/*- * Copyright (c) 1982, 1986, 1989, 1990, 1993 * The Regents of the University of California. All rights reserved. * * sendfile(2) and related extensions: * Copyright (c) 1998, David Greenman. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94 */ #include __FBSDID("$FreeBSD$"); #include "opt_capsicum.h" #include "opt_inet.h" #include "opt_inet6.h" #include "opt_compat.h" #include "opt_ktrace.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef KTRACE #include #endif #ifdef COMPAT_FREEBSD32 #include #endif #include #include #include #include #include #include #include #include #include #include #include /* * Flags for accept1() and kern_accept4(), in addition to SOCK_CLOEXEC * and SOCK_NONBLOCK. */ #define ACCEPT4_INHERIT 0x1 #define ACCEPT4_COMPAT 0x2 static int sendit(struct thread *td, int s, struct msghdr *mp, int flags); static int recvit(struct thread *td, int s, struct msghdr *mp, void *namelenp); static int accept1(struct thread *td, int s, struct sockaddr *uname, socklen_t *anamelen, int flags); static int do_sendfile(struct thread *td, struct sendfile_args *uap, int compat); static int getsockname1(struct thread *td, struct getsockname_args *uap, int compat); static int getpeername1(struct thread *td, struct getpeername_args *uap, int compat); counter_u64_t sfstat[sizeof(struct sfstat) / sizeof(uint64_t)]; static void sfstat_init(const void *unused) { COUNTER_ARRAY_ALLOC(sfstat, sizeof(struct sfstat) / sizeof(uint64_t), M_WAITOK); } SYSINIT(sfstat, SI_SUB_MBUF, SI_ORDER_FIRST, sfstat_init, NULL); static int sfstat_sysctl(SYSCTL_HANDLER_ARGS) { struct sfstat s; COUNTER_ARRAY_COPY(sfstat, &s, sizeof(s) / sizeof(uint64_t)); if (req->newptr) COUNTER_ARRAY_ZERO(sfstat, sizeof(s) / sizeof(uint64_t)); return (SYSCTL_OUT(req, &s, sizeof(s))); } SYSCTL_PROC(_kern_ipc, OID_AUTO, sfstat, CTLTYPE_OPAQUE | CTLFLAG_RW, NULL, 0, sfstat_sysctl, "I", "sendfile statistics"); /* * Convert a user file descriptor to a kernel file entry and check if required * capability rights are present. * A reference on the file entry is held upon returning. */ int getsock_cap(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp, u_int *fflagp) { struct file *fp; int error; error = fget_unlocked(td->td_proc->p_fd, fd, rightsp, &fp, NULL); if (error != 0) return (error); if (fp->f_type != DTYPE_SOCKET) { fdrop(fp, td); return (ENOTSOCK); } if (fflagp != NULL) *fflagp = fp->f_flag; *fpp = fp; return (0); } /* * System call interface to the socket abstraction. */ #if defined(COMPAT_43) #define COMPAT_OLDSOCK #endif int sys_socket(td, uap) struct thread *td; struct socket_args /* { int domain; int type; int protocol; } */ *uap; { struct socket *so; struct file *fp; int fd, error, type, oflag, fflag; AUDIT_ARG_SOCKET(uap->domain, uap->type, uap->protocol); type = uap->type; oflag = 0; fflag = 0; if ((type & SOCK_CLOEXEC) != 0) { type &= ~SOCK_CLOEXEC; oflag |= O_CLOEXEC; } if ((type & SOCK_NONBLOCK) != 0) { type &= ~SOCK_NONBLOCK; fflag |= FNONBLOCK; } #ifdef MAC error = mac_socket_check_create(td->td_ucred, uap->domain, type, uap->protocol); if (error != 0) return (error); #endif error = falloc(td, &fp, &fd, oflag); if (error != 0) return (error); /* An extra reference on `fp' has been held for us by falloc(). */ error = socreate(uap->domain, &so, type, uap->protocol, td->td_ucred, td); if (error != 0) { fdclose(td, fp, fd); } else { finit(fp, FREAD | FWRITE | fflag, DTYPE_SOCKET, so, &socketops); if ((fflag & FNONBLOCK) != 0) (void) fo_ioctl(fp, FIONBIO, &fflag, td->td_ucred, td); td->td_retval[0] = fd; } fdrop(fp, td); return (error); } /* ARGSUSED */ int sys_bind(td, uap) struct thread *td; struct bind_args /* { int s; caddr_t name; int namelen; } */ *uap; { struct sockaddr *sa; int error; error = getsockaddr(&sa, uap->name, uap->namelen); if (error == 0) { error = kern_bindat(td, AT_FDCWD, uap->s, sa); free(sa, M_SONAME); } return (error); } int kern_bindat(struct thread *td, int dirfd, int fd, struct sockaddr *sa) { struct socket *so; struct file *fp; cap_rights_t rights; int error; AUDIT_ARG_FD(fd); AUDIT_ARG_SOCKADDR(td, dirfd, sa); error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_BIND), &fp, NULL); if (error != 0) return (error); so = fp->f_data; #ifdef KTRACE if (KTRPOINT(td, KTR_STRUCT)) ktrsockaddr(sa); #endif #ifdef MAC error = mac_socket_check_bind(td->td_ucred, so, sa); if (error == 0) { #endif if (dirfd == AT_FDCWD) error = sobind(so, sa, td); else error = sobindat(dirfd, so, sa, td); #ifdef MAC } #endif fdrop(fp, td); return (error); } /* ARGSUSED */ int sys_bindat(td, uap) struct thread *td; struct bindat_args /* { int fd; int s; caddr_t name; int namelen; } */ *uap; { struct sockaddr *sa; int error; error = getsockaddr(&sa, uap->name, uap->namelen); if (error == 0) { error = kern_bindat(td, uap->fd, uap->s, sa); free(sa, M_SONAME); } return (error); } /* ARGSUSED */ int sys_listen(td, uap) struct thread *td; struct listen_args /* { int s; int backlog; } */ *uap; { struct socket *so; struct file *fp; cap_rights_t rights; int error; AUDIT_ARG_FD(uap->s); error = getsock_cap(td, uap->s, cap_rights_init(&rights, CAP_LISTEN), &fp, NULL); if (error == 0) { so = fp->f_data; #ifdef MAC error = mac_socket_check_listen(td->td_ucred, so); if (error == 0) #endif error = solisten(so, uap->backlog, td); fdrop(fp, td); } return(error); } /* * accept1() */ static int accept1(td, s, uname, anamelen, flags) struct thread *td; int s; struct sockaddr *uname; socklen_t *anamelen; int flags; { struct sockaddr *name; socklen_t namelen; struct file *fp; int error; if (uname == NULL) return (kern_accept4(td, s, NULL, NULL, flags, NULL)); error = copyin(anamelen, &namelen, sizeof (namelen)); if (error != 0) return (error); error = kern_accept4(td, s, &name, &namelen, flags, &fp); if (error != 0) return (error); if (error == 0 && uname != NULL) { #ifdef COMPAT_OLDSOCK if (flags & ACCEPT4_COMPAT) ((struct osockaddr *)name)->sa_family = name->sa_family; #endif error = copyout(name, uname, namelen); } if (error == 0) error = copyout(&namelen, anamelen, sizeof(namelen)); if (error != 0) fdclose(td, fp, td->td_retval[0]); fdrop(fp, td); free(name, M_SONAME); return (error); } int kern_accept(struct thread *td, int s, struct sockaddr **name, socklen_t *namelen, struct file **fp) { return (kern_accept4(td, s, name, namelen, ACCEPT4_INHERIT, fp)); } int kern_accept4(struct thread *td, int s, struct sockaddr **name, socklen_t *namelen, int flags, struct file **fp) { struct file *headfp, *nfp = NULL; struct sockaddr *sa = NULL; struct socket *head, *so; cap_rights_t rights; u_int fflag; pid_t pgid; int error, fd, tmp; if (name != NULL) *name = NULL; AUDIT_ARG_FD(s); error = getsock_cap(td, s, cap_rights_init(&rights, CAP_ACCEPT), &headfp, &fflag); if (error != 0) return (error); head = headfp->f_data; if ((head->so_options & SO_ACCEPTCONN) == 0) { error = EINVAL; goto done; } #ifdef MAC error = mac_socket_check_accept(td->td_ucred, head); if (error != 0) goto done; #endif error = falloc(td, &nfp, &fd, (flags & SOCK_CLOEXEC) ? O_CLOEXEC : 0); if (error != 0) goto done; ACCEPT_LOCK(); if ((head->so_state & SS_NBIO) && TAILQ_EMPTY(&head->so_comp)) { ACCEPT_UNLOCK(); error = EWOULDBLOCK; goto noconnection; } while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0) { if (head->so_rcv.sb_state & SBS_CANTRCVMORE) { head->so_error = ECONNABORTED; break; } error = msleep(&head->so_timeo, &accept_mtx, PSOCK | PCATCH, "accept", 0); if (error != 0) { ACCEPT_UNLOCK(); goto noconnection; } } if (head->so_error) { error = head->so_error; head->so_error = 0; ACCEPT_UNLOCK(); goto noconnection; } so = TAILQ_FIRST(&head->so_comp); KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP")); KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP")); /* * Before changing the flags on the socket, we have to bump the * reference count. Otherwise, if the protocol calls sofree(), * the socket will be released due to a zero refcount. */ SOCK_LOCK(so); /* soref() and so_state update */ soref(so); /* file descriptor reference */ TAILQ_REMOVE(&head->so_comp, so, so_list); head->so_qlen--; if (flags & ACCEPT4_INHERIT) so->so_state |= (head->so_state & SS_NBIO); else so->so_state |= (flags & SOCK_NONBLOCK) ? SS_NBIO : 0; so->so_qstate &= ~SQ_COMP; so->so_head = NULL; SOCK_UNLOCK(so); ACCEPT_UNLOCK(); /* An extra reference on `nfp' has been held for us by falloc(). */ td->td_retval[0] = fd; /* connection has been removed from the listen queue */ KNOTE_UNLOCKED(&head->so_rcv.sb_sel.si_note, 0); if (flags & ACCEPT4_INHERIT) { pgid = fgetown(&head->so_sigio); if (pgid != 0) fsetown(pgid, &so->so_sigio); } else { fflag &= ~(FNONBLOCK | FASYNC); if (flags & SOCK_NONBLOCK) fflag |= FNONBLOCK; } finit(nfp, fflag, DTYPE_SOCKET, so, &socketops); /* Sync socket nonblocking/async state with file flags */ tmp = fflag & FNONBLOCK; (void) fo_ioctl(nfp, FIONBIO, &tmp, td->td_ucred, td); tmp = fflag & FASYNC; (void) fo_ioctl(nfp, FIOASYNC, &tmp, td->td_ucred, td); sa = 0; error = soaccept(so, &sa); if (error != 0) goto noconnection; if (sa == NULL) { if (name) *namelen = 0; goto done; } AUDIT_ARG_SOCKADDR(td, AT_FDCWD, sa); if (name) { /* check sa_len before it is destroyed */ if (*namelen > sa->sa_len) *namelen = sa->sa_len; #ifdef KTRACE if (KTRPOINT(td, KTR_STRUCT)) ktrsockaddr(sa); #endif *name = sa; sa = NULL; } noconnection: free(sa, M_SONAME); /* * close the new descriptor, assuming someone hasn't ripped it * out from under us. */ if (error != 0) fdclose(td, nfp, fd); /* * Release explicitly held references before returning. We return * a reference on nfp to the caller on success if they request it. */ done: if (fp != NULL) { if (error == 0) { *fp = nfp; nfp = NULL; } else *fp = NULL; } if (nfp != NULL) fdrop(nfp, td); fdrop(headfp, td); return (error); } int sys_accept(td, uap) struct thread *td; struct accept_args *uap; { return (accept1(td, uap->s, uap->name, uap->anamelen, ACCEPT4_INHERIT)); } int sys_accept4(td, uap) struct thread *td; struct accept4_args *uap; { if (uap->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) return (EINVAL); return (accept1(td, uap->s, uap->name, uap->anamelen, uap->flags)); } #ifdef COMPAT_OLDSOCK int oaccept(td, uap) struct thread *td; struct accept_args *uap; { return (accept1(td, uap->s, uap->name, uap->anamelen, ACCEPT4_INHERIT | ACCEPT4_COMPAT)); } #endif /* COMPAT_OLDSOCK */ /* ARGSUSED */ int sys_connect(td, uap) struct thread *td; struct connect_args /* { int s; caddr_t name; int namelen; } */ *uap; { struct sockaddr *sa; int error; error = getsockaddr(&sa, uap->name, uap->namelen); if (error == 0) { error = kern_connectat(td, AT_FDCWD, uap->s, sa); free(sa, M_SONAME); } return (error); } int kern_connectat(struct thread *td, int dirfd, int fd, struct sockaddr *sa) { struct socket *so; struct file *fp; cap_rights_t rights; int error, interrupted = 0; AUDIT_ARG_FD(fd); AUDIT_ARG_SOCKADDR(td, dirfd, sa); error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_CONNECT), &fp, NULL); if (error != 0) return (error); so = fp->f_data; if (so->so_state & SS_ISCONNECTING) { error = EALREADY; goto done1; } #ifdef KTRACE if (KTRPOINT(td, KTR_STRUCT)) ktrsockaddr(sa); #endif #ifdef MAC error = mac_socket_check_connect(td->td_ucred, so, sa); if (error != 0) goto bad; #endif if (dirfd == AT_FDCWD) error = soconnect(so, sa, td); else error = soconnectat(dirfd, so, sa, td); if (error != 0) goto bad; if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) { error = EINPROGRESS; goto done1; } SOCK_LOCK(so); while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH, "connec", 0); if (error != 0) { if (error == EINTR || error == ERESTART) interrupted = 1; break; } } if (error == 0) { error = so->so_error; so->so_error = 0; } SOCK_UNLOCK(so); bad: if (!interrupted) so->so_state &= ~SS_ISCONNECTING; if (error == ERESTART) error = EINTR; done1: fdrop(fp, td); return (error); } /* ARGSUSED */ int sys_connectat(td, uap) struct thread *td; struct connectat_args /* { int fd; int s; caddr_t name; int namelen; } */ *uap; { struct sockaddr *sa; int error; error = getsockaddr(&sa, uap->name, uap->namelen); if (error == 0) { error = kern_connectat(td, uap->fd, uap->s, sa); free(sa, M_SONAME); } return (error); } int kern_socketpair(struct thread *td, int domain, int type, int protocol, int *rsv) { struct file *fp1, *fp2; struct socket *so1, *so2; int fd, error, oflag, fflag; AUDIT_ARG_SOCKET(domain, type, protocol); oflag = 0; fflag = 0; if ((type & SOCK_CLOEXEC) != 0) { type &= ~SOCK_CLOEXEC; oflag |= O_CLOEXEC; } if ((type & SOCK_NONBLOCK) != 0) { type &= ~SOCK_NONBLOCK; fflag |= FNONBLOCK; } #ifdef MAC /* We might want to have a separate check for socket pairs. */ error = mac_socket_check_create(td->td_ucred, domain, type, protocol); if (error != 0) return (error); #endif error = socreate(domain, &so1, type, protocol, td->td_ucred, td); if (error != 0) return (error); error = socreate(domain, &so2, type, protocol, td->td_ucred, td); if (error != 0) goto free1; /* On success extra reference to `fp1' and 'fp2' is set by falloc. */ error = falloc(td, &fp1, &fd, oflag); if (error != 0) goto free2; rsv[0] = fd; fp1->f_data = so1; /* so1 already has ref count */ error = falloc(td, &fp2, &fd, oflag); if (error != 0) goto free3; fp2->f_data = so2; /* so2 already has ref count */ rsv[1] = fd; error = soconnect2(so1, so2); if (error != 0) goto free4; if (type == SOCK_DGRAM) { /* * Datagram socket connection is asymmetric. */ error = soconnect2(so2, so1); if (error != 0) goto free4; } finit(fp1, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp1->f_data, &socketops); finit(fp2, FREAD | FWRITE | fflag, DTYPE_SOCKET, fp2->f_data, &socketops); if ((fflag & FNONBLOCK) != 0) { (void) fo_ioctl(fp1, FIONBIO, &fflag, td->td_ucred, td); (void) fo_ioctl(fp2, FIONBIO, &fflag, td->td_ucred, td); } fdrop(fp1, td); fdrop(fp2, td); return (0); free4: fdclose(td, fp2, rsv[1]); fdrop(fp2, td); free3: fdclose(td, fp1, rsv[0]); fdrop(fp1, td); free2: if (so2 != NULL) (void)soclose(so2); free1: if (so1 != NULL) (void)soclose(so1); return (error); } int sys_socketpair(struct thread *td, struct socketpair_args *uap) { int error, sv[2]; error = kern_socketpair(td, uap->domain, uap->type, uap->protocol, sv); if (error != 0) return (error); error = copyout(sv, uap->rsv, 2 * sizeof(int)); if (error != 0) { (void)kern_close(td, sv[0]); (void)kern_close(td, sv[1]); } return (error); } static int sendit(td, s, mp, flags) struct thread *td; int s; struct msghdr *mp; int flags; { struct mbuf *control; struct sockaddr *to; int error; #ifdef CAPABILITY_MODE if (IN_CAPABILITY_MODE(td) && (mp->msg_name != NULL)) return (ECAPMODE); #endif if (mp->msg_name != NULL) { error = getsockaddr(&to, mp->msg_name, mp->msg_namelen); if (error != 0) { to = NULL; goto bad; } mp->msg_name = to; } else { to = NULL; } if (mp->msg_control) { if (mp->msg_controllen < sizeof(struct cmsghdr) #ifdef COMPAT_OLDSOCK && mp->msg_flags != MSG_COMPAT #endif ) { error = EINVAL; goto bad; } error = sockargs(&control, mp->msg_control, mp->msg_controllen, MT_CONTROL); if (error != 0) goto bad; #ifdef COMPAT_OLDSOCK if (mp->msg_flags == MSG_COMPAT) { struct cmsghdr *cm; M_PREPEND(control, sizeof(*cm), M_WAITOK); cm = mtod(control, struct cmsghdr *); cm->cmsg_len = control->m_len; cm->cmsg_level = SOL_SOCKET; cm->cmsg_type = SCM_RIGHTS; } #endif } else { control = NULL; } error = kern_sendit(td, s, mp, flags, control, UIO_USERSPACE); bad: free(to, M_SONAME); return (error); } int kern_sendit(td, s, mp, flags, control, segflg) struct thread *td; int s; struct msghdr *mp; int flags; struct mbuf *control; enum uio_seg segflg; { struct file *fp; struct uio auio; struct iovec *iov; struct socket *so; cap_rights_t rights; #ifdef KTRACE struct uio *ktruio = NULL; #endif ssize_t len; int i, error; AUDIT_ARG_FD(s); cap_rights_init(&rights, CAP_SEND); if (mp->msg_name != NULL) { AUDIT_ARG_SOCKADDR(td, AT_FDCWD, mp->msg_name); cap_rights_set(&rights, CAP_CONNECT); } error = getsock_cap(td, s, &rights, &fp, NULL); if (error != 0) return (error); so = (struct socket *)fp->f_data; #ifdef KTRACE if (mp->msg_name != NULL && KTRPOINT(td, KTR_STRUCT)) ktrsockaddr(mp->msg_name); #endif #ifdef MAC if (mp->msg_name != NULL) { error = mac_socket_check_connect(td->td_ucred, so, mp->msg_name); if (error != 0) goto bad; } error = mac_socket_check_send(td->td_ucred, so); if (error != 0) goto bad; #endif auio.uio_iov = mp->msg_iov; auio.uio_iovcnt = mp->msg_iovlen; auio.uio_segflg = segflg; auio.uio_rw = UIO_WRITE; auio.uio_td = td; auio.uio_offset = 0; /* XXX */ auio.uio_resid = 0; iov = mp->msg_iov; for (i = 0; i < mp->msg_iovlen; i++, iov++) { if ((auio.uio_resid += iov->iov_len) < 0) { error = EINVAL; goto bad; } } #ifdef KTRACE if (KTRPOINT(td, KTR_GENIO)) ktruio = cloneuio(&auio); #endif len = auio.uio_resid; error = sosend(so, mp->msg_name, &auio, 0, control, flags, td); if (error != 0) { if (auio.uio_resid != len && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) error = 0; /* Generation of SIGPIPE can be controlled per socket */ if (error == EPIPE && !(so->so_options & SO_NOSIGPIPE) && !(flags & MSG_NOSIGNAL)) { PROC_LOCK(td->td_proc); tdsignal(td, SIGPIPE); PROC_UNLOCK(td->td_proc); } } if (error == 0) td->td_retval[0] = len - auio.uio_resid; #ifdef KTRACE if (ktruio != NULL) { ktruio->uio_resid = td->td_retval[0]; ktrgenio(s, UIO_WRITE, ktruio, error); } #endif bad: fdrop(fp, td); return (error); } int sys_sendto(td, uap) struct thread *td; struct sendto_args /* { int s; caddr_t buf; size_t len; int flags; caddr_t to; int tolen; } */ *uap; { struct msghdr msg; struct iovec aiov; msg.msg_name = uap->to; msg.msg_namelen = uap->tolen; msg.msg_iov = &aiov; msg.msg_iovlen = 1; msg.msg_control = 0; #ifdef COMPAT_OLDSOCK msg.msg_flags = 0; #endif aiov.iov_base = uap->buf; aiov.iov_len = uap->len; return (sendit(td, uap->s, &msg, uap->flags)); } #ifdef COMPAT_OLDSOCK int osend(td, uap) struct thread *td; struct osend_args /* { int s; caddr_t buf; int len; int flags; } */ *uap; { struct msghdr msg; struct iovec aiov; msg.msg_name = 0; msg.msg_namelen = 0; msg.msg_iov = &aiov; msg.msg_iovlen = 1; aiov.iov_base = uap->buf; aiov.iov_len = uap->len; msg.msg_control = 0; msg.msg_flags = 0; return (sendit(td, uap->s, &msg, uap->flags)); } int osendmsg(td, uap) struct thread *td; struct osendmsg_args /* { int s; caddr_t msg; int flags; } */ *uap; { struct msghdr msg; struct iovec *iov; int error; error = copyin(uap->msg, &msg, sizeof (struct omsghdr)); if (error != 0) return (error); error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); if (error != 0) return (error); msg.msg_iov = iov; msg.msg_flags = MSG_COMPAT; error = sendit(td, uap->s, &msg, uap->flags); free(iov, M_IOV); return (error); } #endif int sys_sendmsg(td, uap) struct thread *td; struct sendmsg_args /* { int s; caddr_t msg; int flags; } */ *uap; { struct msghdr msg; struct iovec *iov; int error; error = copyin(uap->msg, &msg, sizeof (msg)); if (error != 0) return (error); error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); if (error != 0) return (error); msg.msg_iov = iov; #ifdef COMPAT_OLDSOCK msg.msg_flags = 0; #endif error = sendit(td, uap->s, &msg, uap->flags); free(iov, M_IOV); return (error); } int kern_recvit(td, s, mp, fromseg, controlp) struct thread *td; int s; struct msghdr *mp; enum uio_seg fromseg; struct mbuf **controlp; { struct uio auio; struct iovec *iov; struct mbuf *m, *control = NULL; caddr_t ctlbuf; struct file *fp; struct socket *so; struct sockaddr *fromsa = NULL; cap_rights_t rights; #ifdef KTRACE struct uio *ktruio = NULL; #endif ssize_t len; int error, i; if (controlp != NULL) *controlp = NULL; AUDIT_ARG_FD(s); error = getsock_cap(td, s, cap_rights_init(&rights, CAP_RECV), &fp, NULL); if (error != 0) return (error); so = fp->f_data; #ifdef MAC error = mac_socket_check_receive(td->td_ucred, so); if (error != 0) { fdrop(fp, td); return (error); } #endif auio.uio_iov = mp->msg_iov; auio.uio_iovcnt = mp->msg_iovlen; auio.uio_segflg = UIO_USERSPACE; auio.uio_rw = UIO_READ; auio.uio_td = td; auio.uio_offset = 0; /* XXX */ auio.uio_resid = 0; iov = mp->msg_iov; for (i = 0; i < mp->msg_iovlen; i++, iov++) { if ((auio.uio_resid += iov->iov_len) < 0) { fdrop(fp, td); return (EINVAL); } } #ifdef KTRACE if (KTRPOINT(td, KTR_GENIO)) ktruio = cloneuio(&auio); #endif len = auio.uio_resid; error = soreceive(so, &fromsa, &auio, NULL, (mp->msg_control || controlp) ? &control : NULL, &mp->msg_flags); if (error != 0) { if (auio.uio_resid != len && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) error = 0; } if (fromsa != NULL) AUDIT_ARG_SOCKADDR(td, AT_FDCWD, fromsa); #ifdef KTRACE if (ktruio != NULL) { ktruio->uio_resid = len - auio.uio_resid; ktrgenio(s, UIO_READ, ktruio, error); } #endif if (error != 0) goto out; td->td_retval[0] = len - auio.uio_resid; if (mp->msg_name) { len = mp->msg_namelen; if (len <= 0 || fromsa == NULL) len = 0; else { /* save sa_len before it is destroyed by MSG_COMPAT */ len = MIN(len, fromsa->sa_len); #ifdef COMPAT_OLDSOCK if (mp->msg_flags & MSG_COMPAT) ((struct osockaddr *)fromsa)->sa_family = fromsa->sa_family; #endif if (fromseg == UIO_USERSPACE) { error = copyout(fromsa, mp->msg_name, (unsigned)len); if (error != 0) goto out; } else bcopy(fromsa, mp->msg_name, len); } mp->msg_namelen = len; } if (mp->msg_control && controlp == NULL) { #ifdef COMPAT_OLDSOCK /* * We assume that old recvmsg calls won't receive access * rights and other control info, esp. as control info * is always optional and those options didn't exist in 4.3. * If we receive rights, trim the cmsghdr; anything else * is tossed. */ if (control && mp->msg_flags & MSG_COMPAT) { if (mtod(control, struct cmsghdr *)->cmsg_level != SOL_SOCKET || mtod(control, struct cmsghdr *)->cmsg_type != SCM_RIGHTS) { mp->msg_controllen = 0; goto out; } control->m_len -= sizeof (struct cmsghdr); control->m_data += sizeof (struct cmsghdr); } #endif len = mp->msg_controllen; m = control; mp->msg_controllen = 0; ctlbuf = mp->msg_control; while (m && len > 0) { unsigned int tocopy; if (len >= m->m_len) tocopy = m->m_len; else { mp->msg_flags |= MSG_CTRUNC; tocopy = len; } if ((error = copyout(mtod(m, caddr_t), ctlbuf, tocopy)) != 0) goto out; ctlbuf += tocopy; len -= tocopy; m = m->m_next; } mp->msg_controllen = ctlbuf - (caddr_t)mp->msg_control; } out: fdrop(fp, td); #ifdef KTRACE if (fromsa && KTRPOINT(td, KTR_STRUCT)) ktrsockaddr(fromsa); #endif free(fromsa, M_SONAME); if (error == 0 && controlp != NULL) *controlp = control; else if (control) m_freem(control); return (error); } static int recvit(td, s, mp, namelenp) struct thread *td; int s; struct msghdr *mp; void *namelenp; { int error; error = kern_recvit(td, s, mp, UIO_USERSPACE, NULL); if (error != 0) return (error); if (namelenp != NULL) { error = copyout(&mp->msg_namelen, namelenp, sizeof (socklen_t)); #ifdef COMPAT_OLDSOCK if (mp->msg_flags & MSG_COMPAT) error = 0; /* old recvfrom didn't check */ #endif } return (error); } int sys_recvfrom(td, uap) struct thread *td; struct recvfrom_args /* { int s; caddr_t buf; size_t len; int flags; struct sockaddr * __restrict from; socklen_t * __restrict fromlenaddr; } */ *uap; { struct msghdr msg; struct iovec aiov; int error; if (uap->fromlenaddr) { error = copyin(uap->fromlenaddr, &msg.msg_namelen, sizeof (msg.msg_namelen)); if (error != 0) goto done2; } else { msg.msg_namelen = 0; } msg.msg_name = uap->from; msg.msg_iov = &aiov; msg.msg_iovlen = 1; aiov.iov_base = uap->buf; aiov.iov_len = uap->len; msg.msg_control = 0; msg.msg_flags = uap->flags; error = recvit(td, uap->s, &msg, uap->fromlenaddr); done2: return (error); } #ifdef COMPAT_OLDSOCK int orecvfrom(td, uap) struct thread *td; struct recvfrom_args *uap; { uap->flags |= MSG_COMPAT; return (sys_recvfrom(td, uap)); } #endif #ifdef COMPAT_OLDSOCK int orecv(td, uap) struct thread *td; struct orecv_args /* { int s; caddr_t buf; int len; int flags; } */ *uap; { struct msghdr msg; struct iovec aiov; msg.msg_name = 0; msg.msg_namelen = 0; msg.msg_iov = &aiov; msg.msg_iovlen = 1; aiov.iov_base = uap->buf; aiov.iov_len = uap->len; msg.msg_control = 0; msg.msg_flags = uap->flags; return (recvit(td, uap->s, &msg, NULL)); } /* * Old recvmsg. This code takes advantage of the fact that the old msghdr * overlays the new one, missing only the flags, and with the (old) access * rights where the control fields are now. */ int orecvmsg(td, uap) struct thread *td; struct orecvmsg_args /* { int s; struct omsghdr *msg; int flags; } */ *uap; { struct msghdr msg; struct iovec *iov; int error; error = copyin(uap->msg, &msg, sizeof (struct omsghdr)); if (error != 0) return (error); error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); if (error != 0) return (error); msg.msg_flags = uap->flags | MSG_COMPAT; msg.msg_iov = iov; error = recvit(td, uap->s, &msg, &uap->msg->msg_namelen); if (msg.msg_controllen && error == 0) error = copyout(&msg.msg_controllen, &uap->msg->msg_accrightslen, sizeof (int)); free(iov, M_IOV); return (error); } #endif int sys_recvmsg(td, uap) struct thread *td; struct recvmsg_args /* { int s; struct msghdr *msg; int flags; } */ *uap; { struct msghdr msg; struct iovec *uiov, *iov; int error; error = copyin(uap->msg, &msg, sizeof (msg)); if (error != 0) return (error); error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); if (error != 0) return (error); msg.msg_flags = uap->flags; #ifdef COMPAT_OLDSOCK msg.msg_flags &= ~MSG_COMPAT; #endif uiov = msg.msg_iov; msg.msg_iov = iov; error = recvit(td, uap->s, &msg, NULL); if (error == 0) { msg.msg_iov = uiov; error = copyout(&msg, uap->msg, sizeof(msg)); } free(iov, M_IOV); return (error); } /* ARGSUSED */ int sys_shutdown(td, uap) struct thread *td; struct shutdown_args /* { int s; int how; } */ *uap; { struct socket *so; struct file *fp; cap_rights_t rights; int error; AUDIT_ARG_FD(uap->s); error = getsock_cap(td, uap->s, cap_rights_init(&rights, CAP_SHUTDOWN), &fp, NULL); if (error == 0) { so = fp->f_data; error = soshutdown(so, uap->how); /* * Previous versions did not return ENOTCONN, but 0 in * case the socket was not connected. Some important * programs like syslogd up to r279016, 2015-02-19, * still depend on this behavior. */ if (error == ENOTCONN && td->td_proc->p_osrel < P_OSREL_SHUTDOWN_ENOTCONN) error = 0; fdrop(fp, td); } return (error); } /* ARGSUSED */ int sys_setsockopt(td, uap) struct thread *td; struct setsockopt_args /* { int s; int level; int name; caddr_t val; int valsize; } */ *uap; { return (kern_setsockopt(td, uap->s, uap->level, uap->name, uap->val, UIO_USERSPACE, uap->valsize)); } int kern_setsockopt(td, s, level, name, val, valseg, valsize) struct thread *td; int s; int level; int name; void *val; enum uio_seg valseg; socklen_t valsize; { struct socket *so; struct file *fp; struct sockopt sopt; cap_rights_t rights; int error; if (val == NULL && valsize != 0) return (EFAULT); if ((int)valsize < 0) return (EINVAL); sopt.sopt_dir = SOPT_SET; sopt.sopt_level = level; sopt.sopt_name = name; sopt.sopt_val = val; sopt.sopt_valsize = valsize; switch (valseg) { case UIO_USERSPACE: sopt.sopt_td = td; break; case UIO_SYSSPACE: sopt.sopt_td = NULL; break; default: panic("kern_setsockopt called with bad valseg"); } AUDIT_ARG_FD(s); error = getsock_cap(td, s, cap_rights_init(&rights, CAP_SETSOCKOPT), &fp, NULL); if (error == 