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1538 lines
39 KiB
1538 lines
39 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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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 <[email protected]> |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/fcntl.h> |
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#include <linux/net.h> |
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#include <linux/in.h> |
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#include <linux/inet.h> |
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#include <linux/udp.h> |
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#include <linux/tcp.h> |
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#include <linux/unistd.h> |
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#include <linux/slab.h> |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/file.h> |
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#include <linux/freezer.h> |
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#include <net/sock.h> |
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#include <net/checksum.h> |
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#include <net/ip.h> |
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#include <net/ipv6.h> |
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#include <net/udp.h> |
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#include <net/tcp.h> |
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#include <net/tcp_states.h> |
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#include <linux/uaccess.h> |
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#include <linux/highmem.h> |
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#include <asm/ioctls.h> |
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|
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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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|
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#include <trace/events/sunrpc.h> |
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|
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#include "socklib.h" |
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#include "sunrpc.h" |
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|
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#define RPCDBG_FACILITY RPCDBG_SVCXPRT |
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|
|
|
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static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, |
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int flags); |
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static int svc_udp_recvfrom(struct svc_rqst *); |
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static int svc_udp_sendto(struct svc_rqst *); |
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static void svc_sock_detach(struct svc_xprt *); |
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static void svc_tcp_sock_detach(struct svc_xprt *); |
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static void svc_sock_free(struct svc_xprt *); |
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|
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static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
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struct net *, struct sockaddr *, |
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int, int); |
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#ifdef CONFIG_DEBUG_LOCK_ALLOC |
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static struct lock_class_key svc_key[2]; |
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static struct lock_class_key svc_slock_key[2]; |
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|
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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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|
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if (WARN_ON_ONCE(!sock_allow_reclassification(sk))) |
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return; |
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|
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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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|
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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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|
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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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/** |
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* svc_tcp_release_rqst - Release transport-related resources |
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* @rqstp: request structure with resources to be released |
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* |
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*/ |
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static void svc_tcp_release_rqst(struct svc_rqst *rqstp) |
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{ |
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struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
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|
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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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|
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rqstp->rq_xprt_ctxt = NULL; |
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skb_free_datagram_locked(svsk->sk_sk, skb); |
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} |
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} |
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|
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/** |
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* svc_udp_release_rqst - Release transport-related resources |
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* @rqstp: request structure with resources to be released |
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* |
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*/ |
