xref: /csrg-svn/sys/kern/uipc_socket.c (revision 4971)
1*4971Swnj /*	uipc_socket.c	4.8	81/11/20	*/
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"
164829Swnj #include "../net/inet.h"
174829Swnj #include "../net/inet_systm.h"
184786Swnj 
194786Swnj /*
204890Swnj  * Socket support routines.
214890Swnj  *
224890Swnj  * DEAL WITH INTERRUPT NOTIFICATION.
234786Swnj  */
244786Swnj 
254786Swnj /*
264786Swnj  * Create a socket.
274786Swnj  */
284927Swnj socreate(aso, type, asp, asa, options)
294786Swnj 	struct socket **aso;
304786Swnj 	int type;
314927Swnj 	struct sockproto *asp;
324927Swnj 	struct sockaddr *asa;
334829Swnj 	int options;
344786Swnj {
354786Swnj 	register struct protosw *prp;
364786Swnj 	register struct socket *so;
374786Swnj 	struct mbuf *m;
384890Swnj 	int pf, proto, error;
394927Swnj COUNT(SOCREATE);
404786Swnj 
414786Swnj 	/*
424890Swnj 	 * Use process standard protocol/protocol family if none
434890Swnj 	 * specified by address argument.
444786Swnj 	 */
454927Swnj 	if (asp == 0) {
464890Swnj 		pf = PF_INET;		/* should be u.u_protof */
474786Swnj 		proto = 0;
484786Swnj 	} else {
494927Swnj 		pf = asp->sp_family;
504927Swnj 		proto = asp->sp_protocol;
514786Swnj 	}
524786Swnj 
534786Swnj 	/*
544890Swnj 	 * If protocol specified, look for it, otherwise
554890Swnj 	 * for a protocol of the correct type in the right family.
564890Swnj 	 */
574890Swnj 	if (proto)
584890Swnj 		prp = pffindproto(pf, proto);
594890Swnj 	else
604890Swnj 		prp = pffindtype(pf, type);
614890Swnj 	if (prp == 0)
624890Swnj 		return (EPROTONOSUPPORT);
634890Swnj 
644890Swnj 	/*
654786Swnj 	 * Get a socket structure.
664786Swnj 	 */
674890Swnj 	m = m_getclr(M_WAIT);
684786Swnj 	if (m == 0)
694786Swnj 		return (ENOBUFS);
704786Swnj 	so = mtod(m, struct socket *);
714829Swnj 	so->so_options = options;
724786Swnj 
734786Swnj 	/*
744890Swnj 	 * Attach protocol to socket, initializing
754890Swnj 	 * and reserving resources.
764786Swnj 	 */
774786Swnj 	so->so_proto = prp;
784927Swnj 	(*prp->pr_usrreq)(so, PRU_ATTACH, 0, asa);
794786Swnj 	if (so->so_error) {
804890Swnj 		error = so->so_error;
81*4971Swnj 		(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);
97*4971Swnj 	(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 		}
1214890Swnj 		if ((so->so_state & SS_ISDISCONNECTING) &&
1224890Swnj 		    (so->so_options & SO_NBIO)) {
1234890Swnj 			u.u_error = EINPROGRESS;
1244890Swnj 			splx(s);
1254890Swnj 			return;
1264890Swnj 		}
1274890Swnj 		while (so->so_state & SS_ISCONNECTED)
1284890Swnj 			sleep((caddr_t)&so->so_timeo, PZERO+1);
1294890Swnj 	}
1304890Swnj 	u.u_error = (*so->so_proto->pr_usrreq)(so, PRU_DETACH, 0, 0);
1314890Swnj discard:
1324950Swnj 	so->so_state |= SS_USERGONE;
1334950Swnj 	sofree(so);
1344890Swnj 	splx(s);
1354829Swnj }
1364829Swnj 
1374927Swnj sosplice(pso, so)
1384927Swnj 	struct socket *pso, *so;
1394927Swnj {
1404927Swnj 
1414927Swnj COUNT(SOSPLICE);
1424927Swnj 	if (pso->so_proto->pr_family != PF_LOCAL) {
1434927Swnj 		struct socket *tso;
1444927Swnj 		tso = pso; pso = so; so = tso;
1454927Swnj 	}
1464927Swnj 	if (pso->so_proto->pr_family != PF_LOCAL)
1474927Swnj 		return (EOPNOTSUPP);
1484927Swnj 	/* check types and buffer space */
1494927Swnj 	/* merge buffers */
1504927Swnj 	return (0);
1514927Swnj }
1524927Swnj 
1534916Swnj /*ARGSUSED*/
1544890Swnj sostat(so, sb)
1554829Swnj 	struct socket *so;
1564890Swnj 	struct stat *sb;
1574829Swnj {
1584829Swnj 
1594927Swnj COUNT(SOSTAT);
1604890Swnj 	return (EOPNOTSUPP);
1614829Swnj }
1624829Swnj 
1634829Swnj /*
1644927Swnj  * Accept connection on a socket.
