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sockin.c revision 1.6 
      1 /*	$NetBSD: sockin.c,v 1.6 2008/11/25 20:42:01 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2008 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/param.h>
     29 #include <sys/condvar.h>
     30 #include <sys/domain.h>
     31 #include <sys/kmem.h>
     32 #include <sys/kthread.h>
     33 #include <sys/mbuf.h>
     34 #include <sys/mutex.h>
     35 #include <sys/poll.h>
     36 #include <sys/protosw.h>
     37 #include <sys/queue.h>
     38 #include <sys/socket.h>
     39 #include <sys/socketvar.h>
     40 #include <sys/time.h>
     41 
     42 #include <net/radix.h>
     43 
     44 #include <netinet/in.h>
     45 #include <netinet/in_systm.h>
     46 #include <netinet/ip.h>
     47 
     48 #include <rump/rumpuser.h>
     49 
     50 /*
     51  * An inet communication domain which uses the socket interface.
     52  * Currently supports only IPv4 UDP, but could easily be extended to
     53  * support IPv6 and TCP by adding more stuff to the protosw.
     54  */
     55 
     56 DOMAIN_DEFINE(sockindomain);
     57 
     58 static void	sockin_init(void);
     59 static int	sockin_usrreq(struct socket *, int, struct mbuf *,
     60 			      struct mbuf *, struct mbuf *, struct lwp *);
     61 
     62 const struct protosw sockinsw[] = {
     63 {
     64 	.pr_type = SOCK_DGRAM,
     65 	.pr_domain = &sockindomain,
     66 	.pr_protocol = IPPROTO_UDP,
     67 	.pr_flags = PR_ATOMIC|PR_ADDR,
     68 	.pr_usrreq = sockin_usrreq,
     69 },
     70 {
     71 	.pr_type = SOCK_STREAM,
     72 	.pr_domain = &sockindomain,
     73 	.pr_protocol = IPPROTO_TCP,
     74 	.pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS,
     75 	.pr_usrreq = sockin_usrreq,
     76 }};
     77 
     78 struct domain sockindomain = {
     79 	.dom_family = PF_INET,
     80 	.dom_name = "socket_inet",
     81 	.dom_init = sockin_init,
     82 	.dom_externalize = NULL,
     83 	.dom_dispose = NULL,
     84 	.dom_protosw = sockinsw,
     85 	.dom_protoswNPROTOSW = &sockinsw[__arraycount(sockinsw)],
     86 	.dom_rtattach = rn_inithead,
     87 	.dom_rtoffset = 32,
     88 	.dom_maxrtkey = sizeof(struct sockaddr_in),
     89 	.dom_ifattach = NULL,
     90 	.dom_ifdetach = NULL,
     91 	.dom_ifqueues = { NULL },
     92 	.dom_link = { NULL },
     93 	.dom_mowner = MOWNER_INIT("",""),
     94 	.dom_rtcache = { NULL },
     95 	.dom_sockaddr_cmp = NULL
     96 };
     97 
     98 /* only for testing */
     99 #if 0
    100 #define SOCKIN_NOTHREAD
    101 #endif
    102 
    103 #define SO2S(so) ((intptr_t)(so->so_internal))
    104 #define SOCKIN_SBSIZE 65536
    105 
    106 struct sockin_unit {
    107 	struct socket *su_so;
    108 
    109 	LIST_ENTRY(sockin_unit) su_entries;
    110 };
    111 static LIST_HEAD(, sockin_unit) su_ent = LIST_HEAD_INITIALIZER(su_ent);
    112 static kmutex_t su_mtx;
    113 static bool rebuild;
    114 static int nsock;
    115 
    116 static int
    117 registersock(struct socket *so, int news)
    118 {
    119 	struct sockin_unit *su;
    120 
    121 	su = kmem_alloc(sizeof(*su), KM_NOSLEEP);
    122 	if (!su)
    123 		return ENOMEM;
    124 
    125 	so->so_internal = (void *)(intptr_t)news;
    126 	su->su_so = so;
    127 
    128 	mutex_enter(&su_mtx);
    129 	LIST_INSERT_HEAD(&su_ent, su, su_entries);
    130 	nsock++;
    131 	rebuild = true;
    132 	mutex_exit(&su_mtx);
    133 
    134 	return 0;
    135 }
    136 
    137 static void
    138 sockin_process(struct socket *so)
    139 {
    140 	struct sockaddr_in from;
    141 	struct iovec io;
    142 	struct msghdr rmsg;
    143 	struct mbuf *m;
    144 	ssize_t n;
    145 	size_t plen;
    146 	int error;
    147 
    148 	plen = IP_MAXPACKET;
    149 	m = m_gethdr(M_WAIT, MT_DATA);
    150 	MEXTMALLOC(m, plen, M_WAIT);
