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sockin.c revision 1.29 
      1 /*	$NetBSD: sockin.c,v 1.29 2013/04/30 00:03:54 pooka 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 1.29 2013/04/30 00:03:54 pooka 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/bpf.h>
     46 #include <net/if.h>
     47 #include <net/radix.h>
     48 
     49 #include <netinet/in.h>
     50 #include <netinet/in_systm.h>
     51 #include <netinet/ip.h>
     52 
     53 #include <rump/rumpuser.h>
     54 
     55 #include "rump_private.h"
     56 #include "rumpcomp_user.h"
     57 
     58 /*
     59  * An inet communication domain which uses the socket interface.
     60  * Currently supports only IPv4 UDP, but could easily be extended to
     61  * support IPv6 and TCP by adding more stuff to the protosw.
     62  */
     63 
     64 DOMAIN_DEFINE(sockindomain);
     65 
     66 static void	sockin_init(void);
     67 static int	sockin_usrreq(struct socket *, int, struct mbuf *,
     68 			      struct mbuf *, struct mbuf *, struct lwp *);
     69 static int	sockin_ctloutput(int op, struct socket *, struct sockopt *);
     70 
     71 const struct protosw sockinsw[] = {
     72 {
     73 	.pr_type = SOCK_DGRAM,
     74 	.pr_domain = &sockindomain,
     75 	.pr_protocol = IPPROTO_UDP,
     76 	.pr_flags = PR_ATOMIC|PR_ADDR,
     77 	.pr_usrreq = sockin_usrreq,
     78 	.pr_ctloutput = sockin_ctloutput,
     79 },
     80 {
     81 	.pr_type = SOCK_STREAM,
     82 	.pr_domain = &sockindomain,
     83 	.pr_protocol = IPPROTO_TCP,
     84 	.pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS,
     85 	.pr_usrreq = sockin_usrreq,
     86 	.pr_ctloutput = sockin_ctloutput,
     87 }};
     88 
     89 struct domain sockindomain = {
     90 	.dom_family = PF_INET,
     91 	.dom_name = "socket_inet",
     92 	.dom_init = sockin_init,
     93 	.dom_externalize = NULL,
     94 	.dom_dispose = NULL,
     95 	.dom_protosw = sockinsw,
     96 	.dom_protoswNPROTOSW = &sockinsw[__arraycount(sockinsw)],
     97 	.dom_rtattach = rt_inithead,
     98 	.dom_rtoffset = 32,
     99 	.dom_maxrtkey = sizeof(struct sockaddr_in),
    100 	.dom_ifattach = NULL,
    101 	.dom_ifdetach = NULL,
    102 	.dom_ifqueues = { NULL },
    103 	.dom_link = { NULL },
    104 	.dom_mowner = MOWNER_INIT("",""),
    105 	.dom_rtcache = { NULL },
    106 	.dom_sockaddr_cmp = NULL
    107 };
    108 
    109 #define SO2S(so) ((intptr_t)(so->so_internal))
    110 #define SOCKIN_SBSIZE 65536
    111 
    112 struct sockin_unit {
    113 	struct socket *su_so;
    114 
    115 	LIST_ENTRY(sockin_unit) su_entries;
    116 };
    117 static LIST_HEAD(, sockin_unit) su_ent = LIST_HEAD_INITIALIZER(su_ent);
    118 static kmutex_t su_mtx;
    119 static bool rebuild;
    120 static int nsock;
    121 
    122 /* XXX: for the bpf hack */
    123 static struct ifnet sockin_if;
    124 int ifpromisc(struct ifnet *ifp, int pswitch) { return 0; }
    125 
    126 static int
    127 registersock(struct socket *so, int news)
    128 {
    129 	struct sockin_unit *su;
    130 
    131 	su = kmem_alloc(sizeof(*su), KM_NOSLEEP);
    132 	if (!su)
    133 		return ENOMEM;
    134 
    135 	so->so_internal = (void *)(intptr_t)news;
    136 	su->su_so = so;
    137 
    138 	mutex_enter(&su_mtx);
    139 	LIST_INSERT_HEAD(&su_ent, su, su_entries);
    140 	nsock++;
    141 	rebuild = true;
    142 	mutex_exit(&su_mtx);
    143 
    144 	return 0;
    145 }
    146 
    147 static void
    148 removesock(struct socket *so)
