![Linus Torvalds](/assets/img/avatar_default.png)
* 'for-3.3' of git://linux-nfs.org/~bfields/linux: (31 commits) nfsd4: nfsd4_create_clid_dir return value is unused NFSD: Change name of extended attribute containing junction svcrpc: don't revert to SVC_POOL_DEFAULT on nfsd shutdown svcrpc: fix double-free on shutdown of nfsd after changing pool mode nfsd4: be forgiving in the absence of the recovery directory nfsd4: fix spurious 4.1 post-reboot failures NFSD: forget_delegations should use list_for_each_entry_safe NFSD: Only reinitilize the recall_lru list under the recall lock nfsd4: initialize special stateid's at compile time NFSd: use network-namespace-aware cache registering routines SUNRPC: create svc_xprt in proper network namespace svcrpc: update outdated BKL comment nfsd41: allow non-reclaim open-by-fh's in 4.1 svcrpc: avoid memory-corruption on pool shutdown svcrpc: destroy server sockets all at once svcrpc: make svc_delete_xprt static nfsd: Fix oops when parsing a 0 length export nfsd4: Use kmemdup rather than duplicating its implementation nfsd4: add a separate (lockowner, inode) lookup nfsd4: fix CONFIG_NFSD_FAULT_INJECTION compile error ...
1680 lines
43 KiB
C
1680 lines
43 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_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/tcp.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/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 "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 *errp, int flags);
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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 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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#if defined(CONFIG_SUNRPC_BACKCHANNEL)
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static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
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struct net *, struct sockaddr *,
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int, int);
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static void svc_bc_sock_free(struct svc_xprt *xprt);
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#endif /* CONFIG_SUNRPC_BACKCHANNEL */
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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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BUG_ON(sock_owned_by_user(sk));
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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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* Release an skbuff after use
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*/
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static void svc_release_skb(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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dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
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skb_free_datagram_locked(svsk->sk_sk, 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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/*
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* send routine intended to be shared by the fore- and back-channel
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*/
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int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
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struct page *headpage, unsigned long headoffset,
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struct page *tailpage, unsigned long tailoffset)
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{
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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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int slen;
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int len = 0;
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slen = xdr->len;
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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 = kernel_sendpage(sock, headpage, headoffset,
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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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/* 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 = kernel_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 = kernel_sendpage(sock, tailpage, tailoffset,
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xdr->tail[0].iov_len, 0);
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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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return len;
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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 svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
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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 socket *sock = svsk->sk_sock;
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union {
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struct cmsghdr hdr;
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long all[SVC_PKTINFO_SPACE / sizeof(long)];
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} buffer;
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struct cmsghdr *cmh = &buffer.hdr;
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int len = 0;
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unsigned long tailoff;
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unsigned long headoff;
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RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
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if (rqstp->rq_prot == IPPROTO_UDP) {
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struct msghdr msg = {
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.msg_name = &rqstp->rq_addr,
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.msg_namelen = rqstp->rq_addrlen,
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.msg_control = cmh,
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.msg_controllen = sizeof(buffer),
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.msg_flags = MSG_MORE,
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};
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svc_set_cmsg_data(rqstp, cmh);
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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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tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
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headoff = 0;
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len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
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rqstp->rq_respages[0], tailoff);
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out:
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dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
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svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
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xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
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return len;
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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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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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&inet6_sk(sk)->rcv_saddr,
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inet_sk(sk)->inet_num);
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break;
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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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/**
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* svc_sock_names - construct a list of listener names in a string
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* @serv: pointer to RPC service
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* @buf: pointer to a buffer to fill in with socket names
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* @buflen: size of the buffer to be filled
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* @toclose: pointer to '\0'-terminated C string containing the name
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* of a listener to be closed
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*
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* Fills in @buf with a '\n'-separated list of names of listener
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* sockets. If @toclose is not NULL, the socket named by @toclose
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* is closed, and is not included in the output list.
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*
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* Returns positive length of the socket name string, or a negative
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* errno value on error.
