xref: /csrg-svn/sys/kern/uipc_socket.c (revision 5281)
1*5281Sroot /*	uipc_socket.c	4.20	81/12/21	*/
24786Swnj 
34786Swnj #include "../h/param.h"
44829Swnj #include "../h/systm.h"
54786Swnj #include "../h/dir.h"
64786Swnj #include "../h/user.h"
74829Swnj #include "../h/proc.h"
84829Swnj #include "../h/file.h"
94786Swnj #include "../h/inode.h"
104829Swnj #include "../h/buf.h"
114786Swnj #include "../h/mbuf.h"
124829Swnj #include "../h/protosw.h"
134829Swnj #include "../h/socket.h"
144829Swnj #include "../h/socketvar.h"
154916Swnj #include "../h/stat.h"
16*5281Sroot #include "../h/ioctl.h"
175095Swnj #include "../net/in.h"
185095Swnj #include "../net/in_systm.h"
194786Swnj 
204786Swnj /*
214890Swnj  * Socket support routines.
224890Swnj  *
234890Swnj  * DEAL WITH INTERRUPT NOTIFICATION.
244786Swnj  */
254786Swnj 
264786Swnj /*
274786Swnj  * Create a socket.
284786Swnj  */
294927Swnj socreate(aso, type, asp, asa, options)
304786Swnj 	struct socket **aso;
314786Swnj 	int type;
324927Swnj 	struct sockproto *asp;
334927Swnj 	struct sockaddr *asa;
344829Swnj 	int options;
354786Swnj {
364786Swnj 	register struct protosw *prp;
374786Swnj 	register struct socket *so;
384786Swnj 	struct mbuf *m;
394890Swnj 	int pf, proto, error;
404927Swnj COUNT(SOCREATE);
414786Swnj 
424786Swnj 	/*
434890Swnj 	 * Use process standard protocol/protocol family if none
444890Swnj 	 * specified by address argument.
454786Swnj 	 */
464927Swnj 	if (asp == 0) {
474890Swnj 		pf = PF_INET;		/* should be u.u_protof */
484786Swnj 		proto = 0;
494786Swnj 	} else {
504927Swnj 		pf = asp->sp_family;
514927Swnj 		proto = asp->sp_protocol;
524786Swnj 	}
534786Swnj 
544786Swnj 	/*
554890Swnj 	 * If protocol specified, look for it, otherwise
564890Swnj 	 * for a protocol of the correct type in the right family.
574890Swnj 	 */
584890Swnj 	if (proto)
594890Swnj 		prp = pffindproto(pf, proto);
604890Swnj 	else
614890Swnj 		prp = pffindtype(pf, type);
624890Swnj 	if (prp == 0)
634890Swnj 		return (EPROTONOSUPPORT);
644890Swnj 
654890Swnj 	/*
664786Swnj 	 * Get a socket structure.
674786Swnj 	 */
684890Swnj 	m = m_getclr(M_WAIT);
694786Swnj 	if (m == 0)
704786Swnj 		return (ENOBUFS);
714786Swnj 	so = mtod(m, struct socket *);
724829Swnj 	so->so_options = options;
734786Swnj 
744786Swnj 	/*
754890Swnj 	 * Attach protocol to socket, initializing
764890Swnj 	 * and reserving resources.
774786Swnj 	 */
784786Swnj 	so->so_proto = prp;
794979Swnj 	error = (*prp->pr_usrreq)(so, PRU_ATTACH, 0, asa);
804979Swnj 	if (error) {
814971Swnj 		(void) m_free(dtom(so));
824890Swnj 		return (error);
834786Swnj 	}
844786Swnj 	*aso = so;
854786Swnj 	return (0);
864786Swnj }
874786Swnj 
884916Swnj sofree(so)
894916Swnj 	struct socket *so;
904916Swnj {
914916Swnj 
924927Swnj COUNT(SOFREE);
934950Swnj 	if (so->so_pcb || (so->so_state & SS_USERGONE) == 0)
944950Swnj 		return;
954950Swnj 	sbrelease(&so->so_snd);
964950Swnj 	sbrelease(&so->so_rcv);
974971Swnj 	(void) m_free(dtom(so));
984916Swnj }
994916Swnj 
1004786Swnj /*
1014890Swnj  * Close a socket on last file table reference removal.