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static void svc_udp_release_rqst(struct svc_rqst *rqstp) |
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{ |
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struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
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|
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if (skb) { |
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rqstp->rq_xprt_ctxt = NULL; |
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consume_skb(skb); |
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} |
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} |
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|
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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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|
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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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|
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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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|
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cmh->cmsg_level = SOL_IPV6; |
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cmh->cmsg_type = IPV6_PKTINFO; |
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pki->ipi6_ifindex = daddr->sin6_scope_id; |
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pki->ipi6_addr = daddr->sin6_addr; |
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cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
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} |
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break; |
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} |
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} |
|
|
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static int svc_sock_result_payload(struct svc_rqst *rqstp, unsigned int offset, |
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unsigned int length) |
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{ |
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return 0; |
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} |
|
|
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/* |
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* Report socket names for nfsdfs |
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*/ |
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static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
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{ |
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const struct sock *sk = svsk->sk_sk; |
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const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? |
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"udp" : "tcp"; |
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int len; |
|
|
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switch (sk->sk_family) { |
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case PF_INET: |
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len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", |
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proto_name, |
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&inet_sk(sk)->inet_rcv_saddr, |
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inet_sk(sk)->inet_num); |
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break; |
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#if IS_ENABLED(CONFIG_IPV6) |
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case PF_INET6: |
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len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", |
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proto_name, |
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&sk->sk_v6_rcv_saddr, |
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inet_sk(sk)->inet_num); |
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break; |
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#endif |
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default: |
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len = snprintf(buf, remaining, "*unknown-%d*\n", |
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sk->sk_family); |
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} |
|
|
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if (len >= remaining) { |
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*buf = '\0'; |
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return -ENAMETOOLONG; |
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} |
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return len; |
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} |
|
|
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#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
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static void svc_flush_bvec(const struct bio_vec *bvec, size_t size, size_t seek) |
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{ |
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struct bvec_iter bi = { |
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.bi_size = size + seek, |
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}; |
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struct bio_vec bv; |
|
|
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bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); |
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for_each_bvec(bv, bvec, bi, bi) |
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flush_dcache_page(bv.bv_page); |
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} |
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#else |
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static inline void svc_flush_bvec(const struct bio_vec *bvec, size_t size, |
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size_t seek) |
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{ |
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} |
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#endif |
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|
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/* |
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* Read from @rqstp's transport socket. The incoming message fills whole |
