/* $OpenBSD: uipc_socket.c,v 1.100 2012/04/24 16:35:08 deraadt Exp $ */ /* $NetBSD: uipc_socket.c,v 1.21 1996/02/04 02:17:52 christos Exp $ */ /* * Copyright (c) 1982, 1986, 1988, 1990, 1993 * The Regents of the University of California. 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. 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_socket.c 8.3 (Berkeley) 4/15/94 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include void sbsync(struct sockbuf *, struct mbuf *); int sosplice(struct socket *, int, off_t, struct timeval *); void sounsplice(struct socket *, struct socket *, int); int somove(struct socket *, int); void soidle(void *); void filt_sordetach(struct knote *kn); int filt_soread(struct knote *kn, long hint); void filt_sowdetach(struct knote *kn); int filt_sowrite(struct knote *kn, long hint); int filt_solisten(struct knote *kn, long hint); struct filterops solisten_filtops = { 1, NULL, filt_sordetach, filt_solisten }; struct filterops soread_filtops = { 1, NULL, filt_sordetach, filt_soread }; struct filterops sowrite_filtops = { 1, NULL, filt_sowdetach, filt_sowrite }; #ifndef SOMINCONN #define SOMINCONN 80 #endif /* SOMINCONN */ int somaxconn = SOMAXCONN; int sominconn = SOMINCONN; struct pool socket_pool; void soinit(void) { pool_init(&socket_pool, sizeof(struct socket), 0, 0, 0, "sockpl", NULL); } /* * Socket operation routines. * These routines are called by the routines in * sys_socket.c or from a system process, and * implement the semantics of socket operations by * switching out to the protocol specific routines. */ /*ARGSUSED*/ int socreate(int dom, struct socket **aso, int type, int proto) { struct proc *p = curproc; /* XXX */ struct protosw *prp; struct socket *so; int error, s; if (proto) prp = pffindproto(dom, proto, type); else prp = pffindtype(dom, type); if (prp == NULL || prp->pr_usrreq == 0) return (EPROTONOSUPPORT); if (prp->pr_type != type) return (EPROTOTYPE); s = splsoftnet(); so = pool_get(&socket_pool, PR_WAITOK | PR_ZERO); TAILQ_INIT(&so->so_q0); TAILQ_INIT(&so->so_q); so->so_type = type; if (suser(p, 0) == 0) so->so_state = SS_PRIV; so->so_ruid = p->p_cred->p_ruid; so->so_euid = p->p_ucred->cr_uid; so->so_rgid = p->p_cred->p_rgid; so->so_egid = p->p_ucred->cr_gid; so->so_cpid = p->p_pid; so->so_proto = prp; error = (*prp->pr_usrreq)(so, PRU_ATTACH, NULL, (struct mbuf *)(long)proto, NULL, p); if (error) { so->so_state |= SS_NOFDREF; sofree(so); splx(s); return (error); } splx(s); *aso = so; return (0); } int sobind(struct socket *so, struct mbuf *nam, struct proc *p) { int s = splsoftnet(); int error; error = (*so->so_proto->pr_usrreq)(so, PRU_BIND, NULL, nam, NULL, p); splx(s); return (error); } int solisten(struct socket *so, int backlog) { int s, error; #ifdef SOCKET_SPLICE if (so->so_splice || so->so_spliceback) return (EOPNOTSUPP); #endif /* SOCKET_SPLICE */ s = splsoftnet(); error = (*so->so_proto->pr_usrreq)(so, PRU_LISTEN, NULL, NULL, NULL, curproc); if (error) { splx(s); return (error); } if (TAILQ_FIRST(&so->so_q) == NULL) so->so_options |= SO_ACCEPTCONN; if (backlog < 0 || backlog > somaxconn) backlog = somaxconn; if (backlog < sominconn) backlog = sominconn; so->so_qlimit = backlog; splx(s); return (0); } /* * Must be called at splsoftnet() */ void sofree(struct socket *so) { splsoftassert(IPL_SOFTNET); if (so->so_pcb || (so->so_state & SS_NOFDREF) == 0) return; if (so->so_head) { /* * We must not decommission a socket that's on the accept(2) * queue. If we do, then accept(2) may hang after select(2) * indicated that the listening socket was ready. */ if (!soqremque(so, 0)) return; } #ifdef SOCKET_SPLICE if (so->so_spliceback) sounsplice(so->so_spliceback, so, so->so_spliceback != so); if (so->so_splice) sounsplice(so, so->so_splice, 0); #endif /* SOCKET_SPLICE */ sbrelease(&so->so_snd); sorflush(so); pool_put(&socket_pool, so); } /* * Close a socket on last file table reference removal. * Initiate disconnect if connected. * Free socket when disconnect complete. */ int soclose(struct socket *so) { struct socket *so2; int s = splsoftnet(); /* conservative */ int error = 0; if (so->so_options & SO_ACCEPTCONN) { while ((so2 = TAILQ_FIRST(&so->so_q0)) != NULL) { (void) soqremque(so2, 0); (void) soabort(so2); } while ((so2 = TAILQ_FIRST(&so->so_q)) != NULL) { (void) soqremque(so2, 1); (void) soabort(so2); } } if (so->so_pcb == 0) goto discard; if (so->so_state & SS_ISCONNECTED) { if ((so->so_state & SS_ISDISCONNECTING) == 0) { error = sodisconnect(so); if (error) goto drop; } if (so->so_options & SO_LINGER) { if ((so->so_state & SS_ISDISCONNECTING) && (so->so_state & SS_NBIO)) goto drop; while (so->so_state & SS_ISCONNECTED) { error = tsleep(&so->so_timeo, PSOCK | PCATCH, "netcls", so->so_linger * hz); if (error) break; } } } drop: if (so->so_pcb) { int error2 = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, NULL, NULL, NULL, curproc); if (error == 0) error = error2; } discard: if (so->so_state & SS_NOFDREF) panic("soclose: NOFDREF"); so->so_state |= SS_NOFDREF; sofree(so); splx(s); return (error); } /* * Must be called at splsoftnet. */ int soabort(struct socket *so) { splsoftassert(IPL_SOFTNET); return (*so->so_proto->pr_usrreq)(so, PRU_ABORT, NULL, NULL, NULL, curproc); } int soaccept(struct socket *so, struct mbuf *nam) { int s = splsoftnet(); int error = 0; if ((so->so_state & SS_NOFDREF) == 0) panic("soaccept: !NOFDREF"); so->so_state &= ~SS_NOFDREF; if ((so->so_state & SS_ISDISCONNECTED) == 0 || (so->so_proto->pr_flags & PR_ABRTACPTDIS) == 0) error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, NULL, nam, NULL, curproc); else error = ECONNABORTED; splx(s); return (error); } int soconnect(struct socket *so, struct mbuf *nam) { int s; int error; if (so->so_options & SO_ACCEPTCONN) return (EOPNOTSUPP); s = splsoftnet(); /* * If protocol is connection-based, can only connect once. * Otherwise, if connected, try to disconnect first. * This allows user to disconnect by connecting to, e.g., * a null address. */ if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING) && ((so->so_proto->pr_flags & PR_CONNREQUIRED) || (error = sodisconnect(so)))) error = EISCONN; else error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, NULL, nam, NULL, curproc); splx(s); return (error); } int soconnect2(struct socket *so1, struct socket *so2) { int s = splsoftnet(); int error; error = (*so1->so_proto->pr_usrreq)(so1, PRU_CONNECT2, NULL, (struct mbuf *)so2, NULL, curproc); splx(s); return (error); } int sodisconnect(struct socket *so) { int s = splsoftnet(); int error; if ((so->so_state & SS_ISCONNECTED) == 0) { error = ENOTCONN; goto bad; } if (so->so_state & SS_ISDISCONNECTING) { error = EALREADY; goto bad; } error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, NULL, NULL, NULL, curproc); bad: splx(s); return (error); } #define SBLOCKWAIT(f) (((f) & MSG_DONTWAIT) ? M_NOWAIT : M_WAITOK) /* * Send on a socket. * If send must go all at once and message is larger than * send buffering, then hard error. * Lock against other senders. * If must go all at once and not enough room now, then * inform user that this would block and do nothing. * Otherwise, if nonblocking, send as much as possible. * The data to be sent is described by "uio" if nonzero, * otherwise by the mbuf chain "top" (which must be null * if uio is not). Data provided in mbuf chain must be small * enough to send all at once. * * Returns nonzero on error, timeout or signal; callers * must check for short counts if EINTR/ERESTART are returned. * Data and control buffers are freed on return. */ int sosend(struct socket *so, struct mbuf *addr, struct uio *uio, struct mbuf *top, struct mbuf *control, int flags) { struct mbuf **mp; struct mbuf *m; long space, len, mlen, clen = 0; quad_t resid; int error, s, dontroute; int atomic = sosendallatonce(so) || top; if (uio) resid = uio->uio_resid; else resid = top->m_pkthdr.len; /* * In theory resid should be unsigned (since uio->uio_resid is). * However, space must be signed, as it might be less than 0 * if we over-committed, and we must use a signed comparison * of space and resid. On the other hand, a negative resid * causes us to loop sending 0-length segments to the protocol. * MSG_EOR on a SOCK_STREAM socket is also invalid. */ if (resid < 0 || (so->so_type == SOCK_STREAM && (flags & MSG_EOR))) { error = EINVAL; goto out; } dontroute = (flags & MSG_DONTROUTE) && (so->so_options & SO_DONTROUTE) == 0 && (so->so_proto->pr_flags & PR_ATOMIC); if (uio && uio->uio_procp) uio->uio_procp->p_ru.ru_msgsnd++; if (control) { clen = control->m_len; /* reserve extra space for AF_LOCAL's internalize */ if (so->so_proto->pr_domain->dom_family == AF_LOCAL && clen >= CMSG_ALIGN(sizeof(struct cmsghdr)) && mtod(control, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) clen = CMSG_SPACE( (clen - CMSG_ALIGN(sizeof(struct cmsghdr))) * (sizeof(struct file *) / sizeof(int))); } #define snderr(errno) { error = errno; splx(s); goto release; } restart: if ((error = sblock(&so->so_snd, SBLOCKWAIT(flags))) != 0) goto out; so->so_state |= SS_ISSENDING; do { s = splsoftnet(); if (so->so_state & SS_CANTSENDMORE) snderr(EPIPE); if (so->so_error) { error = so->so_error; so->so_error = 0; splx(s); goto release; } if ((so->so_state & SS_ISCONNECTED) == 0) { if (so->so_proto->pr_flags & PR_CONNREQUIRED) { if ((so->so_state & SS_ISCONFIRMING) == 0 && !