1024890Swnj  * Initiate disconnect if connected.
1034890Swnj  * Free socket when disconnect complete.
1044829Swnj  */
1054890Swnj soclose(so)
1064829Swnj 	register struct socket *so;
1074829Swnj {
1084890Swnj 	int s = splnet();		/* conservative */
1094829Swnj 
1104927Swnj COUNT(SOCLOSE);
1114890Swnj 	if (so->so_pcb == 0)
1124890Swnj 		goto discard;
1134890Swnj 	if (so->so_state & SS_ISCONNECTED) {
1144890Swnj 		if ((so->so_state & SS_ISDISCONNECTING) == 0) {
1154927Swnj 			u.u_error = sodisconnect(so, (struct sockaddr *)0);
1164890Swnj 			if (u.u_error) {
1174890Swnj 				splx(s);
1184890Swnj 				return;
1194890Swnj 			}
1204890Swnj 		}
121*5281Sroot 		if (so->so_options & SO_LETDATADRAIN) {
122*5281Sroot 			if ((so->so_state & SS_ISDISCONNECTING) &&
123*5281Sroot 			    (so->so_options & SO_NBIO)) {
124*5281Sroot 				u.u_error = EINPROGRESS;
125*5281Sroot 				splx(s);
126*5281Sroot 				return;
127*5281Sroot 			}
128*5281Sroot 			while (so->so_state & SS_ISCONNECTED)
129*5281Sroot 				sleep((caddr_t)&so->so_timeo, PZERO+1);
1304890Swnj 		}
1314890Swnj 	}
1324890Swnj 	u.u_error = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 0, 0);
1334890Swnj discard:
1344950Swnj 	so->so_state |= SS_USERGONE;
1354950Swnj 	sofree(so);
1364890Swnj 	splx(s);
1374829Swnj }
1384829Swnj 
1394927Swnj sosplice(pso, so)
1404927Swnj 	struct socket *pso, *so;
1414927Swnj {
1424927Swnj 
1434927Swnj COUNT(SOSPLICE);
1445168Swnj 	if (pso->so_proto->pr_family != PF_UNIX) {
1454927Swnj 		struct socket *tso;
1464927Swnj 		tso = pso; pso = so; so = tso;
1474927Swnj 	}
1485168Swnj 	if (pso->so_proto->pr_family != PF_UNIX)
1494927Swnj 		return (EOPNOTSUPP);
1504927Swnj 	/* check types and buffer space */
1514927Swnj 	/* merge buffers */
1524927Swnj 	return (0);
1534927Swnj }
1544927Swnj 
1554916Swnj /*ARGSUSED*/
1564890Swnj sostat(so, sb)
1574829Swnj 	struct socket *so;
1584890Swnj 	struct stat *sb;
1594829Swnj {
1604829Swnj 
1614927Swnj COUNT(SOSTAT);
1624890Swnj 	return (EOPNOTSUPP);
1634829Swnj }
1644829Swnj 
1654829Swnj /*
1664927Swnj  * Accept connection on a socket.
1674927Swnj  */
1684927Swnj soaccept(so, asa)
1694927Swnj 	struct socket *so;
1704927Swnj 	struct sockaddr *asa;
1714927Swnj {
1724927Swnj 	int s = splnet();
1734927Swnj 	int error;
1744927Swnj 
1754927Swnj COUNT(SOACCEPT);
1764927Swnj 	if ((so->so_options & SO_ACCEPTCONN) == 0) {
1774927Swnj 		error = EINVAL;			/* XXX */
1784927Swnj 		goto bad;
1794927Swnj 	}
1805265Swnj 	if ((so->so_state & SS_CONNAWAITING) == 0) {
1815265Swnj 		error = ENOTCONN;
1825265Swnj 		goto bad;
1835265Swnj 	}
1845265Swnj 	so->so_state &= ~SS_CONNAWAITING;
1854927Swnj 	error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 0, (caddr_t)asa);
1864927Swnj bad:
1874927Swnj 	splx(s);
1884927Swnj 	return (error);
1894927Swnj }
1904927Swnj 
1914927Swnj /*
1924890Swnj  * Connect socket to a specified address.
1934890Swnj  * If already connected or connecting, then avoid
1944890Swnj  * the protocol entry, to keep its job simpler.