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* pages in @rqstp's rq_pages array until the last page of the message |
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* has been received into a partial page. |
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*/ |
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static ssize_t svc_tcp_read_msg(struct svc_rqst *rqstp, size_t buflen, |
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size_t seek) |
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{ |
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struct svc_sock *svsk = |
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container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
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struct bio_vec *bvec = rqstp->rq_bvec; |
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struct msghdr msg = { NULL }; |
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unsigned int i; |
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ssize_t len; |
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size_t t; |
|
|
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rqstp->rq_xprt_hlen = 0; |
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|
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clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
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|
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for (i = 0, t = 0; t < buflen; i++, t += PAGE_SIZE) { |
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bvec[i].bv_page = rqstp->rq_pages[i]; |
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bvec[i].bv_len = PAGE_SIZE; |
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bvec[i].bv_offset = 0; |
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} |
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rqstp->rq_respages = &rqstp->rq_pages[i]; |
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rqstp->rq_next_page = rqstp->rq_respages + 1; |
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|
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iov_iter_bvec(&msg.msg_iter, READ, bvec, i, buflen); |
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if (seek) { |
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iov_iter_advance(&msg.msg_iter, seek); |
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buflen -= seek; |
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} |
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len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT); |
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if (len > 0) |
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svc_flush_bvec(bvec, len, seek); |
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|
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/* If we read a full record, then assume there may be more |
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* data to read (stream based sockets only!) |
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*/ |
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if (len == buflen) |
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set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
|
|
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return len; |
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} |
|
|
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/* |
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* Set socket snd and rcv buffer lengths |
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*/ |
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static void svc_sock_setbufsize(struct svc_sock *svsk, unsigned int nreqs) |
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{ |
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unsigned int max_mesg = svsk->sk_xprt.xpt_server->sv_max_mesg; |
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struct socket *sock = svsk->sk_sock; |
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|
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nreqs = min(nreqs, INT_MAX / 2 / max_mesg); |
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|
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lock_sock(sock->sk); |
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sock->sk->sk_sndbuf = nreqs * max_mesg * 2; |
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sock->sk->sk_rcvbuf = nreqs * max_mesg * 2; |
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sock->sk->sk_write_space(sock->sk); |
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release_sock(sock->sk); |
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} |
|
|
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static void svc_sock_secure_port(struct svc_rqst *rqstp) |
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{ |
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if (svc_port_is_privileged(svc_addr(rqstp))) |
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set_bit(RQ_SECURE, &rqstp->rq_flags); |
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else |
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clear_bit(RQ_SECURE, &rqstp->rq_flags); |
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} |
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|
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/* |
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* INET callback when data has been received on the socket. |
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*/ |
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static void svc_data_ready(struct sock *sk) |
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{ |
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struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
|
|
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if (svsk) { |
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/* Refer to svc_setup_socket() for details. */ |
|
rmb(); |
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svsk->sk_odata(sk); |
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trace_svcsock_data_ready(&svsk->sk_xprt, 0); |
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if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags)) |
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svc_xprt_enqueue(&svsk->sk_xprt); |
