--- /dev/null
+/*
+ * linux/net/sunrpc/svcsock.c
+ *
+ * These are the RPC server socket internals.
+ *
+ * The server scheduling algorithm does not always distribute the load
+ * evenly when servicing a single client. May need to modify the
+ * svc_xprt_enqueue procedure...
+ *
+ * TCP support is largely untested and may be a little slow. The problem
+ * is that we currently do two separate recvfrom's, one for the 4-byte
+ * record length, and the second for the actual record. This could possibly
+ * be improved by always reading a minimum size of around 100 bytes and
+ * tucking any superfluous bytes away in a temporary store. Still, that
+ * leaves write requests out in the rain. An alternative may be to peek at
+ * the first skb in the queue, and if it matches the next TCP sequence
+ * number, to extract the record marker. Yuck.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/file.h>
+#include <linux/freezer.h>
+#include <net/sock.h>
+#include <net/checksum.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/tcp.h>
+#include <net/tcp_states.h>
+#include <asm/uaccess.h>
+#include <asm/ioctls.h>
+#include <trace/events/skb.h>
+
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/xprt.h>
+
+#include "sunrpc.h"
+
+#define RPCDBG_FACILITY RPCDBG_SVCXPRT
+
+
+static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
+ int flags);
+static void svc_udp_data_ready(struct sock *);
+static int svc_udp_recvfrom(struct svc_rqst *);
+static int svc_udp_sendto(struct svc_rqst *);
+static void svc_sock_detach(struct svc_xprt *);
+static void svc_tcp_sock_detach(struct svc_xprt *);
+static void svc_sock_free(struct svc_xprt *);
+
+static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
+ struct net *, struct sockaddr *,
+ int, int);
+#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);
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key svc_key[2];
+static struct lock_class_key svc_slock_key[2];
+
+static void svc_reclassify_socket(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ WARN_ON_ONCE(sock_owned_by_user(sk));
+ if (sock_owned_by_user(sk))
+ return;
+
+ switch (sk->sk_family) {
+ case AF_INET:
+ sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD",
+ &svc_slock_key[0],
+ "sk_xprt.xpt_lock-AF_INET-NFSD",
+ &svc_key[0]);
+ break;
+
+ case AF_INET6:
+ sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD",
+ &svc_slock_key[1],
+ "sk_xprt.xpt_lock-AF_INET6-NFSD",
+ &svc_key[1]);
+ break;
+
+ default:
+ BUG();
+ }
+}
+#else
+static void svc_reclassify_socket(struct socket *sock)
+{
+}
+#endif
+
+/*
+ * Release an skbuff after use
+ */
+static void svc_release_skb(struct svc_rqst *rqstp)
+{
+ struct sk_buff *skb = rqstp->rq_xprt_ctxt;
+
+ if (skb) {
+ struct svc_sock *svsk =
+ container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+ rqstp->rq_xprt_ctxt = NULL;
+
+ dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
+ skb_free_datagram_locked(svsk->sk_sk, skb);
+ }
+}
+
+union svc_pktinfo_u {
+ struct in_pktinfo pkti;
+ struct in6_pktinfo pkti6;
+};
+#define SVC_PKTINFO_SPACE \
+ CMSG_SPACE(sizeof(union svc_pktinfo_u))
+
+static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
+{
+ struct svc_sock *svsk =
+ container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+ switch (svsk->sk_sk->sk_family) {
+ case AF_INET: {
+ struct in_pktinfo *pki = CMSG_DATA(cmh);
+
+ cmh->cmsg_level = SOL_IP;
+ cmh->cmsg_type = IP_PKTINFO;
+ pki->ipi_ifindex = 0;
+ pki->ipi_spec_dst.s_addr =
+ svc_daddr_in(rqstp)->sin_addr.s_addr;
+ cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
+ }
+ break;
+
+ case AF_INET6: {
