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sockin.c revision 1.20 
      1 /*	$NetBSD: sockin.c,v 1.20 2009/10/20 12:17:44 tron Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2008, 2009 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: sockin.c,v 1.20 2009/10/20 12:17:44 tron Exp $");
     30 
     31 #include <sys/param.h>
     32 #include <sys/condvar.h>
     33 #include <sys/domain.h>
     34 #include <sys/kmem.h>
     35 #include <sys/kthread.h>
     36 #include <sys/mbuf.h>
     37 #include <sys/mutex.h>
     38 #include <sys/poll.h>
     39 #include <sys/protosw.h>
     40 #include <sys/queue.h>
     41 #include <sys/socket.h>
     42 #include <sys/socketvar.h>
     43 #include <sys/time.h>
     44 
     45 #include <net/radix.h>
     46 
     47 #include <netinet/in.h>
     48 #include <netinet/in_systm.h>
     49 #include <netinet/ip.h>
     50 
     51 #include <rump/rumpuser.h>
     52 
     53 #include "rump_private.h"
     54 
     55 /*
     56  * An inet communication domain which uses the socket interface.
     57  * Currently supports only IPv4 UDP, but could easily be extended to
     58  * support IPv6 and TCP by adding more stuff to the protosw.
     59  */
     60 
     61 DOMAIN_DEFINE(sockindomain);
     62 
     63 static void	sockin_init(void);
     64 static int	sockin_usrreq(struct socket *, int, struct mbuf *,
     65 			      struct mbuf *, struct mbuf *, struct lwp *);
     66 static int	sockin_ctloutput(int op, struct socket *, struct sockopt *);
     67 
     68 const struct protosw sockinsw[] = {
     69 {
     70 	.pr_type = SOCK_DGRAM,
     71 	.pr_domain = &sockindomain,
     72 	.pr_protocol = IPPROTO_UDP,
     73 	.pr_flags = PR_ATOMIC|PR_ADDR,
     74 	.pr_usrreq = sockin_usrreq,
     75 	.pr_ctloutput = sockin_ctloutput,
     76 },
     77 {
     78 	.pr_type = SOCK_STREAM,
     79 	.pr_domain = &sockindomain,
     80 	.pr_protocol = IPPROTO_TCP,
     81 	.pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS,
     82 	.pr_usrreq = sockin_usrreq,
     83 	.pr_ctloutput = sockin_ctloutput,
     84 }};
     85 
     86 struct domain sockindomain = {
     87 	.dom_family = PF_INET,
     88 	.dom_name = "socket_inet",
     89 	.dom_init = sockin_init,
     90 	.dom_externalize = NULL,
     91 	.dom_dispose = NULL,
     92 	.dom_protosw = sockinsw,
     93 	.dom_protoswNPROTOSW = &sockinsw[__arraycount(sockinsw)],
     94 	.dom_rtattach = rn_inithead,
     95 	.dom_rtoffset = 32,
     96 	.dom_maxrtkey = sizeof(struct sockaddr_in),
     97 	.dom_ifattach = NULL,
     98 	.dom_ifdetach = NULL,
     99 	.dom_ifqueues = { NULL },
    100 	.dom_link = { NULL },
    101 	.dom_mowner = MOWNER_INIT("",""),
    102 	.dom_rtcache = { NULL },
    103 	.dom_sockaddr_cmp = NULL
    104 };
    105 
    106 #define SO2S(so) ((intptr_t)(so->so_internal))
    107 #define SOCKIN_SBSIZE 65536
    108 
    109 struct sockin_unit {
    110 	struct socket *su_so;
    111 
    112 	LIST_ENTRY(sockin_unit) su_entries;
    113 };
    114 static LIST_HEAD(, sockin_unit) su_ent = LIST_HEAD_INITIALIZER(su_ent);
    115 static kmutex_t su_mtx;
    116 static bool rebuild;
    117 static int nsock;
    118 
    119 static int
    120 registersock(struct socket *so, int news)
    121 {
    122 	struct sockin_unit *su;
    123 
    124 	su = kmem_alloc(sizeof(*su), KM_NOSLEEP);
    125 	if (!su)
    126 		return ENOMEM;
    127 
    128 	so->so_internal = (void *)(intptr_t)news;
    129 	su->su_so = so;
    130 
    131 	mutex_enter(&su_mtx);
    132 	LIST_INSERT_HEAD(&su_ent, su, su_entries);
    133 	nsock++;
    134 	rebuild = true;