|
} |
|
} |
|
|
|
/* |
|
* 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) { |
|
/* Refer to svc_setup_socket() for details. */ |
|
rmb(); |
|
trace_svcsock_write_space(&svsk->sk_xprt, 0); |
|
svsk->sk_owspace(sk); |
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svc_xprt_enqueue(&svsk->sk_xprt); |
|
} |
|
} |
|
|
|
static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
|
{ |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
|
|
if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
|
return 1; |
|
return !test_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
|
} |
|
|
|
static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt) |
|
{ |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
|
|
sock_no_linger(svsk->sk_sock->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 : ip6_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; |
|
} |
|
|
|
/** |
|
* svc_udp_recvfrom - Receive a datagram from a UDP socket. |
|
* @rqstp: request structure into which to receive an RPC Call |
|
* |
|
* Called in a loop when XPT_DATA has been set. |
|
* |
|
* Returns: |
|
* On success, the number of bytes in a received RPC Call, or |
|
* %0 if a complete RPC Call message was not ready to return |
|
*/ |
|
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, serv->sv_nrthreads + 3); |
|
|
|
clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
|
err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, |
|
0, 0, MSG_PEEK | MSG_DONTWAIT); |
|
if (err < 0) |
|
goto out_recv_err; |
|
skb = skb_recv_udp(svsk->sk_sk, 0, 1, &err); |
|
if (!skb) |
|
goto out_recv_err; |
|
|
|
len = svc_addr_len(svc_addr(rqstp)); |
|
rqstp->rq_addrlen = len; |
|
if (skb->tstamp == 0) { |
|
skb->tstamp = ktime_get_real(); |
|
/* Don't enable netstamp, sunrpc doesn't |
|
need that much accuracy */ |
|
} |
|
sock_write_timestamp(svsk->sk_sk, skb->tstamp); |
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
|
|
|
len = skb->len; |
|
rqstp->rq_arg.len = len; |
|
trace_svcsock_udp_recv(&svsk->sk_xprt, len); |
|
|
|
rqstp->rq_prot = IPPROTO_UDP; |
|
|
|
if (!svc_udp_get_dest_address(rqstp, cmh)) |
|
goto out_cmsg_err; |
|
rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
|
|
|
if (skb_is_nonlinear(skb)) { |
|
/* we have to copy */ |
|
local_bh_disable(); |
|
if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) |
|
goto out_bh_enable; |
|
local_bh_enable(); |
|
consume_skb(skb); |
|
} else { |
|
/* we can use it in-place */ |
|
rqstp->rq_arg.head[0].iov_base = skb->data; |
|
rqstp->rq_arg.head[0].iov_len = len; |
|
if (skb_checksum_complete(skb)) |
|
goto out_free; |
|
rqstp->rq_xprt_ctxt = skb; |
|
} |
|
|
|
rqstp->rq_arg.page_base = 0; |
|
if (len <= rqstp->rq_arg.head[0].iov_len) { |
|
rqstp->rq_arg.head[0].iov_len = len; |
|
rqstp->rq_arg.page_len = 0; |
|
rqstp->rq_respages = rqstp->rq_pages+1; |
|
} else { |
|
rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; |
|
rqstp->rq_respages = rqstp->rq_pages + 1 + |
|
DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
|
} |
|
rqstp->rq_next_page = rqstp->rq_respages+1; |
|
|
|
if (serv->sv_stats) |
|
serv->sv_stats->netudpcnt++; |
|
|
|
svc_xprt_received(rqstp->rq_xprt); |
|
return len; |
|
|
|
out_recv_err: |
|
if (err != -EAGAIN) { |
|
/* possibly an icmp error */ |
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
|
} |
|
trace_svcsock_udp_recv_err(&svsk->sk_xprt, err); |
|
goto out_clear_busy; |
|
out_cmsg_err: |
|
net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", |
|
cmh->cmsg_level, cmh->cmsg_type); |
|
goto out_free; |
|
out_bh_enable: |
|
local_bh_enable(); |
|
out_free: |
|
kfree_skb(skb); |
|
out_clear_busy: |
|
svc_xprt_received(rqstp->rq_xprt); |
|
return 0; |
|
} |
|
|
|
/** |
|
* svc_udp_sendto - Send out a reply on a UDP socket |
|
* @rqstp: completed svc_rqst |
|
* |
|
* xpt_mutex ensures @rqstp's whole message is written to the socket |
|
* without interruption. |
|
* |
|
* Returns the number of bytes sent, or a negative errno. |
|
*/ |
|
static int svc_udp_sendto(struct svc_rqst *rqstp) |
|
{ |
|
struct svc_xprt *xprt = rqstp->rq_xprt; |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
struct xdr_buf *xdr = &rqstp->rq_res; |
|
union { |
|
struct cmsghdr hdr; |
|
long all[SVC_PKTINFO_SPACE / sizeof(long)]; |
|
} buffer; |
|
struct cmsghdr *cmh = &buffer.hdr; |
|
struct msghdr msg = { |
|
.msg_name = &rqstp->rq_addr, |
|
.msg_namelen = rqstp->rq_addrlen, |
|
.msg_control = cmh, |
|
.msg_controllen = sizeof(buffer), |
|
}; |
|
unsigned int sent; |
|
int err; |
|
|
|
svc_udp_release_rqst(rqstp); |
|
|
|
svc_set_cmsg_data(rqstp, cmh); |
|
|
|
mutex_lock(&xprt->xpt_mutex); |
|
|
|
if (svc_xprt_is_dead(xprt)) |
|
goto out_notconn; |
|
|
|
err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent); |
|
xdr_free_bvec(xdr); |
|
if (err == -ECONNREFUSED) { |
|
/* ICMP error on earlier request. */ |
|
err = xprt_sock_sendmsg(svsk->sk_sock, &msg, xdr, 0, 0, &sent); |
|
xdr_free_bvec(xdr); |
|
} |
|
trace_svcsock_udp_send(xprt, err); |
|
|
|
mutex_unlock(&xprt->xpt_mutex); |
|
if (err < 0) |
|
return err; |
|
return sent; |
|
|
|
out_notconn: |
|
mutex_unlock(&xprt->xpt_mutex); |
|
return -ENOTCONN; |
|
} |
|
|
|
static int svc_udp_has_wspace(struct svc_xprt *xprt) |
|
{ |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
struct svc_serv *serv = xprt->xpt_server; |
|
unsigned long required; |
|
|
|
/* |
|
* Set the SOCK_NOSPACE flag before checking the available |
|
* sock space. |
|
*/ |
|
set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
|
required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
|
if (required*2 > sock_wspace(svsk->sk_sk)) |
|
return 0; |
|
clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
|
return 1; |
|
} |
|
|
|
static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
|
{ |
|
BUG(); |
|
return NULL; |
|
} |
|
|
|
static void svc_udp_kill_temp_xprt(struct svc_xprt *xprt) |
|
{ |
|
} |
|
|
|
static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
|
struct net *net, |
|
struct sockaddr *sa, int salen, |
|
int flags) |
|
{ |
|
return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
|
} |
|
|
|
static const struct svc_xprt_ops svc_udp_ops = { |
|
.xpo_create = svc_udp_create, |
|
.xpo_recvfrom = svc_udp_recvfrom, |
|
.xpo_sendto = svc_udp_sendto, |
|
.xpo_result_payload = svc_sock_result_payload, |
|
.xpo_release_rqst = svc_udp_release_rqst, |