+ struct in6_pktinfo *pki = CMSG_DATA(cmh);
+ struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp);
+
+ cmh->cmsg_level = SOL_IPV6;
+ cmh->cmsg_type = IPV6_PKTINFO;
+ pki->ipi6_ifindex = daddr->sin6_scope_id;
+ pki->ipi6_addr = daddr->sin6_addr;
+ cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
+ }
+ break;
+ }
+}
+
+/*
+ * send routine intended to be shared by the fore- and back-channel
+ */
+int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
+ struct page *headpage, unsigned long headoffset,
+ struct page *tailpage, unsigned long tailoffset)
+{
+ int result;
+ int size;
+ struct page **ppage = xdr->pages;
+ size_t base = xdr->page_base;
+ unsigned int pglen = xdr->page_len;
+ unsigned int flags = MSG_MORE;
+ int slen;
+ int len = 0;
+
+ slen = xdr->len;
+
+ /* send head */
+ if (slen == xdr->head[0].iov_len)
+ flags = 0;
+ len = kernel_sendpage(sock, headpage, headoffset,
+ xdr->head[0].iov_len, flags);
+ if (len != xdr->head[0].iov_len)
+ goto out;
+ slen -= xdr->head[0].iov_len;
+ if (slen == 0)
+ goto out;
+
+ /* send page data */
+ size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen;
+ while (pglen > 0) {
+ if (slen == size)
+ flags = 0;
+ result = kernel_sendpage(sock, *ppage, base, size, flags);
+ if (result > 0)
+ len += result;
+ if (result != size)
+ goto out;
+ slen -= size;
+ pglen -= size;
+ size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen;
+ base = 0;
+ ppage++;
+ }
+
+ /* send tail */
+ if (xdr->tail[0].iov_len) {
+ result = kernel_sendpage(sock, tailpage, tailoffset,
+ xdr->tail[0].iov_len, 0);
+ if (result > 0)
+ len += result;
+ }
+
+out:
+ return len;
+}
+
+
+/*
+ * Generic sendto routine
+ */
+static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
+{
+ struct svc_sock *svsk =
+ container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+ struct socket *sock = svsk->sk_sock;
+ union {
+ struct cmsghdr hdr;
+ long all[SVC_PKTINFO_SPACE / sizeof(long)];
+ } buffer;
+ struct cmsghdr *cmh = &buffer.hdr;
+ int len = 0;
+ unsigned long tailoff;
+ unsigned long headoff;
+ RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
+
+ if (rqstp->rq_prot == IPPROTO_UDP) {
+ struct msghdr msg = {
+ .msg_name = &rqstp->rq_addr,
+ .msg_namelen = rqstp->rq_addrlen,
+ .msg_control = cmh,
+ .msg_controllen = sizeof(buffer),
+ .msg_flags = MSG_MORE,
+ };
+
+ svc_set_cmsg_data(rqstp, cmh);
+
+ if (sock_sendmsg(sock, &msg) < 0)
+ goto out;
+ }
+
+ tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
+ headoff = 0;
+ len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
+ rqstp->rq_respages[0], tailoff);
+
+out:
+ dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
+ svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
+ xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf)));
+
+ return len;
+}
+
+/*
+ * Report socket names for nfsdfs
+ */
+static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
+{
+ const struct sock *sk = svsk->sk_sk;
+ const char *proto_name = sk->sk_protocol == IPPROTO_UDP ?
+ "udp" : "tcp";
+ int len;
+
+ switch (sk->sk_family) {
+ case PF_INET:
+ len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n",
+ proto_name,
+ &inet_sk(sk)->inet_rcv_saddr,
+ inet_sk(sk)->inet_num);
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case PF_INET6:
+ len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n",
+ proto_name,
+ &sk->sk_v6_rcv_saddr,
+ inet_sk(sk)->inet_num);
+ break;
+#endif
+ default:
+ len = snprintf(buf, remaining, "*unknown-%d*\n",
+ sk->sk_family);
+ }
+
+ if (len >= remaining) {
+ *buf = '\0';
+ return -ENAMETOOLONG;
+ }
+ return len;
+}
+
+/*
+ * Generic recvfrom routine.
