if_srt.c revision 1.7
1 /* $NetBSD: if_srt.c,v 1.7 2008/02/07 01:22:02 dyoung Exp $ */ 2 /* This file is in the public domain. */ 3 4 #include <sys/cdefs.h> 5 __KERNEL_RCSID(0, "$NetBSD: if_srt.c,v 1.7 2008/02/07 01:22:02 dyoung Exp $"); 6 7 #include "opt_inet.h" 8 9 #if !defined(INET) && !defined(INET6) 10 #error "srt without INET/INET6?" 11 #endif 12 13 #ifndef SRT_MAXUNIT 14 #define SRT_MAXUNIT 255 15 #endif 16 17 /* include-file bug workarounds */ 18 #include <sys/types.h> /* sys/conf.h */ 19 #include <sys/resource.h> /* sys/resourcevar.h (uvm/uvm_param.h, sys/mbuf.h) */ 20 #include <netinet/in.h> /* netinet/ip.h */ 21 #include <sys/param.h> /* sys/mbuf.h */ 22 #include <netinet/in_systm.h> /* netinet/ip.h */ 23 24 #include <sys/conf.h> 25 #include <sys/mbuf.h> 26 #include <sys/errno.h> 27 #include <sys/fcntl.h> 28 #include <sys/param.h> 29 #include <sys/ioctl.h> 30 #include <netinet/ip.h> 31 #include <netinet/ip6.h> 32 #include <net/if_types.h> 33 #include <machine/stdarg.h> 34 35 #include "if_srt.h" 36 #include "bpfilter.h" 37 38 /* until we know what to pass to bpfattach.... */ 39 #undef NBPFILTER 40 #define NBPFILTER 0 41 42 typedef struct srt_rt RT; 43 typedef struct softc SOFTC; 44 45 struct softc { 46 struct ifnet intf; /* XXX interface botch */ 47 int unit; 48 int nrt; 49 RT **rts; 50 unsigned int flags; /* SSF_* values from if_srt.h */ 51 #define SSF_UCHG (SSF_MTULOCK) /* userland-changeable bits */ 52 unsigned int kflags; /* bits private to this file */ 53 #define SKF_CDEVOPEN 0x00000001 54 } ; 55 56 static SOFTC *softcv[SRT_MAXUNIT+1]; 57 static unsigned int global_flags; 58 59 /* Internal routines. */ 60 61 static unsigned int ipv4_masks[33] 62 = { 0x00000000, /* /0 */ 63 0x80000000, 0xc0000000, 0xe0000000, 0xf0000000, /* /1 - /4 */ 64 0xf8000000, 0xfc000000, 0xfe000000, 0xff000000, /* /5 - /8 */ 65 0xff800000, 0xffc00000, 0xffe00000, 0xfff00000, /* /9 - /12 */ 66 0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000, /* /13 - /16 */ 67 0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000, /* /17 - /20 */ 68 0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00, /* /21 - /24 */ 69 0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0, /* /25 - /28 */ 70 0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff /* /29 - /32 */ }; 71 72 static void update_mtu(SOFTC *sc) 73 { 74 int mtu; 75 int i; 76 RT *r; 77 78 if (sc->flags & SSF_MTULOCK) return; 79 mtu = 65535; 80 for (i=sc->nrt-1;i>=0;i--) 81 { r = sc->rts[i]; 82 if (r->u.dstifp->if_mtu < mtu) mtu = r->u.dstifp->if_mtu; 83 } 84 sc->intf.if_mtu = mtu; 85 } 86 87 static RT *find_rt(SOFTC *sc, int af, ...) 