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*/
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int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen,
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const char *toclose)
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{
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struct svc_sock *svsk, *closesk = NULL;
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int len = 0;
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if (!serv)
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return 0;
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spin_lock_bh(&serv->sv_lock);
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list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) {
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int onelen = svc_one_sock_name(svsk, buf + len, buflen - len);
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if (onelen < 0) {
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len = onelen;
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break;
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}
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if (toclose && strcmp(toclose, buf + len) == 0) {
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closesk = svsk;
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svc_xprt_get(&closesk->sk_xprt);
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} else
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len += onelen;
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}
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spin_unlock_bh(&serv->sv_lock);
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if (closesk) {
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/* Should unregister with portmap, but you cannot
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* unregister just one protocol...
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*/
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svc_close_xprt(&closesk->sk_xprt);
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svc_xprt_put(&closesk->sk_xprt);
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} else if (toclose)
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return -ENOENT;
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return len;
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}
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EXPORT_SYMBOL_GPL(svc_sock_names);
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/*
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* Check input queue length
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*/
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static int svc_recv_available(struct svc_sock *svsk)
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{
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struct socket *sock = svsk->sk_sock;
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int avail, err;
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err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail);
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return (err >= 0)? avail : err;
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}
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/*
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* Generic recvfrom routine.
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*/
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static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
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int buflen)
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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 msghdr msg = {
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.msg_flags = MSG_DONTWAIT,
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};
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int len;
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rqstp->rq_xprt_hlen = 0;
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len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
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msg.msg_flags);
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dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
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svsk, iov[0].iov_base, iov[0].iov_len, len);
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return len;
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}
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static int svc_partial_recvfrom(struct svc_rqst *rqstp,
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struct kvec *iov, int nr,
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int buflen, unsigned int base)
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{
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size_t save_iovlen;
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void __user *save_iovbase;
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unsigned int i;
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int ret;
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|
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if (base == 0)
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return svc_recvfrom(rqstp, iov, nr, buflen);
|
|
|
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for (i = 0; i < nr; i++) {
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if (iov[i].iov_len > base)
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break;
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base -= iov[i].iov_len;
|
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}
|
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save_iovlen = iov[i].iov_len;
|
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save_iovbase = iov[i].iov_base;
|
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iov[i].iov_len -= base;
|
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iov[i].iov_base += base;
|
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ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
|
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iov[i].iov_len = save_iovlen;
|
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iov[i].iov_base = save_iovbase;
|
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return ret;
|
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}
|
|
|
|
/*
|
|
* Set socket snd and rcv buffer lengths
|
|
*/
|
|
static 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_write_space(sock->sk);
|
|
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;
|
|
wait_queue_head_t *wq = sk_sleep(sk);
|
|
|
|
if (svsk) {
|
|
dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n",
|
|
svsk, sk, count,
|
|
test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&svsk->sk_xprt);
|
|
}
|
|
if (wq && waitqueue_active(wq))
|
|
wake_up_interruptible(wq);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
wait_queue_head_t *wq = sk_sleep(sk);
|
|
|
|
if (svsk) {
|
|
dprintk("svc: socket %p(inet %p), write_space busy=%d\n",
|
|
svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags));
|
|
svc_xprt_enqueue(&svsk->sk_xprt);
|
|
}
|
|
|
|
if (wq && waitqueue_active(wq)) {
|
|
dprintk("RPC svc_write_space: someone sleeping on %p\n",
|
|
svsk);
|
|
wake_up_interruptible(wq);
|
|
}
|
|
}
|
|
|
|
static void svc_tcp_write_space(struct sock *sk)
|
|
{
|
|
struct socket *sock = sk->sk_socket;
|
|
|
|
if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock)
|
|
clear_bit(SOCK_NOSPACE, &sock->flags);
|
|
svc_write_space(sk);
|
|
}
|
|
|
|
/*
|
|
* See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
|
|
*/
|
|
static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
|
|
struct cmsghdr *cmh)
|
|
{
|
|
struct in_pktinfo *pki = CMSG_DATA(cmh);
|
|
struct sockaddr_in *daddr = svc_daddr_in(rqstp);
|
|
|
|
if (cmh->cmsg_type != IP_PKTINFO)
|
|
return 0;
|
|
|
|
daddr->sin_family = AF_INET;
|
|
daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* See net/ipv6/datagram.c : datagram_recv_ctl
|
|
*/
|
|
static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
|
|
struct cmsghdr *cmh)
|
|
{
|
|
struct in6_pktinfo *pki = CMSG_DATA(cmh);
|
|
struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
|
|
|
|
if (cmh->cmsg_type != IPV6_PKTINFO)
|
|
return 0;
|
|
|
|
daddr->sin6_family = AF_INET6;
|
|
daddr->sin6_addr = pki->ipi6_addr;
|
|
daddr->sin6_scope_id = pki->ipi6_ifindex;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Copy the UDP datagram's destination address to the rqstp structure.
