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sockin.c revision 1.3.2.2 
      1 /*	$NetBSD: sockin.c,v 1.3.2.2 2008/10/19 22:18:08 haad 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 <netinet/in.h>
     43 #include <netinet/in_systm.h>
     44 #include <netinet/ip.h>
     45 
     46 #include <rump/rumpuser.h>
     47 
     48 /*
     49  * An inet communication domain which uses the socket interface.
     50  * Currently supports only IPv4 UDP, but could easily be extended to
     51  * support IPv6 and TCP by adding more stuff to the protosw.
     52  */
     53 
     54 DOMAIN_DEFINE(sockindomain);
     55 
     56 static void	sockin_init(void);
     57 static int	sockin_usrreq(struct socket *, int, struct mbuf *,
     58 			      struct mbuf *, struct mbuf *, struct lwp *);
     59 
     60 const struct protosw sockinsw[] = {
     61 {
     62 	.pr_type = SOCK_DGRAM,
     63 	.pr_domain = &sockindomain,
     64 	.pr_protocol = IPPROTO_UDP,
     65 	.pr_flags = PR_ATOMIC|PR_ADDR,
     66 	.pr_usrreq = sockin_usrreq,
     67 },
     68 {
     69 	.pr_type = SOCK_STREAM,
     70 	.pr_domain = &sockindomain,
     71 	.pr_protocol = IPPROTO_TCP,
     72 	.pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS,
     73 	.pr_usrreq = sockin_usrreq,
     74 }};
     75 
     76 struct domain sockindomain = {
     77 	.dom_family = PF_INET,
     78 	.dom_name = "socket_inet",
     79 	.dom_init = sockin_init,
     80 	.dom_externalize = NULL,
     81 	.dom_dispose = NULL,
     82 	.dom_protosw = sockinsw,
     83 	.dom_protoswNPROTOSW = &sockinsw[__arraycount(sockinsw)],
     84 	.dom_rtattach = NULL,
     85 	.dom_rtoffset = 0,
     86 	.dom_maxrtkey = 0,
     87 	.dom_ifattach = NULL,
     88 	.dom_ifdetach = NULL,
     89 	.dom_ifqueues = { NULL },
     90 	.dom_link = { NULL },
     91 	.dom_mowner = MOWNER_INIT("",""),
     92 	.dom_rtcache = { NULL },
     93 	.dom_sockaddr_cmp = NULL
     94 };
     95 
     96 /* only for testing */
     97 #if 0
     98 #define SOCKIN_NOTHREAD
     99 #endif
    100 
    101 #define SO2S(so) ((intptr_t)(so->so_internal))
    102 #define SOCKIN_SBSIZE 65536
    103 
    104 static void
    105 sockin_process(struct socket *so)
    106 {
    107 	struct sockaddr_in from;
    108 	struct iovec io;
    109 	struct msghdr rmsg;
    110 	struct mbuf *m;
    111 	ssize_t n;
    112 	size_t plen;
    113 	int error;
    114 
    115 	plen = IP_MAXPACKET;
    116 	m = m_gethdr(M_WAIT, MT_DATA);
    117 	MEXTMALLOC(m, plen, M_WAIT);
    118 
    119 	memset(&rmsg, 0, sizeof(rmsg));
    120 	io.iov_base = mtod(m, void *);
    121 	io.iov_len = plen;
    122 	rmsg.msg_iov = &io;
    123 	rmsg.msg_iovlen = 1;
    124 	rmsg.msg_name = (struct sockaddr *)&from;
    125 	rmsg.msg_namelen = sizeof(from);
    126 
    127 	n = rumpuser_net_recvmsg(SO2S(so), &rmsg, 0, &error);
    128 	if (n <= 0) {
    129 		m_freem(m);
    130 		return;
    131 	}
    132 	m->m_len = m->m_pkthdr.len = n;
    133 
    134 	if (so->so_proto->pr_type == SOCK_DGRAM) {
    135 		if (!sbappendaddr(&so->so_rcv, rmsg.msg_name, m, NULL)) {
    136 			m_freem(m);
    137 		}
    138 	} else {
    139 		sbappendstream(&so->so_rcv, m);
    140 	}
    141 
    142 	sorwakeup(so);
    143 }
    144 
    145 struct sockin_unit {
    146 	struct socket *su_so;
    147 
    148 	LIST_ENTRY(sockin_unit) su_entries;
    149 };
    150 static LIST_HEAD(, sockin_unit) su_ent = LIST_HEAD_INITIALIZER(su_ent);
    151 static kmutex_t su_mtx;
    152 static bool rebuild;
    153 static int nsock;
    154 
    155 #ifndef SOCKIN_NOTHREAD
    156 #define POLLTIMEOUT 100	/* check for new entries every 100ms */
    157 
    158 /* XXX: doesn't handle socket (kernel) locking properly? */
    159 static void
    160 sockinworker(void *arg)
    161 {
    162 	struct pollfd *pfds = NULL, *npfds;
    163 	struct sockin_unit *su_iter;
    164 	int cursock = 0, i, rv, error;
    165 
    166 	/*
    167 	 * Loop reading requests.  Check for new sockets periodically
    168 	 * (could be smarter, but I'm lazy).