1654927Swnj  */
1664927Swnj soaccept(so, asa)
1674927Swnj 	struct socket *so;
1684927Swnj 	struct sockaddr *asa;
1694927Swnj {
1704927Swnj 	int s = splnet();
1714927Swnj 	int error;
1724927Swnj 
1734927Swnj COUNT(SOACCEPT);
1744927Swnj 	if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) {
1754927Swnj 		error = EISCONN;
1764927Swnj 		goto bad;
1774927Swnj 	}
1784927Swnj 	if ((so->so_options & SO_ACCEPTCONN) == 0) {
1794927Swnj 		error = EINVAL;			/* XXX */
1804927Swnj 		goto bad;
1814927Swnj 	}
1824927Swnj 	error = (*so->so_proto->pr_usrreq)(so, PRU_ACCEPT, 0, (caddr_t)asa);
1834927Swnj bad:
1844927Swnj 	splx(s);
1854927Swnj 	return (error);
1864927Swnj }
1874927Swnj 
1884927Swnj /*
1894890Swnj  * Connect socket to a specified address.
1904890Swnj  * If already connected or connecting, then avoid
1914890Swnj  * the protocol entry, to keep its job simpler.
1924786Swnj  */
1934927Swnj soconnect(so, asa)
1944786Swnj 	struct socket *so;
1954927Swnj 	struct sockaddr *asa;
1964786Swnj {
1974890Swnj 	int s = splnet();
1984890Swnj 	int error;
1994786Swnj 
2004927Swnj COUNT(SOCONNECT);
2014890Swnj 	if (so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) {
2024890Swnj 		error = EISCONN;
2034890Swnj 		goto bad;
2044890Swnj 	}
2054927Swnj 	error = (*so->so_proto->pr_usrreq)(so, PRU_CONNECT, 0, (caddr_t)asa);
2064890Swnj bad:
2074890Swnj 	splx(s);
2084890Swnj 	return (error);
2094786Swnj }
2104786Swnj 
2114786Swnj /*
2124890Swnj  * Disconnect from a socket.
2134890Swnj  * Address parameter is from system call for later multicast
2144890Swnj  * protocols.  Check to make sure that connected and no disconnect
2154890Swnj  * in progress (for protocol's sake), and then invoke protocol.
2164786Swnj  */
2174927Swnj sodisconnect(so, asa)
2184786Swnj 	struct socket *so;
2194927Swnj 	struct sockaddr *asa;
2204786Swnj {
2214890Swnj 	int s = splnet();
2224890Swnj 	int error;
2234786Swnj 
2244927Swnj COUNT(SODISCONNECT);
2254890Swnj 	if ((so->so_state & SS_ISCONNECTED) == 0) {
2264890Swnj 		error = ENOTCONN;
2274890Swnj 		goto bad;
2284890Swnj 	}
2294890Swnj 	if (so->so_state & SS_ISDISCONNECTING) {
2304890Swnj 		error = EALREADY;
2314890Swnj 		goto bad;
2324890Swnj 	}
2334927Swnj 	error = (*so->so_proto->pr_usrreq)(so, PRU_DISCONNECT, 0, asa);
2344890Swnj bad:
2354890Swnj 	splx(s);
2364890Swnj 	return (error);
2374786Swnj }
2384786Swnj 
2394786Swnj /*
2404890Swnj  * Send on a socket.
2414890Swnj  * If send must go all at once and message is larger than
2424890Swnj  * send buffering, then hard error.
2434890Swnj  * Lock against other senders.
2444890Swnj  * If must go all at once and not enough room now, then
2454890Swnj  * inform user that this would block and do nothing.
