Index: head/sbin/ifconfig/ifconfig.c =================================================================== --- head/sbin/ifconfig/ifconfig.c (revision 206636) +++ head/sbin/ifconfig/ifconfig.c (revision 206637) @@ -1,1179 +1,1180 @@ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1983, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)ifconfig.c 8.2 (Berkeley) 2/16/94"; #endif static const char rcsid[] = "$FreeBSD$"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include /* IP */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ifconfig.h" /* * Since "struct ifreq" is composed of various union members, callers * should pay special attention to interprete the value. * (.e.g. little/big endian difference in the structure.) */ struct ifreq ifr; char name[IFNAMSIZ]; char *descr = NULL; size_t descrlen = 64; int setaddr; int setmask; int doalias; int clearaddr; int newaddr = 1; int verbose; int noload; int supmedia = 0; int printkeys = 0; /* Print keying material for interfaces. */ static int ifconfig(int argc, char *const *argv, int iscreate, const struct afswtch *afp); static void status(const struct afswtch *afp, const struct sockaddr_dl *sdl, struct ifaddrs *ifa); static void tunnel_status(int s); static void usage(void); static struct afswtch *af_getbyname(const char *name); static struct afswtch *af_getbyfamily(int af); static void af_other_status(int); static struct option *opts = NULL; void opt_register(struct option *p) { p->next = opts; opts = p; } static void usage(void) { char options[1024]; struct option *p; /* XXX not right but close enough for now */ options[0] = '\0'; for (p = opts; p != NULL; p = p->next) { strlcat(options, p->opt_usage, sizeof(options)); strlcat(options, " ", sizeof(options)); } fprintf(stderr, "usage: ifconfig %sinterface address_family [address [dest_address]]\n" " [parameters]\n" " ifconfig interface create\n" " ifconfig -a %s[-d] [-m] [-u] [-v] [address_family]\n" " ifconfig -l [-d] [-u] [address_family]\n" " ifconfig %s[-d] [-m] [-u] [-v]\n", options, options, options); exit(1); } int main(int argc, char *argv[]) { int c, all, namesonly, downonly, uponly; const struct afswtch *afp = NULL; int ifindex; struct ifaddrs *ifap, *ifa; struct ifreq paifr; const struct sockaddr_dl *sdl; char options[1024], *cp, *namecp = NULL; const char *ifname; struct option *p; size_t iflen; all = downonly = uponly = namesonly = noload = verbose = 0; /* Parse leading line options */ strlcpy(options, "adklmnuv", sizeof(options)); for (p = opts; p != NULL; p = p->next) strlcat(options, p->opt, sizeof(options)); while ((c = getopt(argc, argv, options)) != -1) { switch (c) { case 'a': /* scan all interfaces */ all++; break; case 'd': /* restrict scan to "down" interfaces */ downonly++; break; case 'k': printkeys++; break; case 'l': /* scan interface names only */ namesonly++; break; case 'm': /* show media choices in status */ supmedia = 1; break; case 'n': /* suppress module loading */ noload++; break; case 'u': /* restrict scan to "up" interfaces */ uponly++; break; case 'v': verbose++; break; default: for (p = opts; p != NULL; p = p->next) if (p->opt[0] == c) { p->cb(optarg); break; } if (p == NULL) usage(); break; } } argc -= optind; argv += optind; /* -l cannot be used with -a or -m */ if (namesonly && (all || supmedia)) usage(); /* nonsense.. */ if (uponly && downonly) usage(); /* no arguments is equivalent to '-a' */ if (!namesonly && argc < 1) all = 1; /* -a and -l allow an address family arg to limit the output */ if (all || namesonly) { if (argc > 1) usage(); ifname = NULL; ifindex = 0; if (argc == 1) { afp = af_getbyname(*argv); if (afp == NULL) usage(); if (afp->af_name != NULL) argc--, argv++; /* leave with afp non-zero */ } } else { /* not listing, need an argument */ if (argc < 1) usage(); ifname = *argv; argc--, argv++; /* check and maybe load support for this interface */ ifmaybeload(ifname); ifindex = if_nametoindex(ifname); if (ifindex == 0) { /* * NOTE: We must special-case the `create' command * right here as we would otherwise fail when trying * to find the interface. */ if (argc > 0 && (strcmp(argv[0], "create") == 0 || strcmp(argv[0], "plumb") == 0)) { iflen = strlcpy(name, ifname, sizeof(name)); if (iflen >= sizeof(name)) errx(1, "%s: cloning name too long", ifname); ifconfig(argc, argv, 1, NULL); exit(0); } /* * NOTE: We have to special-case the `-vnet' command * right here as we would otherwise fail when trying * to find the interface as it lives in another vnet. */ if (argc > 0 && (strcmp(argv[0], "-vnet") == 0)) { iflen = strlcpy(name, ifname, sizeof(name)); if (iflen >= sizeof(name)) errx(1, "%s: interface name too long", ifname); ifconfig(argc, argv, 0, NULL); exit(0); } errx(1, "interface %s does not exist", ifname); } } /* Check for address family */ if (argc > 0) { afp = af_getbyname(*argv); if (afp != NULL) argc--, argv++; } if (getifaddrs(&ifap) != 0) err(EXIT_FAILURE, "getifaddrs"); cp = NULL; ifindex = 0; for (ifa = ifap; ifa; ifa = ifa->ifa_next) { memset(&paifr, 0, sizeof(paifr)); strncpy(paifr.ifr_name, ifa->ifa_name, sizeof(paifr.ifr_name)); if (sizeof(paifr.ifr_addr) >= ifa->ifa_addr->sa_len) { memcpy(&paifr.ifr_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len); } if (ifname != NULL && strcmp(ifname, ifa->ifa_name) != 0) continue; if (ifa->ifa_addr->sa_family == AF_LINK) sdl = (const struct sockaddr_dl *) ifa->ifa_addr; else sdl = NULL; if (cp != NULL && strcmp(cp, ifa->ifa_name) == 0 && !namesonly) continue; iflen = strlcpy(name, ifa->ifa_name, sizeof(name)); if (iflen >= sizeof(name)) { warnx("%s: interface name too long, skipping", ifa->ifa_name); continue; } cp = ifa->ifa_name; if (downonly && (ifa->ifa_flags & IFF_UP) != 0) continue; if (uponly && (ifa->ifa_flags & IFF_UP) == 0) continue; /* * Are we just listing the interfaces? */ if (namesonly) { if (namecp == cp) continue; if (afp != NULL) { /* special case for "ether" address family */ if (!strcmp(afp->af_name, "ether")) { if (sdl == NULL || sdl->sdl_type != IFT_ETHER || sdl->sdl_alen != ETHER_ADDR_LEN) continue; } else { if (ifa->ifa_addr->sa_family != afp->af_af) continue; } } namecp = cp; ifindex++; if (ifindex > 1) printf(" "); fputs(name, stdout); continue; } ifindex++; if (argc > 0) ifconfig(argc, argv, 0, afp); else status(afp, sdl, ifa); } if (namesonly) printf("\n"); freeifaddrs(ifap); exit(0); } static struct afswtch *afs = NULL; void af_register(struct afswtch *p) { p->af_next = afs; afs = p; } static struct afswtch * af_getbyname(const char *name) { struct afswtch *afp; for (afp = afs; afp != NULL; afp = afp->af_next) if (strcmp(afp->af_name, name) == 0) return afp; return NULL; } static struct afswtch * af_getbyfamily(int af) { struct afswtch *afp; for (afp = afs; afp != NULL; afp = afp->af_next) if (afp->af_af == af) return afp; return NULL; } static void af_other_status(int s) { struct afswtch *afp; uint8_t afmask[howmany(AF_MAX, NBBY)]; memset(afmask, 0, sizeof(afmask)); for (afp = afs; afp != NULL; afp = afp->af_next) { if (afp->af_other_status == NULL) continue; if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af)) continue; afp->af_other_status(s); setbit(afmask, afp->af_af); } } static void af_all_tunnel_status(int s) { struct afswtch *afp; uint8_t afmask[howmany(AF_MAX, NBBY)]; memset(afmask, 0, sizeof(afmask)); for (afp = afs; afp != NULL; afp = afp->af_next) { if (afp->af_status_tunnel == NULL) continue; if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af)) continue; afp->af_status_tunnel(s); setbit(afmask, afp->af_af); } } static struct cmd *cmds = NULL; void cmd_register(struct cmd *p) { p->c_next = cmds; cmds = p; } static const struct cmd * cmd_lookup(const char *name, int iscreate) { #define N(a) (sizeof(a)/sizeof(a[0])) const struct cmd *p; for (p = cmds; p != NULL; p = p->c_next) if (strcmp(name, p->c_name) == 0) { if (iscreate) { if (p->c_iscloneop) return p; } else { if (!p->c_iscloneop) return p; } } return NULL; #undef N } struct callback { callback_func *cb_func; void *cb_arg; struct callback *cb_next; }; static struct callback *callbacks = NULL; void callback_register(callback_func *func, void *arg) { struct callback *cb; cb = malloc(sizeof(struct callback)); if (cb == NULL) errx(1, "unable to allocate memory for callback"); cb->cb_func = func; cb->cb_arg = arg; cb->cb_next = callbacks; callbacks = cb; } /* specially-handled commands */ static void setifaddr(const char *, int, int, const struct afswtch *); static const struct cmd setifaddr_cmd = DEF_CMD("ifaddr", 0, setifaddr); static void setifdstaddr(const char *, int, int, const struct afswtch *); static const struct cmd setifdstaddr_cmd = DEF_CMD("ifdstaddr", 0, setifdstaddr); static int ifconfig(int argc, char *const *argv, int iscreate, const struct afswtch *uafp) { const struct afswtch *afp, *nafp; const struct cmd *p; struct callback *cb; int s; strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name); afp = uafp != NULL ? uafp : af_getbyname("inet"); top: ifr.ifr_addr.sa_family = afp->af_af == AF_LINK || afp->af_af == AF_UNSPEC ? AF_LOCAL : afp->af_af; if ((s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0)) < 0 && (uafp != NULL || errno != EPROTONOSUPPORT || (s = socket(AF_LOCAL, SOCK_DGRAM, 0)) < 0)) err(1, "socket(family %u,SOCK_DGRAM", ifr.ifr_addr.sa_family); while (argc > 0) { p = cmd_lookup(*argv, iscreate); if (iscreate && p == NULL) { /* * Push the clone create callback so the new * device is created and can be used for any * remaining arguments. */ cb = callbacks; if (cb == NULL) errx(1, "internal error, no callback"); callbacks = cb->cb_next; cb->cb_func(s, cb->cb_arg); iscreate = 0; /* * Handle any address family spec that * immediately follows and potentially * recreate the socket. */ nafp = af_getbyname(*argv); if (nafp != NULL) { argc--, argv++; if (nafp != afp) { close(s); afp = nafp; goto top; } } /* * Look for a normal parameter. */ continue; } if (p == NULL) { /* * Not a recognized command, choose between setting * the interface address and the dst address. */ p = (setaddr ? &setifdstaddr_cmd : &setifaddr_cmd); } if (p->c_u.c_func || p->c_u.c_func2) { if (p->c_parameter == NEXTARG) { if (argv[1] == NULL) errx(1, "'%s' requires argument", p->c_name); p->c_u.c_func(argv[1], 0, s, afp); argc--, argv++; } else if (p->c_parameter == OPTARG) { p->c_u.c_func(argv[1], 0, s, afp); if (argv[1] != NULL) argc--, argv++; } else if (p->c_parameter == NEXTARG2) { if (argc < 3) errx(1, "'%s' requires 2 arguments", p->c_name); p->c_u.c_func2(argv[1], argv[2], s, afp); argc -= 2, argv += 2; } else p->c_u.c_func(*argv, p->c_parameter, s, afp); } argc--, argv++; } /* * Do any post argument processing required by the address family. */ if (afp->af_postproc != NULL) afp->af_postproc(s, afp); /* * Do deferred callbacks registered while processing * command-line arguments. */ for (cb = callbacks; cb != NULL; cb = cb->cb_next) cb->cb_func(s, cb->cb_arg); /* * Do deferred operations. */ if (clearaddr) { if (afp->af_ridreq == NULL || afp->af_difaddr == 0) { warnx("interface %s cannot change %s addresses!", name, afp->af_name); clearaddr = 0; } } if (clearaddr) { int ret; strncpy(afp->af_ridreq, name, sizeof ifr.ifr_name); ret = ioctl(s, afp->af_difaddr, afp->af_ridreq); if (ret < 0) { if (errno == EADDRNOTAVAIL && (doalias >= 0)) { /* means no previous address for interface */ } else Perror("ioctl (SIOCDIFADDR)"); } } if (newaddr) { if (afp->af_addreq == NULL || afp->af_aifaddr == 0) { warnx("interface %s cannot change %s addresses!", name, afp->af_name); newaddr = 0; } } if (newaddr && (setaddr || setmask)) { strncpy(afp->af_addreq, name, sizeof ifr.ifr_name); if (ioctl(s, afp->af_aifaddr, afp->af_addreq) < 0) Perror("ioctl (SIOCAIFADDR)"); } close(s); return(0); } /*ARGSUSED*/ static void setifaddr(const char *addr, int param, int s, const struct afswtch *afp) { if (afp->af_getaddr == NULL) return; /* * Delay the ioctl to set the interface addr until flags are all set. * The address interpretation may depend on the flags, * and the flags may change when the address is set. */ setaddr++; if (doalias == 0 && afp->af_af != AF_LINK) clearaddr = 1; afp->af_getaddr(addr, (doalias >= 0 ? ADDR : RIDADDR)); } static void settunnel(const char *src, const char *dst, int s, const struct afswtch *afp) { struct addrinfo *srcres, *dstres; int ecode; if (afp->af_settunnel == NULL) { warn("address family %s does not support tunnel setup", afp->af_name); return; } if ((ecode = getaddrinfo(src, NULL, NULL, &srcres)) != 0) errx(1, "error in parsing address string: %s", gai_strerror(ecode)); if ((ecode = getaddrinfo(dst, NULL, NULL, &dstres)) != 0) errx(1, "error in parsing address string: %s", gai_strerror(ecode)); if (srcres->ai_addr->sa_family != dstres->ai_addr->sa_family) errx(1, "source and destination address families do not match"); afp->af_settunnel(s, srcres, dstres); freeaddrinfo(srcres); freeaddrinfo(dstres); } /* ARGSUSED */ static void deletetunnel(const char *vname, int param, int s, const struct afswtch *afp) { if (ioctl(s, SIOCDIFPHYADDR, &ifr) < 0) err(1, "SIOCDIFPHYADDR"); } static void setifvnet(const char *jname, int dummy __unused, int s, const struct afswtch *afp) { struct ifreq my_ifr; memcpy(&my_ifr, &ifr, sizeof(my_ifr)); my_ifr.ifr_jid = jail_getid(jname); if (my_ifr.ifr_jid < 0) errx(1, "%s", jail_errmsg); if (ioctl(s, SIOCSIFVNET, &my_ifr) < 0) err(1, "SIOCSIFVNET"); } static void setifrvnet(const char *jname, int dummy __unused, int s, const struct afswtch *afp) { struct ifreq my_ifr; memcpy(&my_ifr, &ifr, sizeof(my_ifr)); my_ifr.ifr_jid = jail_getid(jname); if (my_ifr.ifr_jid < 0) errx(1, "%s", jail_errmsg); if (ioctl(s, SIOCSIFRVNET, &my_ifr) < 0) err(1, "SIOCSIFRVNET(%d, %s)", my_ifr.ifr_jid, my_ifr.ifr_name); } static void setifnetmask(const char *addr, int dummy __unused, int s, const struct afswtch *afp) { if (afp->af_getaddr != NULL) { setmask++; afp->af_getaddr(addr, MASK); } } static void setifbroadaddr(const char *addr, int dummy __unused, int s, const struct afswtch *afp) { if (afp->af_getaddr != NULL) afp->af_getaddr(addr, DSTADDR); } static void setifipdst(const char *addr, int dummy __unused, int s, const struct afswtch *afp) { const struct afswtch *inet; inet = af_getbyname("inet"); if (inet == NULL) return; inet->af_getaddr(addr, DSTADDR); clearaddr = 0; newaddr = 0; } static void notealias(const char *addr, int param, int s, const struct afswtch *afp) { #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr)) if (setaddr && doalias == 0 && param < 0) if (afp->af_addreq != NULL && afp->af_ridreq != NULL) bcopy((caddr_t)rqtosa(af_addreq), (caddr_t)rqtosa(af_ridreq), rqtosa(af_addreq)->sa_len); doalias = param; if (param < 0) { clearaddr = 1; newaddr = 0; } else clearaddr = 0; #undef rqtosa } /*ARGSUSED*/ static void setifdstaddr(const char *addr, int param __unused, int s, const struct afswtch *afp) { if (afp->af_getaddr != NULL) afp->af_getaddr(addr, DSTADDR); } /* * Note: doing an SIOCIGIFFLAGS scribbles on the union portion * of the ifreq structure, which may confuse other parts of ifconfig. * Make a private copy so we can avoid that. */ static void setifflags(const char *vname, int value, int s, const struct afswtch *afp) { struct ifreq my_ifr; int flags; memset(&my_ifr, 0, sizeof(my_ifr)); (void) strlcpy(my_ifr.ifr_name, name, sizeof(my_ifr.ifr_name)); if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&my_ifr) < 0) { Perror("ioctl (SIOCGIFFLAGS)"); exit(1); } flags = (my_ifr.ifr_flags & 0xffff) | (my_ifr.ifr_flagshigh << 16); if (value < 0) { value = -value; flags &= ~value; } else flags |= value; my_ifr.ifr_flags = flags & 