/* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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_socket2.c 8.1 (Berkeley) 6/10/93 * $Id: uipc_socket2.c,v 1.30 1997/09/07 16:53:48 bde Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include /* * Primitive routines for operating on sockets and socket buffers */ u_long sb_max = SB_MAX; /* XXX should be static */ static u_long sb_efficiency = 8; /* parameter for sbreserve() */ /* * Procedures to manipulate state flags of socket * and do appropriate wakeups. Normal sequence from the * active (originating) side is that soisconnecting() is * called during processing of connect() call, * resulting in an eventual call to soisconnected() if/when the * connection is established. When the connection is torn down * soisdisconnecting() is called during processing of disconnect() call, * and soisdisconnected() is called when the connection to the peer * is totally severed. The semantics of these routines are such that * connectionless protocols can call soisconnected() and soisdisconnected() * only, bypassing the in-progress calls when setting up a ``connection'' * takes no time. * * From the passive side, a socket is created with * two queues of sockets: so_q0 for connections in progress * and so_q for connections already made and awaiting user acceptance. * As a protocol is preparing incoming connections, it creates a socket * structure queued on so_q0 by calling sonewconn(). When the connection * is established, soisconnected() is called, and transfers the * socket structure to so_q, making it available to accept(). * * If a socket is closed with sockets on either * so_q0 or so_q, these sockets are dropped. * * If higher level protocols are implemented in * the kernel, the wakeups done here will sometimes * cause software-interrupt process scheduling. */ void soisconnecting(so) register struct socket *so; { so->so_state &= ~(SS_ISCONNECTED|SS_ISDISCONNECTING); so->so_state |= SS_ISCONNECTING; } void soisconnected(so) register struct socket *so; { register struct socket *head = so->so_head; so->so_state &= ~(SS_ISCONNECTING|SS_ISDISCONNECTING|SS_ISCONFIRMING); so->so_state |= SS_ISCONNECTED; if (head && (so->so_state & SS_INCOMP)) { TAILQ_REMOVE(&head->so_incomp, so, so_list); head->so_incqlen--; so->so_state &= ~SS_INCOMP; TAILQ_INSERT_TAIL(&head->so_comp, so, so_list); so->so_state |= SS_COMP; sorwakeup(head); wakeup_one(&head->so_timeo); } else { wakeup(&so->so_timeo); sorwakeup(so); sowwakeup(so); } } void soisdisconnecting(so) register struct socket *so; { so->so_state &= ~SS_ISCONNECTING; so->so_state |= (SS_ISDISCONNECTING|SS_CANTRCVMORE|SS_CANTSENDMORE); wakeup((caddr_t)&so->so_timeo); sowwakeup(so); sorwakeup(so); } void soisdisconnected(so) register struct socket *so; { so->so_state &= ~(SS_ISCONNECTING|SS_ISCONNECTED|SS_ISDISCONNECTING); so->so_state |= (SS_CANTRCVMORE|SS_CANTSENDMORE); wakeup((caddr_t)&so->so_timeo); sowwakeup(so); sorwakeup(so); } /* * Return a random connection that hasn't been serviced yet and * is eligible for discard. There is a one in qlen chance that * we will return a null, saying that there are no dropable * requests. In this case, the protocol specific code should drop * the new request. This insures fairness. * * This may be used in conjunction with protocol specific queue * congestion routines. */ struct socket * sodropablereq(head) register struct socket *head; { register struct socket *so; unsigned int i, j, qlen; static int rnd; static long old_mono_secs; static unsigned int cur_cnt, old_cnt; if ((i = (mono_time.tv_sec - old_mono_secs)) != 0) { old_mono_secs = mono_time.tv_sec; old_cnt = cur_cnt / i; cur_cnt = 0; } so = TAILQ_FIRST(&head->so_incomp); if (!so) return (so); qlen = head->so_incqlen; if (++cur_cnt > qlen || old_cnt > qlen) { rnd = (314159 * rnd + 66329) & 0xffff; j = ((qlen + 1) * rnd) >> 16; while (j-- && so) so = TAILQ_NEXT(so, so_list); } return (so); } /* * When an attempt at a new connection is noted on a socket * which accepts connections, sonewconn is called. If the * connection is possible (subject to space constraints, etc.) * then we allocate a new structure, propoerly linked into the * data structure of the original socket, and return this. * Connstatus may be 0, or SO_ISCONFIRMING, or SO_ISCONNECTED. */ struct socket * sonewconn(head, connstatus) register struct socket *head; int connstatus; { register struct socket *so; if (head->so_qlen > 3 * head->so_qlimit / 2) return ((struct socket *)0); MALLOC(so, struct socket *, sizeof(*so), M_SOCKET, M_DONTWAIT); if (so == NULL) return ((struct socket *)0); bzero((caddr_t)so, sizeof(*so)); so->so_head = head; so->so_type = head->so_type; so->so_options = head->so_options &~ SO_ACCEPTCONN; so->so_linger = head->so_linger; so->so_state = head->so_state | SS_NOFDREF; so->so_proto = head->so_proto; so->so_timeo = head->so_timeo; so->so_pgid = head->so_pgid; so->so_uid = head->so_uid; (void) soreserve(so, head->so_snd.sb_hiwat, head->so_rcv.sb_hiwat); if ((*so->so_proto->pr_usrreqs->pru_attach)(so, 0, NULL)) { (void) free((caddr_t)so, M_SOCKET); return ((struct socket *)0); } if (connstatus) { TAILQ_INSERT_TAIL(&head->so_comp, so, so_list); so->so_state |= SS_COMP; } else { TAILQ_INSERT_TAIL(&head->so_incomp, so, so_list); so->so_state |= SS_INCOMP; head->so_incqlen++; } head->so_qlen++; if (connstatus) { sorwakeup(head); wakeup((caddr_t)&head->so_timeo); so->so_state |= connstatus; } return (so); } /* * Socantsendmore indicates that no more data will be sent on the * socket; it would normally be applied to a socket when the user * informs the system that no more data is to be sent, by the protocol * code (in case PRU_SHUTDOWN). Socantrcvmore indicates that no more data * will be received, and will normally be applied to the socket by a * protocol when it detects that the peer will send no more data. * Data queued for reading in the socket may yet be read. */ void socantsendmore(so) struct socket *so; { so->so_state |= SS_CANTSENDMORE; sowwakeup(so); } void socantrcvmore(so) struct socket *so; { so->so_state |= SS_CANTRCVMORE; sorwakeup(so); } /* * Wait for data to arrive at/drain from a socket buffer. */ int sbwait(sb) struct sockbuf *sb; { sb->sb_flags |= SB_WAIT; return (tsleep((caddr_t)&sb->sb_cc, (sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK | PCATCH, "sbwait", sb->sb_timeo)); } /* * Lock a sockbuf already known to be locked; * return any error returned from sleep (EINTR). */ int sb_lock(sb) register struct sockbuf *sb; { int error; while (sb->sb_flags & SB_LOCK) { sb->sb_flags |= SB_WANT; error = tsleep((caddr_t)&sb->sb_flags, (sb->sb_flags & SB_NOINTR) ? PSOCK : PSOCK|PCATCH, "sblock", 0); if (error) return (error); } sb->sb_flags |= SB_LOCK; return (0); } /* * Wakeup processes waiting on a socket buffer. * Do asynchronous notification via SIGIO * if the socket has the SS_ASYNC flag set. */ void sowakeup(so, sb) register struct socket *so; register struct sockbuf *sb; { struct proc *p; selwakeup(&sb->sb_sel); sb->sb_flags &= ~SB_SEL; if (sb->sb_flags & SB_WAIT) { sb->sb_flags &= ~SB_WAIT; wakeup((caddr_t)&sb->sb_cc); } if (so->so_state & SS_ASYNC) { if (so->so_pgid < 0) gsignal(-so->so_pgid, SIGIO); else if (so->so_pgid > 0 && (p = pfind(so->so_pgid)) != 0) psignal(p, SIGIO); } } /* * Socket buffer (struct sockbuf) utility routines. * * Each socket contains two socket buffers: one for sending data and * one for receiving data. Each buffer contains a queue of mbufs, * information about the number of mbufs and amount of data in the * queue, and other fields allowing select() statements and notification * on data availability to be implemented. * * Data stored in a socket buffer is maintained as a list of records. * Each record is a list of mbufs chained together with the m_next * field. Records are chained together with the m_nextpkt field. The