|
|
* The 'destination' address in this case is the address to which the
|
|
* peer sent the datagram, i.e. our local address. For multihomed
|
|
* hosts, this can change from msg to msg. Note that only the IP
|
|
* address changes, the port number should remain the same.
|
|
*/
|
|
static int svc_udp_get_dest_address(struct svc_rqst *rqstp,
|
|
struct cmsghdr *cmh)
|
|
{
|
|
switch (cmh->cmsg_level) {
|
|
case SOL_IP:
|
|
return svc_udp_get_dest_address4(rqstp, cmh);
|
|
case SOL_IPV6:
|
|
return svc_udp_get_dest_address6(rqstp, cmh);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Receive a datagram from a UDP socket.
|
|
*/
|
|
static int svc_udp_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;
|
|
struct sk_buff *skb;
|
|
union {
|
|
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->sk_sock,
|
|
(serv->sv_nrthreads+3) * serv->sv_max_mesg,
|
|
(serv->sv_nrthreads+3) * serv->sv_max_mesg);
|
|
|
|
clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
skb = NULL;
|
|
err = kernel_recvmsg(svsk->sk_sock, &msg, NULL,
|
|
0, 0, MSG_PEEK | MSG_DONTWAIT);
|
|
if (err >= 0)
|
|
skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err);
|
|
|
|
if (skb == NULL) {
|
|
if (err != -EAGAIN) {
|
|
/* possibly an icmp error */
|
|
dprintk("svc: recvfrom returned error %d\n", -err);
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
}
|
|
return -EAGAIN;
|
|
}
|
|
len = svc_addr_len(svc_addr(rqstp));
|
|
if (len == 0)
|
|
return -EAFNOSUPPORT;
|
|
rqstp->rq_addrlen = len;
|
|
if (skb->tstamp.tv64 == 0) {
|
|
skb->tstamp = ktime_get_real();
|
|
/* Don't enable netstamp, sunrpc doesn't
|
|
need that much accuracy */
|
|
}
|
|
svsk->sk_sk->sk_stamp = skb->tstamp;
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
|
|
|
|
len = skb->len - sizeof(struct udphdr);
|
|
rqstp->rq_arg.len = len;
|
|
|
|
rqstp->rq_prot = IPPROTO_UDP;
|
|
|
|
if (!svc_udp_get_dest_address(rqstp, cmh)) {
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING
|
|
"svc: received unknown control message %d/%d; "
|
|
"dropping RPC reply datagram\n",
|
|
cmh->cmsg_level, cmh->cmsg_type);
|
|
skb_free_datagram_locked(svsk->sk_sk, skb);
|
|
return 0;
|
|
}
|
|
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)) {
|
|
local_bh_enable();
|
|
/* checksum error */
|
|
skb_free_datagram_locked(svsk->sk_sk, skb);
|
|
return 0;
|
|
}
|
|
local_bh_enable();
|
|
skb_free_datagram_locked(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_locked(svsk->sk_sk, skb);
|
|
return 0;
|
|
}
|
|
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);
|
|
}
|
|
|
|
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_prep_reply_hdr(struct svc_rqst *rqstp)
|
|
{
|
|
}
|
|
|
|
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 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 struct svc_xprt_ops svc_udp_ops = {
|
|
.xpo_create = svc_udp_create,
|
|
.xpo_recvfrom = svc_udp_recvfrom,
|
|
.xpo_sendto = svc_udp_sendto,
|
|
.xpo_release_rqst = svc_release_skb,
|
|
.xpo_detach = svc_sock_detach,
|
|
.xpo_free = svc_sock_free,
|
|
.xpo_prep_reply_hdr = svc_udp_prep_reply_hdr,
|
|
.xpo_has_wspace = svc_udp_has_wspace,
|
|
.xpo_accept = svc_udp_accept,
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
|
|
{
|
|
int err, level, optname, one = 1;
|
|
|
|
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_udp_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->sk_sock,
|
|
3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
|
|
3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
|
|
|
|
/* 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:
|
|
level = SOL_IP;
|
|
optname = IP_PKTINFO;
|
|
break;
|
|
case AF_INET6:
|
|
level = SOL_IPV6;
|
|