|
.xpo_detach = svc_sock_detach, |
|
.xpo_free = svc_sock_free, |
|
.xpo_has_wspace = svc_udp_has_wspace, |
|
.xpo_accept = svc_udp_accept, |
|
.xpo_secure_port = svc_sock_secure_port, |
|
.xpo_kill_temp_xprt = svc_udp_kill_temp_xprt, |
|
}; |
|
|
|
static struct svc_xprt_class svc_udp_class = { |
|
.xcl_name = "udp", |
|
.xcl_owner = THIS_MODULE, |
|
.xcl_ops = &svc_udp_ops, |
|
.xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
|
.xcl_ident = XPRT_TRANSPORT_UDP, |
|
}; |
|
|
|
static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
|
{ |
|
svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
|
&svsk->sk_xprt, serv); |
|
clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
|
svsk->sk_sk->sk_data_ready = svc_data_ready; |
|
svsk->sk_sk->sk_write_space = svc_write_space; |
|
|
|
/* initialise setting must have enough space to |
|
* receive and respond to one request. |
|
* svc_udp_recvfrom will re-adjust if necessary |
|
*/ |
|
svc_sock_setbufsize(svsk, 3); |
|
|
|
/* data might have come in before data_ready set up */ |
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
|
set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
|
|
|
/* make sure we get destination address info */ |
|
switch (svsk->sk_sk->sk_family) { |
|
case AF_INET: |
|
ip_sock_set_pktinfo(svsk->sk_sock->sk); |
|
break; |
|
case AF_INET6: |
|
ip6_sock_set_recvpktinfo(svsk->sk_sock->sk); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
/* |
|
* A data_ready event on a listening socket means there's a connection |
|
* pending. Do not use state_change as a substitute for it. |
|
*/ |
|
static void svc_tcp_listen_data_ready(struct sock *sk) |
|
{ |
|
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
|
|
|
if (svsk) { |
|
/* Refer to svc_setup_socket() for details. */ |
|
rmb(); |
|
svsk->sk_odata(sk); |
|
} |
|
|
|
/* |
|
* This callback may called twice when a new connection |
|
* is established as a child socket inherits everything |
|
* from a parent LISTEN socket. |
|
* 1) data_ready method of the parent socket will be called |
|
* when one of child sockets become ESTABLISHED. |
|
* 2) data_ready method of the child socket may be called |
|
* when it receives data before the socket is accepted. |
|
* In case of 2, we should ignore it silently. |
|
*/ |
|
if (sk->sk_state == TCP_LISTEN) { |
|
if (svsk) { |
|
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
|
svc_xprt_enqueue(&svsk->sk_xprt); |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* A state change on a connected socket means it's dying or dead. |
|
*/ |
|
static void svc_tcp_state_change(struct sock *sk) |
|
{ |
|
struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
|
|
|
if (svsk) { |
|
/* Refer to svc_setup_socket() for details. */ |
|
rmb(); |
|
svsk->sk_ostate(sk); |
|
trace_svcsock_tcp_state(&svsk->sk_xprt, svsk->sk_sock); |
|
if (sk->sk_state != TCP_ESTABLISHED) |
|
svc_xprt_deferred_close(&svsk->sk_xprt); |
|
} |
|
} |
|
|
|
/* |
|
* Accept a TCP connection |
|
*/ |
|
static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
|
{ |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
struct sockaddr_storage addr; |
|
struct sockaddr *sin = (struct sockaddr *) &addr; |
|
struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
|
struct socket *sock = svsk->sk_sock; |
|
struct socket *newsock; |
|
struct svc_sock *newsvsk; |
|
int err, slen; |
|
|
|
if (!sock) |
|
return NULL; |
|
|
|
clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
|
err = kernel_accept(sock, &newsock, O_NONBLOCK); |
|
if (err < 0) { |
|
if (err == -ENOMEM) |
|
printk(KERN_WARNING "%s: no more sockets!\n", |
|
serv->sv_name); |
|
else if (err != -EAGAIN) |
|
net_warn_ratelimited("%s: accept failed (err %d)!\n", |
|
serv->sv_name, -err); |
|
trace_svcsock_accept_err(xprt, serv->sv_name, err); |
|
return NULL; |
|
} |
|
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
|
|
|
err = kernel_getpeername(newsock, sin); |
|
if (err < 0) { |
|
trace_svcsock_getpeername_err(xprt, serv->sv_name, err); |
|
goto failed; /* aborted connection or whatever */ |
|
} |
|
slen = err; |
|
|
|
/* Reset the inherited callbacks before calling svc_setup_socket */ |
|
newsock->sk->sk_state_change = svsk->sk_ostate; |
|
newsock->sk->sk_data_ready = svsk->sk_odata; |
|
newsock->sk->sk_write_space = svsk->sk_owspace; |
|
|
|
/* make sure that a write doesn't block forever when |
|
* low on memory |
|
*/ |
|
newsock->sk->sk_sndtimeo = HZ*30; |
|
|
|
newsvsk = svc_setup_socket(serv, newsock, |
|
(SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)); |
|
if (IS_ERR(newsvsk)) |
|
goto failed; |
|
svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
|
err = kernel_getsockname(newsock, sin); |
|
slen = err; |
|
if (unlikely(err < 0)) |
|
slen = offsetof(struct sockaddr, sa_data); |
|
svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
|
|
|
if (sock_is_loopback(newsock->sk)) |
|
set_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); |
|
else |
|
clear_bit(XPT_LOCAL, &newsvsk->sk_xprt.xpt_flags); |
|
if (serv->sv_stats) |
|
serv->sv_stats->nettcpconn++; |
|
|
|
return &newsvsk->sk_xprt; |
|
|
|
failed: |
|
sock_release(newsock); |
|
return NULL; |
|
} |
|
|
|
static size_t svc_tcp_restore_pages(struct svc_sock *svsk, |
|
struct svc_rqst *rqstp) |
|
{ |
|
size_t len = svsk->sk_datalen; |
|
unsigned int i, npages; |
|
|
|
if (!len) |
|
return 0; |
|
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
|
for (i = 0; i < npages; i++) { |
|
if (rqstp->rq_pages[i] != NULL) |
|
put_page(rqstp->rq_pages[i]); |
|
BUG_ON(svsk->sk_pages[i] == NULL); |
|
rqstp->rq_pages[i] = svsk->sk_pages[i]; |
|
svsk->sk_pages[i] = NULL; |
|
} |
|
rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); |
|
return len; |
|
} |
|
|
|
static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
|
{ |
|
unsigned int i, len, npages; |
|
|
|
if (svsk->sk_datalen == 0) |
|
return; |
|
len = svsk->sk_datalen; |
|
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
|
for (i = 0; i < npages; i++) { |
|
svsk->sk_pages[i] = rqstp->rq_pages[i]; |
|
rqstp->rq_pages[i] = NULL; |
|
} |
|
} |
|
|
|
static void svc_tcp_clear_pages(struct svc_sock *svsk) |
|
{ |
|
unsigned int i, len, npages; |
|
|
|
if (svsk->sk_datalen == 0) |
|
goto out; |
|
len = svsk->sk_datalen; |
|
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
|
for (i = 0; i < npages; i++) { |
|
if (svsk->sk_pages[i] == NULL) { |
