/* $NetBSD: smb_trantcp.c,v 1.49 2015/05/22 22:05:32 rtr Exp $ */ /*- * Copyright (c) 2008 The NetBSD Foundation, Inc. * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * Copyright (c) 2000-2001 Boris Popov * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Boris Popov. * 4. Neither the name of the author nor the names of any co-contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. * * FreeBSD: src/sys/netsmb/smb_trantcp.c,v 1.17 2003/02/19 05:47:38 imp Exp */ #include __KERNEL_RCSID(0, "$NetBSD: smb_trantcp.c,v 1.49 2015/05/22 22:05:32 rtr Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int nb_tcpsndbuf = NB_SNDQ; static int nb_tcprcvbuf = NB_RCVQ; #define nb_sosend(so,m,flags,l) (*(so)->so_send)(so, NULL, (struct uio *)0, \ m, (struct mbuf *)0, flags, l) static int nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp, u_int8_t *rpcodep, bool firstwait, struct lwp *l); static int smb_nbst_disconnect(struct smb_vc *vcp, struct lwp *l); static int nb_setsockopt_int(struct socket *so, int level, int name, int val) { return so_setsockopt(NULL, so, level, name, &val, sizeof(val)); /* XXX */ } static int nb_intr(struct nbpcb *nbp, struct lwp *l) { return 0; } static void nb_upcall(struct socket *so, void *arg, int events, int waitflag) { struct nbpcb *nbp = (void *)arg; if (arg == NULL || nbp->nbp_selectid == NULL) return; wakeup(nbp->nbp_selectid); } static int nb_sethdr(struct mbuf *m, u_int8_t type, u_int32_t len) { u_int32_t *p = mtod(m, u_int32_t *); *p = htonl((len & 0x1FFFF) | (type << 24)); return 0; } static int nb_put_name(struct mbchain *mbp, struct sockaddr_nb *snb) { int error; u_char seglen, *cp; cp = snb->snb_name; if (*cp == 0) return EINVAL; NBDEBUG(("[%s]\n", cp)); for (;;) { seglen = (*cp) + 1; error = mb_put_mem(mbp, cp, seglen, MB_MSYSTEM); if (error) return error; if (seglen == 1) break; cp += seglen; } return 0; } static int nb_connect_in(struct nbpcb *nbp, struct sockaddr_in *to, struct lwp *l) { struct socket *so; int error; error = socreate(AF_INET, &so, SOCK_STREAM, IPPROTO_TCP, l, NULL); if (error) return error; solock(so); nbp->nbp_tso = so; so->so_upcallarg = (void *)nbp; so->so_upcall = nb_upcall; so->so_rcv.sb_flags |= SB_UPCALL; so->so_rcv.sb_flags &= ~SB_NOINTR; so->so_snd.sb_flags &= ~SB_NOINTR; so->so_rcv.sb_timeo = NB_RCVTIMEO * hz; so->so_snd.sb_timeo = NB_RCVTIMEO * hz; error = soreserve(so, nb_tcpsndbuf, nb_tcprcvbuf); sounlock(so); if (error) goto bad; nb_setsockopt_int(so, SOL_SOCKET, SO_KEEPALIVE, 1); nb_setsockopt_int(so, IPPROTO_TCP, TCP_NODELAY, 1); solock(so); error = soconnect(so, (struct sockaddr *)to, l); if (error) { sounlock(so); goto bad; } while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { sowait(so, false, 2 * hz); if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0 && (error = nb_intr(nbp, l)) != 0) { so->so_state &= ~SS_ISCONNECTING; sounlock(so); goto bad; } } if (so->so_error) { error = so->so_error; so->so_error = 0; sounlock(so); goto bad; } sounlock(so); return 0; bad: