1 /* $NetBSD: if_virt.c,v 1.5 2008/12/18 00:24:13 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/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: if_virt.c,v 1.5 2008/12/18 00:24:13 pooka Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/condvar.h> 33 #include <sys/fcntl.h> 34 #include <sys/kmem.h> 35 #include <sys/kthread.h> 36 #include <sys/mutex.h> 37 #include <sys/sockio.h> 38 #include <sys/socketvar.h> 39 40 #include <net/if.h> 41 #include <net/if_ether.h> 42 #include <net/if_tap.h> 43 44 #include <netinet/in.h> 45 #include <netinet/in_var.h> 46 47 #include <rump/rump.h> 48 #include <rump/rumpuser.h> 49 50 #include "rump_private.h" 51 52 /* 53 * Virtual interface for userspace purposes. Uses tap(4) to 54 * interface with the kernel and just simply shovels data 55 * to/from /dev/tap. 56 */ 57 58 #define VIRTIF_BASE "virt" 59 static int nunits; 60 61 static int virtif_init(struct ifnet *); 62 static int virtif_ioctl(struct ifnet *, u_long, void *); 63 static void virtif_start(struct ifnet *); 64 static void virtif_stop(struct ifnet *, int); 65 66 struct virtif_sc { 67 struct ifnet sc_if; 68 char sc_tapname[IFNAMSIZ]; 69 int sc_tapfd; 70 }; 71 72 static int virtif_create(struct ifaliasreq *, struct ifnet **); 73 static void virtif_worker(void *); 74 75 /* XXXXX: this prototype needs to go elsewhere */ 76 int rump_virtif_create(struct ifaliasreq *, struct ifnet **); 77 int 78 rump_virtif_create(struct ifaliasreq *ia, struct ifnet **ifpp) 79 { 80 81 return virtif_create(ia, ifpp); 82 } 83 84 /* 85 * Create a socket and call ifioctl() to configure the interface. 86 * This trickles down to virtif_ioctl(). 87 */ 88 static int 89 configaddr(struct ifnet *ifp, struct ifaliasreq *ia) 90 { 91 struct socket *so; 92 int error; 93 94 strcpy(ia->ifra_name, ifp->if_xname); 95 error = socreate(ia->ifra_addr.sa_family, &so, SOCK_DGRAM, 96 0, curlwp, NULL); 97 if (error) 98 return error; 99 error = ifioctl(so, SIOCAIFADDR, ia, curlwp); 100 soclose(so); 101 102 return error; 103 } 104 105 static int 106 virtif_create(struct ifaliasreq *ia, struct ifnet **ifpp) 107 { 108 struct virtif_sc *sc; 109 struct ifreq ifr; 110 struct ifnet *ifp; 111 uint8_t enaddr[ETHER_ADDR_LEN] = { 0xb2, 0x0a, 0x00, 0x0b, 0x0e, 0x01 }; 112 int fd, rv, error; 113 int mynum; 114 115 /* 116 * XXX: this is currently un-sane. Need to figure out a way 117 * to configure this with a bridge into a sane network without 118 * hardcoding it. 119 */ 120 fd = rumpuser_open("/dev/tap0", O_RDWR, &error); 121 if (fd == -1) { 122 printf("virtif_create: can't open /dev/tap %d\n", error); 123 return error; 124 } 125 126 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 127 rv = rumpuser_ioctl(fd, TAPGIFNAME, &ifr, &error); 128 if (rv == -1) { 129 kmem_free(sc, sizeof(*sc)); 130 return error; 131 } 132 strlcpy(sc->sc_tapname, ifr.ifr_name, IFNAMSIZ); 133 sc->sc_tapfd = fd; 134 135 ifp = &sc->sc_if; 136 mynum = nunits++; 137 sprintf(ifp->if_xname, "%s%d", VIRTIF_BASE, mynum); 138 ifp->if_softc = sc; 139 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 140 ifp->if_init = virtif_init; 141 ifp->if_ioctl = virtif_ioctl; 142 ifp->if_start = virtif_start; 143 ifp->if_stop = virtif_stop; 144 145 if (rump_threads) { 146 rv = kthread_create(PRI_NONE, 0, NULL, virtif_worker, ifp, 147 NULL, "virtifi"); 148 if (rv) { 149 kmem_free(sc, sizeof(*sc)); 150 return rv; 151 } 152 } else { 153 printf("WARNING: threads not enabled, receive NOT working\n"); 154 } 155 156 if_attach(ifp); 157 ether_ifattach(ifp, enaddr); 158 159 if (ia) 160 configaddr(ifp, ia); 161 if (ifpp) 162 *ifpp = ifp; 163 164 return 0; 165 } 166 167 static int 168 virtif_init(struct ifnet *ifp) 169 { 170 171 ifp->if_flags |= IFF_RUNNING; 172 173 return 0; 174 } 175 176 static int 177 virtif_ioctl(struct ifnet *ifp, u_long cmd, void *data) 178 { 179 int s, rv; 180 181 s = splnet(); 182 rv = ether_ioctl(ifp, cmd, data); 183 splx(s); 184 185 return rv; 186 } 187 188 /* just send everything in-context */ 189 static void 190 virtif_start(struct ifnet *ifp) 191 { 192 struct virtif_sc *sc = ifp->if_softc; 193 struct iovec io[16]; 194 struct mbuf *m, *m0; 195 int s, i, error; 196 197 s = splnet(); 198 for (;;) { 199 IF_DEQUEUE(&ifp->if_snd, m0); 200 if (!m0) 201 break; 202 splx(s); 203 204 m = m0; 205 for (i = 0; i < 16 && m; i++) { 206 io[i].iov_base = mtod(m, void *); 207 io[i].iov_len = m->m_len; 208 m = m->m_next; 209 } 210 if (i == 16) 211 panic("lazy bum"); 212 rumpuser_writev(sc->sc_tapfd, io, i, &error); 213 m_freem(m0); 214 s = splnet(); 215 } 216 217 ifp->if_flags &= ~IFF_OACTIVE; 218 splx(s); 219 } 220 221 static void 222 virtif_stop(struct ifnet *ifp, int disable) 223 { 224 225 panic("%s: unimpl", __func__); 226 } 227 228 static void 229 virtif_worker(void *arg) 230 { 231 struct ifnet *ifp = arg; 232 struct virtif_sc *sc = ifp->if_softc; 233 struct mbuf *m; 234 size_t plen = ETHER_MAX_LEN_JUMBO+1; 235 ssize_t n; 236 int error; 237 238 for (;;) { 239 m = m_gethdr(M_WAIT, MT_DATA); 240 MEXTMALLOC(m, plen, M_WAIT); 241 242 n = rumpuser_read(sc->sc_tapfd, mtod(m, void *), plen, &error); 243 KASSERT(n < ETHER_MAX_LEN_JUMBO); 244 if (n <= 0) { 245 m_freem(m); 246 break; 247 } 248 m->m_len = m->m_pkthdr.len = n; 249 m->m_pkthdr.rcvif = ifp; 250 ether_input(ifp, m); 251 } 252 253 panic("virtif_workin is a lazy boy %d\n", error); 254 } 255