    135 	mutex_exit(&su_mtx);
    136 
    137 	return 0;
    138 }
    139 
    140 static void
    141 removesock(struct socket *so)
    142 {
    143 	struct sockin_unit *su_iter;
    144 	int error;
    145 
    146 	mutex_enter(&su_mtx);
    147 	LIST_FOREACH(su_iter, &su_ent, su_entries) {
    148 		if (su_iter->su_so == so)
    149 			break;
    150 	}
    151 	if (!su_iter)
    152 		panic("no such socket");
    153 
    154 	LIST_REMOVE(su_iter, su_entries);
    155 	nsock--;
    156 	rebuild = true;
    157 	mutex_exit(&su_mtx);
    158 
    159 	rumpuser_close(SO2S(su_iter->su_so), &error);
    160 	kmem_free(su_iter, sizeof(*su_iter));
    161 }
    162 
    163 static void
    164 sockin_process(struct socket *so)
    165 {
    166 	struct sockaddr_in from;
    167 	struct iovec io;
    168 	struct msghdr rmsg;
    169 	struct mbuf *m;
    170 	ssize_t n;
    171 	size_t plen;
    172 	int error;
    173 
    174 	m = m_gethdr(M_WAIT, MT_DATA);
    175 	if (so->so_proto->pr_type == SOCK_DGRAM) {
    176 		plen = IP_MAXPACKET;
    177 		MEXTMALLOC(m, plen, M_DONTWAIT);
    178 	} else {
    179 		plen = MCLBYTES;
    180 		MCLGET(m, M_DONTWAIT);
    181 	}
    182 	if ((m->m_flags & M_EXT) == 0) {
    183 		m_freem(m);
    184 		return;
    185 	}
    186 
    187 	memset(&rmsg, 0, sizeof(rmsg));
    188 	io.iov_base = mtod(m, void *);
    189 	io.iov_len = plen;
    190 	rmsg.msg_iov = &io;
    191 	rmsg.msg_iovlen = 1;
    192 	rmsg.msg_name = (struct sockaddr *)&from;
    193 	rmsg.msg_namelen = sizeof(from);
    194 
    195 	n = rumpuser_net_recvmsg(SO2S(so), &rmsg, 0, &error);
    196 	if (n <= 0) {
    197 		m_freem(m);
    198 
    199 		/* Treat a TCP socket a goner */
    200 		if (error != EAGAIN && so->so_proto->pr_type == SOCK_STREAM) {
    201 			mutex_enter(softnet_lock);
    202 			soisdisconnected(so);
    203 			mutex_exit(softnet_lock);
    204 			removesock(so);
    205 		}
    206 		return;
    207 	}
    208 	m->m_len = m->m_pkthdr.len = n;
    209 
    210 	mutex_enter(softnet_lock);
    211 	if (so->so_proto->pr_type == SOCK_DGRAM) {
    212 		if (!sbappendaddr(&so->so_rcv, rmsg.msg_name, m, NULL)) {
    213 			m_freem(m);
    214 		}
    215 	} else {
    216 		sbappendstream(&so->so_rcv, m);
    217 	}
    218 
    219 	sorwakeup(so);
    220 	mutex_exit(softnet_lock);
    221 }
    222 
    223 static void
    224 sockin_accept(struct socket *so)
    225 {
    226 	struct socket *nso;
    227 	struct sockaddr_in sin;
    228 	int news, error, slen;
    229 
    230 	slen = sizeof(sin);
    231 	news = rumpuser_net_accept(SO2S(so), (struct sockaddr *)&sin,
    232 	    &slen, &error);
    233 	if (news == -1)
    234 		return;
    235 
    236 	mutex_enter(softnet_lock);
    237 	nso = sonewconn(so, SS_ISCONNECTED);
    238 	if (nso == NULL)
    239 		goto errout;
    240 	if (registersock(nso, news) != 0)
    241 		goto errout;
    242 	mutex_exit(softnet_lock);
    243 	return;
    244 
    245  errout:
    246 	rumpuser_close(news, &error);
    247 	if (nso)
    248 		soclose(nso);
    249 	mutex_exit(softnet_lock);
    250 }
    251 
    252 #define POLLTIMEOUT 100	/* check for new entries every 100ms */
    253 
    254 /* XXX: doesn't handle socket (kernel) locking properly? */
    255 static void
    256 sockinworker(void *arg)
    257 {
    258 	struct pollfd *pfds = NULL, *npfds;
    259 	struct sockin_unit *su_iter;
    260 	struct socket *so;
    261 	int cursock = 0, i, rv, error;
    262 
    263 	/*
    264 	 * Loop reading requests.  Check for new sockets periodically
    265 	 * (could be smarter, but I'm lazy).