88 { 89 int i; 90 RT *r; 91 struct in_addr ia; 92 struct in6_addr ia6; 93 va_list ap; 94 95 ia.s_addr = 0; ia6.s6_addr[0] = 0; /* shut up incorrect -Wuninitialized */ 96 va_start(ap,af); 97 switch (af) 98 { case AF_INET: 99 ia = va_arg(ap,struct in_addr); 100 break; 101 case AF_INET6: 102 ia6 = va_arg(ap,struct in6_addr); 103 break; 104 default: 105 panic("if_srt find_rt: impossible address family"); 106 break; 107 } 108 va_end(ap); 109 for (i=0;i<sc->nrt;i++) 110 { r = sc->rts[i]; 111 if (r->af != af) continue; 112 switch (af) 113 { case AF_INET: 114 if ((ia.s_addr & ipv4_masks[r->srcmask]) == r->srcmatch.v4.s_addr) return(r); 115 break; 116 case AF_INET6: 117 if ((r->srcmask >= 8) && bcmp(&ia6,&r->srcmatch.v6,r->srcmask/8)) continue; 118 if ( (r->srcmask % 8) && 119 ( ( ia6.s6_addr[r->srcmask/8] ^ 120 r->srcmatch.v6.s6_addr[r->srcmask/8] ) & 121 0xff & (0xff00 >> (r->srcmask%8)) ) ) continue; 122 return(r); 123 break; 124 default: 125 panic("if_srt find_rt: impossible address family 2"); 126 break; 127 } 128 } 129 return(0); 130 } 131 132 /* Network device interface. */ 133 134 static int srt_if_ioctl(struct ifnet *intf, u_long cmd, void *data) 135 { 136 struct ifaddr *ifa; 137 int s; 138 int err; 139 140 err = 0; 141 s = splnet(); 142 switch (cmd) 143 { case SIOCSIFADDR: 144 case SIOCSIFDSTADDR: 145 ifa = (void *) data; 146 switch (ifa->ifa_addr->sa_family) 147 { 148 #ifdef INET 149 case AF_INET: 150 #endif 151 #ifdef INET6 152 case AF_INET6: 153 #endif 154 break; 155 default: 156 err = EAFNOSUPPORT; 157 break; 158 } 159 /* XXX do we need to do more here for either of these? */ 160 break; 161 case SIOCSIFMTU: 162 case SIOCGIFMTU: 163 if ((err = ifioctl_common(intf, cmd, data)) == ENETRESET) 164 err = 0; 165 break; 166 default: 167 err = EINVAL; 168 break; 169 } 170 splx(s); 171 return(err); 172 } 173 174 static int srt_if_output( 175 struct ifnet *intf, 176 struct mbuf *m, 177 const struct sockaddr *to, 178 struct rtentry *rtp ) 179 { 180 SOFTC *sc; 181 RT *r; 182 183 sc = intf->if_softc; 184 if (! (intf->if_flags & IFF_UP)) 185 { m_freem(m); 186 return(ENETDOWN); 187 } 188 switch (to->sa_family) 189 { 190 #ifdef INET 191 case AF_INET: 192 #endif 193 { struct ip *ip; 194 ip = mtod(m,struct ip *); 195 r = find_rt(sc,AF_INET,ip->ip_src); 196 } 197 break; 198 #ifdef INET6 199 case AF_INET6: 200 #endif 201 { struct ip6_hdr *ip; 202 ip = mtod(m,struct ip6_hdr *); 203 r = find_rt(sc,AF_INET6,ip->ip6_src); 204 } 205 break; 206 default: 207 IF_DROP(&intf->if_snd); 208 m_freem(m); 209 return(EAFNOSUPPORT); 210 break; 211 } 212 /* XXX Do we need to bpf_tap? Or do higher layers now handle that? */ 213 /* if_gif.c seems to imply the latter. */ 214 intf->if_opackets ++; 215 if (! r) 216 { intf->if_oerrors ++; 217 m_freem(m); 218 return(0); 219 } 220 if (! (m->m_flags & M_PKTHDR)) 221 { printf("srt_if_output no PKTHDR\n"); 222 m_freem(m); 223 return(0); 224 } 225 intf->if_obytes += m->m_pkthdr.len; 226 if (! (r->u.dstifp->if_flags & IFF_UP)) 227 { m_freem(m); 228 return(0); /* XXX ENETDOWN? */ 229 } 230 /* XXX is 0 the right last arg here? */ 231 return((*r->u.dstifp->if_output)(r->u.dstifp,m,&r->dst.sa,0)); 232 } 233 234 static int srt_clone_create(struct if_clone *cl, int unit) 235 { 236 SOFTC *sc; 237 238 if ((unit < 0) || (unit > SRT_MAXUNIT)) return(ENXIO); 239 if (softcv[unit]) return(EBUSY); 240 sc = malloc(sizeof(SOFTC),M_DEVBUF,M_WAIT); 241 bzero(&sc->intf,sizeof(sc->intf)); /* XXX */ 242 sc->unit = unit; 