    169 	 */
    170 	for (;;) {
    171 		if (rebuild) {
    172 			npfds = NULL;
    173 			mutex_enter(&su_mtx);
    174 			if (nsock)
    175 				npfds = kmem_alloc(nsock * sizeof(*npfds),
    176 				    KM_NOSLEEP);
    177 			if (npfds || nsock == 0) {
    178 				if (pfds)
    179 					kmem_free(pfds, cursock*sizeof(*pfds));
    180 				pfds = npfds;
    181 				cursock = nsock;
    182 				rebuild = false;
    183 
    184 				i = 0;
    185 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    186 					pfds[i].fd = SO2S(su_iter->su_so);
    187 					pfds[i].events = POLLIN;
    188 					pfds[i].revents = 0;
    189 					i++;
    190 				}
    191 				KASSERT(i == nsock);
    192 			}
    193 			mutex_exit(&su_mtx);
    194 		}
    195 
    196 		/* find affected sockets & process */
    197 		rv = rumpuser_poll(pfds, cursock, POLLTIMEOUT, &error);
    198 		for (i = 0; i < cursock && rv > 0; i++) {
    199 			if (pfds[i].revents & POLLIN) {
    200 				mutex_enter(&su_mtx);
    201 				LIST_FOREACH(su_iter, &su_ent, su_entries) {
    202 					if (SO2S(su_iter->su_so)==pfds[i].fd) {
    203 						mutex_enter(softnet_lock);
    204 						sockin_process(su_iter->su_so);
    205 						mutex_exit(softnet_lock);
    206 						break;
    207 					}
    208 				}
    209 				/* if we can't find it, just wing it */
    210 				KASSERT(rebuild || su_iter);
    211 				mutex_exit(&su_mtx);
    212 				pfds[i].revents = 0;
    213 				rv--;
    214 				i = -1;
    215 				continue;
    216 			}
    217 
    218 			/* something else?  ignore */
    219 			if (pfds[i].revents) {
    220 				pfds[i].revents = 0;
    221 				rv--;
    222 			}
    223 		}
    224 		KASSERT(rv <= 0);
    225 	}
    226 
    227 }
    228 #endif /* SOCKIN_NOTHREAD */
    229 
    230 static void
    231 sockin_init()
    232 {
    233 #ifndef SOCKIN_NOTHREAD
    234 	int rv;
    235 
    236 	if ((rv = kthread_create(PRI_NONE, 0, NULL, sockinworker,
    237 	    NULL, NULL, "sockwork")) != 0)
    238 		panic("sockin_init: could not create worker thread\n");
    239 #endif
    240 	mutex_init(&su_mtx, MUTEX_DEFAULT, IPL_NONE);
    241 }
    242 
    243 static int
    244 sockin_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
    245 	struct mbuf *control, struct lwp *l)
    246 {
    247 	int error = 0, rv;
    248 
    249 	switch (req) {
    250 	case PRU_ATTACH:
    251 	{
    252 		struct sockin_unit *su;
    253 		int news;
    254 
    255 		sosetlock(so);
    256 		if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    257 			error = soreserve(so, SOCKIN_SBSIZE, SOCKIN_SBSIZE);
    258 			if (error)
    259 				break;
    260 		}
    261 
    262 		su = kmem_alloc(sizeof(*su), KM_NOSLEEP);
    263 		if (!su) {