1954786Swnj  */
1964927Swnj soconnect(so, asa)
1974786Swnj 	struct socket *so;
1984927Swnj 	struct sockaddr *asa;
1994786Swnj {
2004890Swnj 	int s = splnet();
2014890Swnj 	int error;
2024786Swnj 
2034927Swnj COUNT(SOCONNECT);
2044890Swnj 	if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) {
2054890Swnj 		error = EISCONN;
2064890Swnj 		goto bad;
2074890Swnj 	}
2084927Swnj 	error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 0, (caddr_t)asa);
2094890Swnj bad:
2104890Swnj 	splx(s);
2114890Swnj 	return (error);
2124786Swnj }
2134786Swnj 
2144786Swnj /*
2154890Swnj  * Disconnect from a socket.
2164890Swnj  * Address parameter is from system call for later multicast
2174890Swnj  * protocols.  Check to make sure that connected and no disconnect
2184890Swnj  * in progress (for protocol's sake), and then invoke protocol.
2194786Swnj  */
2204927Swnj sodisconnect(so, asa)
2214786Swnj 	struct socket *so;
2224927Swnj 	struct sockaddr *asa;
2234786Swnj {
2244890Swnj 	int s = splnet();
2254890Swnj 	int error;
2264786Swnj 
2274927Swnj COUNT(SODISCONNECT);
2284890Swnj 	if ((so->so_state & SS_ISCONNECTED) == 0) {
2294890Swnj 		error = ENOTCONN;
2304890Swnj 		goto bad;
2314890Swnj 	}
2324890Swnj 	if (so->so_state & SS_ISDISCONNECTING) {
2334890Swnj 		error = EALREADY;
2344890Swnj 		goto bad;
2354890Swnj 	}
2364927Swnj 	error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 0, asa);
2374890Swnj bad:
2384890Swnj 	splx(s);
2394890Swnj 	return (error);
2404786Swnj }
2414786Swnj 
2424786Swnj /*
2434890Swnj  * Send on a socket.
2444890Swnj  * If send must go all at once and message is larger than
2454890Swnj  * send buffering, then hard error.
2464890Swnj  * Lock against other senders.
2474890Swnj  * If must go all at once and not enough room now, then
2484890Swnj  * inform user that this would block and do nothing.
2494786Swnj  */
2504927Swnj sosend(so, asa)
2514786Swnj 	register struct socket *so;
2524927Swnj 	struct sockaddr *asa;
2534786Swnj {
2544890Swnj 	struct mbuf *top = 0;
2554890Swnj 	register struct mbuf *m, **mp = ⊤
2564916Swnj 	register u_int len;
2574916Swnj 	int error = 0, space, s;
2584786Swnj 
2594927Swnj COUNT(SOSEND);
2604890Swnj 	if (so->so_state & SS_CANTSENDMORE)
2614890Swnj 		return (EPIPE);
2624890Swnj 	if (sosendallatonce(so) && u.u_count > so->so_snd.sb_hiwat)
2634890Swnj 		return (EMSGSIZE);
2644890Swnj 	if ((so->so_snd.sb_flags & SB_LOCK) && (so->so_options & SO_NBIO))
2654890Swnj 		return (EWOULDBLOCK);
2664890Swnj 	sblock(&so->so_snd);
2674890Swnj #define	snderr(errno)	{ error = errno; splx(s); goto release; }
2684890Swnj 
2694890Swnj 	s = splnet();
2704890Swnj again:
2715168Swnj 	if (so->so_error) {
2725168Swnj 		error = so->so_error;
2735168Swnj 		so->so_error = 0;
2745168Swnj 		splx(s);
2755168Swnj 		goto release;
2765168Swnj 	}
2774890Swnj 	if ((so->so_state & SS_ISCONNECTED) == 0) {
2784890Swnj 		if (so->so_proto->pr_flags & PR_CONNREQUIRED)
2794890Swnj 			snderr(ENOTCONN);