    149 {
    150 	struct sockin_unit *su_iter;
    151 
    152 	mutex_enter(&su_mtx);
    153 	LIST_FOREACH(su_iter, &su_ent, su_entries) {
    154 		if (su_iter->su_so == so)
    155 			break;
    156 	}
    157 	if (!su_iter)
    158 		panic("no such socket");
    159 
    160 	LIST_REMOVE(su_iter, su_entries);
    161 	nsock--;
    162 	rebuild = true;
    163 	mutex_exit(&su_mtx);
    164 
    165 	rumpuser_close(SO2S(su_iter->su_so));
    166 	kmem_free(su_iter, sizeof(*su_iter));
    167 }
    168 
    169 static void
    170 sockin_process(struct socket *so)
    171 {
    172 	struct sockaddr_in from;
    173 	struct iovec io;
    174 	struct msghdr rmsg;
    175 	struct mbuf *m;
    176 	ssize_t n;
    177 	size_t plen;
    178 	int error;
    179 
    180 	m = m_gethdr(M_WAIT, MT_DATA);
    181 	if (so->so_proto->pr_type == SOCK_DGRAM) {
    182 		plen = IP_MAXPACKET;
    183 		MEXTMALLOC(m, plen, M_DONTWAIT);
    184 	} else {
    185 		plen = MCLBYTES;
    186 		MCLGET(m, M_DONTWAIT);
    187 	}
    188 	if ((m->m_flags & M_EXT) == 0) {
    189 		m_freem(m);
    190 		return;
    191 	}
    192 
    193 	memset(&rmsg, 0, sizeof(rmsg));
    194 	io.iov_base = mtod(m, void *);
    195 	io.iov_len = plen;
    196 	rmsg.msg_iov = &io;
    197 	rmsg.msg_iovlen = 1;
    198 	rmsg.msg_name = (struct sockaddr *)&from;
    199 	rmsg.msg_namelen = sizeof(from);
    200 
    201 	n = rumpcomp_sockin_recvmsg(SO2S(so), &rmsg, 0, &error);
    202 	if (n <= 0) {
    203 		m_freem(m);
    204 
    205 		/* Treat a TCP socket a goner */
    206 		if (error != EAGAIN && so->so_proto->pr_type == SOCK_STREAM) {
    207 			mutex_enter(softnet_lock);
    208 			soisdisconnected(so);
    209 			mutex_exit(softnet_lock);
    210 			removesock(so);
    211 		}
    212 		return;
    213 	}
    214 	m->m_len = m->m_pkthdr.len = n;
    215 
    216 	bpf_mtap_af(&sockin_if, AF_UNSPEC, m);
    217 
    218 	mutex_enter(softnet_lock);
    219 	if (so->so_proto->pr_type == SOCK_DGRAM) {
    220 		if (!sbappendaddr(&so->so_rcv, rmsg.msg_name, m, NULL)) {
    221 			m_freem(m);
    222 		}
    223 	} else {
    224 		sbappendstream(&so->so_rcv, m);
    225 	}
    226 
    227 	sorwakeup(so);
    228 	mutex_exit(softnet_lock);
    229 }
    230 
    231 static void
    232 sockin_accept(struct socket *so)
    233 {
    234 	struct socket *nso;
    235 	struct sockaddr_in sin;
    236 	int news, error, slen;
    237 
    238 	slen = sizeof(sin);
    239 	error = rumpcomp_sockin_accept(SO2S(so), (struct sockaddr *)&sin,
    240 	    &slen, &news);
    241 	if (error)
    242 		return;
    243 
    244 	mutex_enter(softnet_lock);
    245 	nso = sonewconn(so, SS_ISCONNECTED);
    246 	if (nso == NULL)
    247 		goto errout;
    248 	if (registersock(nso, news) != 0)
    249 		goto errout;
    250 	mutex_exit(softnet_lock);
    251 	return;
    252 
    253  errout:
    254 	rumpuser_close(news);
    255 	if (nso)
    256 		soclose(nso);
    257 	mutex_exit(softnet_lock);
    258 }
    259 
    260 #define POLLTIMEOUT 100	/* check for new entries every 100ms */
    261 
    262 /* XXX: doesn't handle socket (kernel) locking properly? */
    263 static void
    264 sockinworker(void *arg)
    265 {
    266 	struct pollfd *pfds = NULL, *npfds;
    267 	struct sockin_unit *su_iter;
    268 	struct socket *so;
    269 	int cursock = 0, i, rv, error;
    270 
    271 	/*
    272 	 * Loop reading requests.  Check for new sockets periodically
    273 	 * (could be smarter, but I'm lazy).
