test_bit(SK_CONN, &svsk->sk_flags),
|
|
test_bit(SK_CLOSE, &svsk->sk_flags));
|
|
|
|
if ((rqstp->rq_deferred = svc_deferred_dequeue(svsk))) {
|
|
svc_sock_received(svsk);
|
|
return svc_deferred_recv(rqstp);
|
|
}
|
|
|
|
if (test_bit(SK_CLOSE, &svsk->sk_flags)) {
|
|
svc_delete_socket(svsk);
|
|
return 0;
|
|
}
|
|
|
|
if (test_bit(SK_CONN, &svsk->sk_flags)) {
|
|
svc_tcp_accept(svsk);
|
|
svc_sock_received(svsk);
|
|
return 0;
|
|
}
|
|
|
|
if (test_and_clear_bit(SK_CHNGBUF, &svsk->sk_flags))
|
|
/* sndbuf needs to have room for one request
|
|
* per thread, otherwise we can stall even when the
|
|
* network isn't a bottleneck.
|
|
* rcvbuf just needs to be able to hold a few requests.
|
|
* Normally they will be removed from the queue
|
|
* as soon a a complete request arrives.
|
|
*/
|
|
svc_sock_setbufsize(svsk->sk_sock,
|
|
(serv->sv_nrthreads+3) * serv->sv_bufsz,
|
|
3 * serv->sv_bufsz);
|
|
|
|
clear_bit(SK_DATA, &svsk->sk_flags);
|
|
|
|
/* Receive data. If we haven't got the record length yet, get
|
|
* the next four bytes. Otherwise try to gobble up as much as
|
|
* possible up to the complete record length.
|
|
*/
|
|
if (svsk->sk_tcplen < 4) {
|
|
unsigned long want = 4 - svsk->sk_tcplen;
|
|
struct kvec iov;
|
|
|
|
iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen;
|
|
iov.iov_len = want;
|
|
if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0)
|
|
goto error;
|
|
svsk->sk_tcplen += len;
|
|
|
|
if (len < want) {
|
|
dprintk("svc: short recvfrom while reading record length (%d of %lu)\n",
|
|
len, want);
|
|
svc_sock_received(svsk);
|
|
return -EAGAIN; /* record header not complete */
|
|
}
|
|
|
|
svsk->sk_reclen = ntohl(svsk->sk_reclen);
|
|
if (!(svsk->sk_reclen & 0x80000000)) {
|
|
/* FIXME: technically, a record can be fragmented,
|
|
* and non-terminal fragments will not have the top
|
|
* bit set in the fragment length header.
|
|
* But apparently no known nfs clients send fragmented
|
|
* records. */
|
|
printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx (non-terminal)\n",
|
|
(unsigned long) svsk->sk_reclen);
|
|
goto err_delete;
|
|
}
|
|
svsk->sk_reclen &= 0x7fffffff;
|
|
dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
|
|
if (svsk->sk_reclen > serv->sv_bufsz) {
|
|
printk(KERN_NOTICE "RPC: bad TCP reclen 0x%08lx (large)\n",
|
|
(unsigned long) svsk->sk_reclen);
|
|
goto err_delete;
|
|
}
|
|
}
|
|
|
|
/* Check whether enough data is available */
|
|
len = svc_recv_available(svsk);
|
|
if (len < 0)
|
|
goto error;
|
|
|
|
if (len < svsk->sk_reclen) {
|
|
dprintk("svc: incomplete TCP record (%d of %d)\n",
|
|
len, svsk->sk_reclen);
|
|
svc_sock_received(svsk);
|
|
return -EAGAIN; /* record not complete */
|
|
}
|
|
len = svsk->sk_reclen;
|
|
set_bit(SK_DATA, &svsk->sk_flags);
|
|
|
|
vec[0] = rqstp->rq_arg.head[0];
|
|
vlen = PAGE_SIZE;
|
|
pnum = 1;
|
|
while (vlen < len) {
|
|
vec[pnum].iov_base = page_address(rqstp->rq_argpages[rqstp->rq_argused++]);
|
|
vec[pnum].iov_len = PAGE_SIZE;
|
|
pnum++;
|
|
vlen += PAGE_SIZE;
|
|
}
|
|
|
|
/* Now receive data */
|
|
len = svc_recvfrom(rqstp, vec, pnum, len);
|
|
if (len < 0)
|
|
goto error;
|
|
|
|
dprintk("svc: TCP complete record (%d bytes)\n", len);
|
|
rqstp->rq_arg.len = len;
|
|
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;
|
|
} else {
|
|
rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
|
|
}
|
|
|
|
rqstp->rq_skbuff = NULL;
|
|
rqstp->rq_prot = IPPROTO_TCP;
|
|
|
|
/* Reset TCP read info */
|
|
svsk->sk_reclen = 0;
|
|
svsk->sk_tcplen = 0;
|
|
|
|
svc_sock_received(svsk);
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->nettcpcnt++;
|
|
|
|
return len;
|
|
|
|
err_delete:
|
|
svc_delete_socket(svsk);
|
|
return -EAGAIN;
|
|
|
|
error:
|
|
if (len == -EAGAIN) {
|
|
dprintk("RPC: TCP recvfrom got EAGAIN\n");
|
|
svc_sock_received(svsk);
|
|
} else {
|
|
printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
|
|
svsk->sk_server->sv_name, -len);
|
|
goto err_delete;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Send out data on TCP socket.