optname = IPV6_RECVPKTINFO;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
err = kernel_setsockopt(svsk->sk_sock, level, optname,
|
|
(char *)&one, sizeof(one));
|
|
dprintk("svc: kernel_setsockopt returned %d\n", err);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
wait_queue_head_t *wq;
|
|
|
|
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(XPT_CONN, &svsk->sk_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&svsk->sk_xprt);
|
|
} else
|
|
printk("svc: socket %p: no user data\n", sk);
|
|
}
|
|
|
|
wq = sk_sleep(sk);
|
|
if (wq && waitqueue_active(wq))
|
|
wake_up_interruptible_all(wq);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
wait_queue_head_t *wq = sk_sleep(sk);
|
|
|
|
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(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&svsk->sk_xprt);
|
|
}
|
|
if (wq && waitqueue_active(wq))
|
|
wake_up_interruptible_all(wq);
|
|
}
|
|
|
|
static void svc_tcp_data_ready(struct sock *sk, int count)
|
|
{
|
|
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data;
|
|
wait_queue_head_t *wq = sk_sleep(sk);
|
|
|
|
dprintk("svc: socket %p TCP data ready (svsk %p)\n",
|
|
sk, sk->sk_user_data);
|
|
if (svsk) {
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
svc_xprt_enqueue(&svsk->sk_xprt);
|
|
}
|
|
if (wq && waitqueue_active(wq))
|
|
wake_up_interruptible(wq);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
|
|
|
|
dprintk("svc: tcp_accept %p sock %p\n", svsk, sock);
|
|
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_ratelimit())
|
|
printk(KERN_WARNING "%s: accept failed (err %d)!\n",
|
|
serv->sv_name, -err);
|
|
return NULL;
|
|
}
|
|
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags);
|
|
|
|
err = kernel_getpeername(newsock, sin, &slen);
|
|
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 encryption, the IP of the host won't
|
|
* tell us anything. For now just warn about unpriv connections.
|
|
*/
|
|
if (!svc_port_is_privileged(sin)) {
|
|
dprintk(KERN_WARNING
|
|
"%s: connect from unprivileged port: %s\n",
|
|
serv->sv_name,
|
|
__svc_print_addr(sin, buf, sizeof(buf)));
|
|
}
|
|
dprintk("%s: connect from %s\n", serv->sv_name,
|
|
__svc_print_addr(sin, buf, sizeof(buf)));
|
|
|
|
/* 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,
|
|
(SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY))))
|
|
goto failed;
|
|
svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen);
|
|
err = kernel_getsockname(newsock, sin, &slen);
|
|
if (unlikely(err < 0)) {
|
|
dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err);
|
|
slen = offsetof(struct sockaddr, sa_data);
|
|
}
|
|
svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen);
|
|
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->nettcpconn++;
|
|
|
|
return &newsvsk->sk_xprt;
|
|
|
|
failed:
|
|
sock_release(newsock);
|
|
return NULL;
|
|
}
|
|
|
|
static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
|
|
{
|
|
unsigned int i, len, npages;
|
|
|
|
if (svsk->sk_tcplen <= sizeof(rpc_fraghdr))
|
|
return 0;
|
|
len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
|
|
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_tcplen <= sizeof(rpc_fraghdr))
|
|
return;
|
|
len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
|
|
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_tcplen <= sizeof(rpc_fraghdr))
|
|
goto out;
|
|
len = svsk->sk_tcplen - sizeof(rpc_fraghdr);
|
|
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
for (i = 0; i < npages; i++) {
|
|
BUG_ON(svsk->sk_pages[i] == NULL);
|
|
put_page(svsk->sk_pages[i]);
|
|
svsk->sk_pages[i] = NULL;
|
|
}
|
|
out:
|
|
svsk->sk_tcplen = 0;
|
|
}
|
|
|
|
/*
|
|
* Receive data.
