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Make file descriptor passing work for CloudABI's sendmsg().

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Reduce the potential amount of code duplication between cloudabi32 and
cloudabi64 by creating a cloudabi_sock_recv() utility function. The
cloudabi32 and cloudabi64 modules will then only contain code to convert
the iovecs to the native pointer size.

In cloudabi_sock_recv(), we can now construct an SCM_RIGHTS cmsghdr in
an mbuf and pass that on to kern_sendit().
This commit is contained in:
Ed Schouten 2017-03-22 06:43:10 +00:00
parent 8b69c3e79f
commit 36cc183884
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=315700
4 changed files with 82 additions and 42 deletions
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50
sys/compat/cloudabi/cloudabi_sock.c
View File

@ -30,7 +30,9 @@ __FBSDID("$FreeBSD$");
#include <sys/capsicum.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
@ -243,3 +245,51 @@ cloudabi_sys_sock_stat_get(struct thread *td,
fdrop(fp, td);
return (copyout(&ss, uap->buf, sizeof(ss)));
}
int
cloudabi_sock_send(struct thread *td, cloudabi_fd_t fd, struct iovec *data,
size_t datalen, const cloudabi_fd_t *fds, size_t fdslen,
cloudabi_msgflags_t flags, size_t *rdatalen)
{
struct msghdr hdr = {
.msg_iov = data,
.msg_iovlen = datalen,
};
struct mbuf *control;
int error, mflags;
/* Convert flags. */
mflags = MSG_NOSIGNAL;
if (flags & CLOUDABI_MSG_EOR)
mflags |= MSG_EOR;
/* Convert file descriptor array to an SCM_RIGHTS message. */
if (fdslen > MCLBYTES || CMSG_SPACE(fdslen * sizeof(int)) > MCLBYTES) {
return (EINVAL);
} else if (fdslen > 0) {
struct cmsghdr *chdr;
control = m_get2(CMSG_SPACE(fdslen * sizeof(int)),
M_WAITOK, MT_CONTROL, 0);
control->m_len = CMSG_SPACE(fdslen * sizeof(int));
chdr = mtod(control, struct cmsghdr *);
chdr->cmsg_len = CMSG_LEN(fdslen * sizeof(int));
chdr->cmsg_level = SOL_SOCKET;
chdr->cmsg_type = SCM_RIGHTS;
error = copyin(fds, CMSG_DATA(chdr), fdslen * sizeof(int));
if (error != 0) {
m_free(control);
return (error);
}
} else {
control = NULL;
}
error = kern_sendit(td, fd, &hdr, mflags, control, UIO_USERSPACE);
if (error != 0)
return (error);
*rdatalen = td->td_retval[0];
td->td_retval[0] = 0;
return (0);
}

4
sys/compat/cloudabi/cloudabi_util.h
View File

@ -77,6 +77,10 @@ int cloudabi_futex_lock_wrlock(struct thread *, cloudabi_lock_t *,
cloudabi_scope_t, cloudabi_clockid_t, cloudabi_timestamp_t,
cloudabi_timestamp_t);
/* Socket operations. */
int cloudabi_sock_send(struct thread *, cloudabi_fd_t, struct iovec *, size_t,
const cloudabi_fd_t *, size_t, cloudabi_msgflags_t, size_t *);
/* vDSO setup and teardown. */
void cloudabi_vdso_init(struct sysentvec *, char *, char *);
void cloudabi_vdso_destroy(struct sysentvec *);