|
|
*/
|
|
static int
|
|
svc_tcp_sendto(struct svc_rqst *rqstp)
|
|
{
|
|
struct xdr_buf *xbufp = &rqstp->rq_res;
|
|
int sent;
|
|
u32 reclen;
|
|
|
|
/* Set up the first element of the reply kvec.
|
|
* Any other kvecs that may be in use have been taken
|
|
* care of by the server implementation itself.
|
|
*/
|
|
reclen = htonl(0x80000000|((xbufp->len ) - 4));
|
|
memcpy(xbufp->head[0].iov_base, &reclen, 4);
|
|
|
|
if (test_bit(SK_DEAD, &rqstp->rq_sock->sk_flags))
|
|
return -ENOTCONN;
|
|
|
|
sent = svc_sendto(rqstp, &rqstp->rq_res);
|
|
if (sent != xbufp->len) {
|
|
printk(KERN_NOTICE "rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n",
|
|
rqstp->rq_sock->sk_server->sv_name,
|
|
(sent<0)?"got error":"sent only",
|
|
sent, xbufp->len);
|
|
svc_delete_socket(rqstp->rq_sock);
|
|
sent = -EAGAIN;
|
|
}
|
|
return sent;
|
|
}
|
|
|
|
static void
|
|
svc_tcp_init(struct svc_sock *svsk)
|
|
{
|
|
struct sock *sk = svsk->sk_sk;
|
|
struct tcp_sock *tp = tcp_sk(sk);
|
|
|
|
svsk->sk_recvfrom = svc_tcp_recvfrom;
|
|
svsk->sk_sendto = svc_tcp_sendto;
|
|
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
dprintk("setting up TCP socket for listening\n");
|
|
sk->sk_data_ready = svc_tcp_listen_data_ready;
|
|
set_bit(SK_CONN, &svsk->sk_flags);
|
|
} else {
|
|
dprintk("setting up TCP socket for reading\n");
|
|
sk->sk_state_change = svc_tcp_state_change;
|
|
sk->sk_data_ready = svc_tcp_data_ready;
|
|
sk->sk_write_space = svc_write_space;
|
|
|
|
svsk->sk_reclen = 0;
|
|
svsk->sk_tcplen = 0;
|
|
|
|
tp->nonagle = 1; /* disable Nagle's algorithm */
|
|
|
|
/* initialise setting must have enough space to
|
|
* receive and respond to one request.
|
|
* svc_tcp_recvfrom will re-adjust if necessary
|
|
*/
|
|
svc_sock_setbufsize(svsk->sk_sock,
|
|
3 * svsk->sk_server->sv_bufsz,
|
|
3 * svsk->sk_server->sv_bufsz);
|
|
|
|
set_bit(SK_CHNGBUF, &svsk->sk_flags);
|
|
set_bit(SK_DATA, &svsk->sk_flags);
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
set_bit(SK_CLOSE, &svsk->sk_flags);
|
|
}
|
|
}
|
|
|
|
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 list_head *le;
|
|
|
|
spin_lock_bh(&serv->sv_lock);
|
|
list_for_each(le, &serv->sv_permsocks) {
|
|
struct svc_sock *svsk =
|
|
list_entry(le, struct svc_sock, sk_list);
|
|
set_bit(SK_CHNGBUF, &svsk->sk_flags);
|
|
}
|
|
list_for_each(le, &serv->sv_tempsocks) {
|
|
struct svc_sock *svsk =
|
|
list_entry(le, struct svc_sock, sk_list);
|
|
set_bit(SK_CHNGBUF, &svsk->sk_flags);
|
|
}
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
}
|
|
|
|
/*
|
|
* Receive the next request on any socket.