243 sc->nrt = 0; 244 sc->rts = 0; 245 sc->flags = 0; 246 sc->kflags = 0; 247 snprintf(&sc->intf.if_xname[0],sizeof(sc->intf.if_xname),"%s%d",cl->ifc_name,unit); 248 sc->intf.if_softc = sc; 249 sc->intf.if_mtu = 65535; 250 sc->intf.if_flags = IFF_POINTOPOINT; 251 sc->intf.if_type = IFT_OTHER; 252 sc->intf.if_ioctl = &srt_if_ioctl; 253 sc->intf.if_output = &srt_if_output; 254 sc->intf.if_dlt = DLT_RAW; 255 if_attach(&sc->intf); 256 if_alloc_sadl(&sc->intf); 257 #if NBPFILTER > 0 /* see comment near top */ 258 bpfattach(&sc->intf,0/*???*/,0/*???*/); 259 #endif 260 softcv[unit] = sc; 261 return(0); 262 } 263 264 static int srt_clone_destroy(struct ifnet *intf) 265 { 266 SOFTC *sc; 267 268 sc = intf->if_softc; 269 if ((intf->if_flags & IFF_UP) || (sc->kflags & SKF_CDEVOPEN)) return(EBUSY); 270 #if NBPFILTER > 0 271 bpfdetach(intf); 272 #endif 273 if_detach(intf); 274 if ((sc->unit < 0) || (sc->unit > SRT_MAXUNIT)) 275 { panic("srt_clone_destroy: impossible unit %d\n",sc->unit); 276 } 277 if (softcv[sc->unit] != sc) 278 { panic("srt_clone_destroy: bad backpointer ([%d]=%p not %p)\n", 279 sc->unit,(void *)softcv[sc->unit],(void *)sc); 280 } 281 softcv[sc->unit] = 0; 282 free(sc,M_DEVBUF); 283 return(0); 284 } 285 286 struct if_clone srt_clone = 287 IF_CLONE_INITIALIZER("srt",&srt_clone_create,&srt_clone_destroy); 288 289 extern void srtattach(void); 290 void srtattach(void) 291 { 292 int i; 293 294 for (i=SRT_MAXUNIT;i>=0;i--) softcv[i] = 0; 295 global_flags = 0; 296 if_clone_attach(&srt_clone); 297 } 298 299 /* Special-device interface. */ 300 301 static int srt_open(dev_t dev, int flag, int mode, struct lwp *l) 302 { 303 int unit; 304 SOFTC *sc; 305 306 unit = minor(dev); 307 if ((unit < 0) || (unit > SRT_MAXUNIT)) return(ENXIO); 308 sc = softcv[unit]; 309 if (! sc) return(ENXIO); 310 sc->kflags |= SKF_CDEVOPEN; 311 return(0); 312 } 313 314 static int srt_close(dev_t dev, int flag, int mode, struct lwp *l) 315 { 316 int unit; 317 SOFTC *sc; 318 319 unit = minor(dev); 320 if ((unit < 0) || (unit > SRT_MAXUNIT)) return(ENXIO); 321 sc = softcv[unit]; 322 if (! sc) return(ENXIO); 323 sc->kflags &= ~SKF_CDEVOPEN; 324 return(0); 325 } 326 327 static int srt_ioctl( 328 dev_t dev, 329 u_long cmd, 330 void *data, 331 int flag, 332 struct lwp *l ) 333 { 334 SOFTC *sc; 335 RT *dr; 336 RT *scr; 337 struct ifnet *intf; 338 char nbuf[IFNAMSIZ]; 339 340 sc = softcv[minor(dev)]; 341 if (! sc) panic("srt_ioctl: softc disappeared"); 342 switch (cmd) 343 { case SRT_GETNRT: 344 if (! (flag & FREAD)) return(EBADF); 345 *(unsigned int *)data = sc->nrt; 346 return(0); 347 break; 348 case SRT_GETRT: 349 if (! (flag & FREAD)) return(EBADF); 350 dr = (RT *) data; 351 if (dr->inx >= sc->nrt) return(EDOM); 352 scr = sc->rts[dr->inx]; 353 dr->af = scr->af; 354 dr->srcmatch = scr->srcmatch; 355 dr->srcmask = scr->srcmask; 356 strncpy(&dr->u.dstifn[0],&scr->u.dstifp->if_xname[0],IFNAMSIZ); 357 memcpy(&dr->dst,&scr->dst,scr->dst.sa.sa_len); 358 return(0); 359 break; 360 case SRT_SETRT: 361 if (! (flag & FWRITE)) return(EBADF); 362 