35
sys/compat/cloudabi32/cloudabi32_sock.c
View File

@ -1,5 +1,5 @@
/*-
* Copyright (c) 2015 Nuxi, https://nuxi.nl/
* Copyright (c) 2015-2017 Nuxi, https://nuxi.nl/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -105,44 +105,37 @@ cloudabi32_sys_sock_send(struct thread *td,
cloudabi32_send_in_t si;
cloudabi32_send_out_t so = {};
cloudabi32_ciovec_t iovobj;
struct msghdr msghdr = {};
struct iovec *iov;
const cloudabi32_ciovec_t *user_iov;
size_t i;
int error, flags;
size_t datalen, i;
int error;
error = copyin(uap->in, &si, sizeof(si));
if (error != 0)
return (error);
/* Convert results in cloudabi_send_in_t to struct msghdr. */
/* Convert iovecs to native format. */
if (si.si_data_len > UIO_MAXIOV)
return (EINVAL);
msghdr.msg_iovlen = si.si_data_len;
msghdr.msg_iov = malloc(msghdr.msg_iovlen * sizeof(struct iovec),
iov = malloc(si.si_data_len * sizeof(struct iovec),
M_SOCKET, M_WAITOK);
user_iov = TO_PTR(si.si_data);
for (i = 0; i < msghdr.msg_iovlen; i++) {
for (i = 0; i < si.si_data_len; i++) {
error = copyin(&user_iov[i], &iovobj, sizeof(iovobj));
if (error != 0) {
free(msghdr.msg_iov, M_SOCKET);
free(iov, M_SOCKET);
return (error);
}
msghdr.msg_iov[i].iov_base = TO_PTR(iovobj.buf);
msghdr.msg_iov[i].iov_len = iovobj.buf_len;
iov[i].iov_base = TO_PTR(iovobj.buf);
iov[i].iov_len = iovobj.buf_len;
}
flags = MSG_NOSIGNAL;
if (si.si_flags & CLOUDABI_MSG_EOR)
flags |= MSG_EOR;
/* TODO(ed): Add file descriptor passing. */
error = kern_sendit(td, uap->sock, &msghdr, flags, NULL, UIO_USERSPACE);
free(msghdr.msg_iov, M_SOCKET);
error = cloudabi_sock_send(td, uap->sock, iov, si.si_data_len,
TO_PTR(si.si_fds), si.si_fds_len, si.si_flags, &datalen);
free(iov, M_SOCKET);
if (error != 0)
return (error);
/* Convert results in msghdr to cloudabi_send_out_t. */
so.so_datalen = td->td_retval[0];
td->td_retval[0] = 0;
so.so_datalen = datalen;
return (copyout(&so, uap->out, sizeof(so)));
}

35
sys/compat/cloudabi64/cloudabi64_sock.c
View File

@ -1,5 +1,5 @@
/*-
* Copyright (c) 2015 Nuxi, https://nuxi.nl/
* Copyright (c) 2015-2017 Nuxi, https://nuxi.nl/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -105,44 +105,37 @@ cloudabi64_sys_sock_send(struct thread *td,
cloudabi64_send_in_t si;
cloudabi64_send_out_t so = {};
cloudabi64_ciovec_t iovobj;
struct msghdr msghdr = {};
struct iovec *iov;
const cloudabi64_ciovec_t *user_iov;
size_t i;
int error, flags;
size_t datalen, i;
int error;
error = copyin(uap->in, &si, sizeof(si));
if (error != 0)
return (error);
/* Convert results in cloudabi_send_in_t to struct msghdr. */
/* Convert iovecs to native format. */
if (si.si_data_len > UIO_MAXIOV)
return (EINVAL);
msghdr.msg_iovlen = si.si_data_len;
msghdr.msg_iov = malloc(msghdr.msg_iovlen * sizeof(struct iovec),
iov = malloc(si.si_data_len * sizeof(struct iovec),
M_SOCKET, M_WAITOK);
user_iov = TO_PTR(si.si_data);
for (i = 0; i < msghdr.msg_iovlen; i++) {
for (i = 0; i < si.si_data_len; i++) {
error = copyin(&user_iov[i], &iovobj, sizeof(iovobj));
if (error != 0) {
free(msghdr.msg_iov, M_SOCKET);
free(iov, M_SOCKET);
return (error);
}
msghdr.msg_iov[i].iov_base = TO_PTR(iovobj.buf);
msghdr.msg_iov[i].iov_len = iovobj.buf_len;
iov[i].iov_base = TO_PTR(iovobj.buf);
iov[i].iov_len = iovobj.buf_len;
}
flags = MSG_NOSIGNAL;
if (si.si_flags & CLOUDABI_MSG_EOR)
flags |= MSG_EOR;
/* TODO(ed): Add file descriptor passing. */
error = kern_sendit(td, uap->sock, &msghdr, flags, NULL, UIO_USERSPACE);
free(msghdr.msg_iov, M_SOCKET);
error = cloudabi_sock_send(td, uap->sock, iov, si.si_data_len,
TO_PTR(si.si_fds), si.si_fds_len, si.si_flags, &datalen);
free(iov, M_SOCKET);
if (error != 0)
return (error);
/* Convert results in msghdr to cloudabi_send_out_t. */
so.so_datalen = td->td_retval[0];
td->td_retval[0] = 0;
so.so_datalen = datalen;
return (copyout(&so, uap->out, sizeof(so)));
}