    274 	 */
    275 	for (;;) {
    276 		if (rebuild) {
    277 			npfds = NULL;
    278 			mutex_enter(&su_mtx);
    279 			if (nsock)
    280 				npfds = kmem_alloc(nsock * sizeof(*npfds),
    281 				    KM_NOSLEEP);
    282 			if (npfds || nsock == 0) {
    283 				if (pfds)
    284 					kmem_free(pfds, cursock*sizeof(*pfds));
    285 				pfds = npfds;
    286 				cursock = nsock;
    287 				rebuild = false;
    288 
    289 				i = 0;
    290 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    291 					pfds[i].fd = SO2S(su_iter->su_so);
    292 					pfds[i].events = POLLIN;
    293 					pfds[i].revents = 0;
    294 					i++;
    295 				}
    296 				KASSERT(i == nsock);
    297 			}
    298 			mutex_exit(&su_mtx);
    299 		}
    300 
    301 		/* find affected sockets & process */
    302 		error = rumpcomp_sockin_poll(pfds, cursock, POLLTIMEOUT, &rv);
    303 		for (i = 0; i < cursock && rv > 0 && error == 0; i++) {
    304 			if (pfds[i].revents & POLLIN) {
    305 				mutex_enter(&su_mtx);
    306 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    307 					if (SO2S(su_iter->su_so)==pfds[i].fd) {
    308 						so = su_iter->su_so;
    309 						mutex_exit(&su_mtx);
    310 						if(so->so_options&SO_ACCEPTCONN)
    311 							sockin_accept(so);
    312 						else
    313 							sockin_process(so);
    314 						mutex_enter(&su_mtx);
    315 						break;
    316 					}
    317 				}
    318 				/* if we can't find it, just wing it */
    319 				KASSERT(rebuild || su_iter);
    320 				mutex_exit(&su_mtx);
    321 				pfds[i].revents = 0;
    322 				rv--;
    323 				i = -1;
    324 				continue;
    325 			}
    326 
    327 			/* something else?  ignore */
    328 			if (pfds[i].revents) {
    329 				pfds[i].revents = 0;
    330 				rv--;
    331 			}
    332 		}
    333 		KASSERT(rv <= 0);
    334 	}
    335 
    336 }
    337 
    338 static void
    339 sockin_init(void)
    340 {
    341 	int rv;
    342 
    343 	if (rump_threads) {
    344 		if ((rv = kthread_create(PRI_NONE, 0, NULL, sockinworker,
    345 		    NULL, NULL, "sockwork")) != 0)
    346 			panic("sockin_init: could not create worker thread\n");
    347 	} else {
    348 		printf("sockin_init: no threads => no worker thread\n");
    349 	}
    350 	mutex_init(&su_mtx, MUTEX_DEFAULT, IPL_NONE);
    351 	strlcpy(sockin_if.if_xname, "sockin0", sizeof(sockin_if.if_xname));
    352 	bpf_attach(&sockin_if, DLT_NULL, 0);
    353 }
    354 
    355 static int
    356 sockin_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
    357 	struct mbuf *control, struct lwp *l)
    358 {
    359 	int error = 0;
    360 
    361 	switch (req) {
    362 	case PRU_ATTACH:
    363 	{
    364 		int news;
    365 		int sbsize;
    366 
    367 		sosetlock(so);
    368 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    369 			error = soreserve(so, SOCKIN_SBSIZE, SOCKIN_SBSIZE);
    370 			if (error)
    371 				break;
    372 		}
    373 
    374 		news = rumpcomp_sockin_socket(PF_INET, so->so_proto->pr_type,
    375 		    0, &error);
    376 		if (news == -1)
    377 			break;
    378 
    379 		/* for UDP sockets, make sure we can send&recv max */
    380 		if (so->so_proto->pr_type == SOCK_DGRAM) {
    381 			sbsize = SOCKIN_SBSIZE;
    382 			error = rumpcomp_sockin_setsockopt(news,
    383 			    SOL_SOCKET, SO_SNDBUF,
    384 			    &sbsize, sizeof(sbsize));
    385 			sbsize = SOCKIN_SBSIZE;
    386 			error = rumpcomp_sockin_setsockopt(news,