    264 			error = ENOMEM;
    265 			break;
    266 		}
    267 
    268 		news = rumpuser_net_socket(PF_INET, so->so_proto->pr_type,
    269 		    0, &error);
    270 		if (news == -1) {
    271 			kmem_free(su, sizeof(*su));
    272 			break;
    273 		}
    274 		so->so_internal = (void *)(intptr_t)news;
    275 		su->su_so = so;
    276 
    277 		mutex_enter(&su_mtx);
    278 		LIST_INSERT_HEAD(&su_ent, su, su_entries);
    279 		nsock++;
    280 		rebuild = true;
    281 		mutex_exit(&su_mtx);
    282 		break;
    283 	}
    284 
    285 	case PRU_CONNECT:
    286 		/* don't bother to connect udp sockets, always sendmsg */
    287 		if (so->so_proto->pr_type == SOCK_DGRAM)
    288 			break;
    289 
    290 		rv = rumpuser_net_connect(SO2S(so),
    291 		    mtod(nam, struct sockaddr *), sizeof(struct sockaddr_in),
    292 		    &error);
    293 		if (rv == 0)
    294 		soisconnected(so);
    295 		break;
    296 
    297 	case PRU_SEND:
    298 	{
    299 		struct sockaddr *saddr;
    300 		struct msghdr mhdr;
    301 		struct iovec iov[16];
    302 		struct mbuf *m2;
    303 		size_t tot;
    304 		int i, s;
    305 
    306 		memset(&mhdr, 0, sizeof(mhdr));
    307 
    308 		tot = 0;
    309 		for (i = 0, m2 = m; m2; m2 = m2->m_next, i++) {
    310 			if (i > 16)
    311 				panic("lazy bum");
    312 			iov[i].iov_base = m2->m_data;
    313 			iov[i].iov_len = m2->m_len;
    314 			tot += m2->m_len;
    315 
    316 		}
    317 		mhdr.msg_iov = iov;
    318 		mhdr.msg_iovlen = i;
    319 		s = SO2S(so);
    320 
    321 		if (so->so_proto->pr_type == SOCK_DGRAM) {
    322 			saddr = mtod(nam, struct sockaddr *);
    323 			mhdr.msg_name = saddr;
    324 			mhdr.msg_namelen = saddr->sa_len;
    325 		}
    326 
    327 		rumpuser_net_sendmsg(s, &mhdr, 0, &error);
    328 
    329 		m_freem(m);
    330 		m_freem(control);
    331 #ifdef SOCKIN_NOTHREAD
    332 		/* this assumes too many things to list.. buthey, testing */
    333 		sockin_process(so);
    334 #endif
    335 	}
    336 		break;
    337 
    338 	case PRU_SHUTDOWN:
    339 	{
    340 		struct sockin_unit *su_iter;
    341 
    342 		mutex_enter(&su_mtx);
    343 		LIST_FOREACH(su_iter, &su_ent, su_entries) {
    344 			if (su_iter->su_so == so)
    345 				break;
    346 		}
    347 		if (!su_iter)
    348 			panic("no such socket");
    349 
    350 		LIST_REMOVE(su_iter, su_entries);
    351 		nsock--;
    352 		rebuild = true;
    353 		mutex_exit(&su_mtx);
    354 
    355 		rumpuser_close(SO2S(su_iter->su_so), &error);
    356 		kmem_free(su_iter, sizeof(*su_iter));
    357 	}
    358 		break;
    359 
    360 	default:
    361 		panic("sockin_usrreq: IMPLEMENT ME, req %d not supported", req);
    362 	}
    363 
    364 	return error;
    365 }
    366