2464786Swnj  */
2474927Swnj sosend(so, asa)
2484786Swnj 	register struct socket *so;
2494927Swnj 	struct sockaddr *asa;
2504786Swnj {
2514890Swnj 	struct mbuf *top = 0;
2524890Swnj 	register struct mbuf *m, **mp = ⊤
2534916Swnj 	register u_int len;
2544916Swnj 	int error = 0, space, s;
2554786Swnj 
2564927Swnj COUNT(SOSEND);
2574890Swnj 	if (so->so_state & SS_CANTSENDMORE)
2584890Swnj 		return (EPIPE);
2594890Swnj 	if (sosendallatonce(so) && u.u_count > so->so_snd.sb_hiwat)
2604890Swnj 		return (EMSGSIZE);
2614890Swnj 	if ((so->so_snd.sb_flags & SB_LOCK) && (so->so_options & SO_NBIO))
2624890Swnj 		return (EWOULDBLOCK);
2634890Swnj 	sblock(&so->so_snd);
2644890Swnj #define	snderr(errno)	{ error = errno; splx(s); goto release; }
2654890Swnj 
2664890Swnj 	s = splnet();
2674890Swnj again:
2684890Swnj 	if ((so->so_state & SS_ISCONNECTED) == 0) {
2694890Swnj 		if (so->so_proto->pr_flags & PR_CONNREQUIRED)
2704890Swnj 			snderr(ENOTCONN);
2714927Swnj 		if (asa == 0)
2724890Swnj 			snderr(EDESTADDRREQ);
2734890Swnj 	}
2744890Swnj 	if (so->so_error)
2754890Swnj 		snderr(so->so_error);
2764890Swnj 	if (top) {
2774927Swnj 		error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, top, asa);
2784890Swnj 		if (error) {
2794890Swnj 			splx(s);
2804786Swnj 			goto release;
2814786Swnj 		}
2824890Swnj 		top = 0;
2834890Swnj 		mp = ⊤
2844786Swnj 	}
2854890Swnj 	if (sosendallatonce(so) && sbspace(&so->so_snd) < u.u_count) {
2864890Swnj 		if (so->so_options & SO_NBIO)
2874890Swnj 			snderr(EWOULDBLOCK);
2884890Swnj 		sbunlock(&so->so_snd);
2894890Swnj 		sbwait(&so->so_snd);
2904890Swnj 		splx(s);
2914786Swnj 		goto again;
2924786Swnj 	}
2934890Swnj 	splx(s);
2944916Swnj 	while (u.u_count && (space = sbspace(&so->so_snd)) > 0) {
2954890Swnj 		MGET(m, 1);
2964890Swnj 		if (m == NULL) {
2974890Swnj 			error = ENOBUFS;
2984890Swnj 			m_freem(top);
2994890Swnj 			goto release;
3004786Swnj 		}
3014916Swnj 		if (u.u_count >= PGSIZE && space >= NMBPG) {
3024890Swnj 			register struct mbuf *p;
3034890Swnj 			MPGET(p, 1);
3044890Swnj 			if (p == 0)
3054890Swnj 				goto nopages;
3064890Swnj 			m->m_off = (int)p - (int)m;
3074890Swnj 			len = PGSIZE;
3084890Swnj 		} else {
3094786Swnj nopages:
3104890Swnj 			m->m_off = MMINOFF;
3114890Swnj 			len = MIN(MLEN, u.u_count);
3124786Swnj 		}
3134890Swnj 		iomove(mtod(m, caddr_t), len, B_WRITE);
3144890Swnj 		m->m_len = len;
3154890Swnj 		*mp = m;
3164890Swnj 		mp = &m->m_next;
3174786Swnj 	}
3184890Swnj 	s = splnet();
3194890Swnj 	goto again;
3204890Swnj 
3214786Swnj release:
3224890Swnj 	sbunlock(&so->so_snd);
3234786Swnj 	return (error);
3244786Swnj }
3254786Swnj 
3264927Swnj soreceive(so, asa)
3274786Swnj 	register struct socket *so;
3284927Swnj 	struct sockaddr *asa;
3294786Swnj {
3304786Swnj 	register struct mbuf *m, *n;
3314916Swnj 	u_int len;
3324890Swnj 	int eor, s, error = 0;
3334786Swnj 
3344927Swnj COUNT(SORECEIVE);
3354890Swnj restart:
3364890Swnj 	sblock(&so->so_rcv);
3374890Swnj 	s = splnet();
