uipc_syscalls.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

		syscallarg(struct sockaddr *) from;
		syscallarg(socklen_t *) fromlenaddr;
	} */ *uap = v;
	struct msghdr msg;
	struct iovec aiov;
	int error;

	if (SCARG(uap, fromlenaddr)) {
		error = copyin((caddr_t)SCARG(uap, fromlenaddr),
			       (caddr_t)&msg.msg_namelen,
			       sizeof (msg.msg_namelen));
		if (error)
			return (error);
	} else
		msg.msg_namelen = 0;
	msg.msg_name = (caddr_t)SCARG(uap, from);
	msg.msg_iov = &aiov;
	msg.msg_iovlen = 1;
	aiov.iov_base = SCARG(uap, buf);
	aiov.iov_len = SCARG(uap, len);
	msg.msg_control = 0;
	msg.msg_flags = SCARG(uap, flags);
	return (recvit(p, SCARG(uap, s), &msg,
		       (caddr_t)SCARG(uap, fromlenaddr), retval));
}

int
sys_recvmsg(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_recvmsg_args /* {
		syscallarg(int) s;
		syscallarg(struct msghdr *) msg;
		syscallarg(int) flags;
	} */ *uap = v;
	struct msghdr msg;
	struct iovec aiov[UIO_SMALLIOV], *uiov, *iov;
	register int error;

	error = copyin((caddr_t)SCARG(uap, msg), (caddr_t)&msg,
		       sizeof (msg));
	if (error)
		return (error);
	if (msg.msg_iovlen <= 0 || msg.msg_iovlen > IOV_MAX)
		return (EMSGSIZE);
	if (msg.msg_iovlen > UIO_SMALLIOV)
		MALLOC(iov, struct iovec *,
		       sizeof(struct iovec) * msg.msg_iovlen, M_IOV, M_WAITOK);
	else
		iov = aiov;
#ifdef COMPAT_OLDSOCK
	msg.msg_flags = SCARG(uap, flags) &~ MSG_COMPAT;
#else
	msg.msg_flags = SCARG(uap, flags);
#endif
	uiov = msg.msg_iov;
	msg.msg_iov = iov;
	error = copyin((caddr_t)uiov, (caddr_t)iov,
		       (unsigned)(msg.msg_iovlen * sizeof (struct iovec)));
	if (error)
		goto done;
	if ((error = recvit(p, SCARG(uap, s), &msg, (caddr_t)0, retval)) == 0) {
		msg.msg_iov = uiov;
		error = copyout((caddr_t)&msg, (caddr_t)SCARG(uap, msg),
		    sizeof(msg));
	}
done:
	if (iov != aiov)
		FREE(iov, M_IOV);
	return (error);
}

int
recvit(p, s, mp, namelenp, retsize)
	register struct proc *p;
	int s;
	register struct msghdr *mp;
	caddr_t namelenp;
	register_t *retsize;
{
	struct file *fp;
	struct uio auio;
	register struct iovec *iov;
	register int i;
	size_t len;
	int error;
	struct mbuf *from = 0, *control = 0;
#ifdef KTRACE
	struct iovec *ktriov = NULL;
#endif
	
	if ((error = getsock(p->p_fd, s, &fp)) != 0)
		return (error);
	auio.uio_iov = mp->msg_iov;
	auio.uio_iovcnt = mp->msg_iovlen;
	auio.uio_segflg = UIO_USERSPACE;
	auio.uio_rw = UIO_READ;
	auio.uio_procp = p;
	auio.uio_offset = 0;			/* XXX */
	auio.uio_resid = 0;
	iov = mp->msg_iov;
	for (i = 0; i < mp->msg_iovlen; i++, iov++) {
		/* Don't allow sum > SSIZE_MAX */
		if (iov->iov_len > SSIZE_MAX ||
		    (auio.uio_resid += iov->iov_len) > SSIZE_MAX)
			return (EINVAL);
	}
#ifdef KTRACE
	if (KTRPOINT(p, KTR_GENIO)) {
		int iovlen = auio.uio_iovcnt * sizeof (struct iovec);

		MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
		bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
	}
#endif
	len = auio.uio_resid;
	error = soreceive((struct socket *)fp->f_data, &from, &auio,
			  NULL, mp->msg_control ? &control : NULL,
			  &mp->msg_flags);
	if (error) {
		if (auio.uio_resid != len && (error == ERESTART ||
		    error == EINTR || error == EWOULDBLOCK))
			error = 0;
	}
#ifdef KTRACE
	if (ktriov != NULL) {
		if (error == 0)
			ktrgenio(p->p_tracep, s, UIO_READ,
				ktriov, len - auio.uio_resid, error);
		FREE(ktriov, M_TEMP);
	}
#endif
	if (error)
		goto out;
	*retsize = len - auio.uio_resid;
	if (mp->msg_name) {
		len = mp->msg_namelen;
		if (len <= 0 || from == 0)
			len = 0;
		else {
		        /* save sa_len before it is destroyed by MSG_COMPAT */
			if (len > from->m_len)
				len = from->m_len;
			/* else if len < from->m_len ??? */
#ifdef COMPAT_OLDSOCK
			if (mp->msg_flags & MSG_COMPAT)
				mtod(from, struct osockaddr *)->sa_family =
				    mtod(from, struct sockaddr *)->sa_family;
#endif
			error = copyout(mtod(from, caddr_t),
			    (caddr_t)mp->msg_name, (unsigned)len);
			if (error)
				goto out;
		}
		mp->msg_namelen = len;
		if (namelenp &&
		    (error = copyout((caddr_t)&len, namelenp, sizeof (int)))) {
#ifdef COMPAT_OLDSOCK
			if (mp->msg_flags & MSG_COMPAT)
				error = 0;	/* old recvfrom didn't check */
			else
#endif
			goto out;
		}
	}
	if (mp->msg_control) {
#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;
		if (len <= 0 || control == 0)
			len = 0;
		else {
			if (len >= control->m_len)
				len = control->m_len;
			else
				mp->msg_flags |= MSG_CTRUNC;
			error = copyout((caddr_t)mtod(control, caddr_t),
			    (caddr_t)mp->msg_control, (unsigned)len);
		}
		mp->msg_controllen = len;
	}
out:
	if (from)
		m_freem(from);
	if (control)
		m_freem(control);
	return (error);
}

/* ARGSUSED */
int
sys_shutdown(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_shutdown_args /* {
		syscallarg(int) s;
		syscallarg(int) how;
	} */ *uap = v;
	struct file *fp;
	int error;

	if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0)
		return (error);
	return (soshutdown((struct socket *)fp->f_data, SCARG(uap, how)));
}

/* ARGSUSED */
int
sys_setsockopt(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_setsockopt_args /* {
		syscallarg(int) s;
		syscallarg(int) level;
		syscallarg(int) name;
		syscallarg(caddr_t) val;
		syscallarg(socklen_t) valsize;
	} */ *uap = v;
	struct file *fp;
	struct mbuf *m = NULL;
	int error;

	if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0)
		return (error);
	if (SCARG(uap, valsize) > MLEN)
		return (EINVAL);
	if (SCARG(uap, val)) {
		m = m_get(M_WAIT, MT_SOOPTS);
		if (m == NULL)
			return (ENOBUFS);
		error = copyin(SCARG(uap, val), mtod(m, caddr_t),
			       SCARG(uap, valsize));
		if (error) {
			(void) m_free(m);
			return (error);
		}
		m->m_len = SCARG(uap, valsize);
	}
	return (sosetopt((struct socket *)fp->f_data, SCARG(uap, level),
			 SCARG(uap, name), m));
}

/* ARGSUSED */
int
sys_getsockopt(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_getsockopt_args /* {
		syscallarg(int) s;
		syscallarg(int) level;
		syscallarg(int) name;
		syscallarg(caddr_t) val;
		syscallarg(socklen_t *) avalsize;
	} */ *uap = v;
	struct file *fp;
	struct mbuf *m = NULL;
	socklen_t valsize;
	int error;

	if ((error = getsock(p->p_fd, SCARG(uap, s), &fp)) != 0)
		return (error);
	if (SCARG(uap, val)) {
		error = copyin((caddr_t)SCARG(uap, avalsize),
			       (caddr_t)&valsize, sizeof (valsize));
		if (error)
			return (error);
	} else
		valsize = 0;
	if ((error = sogetopt((struct socket *)fp->f_data, SCARG(uap, level),
	    SCARG(uap, name), &m)) == 0 && SCARG(uap, val) && valsize &&
	    m != NULL) {
		if (valsize > m->m_len)
			valsize = m->m_len;
		error = copyout(mtod(m, caddr_t), SCARG(uap, val), valsize);
		if (error == 0)
			error = copyout((caddr_t)&valsize,
			    (caddr_t)SCARG(uap, avalsize), sizeof (valsize));
	}
	if (m != NULL)
		(void) m_free(m);
	return (error);
}

#ifdef NOTUSED_BY_PMON
int
sys_pipe(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_pipe_args /* {
		syscallarg(int *) fdp;
	} */ *uap = v;
	int error, fds[2];
	register_t rval[2];

	if ((error = sys_opipe(p, v, rval)) == -1)
		return (error);
	
	fds[0] = rval[0];
	fds[1] = rval[1];
	error = copyout((caddr_t)fds, (caddr_t)SCARG(uap, fdp),
	    2 * sizeof (int));
	if (error) {
		fdrelease(p, retval[0]);
		fdrelease(p, retval[1]);
	}
	return (error);
}