(resid == 0 && clen != 0)) snderr(ENOTCONN); } else if (addr == 0) snderr(EDESTADDRREQ); } space = sbspace(&so->so_snd); if (flags & MSG_OOB) space += 1024; if ((atomic && resid > so->so_snd.sb_hiwat) || (so->so_proto->pr_domain->dom_family != AF_LOCAL && clen > so->so_snd.sb_hiwat)) snderr(EMSGSIZE); if (space < resid + clen && (atomic || space < so->so_snd.sb_lowat || space < clen)) { if (so->so_state & SS_NBIO) snderr(EWOULDBLOCK); sbunlock(&so->so_snd); error = sbwait(&so->so_snd); so->so_state &= ~SS_ISSENDING; splx(s); if (error) goto out; goto restart; } splx(s); mp = ⊤ space -= clen; do { if (uio == NULL) { /* * Data is prepackaged in "top". */ resid = 0; if (flags & MSG_EOR) top->m_flags |= M_EOR; } else do { if (top == 0) { MGETHDR(m, M_WAIT, MT_DATA); mlen = MHLEN; m->m_pkthdr.len = 0; m->m_pkthdr.rcvif = (struct ifnet *)0; } else { MGET(m, M_WAIT, MT_DATA); mlen = MLEN; } if (resid >= MINCLSIZE && space >= MCLBYTES) { MCLGET(m, M_NOWAIT); if ((m->m_flags & M_EXT) == 0) goto nopages; mlen = MCLBYTES; if (atomic && top == 0) { len = lmin(MCLBYTES - max_hdr, resid); m->m_data += max_hdr; } else len = lmin(MCLBYTES, resid); space -= len; } else { nopages: len = lmin(lmin(mlen, resid), space); space -= len; /* * For datagram protocols, leave room * for protocol headers in first mbuf. */ if (atomic && top == 0 && len < mlen) MH_ALIGN(m, len); } error = uiomove(mtod(m, caddr_t), (int)len, uio); resid = uio->uio_resid; m->m_len = len; *mp = m; top->m_pkthdr.len += len; if (error) goto release; mp = &m->m_next; if (resid <= 0) { if (flags & MSG_EOR) top->m_flags |= M_EOR; break; } } while (space > 0 && atomic); if (dontroute) so->so_options |= SO_DONTROUTE; s = splsoftnet(); /* XXX */ if (resid <= 0) so->so_state &= ~SS_ISSENDING; error = (*so->so_proto->pr_usrreq)(so, (flags & MSG_OOB) ? PRU_SENDOOB : PRU_SEND, top, addr, control, curproc); splx(s); if (dontroute) so->so_options &= ~SO_DONTROUTE; clen = 0; control = 0; top = 0; mp = ⊤ if (error) goto release; } while (resid && space > 0); } while (resid); release: so->so_state &= ~SS_ISSENDING; sbunlock(&so->so_snd); out: if (top) m_freem(top); if (control) m_freem(control); return (error); } /* * Following replacement or removal of the first mbuf on the first * mbuf chain of a socket buffer, push necessary state changes back * into the socket buffer so that other consumers see the values * consistently. 'nextrecord' is the callers locally stored value of * the original value of sb->sb_mb->m_nextpkt which must be restored * when the lead mbuf changes. NOTE: 'nextrecord' may be NULL. */ void sbsync(struct sockbuf *sb, struct mbuf *nextrecord) { /* * First, update for the new value of nextrecord. If necessary, * make it the first record. */ if (sb->sb_mb != NULL) sb->sb_mb->m_nextpkt = nextrecord; else sb->sb_mb = nextrecord; /* * Now update any dependent socket buffer fields to reflect * the new state. This is an inline of SB_EMPTY_FIXUP, with * the addition of a second clause that takes care of the * case where sb_mb has been updated, but remains the last * record. */ if (sb->sb_mb == NULL) { sb->sb_mbtail = NULL; sb->sb_lastrecord = NULL; } else if (sb->sb_mb->m_nextpkt == NULL) sb->sb_lastrecord = sb->sb_mb; } /* * Implement receive operations on a socket. * We depend on the way that records are added to the sockbuf * by sbappend*. In particular, each record (mbufs linked through m_next) * must begin with an address if the protocol so specifies, * followed by an optional mbuf or mbufs containing ancillary data, * and then zero or more mbufs of data. * In order to avoid blocking network interrupts for the entire time here, * we splx() while doing the actual copy to user space. * Although the sockbuf is locked, new data may still be appended, * and thus we must maintain consistency of the sockbuf during that time. * * The caller may receive the data as a single mbuf chain by supplying * an mbuf **mp0 for use in returning the chain. The uio is then used * only for the count in uio_resid. */ int soreceive(struct socket *so, struct mbuf **paddr, struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp, socklen_t controllen) { struct mbuf *m, **mp; struct mbuf *cm; int flags, len, error, s, offset; struct protosw *pr = so->so_proto; struct mbuf *nextrecord; int moff, type = 0; size_t orig_resid = uio->uio_resid; int uio_error = 0; int resid; mp = mp0; if (paddr) *paddr = 0; if (controlp) *controlp = 0; if (flagsp) flags = *flagsp &~ MSG_EOR; else flags = 0; if (so->so_state & SS_NBIO) flags |= MSG_DONTWAIT; if (flags & MSG_OOB) { m = m_get(M_WAIT, MT_DATA); error = (*pr->pr_usrreq)(so, PRU_RCVOOB, m, (struct mbuf *)(long)(flags & MSG_PEEK), NULL, curproc); if (error) goto bad; do { error = uiomove(mtod(m, caddr_t), (int) min(uio->uio_resid, m->m_len), uio); m = m_free(m); } while (uio->uio_resid && error == 0 && m); bad: if (m) m_freem(m); return (error); } if (mp) *mp = NULL; if (so->so_state & SS_ISCONFIRMING && uio->uio_resid) (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, curproc); restart: if ((error = sblock(&so->so_rcv, SBLOCKWAIT(flags))) != 0) return (error); s = splsoftnet(); m = so->so_rcv.sb_mb; #ifdef SOCKET_SPLICE if (so->so_splice) m = NULL; #endif /* SOCKET_SPLICE */ /* * If we have less data than requested, block awaiting more * (subject to any timeout) if: * 1. the current count is less than the low water mark, * 2. MSG_WAITALL is set, and it is possible to do the entire * receive operation at once if we block (resid <= hiwat), or * 3. MSG_DONTWAIT is not set. * If MSG_WAITALL is set but resid is larger than the receive buffer, * we have to do the receive in sections, and thus risk returning * a short count if a timeout or signal occurs after we start. */ if (m == NULL || (((flags & MSG_DONTWAIT) == 0 && so->so_rcv.sb_cc < uio->uio_resid) && (so->so_rcv.sb_cc < so->so_rcv.sb_lowat || ((flags & MSG_WAITALL) && uio->uio_resid <= so->so_rcv.sb_hiwat)) && m->m_nextpkt == NULL && (pr->pr_flags & PR_ATOMIC) == 0)) { #ifdef DIAGNOSTIC if (m == NULL && so->so_rcv.sb_cc) #ifdef SOCKET_SPLICE if (so->so_splice == NULL) #endif /* SOCKET_SPLICE */ panic("receive 1"); #endif if (so->so_error) { if (m) goto dontblock; error = so->so_error; if ((flags & MSG_PEEK) == 0) so->so_error = 0; goto release; } if (so->so_state & SS_CANTRCVMORE) { if (m) goto dontblock; else if (so->so_rcv.sb_cc == 0) goto release; } for (; m; m = m->m_next) if (m->m_type == MT_OOBDATA || (m->m_flags & M_EOR)) { m = so->so_rcv.sb_mb; goto dontblock; } if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 && (so->so_proto->pr_flags & PR_CONNREQUIRED)) { error = ENOTCONN; goto release; } if (uio->uio_resid == 0 && controlp == NULL) goto release; if ((so->so_state & SS_NBIO) || (flags & MSG_DONTWAIT)) { error = EWOULDBLOCK; goto release; } SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 1"); SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 1"); sbunlock(&so->so_rcv); error = sbwait(&so->so_rcv); splx(s); if (error) return (error); goto restart; } dontblock: /* * On entry here, m points to the first record of the socket buffer. * From this point onward, we maintain 'nextrecord' as a cache of the * pointer to the next record in the socket buffer. We must keep the * various socket buffer pointers and local stack versions of the * pointers in sync, pushing out modifications before operations that * may sleep, and re-reading them afterwards. * * Otherwise, we will race with the network stack appending new data * or records onto the socket buffer by using inconsistent/stale * versions of the field, possibly resulting in socket buffer * corruption. */ if (uio->uio_procp) uio->uio_procp->p_ru.ru_msgrcv++; KASSERT(m == so->so_rcv.sb_mb); SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); nextrecord = m->m_nextpkt; if (pr->pr_flags & PR_ADDR) { #ifdef DIAGNOSTIC if (m->m_type != MT_SONAME) panic("receive 1a"); #endif orig_resid = 0; if (flags & MSG_PEEK) { if (paddr) *paddr = m_copy(m, 0, m->m_len); m = m->m_next; } else { sbfree(&so->so_rcv, m); if (paddr) { *paddr = m; so->so_rcv.sb_mb = m->m_next; m->m_next = 0; m = so->so_rcv.sb_mb; } else { MFREE(m, so->so_rcv.sb_mb); m = so->so_rcv.sb_mb; } sbsync(&so->so_rcv, nextrecord); } } while (m && m->m_type == MT_CONTROL && error == 0) { if (flags & MSG_PEEK) { if (controlp) *controlp = m_copy(m, 0, m->m_len); m = m->m_next; } else { sbfree(&so->so_rcv, m); so->so_rcv.sb_mb = m->m_next; m->m_next = 0; cm = m; m = so->so_rcv.sb_mb; sbsync(&so->so_rcv, nextrecord); if (controlp) { if (pr->pr_domain->dom_externalize && mtod(cm, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) error = (*pr->pr_domain->dom_externalize)(cm, controllen); *controlp = cm; } else { /* * Dispose of any SCM_RIGHTS message that went * through the read path rather than recv. */ if (pr->pr_domain->dom_dispose && mtod(cm, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) pr->pr_domain->dom_dispose(cm); m_free(cm); } } if (m != NULL) nextrecord = so->so_rcv.sb_mb->m_nextpkt; else nextrecord = so->so_rcv.sb_mb; if (controlp) { orig_resid = 0; controlp = &(*controlp)->m_next; } } /* If m is non-NULL, we have some data to read. */ if (m) { type = m->m_type; if (type == MT_OOBDATA) flags |= MSG_OOB; if (m->m_flags & M_BCAST) flags |= MSG_BCAST; if (m->m_flags & M_MCAST) flags |= MSG_MCAST; } SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); moff = 0; offset = 0; while (m && uio->uio_resid > 0 && error == 0) { if (m->m_type == MT_OOBDATA) { if (type != MT_OOBDATA) break; } else if (type == MT_OOBDATA) break; #ifdef DIAGNOSTIC else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) panic("receive 3"); #endif so->so_state &= ~SS_RCVATMARK; len = uio->uio_resid; if (so->so_oobmark && len > so->so_oobmark - offset) len = so->so_oobmark - offset; if (len > m->m_len - moff) len = m->m_len - moff; /* * If mp is set, just pass back the