0) { so = fp->f_data; error = sosetopt(so, &sopt); fdrop(fp, td); } return(error); } /* ARGSUSED */ int sys_getsockopt(td, uap) struct thread *td; struct getsockopt_args /* { int s; int level; int name; void * __restrict val; socklen_t * __restrict avalsize; } */ *uap; { socklen_t valsize; int error; if (uap->val) { error = copyin(uap->avalsize, &valsize, sizeof (valsize)); if (error != 0) return (error); } error = kern_getsockopt(td, uap->s, uap->level, uap->name, uap->val, UIO_USERSPACE, &valsize); if (error == 0) error = copyout(&valsize, uap->avalsize, sizeof (valsize)); return (error); } /* * Kernel version of getsockopt. * optval can be a userland or userspace. optlen is always a kernel pointer. */ int kern_getsockopt(td, s, level, name, val, valseg, valsize) struct thread *td; int s; int level; int name; void *val; enum uio_seg valseg; socklen_t *valsize; { struct socket *so; struct file *fp; struct sockopt sopt; cap_rights_t rights; int error; if (val == NULL) *valsize = 0; if ((int)*valsize < 0) return (EINVAL); sopt.sopt_dir = SOPT_GET; sopt.sopt_level = level; sopt.sopt_name = name; sopt.sopt_val = val; sopt.sopt_valsize = (size_t)*valsize; /* checked non-negative above */ switch (valseg) { case UIO_USERSPACE: sopt.sopt_td = td; break; case UIO_SYSSPACE: sopt.sopt_td = NULL; break; default: panic("kern_getsockopt called with bad valseg"); } AUDIT_ARG_FD(s); error = getsock_cap(td, s, cap_rights_init(&rights, CAP_GETSOCKOPT), &fp, NULL); if (error == 0) { so = fp->f_data; error = sogetopt(so, &sopt); *valsize = sopt.sopt_valsize; fdrop(fp, td); } return (error); } /* * getsockname1() - Get socket name. */ /* ARGSUSED */ static int getsockname1(td, uap, compat) struct thread *td; struct getsockname_args /* { int fdes; struct sockaddr * __restrict asa; socklen_t * __restrict alen; } */ *uap; int compat; { struct sockaddr *sa; socklen_t len; int error; error = copyin(uap->alen, &len, sizeof(len)); if (error != 0) return (error); error = kern_getsockname(td, uap->fdes, &sa, &len); if (error != 0) return (error); if (len != 0) { #ifdef COMPAT_OLDSOCK if (compat) ((struct osockaddr *)sa)->sa_family = sa->sa_family; #endif error = copyout(sa, uap->asa, (u_int)len); } free(sa, M_SONAME); if (error == 0) error = copyout(&len, uap->alen, sizeof(len)); return (error); } int kern_getsockname(struct thread *td, int fd, struct sockaddr **sa, socklen_t *alen) { struct socket *so; struct file *fp; cap_rights_t rights; socklen_t len; int error; AUDIT_ARG_FD(fd); error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_GETSOCKNAME), &fp, NULL); if (error != 0) return (error); so = fp->f_data; *sa = NULL; CURVNET_SET(so->so_vnet); error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, sa); CURVNET_RESTORE(); if (error != 0) goto bad; if (*sa == NULL) len = 0; else len = MIN(*alen, (*sa)->sa_len); *alen = len; #ifdef KTRACE if (KTRPOINT(td, KTR_STRUCT)) ktrsockaddr(*sa); #endif bad: fdrop(fp, td); if (error != 0 && *sa != NULL) { free(*sa, M_SONAME); *sa = NULL; } return (error); } int sys_getsockname(td, uap) struct thread *td; struct getsockname_args *uap; { return (getsockname1(td, uap, 0)); } #ifdef COMPAT_OLDSOCK int ogetsockname(td, uap) struct thread *td; struct getsockname_args *uap; { return (getsockname1(td, uap, 1)); } #endif /* COMPAT_OLDSOCK */ /* * getpeername1() - Get name of peer for connected socket. */ /* ARGSUSED */ static int getpeername1(td, uap, compat) struct thread *td; struct getpeername_args /* { int fdes; struct sockaddr * __restrict asa; socklen_t * __restrict alen; } */ *uap; int compat; { struct sockaddr *sa; socklen_t len; int error; error = copyin(uap->alen, &len, sizeof (len)); if (error != 0) return (error); error = kern_getpeername(td, uap->fdes, &sa, &len); if (error != 0) return (error); if (len != 0) { #ifdef COMPAT_OLDSOCK if (compat) ((struct osockaddr *)sa)->sa_family = sa->sa_family; #endif error = copyout(sa, uap->asa, (u_int)len); } free(sa, M_SONAME); if (error == 0) error = copyout(&len, uap->alen, sizeof(len)); return (error); } int kern_getpeername(struct thread *td, int fd, struct sockaddr **sa, socklen_t *alen) { struct socket *so; struct file *fp; cap_rights_t rights; socklen_t len; int error; AUDIT_ARG_FD(fd); error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_GETPEERNAME), &fp, NULL); if (error != 0) return (error); so = fp->f_data; if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { error = ENOTCONN; goto done; } *sa = NULL; CURVNET_SET(so->so_vnet); error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, sa); CURVNET_RESTORE(); if (error != 0) goto bad; if (*sa == NULL) len = 0; else len = MIN(*alen, (*sa)->sa_len); *alen = len; #ifdef KTRACE if (KTRPOINT(td, KTR_STRUCT)) ktrsockaddr(*sa); #endif bad: if (error != 0 && *sa != NULL) { free(*sa, M_SONAME); *sa = NULL; } done: fdrop(fp, td); return (error); } int sys_getpeername(td, uap) struct thread *td; struct getpeername_args *uap; { return (getpeername1(td, uap, 0)); } #ifdef COMPAT_OLDSOCK int ogetpeername(td, uap) struct thread *td; struct ogetpeername_args *uap; { /* XXX uap should have type `getpeername_args *' to begin with. */ return (getpeername1(td, (struct getpeername_args *)uap, 1)); } #endif /* COMPAT_OLDSOCK */ int sockargs(mp, buf, buflen, type) struct mbuf **mp; caddr_t buf; int buflen, type; { struct sockaddr *sa; struct mbuf *m; int error; if (buflen > MLEN) { #ifdef COMPAT_OLDSOCK if (type == MT_SONAME && buflen <= 112) buflen = MLEN; /* unix domain compat. hack */ else #endif if (buflen > MCLBYTES) return (EINVAL); } m = m_get2(buflen, M_WAITOK, type, 0); m->m_len = buflen; error = copyin(buf, mtod(m, caddr_t), (u_int)buflen); if (error != 0) (void) m_free(m); else { *mp = m; if (type == MT_SONAME) { sa = mtod(m, struct sockaddr *); #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN if (sa->sa_family == 0 && sa->sa_len < AF_MAX) sa->sa_family = sa->sa_len; #endif sa->sa_len = buflen; } } return (error); } int getsockaddr(namp, uaddr, len) struct sockaddr **namp; caddr_t uaddr; size_t len; { struct sockaddr *sa; int error; if (len > SOCK_MAXADDRLEN) return (ENAMETOOLONG); if (len < offsetof(struct sockaddr, sa_data[0])) return (EINVAL); sa = malloc(len, M_SONAME, M_WAITOK); error = copyin(uaddr, sa, len); if (error != 0) { free(sa, M_SONAME); } else { #if defined(COMPAT_OLDSOCK) && BYTE_ORDER != BIG_ENDIAN if (sa->sa_family == 0 && sa->sa_len < AF_MAX) sa->sa_family = sa->sa_len; #endif sa->sa_len = len; *namp = sa; } return (error); } struct sendfile_sync { struct mtx mtx; struct cv cv; unsigned count; }; /* * Add more references to a vm_page + sf_buf + sendfile_sync. */ void sf_ext_ref(void *arg1, void *arg2) { struct sf_buf *sf = arg1; struct sendfile_sync *sfs = arg2; vm_page_t pg = sf_buf_page(sf); sf_buf_ref(sf); vm_page_lock(pg); vm_page_wire(pg); vm_page_unlock(pg); if (sfs != NULL) { mtx_lock(&sfs->mtx); KASSERT(sfs->count > 0, ("Sendfile sync botchup count == 0")); sfs->count++; mtx_unlock(&sfs->mtx); } } /* * Detach mapped page and release resources back to the system. */ void sf_ext_free(void *arg1, void *arg2) { struct sf_buf *sf = arg1; struct sendfile_sync *sfs = arg2; vm_page_t pg = sf_buf_page(sf); sf_buf_free(sf); vm_page_lock(pg); /* * Check for the object going away on us. This can * happen since we don't hold a reference to it. * If so, we're responsible for freeing the page. */ if (vm_page_unwire(pg, PQ_INACTIVE) && pg->object == NULL) vm_page_free(pg); vm_page_unlock(pg); if (sfs != NULL) { mtx_lock(&sfs->mtx); KASSERT(sfs->count > 0, ("Sendfile sync botchup count == 0")); if (--sfs->count == 0) cv_signal(&sfs->cv); mtx_unlock(&sfs->mtx); } } /* * Same as above, but forces the page to be detached from the object * and go into free pool. */ void sf_ext_free_nocache(void *arg1, void *arg2) { struct sf_buf *sf = arg1; struct sendfile_sync *sfs = arg2; vm_page_t pg = sf_buf_page(sf); sf_buf_free(sf); vm_page_lock(pg); if (vm_page_unwire(pg, PQ_NONE)) { vm_object_t obj; /* Try to free the page, but only if it is cheap to. */ if ((obj = pg->object) == NULL) vm_page_free(pg); else if (!vm_page_xbusied(pg) && VM_OBJECT_TRYWLOCK(obj)) { vm_page_free(pg); VM_OBJECT_WUNLOCK(obj); } else vm_page_deactivate(pg); } vm_page_unlock(pg); if (sfs != NULL) { mtx_lock(&sfs->mtx); KASSERT(sfs->count > 0, ("Sendfile sync botchup count == 0")); if (--sfs->count == 0) cv_signal(&sfs->cv); mtx_unlock(&sfs->mtx); } } /* * sendfile(2) * * int sendfile(int fd, int s, off_t offset, size_t nbytes, * struct sf_hdtr *hdtr, off_t *sbytes, int flags) * * Send a file specified by 'fd' and starting at 'offset' to a socket * specified by 's'. Send only 'nbytes' of the file or until EOF if nbytes == * 0. Optionally add a header and/or trailer to the socket output. If * specified, write the total number of bytes sent into *sbytes. */ int sys_sendfile(struct thread *td, struct sendfile_args *uap) { return (do_sendfile(td, uap, 0)); } static int do_sendfile(struct thread *td, struct sendfile_args *uap, int compat) { struct sf_hdtr hdtr; struct uio *hdr_uio, *trl_uio; struct file *fp; cap_rights_t rights; off_t sbytes; int error; /* * File offset must be positive. If it goes beyond EOF * we send only the header/trailer and no payload data. */ if (uap->offset < 0) return (EINVAL); hdr_uio = trl_uio = NULL; if (uap->hdtr != NULL) { error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); if (error != 0) goto out; if (hdtr.headers != NULL) { error = copyinuio(hdtr.headers, hdtr.hdr_cnt, &hdr_uio); if (error != 0) goto out; } if (hdtr.trailers != NULL) { error = copyinuio(hdtr.trailers, hdtr.trl_cnt, &trl_uio); if (error != 0) goto out; } } AUDIT_ARG_FD(uap->fd); /* * sendfile(2) can start at any offset within a file so we require * CAP_READ+CAP_SEEK = CAP_PREAD. */ if ((error = fget_read(td, uap->fd, cap_rights_init(&rights, CAP_PREAD), &fp)) != 0) { goto out; } error = fo_sendfile(fp, uap->s, hdr_uio, trl_uio, uap->offset, uap->nbytes, &sbytes, uap->flags, compat ? SFK_COMPAT : 0, td); fdrop(fp, td); if (uap->sbytes != NULL) copyout(&sbytes, uap->sbytes, sizeof(off_t)); out: free(hdr_uio, M_IOV); free(trl_uio, M_IOV); return (error); } #ifdef COMPAT_FREEBSD4 int freebsd4_sendfile(struct thread *td, struct freebsd4_sendfile_args *uap) { struct sendfile_args args; args.fd = uap->fd; args.s = uap->s; args.offset = uap->offset; args.nbytes = uap->nbytes; args.hdtr = uap->hdtr; args.sbytes = uap->sbytes; args.flags = uap->flags; return (do_sendfile(td, &args, 1)); } #endif /* COMPAT_FREEBSD4 */ /* * How much data to put into page i of n. * Only first and last pages are special. */ static inline off_t xfsize(int i, int n, off_t off, off_t len) { if (i == 0) return (omin(PAGE_SIZE - (off & PAGE_MASK), len)); if (i == n - 1 && ((off + len) & PAGE_MASK) > 0) return ((off + len) & PAGE_MASK); return (PAGE_SIZE); } /* * Offset within object for i page. */ static inline vm_offset_t vmoff(int i, off_t off) { if (i == 0) return ((vm_offset_t)off); return (trunc_page(off + i * PAGE_SIZE)); } /* * Pretend as if we don't have enough space, subtract xfsize() of * all pages that failed. */ static inline void fixspace(int old, int new, off_t off, int *space) { KASSERT(old > new, ("%s: old %d new %d", __func__, old, new)); /* Subtract last one. */ *space -= xfsize(old - 1, old, off, *space); old--; if (new == old) /* There was only one page. */ return; /* Subtract first one. */ if (new == 0) { *space -= xfsize(0, old, off, *space); new++; } /* Rest of pages are full sized. */ *space -= (old - new) * PAGE_SIZE; KASSERT(*space >= 0, ("%s: space went backwards", __func__)); } /* * Structure describing a single sendfile(2) I/O, which may consist of * several underlying pager I/Os. * * The syscall context allocates the structure and initializes 'nios' * to 1. As sendfile_swapin() runs through pages and starts asynchronous * paging operations, it increments 'nios'. * * Every I/O completion calls sf_iodone(), which decrements the 'nios', and * the syscall also calls sf_iodone() after allocating all mbufs, linking them * and sending to socket. Whoever reaches zero 'nios' is responsible to * call pru_ready on the socket, to notify it of readyness of the data. */ struct sf_io { volatile u_int nios; u_int error; int npages; struct file *sock_fp; struct mbuf *m; vm_page_t pa[]; }; static void sf_iodone(void *arg, vm_page_t *pg, int count, int error) { struct sf_io *sfio = arg; struct socket *so; for (int i = 0; i < count; i++) vm_page_xunbusy(pg[i]); if (error) sfio->error = error; if (!refcount_release(&sfio->nios)) return; so = sfio->sock_fp->f_data; if (sfio->error) { struct mbuf *m; /* * I/O operation failed. The state of data in the socket * is now inconsistent, and all what we can do is to tear * it down. Protocol abort method would tear down protocol * state, free all ready mbufs and detach not ready ones. * We will free the mbufs corresponding to this I/O manually. * * The socket would be marked with EIO and made available * for read, so that application receives EIO on next * syscall and eventually closes the socket. */ so->so_proto->pr_usrreqs->pru_abort(so); so->so_error = EIO; m = sfio->m; for (int i = 0; i < sfio->npages; i++) m = m_free(m); } else { CURVNET_SET(so->so_vnet); (void )(so->so_proto->pr_usrreqs->pru_ready)(so, sfio->m, sfio->npages); CURVNET_RESTORE(); } /* XXXGL: curthread */ fdrop(sfio->sock_fp, curthread); free(sfio, M_TEMP); } /* * Iterate through pages vector and request paging for non-valid pages. */ static int sendfile_swapin(vm_object_t obj, struct sf_io *sfio, off_t off, off_t len, int npages, int rhpages, int flags) { vm_page_t *pa = sfio->pa; int nios; nios = 