#ifdef OLD_PIPE

/* ARGSUSED */
int
sys_opipe(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct filedesc *fdp = p->p_fd;
	struct file *rf, *wf;
	struct socket *rso, *wso;
	int fd, error;

	if ((error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0)) != 0)
		return (error);
	if ((error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0)) != 0)
		goto free1;
	if ((error = falloc(p, &rf, &fd)) != 0)
		goto free2;
	retval[0] = fd;
	rf->f_flag = FREAD;
	rf->f_type = DTYPE_SOCKET;
	rf->f_ops = &socketops;
	rf->f_data = (caddr_t)rso;
	if ((error = falloc(p, &wf, &fd)) != 0)
		goto free3;
	wf->f_flag = FWRITE;
	wf->f_type = DTYPE_SOCKET;
	wf->f_ops = &socketops;
	wf->f_data = (caddr_t)wso;
	retval[1] = fd;
	if ((error = unp_connect2(wso, rso)) != 0)
		goto free4;
	return (0);
free4:
	ffree(wf);
	fdremove(fdp, retval[1]);
free3:
	ffree(rf);
	fdremove(fdp, retval[0]);
free2:
	(void)soclose(wso);
free1:
	(void)soclose(rso);
	return (error);
}
#endif
#endif /* NOTUSED_BY_PMON */

/*
 * Get socket name.
 */
/* ARGSUSED */
int
sys_getsockname(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_getsockname_args /* {
		syscallarg(int) fdes;
		syscallarg(caddr_t) asa;
		syscallarg(socklen_t *) alen;
	} */ *uap = v;
	struct file *fp;
	register struct socket *so;
	struct mbuf *m;
	socklen_t len;
	int error;

	if ((error = getsock(p->p_fd, SCARG(uap, fdes), &fp)) != 0)
		return (error);
	error = copyin((caddr_t)SCARG(uap, alen), (caddr_t)&len, sizeof (len));
	if (error)
		return (error);
	so = (struct socket *)fp->f_data;
	m = m_getclr(M_WAIT, MT_SONAME);
	if (m == NULL)
		return (ENOBUFS);
	error = (*so->so_proto->pr_usrreq)(so, PRU_SOCKADDR, 0, m, 0);
	if (error)
		goto bad;
	if (len > m->m_len)
		len = m->m_len;
	error = copyout(mtod(m, caddr_t), (caddr_t)SCARG(uap, asa), len);
	if (error == 0)
		error = copyout((caddr_t)&len, (caddr_t)SCARG(uap, alen),
		    sizeof (len));
bad:
	m_freem(m);
	return (error);
}

/*
 * Get name of peer for connected socket.
 */
/* ARGSUSED */
int
sys_getpeername(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_getpeername_args /* {
		syscallarg(int) fdes;
		syscallarg(caddr_t) asa;
		syscallarg(socklen_t *) alen;
	} */ *uap = v;
	struct file *fp;
	register struct socket *so;
	struct mbuf *m;
	socklen_t len;
	int error;

	if ((error = getsock(p->p_fd, SCARG(uap, fdes), &fp)) != 0)
		return (error);
	so = (struct socket *)fp->f_data;
	if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0)
		return (ENOTCONN);
	error = copyin((caddr_t)SCARG(uap, alen), (caddr_t)&len, sizeof (len));
	if (error)
		return (error);
	m = m_getclr(M_WAIT, MT_SONAME);
	if (m == NULL)
		return (ENOBUFS);
	error = (*so->so_proto->pr_usrreq)(so, PRU_PEERADDR, 0, m, 0);
	if (error)
		goto bad;
	if (len > m->m_len)
		len = m->m_len;
	error = copyout(mtod(m, caddr_t), (caddr_t)SCARG(uap, asa), len);
	if (error == 0)
		error = copyout((caddr_t)&len, (caddr_t)SCARG(uap, alen),
		    sizeof (len));
bad:
	m_freem(m);
	return (error);
}

int
sockargs(mp, buf, buflen, type)
	struct mbuf **mp;
	caddr_t buf;
	socklen_t buflen;
	int type;
{
	register struct sockaddr *sa;
	register 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
		return (EINVAL);
	}
	m = m_get(M_WAIT, type);
	if (m == NULL)
		return (ENOBUFS);
	m->m_len = buflen;
	error = copyin(buf, mtod(m, caddr_t), buflen);
	if (error) {
		(void) m_free(m);
		return (error);
	}
	*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 (0);
}

int
getsock(fdp, fdes, fpp)
	struct filedesc *fdp;
	int fdes;
	struct file **fpp;
{
	register struct file *fp;

	if ((unsigned)fdes >= fdp->fd_nfiles ||
	    (fp = fdp->fd_ofiles[fdes]) == NULL)
		return (EBADF);
	if (fp->f_type != DTYPE_SOCKET)
		return (ENOTSOCK);
	*fpp = fp;
	return (0);
}