0xffff; my_ifr.ifr_flagshigh = flags >> 16; if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&my_ifr) < 0) Perror(vname); } void setifcap(const char *vname, int value, int s, const struct afswtch *afp) { int flags; if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) < 0) { Perror("ioctl (SIOCGIFCAP)"); exit(1); } flags = ifr.ifr_curcap; if (value < 0) { value = -value; flags &= ~value; } else flags |= value; flags &= ifr.ifr_reqcap; ifr.ifr_reqcap = flags; if (ioctl(s, SIOCSIFCAP, (caddr_t)&ifr) < 0) Perror(vname); } static void setifmetric(const char *val, int dummy __unused, int s, const struct afswtch *afp) { strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name)); ifr.ifr_metric = atoi(val); if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0) warn("ioctl (set metric)"); } static void setifmtu(const char *val, int dummy __unused, int s, const struct afswtch *afp) { strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name)); ifr.ifr_mtu = atoi(val); if (ioctl(s, SIOCSIFMTU, (caddr_t)&ifr) < 0) warn("ioctl (set mtu)"); } static void setifname(const char *val, int dummy __unused, int s, const struct afswtch *afp) { char *newname; newname = strdup(val); if (newname == NULL) { warn("no memory to set ifname"); return; } ifr.ifr_data = newname; if (ioctl(s, SIOCSIFNAME, (caddr_t)&ifr) < 0) { warn("ioctl (set name)"); free(newname); return; } strlcpy(name, newname, sizeof(name)); free(newname); } /* ARGSUSED */ static void setifdescr(const char *val, int dummy __unused, int s, const struct afswtch *afp) { char *newdescr; ifr.ifr_buffer.length = strlen(val) + 1; if (ifr.ifr_buffer.length == 1) { ifr.ifr_buffer.buffer = newdescr = NULL; ifr.ifr_buffer.length = 0; } else { newdescr = strdup(val); ifr.ifr_buffer.buffer = newdescr; if (newdescr == NULL) { warn("no memory to set ifdescr"); return; } } if (ioctl(s, SIOCSIFDESCR, (caddr_t)&ifr) < 0) warn("ioctl (set descr)"); free(newdescr); } /* ARGSUSED */ static void unsetifdescr(const char *val, int value, int s, const struct afswtch *afp) { setifdescr("", 0, s, 0); } #define IFFBITS \ "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6SMART\7RUNNING" \ "\10NOARP\11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2" \ "\20MULTICAST\22PPROMISC\23MONITOR\24STATICARP" #define IFCAPBITS \ "\020\1RXCSUM\2TXCSUM\3NETCONS\4VLAN_MTU\5VLAN_HWTAGGING\6JUMBO_MTU\7POLLING" \ "\10VLAN_HWCSUM\11TSO4\12TSO6\13LRO\14WOL_UCAST\15WOL_MCAST\16WOL_MAGIC" \ "\21VLAN_HWFILTER\23VLAN_HWTSO\24LINKSTATE" /* * Print the status of the interface. If an address family was * specified, show only it; otherwise, show them all. */ static void status(const struct afswtch *afp, const struct sockaddr_dl *sdl, struct ifaddrs *ifa) { struct ifaddrs *ift; int allfamilies, s; struct ifstat ifs; if (afp == NULL) { allfamilies = 1; ifr.ifr_addr.sa_family = AF_LOCAL; } else { allfamilies = 0; ifr.ifr_addr.sa_family = afp->af_af == AF_LINK ? AF_LOCAL : afp->af_af; } strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0); if (s < 0) err(1, "socket(family %u,SOCK_DGRAM)", ifr.ifr_addr.sa_family); printf("%s: ", name); printb("flags", ifa->ifa_flags, IFFBITS); if (ioctl(s, SIOCGIFMETRIC, &ifr) != -1) printf(" metric %d", ifr.ifr_metric); if (ioctl(s, SIOCGIFMTU, &ifr) != -1) printf(" mtu %d", ifr.ifr_mtu); putchar('\n'); for (;;) { if ((descr = reallocf(descr, descrlen)) != NULL) { ifr.ifr_buffer.buffer = descr; ifr.ifr_buffer.length = descrlen; if (ioctl(s, SIOCGIFDESCR, &ifr) == 0) { - if (strlen(descr) > 0) - printf("\tdescription: %s\n", descr); - break; - } else if (errno == ENAMETOOLONG) - descrlen = ifr.ifr_buffer.length; - else - break; - } else { + if (ifr.ifr_buffer.buffer == descr) { + if (strlen(descr) > 0) + printf("\tdescription: %s\n", + descr); + } else if (ifr.ifr_buffer.length > descrlen) { + descrlen = ifr.ifr_buffer.length; + continue; + } + } + } else warn("unable to allocate memory for