|
WARN_ON_ONCE(1); |
|
continue; |
|
} |
|
put_page(svsk->sk_pages[i]); |
|
svsk->sk_pages[i] = NULL; |
|
} |
|
out: |
|
svsk->sk_tcplen = 0; |
|
svsk->sk_datalen = 0; |
|
} |
|
|
|
/* |
|
* Receive fragment record header into sk_marker. |
|
*/ |
|
static ssize_t svc_tcp_read_marker(struct svc_sock *svsk, |
|
struct svc_rqst *rqstp) |
|
{ |
|
ssize_t want, len; |
|
|
|
/* If we haven't gotten the record length yet, |
|
* get the next four bytes. |
|
*/ |
|
if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
|
struct msghdr msg = { NULL }; |
|
struct kvec iov; |
|
|
|
want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
|
iov.iov_base = ((char *)&svsk->sk_marker) + svsk->sk_tcplen; |
|
iov.iov_len = want; |
|
iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, want); |
|
len = sock_recvmsg(svsk->sk_sock, &msg, MSG_DONTWAIT); |
|
if (len < 0) |
|
return len; |
|
svsk->sk_tcplen += len; |
|
if (len < want) { |
|
/* call again to read the remaining bytes */ |
|
goto err_short; |
|
} |
|
trace_svcsock_marker(&svsk->sk_xprt, svsk->sk_marker); |
|
if (svc_sock_reclen(svsk) + svsk->sk_datalen > |
|
svsk->sk_xprt.xpt_server->sv_max_mesg) |
|
goto err_too_large; |
|
} |
|
return svc_sock_reclen(svsk); |
|
|
|
err_too_large: |
|
net_notice_ratelimited("svc: %s %s RPC fragment too large: %d\n", |
|
__func__, svsk->sk_xprt.xpt_server->sv_name, |
|
svc_sock_reclen(svsk)); |
|
svc_xprt_deferred_close(&svsk->sk_xprt); |
|
err_short: |
|
return -EAGAIN; |
|
} |
|
|
|
static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
|
{ |
|
struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
|
struct rpc_rqst *req = NULL; |
|
struct kvec *src, *dst; |
|
__be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
|
__be32 xid; |
|
__be32 calldir; |
|
|
|
xid = *p++; |
|
calldir = *p; |
|
|
|
if (!bc_xprt) |
|
return -EAGAIN; |
|
spin_lock(&bc_xprt->queue_lock); |
|
req = xprt_lookup_rqst(bc_xprt, xid); |
|
if (!req) |
|
goto unlock_notfound; |
|
|
|
memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); |
|
/* |
|
* XXX!: cheating for now! Only copying HEAD. |
|
* But we know this is good enough for now (in fact, for any |
|
* callback reply in the forseeable future). |
|
*/ |
|
dst = &req->rq_private_buf.head[0]; |
|
src = &rqstp->rq_arg.head[0]; |
|
if (dst->iov_len < src->iov_len) |
|
goto unlock_eagain; /* whatever; just giving up. */ |
|
memcpy(dst->iov_base, src->iov_base, src->iov_len); |
|
xprt_complete_rqst(req->rq_task, rqstp->rq_arg.len); |
|
rqstp->rq_arg.len = 0; |
|
spin_unlock(&bc_xprt->queue_lock); |
|
return 0; |
|
unlock_notfound: |
|
printk(KERN_NOTICE |
|
"%s: Got unrecognized reply: " |
|
"calldir 0x%x xpt_bc_xprt %p xid %08x\n", |
|
__func__, ntohl(calldir), |
|
bc_xprt, ntohl(xid)); |
|
unlock_eagain: |
|
spin_unlock(&bc_xprt->queue_lock); |
|
return -EAGAIN; |
|
} |
|
|
|
static void svc_tcp_fragment_received(struct svc_sock *svsk) |
|
{ |
|
/* If we have more data, signal svc_xprt_enqueue() to try again */ |
|
svsk->sk_tcplen = 0; |
|
svsk->sk_marker = xdr_zero; |
|
} |
|
|
|
/** |
|
* svc_tcp_recvfrom - Receive data from a TCP socket |
|
* @rqstp: request structure into which to receive an RPC Call |
|
* |
|
* Called in a loop when XPT_DATA has been set. |
|
* |
|
* Read the 4-byte stream record marker, then use the record length |
|
* in that marker to set up exactly the resources needed to receive |
|
* the next RPC message into @rqstp. |
|
* |
|
* Returns: |
|
* On success, the number of bytes in a received RPC Call, or |
|
* %0 if a complete RPC Call message was not ready to return |
|
* |
|
* The zero return case handles partial receives and callback Replies. |
|
* The state of a partial receive is preserved in the svc_sock for |
|
* the next call to svc_tcp_recvfrom. |
|
*/ |
|
static int svc_tcp_recvfrom(struct svc_rqst *rqstp) |
|
{ |
|
struct svc_sock *svsk = |
|
container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
|
struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
|
size_t want, base; |
|
ssize_t len; |
|
__be32 *p; |
|
__be32 calldir; |
|
|
|
clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
|
len = svc_tcp_read_marker(svsk, rqstp); |
|
if (len < 0) |
|
goto error; |
|
|
|
base = svc_tcp_restore_pages(svsk, rqstp); |
|
want = len - (svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
|
len = svc_tcp_read_msg(rqstp, base + want, base); |
|
if (len >= 0) { |
|
trace_svcsock_tcp_recv(&svsk->sk_xprt, len); |
|
svsk->sk_tcplen += len; |
|
svsk->sk_datalen += len; |
|
} |
|
if (len != want || !svc_sock_final_rec(svsk)) |
|
goto err_incomplete; |
|
if (svsk->sk_datalen < 8) |
|
goto err_nuts; |
|
|
|
rqstp->rq_arg.len = svsk->sk_datalen; |
|
rqstp->rq_arg.page_base = 0; |
|
if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
|
rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; |
|
rqstp->rq_arg.page_len = 0; |
|
} else |
|
rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; |
|
|
|
rqstp->rq_xprt_ctxt = NULL; |
|
rqstp->rq_prot = IPPROTO_TCP; |
|
if (test_bit(XPT_LOCAL, &svsk->sk_xprt.xpt_flags)) |
|
set_bit(RQ_LOCAL, &rqstp->rq_flags); |
|
else |
|
clear_bit(RQ_LOCAL, &rqstp->rq_flags); |
|
|
|
p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
|
calldir = p[1]; |
|
if (calldir) |
|
len = receive_cb_reply(svsk, rqstp); |
|
|
|
/* Reset TCP read info */ |
|
svsk->sk_datalen = 0; |
|
svc_tcp_fragment_received(svsk); |
|
|
|
if (len < 0) |
|
goto error; |
|
|
|
svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
|
if (serv->sv_stats) |
|
serv->sv_stats->nettcpcnt++; |
|
|
|
svc_xprt_received(rqstp->rq_xprt); |
|
return rqstp->rq_arg.len; |
|
|
|
err_incomplete: |
|
svc_tcp_save_pages(svsk, rqstp); |
|
if (len < 0 && len != -EAGAIN) |
|
goto err_delete; |
|
if (len == want) |
|
svc_tcp_fragment_received(svsk); |
|
else |
|
trace_svcsock_tcp_recv_short(&svsk->sk_xprt, |
|
svc_sock_reclen(svsk), |
|
svsk->sk_tcplen - sizeof(rpc_fraghdr)); |
|
goto err_noclose; |
|
error: |
|
if (len != -EAGAIN) |
|
goto err_delete; |
|
trace_svcsock_tcp_recv_eagain(&svsk->sk_xprt, 0); |
|
goto err_noclose; |
|
err_nuts: |
|
svsk->sk_datalen = 0; |
|
err_delete: |
|
trace_svcsock_tcp_recv_err(&svsk->sk_xprt, len); |
|
svc_xprt_deferred_close(&svsk->sk_xprt); |
|
err_noclose: |
|
svc_xprt_received(rqstp->rq_xprt); |
|
return 0; /* record not complete */ |
|
} |
|
|
|
static int svc_tcp_send_kvec(struct socket *sock, const struct kvec *vec, |