    266 	 */
    267 	for (;;) {
    268 		if (rebuild) {
    269 			npfds = NULL;
    270 			mutex_enter(&su_mtx);
    271 			if (nsock)
    272 				npfds = kmem_alloc(nsock * sizeof(*npfds),
    273 				    KM_NOSLEEP);
    274 			if (npfds || nsock == 0) {
    275 				if (pfds)
    276 					kmem_free(pfds, cursock*sizeof(*pfds));
    277 				pfds = npfds;
    278 				cursock = nsock;
    279 				rebuild = false;
    280 
    281 				i = 0;
    282 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    283 					pfds[i].fd = SO2S(su_iter->su_so);
    284 					pfds[i].events = POLLIN;
    285 					pfds[i].revents = 0;
    286 					i++;
    287 				}
    288 				KASSERT(i == nsock);
    289 			}
    290 			mutex_exit(&su_mtx);
    291 		}
    292 
    293 		/* find affected sockets & process */
    294 		rv = rumpuser_poll(pfds, cursock, POLLTIMEOUT, &error);
    295 		for (i = 0; i < cursock && rv > 0; i++) {
    296 			if (pfds[i].revents & POLLIN) {
    297 				mutex_enter(&su_mtx);
    298 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    299 					if (SO2S(su_iter->su_so)==pfds[i].fd) {
    300 						so = su_iter->su_so;
    301 						mutex_exit(&su_mtx);
    302 						if(so->so_options&SO_ACCEPTCONN)
    303 							sockin_accept(so);
    304 						else
    305 							sockin_process(so);
    306 						mutex_enter(&su_mtx);
    307 						break;
    308 					}
    309 				}
    310 				/* if we can't find it, just wing it */
    311 				KASSERT(rebuild || su_iter);
    312 				mutex_exit(&su_mtx);
    313 				pfds[i].revents = 0;
    314 				rv--;
    315 				i = -1;
    316 				continue;
    317 			}
    318 
    319 			/* something else?  ignore */
    320 			if (pfds[i].revents) {
    321 				pfds[i].revents = 0;
    322 				rv--;
    323 			}
    324 		}
    325 		KASSERT(rv <= 0);
    326 	}
    327 
    328 }
    329 
    330 static void
    331 sockin_init(void)
    332 {
    333 	int rv;
    334 
    335 	if (rump_threads) {
    336 		if ((rv = kthread_create(PRI_NONE, 0, NULL, sockinworker,
    337 		    NULL, NULL, "sockwork")) != 0)
    338 			panic("sockin_init: could not create worker thread\n");
    339 	} else {
    340 		printf("sockin_init: no threads => no worker thread\n");
    341 	}
    342 	mutex_init(&su_mtx, MUTEX_DEFAULT, IPL_NONE);
    343 }
    344 
    345 static int
    346 sockin_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
    347 	struct mbuf *control, struct lwp *l)
    348 {
    349 	int error = 0, rv;
    350 
    351 	switch (req) {
    352 	case PRU_ATTACH:
    353 	{
    354 		int news, dummy;
    355 		int sbsize;
    356 
    357 		sosetlock(so);
    358 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    359 			error = soreserve(so, SOCKIN_SBSIZE, SOCKIN_SBSIZE);
    360 			if (error)
    361 				break;
    362 		}
    363 
    364 		news = rumpuser_net_socket(PF_INET, so->so_proto->pr_type,
    365 		    0, &error);
    366 		if (news == -1)
    367 			break;
    368 
    369 		/* for UDP sockets, make sure we can send&recv max */
    370 		if (so->so_proto->pr_type == SOCK_DGRAM) {
    371 			sbsize = SOCKIN_SBSIZE;
    372 			rumpuser_net_setsockopt(news, SOL_SOCKET, SO_SNDBUF,
    373 			    &sbsize, sizeof(sbsize), &error);
    374 			sbsize = SOCKIN_SBSIZE;
    375 			rumpuser_net_setsockopt(news, SOL_SOCKET, SO_RCVBUF,