|
|
* If we haven't gotten the record length yet, get the next four bytes.
|
|
* Otherwise try to gobble up as much as possible up to the complete
|
|
* record length.
|
|
*/
|
|
static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
|
|
{
|
|
struct svc_serv *serv = svsk->sk_xprt.xpt_server;
|
|
unsigned int want;
|
|
int len;
|
|
|
|
clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
|
|
if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) {
|
|
struct kvec iov;
|
|
|
|
want = sizeof(rpc_fraghdr) - svsk->sk_tcplen;
|
|
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 %d)\n", len, want);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
svsk->sk_reclen = ntohl(svsk->sk_reclen);
|
|
if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) {
|
|
/* 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. */
|
|
if (net_ratelimit())
|
|
printk(KERN_NOTICE "RPC: multiple fragments "
|
|
"per record not supported\n");
|
|
goto err_delete;
|
|
}
|
|
|
|
svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK;
|
|
dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen);
|
|
if (svsk->sk_reclen > serv->sv_max_mesg) {
|
|
if (net_ratelimit())
|
|
printk(KERN_NOTICE "RPC: "
|
|
"fragment too large: 0x%08lx\n",
|
|
(unsigned long)svsk->sk_reclen);
|
|
goto err_delete;
|
|
}
|
|
}
|
|
|
|
if (svsk->sk_reclen < 8)
|
|
goto err_delete; /* client is nuts. */
|
|
|
|
len = svsk->sk_reclen;
|
|
|
|
return len;
|
|
error:
|
|
dprintk("RPC: TCP recv_record got %d\n", len);
|
|
return len;
|
|
err_delete:
|
|
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
|
|
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)
|
|
req = xprt_lookup_rqst(bc_xprt, xid);
|
|
|
|
if (!req) {
|
|
printk(KERN_NOTICE
|
|
"%s: Got unrecognized reply: "
|
|
"calldir 0x%x xpt_bc_xprt %p xid %08x\n",
|
|
__func__, ntohl(calldir),
|
|
bc_xprt, xid);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
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)
|
|
return -EAGAIN; /* whatever; just giving up. */
|
|
memcpy(dst->iov_base, src->iov_base, src->iov_len);
|
|
xprt_complete_rqst(req->rq_task, svsk->sk_reclen);
|
|
rqstp->rq_arg.len = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len)
|
|
{
|
|
int i = 0;
|
|
int t = 0;
|
|
|
|
while (t < len) {
|
|
vec[i].iov_base = page_address(pages[i]);
|
|
vec[i].iov_len = PAGE_SIZE;
|
|
i++;
|
|
t += PAGE_SIZE;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
|
|
/*
|
|
* Receive data from a TCP socket.