upper * level routine soreceive() expects the following conventions to be * observed when placing information in the receive buffer: * * 1. If the protocol requires each message be preceded by the sender's * name, then a record containing that name must be present before * any associated data (mbuf's must be of type MT_SONAME). * 2. If the protocol supports the exchange of ``access rights'' (really * just additional data associated with the message), and there are * ``rights'' to be received, then a record containing this data * should be present (mbuf's must be of type MT_RIGHTS). * 3. If a name or rights record exists, then it must be followed by * a data record, perhaps of zero length. * * Before using a new socket structure it is first necessary to reserve * buffer space to the socket, by calling sbreserve(). This should commit * some of the available buffer space in the system buffer pool for the * socket (currently, it does nothing but enforce limits). The space * should be released by calling sbrelease() when the socket is destroyed. */ int soreserve(so, sndcc, rcvcc) register struct socket *so; u_long sndcc, rcvcc; { if (sbreserve(&so->so_snd, sndcc) == 0) goto bad; if (sbreserve(&so->so_rcv, rcvcc) == 0) goto bad2; if (so->so_rcv.sb_lowat == 0) so->so_rcv.sb_lowat = 1; if (so->so_snd.sb_lowat == 0) so->so_snd.sb_lowat = MCLBYTES; if (so->so_snd.sb_lowat > so->so_snd.sb_hiwat) so->so_snd.sb_lowat = so->so_snd.sb_hiwat; return (0); bad2: sbrelease(&so->so_snd); bad: return (ENOBUFS); } /* * Allot mbufs to a sockbuf. * Attempt to scale mbmax so that mbcnt doesn't become limiting * if buffering efficiency is near the normal case. */ int sbreserve(sb, cc) struct sockbuf *sb; u_long cc; { if ((u_quad_t)cc > (u_quad_t)sb_max * MCLBYTES / (MSIZE + MCLBYTES)) return (0); sb->sb_hiwat = cc; sb->sb_mbmax = min(cc * sb_efficiency, sb_max); if (sb->sb_lowat > sb->sb_hiwat) sb->sb_lowat = sb->sb_hiwat; return (1); } /* * Free mbufs held by a socket, and reserved mbuf space. */ void sbrelease(sb) struct sockbuf *sb; { sbflush(sb); sb->sb_hiwat = sb->sb_mbmax = 0; } /* * Routines to add and remove * data from an mbuf queue. * * The routines sbappend() or sbappendrecord() are normally called to * append new mbufs to a socket buffer, after checking that adequate * space is available, comparing the function sbspace() with the amount * of data to be added. sbappendrecord() differs from sbappend() in * that data supplied is treated as the beginning of a new record. * To place a sender's address, optional access rights, and data in a * socket receive buffer, sbappendaddr() should be used. To place * access rights and data in a socket receive buffer, sbappendrights() * should be used. In either case, the new data begins a new record. * Note that unlike sbappend() and sbappendrecord(), these routines check * for the caller that there will be enough space to store the data. * Each fails if there is not enough space, or if it cannot find mbufs * to store additional information in. * * Reliable protocols may use the socket send buffer to hold data * awaiting acknowledgement. Data is normally copied from a socket * send buffer in a protocol with m_copy for output to a peer, * and then removing the data from the socket buffer with sbdrop() * or sbdroprecord() when the data is acknowledged by the peer. */ /* * Append mbuf chain m to the last record in the * socket buffer sb. The additional space associated * the mbuf chain is recorded in sb. Empty mbufs are * discarded and mbufs are compacted where possible. */ void sbappend(sb, m) struct sockbuf *sb; struct mbuf *m; { register struct mbuf *n; if (m == 0) return; n = sb->sb_mb; if (n) { while (n->m_nextpkt) n = n->m_nextpkt; do { if (n->m_flags & M_EOR) { sbappendrecord(sb, m); /* XXXXXX!!!! */ return; } } while (n->m_next && (n = n->m_next)); } sbcompress(sb, m, n); } #ifdef SOCKBUF_DEBUG void sbcheck(sb) register struct sockbuf *sb; { register struct mbuf *m; register int len = 0, mbcnt = 0; for (m = sb->sb_mb; m; m = m->m_next) { len += m->m_len; mbcnt += MSIZE; if (m->m_flags & M_EXT) /*XXX*/ /* pretty sure this is bogus */ mbcnt += m->m_ext.ext_size; if (m->m_nextpkt) panic("sbcheck nextpkt"); } if (len != sb->sb_cc || mbcnt != sb->sb_mbcnt) { printf("cc %d != %d || mbcnt %d != %d\n", len, sb->sb_cc, mbcnt, sb->sb_mbcnt); panic("sbcheck"); } } #endif /* * As above, except the mbuf chain * begins a new record. */ void sbappendrecord(sb, m0) register struct sockbuf *sb; register struct mbuf *m0; { register struct mbuf *m; if (m0 == 0) return; m = sb->sb_mb; if (m) while (m->m_nextpkt) m = m->m_nextpkt; /* * Put the first mbuf on the queue. * Note this permits zero length records. */ sballoc(sb, m0); if (m) m->m_nextpkt = m0; else sb->sb_mb = m0; m = m0->m_next; m0->m_next = 0; if (m && (m0->m_flags & M_EOR)) { m0->m_flags &= ~M_EOR; m->m_flags |= M_EOR; } sbcompress(sb, m, m0); } /* * As above except that OOB data * is inserted at the beginning of the sockbuf, * but after any other OOB data. */ void sbinsertoob(sb, m0) register struct sockbuf *sb; register struct mbuf *m0; { register struct mbuf *m; register struct mbuf **mp; if (m0 == 0) return; for (mp = &sb->sb_mb; *mp ; mp = &((*mp)->m_nextpkt)) { m = *mp; again: switch (m->m_type) { case MT_OOBDATA: continue; /* WANT next train */ case MT_CONTROL: m = m->m_next; if (m) goto again; /* inspect THIS train further */ } break; } /* * Put the first mbuf on the queue. * Note this permits zero length records. */ sballoc(sb, m0); m0->m_nextpkt = *mp; *mp = m0; m = m0->m_next; m0->m_next = 0; if (m && (m0->m_flags & M_EOR)) { m0->m_flags &= ~M_EOR; m->m_flags |= M_EOR; } sbcompress(sb, m, m0); } /* * Append address and data, and optionally, control (ancillary) data * to the receive queue of a socket. If present, * m0 must include a packet header with total length. * Returns 0 if no space in sockbuf or insufficient mbufs. */ int sbappendaddr(sb, asa, m0, control) register struct sockbuf *sb; struct sockaddr *asa; struct mbuf *m0, *control; { register struct mbuf *m, *n; int space = asa->sa_len; if (m0 && (m0->m_flags & M_PKTHDR) == 0) panic("sbappendaddr"); if (m0) space += m0->m_pkthdr.len; for (n = control; n; n = n->m_next) { space += n->m_len; if (n->m_next == 0) /* keep pointer to last control buf */ break; } if (space > sbspace(sb)) return (0); if (asa->sa_len > MLEN) return (0); MGET(m, M_DONTWAIT, MT_SONAME); if (m == 0) return (0); m->m_len = asa->sa_len; bcopy((caddr_t)asa, mtod(m, caddr_t), asa->sa_len); if (n) n->m_next = m0; /* concatenate data to control */ else control = m0; m->m_next = control; for (n = m; n; n = n->m_next) sballoc(sb, n); n = sb->sb_mb; if (n) { while (n->m_nextpkt) n = n->m_nextpkt; n->m_nextpkt = m; } else sb->sb_mb = m; return (1); } int sbappendcontrol(sb, m0, control) struct sockbuf *sb; struct mbuf *control, *m0; { register struct mbuf *m, *n; int space = 0; if (control == 0) panic("sbappendcontrol"); for (m = control; ; m = m->m_next) { space += m->m_len; if (m->m_next == 0) break; } n = m; /* save pointer to last control buffer */ for (m = m0; m; m = m->m_next) space += m->m_len; if (space > sbspace(sb)) return (0); n->m_next = m0; /* concatenate data to control */ for (m = control; m; m = m->m_next) sballoc(sb, m); n = sb->sb_mb; if (n) { while (n->m_nextpkt) n = n->m_nextpkt; n->m_nextpkt = control; } else sb->sb_mb = control; return (1); } /* * Compress mbuf chain m into the socket * buffer sb following mbuf n. If n * is null, the buffer is presumed empty. */ void sbcompress(sb, m, n) register struct sockbuf *sb; register struct mbuf *m, *n; { register int eor = 0; register struct mbuf *o; while (m) { eor |= m->m_flags & M_EOR; if (m->m_len == 0 && (eor == 0 || (((o = m->m_next) || (o = n)) && o->m_type == m->m_type))) { m = m_free(m); continue; } if (n && (n->m_flags & (M_EXT | M_EOR)) == 0 && (n->m_data + n->m_len + m->m_len) < &n->m_dat[MLEN] && n->m_type == m->m_type) { bcopy(mtod(m, caddr_t), mtod(n, caddr_t) + n->m_len, (unsigned)m->m_len); n->m_len += m->m_len; sb->sb_cc += m->m_len; m = m_free(m); continue; } if (n) n->m_next = m; else sb->sb_mb = m; sballoc(sb, m); n = m; m->m_flags &= ~M_EOR; m = m->m_next; n->m_next = 0; } if (eor) { if (n) n->m_flags |= eor; else printf("semi-panic: sbcompress\n"); } } /* * Free all mbufs in a sockbuf. * Check that all resources are reclaimed. */ void sbflush(sb) register struct sockbuf *sb; { if (sb->sb_flags & SB_LOCK) panic("sbflush"); while (sb->sb_mbcnt) sbdrop(sb, (int)sb->sb_cc); if (sb->sb_cc || sb->sb_mb) panic("sbflush 2"); } /* * Drop data from (the front of) a sockbuf. */ void sbdrop(sb, len) register struct sockbuf *sb; register int len; { register struct mbuf *m, *mn; struct mbuf *next; next = (m = sb->sb_mb) ? m->m_nextpkt : 0; while (len > 0) { if (m == 0) { if (next == 0) panic("sbdrop"); m = next; next = m->m_nextpkt; continue; } if (m->m_len > len) { m->m_len -= len; m->m_data += len; sb->sb_cc -= len; break; } len -= m->m_len; sbfree(sb, m); MFREE(m, mn); m = mn; } while (m && m->m_len == 0) { sbfree(sb, m); MFREE(m, mn); m = mn; } if (m) { sb->sb_mb = m; m->m_nextpkt = next; } else sb->sb_mb = next; } /* * Drop a record off the front of a sockbuf * and move the next record to the front. */ void sbdroprecord(sb) register struct sockbuf *sb; { register struct mbuf *m, *mn; m = sb->sb_mb; if (m) { sb->sb_mb = m->m_nextpkt; do { sbfree(sb, m); MFREE(m, mn); m = mn; } while (m); } } /* * Create a "control" mbuf containing the specified data * with the specified type for presentation on a socket buffer. */ struct mbuf * sbcreatecontrol(p, size, type, level) caddr_t p; register int size; int type, level; { register struct cmsghdr *cp; struct mbuf *m; if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL) return ((struct mbuf *) NULL); cp = mtod(m, struct cmsghdr *); /* XXX check size? */ (void)memcpy(CMSG_DATA(cp), p, size); size += sizeof(*cp); m->m_len = size; cp->cmsg_len = size; cp->cmsg_level = level; cp->cmsg_type = type; return (m); } /* * Some routines that return EOPNOTSUPP for entry points that are not * supported by a protocol. Fill in as needed. */ int pru_accept_notsupp(struct socket *so, struct sockaddr **nam) { return EOPNOTSUPP; } int pru_connect_notsupp(struct socket *so, struct sockaddr *nam, struct proc *p) { return EOPNOTSUPP; } int pru_connect2_notsupp(struct socket *so1, struct socket *so2) { return EOPNOTSUPP; } int pru_control_notsupp(struct socket *so, int cmd, caddr_t data, struct ifnet *ifp, struct proc *p) { return EOPNOTSUPP; } int pru_listen_notsupp(struct socket *so, struct proc *p) { return EOPNOTSUPP; } int pru_rcvd_notsupp(struct socket *so, int flags) { return EOPNOTSUPP; } int pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags) { return EOPNOTSUPP; } /* * This isn't really a ``null'' operation, but it's the default one * and doesn't do anything destructive. */ int pru_sense_null(struct socket *so, struct stat *sb) { sb->st_blksize = so->so_snd.sb_hiwat; return 0; } /* * Make a copy of a sockaddr in a malloced buffer of type M_SONAME. */ struct sockaddr * dup_sockaddr(sa, canwait) struct sockaddr *sa; int canwait; { struct sockaddr *sa2; MALLOC(sa2, struct sockaddr *, sa->sa_len, M_SONAME, canwait ? M_WAITOK : M_NOWAIT); if (sa2) bcopy(sa, sa2, sa->sa_len); return sa2; } /* * Here is the definition of some of the basic objects in the kern.ipc * branch of the MIB. */ SYSCTL_NODE(_kern, KERN_IPC, ipc, CTLFLAG_RW, 0, "IPC"); /* This takes the place of kern.maxsockbuf, which moved to kern.ipc. */ static int dummy; SYSCTL_INT(_kern, KERN_DUMMY, dummy, CTLFLAG_RW, &dummy, 0, ""); SYSCTL_INT(_kern_ipc, KIPC_MAXSOCKBUF, maxsockbuf, CTLFLAG_RW, &sb_max, 0, ""); SYSCTL_INT(_kern_ipc, KIPC_SOCKBUF_WASTE, sockbuf_waste_factor, CTLFLAG_RW, &sb_efficiency, 0, "");