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sockin.c revision 1.27 
      1 /*	$NetBSD: sockin.c,v 1.27 2013/03/18 13:14:11 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 1.27 2013/03/18 13:14:11 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 	int error;
    152 
    153 	mutex_enter(&su_mtx);
    154 	LIST_FOREACH(su_iter, &su_ent, su_entries) {
    155 		if (su_iter->su_so == so)
    156 			break;
    157 	}
    158 	if (!su_iter)
    159 		panic("no such socket");
    160 
    161 	LIST_REMOVE(su_iter, su_entries);
    162 	nsock--;
    163 	rebuild = true;
    164 	mutex_exit(&su_mtx);
    165 
    166 	rumpuser_close(SO2S(su_iter->su_so), &error);
    167 	kmem_free(su_iter, sizeof(*su_iter));
    168 }
    169 
    170 static void
    171 sockin_process(struct socket *so)
    172 {
    173 	struct sockaddr_in from;
    174 	struct iovec io;
    175 	struct msghdr rmsg;
    176 	struct mbuf *m;
    177 	ssize_t n;
    178 	size_t plen;
    179 	int error;
    180 
    181 	m = m_gethdr(M_WAIT, MT_DATA);
    182 	if (so->so_proto->pr_type == SOCK_DGRAM) {
    183 		plen = IP_MAXPACKET;
    184 		MEXTMALLOC(m, plen, M_DONTWAIT);
    185 	} else {
    186 		plen = MCLBYTES;
    187 		MCLGET(m, M_DONTWAIT);
    188 	}
    189 	if ((m->m_flags & M_EXT) == 0) {
    190 		m_freem(m);
    191 		return;
    192 	}
    193 
    194 	memset(&rmsg, 0, sizeof(rmsg));
    195 	io.iov_base = mtod(m, void *);
    196 	io.iov_len = plen;
    197 	rmsg.msg_iov = &io;
    198 	rmsg.msg_iovlen = 1;
    199 	rmsg.msg_name = (struct sockaddr *)&from;
    200 	rmsg.msg_namelen = sizeof(from);
    201 
    202 	n = rumpcomp_sockin_recvmsg(SO2S(so), &rmsg, 0, &error);
    203 	if (n <= 0) {
    204 		m_freem(m);
    205 
    206 		/* Treat a TCP socket a goner */
    207 		if (error != EAGAIN && so->so_proto->pr_type == SOCK_STREAM) {
    208 			mutex_enter(softnet_lock);
    209 			soisdisconnected(so);
    210 			mutex_exit(softnet_lock);
    211 			removesock(so);
    212 		}
    213 		return;
    214 	}
    215 	m->m_len = m->m_pkthdr.len = n;
    216 
    217 	bpf_mtap_af(&sockin_if, AF_UNSPEC, m);
    218 
    219 	mutex_enter(softnet_lock);
    220 	if (so->so_proto->pr_type == SOCK_DGRAM) {
    221 		if (!sbappendaddr(&so->so_rcv, rmsg.msg_name, m, NULL)) {
    222 			m_freem(m);
    223 		}
    224 	} else {
    225 		sbappendstream(&so->so_rcv, m);
    226 	}
    227 
    228 	sorwakeup(so);
    229 	mutex_exit(softnet_lock);
    230 }
    231 
    232 static void
    233 sockin_accept(struct socket *so)
    234 {
    235 	struct socket *nso;
    236 	struct sockaddr_in sin;
    237 	int news, error, slen;
    238 
    239 	slen = sizeof(sin);
    240 	news = rumpcomp_sockin_accept(SO2S(so), (struct sockaddr *)&sin,
    241 	    &slen, &error);
    242 	if (news == -1)
    243 		return;
    244 
    245 	mutex_enter(softnet_lock);
    246 	nso = sonewconn(so, SS_ISCONNECTED);
    247 	if (nso == NULL)
    248 		goto errout;
    249 	if (registersock(nso, news) != 0)
    250 		goto errout;
    251 	mutex_exit(softnet_lock);
    252 	return;
    253 
    254  errout:
    255 	rumpuser_close(news, &error);
    256 	if (nso)
    257 		soclose(nso);
    258 	mutex_exit(softnet_lock);
    259 }
    260 
    261 #define POLLTIMEOUT 100	/* check for new entries every 100ms */
    262 
    263 /* XXX: doesn't handle socket (kernel) locking properly? */
    264 static void
    265 sockinworker(void *arg)
    266 {
    267 	struct pollfd *pfds = NULL, *npfds;
    268 	struct sockin_unit *su_iter;
    269 	struct socket *so;
    270 	int cursock = 0, i, rv, error;
    271 
    272 	/*
    273 	 * Loop reading requests.  Check for new sockets periodically
    274 	 * (could be smarter, but I'm lazy).