+ */
+static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr,
+ int buflen)
+{
+ struct svc_sock *svsk =
+ container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
+ struct msghdr msg = {
+ .msg_flags = MSG_DONTWAIT,
+ };
+ int len;
+
+ rqstp->rq_xprt_hlen = 0;
+
+ clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+ len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen,
+ msg.msg_flags);
+ /* If we read a full record, then assume there may be more
+ * data to read (stream based sockets only!)
+ */
+ if (len == buflen)
+ set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
+
+ dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n",
+ svsk, iov[0].iov_base, iov[0].iov_len, len);
+ return len;
+}
+
+static int svc_partial_recvfrom(struct svc_rqst *rqstp,
+ struct kvec *iov, int nr,
+ int buflen, unsigned int base)
+{
+ size_t save_iovlen;
+ void *save_iovbase;
+ unsigned int i;
+ int ret;
+
+ if (base == 0)
+ return svc_recvfrom(rqstp, iov, nr, buflen);
+
+ for (i = 0; i < nr; i++) {
+ if (iov[i].iov_len > base)
+ break;
+ base -= iov[i].iov_len;
+ }
+ save_iovlen = iov[i].iov_len;
+ save_iovbase = iov[i].iov_base;
+ iov[i].iov_len -= base;
+ iov[i].iov_base += base;
+ ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen);
+ iov[i].iov_len = save_iovlen;
+ iov[i].iov_base = save_iovbase;
+ return ret;
+}
+
+/*
+ * 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
+}
+
+static int svc_sock_secure_port(struct svc_rqst *rqstp)
+{
+ return svc_port_is_privileged(svc_addr(rqstp));
+}
+
+/*
+ * INET callback when data has been received on the socket.
+ */
+static void svc_udp_data_ready(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), busy=%d\n",
+ svsk, sk,
+ 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 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 ||
+ (sk_stream_min_wspace(svsk->sk_sk) == 0 &&
+ atomic_read(&xprt->xpt_reserved) == 0))
+ return 1;
+ set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
+ return 0;
+}
+
+static void svc_tcp_write_space(struct sock *sk)
+{
+ struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data);
+ struct socket *sock = sk->sk_socket;
+
+ if (!sk_stream_is_writeable(sk) || !sock)
+ return;
+ if (!svsk || svc_tcp_has_wspace(&svsk->sk_xprt))
+ clear_bit(SOCK_NOSPACE, &sock->flags);
+ svc_write_space(sk);
+}
+
+static void svc_tcp_adjust_wspace(struct svc_xprt *xprt)
+{
+ struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
+
+ if (svc_tcp_has_wspace(xprt))
+ clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags);
+}
+
+/*
+ * 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;
+}
+
+/*
+ * 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 0;
+ }
+ len = svc_addr_len(svc_addr(rqstp));
+ 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)) {
+ net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n",
+ cmh->cmsg_level, cmh->cmsg_type);
+ goto out_free;
+ }
+ 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 */
+ goto out_free;
+ }
+ 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))
+ 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++;
+
+ return len;
+out_free:
+ trace_kfree_skb(skb, svc_udp_recvfrom);
+ skb_free_datagram_locked(svsk->sk_sk, skb);
+ return 0;
+}
+
+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,
+ .xpo_secure_port = svc_sock_secure_port,
+};
+
+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)
+{
+ 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)
+{
+ 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)
+{
+ 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_warn_ratelimited("%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) {
+ net_warn_ratelimited("%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("%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;
+
+ 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);
+ 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 (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 unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp)
+{
+ unsigned int i, len, npages;
+
+ if (svsk->sk_datalen == 0)
+ return 0;
+ len = svsk->sk_datalen;
+ 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.