smb_nbst_disconnect(nbp->nbp_vc, l); return error; } static int nbssn_rq_request(struct nbpcb *nbp, struct lwp *l) { struct mbchain mb, *mbp = &mb; struct mdchain md, *mdp = &md; struct mbuf *m0; struct sockaddr_in sin; u_short port; u_int8_t rpcode; int error, rplen; error = mb_init(mbp); if (error) return error; mb_put_uint32le(mbp, 0); (void) nb_put_name(mbp, nbp->nbp_paddr); (void) nb_put_name(mbp, nbp->nbp_laddr); nb_sethdr(mbp->mb_top, NB_SSN_REQUEST, mb_fixhdr(mbp) - 4); error = nb_sosend(nbp->nbp_tso, mbp->mb_top, 0, l); if (!error) { nbp->nbp_state = NBST_RQSENT; } mb_detach(mbp); mb_done(mbp); if (error) return error; error = nbssn_recv(nbp, &m0, &rplen, &rpcode, true, l); if (error) { if (error == EWOULDBLOCK) { /* Timeout */ NBDEBUG(("initial request timeout\n")); return ETIMEDOUT; } NBDEBUG(("recv() error %d\n", error)); return error; } /* * Process NETBIOS reply */ if (m0) md_initm(mdp, m0); error = 0; do { if (rpcode == NB_SSN_POSRESP) { nbp->nbp_state = NBST_SESSION; nbp->nbp_flags |= NBF_CONNECTED; break; } if (rpcode != NB_SSN_RTGRESP) { error = ECONNABORTED; break; } if (rplen != 6) { error = ECONNABORTED; break; } md_get_mem(mdp, (void *)&sin.sin_addr, 4, MB_MSYSTEM); md_get_uint16(mdp, &port); sin.sin_port = port; nbp->nbp_state = NBST_RETARGET; smb_nbst_disconnect(nbp->nbp_vc, l); error = nb_connect_in(nbp, &sin, l); if (!error) error = nbssn_rq_request(nbp, l); if (error) { smb_nbst_disconnect(nbp->nbp_vc, l); break; } } while(0); if (m0) md_done(mdp); return error; } static int nbssn_recvhdr(struct nbpcb *nbp, int *lenp, u_int8_t *rpcodep, int flags, struct lwp *l) { struct socket *so = nbp->nbp_tso; struct uio auio; struct iovec aio; u_int32_t len; int error; aio.iov_base = (void *)&len; aio.iov_len = sizeof(len); auio.uio_iov = &aio; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_offset = 0; auio.uio_resid = sizeof(len); UIO_SETUP_SYSSPACE(&auio); error = (*so->so_receive)(so, NULL, &auio, NULL, NULL, &flags); if (error) return error; if (auio.uio_resid > 0) { SMBSDEBUG(("short reply\n")); return EPIPE; } len = ntohl(len); *rpcodep = (len >> 24) & 0xFF; len &= 0x1ffff; if (len > SMB_MAXPKTLEN) { SMBERROR(("packet too long (%d)\n", len)); return EFBIG; } *lenp = len; return 0; } static int nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp, u_int8_t *rpcodep, bool dowait, struct lwp *l) { struct socket *so = nbp->nbp_tso; struct uio auio; struct mbuf *m, *tm, *im; u_int8_t rpcode; int len, resid; int error, rcvflg; len = 0; /* XXX gcc */ rpcode = 0; /* XXX gcc */ if (so == NULL) return ENOTCONN; if (mpp) *mpp = NULL; m = NULL; for(;; dowait = false) { /* * Poll for a response header. * If we don't have one waiting, return. */ error = nbssn_recvhdr(nbp, &len, &rpcode, dowait ? 