3384890Swnj 
3394890Swnj #define	rcverr(errno)	{ error = errno; splx(s); goto release; }
3404786Swnj 	if (so->so_rcv.sb_cc == 0) {
3414890Swnj 		if ((so->so_state & SS_ISCONNECTED) == 0 &&
3424890Swnj 		    (so->so_proto->pr_flags & PR_CONNREQUIRED))
3434890Swnj 			rcverr(ENOTCONN);
3444890Swnj 		if (so->so_state & SS_CANTRCVMORE) {
3454890Swnj 			splx(s);
3464890Swnj 			goto release;
3474890Swnj 		}
3484890Swnj 		if (so->so_options & SO_NBIO)
3494916Swnj 			rcverr (EWOULDBLOCK);
3504890Swnj 		sbunlock(&so->so_rcv);
351*4971Swnj 		sbwait(&so->so_rcv);
3524890Swnj 		goto restart;
3534786Swnj 	}
3544829Swnj 	m = so->so_rcv.sb_mb;
3554786Swnj 	if (m == 0)
3564786Swnj 		panic("receive");
3574890Swnj 	if ((so->so_proto->pr_flags & PR_ADDR)) {
3584890Swnj 		so->so_rcv.sb_mb = m->m_next;
3594927Swnj 		if (asa) {
3604890Swnj 			so->so_rcv.sb_cc -= m->m_len;
3614927Swnj 			len = MIN(m->m_len, sizeof (struct sockaddr));
3624927Swnj 			bcopy(mtod(m, caddr_t), (caddr_t)asa, len);
3634890Swnj 		} else
3644927Swnj 			bzero((caddr_t)asa, sizeof (*asa));
3654890Swnj 		m = so->so_rcv.sb_mb;
3664890Swnj 		if (m == 0)
3674890Swnj 			panic("receive 2");
3684890Swnj 	}
3694786Swnj 	eor = 0;
3704786Swnj 	do {
3714786Swnj 		len = MIN(m->m_len, u.u_count);
3724786Swnj 		if (len == m->m_len) {
3734786Swnj 			eor = (int)m->m_act;
3744890Swnj 			sbfree(&so->so_rcv, m);
3754786Swnj 		}
3764786Swnj 		splx(s);
3774786Swnj 		iomove(mtod(m, caddr_t), len, B_READ);
3784786Swnj 		s = splnet();
3794786Swnj 		if (len == m->m_len) {
3804786Swnj 			MFREE(m, n);
3814786Swnj 		} else {
3824786Swnj 			m->m_off += len;
3834786Swnj 			m->m_len -= len;
3844829Swnj 			so->so_rcv.sb_cc -= len;
3854786Swnj 		}
3864829Swnj 	} while ((m = so->so_rcv.sb_mb) && u.u_count && !eor);
3874786Swnj 	if ((so->so_proto->pr_flags & PR_ATOMIC) && eor == 0)
3884786Swnj 		do {
3894786Swnj 			if (m == 0)
3904890Swnj 				panic("receive 3");
3914890Swnj 			sbfree(&so->so_rcv, m);
3924786Swnj 			eor = (int)m->m_act;
3934786Swnj 			so->so_rcv.sb_mb = m->m_next;
3944786Swnj 			MFREE(m, n);
3954890Swnj 			m = n;
3964786Swnj 		} while (eor == 0);
3974890Swnj 	if ((so->so_proto->pr_flags & PR_WANTRCVD) && so->so_pcb)
3984890Swnj 		(*so->so_proto->pr_usrreq)(so, PRU_RCVD, 0, 0);
3994890Swnj release:
4004916Swnj 	sbunlock(&so->so_rcv);
4014890Swnj 	splx(s);
4024916Swnj 	return (error);
4034786Swnj }
4044786Swnj 
4054916Swnj /*ARGSUSED*/
4064916Swnj soioctl(so, cmd, cmdp)
4074829Swnj 	register struct socket *so;
4084829Swnj 	int cmd;
4094829Swnj 	register caddr_t cmdp;
4104786Swnj {
4114786Swnj 
4124927Swnj COUNT(SOIOCTL);
4134829Swnj 	switch (cmdp) {
4144829Swnj 
4154829Swnj 	}
4164829Swnj 	switch (so->so_type) {
4174829Swnj 
4184829Swnj 	case SOCK_STREAM:
4194829Swnj 		break;
4204829Swnj 
4214829Swnj 	case SOCK_DGRAM:
4224829Swnj 		break;
4234829Swnj 
4244829Swnj 	case SOCK_RDM:
4254829Swnj 		break;
4264829Swnj 
4274829Swnj 	case SOCK_RAW:
4284829Swnj 		break;
4294829Swnj 
4304829Swnj 	}
4314786Swnj }
432