|
int flags) |
|
{ |
|
return kernel_sendpage(sock, virt_to_page(vec->iov_base), |
|
offset_in_page(vec->iov_base), |
|
vec->iov_len, flags); |
|
} |
|
|
|
/* |
|
* kernel_sendpage() is used exclusively to reduce the number of |
|
* copy operations in this path. Therefore the caller must ensure |
|
* that the pages backing @xdr are unchanging. |
|
* |
|
* In addition, the logic assumes that * .bv_len is never larger |
|
* than PAGE_SIZE. |
|
*/ |
|
static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr, |
|
rpc_fraghdr marker, unsigned int *sentp) |
|
{ |
|
const struct kvec *head = xdr->head; |
|
const struct kvec *tail = xdr->tail; |
|
struct kvec rm = { |
|
.iov_base = &marker, |
|
.iov_len = sizeof(marker), |
|
}; |
|
struct msghdr msg = { |
|
.msg_flags = 0, |
|
}; |
|
int ret; |
|
|
|
*sentp = 0; |
|
xdr_alloc_bvec(xdr, GFP_KERNEL); |
|
|
|
ret = kernel_sendmsg(sock, &msg, &rm, 1, rm.iov_len); |
|
if (ret < 0) |
|
return ret; |
|
*sentp += ret; |
|
if (ret != rm.iov_len) |
|
return -EAGAIN; |
|
|
|
ret = svc_tcp_send_kvec(sock, head, 0); |
|
if (ret < 0) |
|
return ret; |
|
*sentp += ret; |
|
if (ret != head->iov_len) |
|
goto out; |
|
|
|
if (xdr->page_len) { |
|
unsigned int offset, len, remaining; |
|
struct bio_vec *bvec; |
|
|
|
bvec = xdr->bvec + (xdr->page_base >> PAGE_SHIFT); |
|
offset = offset_in_page(xdr->page_base); |
|
remaining = xdr->page_len; |
|
while (remaining > 0) { |
|
len = min(remaining, bvec->bv_len - offset); |
|
ret = kernel_sendpage(sock, bvec->bv_page, |
|
bvec->bv_offset + offset, |
|
len, 0); |
|
if (ret < 0) |
|
return ret; |
|
*sentp += ret; |
|
if (ret != len) |
|
goto out; |
|
remaining -= len; |
|
offset = 0; |
|
bvec++; |
|
} |
|
} |
|
|
|
if (tail->iov_len) { |
|
ret = svc_tcp_send_kvec(sock, tail, 0); |
|
if (ret < 0) |
|
return ret; |
|
*sentp += ret; |
|
} |
|
|
|
out: |
|
return 0; |
|
} |
|
|
|
/** |
|
* svc_tcp_sendto - Send out a reply on a TCP socket |
|
* @rqstp: completed svc_rqst |
|
* |
|
* xpt_mutex ensures @rqstp's whole message is written to the socket |
|
* without interruption. |
|
* |
|
* Returns the number of bytes sent, or a negative errno. |
|
*/ |
|
static int svc_tcp_sendto(struct svc_rqst *rqstp) |
|
{ |
|
struct svc_xprt *xprt = rqstp->rq_xprt; |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
struct xdr_buf *xdr = &rqstp->rq_res; |
|
rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | |
|
(u32)xdr->len); |
|
unsigned int sent; |
|
int err; |
|
|
|
svc_tcp_release_rqst(rqstp); |
|
|
|
atomic_inc(&svsk->sk_sendqlen); |
|
mutex_lock(&xprt->xpt_mutex); |
|
if (svc_xprt_is_dead(xprt)) |
|
goto out_notconn; |
|
tcp_sock_set_cork(svsk->sk_sk, true); |
|
err = svc_tcp_sendmsg(svsk->sk_sock, xdr, marker, &sent); |
|
xdr_free_bvec(xdr); |
|
trace_svcsock_tcp_send(xprt, err < 0 ? (long)err : sent); |
|
if (err < 0 || sent != (xdr->len + sizeof(marker))) |
|
goto out_close; |
|
if (atomic_dec_and_test(&svsk->sk_sendqlen)) |
|
tcp_sock_set_cork(svsk->sk_sk, false); |
|
mutex_unlock(&xprt->xpt_mutex); |
|
return sent; |
|
|
|
out_notconn: |
|
atomic_dec(&svsk->sk_sendqlen); |
|
mutex_unlock(&xprt->xpt_mutex); |
|
return -ENOTCONN; |
|
out_close: |
|
pr_notice("rpc-srv/tcp: %s: %s %d when sending %d bytes - shutting down socket\n", |
|
xprt->xpt_server->sv_name, |
|
(err < 0) ? "got error" : "sent", |
|
(err < 0) ? err : sent, xdr->len); |
|
svc_xprt_deferred_close(xprt); |
|
atomic_dec(&svsk->sk_sendqlen); |
|
mutex_unlock(&xprt->xpt_mutex); |
|
return -EAGAIN; |
|
} |
|
|
|
static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
|
struct net *net, |
|
struct sockaddr *sa, int salen, |
|
int flags) |
|
{ |
|
return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
|
} |
|
|
|
static const struct svc_xprt_ops svc_tcp_ops = { |
|
.xpo_create = svc_tcp_create, |
|
.xpo_recvfrom = svc_tcp_recvfrom, |
|
.xpo_sendto = svc_tcp_sendto, |
|
.xpo_result_payload = svc_sock_result_payload, |
|
.xpo_release_rqst = svc_tcp_release_rqst, |
|
.xpo_detach = svc_tcp_sock_detach, |
|
.xpo_free = svc_sock_free, |
|
.xpo_has_wspace = svc_tcp_has_wspace, |
|
.xpo_accept = svc_tcp_accept, |
|
.xpo_secure_port = svc_sock_secure_port, |
|
.xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt, |
|
}; |
|
|
|
static struct svc_xprt_class svc_tcp_class = { |
|
.xcl_name = "tcp", |
|
.xcl_owner = THIS_MODULE, |
|
.xcl_ops = &svc_tcp_ops, |
|
.xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
|
.xcl_ident = XPRT_TRANSPORT_TCP, |
|
}; |
|
|
|
void svc_init_xprt_sock(void) |
|
{ |
|
svc_reg_xprt_class(&svc_tcp_class); |
|
svc_reg_xprt_class(&svc_udp_class); |
|
} |
|
|
|
void svc_cleanup_xprt_sock(void) |
|
{ |
|
svc_unreg_xprt_class(&svc_tcp_class); |
|
svc_unreg_xprt_class(&svc_udp_class); |
|
} |
|
|
|
static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
|
{ |
|
struct sock *sk = svsk->sk_sk; |
|
|
|
svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
|
&svsk->sk_xprt, serv); |
|
set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
|
set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); |
|
if (sk->sk_state == TCP_LISTEN) { |
|
strcpy(svsk->sk_xprt.xpt_remotebuf, "listener"); |
|
set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
|
sk->sk_data_ready = svc_tcp_listen_data_ready; |
|
set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
|
} else { |
|
sk->sk_state_change = svc_tcp_state_change; |
|
sk->sk_data_ready = svc_data_ready; |
|
sk->sk_write_space = svc_write_space; |
|
|
|
svsk->sk_marker = xdr_zero; |
|
svsk->sk_tcplen = 0; |
|
svsk->sk_datalen = 0; |
|
memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
|
|
|
tcp_sock_set_nodelay(sk); |
|
|
|
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
|
switch (sk->sk_state) { |
|
case TCP_SYN_RECV: |
|
case TCP_ESTABLISHED: |
|
break; |
|
default: |
|
svc_xprt_deferred_close(&svsk->sk_xprt); |
|
} |
|
} |
|
} |
|
|
|
void svc_sock_update_bufs(struct svc_serv *serv) |
|
{ |
|
/* |
|
* The number of server threads has changed. Update |
|
* rcvbuf and sndbuf accordingly on all sockets |
|
*/ |
|
struct svc_sock *svsk; |
|
|
|
spin_lock_bh(&serv->sv_lock); |
|
list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
|
set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
|
spin_unlock_bh(&serv->sv_lock); |
|
} |
|
EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
|
|
|
/* |
|
* Initialize socket for RPC use and create svc_sock struct |
