/*- * 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_compat.h" #include "opt_ktrace.h" #include "opt_mac.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 #ifdef KTRACE #include #endif #include #include #include #include #include #include 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, struct accept_args *uap, int compat); 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); /* * NSFBUFS-related variables and associated sysctls */ int nsfbufs; int nsfbufspeak; int nsfbufsused; SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufs, CTLFLAG_RDTUN, &nsfbufs, 0, "Maximum number of sendfile(2) sf_bufs available"); SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufspeak, CTLFLAG_RD, &nsfbufspeak, 0, "Number of sendfile(2) sf_bufs at peak usage"); SYSCTL_INT(_kern_ipc, OID_AUTO, nsfbufsused, CTLFLAG_RD, &nsfbufsused, 0, "Number of sendfile(2) sf_bufs in use"); /* * Convert a user file descriptor to a kernel file entry. A reference on the * file entry is held upon returning. This is lighter weight than * fgetsock(), which bumps the socket reference drops the file reference * count instead, as this approach avoids several additional mutex operations * associated with the additional reference count. If requested, return the * open file flags. */ static int getsock(struct filedesc *fdp, int fd, struct file **fpp, u_int *fflagp) { struct file *fp; int error; fp = NULL; if (fdp == NULL) error = EBADF; else { FILEDESC_LOCK_FAST(fdp); fp = fget_locked(fdp, fd); if (fp == NULL) error = EBADF; else if (fp->f_type != DTYPE_SOCKET) { fp = NULL; error = ENOTSOCK; } else { fhold(fp); if (fflagp != NULL) *fflagp = fp->f_flag; error = 0; } FILEDESC_UNLOCK_FAST(fdp); } *fpp = fp; return (error); } /* * System call interface to the socket abstraction. */ #if defined(COMPAT_43) #define COMPAT_OLDSOCK #endif /* * MPSAFE */ int socket(td, uap) struct thread *td; register struct socket_args /* { int domain; int type; int protocol; } */ *uap; { struct filedesc *fdp; struct socket *so; struct file *fp; int fd, error; #ifdef MAC error = mac_check_socket_create(td->td_ucred, uap->domain, uap->type, uap->protocol); if (error) return (error); #endif fdp = td->td_proc->p_fd; error = falloc(td, &fp, &fd); if (error) return (error); /* An extra reference on `fp' has been held for us by falloc(). */ NET_LOCK_GIANT(); error = socreate(uap->domain, &so, uap->type, uap->protocol, td->td_ucred, td); NET_UNLOCK_GIANT(); if (error) { fdclose(fdp, fp, fd, td); } else { FILEDESC_LOCK_FAST(fdp); fp->f_data = so; /* already has ref count */ fp->f_flag = FREAD|FWRITE; fp->f_ops = &socketops; fp->f_type = DTYPE_SOCKET; FILEDESC_UNLOCK_FAST(fdp); td->td_retval[0] = fd; } fdrop(fp, td); return (error); } /* * MPSAFE */ /* ARGSUSED */ int bind(td, uap) struct thread *td; register struct bind_args /* { int s; caddr_t name; int namelen; } */ *uap; { struct sockaddr *sa; int error; if ((error = getsockaddr(&sa, uap->name, uap->namelen)) != 0) return (error); error = kern_bind(td, uap->s, sa); free(sa, M_SONAME); return (error); } int kern_bind(td, fd, sa) struct thread *td; int fd; struct sockaddr *sa; { struct socket *so; struct file *fp; int error; NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, fd, &fp, NULL); if (error) goto done2; so = fp->f_data; #ifdef MAC SOCK_LOCK(so); error = mac_check_socket_bind(td->td_ucred, so, sa); SOCK_UNLOCK(so); if (error) goto done1; #endif error = sobind(so, sa, td); #ifdef MAC done1: #endif fdrop(fp, td); done2: NET_UNLOCK_GIANT(); return (error); } /* * MPSAFE */ /* ARGSUSED */ int listen(td, uap) struct thread *td; register struct listen_args /* { int s; int backlog; } */ *uap; { struct socket *so; struct file *fp; int error; NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, uap->s, &fp, NULL); if (error == 0) { so = fp->f_data; #ifdef MAC SOCK_LOCK(so); error = mac_check_socket_listen(td->td_ucred, so); SOCK_UNLOCK(so); if (error) goto done; #endif error = solisten(so, uap->backlog, td); #ifdef MAC done: #endif fdrop(fp, td); } NET_UNLOCK_GIANT(); return(error); } /* * accept1() * MPSAFE */ static int accept1(td, uap, compat) struct thread *td; register struct accept_args /* { int s; struct sockaddr * __restrict name; socklen_t * __restrict anamelen; } */ *uap; int compat; { struct sockaddr *name; socklen_t namelen; struct file *fp; int error; if (uap->name == NULL) return (kern_accept(td, uap->s, NULL, NULL, NULL)); error = copyin(uap->anamelen, &namelen, sizeof (namelen)); if (error) return (error); error = kern_accept(td, uap->s, &name, &namelen, &fp); /* * return a namelen of zero for older code which might * ignore the return value from accept. */ if (error) { (void) copyout(&namelen, uap->anamelen, sizeof(*uap->anamelen)); return (error); } if (error == 0 && name != NULL) { #ifdef COMPAT_OLDSOCK if (compat) ((struct osockaddr *)name)->sa_family = name->sa_family; #endif error = copyout(name, uap->name, namelen); } if (error == 0) error = copyout(&namelen, uap->anamelen, sizeof(namelen)); if (error) fdclose(td->td_proc->p_fd, fp, td->td_retval[0], td); 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) { struct filedesc *fdp; struct file *headfp, *nfp = NULL; struct sockaddr *sa = NULL; int error; struct socket *head, *so; int fd; u_int fflag; pid_t pgid; int tmp; if (name) { *name = NULL; if (*namelen < 0) return (EINVAL); } fdp = td->td_proc->p_fd; NET_LOCK_GIANT(); error = getsock(fdp, s, &headfp, &fflag); if (error) goto done2; head = headfp->f_data; if ((head->so_options & SO_ACCEPTCONN) == 0) { error = EINVAL; goto done; } #ifdef MAC SOCK_LOCK(head); error = mac_check_socket_accept(td->td_ucred, head); SOCK_UNLOCK(head); if (error != 0) goto done; #endif error = falloc(td, &nfp, &fd); if (error) 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) { 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--; so->so_state |= (head->so_state & SS_NBIO); 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); pgid = fgetown(&head->so_sigio); if (pgid != 0) fsetown(pgid, &so->so_sigio); FILE_LOCK(nfp); nfp->f_data = so; /* nfp has ref count from falloc */ nfp->f_flag = fflag; nfp->f_ops = &socketops; nfp->f_type = DTYPE_SOCKET; FILE_UNLOCK(nfp); /* 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) { /* * return a namelen of zero for older code which might * ignore the return value from accept. */ if (name) *namelen = 0; goto noconnection; } if (sa == NULL) { if (name) *namelen = 0; goto done; } if (name) { /* check sa_len before it is destroyed */ if (*namelen > sa->sa_len) *namelen = sa->sa_len; *name = sa; sa = NULL; } noconnection: if (sa) FREE(sa, M_SONAME); /* * close the new descriptor, assuming someone hasn't ripped it * out from under us. */ if (error) fdclose(fdp, nfp, fd, td); /* * 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); done2: NET_UNLOCK_GIANT(); return (error); } /* * MPSAFE (accept1() is MPSAFE) */ int accept(td, uap) struct thread *td; struct accept_args *uap; { return (accept1(td, uap, 0)); } #ifdef COMPAT_OLDSOCK /* * MPSAFE (accept1() is MPSAFE) */ int oaccept(td, uap) struct thread *td; struct accept_args *uap; { return (accept1(td, uap, 1)); } #endif /* COMPAT_OLDSOCK */ /* * MPSAFE */ /* ARGSUSED */ int connect(td, uap) struct thread *td; register 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) return (error); error = kern_connect(td, uap->s, sa); free(sa, M_SONAME); return (error); } int kern_connect(td, fd, sa) struct thread *td; int fd; struct sockaddr *sa; { struct socket *so; struct file *fp; int error; int interrupted = 0; NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, fd, &fp, NULL); if (error) goto done2; so = fp->f_data; if (so->so_state & SS_ISCONNECTING) { error = EALREADY; goto done1; } #ifdef MAC SOCK_LOCK(so); error = mac_check_socket_connect(td->td_ucred, so, sa); SOCK_UNLOCK(so); if (error) goto bad; #endif error = soconnect(so, sa, td); if (error) 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) { 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); done2: NET_UNLOCK_GIANT(); return (error); } /* * MPSAFE */ int socketpair(td, uap) struct thread *td; register struct socketpair_args /* { int domain; int type; int protocol; int *rsv; } */ *uap; { register struct filedesc *fdp = td->td_proc->p_fd; struct file *fp1, *fp2; struct socket *so1, *so2; int fd, error, sv[2]; #ifdef MAC /* We might want to have a separate check for socket pairs. */ error = mac_check_socket_create(td->td_ucred, uap->domain, uap->type, uap->protocol); if (error) return (error); #endif NET_LOCK_GIANT(); error = socreate(uap->domain, &so1, uap->type, uap->protocol, td->td_ucred, td); if (error) goto done2; error = socreate(uap->domain, &so2, uap->type, uap->protocol, td->td_ucred, td); if (error) goto free1; /* On success extra reference to `fp1' and 'fp2' is set by falloc. */ error = falloc(td, &fp1, &fd); if (error) goto free2; sv[0] = fd; fp1->f_data = so1; /* so1 already has ref count */ error = falloc(td, &fp2, &fd); if (error) goto free3; fp2->f_data = so2; /* so2 already has ref count */ sv[1] = fd; error = soconnect2(so1, so2); if (error) goto free4; if (uap->type == SOCK_DGRAM) { /* * Datagram socket connection is asymmetric. */ error = soconnect2(so2, so1); if (error) goto free4; } FILE_LOCK(fp1); fp1->f_flag = FREAD|FWRITE; fp1->f_ops = &socketops; fp1->f_type = DTYPE_SOCKET; FILE_UNLOCK(fp1); FILE_LOCK(fp2); fp2->f_flag = FREAD|FWRITE; fp2->f_ops = &socketops; fp2->f_type = DTYPE_SOCKET; FILE_UNLOCK(fp2); error = copyout(sv, uap->rsv, 2 * sizeof (int)); fdrop(fp1, td); fdrop(fp2, td); goto done2; free4: fdclose(fdp, fp2, sv[1], td); fdrop(fp2, td); free3: fdclose(fdp, fp1, sv[0], td); fdrop(fp1, td); free2: (void)soclose(so2); free1: (void)soclose(so1); done2: NET_UNLOCK_GIANT(); return (error); } static int sendit(td, s, mp, flags) register struct thread *td; int s; register struct msghdr *mp; int flags; { struct mbuf *control; struct sockaddr *to; int error; if (mp->msg_name != NULL) { error = getsockaddr(&to, mp->msg_name, mp->msg_namelen); if (error) { 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) goto bad; #ifdef COMPAT_OLDSOCK if (mp->msg_flags == MSG_COMPAT) { register struct cmsghdr *cm; M_PREPEND(control, sizeof(*cm), M_TRYWAIT); if (control == 0) { error = ENOBUFS; goto bad; } else { 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: if (to) 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; int i; int len, error; #ifdef KTRACE struct uio *ktruio = NULL; #endif NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, s, &fp, NULL); if (error) goto bad2; so = (struct socket *)fp->f_data; #ifdef MAC SOCK_LOCK(so); error = mac_check_socket_send(td->td_ucred, so); SOCK_UNLOCK(so); if (error) 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) { 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); psignal(td->td_proc, 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); bad2: NET_UNLOCK_GIANT(); return (error); } /* * MPSAFE */ int sendto(td, uap) struct thread *td; register 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; int error; 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; error = sendit(td, uap->s, &msg, uap->flags); return (error); } #ifdef COMPAT_OLDSOCK /* * MPSAFE */ int osend(td, uap) struct thread *td; register struct osend_args /* { int s; caddr_t buf; int len; int flags; } */ *uap; { struct msghdr msg; struct iovec aiov; int error; 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; error = sendit(td, uap->s, &msg, uap->flags); return (error); } /* * MPSAFE */ 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) return (error); error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); if (error) 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 /* * MPSAFE */ int 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) return (error); error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); if (error) 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; int i; socklen_t len; int error; struct mbuf *m, *control = 0; caddr_t ctlbuf; struct file *fp; struct socket *so; struct sockaddr *fromsa = 0; #ifdef KTRACE struct uio *ktruio = NULL; #endif if(controlp != NULL) *controlp = 0; NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, s, &fp, NULL); if (error) { NET_UNLOCK_GIANT(); return (error); } so = fp->f_data; #ifdef MAC SOCK_LOCK(so); error = mac_check_socket_receive(td->td_ucred, so); SOCK_UNLOCK(so); if (error) { fdrop(fp, td); NET_UNLOCK_GIANT(); 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); NET_UNLOCK_GIANT(); return (EINVAL); } } #ifdef KTRACE if (KTRPOINT(td, KTR_GENIO)) ktruio = cloneuio(&auio); #endif len = auio.uio_resid; error = soreceive(so, &fromsa, &auio, (struct mbuf **)0, (mp->msg_control || controlp) ? &control : (struct mbuf **)0, &mp->msg_flags); if (error) { if (auio.uio_resid != (int)len && (error == ERESTART || error == EINTR || error == EWOULDBLOCK)) error = 0; } #ifdef KTRACE if (ktruio != NULL) { ktruio->uio_resid = (int)len - auio.uio_resid; ktrgenio(s, UIO_READ, ktruio, error); } #endif if (error) goto out; td->td_retval[0] = (int)len - auio.uio_resid; if (mp->msg_name) { len = mp->msg_namelen; if (len <= 0 || fromsa == 0) 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) 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); NET_UNLOCK_GIANT(); if (fromsa) 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) return (error); if (namelenp) { 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); } /* * MPSAFE */ int recvfrom(td, uap) struct thread *td; register 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) 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 /* * MPSAFE */ int orecvfrom(td, uap) struct thread *td; struct recvfrom_args *uap; { uap->flags |= MSG_COMPAT; return (recvfrom(td, uap)); } #endif #ifdef COMPAT_OLDSOCK /* * MPSAFE */ int orecv(td, uap) struct thread *td; register struct orecv_args /* { int s; caddr_t buf; int len; int flags; } */ *uap; { struct msghdr msg; struct iovec aiov; int error; 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; error = recvit(td, uap->s, &msg, NULL); return (error); } /* * 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. * * MPSAFE */ 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) return (error); error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); if (error) 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 /* * MPSAFE */ int 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) return (error); error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); if (error) 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); } /* * MPSAFE */ /* ARGSUSED */ int shutdown(td, uap) struct thread *td; register struct shutdown_args /* { int s; int how; } */ *uap; { struct socket *so; struct file *fp; int error; NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, uap->s, &fp, NULL); if (error == 0) { so = fp->f_data; error = soshutdown(so, uap->how); fdrop(fp, td); } NET_UNLOCK_GIANT(); return (error); } /* * MPSAFE */ /* ARGSUSED */ int setsockopt(td, uap) struct thread *td; register 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; { int error; struct socket *so; struct file *fp; struct sockopt sopt; 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"); } NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, s, &fp, NULL); if (error == 0) { so = fp->f_data; error = sosetopt(so, &sopt); fdrop(fp, td); } NET_UNLOCK_GIANT(); return(error); } /* * MPSAFE */ /* ARGSUSED */ int getsockopt(td, uap) struct thread *td; register 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) 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; { int error; struct socket *so; struct file *fp; struct sockopt sopt; 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"); } NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, s, &fp, NULL); if (error == 0) { so = fp->f_data; error = sogetopt(so, &sopt); *valsize = sopt.sopt_valsize; fdrop(fp, td); } NET_UNLOCK_GIANT(); return (error); } /* * getsockname1() - Get socket name. * * MPSAFE */ /* ARGSUSED */ static int getsockname1(td, uap, compat) struct thread *td; register 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) return (error); error = kern_getsockname(td, uap->fdes, &sa, &len); if (error) 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; socklen_t len; int error; if (*alen < 0) return (EINVAL); NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, fd, &fp, NULL); if (error) goto done; so = fp->f_data; *sa = NULL; error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, sa); if (error) goto bad; if (*sa == NULL) len = 0; else len = MIN(*alen, (*sa)->sa_len); *alen = len; bad: fdrop(fp, td); if (error && *sa) { free(*sa, M_SONAME); *sa = NULL; } done: NET_UNLOCK_GIANT(); return (error); } /* * MPSAFE */ int getsockname(td, uap) struct thread *td; struct getsockname_args *uap; { return (getsockname1(td, uap, 0)); } #ifdef COMPAT_OLDSOCK /* * MPSAFE */ 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. * * MPSAFE */ /* ARGSUSED */ static int getpeername1(td, uap, compat) struct thread *td; register 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) return (error); error = kern_getpeername(td, uap->fdes, &sa, &len); if (error) 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; socklen_t len; int error; if (*alen < 0) return (EINVAL); NET_LOCK_GIANT(); error = getsock(td->td_proc->p_fd, fd, &fp, NULL); if (error) goto done2; so = fp->f_data; if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { error = ENOTCONN; goto done1; } *sa = NULL; error = (*so->so_proto->pr_usrreqs->pru_peeraddr)(so, sa); if (error) goto bad; if (*sa == NULL) len = 0; else len = MIN(*alen, (*sa)->sa_len); *alen = len; bad: if (error && *sa) { free(*sa, M_SONAME); *sa = NULL; } done1: fdrop(fp, td); done2: NET_UNLOCK_GIANT(); return (error); } /* * MPSAFE */ int getpeername(td, uap) struct thread *td; struct getpeername_args *uap; { return (getpeername1(td, uap, 0)); } #ifdef COMPAT_OLDSOCK /* * MPSAFE */ 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; { register struct sockaddr *sa; register struct mbuf *m; int error; if ((u_int)buflen > MLEN) { #ifdef COMPAT_OLDSOCK if (type == MT_SONAME && (u_int)buflen <= 112) buflen = MLEN; /* unix domain compat. hack */ else #endif if ((u_int)buflen > MCLBYTES) return (EINVAL); } m = m_get(M_TRYWAIT, type); if (m == NULL) return (ENOBUFS); if ((u_int)buflen > MLEN) { MCLGET(m, M_TRYWAIT); if ((m->m_flags & M_EXT) == 0) { m_free(m); return (ENOBUFS); } } m->m_len = buflen; error = copyin(buf, mtod(m, caddr_t), (u_int)buflen); if (error) (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); MALLOC(sa, struct sockaddr *, len, M_SONAME, M_WAITOK); error = copyin(uaddr, sa, len); if (error) { 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); } /* * Detach mapped page and release resources back to the system. */ void sf_buf_mext(void *addr, void *args) { vm_page_t m; m = sf_buf_page(args); sf_buf_free(args); vm_page_lock_queues(); vm_page_unwire(m, 0); /* * 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 (m->wire_count == 0 && m->object == NULL) vm_page_free(m); vm_page_unlock_queues(); } /* * sendfile(2) * * MPSAFE * * 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 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; int error; hdr_uio = trl_uio = NULL; if (uap->hdtr != NULL) { error = copyin(uap->hdtr, &hdtr, sizeof(hdtr)); if (error) goto out; if (hdtr.headers != NULL) { error = copyinuio(hdtr.headers, hdtr.hdr_cnt, &hdr_uio); if (error) goto out; } if (hdtr.trailers != NULL) { error = copyinuio(hdtr.trailers, hdtr.trl_cnt, &trl_uio); if (error) goto out; } } error = kern_sendfile(td, uap, hdr_uio, trl_uio, compat); out: if (hdr_uio) free(hdr_uio, M_IOV); if (trl_uio) 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 */ int kern_sendfile(struct thread *td, struct sendfile_args *uap, struct uio *hdr_uio, struct uio *trl_uio, int compat) { struct file *sock_fp; struct vnode *vp; struct vm_object *obj = NULL; struct socket *so = NULL; struct mbuf *m, *m_header = NULL; struct sf_buf *sf; struct vm_page *pg; off_t off, xfsize, hdtr_size, sbytes = 0; int error, headersize = 0, headersent = 0; int vfslocked; NET_LOCK_GIANT(); hdtr_size = 0; /* * The descriptor must be a regular file and have a backing VM object. */ if ((error = fgetvp_read(td, uap->fd, &vp)) != 0) goto done; vfslocked = VFS_LOCK_GIANT(vp->v_mount); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); obj = vp->v_object; if (obj != NULL) { /* * Temporarily increase the backing VM object's reference * count so that a forced reclamation of its vnode does not * immediately destroy it. */ VM_OBJECT_LOCK(obj); if ((obj->flags & OBJ_DEAD) == 0) { vm_object_reference_locked(obj); VM_OBJECT_UNLOCK(obj); } else { VM_OBJECT_UNLOCK(obj); obj = NULL; } } VOP_UNLOCK(vp, 0, td); VFS_UNLOCK_GIANT(vfslocked); if (obj == NULL) { error = EINVAL; goto done; } if ((error = getsock(td->td_proc->p_fd, uap->s, &sock_fp, NULL)) != 0) goto done; so = sock_fp->f_data; if (so->so_type != SOCK_STREAM) { error = EINVAL; goto done; } if ((so->so_state & SS_ISCONNECTED) == 0) { error = ENOTCONN; goto done; } if (uap->offset < 0) { error = EINVAL; goto done; } #ifdef MAC SOCK_LOCK(so); error = mac_check_socket_send(td->td_ucred, so); SOCK_UNLOCK(so); if (error) goto done; #endif /* * If specified, get the pointer to the sf_hdtr struct for * any headers/trailers. */ if (hdr_uio != NULL) { hdr_uio->uio_td = td; hdr_uio->uio_rw = UIO_WRITE; if (hdr_uio->uio_resid > 0) { m_header = m_uiotombuf(hdr_uio, M_DONTWAIT, 0, 0); if (m_header == NULL) goto done; headersize = m_header->m_pkthdr.len; if (compat) sbytes += headersize; } } /* * Protect against multiple writers to the socket. */ SOCKBUF_LOCK(&so->so_snd); (void) sblock(&so->so_snd, M_WAITOK); SOCKBUF_UNLOCK(&so->so_snd); /* * Loop through the pages in 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. */ for (off = uap->offset; ; off += xfsize, sbytes += xfsize) { vm_pindex_t pindex; vm_offset_t pgoff; pindex = OFF_TO_IDX(off); VM_OBJECT_LOCK(obj); retry_lookup: /* * Calculate the amount to transfer. Not to exceed a page, * the EOF, or the passed in nbytes. */ xfsize = obj->un_pager.vnp.vnp_size - off; VM_OBJECT_UNLOCK(obj); if (xfsize > PAGE_SIZE) xfsize = PAGE_SIZE; pgoff = (vm_offset_t)(off & PAGE_MASK); if (PAGE_SIZE - pgoff < xfsize) xfsize = PAGE_SIZE - pgoff; if (uap->nbytes && xfsize > (uap->nbytes - sbytes)) xfsize = uap->nbytes - sbytes; if (xfsize <= 0) { if (m_header != NULL) { m = m_header; m_header = NULL; SOCKBUF_LOCK(&so->so_snd); goto retry_space; } else break; } /* * Optimize the non-blocking case by looking at the socket space * before going to the extra work of constituting the sf_buf. */ SOCKBUF_LOCK(&so->so_snd); if ((so->so_state & SS_NBIO) && sbspace(&so->so_snd) <= 0) { if (so->so_snd.sb_state & SBS_CANTSENDMORE) error = EPIPE; else error = EAGAIN; sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); goto done; } SOCKBUF_UNLOCK(&so->so_snd); VM_OBJECT_LOCK(obj); /* * Attempt to look up the page. * * Allocate if not found * * Wait and loop if busy. */ pg = vm_page_lookup(obj, pindex); if (pg == NULL) { pg = vm_page_alloc(obj, pindex, VM_ALLOC_NOBUSY | VM_ALLOC_NORMAL | VM_ALLOC_WIRED); if (pg == NULL) { VM_OBJECT_UNLOCK(obj); VM_WAIT; VM_OBJECT_LOCK(obj); goto retry_lookup; } } else if (vm_page_sleep_if_busy(pg, TRUE, "sfpbsy")) goto retry_lookup; else { /* * Wire the page so it does not get ripped out from * under us. */ vm_page_lock_queues(); vm_page_wire(pg); vm_page_unlock_queues(); } /* * If page is not valid for what we need, initiate I/O */ if (pg->valid && vm_page_is_valid(pg, pgoff, xfsize)) { VM_OBJECT_UNLOCK(obj); } else if (uap->flags & SF_NODISKIO) { error = EBUSY; } else { int bsize, resid; /* * Ensure that our page is still around when the I/O * completes. */ vm_page_io_start(pg); VM_OBJECT_UNLOCK(obj); /* * Get the page from backing store. */ bsize = vp->v_mount->mnt_stat.f_iosize; vfslocked = VFS_LOCK_GIANT(vp->v_mount); vn_lock(vp, LK_SHARED | LK_RETRY, td); /* * XXXMAC: Because we don't have fp->f_cred here, * we pass in NOCRED. This is probably wrong, but * is consistent with our original implementation. */ error = vn_rdwr(UIO_READ, vp, NULL, MAXBSIZE, trunc_page(off), UIO_NOCOPY, IO_NODELOCKED | IO_VMIO | ((MAXBSIZE / bsize) << IO_SEQSHIFT), td->td_ucred, NOCRED, &resid, td); VOP_UNLOCK(vp, 0, td); VFS_UNLOCK_GIANT(vfslocked); VM_OBJECT_LOCK(obj); vm_page_io_finish(pg); if (!error) VM_OBJECT_UNLOCK(obj); mbstat.sf_iocnt++; } if (error) { vm_page_lock_queues(); vm_page_unwire(pg, 0); /* * See if anyone else might know about this page. * If not and it is not valid, then free it. */ if (pg->wire_count == 0 && pg->valid == 0 && pg->busy == 0 && !