|
|
*/
|
|
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;
|
|
int len;
|
|
struct kvec *vec;
|
|
unsigned int want, base;
|
|
__be32 *p;
|
|
__be32 calldir;
|
|
int pnum;
|
|
|
|
dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
|
|
svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
|
|
test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
|
|
test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
|
|
|
|
len = svc_tcp_recv_record(svsk, rqstp);
|
|
if (len < 0)
|
|
goto error;
|
|
|
|
base = svc_tcp_restore_pages(svsk, rqstp);
|
|
want = svsk->sk_reclen - base;
|
|
|
|
vec = rqstp->rq_vec;
|
|
|
|
pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
|
|
svsk->sk_reclen);
|
|
|
|
rqstp->rq_respages = &rqstp->rq_pages[pnum];
|
|
|
|
/* Now receive data */
|
|
len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
|
|
if (len >= 0)
|
|
svsk->sk_tcplen += len;
|
|
if (len != want) {
|
|
if (len < 0 && len != -EAGAIN)
|
|
goto err_other;
|
|
svc_tcp_save_pages(svsk, rqstp);
|
|
dprintk("svc: incomplete TCP record (%d of %d)\n",
|
|
svsk->sk_tcplen, svsk->sk_reclen);
|
|
goto err_noclose;
|
|
}
|
|
|
|
rqstp->rq_arg.len = svsk->sk_reclen;
|
|
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;
|
|
|
|
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_reclen = 0;
|
|
svsk->sk_tcplen = 0;
|
|
/* If we have more data, signal svc_xprt_enqueue() to try again */
|
|
if (svc_recv_available(svsk) > sizeof(rpc_fraghdr))
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
|
|
if (len < 0)
|
|
goto error;
|
|
|
|
svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
|
|
if (serv->sv_stats)
|
|
serv->sv_stats->nettcpcnt++;
|
|
|
|
dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len);
|
|
return rqstp->rq_arg.len;
|
|
|
|
error:
|
|
if (len != -EAGAIN)
|
|
goto err_other;
|
|
dprintk("RPC: TCP recvfrom got EAGAIN\n");
|
|
return -EAGAIN;
|
|
err_other:
|
|
printk(KERN_NOTICE "%s: recvfrom returned errno %d\n",
|
|
svsk->sk_xprt.xpt_server->sv_name, -len);
|
|
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
|
|
err_noclose:
|
|
return -EAGAIN; /* record not complete */
|
|
}
|
|
|
|
/*
|
|
* Send out data on TCP socket.
|
|
*/
|
|
static int svc_tcp_sendto(struct svc_rqst *rqstp)
|
|
{
|
|
struct xdr_buf *xbufp = &rqstp->rq_res;
|
|
int sent;
|
|
__be32 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);
|
|
|
|
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_xprt->xpt_server->sv_name,
|
|
(sent<0)?"got error":"sent only",
|
|
sent, xbufp->len);
|
|
set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags);
|
|
svc_xprt_enqueue(rqstp->rq_xprt);
|
|
sent = -EAGAIN;
|
|
}
|
|
return sent;
|
|
}
|
|
|
|
/*
|
|
* Setup response header. TCP has a 4B record length field.
|
|
*/
|
|
static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
|
|
{
|
|
struct kvec *resv = &rqstp->rq_res.head[0];
|
|
|
|
/* tcp needs a space for the record length... */
|
|
svc_putnl(resv, 0);
|
|
}
|
|
|
|
static int svc_tcp_has_wspace(struct svc_xprt *xprt)
|
|
{
|
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
|
|
struct svc_serv *serv = svsk->sk_xprt.xpt_server;
|
|
int required;
|
|
|
|
if (test_bit(XPT_LISTENER, &xprt->xpt_flags))
|
|
return 1;
|
|
required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg;
|
|
if (sk_stream_wspace(svsk->sk_sk) >= required)
|
|
return 1;
|
|
set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int,
|
|
struct net *, struct sockaddr *,
|
|
int, int);
|
|
static void svc_bc_sock_free(struct svc_xprt *xprt);
|
|
|
|
static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv,
|
|
struct net *net,
|
|
struct sockaddr *sa, int salen,
|
|
int flags)
|
|
{
|
|
return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags);
|
|
}
|
|
|
|
static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt)
|
|
{
|
|
}
|
|
|
|
static struct svc_xprt_ops svc_tcp_bc_ops = {
|
|
.xpo_create = svc_bc_tcp_create,
|
|
.xpo_detach = svc_bc_tcp_sock_detach,
|
|
.xpo_free = svc_bc_sock_free,
|
|
.xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
|
|
};
|
|
|
|
static struct svc_xprt_class svc_tcp_bc_class = {
|
|
.xcl_name = "tcp-bc",
|
|
.xcl_owner = THIS_MODULE,
|
|
.xcl_ops = &svc_tcp_bc_ops,
|
|
.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP,
|
|
};
|
|
|
|
static void svc_init_bc_xprt_sock(void)
|
|
{
|
|
svc_reg_xprt_class(&svc_tcp_bc_class);
|
|
}
|
|
|
|
static void svc_cleanup_bc_xprt_sock(void)
|
|
{
|
|
svc_unreg_xprt_class(&svc_tcp_bc_class);
|
|
}
|
|