0; flags = (flags & SF_NODISKIO) ? VM_ALLOC_NOWAIT : 0; /* * First grab all the pages and wire them. Note that we grab * only required pages. Readahead pages are dealt with later. */ VM_OBJECT_WLOCK(obj); for (int i = 0; i < npages; i++) { pa[i] = vm_page_grab(obj, OFF_TO_IDX(vmoff(i, off)), VM_ALLOC_WIRED | VM_ALLOC_NORMAL | flags); if (pa[i] == NULL) { npages = i; rhpages = 0; break; } } for (int i = 0; i < npages;) { int j, a, count, rv; /* Skip valid pages. */ if (vm_page_is_valid(pa[i], vmoff(i, off) & PAGE_MASK, xfsize(i, npages, off, len))) { vm_page_xunbusy(pa[i]); SFSTAT_INC(sf_pages_valid); i++; continue; } /* * Now 'i' points to first invalid page, iterate further * to make 'j' point at first valid after a bunch of * invalid ones. */ for (j = i + 1; j < npages; j++) if (vm_page_is_valid(pa[j], vmoff(j, off) & PAGE_MASK, xfsize(j, npages, off, len))) { SFSTAT_INC(sf_pages_valid); break; } /* * Now we got region of invalid pages between 'i' and 'j'. * Check that they belong to pager. They may not be there, * which is a regular situation for shmem pager. For vnode * pager this happens only in case of sparse file. * * Important feature of vm_pager_has_page() is the hint * stored in 'a', about how many pages we can pagein after * this page in a single I/O. */ while (!vm_pager_has_page(obj, OFF_TO_IDX(vmoff(i, off)), NULL, &a) && i < j) { pmap_zero_page(pa[i]); pa[i]->valid = VM_PAGE_BITS_ALL; pa[i]->dirty = 0; vm_page_xunbusy(pa[i]); i++; } if (i == j) continue; /* * We want to pagein as many pages as possible, limited only * by the 'a' hint and actual request. * * We should not pagein into already valid page, thus if * 'j' didn't reach last page, trim by that page. * * When the pagein fulfils the request, also specify readahead. */ if (j < npages) a = min(a, j - i - 1); count = min(a + 1, npages - i); refcount_acquire(&sfio->nios); rv = vm_pager_get_pages_async(obj, pa + i, count, NULL, i + count == npages ? &rhpages : NULL, &sf_iodone, sfio); KASSERT(rv == VM_PAGER_OK, ("%s: pager fail obj %p page %p", __func__, obj, pa[i])); SFSTAT_INC(sf_iocnt); SFSTAT_ADD(sf_pages_read, count); if (i + count == npages) SFSTAT_ADD(sf_rhpages_read, rhpages); #ifdef INVARIANTS for (j = i; j < i + count && j < npages; j++) KASSERT(pa[j] == vm_page_lookup(obj, OFF_TO_IDX(vmoff(j, off))), ("pa[j] %p lookup %p\n", pa[j], vm_page_lookup(obj, OFF_TO_IDX(vmoff(j, off))))); #endif i += count; nios++; } VM_OBJECT_WUNLOCK(obj); if (nios == 0 && npages != 0) SFSTAT_INC(sf_noiocnt); return (nios); } static int sendfile_getobj(struct thread *td, struct file *fp, vm_object_t *obj_res, struct vnode **vp_res, struct shmfd **shmfd_res, off_t *obj_size, int *bsize) { struct vattr va; vm_object_t obj; struct vnode *vp; struct shmfd *shmfd; int error; vp = *vp_res = NULL; obj = NULL; shmfd = *shmfd_res = NULL; *bsize = 0; /* * The file descriptor must be a regular file and have a * backing VM object. */ if (fp->f_type == DTYPE_VNODE) { vp = fp->f_vnode; vn_lock(vp, LK_SHARED | LK_RETRY); if (vp->v_type != VREG) { error = EINVAL; goto out; } *bsize = vp->v_mount->mnt_stat.f_iosize; error = VOP_GETATTR(vp, &va, td->td_ucred); if (error != 0) goto out; *obj_size = va.va_size; obj = vp->v_object; if (obj == NULL) { error = EINVAL; goto out; } } else if (fp->f_type == DTYPE_SHM) { error = 0; shmfd = fp->f_data; obj = shmfd->shm_object; *obj_size = shmfd->shm_size; } else { error = EINVAL; goto out; } VM_OBJECT_WLOCK(obj); if ((obj->flags & OBJ_DEAD) != 0) { VM_OBJECT_WUNLOCK(obj); error = EBADF; goto out; } /* * Temporarily increase the backing VM object's reference * count so that a forced reclamation of its vnode does not * immediately destroy it. */ vm_object_reference_locked(obj); VM_OBJECT_WUNLOCK(obj); *obj_res = obj; *vp_res = vp; *shmfd_res = shmfd; out: if (vp != NULL) VOP_UNLOCK(vp, 0); return (error); } static int kern_sendfile_getsock(struct thread *td, int s, struct file **sock_fp, struct socket **so) { cap_rights_t rights; int error; *sock_fp = NULL; *so = NULL; /* * The socket must be a stream socket and connected. */ error = getsock_cap(td, s, cap_rights_init(&rights, CAP_SEND), sock_fp, NULL); if (error != 0) return (error); *so = (*sock_fp)->f_data; if ((*so)->so_type != SOCK_STREAM) return (EINVAL); if (((*so)->so_state & SS_ISCONNECTED) == 0) return (ENOTCONN); return (0); } int vn_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio, struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags, int kflags, struct thread *td) { struct file *sock_fp; struct vnode *vp; struct vm_object *obj; struct socket *so; struct mbuf *m, *mh, *mhtail; struct sf_buf *sf; struct shmfd *shmfd; struct sendfile_sync *sfs; struct vattr va; off_t off, sbytes, rem, obj_size; int error, softerr, bsize, hdrlen; obj = NULL; so = NULL; m = mh = NULL; sfs = NULL; sbytes = 0; softerr = 0; error = sendfile_getobj(td, fp, &obj, &vp, &shmfd, &obj_size, &bsize); if (error != 0) return (error); error = kern_sendfile_getsock(td, sockfd, &sock_fp, &so); if (error != 0) goto out; #ifdef MAC error = mac_socket_check_send(td->td_ucred, so); if (error != 0) goto out; #endif SFSTAT_INC(sf_syscalls); SFSTAT_ADD(sf_rhpages_requested, SF_READAHEAD(flags)); if (flags & SF_SYNC) { sfs = malloc(sizeof *sfs, M_TEMP, M_WAITOK | M_ZERO); mtx_init(&sfs->mtx, "sendfile", NULL, MTX_DEF); cv_init(&sfs->cv, "sendfile"); } /* If headers are specified copy them into mbufs. */ if (hdr_uio != NULL && hdr_uio->uio_resid > 0) { hdr_uio->uio_td = td; hdr_uio->uio_rw = UIO_WRITE; /* * In FBSD < 5.0 the nbytes to send also included * the header. If compat is specified subtract the * header size from nbytes. */ if (kflags & SFK_COMPAT) { if (nbytes > hdr_uio->uio_resid) nbytes -= hdr_uio->uio_resid; else nbytes = 0; } mh = m_uiotombuf(hdr_uio, M_WAITOK, 0, 0, 0); hdrlen = m_length(mh, &mhtail); } else hdrlen = 0; rem = nbytes ? omin(nbytes, obj_size - offset) : obj_size - offset; /* * Protect against multiple writers to the socket. * * XXXRW: Historically this has assumed non-interruptibility, so now * we implement that, but possibly shouldn't. */ (void)sblock(&so->so_snd, SBL_WAIT | SBL_NOINTR); /* * Loop through the pages of the file, starting with the requested * offset. Get a file page (do I/O if necessary), map the file page * into an sf_buf, attach an mbuf header to the sf_buf, and queue * it on the socket. * This is done in two loops. The inner loop turns as many pages * as it can, up to available socket buffer space, without blocking * into mbufs to have it bulk delivered into the socket send buffer. * The outer loop checks the state and available space of the socket * and takes care of the overall progress. */ for (off = offset; rem > 0; ) { struct sf_io *sfio; vm_page_t *pa; struct mbuf *mtail; int nios, space, npages, rhpages; mtail = NULL; /* * Check the socket