    275 	 */
    276 	for (;;) {
    277 		if (rebuild) {
    278 			npfds = NULL;
    279 			mutex_enter(&su_mtx);
    280 			if (nsock)
    281 				npfds = kmem_alloc(nsock * sizeof(*npfds),
    282 				    KM_NOSLEEP);
    283 			if (npfds || nsock == 0) {
    284 				if (pfds)
    285 					kmem_free(pfds, cursock*sizeof(*pfds));
    286 				pfds = npfds;
    287 				cursock = nsock;
    288 				rebuild = false;
    289 
    290 				i = 0;
    291 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    292 					pfds[i].fd = SO2S(su_iter->su_so);
    293 					pfds[i].events = POLLIN;
    294 					pfds[i].revents = 0;
    295 					i++;
    296 				}
    297 				KASSERT(i == nsock);
    298 			}
    299 			mutex_exit(&su_mtx);
    300 		}
    301 
    302 		/* find affected sockets & process */
    303 		rv = rumpuser_poll(pfds, cursock, POLLTIMEOUT, &error);
    304 		for (i = 0; i < cursock && rv > 0; i++) {
    305 			if (pfds[i].revents & POLLIN) {
    306 				mutex_enter(&su_mtx);
    307 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    308 					if (SO2S(su_iter->su_so)==pfds[i].fd) {
    309 						so = su_iter->su_so;
    310 						mutex_exit(&su_mtx);
    311 						if(so->so_options&SO_ACCEPTCONN)
    312 							sockin_accept(so);
    313 						else
    314 							sockin_process(so);
    315 						mutex_enter(&su_mtx);
    316 						break;
    317 					}
    318 				}
    319 				/* if we can't find it, just wing it */
    320 				KASSERT(rebuild || su_iter);
    321 				mutex_exit(&su_mtx);
    322 				pfds[i].revents = 0;
    323 				rv--;
    324 				i = -1;
    325 				continue;
    326 			}
    327 
    328 			/* something else?  ignore */
    329 			if (pfds[i].revents) {
    330 				pfds[i].revents = 0;
    331 				rv--;
    332 			}
    333 		}
    334 		KASSERT(rv <= 0);
    335 	}
    336 
    337 }
    338 
    339 static void
    340 sockin_init(void)
    341 {
    342 	int rv;
    343 
    344 	if (rump_threads) {
    345 		if ((rv = kthread_create(PRI_NONE, 0, NULL, sockinworker,
    346 		    NULL, NULL, "sockwork")) != 0)
    347 			panic("sockin_init: could not create worker thread\n");
    348 	} else {
    349 		printf("sockin_init: no threads => no worker thread\n");
    350 	}
    351 	mutex_init(&su_mtx, MUTEX_DEFAULT, IPL_NONE);
    352 	strlcpy(sockin_if.if_xname, "sockin0", sizeof(sockin_if.if_xname));
    353 	bpf_attach(&sockin_if, DLT_NULL, 0);
    354 }
    355 
    356 static int
    357 sockin_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
    358 	struct mbuf *control, struct lwp *l)
    359 {
    360 	int error = 0, rv;
    361 
    362 	switch (req) {
    363 	case PRU_ATTACH:
    364 	{
    365 		int news, dummy;
    366 		int sbsize;
    367 
    368 		sosetlock(so);
    369 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    370 			error = soreserve(so, SOCKIN_SBSIZE, SOCKIN_SBSIZE);
    371 			if (error)
    372 				break;
    373 		}
    374 
    375 		news = rumpcomp_sockin_socket(PF_INET, so->so_proto->pr_type,
    376 		    0, &error);
    377 		if (news == -1)
    378 			break;
    379 
    380 		/* for UDP sockets, make sure we can send&recv max */
    381 		if (so->so_proto->pr_type == SOCK_DGRAM) {
    382 			sbsize = SOCKIN_SBSIZE;
    383 			rumpcomp_sockin_setsockopt(news,
    384 			    SOL_SOCKET, SO_SNDBUF,
    385 			    &sbsize, sizeof(sbsize), &error);
    386 			sbsize = SOCKIN_SBSIZE;
    387 			rumpcomp_sockin_setsockopt(news,
    388 			    SOL_SOCKET, SO_RCVBUF,