mbufs. * Otherwise copy them out via the uio, then free. * Sockbuf must be consistent here (points to current mbuf, * it points to next record) when we drop priority; * we must note any additions to the sockbuf when we * block interrupts again. */ if (mp == NULL && uio_error == 0) { SBLASTRECORDCHK(&so->so_rcv, "soreceive uiomove"); SBLASTMBUFCHK(&so->so_rcv, "soreceive uiomove"); resid = uio->uio_resid; splx(s); uio_error = uiomove(mtod(m, caddr_t) + moff, (int)len, uio); s = splsoftnet(); if (uio_error) uio->uio_resid = resid - len; } else uio->uio_resid -= len; if (len == m->m_len - moff) { if (m->m_flags & M_EOR) flags |= MSG_EOR; if (flags & MSG_PEEK) { m = m->m_next; moff = 0; } else { nextrecord = m->m_nextpkt; sbfree(&so->so_rcv, m); if (mp) { *mp = m; mp = &m->m_next; so->so_rcv.sb_mb = m = m->m_next; *mp = NULL; } else { MFREE(m, so->so_rcv.sb_mb); m = so->so_rcv.sb_mb; } /* * If m != NULL, we also know that * so->so_rcv.sb_mb != NULL. */ KASSERT(so->so_rcv.sb_mb == m); if (m) { m->m_nextpkt = nextrecord; if (nextrecord == NULL) so->so_rcv.sb_lastrecord = m; } else { so->so_rcv.sb_mb = nextrecord; SB_EMPTY_FIXUP(&so->so_rcv); } SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); } } else { if (flags & MSG_PEEK) moff += len; else { if (mp) *mp = m_copym(m, 0, len, M_WAIT); m->m_data += len; m->m_len -= len; so->so_rcv.sb_cc -= len; so->so_rcv.sb_datacc -= len; } } if (so->so_oobmark) { if ((flags & MSG_PEEK) == 0) { so->so_oobmark -= len; if (so->so_oobmark == 0) { so->so_state |= SS_RCVATMARK; break; } } else { offset += len; if (offset == so->so_oobmark) break; } } if (flags & MSG_EOR) break; /* * If the MSG_WAITALL flag is set (for non-atomic socket), * we must not quit until "uio->uio_resid == 0" or an error * termination. If a signal/timeout occurs, return * with a short count but without error. * Keep sockbuf locked against other readers. */ while (flags & MSG_WAITALL && m == NULL && uio->uio_resid > 0 && !sosendallatonce(so) && !nextrecord) { if (so->so_error || so->so_state & SS_CANTRCVMORE) break; SBLASTRECORDCHK(&so->so_rcv, "soreceive sbwait 2"); SBLASTMBUFCHK(&so->so_rcv, "soreceive sbwait 2"); error = sbwait(&so->so_rcv); if (error) { sbunlock(&so->so_rcv); splx(s); return (0); } if ((m = so->so_rcv.sb_mb) != NULL) nextrecord = m->m_nextpkt; } } if (m && pr->pr_flags & PR_ATOMIC) { flags |= MSG_TRUNC; if ((flags & MSG_PEEK) == 0) (void) sbdroprecord(&so->so_rcv); } if ((flags & MSG_PEEK) == 0) { if (m == NULL) { /* * First part is an inline SB_EMPTY_FIXUP(). Second * part makes sure sb_lastrecord is up-to-date if * there is still data in the socket buffer. */ so->so_rcv.sb_mb = nextrecord; if (so->so_rcv.sb_mb == NULL) { so->so_rcv.sb_mbtail = NULL; so->so_rcv.sb_lastrecord = NULL; } else if (nextrecord->m_nextpkt == NULL) so->so_rcv.sb_lastrecord = nextrecord; } SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) (*pr->pr_usrreq)(so, PRU_RCVD, NULL, (struct mbuf *)(long)flags, NULL, curproc); } if (orig_resid == uio->uio_resid && orig_resid && (flags & MSG_EOR) == 0 && (so->so_state & SS_CANTRCVMORE) == 0) { sbunlock(&so->so_rcv); splx(s); goto restart; } if (uio_error) error = uio_error; if (flagsp) *flagsp |= flags; release: sbunlock(&so->so_rcv); splx(s); return (error); } int soshutdown(struct socket *so, int how) { struct protosw *pr = so->so_proto; switch (how) { case SHUT_RD: case SHUT_RDWR: sorflush(so); if (how == SHUT_RD) return (0); /* FALLTHROUGH */ case SHUT_WR: return (*pr->pr_usrreq)(so, PRU_SHUTDOWN, NULL, NULL, NULL, curproc); default: return (EINVAL); } } void sorflush(struct socket *so) { struct sockbuf *sb = &so->so_rcv; struct protosw *pr = so->so_proto; int s; struct sockbuf asb; sb->sb_flags |= SB_NOINTR; (void) sblock(sb, M_WAITOK); s = splnet(); socantrcvmore(so); sbunlock(sb); asb = *sb; bzero(sb, sizeof (*sb)); /* XXX - the bzero stumps all over so_rcv */ if (asb.sb_flags & SB_KNOTE) { sb->sb_sel.si_note = asb.sb_sel.si_note; sb->sb_flags = SB_KNOTE; } splx(s); if (pr->pr_flags & PR_RIGHTS && pr->pr_domain->dom_dispose) (*pr->pr_domain->dom_dispose)(asb.sb_mb); sbrelease(&asb); } #ifdef SOCKET_SPLICE int sosplice(struct socket *so, int fd, off_t max, struct timeval *tv) { struct file *fp; struct socket *sosp; int s, error = 0; if ((so->so_proto->pr_flags & PR_SPLICE) == 0) return (EPROTONOSUPPORT); if (so->so_options & SO_ACCEPTCONN) return (EOPNOTSUPP); if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0) return (ENOTCONN); /* If no fd is given, unsplice by removing existing link. */ if (fd < 0) { s = splsoftnet(); if (so->so_splice) sounsplice(so, so->so_splice, 1); splx(s); return (0); } if (max && max < 0) return (EINVAL); if (tv && (tv->tv_sec < 0 || tv->tv_usec < 0)) return (EINVAL); /* Find sosp, the drain socket where data will be spliced into. */ if ((error = getsock(curproc->p_fd, fd, &fp)) != 0) return (error); sosp = fp->f_data; /* Lock both receive and send buffer. */ if ((error = sblock(&so->so_rcv, (so->so_state & SS_NBIO) ? M_NOWAIT : M_WAITOK)) != 0) { FRELE(fp, curproc); return (error); } if ((error = sblock(&sosp->so_snd, M_WAITOK)) != 0) { sbunlock(&so->so_rcv); FRELE(fp, curproc); return (error); } s = splsoftnet(); if (so->so_splice || sosp->so_spliceback) { error = EBUSY; goto release; } if (sosp->so_proto->pr_usrreq != so->so_proto->pr_usrreq) { error = EPROTONOSUPPORT; goto release; } if (sosp->so_options & SO_ACCEPTCONN) { error = EOPNOTSUPP; goto release; } if ((sosp->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0) { error = ENOTCONN; goto release; } /* Splice so and sosp together. */ so->so_splice = sosp; sosp->so_spliceback = so; so->so_splicelen = 0; so->so_splicemax = max; if (tv) so->so_idletv = *tv; else timerclear(&so->so_idletv); timeout_set(&so->so_idleto, soidle, so); /* * To prevent softnet interrupt from calling somove() while * we sleep, the socket buffers are not marked as spliced yet. */ if (somove(so, M_WAIT)) { so->so_rcv.sb_flags |= SB_SPLICE; sosp->so_snd.sb_flags |= SB_SPLICE; } release: splx(s); sbunlock(&sosp->so_snd); sbunlock(&so->so_rcv); FRELE(fp, curproc); return (error); } void sounsplice(struct socket *so, struct socket *sosp, int wakeup) { splsoftassert(IPL_SOFTNET); timeout_del(&so->so_idleto); sosp->so_snd.sb_flags &= ~SB_SPLICE; so->so_rcv.sb_flags &= ~SB_SPLICE; so->so_splice = sosp->so_spliceback = NULL; if (wakeup && soreadable(so)) sorwakeup(so); } /* * Move data from receive buffer of spliced source socket to send * buffer of drain socket. Try to move as much as possible in one * big chunk. It is a TCP only implementation. * Return value 0 means splicing has been finished, 1 continue. */ int somove(struct socket *so, int wait) { struct socket *sosp = so->so_splice; struct mbuf *m = NULL, **mp; u_long len, off, oobmark; long space; int error = 0, maxreached = 0; short state; splsoftassert(IPL_SOFTNET); if (so->so_error) { error = so->so_error; goto release; } if (sosp->so_state & SS_CANTSENDMORE) { error = EPIPE; goto release; } if (sosp->so_error && sosp->so_error != ETIMEDOUT) { error = sosp->so_error; goto release; } if ((sosp->so_state & SS_ISCONNECTED) == 0) goto release; /* Calculate how many bytes can be copied now. */ len = so->so_rcv.sb_cc; if (len == 0) goto release; if (so->so_splicemax) { KASSERT(so->so_splicelen < so->so_splicemax); if (so->so_splicemax <= so->so_splicelen + len) { len = so->so_splicemax - so->so_splicelen; maxreached = 1; } } space = sbspace(&sosp->so_snd); if (so->so_oobmark && so->so_oobmark < len && so->so_oobmark < space + 1024) space += 1024; if (space <= 0) { maxreached = 0; goto release; } if (space < len) { maxreached = 0; if (space < sosp->so_snd.sb_lowat) goto release; len = space; } sosp->so_state |= SS_ISSENDING; /* Take at most len mbufs out of receive buffer. */ m = so->so_rcv.sb_mb; for (off = 0, mp = &m; off < len; off += (*mp)->m_len, mp = &(*mp)->m_next) { u_long size = len - off; if ((*mp)->m_len > size) { if (!maxreached || (*mp = m_copym( so->so_rcv.sb_mb, 0, size, wait)) == NULL) { len -= size; break; } so->so_rcv.sb_mb->m_data += size; so->so_rcv.sb_mb->m_len -= size; so->so_rcv.sb_cc -= size; so->so_rcv.sb_datacc -= size; } else { *mp = so->so_rcv.sb_mb; sbfree(&so->so_rcv, *mp); so->so_rcv.sb_mb = (*mp)->m_next; } } *mp = NULL; SB_EMPTY_FIXUP(&so->so_rcv); so->so_rcv.sb_lastrecord = so->so_rcv.sb_mb; SBLASTRECORDCHK(&so->so_rcv, "somove"); SBLASTMBUFCHK(&so->so_rcv, "somove"); KDASSERT(m->m_nextpkt == NULL); KASSERT(so->so_rcv.sb_mb == so->so_rcv.sb_lastrecord); #ifdef SOCKBUF_DEBUG sbcheck(&so->so_rcv); #endif /* Send window update to source peer if receive buffer has changed. */ if (m) (so->so_proto->pr_usrreq)(so, PRU_RCVD, NULL, (struct mbuf *)0L, NULL, NULL); /* Receive buffer did shrink by len bytes, adjust oob. */ state = so->so_state; so->so_state &= ~SS_RCVATMARK; oobmark = so->so_oobmark; so->so_oobmark = oobmark > len ? oobmark - len : 0; if (oobmark) { if (oobmark == len) so->so_state |= SS_RCVATMARK; if (oobmark >= len) oobmark = 0; } /* * Handle oob data. If any malloc fails, ignore error. * TCP urgent data is not very reliable anyway. */ while (m && ((state & SS_RCVATMARK) || oobmark) && (so->so_options & SO_OOBINLINE)) { struct mbuf *o = NULL; if (state & SS_RCVATMARK) { o = m_get(wait, MT_DATA); state &= ~SS_RCVATMARK; } else if (oobmark) { o = m_split(m, oobmark, wait); if (o) { error = (*sosp->so_proto->pr_usrreq)(sosp, PRU_SEND, m, NULL, NULL, NULL); m = NULL; if (error) { m_freem(o); if (sosp->so_state & SS_CANTSENDMORE) error = EPIPE; goto release; } len -= oobmark; so->so_splicelen += oobmark; m = o; o = m_get(wait, MT_DATA); } oobmark = 