dr = (RT *) data; 363 if (dr->inx > sc->nrt) return(EDOM); 364 strncpy(&nbuf[0],&dr->u.dstifn[0],IFNAMSIZ); 365 nbuf[IFNAMSIZ-1] = '\0'; 366 if (dr->dst.sa.sa_family != dr->af) return(EIO); 367 switch (dr->af) 368 { 369 #ifdef INET 370 case AF_INET: 371 if (dr->dst.sa.sa_len != sizeof(dr->dst.sin)) return(EIO); 372 if (dr->srcmask > 32) return(EIO); 373 break; 374 #endif 375 #ifdef INET6 376 case AF_INET6: 377 if (dr->dst.sa.sa_len != sizeof(dr->dst.sin6)) return(EIO); 378 if (dr->srcmask > 128) return(EIO); 379 break; 380 #endif 381 break; 382 default: 383 return(EAFNOSUPPORT); 384 break; 385 } 386 intf = ifunit(&nbuf[0]); 387 if (intf == 0) return(ENXIO); /* needs translation */ 388 if (dr->inx == sc->nrt) 389 { RT **tmp; 390 tmp = malloc((sc->nrt+1)*sizeof(*tmp),M_DEVBUF,M_WAITOK); 391 if (tmp == 0) return(ENOBUFS); 392 tmp[sc->nrt] = 0; 393 if (sc->nrt > 0) 394 { memcpy(tmp,sc->rts,sc->nrt*sizeof(*tmp)); 395 free(sc->rts,M_DEVBUF); 396 } 397 sc->rts = tmp; 398 sc->nrt ++; 399 } 400 scr = sc->rts[dr->inx]; 401 if (scr == 0) 402 { scr = malloc(sizeof(RT),M_DEVBUF,M_WAITOK); 403 if (scr == 0) return(ENOBUFS); 404 scr->inx = dr->inx; 405 scr->af = AF_UNSPEC; 406 sc->rts[dr->inx] = scr; 407 } 408 scr->af = dr->af; 409 scr->srcmatch = dr->srcmatch; 410 scr->srcmask = dr->srcmask; 411 scr->u.dstifp = intf; 412 memcpy(&scr->dst,&dr->dst,dr->dst.sa.sa_len); 413 update_mtu(sc); 414 return(0); 415 break; 416 case SRT_DELRT: 417 { unsigned int i; 418 if (! (flag & FWRITE)) return(EBADF); 419 i = *(unsigned int *)data; 420 if (i >= sc->nrt) return(EDOM); 421 scr = sc->rts[i]; 422 sc->rts[i] = 0; 423 free(scr,M_DEVBUF); 424 sc->nrt --; 425 if (i < sc->nrt) memcpy(sc->rts+i,sc->rts+i+1,(sc->nrt-i)*sizeof(*sc->rts)); 426 if (sc->nrt == 0) 427 { free(sc->rts,M_DEVBUF); 428 sc->rts = 0; 429 sc->intf.if_flags &= ~IFF_UP; 430 } 431 } 432 update_mtu(sc); 433 return(0); 434 break; 435 case SRT_SFLAGS: 436 { unsigned int f; 437 if (! (flag & FWRITE)) return(EBADF); 438 f = *(unsigned int *)data & SSF_UCHG; 439 global_flags = (global_flags & ~SSF_UCHG) | (f & SSF_GLOBAL); 440 sc->flags = (sc->flags & ~SSF_UCHG) | (f & ~SSF_GLOBAL); 441 } 442 return(0); 443 break; 444 case SRT_GFLAGS: 445 if (! (flag & FREAD)) return(EBADF); 446 *(unsigned int *)data = sc->flags | global_flags; 447 return(0); 448 break; 449 case SRT_SGFLAGS: 450 { unsigned int o; 451 unsigned int n; 452 if ((flag & (FWRITE|FREAD)) != (FWRITE|FREAD)) return(EBADF); 453 o = sc->flags | global_flags; 454 n = *(unsigned int *)data & SSF_UCHG; 455 global_flags = (global_flags & ~SSF_UCHG) | (n & SSF_GLOBAL); 456 sc->flags = (sc->flags & ~SSF_UCHG) | (n & ~SSF_GLOBAL); 457 *(unsigned int *)data = o; 458 } 459 return(0); 460 break; 461 case SRT_DEBUG: 462 return(0); 463 break; 464 } 465 return(ENOTTY); 466 } 467 468 const struct cdevsw srt_cdevsw 469 = { &srt_open, 470 &srt_close, 471 nullread, 472 nullwrite, 473 &srt_ioctl, 474 nullstop, 475 notty, 476 nullpoll, 477 nommap, 478 nullkqfilter, 479 D_OTHER }; 480
Indexes created Fri Oct 03 02:09:57 GMT 2025