#else /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
static void svc_init_bc_xprt_sock(void)
|
|
{
|
|
}
|
|
|
|
static void svc_cleanup_bc_xprt_sock(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
|
|
static struct svc_xprt_ops svc_tcp_ops = {
|
|
.xpo_create = svc_tcp_create,
|
|
.xpo_recvfrom = svc_tcp_recvfrom,
|
|
.xpo_sendto = svc_tcp_sendto,
|
|
.xpo_release_rqst = svc_release_skb,
|
|
.xpo_detach = svc_tcp_sock_detach,
|
|
.xpo_free = svc_sock_free,
|
|
.xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
|
|
.xpo_has_wspace = svc_tcp_has_wspace,
|
|
.xpo_accept = svc_tcp_accept,
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
void svc_init_xprt_sock(void)
|
|
{
|
|
svc_reg_xprt_class(&svc_tcp_class);
|
|
svc_reg_xprt_class(&svc_udp_class);
|
|
svc_init_bc_xprt_sock();
|
|
}
|
|
|
|
void svc_cleanup_xprt_sock(void)
|
|
{
|
|
svc_unreg_xprt_class(&svc_tcp_class);
|
|
svc_unreg_xprt_class(&svc_udp_class);
|
|
svc_cleanup_bc_xprt_sock();
|
|
}
|
|
|
|
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);
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
dprintk("setting up TCP socket for listening\n");
|
|
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 {
|
|
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_tcp_write_space;
|
|
|
|
svsk->sk_reclen = 0;
|
|
svsk->sk_tcplen = 0;
|
|
memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages));
|
|
|
|
tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
|
|
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_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 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);
|
|
list_for_each_entry(svsk, &serv->sv_tempsocks, 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
|
|
* 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 flags)
|
|
{
|
|
struct svc_sock *svsk;
|
|
struct sock *inet;
|
|
int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
|
|
|
|
dprintk("svc: svc_setup_socket %p\n", sock);
|
|
if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) {
|
|
*errp = -ENOMEM;
|
|
return NULL;
|
|
}
|
|
|
|
inet = sock->sk;
|
|
|
|
/* Register socket with portmapper */
|
|
if (*errp >= 0 && pmap_register)
|
|
*errp = svc_register(serv, inet->sk_family, inet->sk_protocol,
|
|
ntohs(inet_sk(inet)->inet_sport));
|
|
|
|
if (*errp < 0) {
|
|
kfree(svsk);
|
|
return NULL;
|
|
}
|
|
|
|
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;
|
|
|
|
/* Initialize the socket */
|
|
if (sock->type == SOCK_DGRAM)
|
|
svc_udp_init(svsk, serv);
|
|
else {
|
|
/* initialise setting must have enough space to
|
|
* receive and respond to one request.
|
|
*/
|
|
svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
|
|
4 * serv->sv_max_mesg);
|
|
svc_tcp_init(svsk, serv);
|
|
}
|
|
|
|
dprintk("svc: svc_setup_socket created %p (inet %p)\n",
|
|
svsk, svsk->sk_sk);
|
|
|
|
return svsk;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* 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)
|
|
{
|
|
int err = 0;
|
|
struct socket *so = sockfd_lookup(fd, &err);
|
|
struct svc_sock *svsk = NULL;
|
|
|
|
if (!so)
|
|
return err;
|
|
if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6))
|
|
err = -EAFNOSUPPORT;
|
|
else if (so->sk->sk_protocol != IPPROTO_TCP &&
|
|
so->sk->sk_protocol != IPPROTO_UDP)
|
|
err = -EPROTONOSUPPORT;
|
|
else if (so->state > SS_UNCONNECTED)
|
|
err = -EISCONN;
|
|
else {
|
|
if (!try_module_get(THIS_MODULE))
|
|
err = -ENOENT;
|
|
else
|
|
svsk = svc_setup_socket(serv, so, &err,
|
|
SVC_SOCK_DEFAULTS);
|
|
if (svsk) {
|
|
struct sockaddr_storage addr;
|
|
struct sockaddr *sin = (struct sockaddr *)&addr;
|
|
int salen;
|
|
if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
|
|
svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
|
|
clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags);
|
|
spin_lock_bh(&serv->sv_lock);
|
|
list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks);
|
|
spin_unlock_bh(&serv->sv_lock);
|
|
svc_xprt_received(&svsk->sk_xprt);
|
|
err = 0;
|
|
} else
|
|
module_put(THIS_MODULE);
|
|
}
|
|
if (err) {
|
|
sockfd_put(so);
|
|
return err;
|
|
}
|
|
return svc_one_sock_name(svsk, name_return, len);
|
|
}
|
|
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;
|
|
int val;
|
|
RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
|
|
|
|
dprintk("svc: svc_create_socket(%s, %d, %s)\n",
|
|
serv->sv_program->pg_name, protocol,
|
|
__svc_print_addr(sin, buf, sizeof(buf)));
|
|
|
|
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.