+ * If we haven't gotten the record length yet, get the next four bytes.
+ */
+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;
+
+ 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;
+ }
+
+ dprintk("svc: TCP record, %d bytes\n", svc_sock_reclen(svsk));
+ if (svc_sock_reclen(svsk) + svsk->sk_datalen >
+ serv->sv_max_mesg) {
+ net_notice_ratelimited("RPC: fragment too large: %d\n",
+ svc_sock_reclen(svsk));
+ goto err_delete;
+ }
+ }
+
+ return svc_sock_reclen(svsk);
+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)
+ return -EAGAIN;
+ spin_lock_bh(&bc_xprt->transport_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_bh(&bc_xprt->transport_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_bh(&bc_xprt->transport_lock);
+ return -EAGAIN;
+}
+
+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;
+}
+
+static void svc_tcp_fragment_received(struct svc_sock *svsk)
+{
+ /* If we have more data, signal svc_xprt_enqueue() to try again */
+ dprintk("svc: TCP %s record (%d bytes)\n",
+ svc_sock_final_rec(svsk) ? "final" : "nonfinal",
+ svc_sock_reclen(svsk));
+ svsk->sk_tcplen = 0;
+ svsk->sk_reclen = 0;
+}
+
+/*
+ * 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 = svc_sock_reclen(svsk) - (svsk->sk_tcplen - sizeof(rpc_fraghdr));
+
+ vec = rqstp->rq_vec;
+
+ pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0],
+ svsk->sk_datalen + want);
+
+ rqstp->rq_respages = &rqstp->rq_pages[pnum];
+ rqstp->rq_next_page = rqstp->rq_respages + 1;
+
+ /* Now receive data */
+ len = svc_partial_recvfrom(rqstp, vec, pnum, want, base);
+ if (len >= 0) {
+ svsk->sk_tcplen += len;
+ svsk->sk_datalen += len;
+ }
+ if (len != want || !svc_sock_final_rec(svsk)) {
+ svc_tcp_save_pages(svsk, rqstp);
+ if (len < 0 && len != -EAGAIN)
+ goto err_delete;
+ if (len == want)
+ svc_tcp_fragment_received(svsk);
+ else
+ dprintk("svc: incomplete TCP record (%d of %d)\n",
+ (int)(svsk->sk_tcplen - sizeof(rpc_fraghdr)),
+ svc_sock_reclen(svsk));
+ goto err_noclose;
+ }
+
+ if (svsk->sk_datalen < 8) {
+ svsk->sk_datalen = 0;
+ goto err_delete; /* client is 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++;
+
+ return rqstp->rq_arg.len;
+
+error:
+ if (len != -EAGAIN)
+ goto err_delete;
+ dprintk("RPC: TCP recvfrom got EAGAIN\n");
+ return 0;
+err_delete:
+ 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 0; /* 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 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,
+ .xpo_secure_port = svc_sock_secure_port,
+};
+
+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,
+ .xpo_secure_port = svc_sock_secure_port,
+ .xpo_adjust_wspace = svc_tcp_adjust_wspace,
+};
+
+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);
+ 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;
+ svsk->sk_datalen = 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);
+ 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 flags)
+{
+ struct svc_sock *svsk;
+ struct sock *inet;
+ int pmap_register = !(flags & SVC_SOCK_ANONYMOUS);
+ int err = 0;
+
+ dprintk("svc: svc_setup_socket %p\n", sock);
+ 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);
+ }
+
+ 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;
+}
+
+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
+ *
+ * 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;
+ 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;
+ }
+ if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0)
+ svc_xprt_set_local(&svsk->sk_xprt, sin, salen);
+ 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;
+ 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 = SK_CAN_REUSE; /* 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;
+ }
+
+ 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:
+ 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 */
Code Review / kvmfornfv.git / blobdiff