interface" "description"); - break; - } - }; + break; + } if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) == 0) { if (ifr.ifr_curcap != 0) { printb("\toptions", ifr.ifr_curcap, IFCAPBITS); putchar('\n'); } if (supmedia && ifr.ifr_reqcap != 0) { printb("\tcapabilities", ifr.ifr_reqcap, IFCAPBITS); putchar('\n'); } } tunnel_status(s); for (ift = ifa; ift != NULL; ift = ift->ifa_next) { if (ift->ifa_addr == NULL) continue; if (strcmp(ifa->ifa_name, ift->ifa_name) != 0) continue; if (allfamilies) { const struct afswtch *p; p = af_getbyfamily(ift->ifa_addr->sa_family); if (p != NULL && p->af_status != NULL) p->af_status(s, ift); } else if (afp->af_af == ift->ifa_addr->sa_family) afp->af_status(s, ift); } #if 0 if (allfamilies || afp->af_af == AF_LINK) { const struct afswtch *lafp; /* * Hack; the link level address is received separately * from the routing information so any address is not * handled above. Cobble together an entry and invoke * the status method specially. */ lafp = af_getbyname("lladdr"); if (lafp != NULL) { info.rti_info[RTAX_IFA] = (struct sockaddr *)sdl; lafp->af_status(s, &info); } } #endif if (allfamilies) af_other_status(s); else if (afp->af_other_status != NULL) afp->af_other_status(s); strncpy(ifs.ifs_name, name, sizeof ifs.ifs_name); if (ioctl(s, SIOCGIFSTATUS, &ifs) == 0) printf("%s", ifs.ascii); close(s); return; } static void tunnel_status(int s) { af_all_tunnel_status(s); } void Perror(const char *cmd) { switch (errno) { case ENXIO: errx(1, "%s: no such interface", cmd); break; case EPERM: errx(1, "%s: permission denied", cmd); break; default: err(1, "%s", cmd); } } /* * Print a value a la the %b format of the kernel's printf */ void printb(const char *s, unsigned v, const char *bits) { int i, any = 0; char c; if (bits && *bits == 8) printf("%s=%o", s, v); else printf("%s=%x", s, v); bits++; if (bits) { putchar('<'); while ((i = *bits++) != '\0') { if (v & (1 << (i-1))) { if (any) putchar(','); any = 1; for (; (c = *bits) > 32; bits++) putchar(c); } else for (; *bits > 32; bits++) ; } putchar('>'); } } void ifmaybeload(const char *name) { #define MOD_PREFIX_LEN 3 /* "if_" */ struct module_stat mstat; int fileid, modid; char ifkind[IFNAMSIZ + MOD_PREFIX_LEN], ifname[IFNAMSIZ], *dp; const char *cp; /* loading suppressed by the user */ if (noload) return; /* trim the interface number off the end */ strlcpy(ifname, name, sizeof(ifname)); for (dp = ifname; *dp != 0; dp++) if (isdigit(*dp)) { *dp = 0; break; } /* turn interface and unit into module name */ strcpy(ifkind, "if_"); strlcpy(ifkind + MOD_PREFIX_LEN, ifname, sizeof(ifkind) - MOD_PREFIX_LEN); /* scan files in kernel */ mstat.version = sizeof(struct module_stat); for (fileid = kldnext(0); fileid > 0; fileid = kldnext(fileid)) { /* scan modules in file */ for (modid = kldfirstmod(fileid); modid > 0; modid = modfnext(modid)) { if (modstat(modid, &mstat) < 0) continue; /* strip bus name if present */ if ((cp = strchr(mstat.name, '/')) != NULL) { cp++; } else { cp = mstat.name; } /* already loaded? */ if (strncmp(ifname, cp, strlen(ifname) + 1) == 0 || strncmp(ifkind, cp, strlen(ifkind) + 1) == 0) return; } } /* not present, we should try to load it */ kldload(ifkind); } static struct cmd basic_cmds[] = { DEF_CMD("up", IFF_UP, setifflags), DEF_CMD("down", -IFF_UP, setifflags), DEF_CMD("arp", -IFF_NOARP, setifflags), DEF_CMD("-arp", IFF_NOARP, setifflags), DEF_CMD("debug", IFF_DEBUG, setifflags), DEF_CMD("-debug", -IFF_DEBUG, setifflags), DEF_CMD_ARG("description", setifdescr), DEF_CMD_ARG("descr", setifdescr), DEF_CMD("-description", 0, unsetifdescr), DEF_CMD("-descr", 0, unsetifdescr), DEF_CMD("promisc", IFF_PPROMISC, setifflags), DEF_CMD("-promisc", -IFF_PPROMISC, setifflags), DEF_CMD("add", IFF_UP, notealias), DEF_CMD("alias", IFF_UP, notealias), DEF_CMD("-alias", -IFF_UP, notealias), DEF_CMD("delete", -IFF_UP, notealias), DEF_CMD("remove", -IFF_UP, notealias), #ifdef