|
|
*/
|
|
int
|
|
svc_recv(struct svc_serv *serv, struct svc_rqst *rqstp, long timeout)
|
|
{
|
|
struct svc_sock *svsk =NULL;
|
|
int len;
|
|
int pages;
|
|
struct xdr_buf *arg;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
dprintk("svc: server %p waiting for data (to = %ld)\n",
|
|
rqstp, timeout);
|
|
|
|
if (rqstp->rq_sock)
|
|
printk(KERN_ERR
|
|
"svc_recv: service %p, socket not NULL!\n",
|
|
rqstp);
|
|
if (waitqueue_active(&rqstp->rq_wait))
|
|
printk(KERN_ERR
|
|
"svc_recv: service %p, wait queue active!\n",
|
|
rqstp);
|
|
|
|
/* Initialize the buffers */
|
|
/* first reclaim pages that were moved to response list */
|
|
svc_pushback_allpages(rqstp);
|
|
|
|
/* now allocate needed pages. If we get a failure, sleep briefly */
|
|
pages = 2 + (serv->sv_bufsz + PAGE_SIZE -1) / PAGE_SIZE;
|
|
while (rqstp->rq_arghi < pages) {
|
|
struct page *p = alloc_page(GFP_KERNEL);
|
|
if (!p) {
|
|
schedule_timeout_uninterruptible(msecs_to_jiffies(500));
|
|
continue;
|
|
}
|
|
rqstp->rq_argpages[rqstp->rq_arghi++] = p;
|
|
}
|
|
|
|
/* Make arg->head point to first page and arg->pages point to rest */
|
|
arg = &rqstp->rq_arg;
|
|
arg->head[0].iov_base = page_address(rqstp->rq_argpages[0]);
|
|
arg->head[0].iov_len = PAGE_SIZE;
|
|
rqstp->rq_argused = 1;
|
|
arg->pages = rqstp->rq_argpages + 1;
|
|
arg->page_base = 0;
|
|
/* save at least one page for response */
|
|
arg->page_len = (pages-2)*PAGE_SIZE;
|
|
arg->len = (pages-1)*PAGE_SIZE;
|
|
arg->tail[0].iov_len = 0;
|
|
|
|
try_to_freeze();
|
|
cond_resched();
|
|
if (signalled())
|
|
return -EINTR;
|
|
|
|
spin_lock_bh(&serv->sv_lock);
|
|
if (!list_empty(&serv->sv_tempsocks)) {
|
|
svsk = list_entry(serv->sv_tempsocks.next,
|
|
struct svc_sock, sk_list);
|
|
/* apparently the "standard" is that clients close
|
|
* idle connections after 5 minutes, servers after
|
|
* 6 minutes
|
|
* http://www.connectathon.org/talks96/nfstcp.pdf
|
|
*/
|
|
if (get_seconds() - svsk->sk_lastrecv < 6*60
|
|
|| test_bit(SK_BUSY, &svsk->sk_flags))
|
|
svsk = NULL;
|
|
}
|
|
if (svsk) {
|
|
set_bit(SK_BUSY, &svsk->sk_flags);
|
|
set_bit(SK_CLOSE, &svsk->sk_flags);
|
|
rqstp->rq_sock = svsk;
|
|
svsk->sk_inuse++;
|
|
} else if ((svsk = svc_sock_dequeue(serv)) != NULL) {
|
|
rqstp->rq_sock = svsk;
|
|
svsk->sk_inuse++;
|
|
rqstp->rq_reserved = serv->sv_bufsz;
|
|
svsk->sk_reserved += rqstp->rq_reserved;
|
|
} else {
|
|
/* No data pending. Go to sleep */
|
|
svc_serv_enqueue(serv, rqstp);
|
|
|
|
/*
|
|
* We have to be able to interrupt this wait
|
|
* to bring down the daemons ...