    389 			    &sbsize, sizeof(sbsize), &error);
    390 		}
    391 
    392 		if ((error = registersock(so, news)) != 0)
    393 			rumpuser_close(news, &dummy);
    394 
    395 		break;
    396 	}
    397 
    398 	case PRU_ACCEPT:
    399 		/* we do all the work in the worker thread */
    400 		break;
    401 
    402 	case PRU_BIND:
    403 		rumpcomp_sockin_bind(SO2S(so),
    404 		    mtod(nam, const struct sockaddr *),
    405 		    sizeof(struct sockaddr_in), &error);
    406 		break;
    407 
    408 	case PRU_CONNECT:
    409 		rv = rumpcomp_sockin_connect(SO2S(so),
    410 		    mtod(nam, struct sockaddr *), sizeof(struct sockaddr_in),
    411 		    &error);
    412 		if (rv == 0)
    413 			soisconnected(so);
    414 		break;
    415 
    416 	case PRU_LISTEN:
    417 		rumpcomp_sockin_listen(SO2S(so), so->so_qlimit, &error);
    418 		break;
    419 
    420 	case PRU_SEND:
    421 	{
    422 		struct sockaddr *saddr;
    423 		struct msghdr mhdr;
    424 		size_t iov_max, i;
    425 		struct iovec iov_buf[32], *iov;
    426 		struct mbuf *m2;
    427 		size_t tot;
    428 		int s;
    429 
    430 		bpf_mtap_af(&sockin_if, AF_UNSPEC, m);
    431 
    432 		memset(&mhdr, 0, sizeof(mhdr));
    433 
    434 		iov_max = 0;
    435 		for (m2 = m; m2 != NULL; m2 = m2->m_next) {
    436 			iov_max++;
    437 		}
    438 
    439 		if (iov_max <= __arraycount(iov_buf)) {
    440 			iov = iov_buf;
    441 		} else {
    442 			iov = kmem_alloc(sizeof(struct iovec) * iov_max,
    443 			    KM_SLEEP);
    444 		}
    445 
    446 		tot = 0;
    447 		for (i = 0, m2 = m; m2 != NULL; m2 = m2->m_next, i++) {
    448 			iov[i].iov_base = m2->m_data;
    449 			iov[i].iov_len = m2->m_len;
    450 			tot += m2->m_len;
    451 		}
    452 		mhdr.msg_iov = iov;
    453 		mhdr.msg_iovlen = i;
    454 		s = SO2S(so);
    455 
    456 		if (nam != NULL) {
    457 			saddr = mtod(nam, struct sockaddr *);
    458 			mhdr.msg_name = saddr;
    459 			mhdr.msg_namelen = saddr->sa_len;
    460 		}
    461 
    462 		rumpcomp_sockin_sendmsg(s, &mhdr, 0, &error);
    463 
    464 		if (iov != iov_buf)
    465 			kmem_free(iov, sizeof(struct iovec) * iov_max);
    466 
    467 		m_freem(m);
    468 		m_freem(control);
    469 
    470 		/* this assumes too many things to list.. buthey, testing */
    471 		if (!rump_threads)
    472 			sockin_process(so);
    473 	}
    474 		break;
    475 
    476 	case PRU_SHUTDOWN:
    477 		removesock(so);
    478 		break;
    479 
    480 	case PRU_SOCKADDR:
    481 	case PRU_PEERADDR:
    482 	{
    483 		int slen = nam->m_len;
    484 		enum rumpcomp_sockin_getnametype which;
    485 
    486 		if (req == PRU_SOCKADDR)
    487 			which = RUMPCOMP_SOCKIN_SOCKNAME;
    488 		else
    489 			which = RUMPCOMP_SOCKIN_PEERNAME;
    490 		rumpcomp_sockin_getname(SO2S(so),
    491 		    mtod(nam, struct sockaddr *), &slen, which, &error);
    492 		if (error == 0)
    493 			nam->m_len = slen;
    494 		break;
    495 	}
    496 
    497 	case PRU_CONTROL:
    498 		error = ENOTTY;
    499 		break;
    500 
    501 	default:
    502 		panic("sockin_usrreq: IMPLEMENT ME, req %d not supported", req);
    503 	}
    504 
    505 	return error;
    506 }
    507 
    508 static int
    509 sockin_ctloutput(int op, struct socket *so, struct sockopt *sopt)
    510 {
    511 	int error;
    512 
    513 	rumpcomp_sockin_setsockopt(SO2S(so), sopt->sopt_level,
    514 	    sopt->sopt_name, sopt->sopt_data, sopt->sopt_size, &error);
    515 	return error;
    516 }
    517