state for ongoing connection, * no errors and space in socket buffer. * If space is low allow for the remainder of the * file to be processed if it fits the socket buffer. * Otherwise block in waiting for sufficient space * to proceed, or if the socket is nonblocking, return * to userland with EAGAIN while reporting how far * we've come. * We wait until the socket buffer has significant free * space to do bulk sends. This makes good use of file * system read ahead and allows packet segmentation * offloading hardware to take over lots of work. If * we were not careful here we would send off only one * sfbuf at a time. */ SOCKBUF_LOCK(&so->so_snd); if (so->so_snd.sb_lowat < so->so_snd.sb_hiwat / 2) so->so_snd.sb_lowat = so->so_snd.sb_hiwat / 2; retry_space: if (so->so_snd.sb_state & SBS_CANTSENDMORE) { error = EPIPE; SOCKBUF_UNLOCK(&so->so_snd); goto done; } else if (so->so_error) { error = so->so_error; so->so_error = 0; SOCKBUF_UNLOCK(&so->so_snd); goto done; } space = sbspace(&so->so_snd); if (space < rem && (space <= 0 || space < so->so_snd.sb_lowat)) { if (so->so_state & SS_NBIO) { SOCKBUF_UNLOCK(&so->so_snd); error = EAGAIN; goto done; } /* * sbwait drops the lock while sleeping. * When we loop back to retry_space the * state may have changed and we retest * for it. */ error = sbwait(&so->so_snd); /* * An error from sbwait usually indicates that we've * been interrupted by a signal. If we've sent anything * then return bytes sent, otherwise return the error. */ if (error != 0) { SOCKBUF_UNLOCK(&so->so_snd); goto done; } goto retry_space; } SOCKBUF_UNLOCK(&so->so_snd); /* * Reduce space in the socket buffer by the size of * the header mbuf chain. * hdrlen is set to 0 after the first loop. */ space -= hdrlen; if (vp != NULL) { error = vn_lock(vp, LK_SHARED); if (error != 0) goto done; error = VOP_GETATTR(vp, &va, td->td_ucred); if (error != 0 || off >= va.va_size) { VOP_UNLOCK(vp, 0); goto done; } if (va.va_size != obj_size) { if (nbytes == 0) rem += va.va_size - obj_size; else if (offset + nbytes > va.va_size) rem -= (offset + nbytes - va.va_size); obj_size = va.va_size; } } if (space > rem) space = rem; npages = howmany(space + (off & PAGE_MASK), PAGE_SIZE); /* * Calculate maximum allowed number of pages for readahead * at this iteration. First, we allow readahead up to "rem". * If application wants more, let it be, but there is no * reason to go above MAXPHYS. Also check against "obj_size", * since vm_pager_has_page() can hint beyond EOF. */ rhpages = howmany(rem + (off & PAGE_MASK), PAGE_SIZE) - npages; rhpages += SF_READAHEAD(flags); rhpages = min(howmany(MAXPHYS, PAGE_SIZE), rhpages); rhpages = min(howmany(obj_size - trunc_page(off), PAGE_SIZE) - npages, rhpages); sfio = malloc(sizeof(struct sf_io) + npages * sizeof(vm_page_t), M_TEMP, M_WAITOK); refcount_init(&sfio->nios, 1); sfio->error = 0; nios = sendfile_swapin(obj, sfio, off, space, npages, rhpages, flags); /* * Loop and construct maximum sized mbuf chain to be bulk * dumped into socket buffer. */ pa = sfio->pa; for (int i = 0; i < npages; i++) { struct mbuf *m0; /* * If a page wasn't grabbed successfully, then * trim the array. Can happen only with SF_NODISKIO. */ if (pa[i] == NULL) { SFSTAT_INC(sf_busy); fixspace(npages, i, off, &space); npages = i; softerr = EBUSY; break; } /* * Get a sendfile buf. When allocating the * first buffer for mbuf chain, we usually * wait as long as necessary, but this wait * can be interrupted. For consequent * buffers, do not sleep, since several * threads might exhaust the buffers and then * deadlock. */ sf = sf_buf_alloc(pa[i], m != NULL ? SFB_NOWAIT : SFB_CATCH); if (sf == NULL) { SFSTAT_INC(sf_allocfail); for (int j = i; j < npages; j++) { vm_page_lock(pa[j]); vm_page_unwire(pa[j], PQ_INACTIVE); vm_page_unlock(pa[j]); } if (m == NULL) softerr = ENOBUFS; fixspace(npages, i, off, &space); npages = i; break; } m0 = m_get(M_WAITOK, MT_DATA); m0->m_ext.ext_buf = (char *)sf_buf_kva(sf); m0->m_ext.ext_size = PAGE_SIZE; m0->m_ext.ext_arg1 = sf; m0->m_ext.ext_arg2 = sfs; /* * SF_NOCACHE sets the page as being freed upon send. * However, we ignore it for the last page in 'space', * if the page is truncated, and we got more data to * send (rem > space), or if we have readahead * configured (rhpages > 0). */ if ((flags & SF_NOCACHE) == 0 || (i == npages - 1 && ((off + space) & PAGE_MASK) && (rem > space || rhpages > 0))) m0->m_ext.ext_type = EXT_SFBUF; else m0->m_ext.ext_type = EXT_SFBUF_NOCACHE; m0->m_ext.ext_flags = 0; m0->m_flags |= (M_EXT | M_RDONLY); if (nios) m0->m_flags |= M_NOTREADY; m0->m_data = (char *)sf_buf_kva(sf) + (vmoff(i, off) & PAGE_MASK); m0->m_len = xfsize(i, npages, off, space); if (i == 0) sfio->m = m0; /* Append to mbuf chain. */ if (mtail != NULL) mtail->m_next = m0; else m = m0; mtail = m0; if (sfs != NULL) { mtx_lock(&sfs->mtx); sfs->count++; mtx_unlock(&sfs->mtx); } } if (vp != NULL) VOP_UNLOCK(vp, 0); /* Keep track of bytes processed. */ off += space; rem -= space; /* Prepend header, if any. */ if (hdrlen) { mhtail->m_next = m; m = mh; mh = NULL; } if (m == NULL) { KASSERT(softerr, ("%s: m NULL, no error", __func__)); error = softerr; free(sfio, M_TEMP); goto done; } /* Add the buffer chain to the socket buffer. */ KASSERT(m_length(m, NULL) == space + hdrlen, ("%s: mlen %u space %d hdrlen %d", __func__, m_length(m, NULL), space, hdrlen)); CURVNET_SET(so->so_vnet); if (nios == 0) { /* * If sendfile_swapin() didn't initiate any I/Os, * which happens if all data is cached in VM, then * we can send data right now without the * PRUS_NOTREADY flag. */ free(sfio, M_TEMP); error = (*so->so_proto->pr_usrreqs->pru_send) (so, 0, m, NULL, NULL, td); } else { sfio->sock_fp = sock_fp; sfio->npages = npages; fhold(sock_fp); error = (*so->so_proto->pr_usrreqs->pru_send) (so, PRUS_NOTREADY, m, NULL, NULL, td); sf_iodone(sfio, NULL, 0, 0); } CURVNET_RESTORE(); m = NULL; /* pru_send always consumes */ if (error) goto done; sbytes += space + hdrlen; if (hdrlen) hdrlen = 0; if (softerr) { error = softerr; goto done; } } /* * Send trailers. Wimp out and use writev(2). */ if (trl_uio != NULL) { sbunlock(&so->so_snd); error = kern_writev(td, sockfd, trl_uio); if (error == 0) sbytes += td->td_retval[0]; goto out; } done: sbunlock(&so->so_snd); out: /* * If there was no error we have to clear td->td_retval[0] * because it may have been set by writev. */ if (error == 0) { td->td_retval[0] = 0; } if (sent != NULL) { (*sent) = sbytes; } if (obj != NULL) vm_object_deallocate(obj); if (so) fdrop(sock_fp, td); if (m) m_freem(m); if (mh) m_freem(mh); if (sfs != NULL) { mtx_lock(&sfs->mtx); if (sfs->count != 0) cv_wait(&sfs->cv, &sfs->mtx); KASSERT(sfs->count == 0, ("sendfile sync still busy")); cv_destroy(&sfs->cv); mtx_destroy(&sfs->mtx); free(sfs, M_TEMP); } if (error == ERESTART) error = EINTR; return (error); }