|
|
*/
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
add_wait_queue(&rqstp->rq_wait, &wait);
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
|
|
schedule_timeout(timeout);
|
|
|
|
try_to_freeze();
|
|
|
|
spin_lock_bh(&serv->sv_lock);
|
|
remove_wait_queue(&rqstp->rq_wait, &wait);
|
|
|
|
if (!(svsk = rqstp->rq_sock)) {
|
|
svc_serv_dequeue(serv, rqstp);
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
dprintk("svc: server %p, no data yet\n", rqstp);
|
|
return signalled()? -EINTR : -EAGAIN;
|
|
}
|
|
}
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
|
|
dprintk("svc: server %p, socket %p, inuse=%d\n",
|
|
rqstp, svsk, svsk->sk_inuse);
|
|
len = svsk->sk_recvfrom(rqstp);
|
|
dprintk("svc: got len=%d\n", len);
|
|
|
|
/* No data, incomplete (TCP) read, or accept() */
|
|
if (len == 0 || len == -EAGAIN) {
|
|
rqstp->rq_res.len = 0;
|
|
svc_sock_release(rqstp);
|
|
return -EAGAIN;
|
|
}
|
|
svsk->sk_lastrecv = get_seconds();
|
|
if (test_bit(SK_TEMP, &svsk->sk_flags)) {
|
|
/* push active sockets to end of list */
|
|
spin_lock_bh(&serv->sv_lock);
|
|
if (!list_empty(&svsk->sk_list))
|
|
list_move_tail(&svsk->sk_list, &serv->sv_tempsocks);
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
}
|
|
|
|
rqstp->rq_secure = ntohs(rqstp->rq_addr.sin_port) < 1024;
|
|
rqstp->rq_chandle.defer = svc_defer;
|
|
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->netcnt++;
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Drop request
|
|
*/
|
|
void
|
|
svc_drop(struct svc_rqst *rqstp)
|
|
{
|
|
dprintk("svc: socket %p dropped request\n", rqstp->rq_sock);
|
|
svc_sock_release(rqstp);
|
|
}
|
|
|
|
/*
|
|
* Return reply to client.
|
|
*/
|
|
int
|
|
svc_send(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_sock *svsk;
|
|
int len;
|
|
struct xdr_buf *xb;
|
|
|
|
if ((svsk = rqstp->rq_sock) == NULL) {
|
|
printk(KERN_WARNING "NULL socket pointer in %s:%d\n",
|
|
__FILE__, __LINE__);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/* release the receive skb before sending the reply */
|
|
svc_release_skb(rqstp);
|
|
|
|
/* calculate over-all length */
|
|
xb = & rqstp->rq_res;
|
|
xb->len = xb->head[0].iov_len +
|
|
xb->page_len +
|
|
xb->tail[0].iov_len;
|
|
|
|
/* Grab svsk->sk_mutex to serialize outgoing data. */
|
|
mutex_lock(&svsk->sk_mutex);
|
|
if (test_bit(SK_DEAD, &svsk->sk_flags))
|
|
len = -ENOTCONN;
|
|
else
|
|
len = svsk->sk_sendto(rqstp);
|
|
mutex_unlock(&svsk->sk_mutex);
|
|
svc_sock_release(rqstp);
|
|
|
|
if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN)
|
|
return 0;
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Initialize socket for RPC use and create svc_sock struct
|
|
* XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF.
|
|
*/
|
|
static struct svc_sock *
|
|
svc_setup_socket(struct svc_serv *serv, struct socket *sock,
|
|
int *errp, int pmap_register)
|
|
{
|
|
struct svc_sock *svsk;
|
|
struct sock *inet;
|
|
|
|
dprintk("svc: svc_setup_socket %p\n", sock);
|
|
if (!(svsk = kmalloc(sizeof(*svsk), GFP_KERNEL))) {
|
|
*errp = -ENOMEM;
|
|
return NULL;
|
|
}
|
|
memset(svsk, 0, sizeof(*svsk));
|
|
|
|
inet = sock->sk;
|
|
|
|
/* Register socket with portmapper */
|
|
if (*errp >= 0 && pmap_register)
|
|
*errp = svc_register(serv, inet->sk_protocol,
|
|
ntohs(inet_sk(inet)->sport));
|
|
|
|
if (*errp < 0) {
|
|
kfree(svsk);
|
|
return NULL;
|
|
}
|
|
|
|
set_bit(SK_BUSY, &svsk->sk_flags);
|
|
inet->sk_user_data = svsk;
|
|
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;
|
|
svsk->sk_server = serv;
|
|
svsk->sk_lastrecv = get_seconds();
|
|
INIT_LIST_HEAD(&svsk->sk_deferred);
|
|
INIT_LIST_HEAD(&svsk->sk_ready);
|
|
mutex_init(&svsk->sk_mutex);
|
|
|
|
/* Initialize the socket */
|
|
if (sock->type == SOCK_DGRAM)
|
|
svc_udp_init(svsk);
|
|
else
|
|
svc_tcp_init(svsk);
|
|
|
|
spin_lock_bh(&serv->sv_lock);
|
|
if (!pmap_register) {
|
|
set_bit(SK_TEMP, &svsk->sk_flags);
|
|
list_add(&svsk->sk_list, &serv->sv_tempsocks);
|
|
serv->sv_tmpcnt++;
|
|
} else {
|
|
clear_bit(SK_TEMP, &svsk->sk_flags);
|
|
list_add(&svsk->sk_list, &serv->sv_permsocks);
|
|
}
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
|
|
dprintk("svc: svc_setup_socket created %p (inet %p)\n",
|
|
svsk, svsk->sk_sk);
|
|
|
|
clear_bit(SK_BUSY, &svsk->sk_flags);
|
|
svc_sock_enqueue(svsk);
|
|
return svsk;
|
|
}
|
|
|
|
/*
|
|
* Create socket for RPC service.