2804927Swnj 		if (asa == 0)
2814890Swnj 			snderr(EDESTADDRREQ);
2824890Swnj 	}
2834890Swnj 	if (top) {
2844927Swnj 		error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, top, asa);
2854890Swnj 		if (error) {
2864890Swnj 			splx(s);
2874786Swnj 			goto release;
2884786Swnj 		}
2894890Swnj 		top = 0;
2904890Swnj 		mp = ⊤
2914786Swnj 	}
2924979Swnj 	if (u.u_count == 0) {
2934979Swnj 		splx(s);
2944979Swnj 		goto release;
2954979Swnj 	}
2965018Swnj 	space = sbspace(&so->so_snd);
2975018Swnj 	if (space == 0 || sosendallatonce(so) && space < u.u_count) {
2984890Swnj 		if (so->so_options & SO_NBIO)
2994890Swnj 			snderr(EWOULDBLOCK);
3004890Swnj 		sbunlock(&so->so_snd);
3014890Swnj 		sbwait(&so->so_snd);
3024890Swnj 		splx(s);
3034786Swnj 		goto again;
3044786Swnj 	}
3054890Swnj 	splx(s);
3065018Swnj 	while (u.u_count && space > 0) {
3074890Swnj 		MGET(m, 1);
3084890Swnj 		if (m == NULL) {
3094890Swnj 			error = ENOBUFS;
3104890Swnj 			m_freem(top);
3114890Swnj 			goto release;
3124786Swnj 		}
3135095Swnj 		if (u.u_count >= CLBYTES && space >= CLBYTES) {
3144890Swnj 			register struct mbuf *p;
3155095Swnj 			MCLGET(p, 1);
3164890Swnj 			if (p == 0)
3174890Swnj 				goto nopages;
3184890Swnj 			m->m_off = (int)p - (int)m;
3195095Swnj 			len = CLBYTES;
3204890Swnj 		} else {
3214786Swnj nopages:
3224890Swnj 			m->m_off = MMINOFF;
3234890Swnj 			len = MIN(MLEN, u.u_count);
3244786Swnj 		}
3254890Swnj 		iomove(mtod(m, caddr_t), len, B_WRITE);
3264890Swnj 		m->m_len = len;
3274890Swnj 		*mp = m;
3284890Swnj 		mp = &m->m_next;
3295018Swnj 		space = sbspace(&so->so_snd);
3304786Swnj 	}
3314890Swnj 	s = splnet();
3324890Swnj 	goto again;
3334890Swnj 
3344786Swnj release:
3354890Swnj 	sbunlock(&so->so_snd);
3364786Swnj 	return (error);
3374786Swnj }
3384786Swnj 
3394927Swnj soreceive(so, asa)
3404786Swnj 	register struct socket *so;
3414927Swnj 	struct sockaddr *asa;
3424786Swnj {
3434786Swnj 	register struct mbuf *m, *n;
3444916Swnj 	u_int len;
3454890Swnj 	int eor, s, error = 0;
3464786Swnj 
3474927Swnj COUNT(SORECEIVE);
3484890Swnj restart:
3494890Swnj 	sblock(&so->so_rcv);
3504890Swnj 	s = splnet();
3514890Swnj 
3524890Swnj #define	rcverr(errno)	{ error = errno; splx(s); goto release; }
3534786Swnj 	if (so->so_rcv.sb_cc == 0) {
3545168Swnj 		if (so->so_error) {
3555168Swnj 			error = so->so_error;
3565168Swnj 			so->so_error = 0;
3575168Swnj 			splx(s);
3585168Swnj 			goto release;
3595168Swnj 		}
3604890Swnj 		if (so->so_state & SS_CANTRCVMORE) {
3614890Swnj 			splx(s);
3624890Swnj 			goto release;
3634890Swnj 		}
3645015Sroot 		if ((so->so_state & SS_ISCONNECTED) == 0 &&
3655015Sroot 		    (so->so_proto->pr_flags & PR_CONNREQUIRED))
3665015Sroot 			rcverr(ENOTCONN);
3674890Swnj 		if (so->so_options & SO_NBIO)
3685168Swnj 			rcverr(EWOULDBLOCK);
3694890Swnj 		sbunlock(&so->so_rcv);
3704971Swnj 		sbwait(&so->so_rcv);
3715012Swnj 		splx(s);
3724890Swnj 		goto restart;
3734786Swnj 	}
3744829Swnj 	m = so->so_rcv.sb_mb;
