1 /* $NetBSD: if_virt.c,v 1.4 2008/10/16 09:25:30 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/fcntl.h> 31 #include <sys/kmem.h> 32 #include <sys/kthread.h> 33 #include <sys/mutex.h> 34 #include <sys/sockio.h> 35 #include <sys/socketvar.h> 36 37 #include <net/if.h> 38 #include <net/if_ether.h> 39 #include <net/if_tap.h> 40 41 #include <netinet/in.h> 42 #include <netinet/in_var.h> 43 44 #include <rump/rump.h> 45 #include <rump/rumpuser.h> 46 47 #include "rump_private.h" 48 49 /* 50 * Virtual interface for userspace purposes. Uses tap(4) to 51 * interface with the kernel and just simply shovels data 52 * to/from /dev/tap. 53 */ 54 55 #define VIRTIF_BASE "virt" 56 static int nunits; 57 58 static int virtif_init(struct ifnet *); 59 static int virtif_ioctl(struct ifnet *, u_long, void *); 60 static void virtif_start(struct ifnet *); 61 static void virtif_stop(struct ifnet *, int); 62 63 struct virtif_sc { 64 struct ifnet sc_if; 65 char sc_tapname[IFNAMSIZ]; 66 int sc_tapfd; 67 }; 68 69 static int virtif_create(struct ifaliasreq *, struct ifnet **); 70 static void virtif_worker(void *); 71 72 /* XXXXX: this prototype needs to go elsewhere */ 73 int rump_virtif_create(struct ifaliasreq *, struct ifnet **); 74 int 75 rump_virtif_create(struct ifaliasreq *ia, struct ifnet **ifpp) 76 { 77 78 return virtif_create(ia, ifpp); 79 } 80 81 /* 82 * Create a socket and call ifioctl() to configure the interface. 83 * This trickles down to virtif_ioctl(). 84 */ 85 static int 86 configaddr(struct ifnet *ifp, struct ifaliasreq *ia) 87 { 88 struct socket *so; 89 int error; 90 91 strcpy(ia->ifra_name, ifp->if_xname); 92 error = socreate(ia->ifra_addr.sa_family, &so, SOCK_DGRAM, 93 0, curlwp, NULL); 94 if (error) 95 return error; 96 error = ifioctl(so, SIOCAIFADDR, ia, curlwp); 97 soclose(so); 98 99 return error; 100 } 101 102 static int 103 virtif_create(struct ifaliasreq *ia, struct ifnet **ifpp) 104 { 105 struct virtif_sc *sc; 106 struct ifreq ifr; 107 struct ifnet *ifp; 108 uint8_t enaddr[ETHER_ADDR_LEN] = { 0xb2, 0x0a, 0x00, 0x0b, 0x0e, 0x01 }; 109 int fd, rv, error; 110 int mynum; 111 112 /* 113 * XXX: this is currently un-sane. Need to figure out a way 114 * to configure this with a bridge into a sane network without 115 * hardcoding it. 116 */ 117 fd = rumpuser_open("/dev/tap0", O_RDWR, &error); 118 if (fd == -1) { 119 printf("virtif_create: can't open /dev/tap %d\n", error); 120 return error; 121 } 122 123 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 124 rv = rumpuser_ioctl(fd, TAPGIFNAME, &ifr, &error); 125 if (rv == -1) { 126 kmem_free(sc, sizeof(*sc)); 127 return error; 128 } 129 strlcpy(sc->sc_tapname, ifr.ifr_name, IFNAMSIZ); 130 sc->sc_tapfd = fd; 131 132 ifp = &sc->sc_if; 133 mynum = nunits++; 134 sprintf(ifp->if_xname, "%s%d", VIRTIF_BASE, mynum); 135 ifp->if_softc = sc; 136 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 137 ifp->if_init = virtif_init; 138 ifp->if_ioctl = virtif_ioctl; 139 ifp->if_start = virtif_start; 140 ifp->if_stop = virtif_stop; 141 142 if (rump_threads) { 143 rv = kthread_create(PRI_NONE, 0, NULL, virtif_worker, ifp, 144 NULL, "virtifi"); 145 if (rv) { 146 kmem_free(sc, sizeof(*sc)); 147 return rv; 148 } 149 } else { 150 printf("WARNING: threads not enabled, receive NOT working\n"); 151 } 152 153 if_attach(ifp); 154 ether_ifattach(ifp, enaddr); 155 156 if (ia) 157 configaddr(ifp, ia); 158 if (ifpp) 159 *ifpp = ifp; 160 161 return 0; 162 } 163 164 static int 165 virtif_init(struct ifnet *ifp) 166 { 167 168 ifp->if_flags |= IFF_RUNNING; 169 170 return 0; 171 } 172 173 static int 174 virtif_ioctl(struct ifnet *ifp, u_long cmd, void *data) 175 { 176 int s, rv; 177 178 s = splnet(); 179 rv = ether_ioctl(ifp, cmd, data); 180 splx(s); 181 182 return rv; 183 } 184 185 /* just send everything in-context */ 186 static void 187 virtif_start(struct ifnet *ifp) 188 { 189 struct virtif_sc *sc = ifp->if_softc; 190 struct iovec io[16]; 191 struct mbuf *m, *m0; 192 int s, i, error; 193 194 s = splnet(); 195 for (;;) { 196 IF_DEQUEUE(&ifp->if_snd, m0); 197 if (!m0) 198 break; 199 splx(s); 200 201 m = m0; 202 for (i = 0; i < 16 && m; i++) { 203 io[i].iov_base = mtod(m, void *); 204 io[i].iov_len = m->m_len; 205 m = m->m_next; 206 } 207 if (i == 16) 208 panic("lazy bum"); 209 rumpuser_writev(sc->sc_tapfd, io, i, &error); 210 m_freem(m0); 211 s = splnet(); 212 } 213 214 ifp->if_flags &= ~IFF_OACTIVE; 215 splx(s); 216 } 217 218 static void 219 virtif_stop(struct ifnet *ifp, int disable) 220 { 221 222 panic("%s: unimpl", __func__); 223 } 224 225 static void 226 virtif_worker(void *arg) 227 { 228 struct ifnet *ifp = arg; 229 struct virtif_sc *sc = ifp->if_softc; 230 struct mbuf *m; 231 size_t plen = ETHER_MAX_LEN_JUMBO+1; 232 ssize_t n; 233 int error; 234 235 for (;;) { 236 m = m_gethdr(M_WAIT, MT_DATA); 237 MEXTMALLOC(m, plen, M_WAIT); 238 239 n = rumpuser_read(sc->sc_tapfd, mtod(m, void *), plen, &error); 240 KASSERT(n < ETHER_MAX_LEN_JUMBO); 241 if (n <= 0) { 242 m_freem(m); 243 break; 244 } 245 m->m_len = m->m_pkthdr.len = n; 246 m->m_pkthdr.rcvif = ifp; 247 ether_input(ifp, m); 248 } 249 250 panic("virtif_workin is a lazy boy %d\n", error); 251 } 252