|
|
*/
|
|
static int
|
|
svc_create_socket(struct svc_serv *serv, int protocol, struct sockaddr_in *sin)
|
|
{
|
|
struct svc_sock *svsk;
|
|
struct socket *sock;
|
|
int error;
|
|
int type;
|
|
|
|
dprintk("svc: svc_create_socket(%s, %d, %u.%u.%u.%u:%d)\n",
|
|
serv->sv_program->pg_name, protocol,
|
|
NIPQUAD(sin->sin_addr.s_addr),
|
|
ntohs(sin->sin_port));
|
|
|
|
if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) {
|
|
printk(KERN_WARNING "svc: only UDP and TCP "
|
|
"sockets supported\n");
|
|
return -EINVAL;
|
|
}
|
|
type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
|
|
|
|
if ((error = sock_create_kern(PF_INET, type, protocol, &sock)) < 0)
|
|
return error;
|
|
|
|
if (sin != NULL) {
|
|
if (type == SOCK_STREAM)
|
|
sock->sk->sk_reuse = 1; /* allow address reuse */
|
|
error = sock->ops->bind(sock, (struct sockaddr *) sin,
|
|
sizeof(*sin));
|
|
if (error < 0)
|
|
goto bummer;
|
|
}
|
|
|
|
if (protocol == IPPROTO_TCP) {
|
|
if ((error = sock->ops->listen(sock, 64)) < 0)
|
|
goto bummer;
|
|
}
|
|
|
|
if ((svsk = svc_setup_socket(serv, sock, &error, 1)) != NULL)
|
|
return 0;
|
|
|
|
bummer:
|
|
dprintk("svc: svc_create_socket error = %d\n", -error);
|
|
sock_release(sock);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Remove a dead socket
|
|
*/
|
|
void
|
|
svc_delete_socket(struct svc_sock *svsk)
|
|
{
|
|
struct svc_serv *serv;
|
|
struct sock *sk;
|
|
|
|
dprintk("svc: svc_delete_socket(%p)\n", svsk);
|
|
|
|
serv = svsk->sk_server;
|
|
sk = svsk->sk_sk;
|
|
|
|
sk->sk_state_change = svsk->sk_ostate;
|
|
sk->sk_data_ready = svsk->sk_odata;
|
|
sk->sk_write_space = svsk->sk_owspace;
|
|
|
|
spin_lock_bh(&serv->sv_lock);
|
|
|
|
list_del_init(&svsk->sk_list);
|
|
list_del_init(&svsk->sk_ready);
|
|
if (!test_and_set_bit(SK_DEAD, &svsk->sk_flags))
|
|
if (test_bit(SK_TEMP, &svsk->sk_flags))
|
|
serv->sv_tmpcnt--;
|
|
|
|
if (!svsk->sk_inuse) {
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
sock_release(svsk->sk_sock);
|
|
kfree(svsk);
|
|
} else {
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
dprintk(KERN_NOTICE "svc: server socket destroy delayed\n");
|
|
/* svsk->sk_server = NULL; */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make a socket for nfsd and lockd
|
|
*/
|
|
int
|
|
svc_makesock(struct svc_serv *serv, int protocol, unsigned short port)
|
|
{
|
|
struct sockaddr_in sin;
|
|
|
|
dprintk("svc: creating socket proto = %d\n", protocol);
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_addr.s_addr = INADDR_ANY;
|
|
sin.sin_port = htons(port);
|
|
return svc_create_socket(serv, protocol, &sin);
|
|
}
|
|
|
|
/*
|
|
* Handle defer and revisit of requests
|
|
*/
|
|
|
|
static void svc_revisit(struct cache_deferred_req *dreq, int too_many)
|
|
{
|
|