|
|
*/
|
|
val = 1;
|
|
if (family == PF_INET6)
|
|
kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY,
|
|
(char *)&val, sizeof(val));
|
|
|
|
if (type == SOCK_STREAM)
|
|
sock->sk->sk_reuse = 1; /* allow address reuse */
|
|
error = kernel_bind(sock, sin, len);
|
|
if (error < 0)
|
|
goto bummer;
|
|
|
|
newlen = len;
|
|
error = kernel_getsockname(sock, newsin, &newlen);
|
|
if (error < 0)
|
|
goto bummer;
|
|
|
|
if (protocol == IPPROTO_TCP) {
|
|
if ((error = kernel_listen(sock, 64)) < 0)
|
|
goto bummer;
|
|
}
|
|
|
|
if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) {
|
|
svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen);
|
|
return (struct svc_xprt *)svsk;
|
|
}
|
|
|
|
bummer:
|
|
dprintk("svc: svc_create_socket error = %d\n", -error);
|
|
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;
|
|
wait_queue_head_t *wq;
|
|
|
|
dprintk("svc: svc_sock_detach(%p)\n", svsk);
|
|
|
|
/* put back the old socket callbacks */
|
|
sk->sk_state_change = svsk->sk_ostate;
|
|
sk->sk_data_ready = svsk->sk_odata;
|
|
sk->sk_write_space = svsk->sk_owspace;
|
|
|
|
wq = sk_sleep(sk);
|
|
if (wq && waitqueue_active(wq))
|
|
wake_up_interruptible(wq);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
|
|
|
|
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);
|
|
dprintk("svc: svc_sock_free(%p)\n", svsk);
|
|
|
|
if (svsk->sk_sock->file)
|
|
sockfd_put(svsk->sk_sock);
|
|
else
|
|
sock_release(svsk->sk_sock);
|
|
kfree(svsk);
|
|
}
|
|
|
|
#if defined(CONFIG_SUNRPC_BACKCHANNEL)
|
|
/*
|
|
* Create a back channel svc_xprt which shares the fore channel socket.
|
|
*/
|
|
static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
|
|
int protocol,
|
|
struct net *net,
|
|
struct sockaddr *sin, int len,
|
|
int flags)
|
|
{
|
|
struct svc_sock *svsk;
|
|
struct svc_xprt *xprt;
|
|
|
|
if (protocol != IPPROTO_TCP) {
|
|
printk(KERN_WARNING "svc: only TCP sockets"
|
|
" supported on shared back channel\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
svsk = kzalloc(sizeof(*svsk), GFP_KERNEL);
|
|
if (!svsk)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
xprt = &svsk->sk_xprt;
|
|
svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
|
|
|
|
serv->sv_bc_xprt = xprt;
|
|
|
|
return xprt;
|
|
}
|
|
|
|
/*
|
|
* Free a back channel svc_sock.
|
|
*/
|
|
static void svc_bc_sock_free(struct svc_xprt *xprt)
|
|
{
|
|
if (xprt)
|
|
kfree(container_of(xprt, struct svc_sock, sk_xprt));
|
|
}
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|