0; } if (o) { o->m_len = 1; *mtod(o, caddr_t) = *mtod(m, caddr_t); error = (*sosp->so_proto->pr_usrreq)(sosp, PRU_SENDOOB, o, NULL, NULL, NULL); if (error) { if (sosp->so_state & SS_CANTSENDMORE) error = EPIPE; goto release; } len -= 1; so->so_splicelen += 1; if (oobmark) { oobmark -= 1; if (oobmark == 0) state |= SS_RCVATMARK; } m_adj(m, 1); } } /* Append all remaining data to drain socket. */ if (m) { if (so->so_rcv.sb_cc == 0 || maxreached) sosp->so_state &= ~SS_ISSENDING; error = (*sosp->so_proto->pr_usrreq)(sosp, PRU_SEND, m, NULL, NULL, NULL); m = NULL; if (error) { if (sosp->so_state & SS_CANTSENDMORE) error = EPIPE; goto release; } so->so_splicelen += len; } release: if (m) m_freem(m); sosp->so_state &= ~SS_ISSENDING; if (error) so->so_error = error; if (((so->so_state & SS_CANTRCVMORE) && so->so_rcv.sb_cc == 0) || (sosp->so_state & SS_CANTSENDMORE) || maxreached || error) { sounsplice(so, sosp, 1); return (0); } if (timerisset(&so->so_idletv)) timeout_add_tv(&so->so_idleto, &so->so_idletv); return (1); } void sorwakeup(struct socket *so) { if (so->so_rcv.sb_flags & SB_SPLICE) { (void) somove(so, M_DONTWAIT); return; } _sorwakeup(so); } void sowwakeup(struct socket *so) { if (so->so_snd.sb_flags & SB_SPLICE) (void) somove(so->so_spliceback, M_DONTWAIT); _sowwakeup(so); } void soidle(void *arg) { struct socket *so = arg; int s; s = splsoftnet(); so->so_error = ETIMEDOUT; sounsplice(so, so->so_splice, 1); splx(s); } #endif /* SOCKET_SPLICE */ int sosetopt(struct socket *so, int level, int optname, struct mbuf *m0) { int error = 0; struct mbuf *m = m0; if (level != SOL_SOCKET) { if (so->so_proto && so->so_proto->pr_ctloutput) return ((*so->so_proto->pr_ctloutput) (PRCO_SETOPT, so, level, optname, &m0)); error = ENOPROTOOPT; } else { switch (optname) { case SO_BINDANY: if ((error = suser(curproc, 0)) != 0) /* XXX */ goto bad; break; } switch (optname) { case SO_LINGER: if (m == NULL || m->m_len != sizeof (struct linger) || mtod(m, struct linger *)->l_linger < 0 || mtod(m, struct linger *)->l_linger > SHRT_MAX) { error = EINVAL; goto bad; } so->so_linger = mtod(m, struct linger *)->l_linger; /* FALLTHROUGH */ case SO_BINDANY: case SO_DEBUG: case SO_KEEPALIVE: case SO_DONTROUTE: case SO_USELOOPBACK: case SO_BROADCAST: case SO_REUSEADDR: case SO_REUSEPORT: case SO_OOBINLINE: case SO_TIMESTAMP: if (m == NULL || m->m_len < sizeof (int)) { error = EINVAL; goto bad; } if (*mtod(m, int *)) so->so_options |= optname; else so->so_options &= ~optname; break; case SO_SNDBUF: case SO_RCVBUF: case SO_SNDLOWAT: case SO_RCVLOWAT: { u_long cnt; if (m == NULL || m->m_len < sizeof (int)) { error = EINVAL; goto bad; } cnt = *mtod(m, int *); if ((long)cnt <= 0) cnt = 1; switch (optname) { case SO_SNDBUF: if (so->so_state & SS_CANTSENDMORE) { error = EINVAL; goto bad; } if (sbcheckreserve(cnt, so->so_snd.sb_wat) || sbreserve(&so->so_snd, cnt)) { error = ENOBUFS; goto bad; } so->so_snd.sb_wat = cnt; break; case SO_RCVBUF: if (so->so_state & SS_CANTRCVMORE) { error = EINVAL; goto bad; } if (sbcheckreserve(cnt, so->so_rcv.sb_wat) || sbreserve(&so->so_rcv, cnt)) { error = ENOBUFS; goto bad; } so->so_rcv.sb_wat = cnt; break; case SO_SNDLOWAT: so->so_snd.sb_lowat = (cnt > so->so_snd.sb_hiwat) ? so->so_snd.sb_hiwat : cnt; break; case SO_RCVLOWAT: so->so_rcv.sb_lowat = (cnt > so->so_rcv.sb_hiwat) ? so->so_rcv.sb_hiwat : cnt; break; } break; } case SO_SNDTIMEO: case SO_RCVTIMEO: { struct timeval *tv; u_short val; if (m == NULL || m->m_len < sizeof (*tv)) { error = EINVAL; goto bad; } tv = mtod(m, struct timeval *); if (tv->tv_sec > (USHRT_MAX - tv->tv_usec / tick) / hz) { error = EDOM; goto bad; } val = tv->tv_sec * hz + tv->tv_usec / tick; if (val == 0 && tv->tv_usec != 0) val = 1; switch (optname) { case SO_SNDTIMEO: so->so_snd.sb_timeo = val; break; case SO_RCVTIMEO: so->so_rcv.sb_timeo = val; break; } break; } case SO_RTABLE: if (so->so_proto && so->so_proto->pr_domain && so->so_proto->pr_domain->dom_protosw && so->so_proto->pr_ctloutput) { struct domain *dom = so->so_proto->pr_domain; level = dom->dom_protosw->pr_protocol; return ((*so->so_proto->pr_ctloutput) (PRCO_SETOPT, so, level, optname, &m0)); } error = ENOPROTOOPT; break; #ifdef SOCKET_SPLICE case SO_SPLICE: if (m == NULL) { error = sosplice(so, -1, 0, NULL); } else if (m->m_len < sizeof(int)) { error = EINVAL; goto bad; } else if (m->m_len < sizeof(struct splice)) { error = sosplice(so, *mtod(m, int *), 0, NULL); } else { error = sosplice(so, mtod(m, struct splice *)->sp_fd, mtod(m, struct splice *)->sp_max, &mtod(m, struct splice *)->sp_idle); } break; #endif /* SOCKET_SPLICE */ default: error = ENOPROTOOPT; break; } if (error == 0 && so->so_proto && so->so_proto->pr_ctloutput) { (void) ((*so->so_proto->pr_ctloutput) (PRCO_SETOPT, so, level, optname, &m0)); m = NULL; /* freed by protocol */ } } bad: if (m) (void) m_free(m); return (error); } int sogetopt(struct socket *so, int level, int optname, struct mbuf **mp) { struct mbuf *m; if (level != SOL_SOCKET) { if (so->so_proto && so->so_proto->pr_ctloutput) { return ((*so->so_proto->pr_ctloutput) (PRCO_GETOPT, so, level, optname, mp)); } else return (ENOPROTOOPT); } else { m = m_get(M_WAIT, MT_SOOPTS); m->m_len = sizeof (int); switch (optname) { case SO_LINGER: m->m_len = sizeof (struct linger); mtod(m, struct linger *)->l_onoff = so->so_options & SO_LINGER; mtod(m, struct linger *)->l_linger = so->so_linger; break; case SO_BINDANY: case SO_USELOOPBACK: case SO_DONTROUTE: case SO_DEBUG: case SO_KEEPALIVE: case SO_REUSEADDR: case SO_REUSEPORT: case SO_BROADCAST: case SO_OOBINLINE: case SO_TIMESTAMP: *mtod(m, int *) = so->so_options & optname; break; case SO_TYPE: *mtod(m, int *) = so->so_type; break; case SO_ERROR: *mtod(m, int *) = so->so_error; so->so_error = 0; break; case SO_SNDBUF: *mtod(m, int *) = so->so_snd.sb_hiwat; break; case SO_RCVBUF: *mtod(m, int *) = so->so_rcv.sb_hiwat; break; case SO_SNDLOWAT: *mtod(m, int *) = so->so_snd.sb_lowat; break; case SO_RCVLOWAT: *mtod(m, int *) = so->so_rcv.sb_lowat; break; case SO_SNDTIMEO: case SO_RCVTIMEO: { int val = (optname == SO_SNDTIMEO ? so->so_snd.sb_timeo : so->so_rcv.sb_timeo); m->m_len = sizeof(struct timeval); mtod(m, struct timeval *)->tv_sec = val / hz; mtod(m, struct timeval *)->tv_usec = (val % hz) * tick; break; } case SO_RTABLE: (void)m_free(m); if (so->so_proto && so->so_proto->pr_domain && so->so_proto->pr_domain->dom_protosw && so->so_proto->pr_ctloutput) { struct domain *dom = so->so_proto->pr_domain; level = dom->dom_protosw->pr_protocol; return ((*so->so_proto->pr_ctloutput) (PRCO_GETOPT, so, level, optname, mp)); } return (ENOPROTOOPT); break; #ifdef SOCKET_SPLICE case SO_SPLICE: { int s = splsoftnet(); m->m_len = sizeof(off_t); *mtod(m, off_t *) = so->so_splicelen; splx(s); break; } #endif /* SOCKET_SPLICE */ case SO_PEERCRED: if (so->so_proto->pr_protocol == AF_UNIX) { struct unpcb *unp = sotounpcb(so); if (unp->unp_flags & UNP_FEIDS) { m->m_len = sizeof(unp->unp_connid); bcopy((caddr_t)(&(unp->unp_connid)), mtod(m, caddr_t), m->m_len); break; } (void)m_free(m); return (ENOTCONN); } (void)m_free(m); return (EOPNOTSUPP); break; default: (void)m_free(m); return (ENOPROTOOPT); } *mp = m; return (0); } } void sohasoutofband(struct socket *so) { csignal(so->so_pgid, SIGURG, so->so_siguid, so->so_sigeuid); selwakeup(&so->so_rcv.sb_sel); } int soo_kqfilter(struct file *fp, struct knote *kn) { struct socket *so = (struct socket *)kn->kn_fp->f_data; struct sockbuf *sb; int s; switch (kn->kn_filter) { case EVFILT_READ: if (so->so_options & SO_ACCEPTCONN) kn->kn_fop = &solisten_filtops; else kn->kn_fop = &soread_filtops; sb = &so->so_rcv; break; case EVFILT_WRITE: kn->kn_fop = &sowrite_filtops; sb = &so->so_snd; break; default: return (EINVAL); } s = splnet(); SLIST_INSERT_HEAD(&sb->sb_sel.si_note, kn, kn_selnext); sb->sb_flags |= SB_KNOTE; splx(s); return (0); } void filt_sordetach(struct knote *kn) { struct socket *so = (struct socket *)kn->kn_fp->f_data; int s = splnet(); SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext); if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note)) so->so_rcv.sb_flags &= ~SB_KNOTE; splx(s); } /*ARGSUSED*/ int filt_soread(struct knote *kn, long hint) { struct socket *so = (struct socket *)kn->kn_fp->f_data; kn->kn_data = so->so_rcv.sb_cc; #ifdef SOCKET_SPLICE if (so->so_splice) return (0); #endif /* SOCKET_SPLICE */ if (so->so_state & SS_CANTRCVMORE) { kn->kn_flags |= EV_EOF; kn->kn_fflags = so->so_error; return (1); } if (so->so_error) /* temporary udp error */ return (1); if (kn->kn_sfflags & NOTE_LOWAT) return (kn->kn_data >= kn->kn_sdata); return (kn->kn_data >= so->so_rcv.sb_lowat); } void filt_sowdetach(struct knote *kn) { struct socket *so = (struct socket *)kn->kn_fp->f_data; int s = splnet(); SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext); if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note)) so->so_snd.sb_flags &= ~SB_KNOTE; splx(s); } /*ARGSUSED*/ int filt_sowrite(struct knote *kn, long hint) { struct socket *so = (struct socket *)kn->kn_fp->f_data; kn->kn_data = sbspace(&so->so_snd); if (so->so_state & SS_CANTSENDMORE) { kn->kn_flags |= EV_EOF; kn->kn_fflags = so->so_error; return (1); } if (so->so_error) /* temporary udp error */ return (1); if (((so->so_state & SS_ISCONNECTED) == 0) && (so->so_proto->pr_flags & PR_CONNREQUIRED)) return (0); if (kn->kn_sfflags & NOTE_LOWAT) return (kn->kn_data >= kn->kn_sdata); return (kn->kn_data >= so->so_snd.sb_lowat); } /*ARGSUSED*/ int filt_solisten(struct knote *kn, long hint) { struct socket *so = (struct socket *)kn->kn_fp->f_data; kn->kn_data = so->so_qlen; return (so->so_qlen != 0); }