notdef #define EN_SWABIPS 0x1000 DEF_CMD("swabips", EN_SWABIPS, setifflags), DEF_CMD("-swabips", -EN_SWABIPS, setifflags), #endif DEF_CMD_ARG("netmask", setifnetmask), DEF_CMD_ARG("metric", setifmetric), DEF_CMD_ARG("broadcast", setifbroadaddr), DEF_CMD_ARG("ipdst", setifipdst), DEF_CMD_ARG2("tunnel", settunnel), DEF_CMD("-tunnel", 0, deletetunnel), DEF_CMD("deletetunnel", 0, deletetunnel), DEF_CMD_ARG("vnet", setifvnet), DEF_CMD_ARG("-vnet", setifrvnet), DEF_CMD("link0", IFF_LINK0, setifflags), DEF_CMD("-link0", -IFF_LINK0, setifflags), DEF_CMD("link1", IFF_LINK1, setifflags), DEF_CMD("-link1", -IFF_LINK1, setifflags), DEF_CMD("link2", IFF_LINK2, setifflags), DEF_CMD("-link2", -IFF_LINK2, setifflags), DEF_CMD("monitor", IFF_MONITOR, setifflags), DEF_CMD("-monitor", -IFF_MONITOR, setifflags), DEF_CMD("staticarp", IFF_STATICARP, setifflags), DEF_CMD("-staticarp", -IFF_STATICARP, setifflags), DEF_CMD("rxcsum", IFCAP_RXCSUM, setifcap), DEF_CMD("-rxcsum", -IFCAP_RXCSUM, setifcap), DEF_CMD("txcsum", IFCAP_TXCSUM, setifcap), DEF_CMD("-txcsum", -IFCAP_TXCSUM, setifcap), DEF_CMD("netcons", IFCAP_NETCONS, setifcap), DEF_CMD("-netcons", -IFCAP_NETCONS, setifcap), DEF_CMD("polling", IFCAP_POLLING, setifcap), DEF_CMD("-polling", -IFCAP_POLLING, setifcap), DEF_CMD("tso", IFCAP_TSO, setifcap), DEF_CMD("-tso", -IFCAP_TSO, setifcap), DEF_CMD("lro", IFCAP_LRO, setifcap), DEF_CMD("-lro", -IFCAP_LRO, setifcap), DEF_CMD("wol", IFCAP_WOL, setifcap), DEF_CMD("-wol", -IFCAP_WOL, setifcap), DEF_CMD("wol_ucast", IFCAP_WOL_UCAST, setifcap), DEF_CMD("-wol_ucast", -IFCAP_WOL_UCAST, setifcap), DEF_CMD("wol_mcast", IFCAP_WOL_MCAST, setifcap), DEF_CMD("-wol_mcast", -IFCAP_WOL_MCAST, setifcap), DEF_CMD("wol_magic", IFCAP_WOL_MAGIC, setifcap), DEF_CMD("-wol_magic", -IFCAP_WOL_MAGIC, setifcap), DEF_CMD("normal", -IFF_LINK0, setifflags), DEF_CMD("compress", IFF_LINK0, setifflags), DEF_CMD("noicmp", IFF_LINK1, setifflags), DEF_CMD_ARG("mtu", setifmtu), DEF_CMD_ARG("name", setifname), }; static __constructor void ifconfig_ctor(void) { #define N(a) (sizeof(a) / sizeof(a[0])) size_t i; for (i = 0; i < N(basic_cmds); i++) cmd_register(&basic_cmds[i]); #undef N } Index: head/share/man/man4/netintro.4 =================================================================== --- head/share/man/man4/netintro.4 (revision 206636) +++ head/share/man/man4/netintro.4 (revision 206637) @@ -1,454 +1,457 @@ .\" Copyright (c) 1983, 1990, 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)netintro.4 8.2 (Berkeley) 11/30/93 .\" $FreeBSD$ .\" -.Dd January 26, 2010 +.Dd April 14, 2010 .Dt NETINTRO 4 .Os .Sh NAME .Nm networking .Nd introduction to networking facilities .Sh SYNOPSIS .In sys/types.h .In sys/time.h .In sys/socket.h .In net/if.h .In net/route.h .Sh DESCRIPTION This section is a general introduction to the networking facilities available in the system. Documentation in this part of section 4 is broken up into three areas: .Em protocol families (domains), .Em protocols , and .Em network interfaces . .Pp All network protocols are associated with a specific .Em protocol family . A protocol family provides basic services to the protocol implementation to allow it to function within a specific network environment. These services may include packet fragmentation and reassembly, routing, addressing, and basic transport. A protocol family may support multiple methods of addressing, though the current protocol implementations do not. A protocol family is normally comprised of a number of protocols, one per .Xr socket 2 type. It is not required that a protocol family support all socket types. A protocol family may contain multiple protocols supporting the same socket abstraction. .Pp A protocol supports one of the socket abstractions detailed in .Xr socket 2 . A specific protocol may be accessed either by creating a socket of the appropriate type and protocol family, or by