    151 
    152 	memset(&rmsg, 0, sizeof(rmsg));
    153 	io.iov_base = mtod(m, void *);
    154 	io.iov_len = plen;
    155 	rmsg.msg_iov = &io;
    156 	rmsg.msg_iovlen = 1;
    157 	rmsg.msg_name = (struct sockaddr *)&from;
    158 	rmsg.msg_namelen = sizeof(from);
    159 
    160 	n = rumpuser_net_recvmsg(SO2S(so), &rmsg, 0, &error);
    161 	if (n <= 0) {
    162 		m_freem(m);
    163 		return;
    164 	}
    165 	m->m_len = m->m_pkthdr.len = n;
    166 
    167 	if (so->so_proto->pr_type == SOCK_DGRAM) {
    168 		if (!sbappendaddr(&so->so_rcv, rmsg.msg_name, m, NULL)) {
    169 			m_freem(m);
    170 		}
    171 	} else {
    172 		sbappendstream(&so->so_rcv, m);
    173 	}
    174 
    175 	sorwakeup(so);
    176 }
    177 
    178 #ifndef SOCKIN_NOTHREAD
    179 static void
    180 sockin_accept(struct socket *so)
    181 {
    182 	struct socket *nso;
    183 	struct sockaddr_in sin;
    184 	int news, error, slen;
    185 
    186 	slen = sizeof(sin);
    187 	news = rumpuser_net_accept(SO2S(so), (struct sockaddr *)&sin,
    188 	    &slen, &error);
    189 	if (news == -1)
    190 		return;
    191 
    192 	if ((nso = sonewconn(so, SS_ISCONNECTED)) == NULL)
    193 		goto errout;
    194 	if (registersock(nso, news) != 0)
    195 		goto errout;
    196 	return;
    197 
    198  errout:
    199 	rumpuser_close(news, &error);
    200 	if (nso)
    201 		soclose(nso);
    202 }
    203 
    204 #define POLLTIMEOUT 100	/* check for new entries every 100ms */
    205 
    206 /* XXX: doesn't handle socket (kernel) locking properly? */
    207 static void
    208 sockinworker(void *arg)
    209 {
    210 	struct pollfd *pfds = NULL, *npfds;
    211 	struct sockin_unit *su_iter;
    212 	struct socket *so;
    213 	int cursock = 0, i, rv, error;
    214 
    215 	/*
    216 	 * Loop reading requests.  Check for new sockets periodically
    217 	 * (could be smarter, but I'm lazy).
    218 	 */
    219 	for (;;) {
    220 		if (rebuild) {
    221 			npfds = NULL;
    222 			mutex_enter(&su_mtx);
    223 			if (nsock)
    224 				npfds = kmem_alloc(nsock * sizeof(*npfds),
    225 				    KM_NOSLEEP);
    226 			if (npfds || nsock == 0) {
    227 				if (pfds)
    228 					kmem_free(pfds, cursock*sizeof(*pfds));
    229 				pfds = npfds;
    230 				cursock = nsock;
    231 				rebuild = false;
    232 
    233 				i = 0;
    234 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    235 					pfds[i].fd = SO2S(su_iter->su_so);
    236 					pfds[i].events = POLLIN;
    237 					pfds[i].revents = 0;
    238 					i++;
    239 				}
    240 				KASSERT(i == nsock);
    241 			}
    242 			mutex_exit(&su_mtx);
    243 		}
    244 
    245 		/* find affected sockets & process */
    246 		rv = rumpuser_poll(pfds, cursock, POLLTIMEOUT, &error);
    247 		for (i = 0; i < cursock && rv > 0; i++) {
    248 			if (pfds[i].revents & POLLIN) {
    249 				mutex_enter(&su_mtx);
    250 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    251 					if (SO2S(su_iter->su_so)==pfds[i].fd) {
    252 						so = su_iter->su_so;
    253 						mutex_exit(&su_mtx);
    254 						mutex_enter(softnet_lock);
    255 						if(so->so_options&SO_ACCEPTCONN)
    256 							sockin_accept(so);
    257 						else
    258 							sockin_process(so);
    259 						mutex_exit(softnet_lock);
    260 						mutex_enter(&su_mtx);
    261 						break;
    262 					}
    263 				}
    264 				/* if we can't find it, just wing it */
    265 				KASSERT(rebuild || su_iter);
    266 				mutex_exit(&su_mtx);
    267 				pfds[i].revents = 0;
    268 				rv--;
    269 				i = -1;
    270 				continue;
    271 			}
    272 
    273 			/* something else?  ignore */
    274 			if (pfds[i].revents) {
    275 				pfds[i].revents = 0;
    276 				rv--;
    277 			}
    278 		}
    279 		KASSERT(rv <= 0);
    280 	}