|
*/ |
|
static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
|
struct socket *sock, |
|
int flags) |
|
{ |
|
struct svc_sock *svsk; |
|
struct sock *inet; |
|
int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
|
int err = 0; |
|
|
|
svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
|
if (!svsk) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
inet = sock->sk; |
|
|
|
/* Register socket with portmapper */ |
|
if (pmap_register) |
|
err = svc_register(serv, sock_net(sock->sk), inet->sk_family, |
|
inet->sk_protocol, |
|
ntohs(inet_sk(inet)->inet_sport)); |
|
|
|
if (err < 0) { |
|
kfree(svsk); |
|
return ERR_PTR(err); |
|
} |
|
|
|
svsk->sk_sock = sock; |
|
svsk->sk_sk = inet; |
|
svsk->sk_ostate = inet->sk_state_change; |
|
svsk->sk_odata = inet->sk_data_ready; |
|
svsk->sk_owspace = inet->sk_write_space; |
|
/* |
|
* This barrier is necessary in order to prevent race condition |
|
* with svc_data_ready(), svc_listen_data_ready() and others |
|
* when calling callbacks above. |
|
*/ |
|
wmb(); |
|
inet->sk_user_data = svsk; |
|
|
|
/* Initialize the socket */ |
|
if (sock->type == SOCK_DGRAM) |
|
svc_udp_init(svsk, serv); |
|
else |
|
svc_tcp_init(svsk, serv); |
|
|
|
trace_svcsock_new_socket(sock); |
|
return svsk; |
|
} |
|
|
|
bool svc_alien_sock(struct net *net, int fd) |
|
{ |
|
int err; |
|
struct socket *sock = sockfd_lookup(fd, &err); |
|
bool ret = false; |
|
|
|
if (!sock) |
|
goto out; |
|
if (sock_net(sock->sk) != net) |
|
ret = true; |
|
sockfd_put(sock); |
|
out: |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(svc_alien_sock); |
|
|
|
/** |
|
* svc_addsock - add a listener socket to an RPC service |
|
* @serv: pointer to RPC service to which to add a new listener |
|
* @fd: file descriptor of the new listener |
|
* @name_return: pointer to buffer to fill in with name of listener |
|
* @len: size of the buffer |
|
* @cred: credential |
|
* |
|
* Fills in socket name and returns positive length of name if successful. |
|
* Name is terminated with '\n'. On error, returns a negative errno |
|
* value. |
|
*/ |
|
int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, |
|
const size_t len, const struct cred *cred) |
|
{ |
|
int err = 0; |
|
struct socket *so = sockfd_lookup(fd, &err); |
|
struct svc_sock *svsk = NULL; |
|
struct sockaddr_storage addr; |
|
struct sockaddr *sin = (struct sockaddr *)&addr; |
|
int salen; |
|
|
|
if (!so) |
|
return err; |
|
err = -EAFNOSUPPORT; |
|
if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
|
goto out; |
|
err = -EPROTONOSUPPORT; |
|
if (so->sk->sk_protocol != IPPROTO_TCP && |
|
so->sk->sk_protocol != IPPROTO_UDP) |
|
goto out; |
|
err = -EISCONN; |
|
if (so->state > SS_UNCONNECTED) |
|
goto out; |
|
err = -ENOENT; |
|
if (!try_module_get(THIS_MODULE)) |
|
goto out; |
|
svsk = svc_setup_socket(serv, so, SVC_SOCK_DEFAULTS); |
|
if (IS_ERR(svsk)) { |
|
module_put(THIS_MODULE); |
|
err = PTR_ERR(svsk); |
|
goto out; |
|
} |
|
salen = kernel_getsockname(svsk->sk_sock, sin); |
|
if (salen >= 0) |
|
svc_xprt_set_local(&svsk->sk_xprt, sin, salen); |
|
svsk->sk_xprt.xpt_cred = get_cred(cred); |
|
svc_add_new_perm_xprt(serv, &svsk->sk_xprt); |
|
return svc_one_sock_name(svsk, name_return, len); |
|
out: |
|
sockfd_put(so); |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(svc_addsock); |
|
|
|
/* |
|
* Create socket for RPC service. |
|
*/ |
|
static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
|
int protocol, |
|
struct net *net, |
|
struct sockaddr *sin, int len, |
|
int flags) |
|
{ |
|
struct svc_sock *svsk; |
|
struct socket *sock; |
|
int error; |
|
int type; |
|
struct sockaddr_storage addr; |
|
struct sockaddr *newsin = (struct sockaddr *)&addr; |
|
int newlen; |
|
int family; |
|
|
|
if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { |
|
printk(KERN_WARNING "svc: only UDP and TCP " |
|
"sockets supported\n"); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
|
switch (sin->sa_family) { |
|
case AF_INET6: |
|
family = PF_INET6; |
|
break; |
|
case AF_INET: |
|
family = PF_INET; |
|
break; |
|
default: |
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
error = __sock_create(net, family, type, protocol, &sock, 1); |
|
if (error < 0) |
|
return ERR_PTR(error); |
|
|
|
svc_reclassify_socket(sock); |
|
|
|
/* |
|
* If this is an PF_INET6 listener, we want to avoid |
|
* getting requests from IPv4 remotes. Those should |
|
* be shunted to a PF_INET listener via rpcbind. |
|
*/ |
|
if (family == PF_INET6) |
|
ip6_sock_set_v6only(sock->sk); |
|
if (type == SOCK_STREAM) |
|
sock->sk->sk_reuse = SK_CAN_REUSE; /* allow address reuse */ |
|
error = kernel_bind(sock, sin, len); |
|
if (error < 0) |
|
goto bummer; |
|
|
|
error = kernel_getsockname(sock, newsin); |
|
if (error < 0) |
|
goto bummer; |
|
newlen = error; |
|
|
|
if (protocol == IPPROTO_TCP) { |
|
if ((error = kernel_listen(sock, 64)) < 0) |
|
goto bummer; |
|
} |
|
|
|
svsk = svc_setup_socket(serv, sock, flags); |
|
if (IS_ERR(svsk)) { |
|
error = PTR_ERR(svsk); |
|
goto bummer; |
|
} |
|
svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
|
return (struct svc_xprt *)svsk; |
|
bummer: |
|
sock_release(sock); |
|
return ERR_PTR(error); |
|
} |
|
|
|
/* |
|
* Detach the svc_sock from the socket so that no |
|
* more callbacks occur. |
|
*/ |
|
static void svc_sock_detach(struct svc_xprt *xprt) |
|
{ |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
struct sock *sk = svsk->sk_sk; |
|
|
|
/* put back the old socket callbacks */ |
|
lock_sock(sk); |
|
sk->sk_state_change = svsk->sk_ostate; |
|
sk->sk_data_ready = svsk->sk_odata; |
|
sk->sk_write_space = svsk->sk_owspace; |
|
sk->sk_user_data = NULL; |
|
release_sock(sk); |
|
} |
|
|
|
/* |
|
* Disconnect the socket, and reset the callbacks |
|
*/ |
|
static void svc_tcp_sock_detach(struct svc_xprt *xprt) |
|
{ |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
|
|
svc_sock_detach(xprt); |
|
|
|
if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
|
svc_tcp_clear_pages(svsk); |
|
kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
|
} |
|
} |
|
|
|
/* |
|
* Free the svc_sock's socket resources and the svc_sock itself. |
|
*/ |
|
static void svc_sock_free(struct svc_xprt *xprt) |
|
{ |
|
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
|
|
|
if (svsk->sk_sock->file) |
|
sockfd_put(svsk->sk_sock); |
|
else |
|
sock_release(svsk->sk_sock); |
|
kfree(svsk); |
|
}
|
|
|