    387 			    SOL_SOCKET, SO_RCVBUF,
    388 			    &sbsize, sizeof(sbsize));
    389 		}
    390 
    391 		if ((error = registersock(so, news)) != 0)
    392 			rumpuser_close(news);
    393 
    394 		break;
    395 	}
    396 
    397 	case PRU_ACCEPT:
    398 		/* we do all the work in the worker thread */
    399 		break;
    400 
    401 	case PRU_BIND:
    402 		error = rumpcomp_sockin_bind(SO2S(so),
    403 		    mtod(nam, const struct sockaddr *),
    404 		    sizeof(struct sockaddr_in));
    405 		break;
    406 
    407 	case PRU_CONNECT:
    408 		error = rumpcomp_sockin_connect(SO2S(so),
    409 		    mtod(nam, struct sockaddr *), sizeof(struct sockaddr_in));
    410 		if (error == 0)
    411 			soisconnected(so);
    412 		break;
    413 
    414 	case PRU_LISTEN:
    415 		error = rumpcomp_sockin_listen(SO2S(so), so->so_qlimit);
    416 		break;
    417 
    418 	case PRU_SEND:
    419 	{
    420 		struct sockaddr *saddr;
    421 		struct msghdr mhdr;
    422 		size_t iov_max, i;
    423 		struct iovec iov_buf[32], *iov;
    424 		struct mbuf *m2;
    425 		size_t tot;
    426 		int s;
    427 
    428 		bpf_mtap_af(&sockin_if, AF_UNSPEC, m);
    429 
    430 		memset(&mhdr, 0, sizeof(mhdr));
    431 
    432 		iov_max = 0;
    433 		for (m2 = m; m2 != NULL; m2 = m2->m_next) {
    434 			iov_max++;
    435 		}
    436 
    437 		if (iov_max <= __arraycount(iov_buf)) {
    438 			iov = iov_buf;
    439 		} else {
    440 			iov = kmem_alloc(sizeof(struct iovec) * iov_max,
    441 			    KM_SLEEP);
    442 		}
    443 
    444 		tot = 0;
    445 		for (i = 0, m2 = m; m2 != NULL; m2 = m2->m_next, i++) {
    446 			iov[i].iov_base = m2->m_data;
    447 			iov[i].iov_len = m2->m_len;
    448 			tot += m2->m_len;
    449 		}
    450 		mhdr.msg_iov = iov;
    451 		mhdr.msg_iovlen = i;
    452 		s = SO2S(so);
    453 
    454 		if (nam != NULL) {
    455 			saddr = mtod(nam, struct sockaddr *);
    456 			mhdr.msg_name = saddr;
    457 			mhdr.msg_namelen = saddr->sa_len;
    458 		}
    459 
    460 		rumpcomp_sockin_sendmsg(s, &mhdr, 0, &error);
    461 
    462 		if (iov != iov_buf)
    463 			kmem_free(iov, sizeof(struct iovec) * iov_max);
    464 
    465 		m_freem(m);
    466 		m_freem(control);
    467 
    468 		/* this assumes too many things to list.. buthey, testing */
    469 		if (!rump_threads)
    470 			sockin_process(so);
    471 	}
    472 		break;
    473 
    474 	case PRU_SHUTDOWN:
    475 		removesock(so);
    476 		break;
    477 
    478 	case PRU_SOCKADDR:
    479 	case PRU_PEERADDR:
    480 	{
    481 		int slen = nam->m_len;
    482 		enum rumpcomp_sockin_getnametype which;
    483 
    484 		if (req == PRU_SOCKADDR)
    485 			which = RUMPCOMP_SOCKIN_SOCKNAME;
    486 		else
    487 			which = RUMPCOMP_SOCKIN_PEERNAME;
    488 		error = rumpcomp_sockin_getname(SO2S(so),
    489 		    mtod(nam, struct sockaddr *), &slen, which);
    490 		if (error == 0)
    491 			nam->m_len = slen;
    492 		break;
    493 	}
    494 
    495 	case PRU_CONTROL:
    496 		error = ENOTTY;
    497 		break;
    498 
    499 	default:
    500 		panic("sockin_usrreq: IMPLEMENT ME, req %d not supported", req);
    501 	}
    502 
    503 	return error;
    504 }
    505 
    506 static int
    507 sockin_ctloutput(int op, struct socket *so, struct sockopt *sopt)
    508 {
    509 
    510 	return rumpcomp_sockin_setsockopt(SO2S(so), sopt->sopt_level,
    511 	    sopt->sopt_name, sopt->sopt_data, sopt->sopt_size);
    512 }
    513