0 : MSG_DONTWAIT, l); if (so->so_state & (SS_ISDISCONNECTING | SS_ISDISCONNECTED | SS_CANTRCVMORE)) { nbp->nbp_state = NBST_CLOSED; NBDEBUG(("session closed by peer\n")); return ECONNRESET; } if (error) return error; if (len == 0 && nbp->nbp_state != NBST_SESSION) break; /* no data, try again */ if (rpcode == NB_SSN_KEEPALIVE) continue; /* * Loop, blocking, for data following the response header. * * Note that we can't simply block here with MSG_WAITALL for the * entire response size, as it may be larger than the TCP * slow-start window that the sender employs. This will result * in the sender stalling until the delayed ACK is sent, then * resuming slow-start, resulting in very poor performance. * * Instead, we never request more than NB_SORECEIVE_CHUNK * bytes at a time, resulting in an ack being pushed by * the TCP code at the completion of each call. */ resid = len; while (resid > 0) { tm = NULL; rcvflg = MSG_WAITALL; memset(&auio, 0, sizeof(auio)); auio.uio_resid = min(resid, NB_SORECEIVE_CHUNK); /* not need to setup uio_vmspace */ resid -= auio.uio_resid; /* * Spin until we have collected everything in * this chunk. */ do { rcvflg = MSG_WAITALL; error = (*so->so_receive)(so, NULL, &auio, &tm, NULL, &rcvflg); } while (error == EWOULDBLOCK || error == EINTR || error == ERESTART); if (error) goto out; /* short return guarantees unhappiness */ if (auio.uio_resid > 0) { SMBERROR(("packet is shorter than expected\n")); error = EPIPE; goto out; } /* append received chunk to previous chunk(s) */ if (m == NULL) { m = tm; } else { /* * Just glue the new chain on the end. * Consumer will pullup as required. */ for (im = m; im->m_next != NULL; im = im->m_next) ; im->m_next = tm; } } /* got a session/message packet? */ if (nbp->nbp_state == NBST_SESSION && rpcode == NB_SSN_MESSAGE) break; /* drop packet and try for another */ NBDEBUG(("non-session packet %x\n", rpcode)); if (m) { m_freem(m); m = NULL; } } out: if (error) { if (m) m_freem(m); return error; } if (mpp) *mpp = m; else m_freem(m); *lenp = len; *rpcodep = rpcode; return 0; } /* * SMB transport interface */ static int smb_nbst_create(struct smb_vc *vcp, struct lwp *l) { struct nbpcb *nbp; nbp = kmem_zalloc(sizeof(*nbp), KM_SLEEP); nbp->nbp_state = NBST_CLOSED; nbp->nbp_vc = vcp; vcp->vc_tdata = nbp; return 0; } static int smb_nbst_done(struct smb_vc *vcp, struct lwp *l) { struct nbpcb *nbp = vcp->vc_tdata; if (nbp == NULL) return ENOTCONN; smb_nbst_disconnect(vcp, l); if (nbp->nbp_laddr) free(nbp->nbp_laddr, M_SONAME); if (nbp->nbp_paddr) free(nbp->nbp_paddr, M_SONAME); kmem_free(nbp, sizeof(*nbp)); return 0; } static int smb_nbst_bind(struct smb_vc *vcp, struct sockaddr *sap, struct lwp *l) { struct nbpcb *nbp = vcp->vc_tdata; struct sockaddr_nb *snb; int error, slen; NBDEBUG(("\n")); error = EINVAL; do { if (nbp->nbp_flags & NBF_LOCADDR) break; /* * It is possible to create NETBIOS name in the kernel, * but nothing prevents us to do it in the user space. */ if (sap == NULL) break; slen = sap->sa_len; if (slen < NB_MINSALEN) break; snb = (struct sockaddr_nb*)dup_sockaddr(sap, 1); if (snb == NULL) { error = ENOMEM; break; } nbp->nbp_laddr = snb; nbp->nbp_flags |= NBF_LOCADDR; error = 0; } while(0); return error; } static int smb_nbst_connect(struct smb_vc *vcp, struct sockaddr *sap, struct lwp *l) { struct nbpcb *nbp = vcp->vc_tdata; struct sockaddr_in sin; struct sockaddr_nb *snb; int error, slen; NBDEBUG(("\n")); if (nbp->nbp_tso != NULL) return EISCONN; if (nbp->nbp_laddr == NULL) return EINVAL; slen = sap->sa_len; if (slen < NB_MINSALEN) return EINVAL; if (nbp->nbp_paddr) { free(nbp->nbp_paddr, M_SONAME); nbp->nbp_paddr = NULL; } snb = (struct sockaddr_nb*)dup_sockaddr(sap, 1); if (snb == NULL) return ENOMEM; nbp->nbp_paddr = snb; sin = snb->snb_addrin; error = nb_connect_in(nbp, &sin, l); if (error) return error; error = nbssn_rq_request(nbp, l); if (error) smb_nbst_disconnect(vcp, l); return error; } static int smb_nbst_disconnect(struct smb_vc *vcp, struct lwp *l) { struct nbpcb *nbp = vcp->vc_tdata; struct socket *so; if (nbp == NULL || nbp->nbp_tso == NULL) return ENOTCONN; if ((so = nbp->nbp_tso) != NULL) { nbp->nbp_flags &= ~NBF_CONNECTED; nbp->nbp_tso = NULL; solock(so); soshutdown(so, 2); sounlock(so); soclose(so); } if (nbp->nbp_state != NBST_RETARGET) { nbp->nbp_state = NBST_CLOSED; } return 0; } static int smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct lwp *l) { struct nbpcb *nbp = vcp->vc_tdata; int error; if (nbp->nbp_state != NBST_SESSION) { error = ENOTCONN; goto abort; } M_PREPEND(m0, 4, M_WAITOK); if (m0 == NULL) return ENOBUFS; nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4); error = nb_sosend(nbp->nbp_tso, m0, 0, l); return error; abort: if (m0) m_freem(m0); return error; } static int smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct lwp *l) { struct nbpcb *nbp = vcp->vc_tdata; u_int8_t rpcode; int error, rplen; nbp->nbp_flags |= NBF_RECVLOCK; error = nbssn_recv(nbp, mpp, &rplen, &rpcode, false, l); nbp->nbp_flags &= ~NBF_RECVLOCK; return error; } static void smb_nbst_timo(struct smb_vc *vcp) { /* Nothing */ } static void smb_nbst_intr(struct smb_vc *vcp) { struct nbpcb *nbp = vcp->vc_tdata; struct socket *so; if (nbp == NULL || (so = nbp->nbp_tso) == NULL) return; solock(so); sorwakeup(so); sowwakeup(so); sounlock(so); } static int smb_nbst_getparam(struct smb_vc *vcp, int param, void *data) { struct timeval *tvp; switch (param) { case SMBTP_SNDSZ: *(int*)data = nb_tcpsndbuf; break; case SMBTP_RCVSZ: *(int*)data = nb_tcprcvbuf; break; case SMBTP_TIMEOUT: tvp = (struct timeval *)data; tvp->tv_sec = NB_RCVTIMEO; tvp->tv_usec = 0; break; default: return EINVAL; } return 0; } static int smb_nbst_setparam(struct smb_vc *vcp, int param, void *data) { struct nbpcb *nbp = vcp->vc_tdata; switch (param) { case SMBTP_SELECTID: nbp->nbp_selectid = data; break; default: return EINVAL; } return 0; } /* * Check for fatal errors */ static int smb_nbst_fatal(struct smb_vc *vcp, int error) { switch (error) { case ENOTCONN: case ENETRESET: case ECONNABORTED: return 1; } return 0; } struct smb_tran_desc smb_tran_nbtcp_desc = { SMBT_NBTCP, smb_nbst_create, smb_nbst_done, smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect, smb_nbst_send, smb_nbst_recv, smb_nbst_timo, smb_nbst_intr, smb_nbst_getparam, smb_nbst_setparam, smb_nbst_fatal, { NULL, NULL }, };