3754786Swnj 	if (m == 0)
3764786Swnj 		panic("receive");
3775039Swnj 	if (so->so_proto->pr_flags & PR_ADDR) {
3785039Swnj 		if (m->m_len != sizeof (struct sockaddr))
3795039Swnj 			panic("soreceive addr");
3805039Swnj 		if (asa)
3815039Swnj 			bcopy(mtod(m, caddr_t), (caddr_t)asa, sizeof (*asa));
3825039Swnj 		so->so_rcv.sb_cc -= m->m_len;
3835039Swnj 		so->so_rcv.sb_mbcnt -= MSIZE;
3845018Swnj 		m = m_free(m);
3854890Swnj 		if (m == 0)
3864890Swnj 			panic("receive 2");
3875018Swnj 		so->so_rcv.sb_mb = m;
3884890Swnj 	}
3894786Swnj 	eor = 0;
3904786Swnj 	do {
3914786Swnj 		len = MIN(m->m_len, u.u_count);
3924786Swnj 		if (len == m->m_len) {
3934786Swnj 			eor = (int)m->m_act;
3944890Swnj 			sbfree(&so->so_rcv, m);
3954786Swnj 		}
3964786Swnj 		splx(s);
3974786Swnj 		iomove(mtod(m, caddr_t), len, B_READ);
3984786Swnj 		s = splnet();
3994786Swnj 		if (len == m->m_len) {
4004786Swnj 			MFREE(m, n);
4015012Swnj 			so->so_rcv.sb_mb = n;
4024786Swnj 		} else {
4034786Swnj 			m->m_off += len;
4044786Swnj 			m->m_len -= len;
4054829Swnj 			so->so_rcv.sb_cc -= len;
4064786Swnj 		}
4074829Swnj 	} while ((m = so->so_rcv.sb_mb) && u.u_count && !eor);
4084786Swnj 	if ((so->so_proto->pr_flags & PR_ATOMIC) && eor == 0)
4094786Swnj 		do {
4104786Swnj 			if (m == 0)
4114890Swnj 				panic("receive 3");
4124890Swnj 			sbfree(&so->so_rcv, m);
4134786Swnj 			eor = (int)m->m_act;
4144786Swnj 			so->so_rcv.sb_mb = m->m_next;
4154786Swnj 			MFREE(m, n);
4164890Swnj 			m = n;
4174786Swnj 		} while (eor == 0);
4184890Swnj 	if ((so->so_proto->pr_flags & PR_WANTRCVD) && so->so_pcb)
4194890Swnj 		(*so->so_proto->pr_usrreq)(so, PRU_RCVD, 0, 0);
4204890Swnj release:
4214916Swnj 	sbunlock(&so->so_rcv);
4224890Swnj 	splx(s);
4234916Swnj 	return (error);
4244786Swnj }
4254786Swnj 
4264916Swnj /*ARGSUSED*/
4274916Swnj soioctl(so, cmd, cmdp)
4284829Swnj 	register struct socket *so;
4294829Swnj 	int cmd;
4304829Swnj 	register caddr_t cmdp;
4314786Swnj {
4324786Swnj 
4334927Swnj COUNT(SOIOCTL);
4344829Swnj 	switch (cmdp) {
4354829Swnj 
436*5281Sroot 	case SIOCDONE: {
437*5281Sroot 		int flags;
438*5281Sroot 		if (copyin(cmdp, (caddr_t)&flags, sizeof (flags))) {
439*5281Sroot 			u.u_error = EFAULT;
440*5281Sroot 			return;
441*5281Sroot 		}
442*5281Sroot 		if (flags & FREAD) {
443*5281Sroot 			int s = splimp();
444*5281Sroot 			socantrcvmore(so);
445*5281Sroot 			sbflush(&so->so_rcv);
446*5281Sroot 		}
447*5281Sroot 		if (flags & FWRITE)
448*5281Sroot 			(*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, (struct mbuf *)0, 0);
449*5281Sroot 		return;
4504829Swnj 	}
451*5281Sroot 
452*5281Sroot 	}
4534829Swnj 	switch (so->so_type) {
4544829Swnj 
4554829Swnj 	case SOCK_STREAM:
4564829Swnj 		break;
4574829Swnj 
4584829Swnj 	case SOCK_DGRAM:
4594829Swnj 		break;
4604829Swnj 
4614829Swnj 	case SOCK_RDM:
4624829Swnj 		break;
4634829Swnj 
4644829Swnj 	case SOCK_RAW:
4654829Swnj 		break;
4664829Swnj 
4674829Swnj 	}
4684786Swnj }
469