(pg->flags & PG_BUSY) && pg->hold_count == 0) { vm_page_free(pg); } vm_page_unlock_queues(); VM_OBJECT_UNLOCK(obj); SOCKBUF_LOCK(&so->so_snd); sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); goto done; } /* * Get a sendfile buf. We usually wait as long as necessary, * but this wait can be interrupted. */ if ((sf = sf_buf_alloc(pg, SFB_CATCH)) == NULL) { mbstat.sf_allocfail++; vm_page_lock_queues(); vm_page_unwire(pg, 0); if (pg->wire_count == 0 && pg->object == NULL) vm_page_free(pg); vm_page_unlock_queues(); SOCKBUF_LOCK(&so->so_snd); sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); error = EINTR; goto done; } /* * Get an mbuf header and set it up as having external storage. */ if (m_header) MGET(m, M_TRYWAIT, MT_DATA); else MGETHDR(m, M_TRYWAIT, MT_DATA); if (m == NULL) { error = ENOBUFS; sf_buf_mext((void *)sf_buf_kva(sf), sf); SOCKBUF_LOCK(&so->so_snd); sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); goto done; } /* * Setup external storage for mbuf. */ MEXTADD(m, sf_buf_kva(sf), PAGE_SIZE, sf_buf_mext, sf, M_RDONLY, EXT_SFBUF); m->m_data = (char *)sf_buf_kva(sf) + pgoff; m->m_pkthdr.len = m->m_len = xfsize; if (m_header) { m_cat(m_header, m); m = m_header; m_header = NULL; m_fixhdr(m); } /* * Add the buffer to the socket buffer chain. */ SOCKBUF_LOCK(&so->so_snd); retry_space: /* * Make sure that the socket is still able to take more data. * CANTSENDMORE being true usually means that the connection * was closed. so_error is true when an error was sensed after * a previous send. * The state is checked after the page mapping and buffer * allocation above since those operations may block and make * any socket checks stale. From this point forward, nothing * blocks before the pru_send (or more accurately, any blocking * results in a loop back to here to re-check). */ SOCKBUF_LOCK_ASSERT(&so->so_snd); if ((so->so_snd.sb_state & SBS_CANTSENDMORE) || so->so_error) { if (so->so_snd.sb_state & SBS_CANTSENDMORE) { error = EPIPE; } else { error = so->so_error; so->so_error = 0; } m_freem(m); sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); goto done; } /* * Wait for socket space to become available. We do this just * after checking the connection state above in order to avoid * a race condition with sbwait(). */ if (sbspace(&so->so_snd) < so->so_snd.sb_lowat) { if (so->so_state & SS_NBIO) { m_freem(m); sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); error = EAGAIN; goto done; } 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) { m_freem(m); sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); goto done; } goto retry_space; } SOCKBUF_UNLOCK(&so->so_snd); error = (*so->so_proto->pr_usrreqs->pru_send)(so, 0, m, 0, 0, td); if (error) { SOCKBUF_LOCK(&so->so_snd); sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); goto done; } headersent = 1; } SOCKBUF_LOCK(&so->so_snd); sbunlock(&so->so_snd); SOCKBUF_UNLOCK(&so->so_snd); /* * Send trailers. Wimp out and use writev(2). */ if (trl_uio != NULL) { error = kern_writev(td, uap->s, trl_uio); if (error) goto done; if (compat) sbytes += td->td_retval[0]; else hdtr_size += td->td_retval[0]; } done: if (headersent) { if (!compat) hdtr_size += headersize; } else { if (compat) sbytes -= headersize; } /* * 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 (uap->sbytes != NULL) { if (!compat) sbytes += hdtr_size; copyout(&sbytes, uap->sbytes, sizeof(off_t)); } if (obj != NULL) vm_object_deallocate(obj); if (vp != NULL) { vfslocked = VFS_LOCK_GIANT(vp->v_mount); vrele(vp); VFS_UNLOCK_GIANT(vfslocked); } if (so) fdrop(sock_fp, td); if (m_header) m_freem(m_header); NET_UNLOCK_GIANT(); if (error == ERESTART) error = EINTR; return (error); }