struct svc_deferred_req *dr = container_of(dreq, struct svc_deferred_req, handle);
|
|
struct svc_serv *serv = dreq->owner;
|
|
struct svc_sock *svsk;
|
|
|
|
if (too_many) {
|
|
svc_sock_put(dr->svsk);
|
|
kfree(dr);
|
|
return;
|
|
}
|
|
dprintk("revisit queued\n");
|
|
svsk = dr->svsk;
|
|
dr->svsk = NULL;
|
|
spin_lock_bh(&serv->sv_lock);
|
|
list_add(&dr->handle.recent, &svsk->sk_deferred);
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
set_bit(SK_DEFERRED, &svsk->sk_flags);
|
|
svc_sock_enqueue(svsk);
|
|
svc_sock_put(svsk);
|
|
}
|
|
|
|
static struct cache_deferred_req *
|
|
svc_defer(struct cache_req *req)
|
|
{
|
|
struct svc_rqst *rqstp = container_of(req, struct svc_rqst, rq_chandle);
|
|
int size = sizeof(struct svc_deferred_req) + (rqstp->rq_arg.len);
|
|
struct svc_deferred_req *dr;
|
|
|
|
if (rqstp->rq_arg.page_len)
|
|
return NULL; /* if more than a page, give up FIXME */
|
|
if (rqstp->rq_deferred) {
|
|
dr = rqstp->rq_deferred;
|
|
rqstp->rq_deferred = NULL;
|
|
} else {
|
|
int skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
|
|
/* FIXME maybe discard if size too large */
|
|
dr = kmalloc(size, GFP_KERNEL);
|
|
if (dr == NULL)
|
|
return NULL;
|
|
|
|
dr->handle.owner = rqstp->rq_server;
|
|
dr->prot = rqstp->rq_prot;
|
|
dr->addr = rqstp->rq_addr;
|
|
dr->daddr = rqstp->rq_daddr;
|
|
dr->argslen = rqstp->rq_arg.len >> 2;
|
|
memcpy(dr->args, rqstp->rq_arg.head[0].iov_base-skip, dr->argslen<<2);
|
|
}
|
|
spin_lock_bh(&rqstp->rq_server->sv_lock);
|
|
rqstp->rq_sock->sk_inuse++;
|
|
dr->svsk = rqstp->rq_sock;
|
|
spin_unlock_bh(&rqstp->rq_server->sv_lock);
|
|
|
|
dr->handle.revisit = svc_revisit;
|
|
return &dr->handle;
|
|
}
|
|
|
|
/*
|
|
* recv data from a deferred request into an active one
|
|
*/
|
|
static int svc_deferred_recv(struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_deferred_req *dr = rqstp->rq_deferred;
|
|
|
|
rqstp->rq_arg.head[0].iov_base = dr->args;
|
|
rqstp->rq_arg.head[0].iov_len = dr->argslen<<2;
|
|
rqstp->rq_arg.page_len = 0;
|
|
rqstp->rq_arg.len = dr->argslen<<2;
|
|
rqstp->rq_prot = dr->prot;
|
|
rqstp->rq_addr = dr->addr;
|
|
rqstp->rq_daddr = dr->daddr;
|
|
return dr->argslen<<2;
|
|
}
|
|
|
|
|
|
static struct svc_deferred_req *svc_deferred_dequeue(struct svc_sock *svsk)
|
|
{
|
|
struct svc_deferred_req *dr = NULL;
|
|
struct svc_serv *serv = svsk->sk_server;
|
|
|
|
if (!test_bit(SK_DEFERRED, &svsk->sk_flags))
|
|
return NULL;
|
|
spin_lock_bh(&serv->sv_lock);
|
|
clear_bit(SK_DEFERRED, &svsk->sk_flags);
|
|
if (!list_empty(&svsk->sk_deferred)) {
|
|
dr = list_entry(svsk->sk_deferred.next,
|
|
struct svc_deferred_req,
|
|
handle.recent);
|
|
list_del_init(&dr->handle.recent);
|
|
set_bit(SK_DEFERRED, &svsk->sk_flags);
|
|
}
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
return dr;
|
|
}
|