    281 
    282 }
    283 #endif /* SOCKIN_NOTHREAD */
    284 
    285 static void
    286 sockin_init()
    287 {
    288 #ifndef SOCKIN_NOTHREAD
    289 	int rv;
    290 
    291 	if ((rv = kthread_create(PRI_NONE, 0, NULL, sockinworker,
    292 	    NULL, NULL, "sockwork")) != 0)
    293 		panic("sockin_init: could not create worker thread\n");
    294 #endif
    295 	mutex_init(&su_mtx, MUTEX_DEFAULT, IPL_NONE);
    296 }
    297 
    298 static int
    299 sockin_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
    300 	struct mbuf *control, struct lwp *l)
    301 {
    302 	int error = 0, rv;
    303 
    304 	switch (req) {
    305 	case PRU_ATTACH:
    306 	{
    307 		int news;
    308 
    309 		sosetlock(so);
    310 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    311 			error = soreserve(so, SOCKIN_SBSIZE, SOCKIN_SBSIZE);
    312 			if (error)
    313 				break;
    314 		}
    315 
    316 		news = rumpuser_net_socket(PF_INET, so->so_proto->pr_type,
    317 		    0, &error);
    318 		if (news == -1)
    319 			break;
    320 
    321 		if ((error = registersock(so, news)) != 0)
    322 			rumpuser_close(news, &error);
    323 
    324 		break;
    325 	}
    326 
    327 	case PRU_ACCEPT:
    328 		/* we do all the work in the worker thread */
    329 		break;
    330 
    331 	case PRU_BIND:
    332 		rumpuser_net_bind(SO2S(so), mtod(nam, const struct sockaddr *),
    333 		    sizeof(struct sockaddr_in), &error);
    334 		break;
    335 
    336 	case PRU_CONNECT:
    337 		/* don't bother to connect udp sockets, always sendmsg */
    338 		if (so->so_proto->pr_type == SOCK_DGRAM)
    339 			break;
    340 
    341 		rv = rumpuser_net_connect(SO2S(so),
    342 		    mtod(nam, struct sockaddr *), sizeof(struct sockaddr_in),
    343 		    &error);
    344 		if (rv == 0)
    345 		soisconnected(so);
    346 		break;
    347 
    348 	case PRU_LISTEN:
    349 		rumpuser_net_listen(SO2S(so), so->so_qlimit, &error);
    350 		break;
    351 
    352 	case PRU_SEND:
    353 	{
    354 		struct sockaddr *saddr;
    355 		struct msghdr mhdr;
    356 		struct iovec iov[16];
    357 		struct mbuf *m2;
    358 		size_t tot;
    359 		int i, s;
    360 
    361 		memset(&mhdr, 0, sizeof(mhdr));
    362 
    363 		tot = 0;
    364 		for (i = 0, m2 = m; m2; m2 = m2->m_next, i++) {
    365 			if (i > 16)
    366 				panic("lazy bum");
    367 			iov[i].iov_base = m2->m_data;
    368 			iov[i].iov_len = m2->m_len;
    369 			tot += m2->m_len;
    370 
    371 		}
    372 		mhdr.msg_iov = iov;
    373 		mhdr.msg_iovlen = i;
    374 		s = SO2S(so);
    375 
    376 		if (so->so_proto->pr_type == SOCK_DGRAM) {
    377 			saddr = mtod(nam, struct sockaddr *);
    378 			mhdr.msg_name = saddr;
    379 			mhdr.msg_namelen = saddr->sa_len;
    380 		}
    381 
    382 		rumpuser_net_sendmsg(s, &mhdr, 0, &error);
    383 
    384 		m_freem(m);
    385 		m_freem(control);
    386 #ifdef SOCKIN_NOTHREAD
    387 		/* this assumes too many things to list.. buthey, testing */
    388 		sockin_process(so);
    389 #endif
    390 	}
    391 		break;
    392 
    393 	case PRU_SHUTDOWN:
    394 	{
    395 		struct sockin_unit *su_iter;
    396 
    397 		mutex_enter(&su_mtx);
    398 		LIST_FOREACH(su_iter, &su_ent, su_entries) {
    399 			if (su_iter->su_so == so)
    400 				break;
    401 		}
    402 		if (!su_iter)
    403 			panic("no such socket");
    404 
    405 		LIST_REMOVE(su_iter, su_entries);
    406 		nsock--;
    407 		rebuild = true;
    408 		mutex_exit(&su_mtx);
    409 
    410 		rumpuser_close(SO2S(su_iter->su_so), &error);
    411 		kmem_free(su_iter, sizeof(*su_iter));
    412 	}
    413 		break;
    414 
    415 	default:
    416 		panic("sockin_usrreq: IMPLEMENT ME, req %d not supported", req);
    417 	}
    418 
    419 	return error;
    420 }
    421