    376 			    &sbsize, sizeof(sbsize), &error);
    377 		}
    378 
    379 		if ((error = registersock(so, news)) != 0)
    380 			rumpuser_close(news, &dummy);
    381 
    382 		break;
    383 	}
    384 
    385 	case PRU_ACCEPT:
    386 		/* we do all the work in the worker thread */
    387 		break;
    388 
    389 	case PRU_BIND:
    390 		rumpuser_net_bind(SO2S(so), mtod(nam, const struct sockaddr *),
    391 		    sizeof(struct sockaddr_in), &error);
    392 		break;
    393 
    394 	case PRU_CONNECT:
    395 		rv = rumpuser_net_connect(SO2S(so),
    396 		    mtod(nam, struct sockaddr *), sizeof(struct sockaddr_in),
    397 		    &error);
    398 		if (rv == 0)
    399 			soisconnected(so);
    400 		break;
    401 
    402 	case PRU_LISTEN:
    403 		rumpuser_net_listen(SO2S(so), so->so_qlimit, &error);
    404 		break;
    405 
    406 	case PRU_SEND:
    407 	{
    408 		struct sockaddr *saddr;
    409 		struct msghdr mhdr;
    410 		size_t iov_max, i;
    411 		struct iovec iov_buf[32], *iov;
    412 		struct mbuf *m2;
    413 		size_t tot;
    414 		int s;
    415 
    416 		memset(&mhdr, 0, sizeof(mhdr));
    417 
    418 		iov_max = 0;
    419 		for (m2 = m; m2 != NULL; m2 = m2->m_next) {
    420 			iov_max++;
    421 		}
    422 
    423 		if (iov_max <= __arraycount(iov_buf)) {
    424 			iov = iov_buf;
    425 		} else {
    426 			iov = kmem_alloc(sizeof(struct iovec) * iov_max,
    427 			    KM_SLEEP);
    428 		}
    429 
    430 		tot = 0;
    431 		for (i = 0, m2 = m; m2 != NULL; m2 = m2->m_next, i++) {
    432 			iov[i].iov_base = m2->m_data;
    433 			iov[i].iov_len = m2->m_len;
    434 			tot += m2->m_len;
    435 		}
    436 		mhdr.msg_iov = iov;
    437 		mhdr.msg_iovlen = i;
    438 		s = SO2S(so);
    439 
    440 		if (nam != NULL) {
    441 			saddr = mtod(nam, struct sockaddr *);
    442 			mhdr.msg_name = saddr;
    443 			mhdr.msg_namelen = saddr->sa_len;
    444 		}
    445 
    446 		rumpuser_net_sendmsg(s, &mhdr, 0, &error);
    447 
    448 		if (iov != iov_buf)
    449 			kmem_free(iov, sizeof(struct iovec) * iov_max);
    450 
    451 		m_freem(m);
    452 		m_freem(control);
    453 
    454 		/* this assumes too many things to list.. buthey, testing */
    455 		if (!rump_threads)
    456 			sockin_process(so);
    457 	}
    458 		break;
    459 
    460 	case PRU_SHUTDOWN:
    461 		removesock(so);
    462 		break;
    463 
    464 	case PRU_SOCKADDR:
    465 	case PRU_PEERADDR:
    466 	{
    467 		int slen = nam->m_len;
    468 		enum rumpuser_getnametype which;
    469 
    470 		if (req == PRU_SOCKADDR)
    471 			which = RUMPUSER_SOCKNAME;
    472 		else
    473 			which = RUMPUSER_PEERNAME;
    474 		rumpuser_net_getname(SO2S(so),
    475 		    mtod(nam, struct sockaddr *), &slen, which, &error);
    476 		if (error == 0)
    477 			nam->m_len = slen;
    478 		break;
    479 	}
    480 
    481 	default:
    482 		panic("sockin_usrreq: IMPLEMENT ME, req %d not supported", req);
    483 	}
    484 
    485 	return error;
    486 }
    487 
    488 static int
    489 sockin_ctloutput(int op, struct socket *so, struct sockopt *sopt)
    490 {
    491 	int error;
    492 
    493 	rumpuser_net_setsockopt(SO2S(so), sopt->sopt_level,
    494 	    sopt->sopt_name, sopt->sopt_data, sopt->sopt_size, &error);
    495 	return error;
    496 }
    497