requesting the protocol explicitly when creating a socket. Protocols normally accept only one type of address format, usually determined by the addressing structure inherent in the design of the protocol family/network architecture. Certain semantics of the basic socket abstractions are protocol specific. All protocols are expected to support the basic model for their particular socket type, but may, in addition, provide non-standard facilities or extensions to a mechanism. For example, a protocol supporting the .Dv SOCK_STREAM abstraction may allow more than one byte of out-of-band data to be transmitted per out-of-band message. .Pp A network interface is similar to a device interface. Network interfaces comprise the lowest layer of the networking subsystem, interacting with the actual transport hardware. An interface may support one or more protocol families and/or address formats. The SYNOPSIS section of each network interface entry gives a sample specification of the related drivers for use in providing a system description to the .Xr config 8 program. The DIAGNOSTICS section lists messages which may appear on the console and/or in the system error log, .Pa /var/log/messages (see .Xr syslogd 8 ) , due to errors in device operation. .Sh PROTOCOLS The system currently supports the Internet protocols, the Xerox Network Systems(tm) protocols, and some of the .Tn ISO OSI protocols. Raw socket interfaces are provided to the .Tn IP protocol layer of the Internet, and to the .Tn IDP protocol of Xerox .Tn NS . Consult the appropriate manual pages in this section for more information regarding the support for each protocol family. .Sh ADDRESSING Associated with each protocol family is an address format. All network addresses adhere to a general structure, called a sockaddr, described below. However, each protocol imposes finer and more specific structure, generally renaming the variant, which is discussed in the protocol family manual page alluded to above. .Bd -literal -offset indent struct sockaddr { u_char sa_len; u_char sa_family; char sa_data[14]; }; .Ed .Pp The field .Va sa_len contains the total length of the structure, which may exceed 16 bytes. The following address values for .Va sa_family are known to the system (and additional formats are defined for possible future implementation): .Bd -literal #define AF_UNIX 1 /* local to host (pipes, portals) */ #define AF_INET 2 /* internetwork: UDP, TCP, etc. */ #define AF_NS 6 /* Xerox NS protocols */ #define AF_CCITT 10 /* CCITT protocols, X.25 etc */ #define AF_HYLINK 15 /* NSC Hyperchannel */ #define AF_ISO 18 /* ISO protocols */ .Ed .Sh ROUTING .Fx provides some packet routing facilities. The kernel maintains a routing information database, which is used in selecting the appropriate network interface when transmitting packets. .Pp A user process (or possibly multiple co-operating processes) maintains this database by sending messages over a special kind of socket. This supplants fixed size .Xr ioctl 2 used in earlier releases. .Pp This facility is described in .Xr route 4 . .Sh INTERFACES Each network interface in a system corresponds to a path through which messages may be sent and received. A network interface usually has a hardware device associated with it, though certain interfaces such as the loopback interface, .Xr lo 4 , do not. .Pp The following .Xr ioctl 2 calls may be used to manipulate network interfaces. The .Fn ioctl is made on a socket (typically of type .Dv SOCK_DGRAM ) in the desired domain. Most of the requests supported in earlier releases take an .Vt ifreq structure as its parameter. This structure has the form .Bd -literal struct ifreq { #define IFNAMSIZ 16 char ifr_name[IFNAMSIZ]; /* if name, e.g. "en0" */ union { struct sockaddr ifru_addr; struct sockaddr ifru_dstaddr; struct sockaddr ifru_broadaddr; struct ifreq_buffer ifru_buffer; short ifru_flags[2]; short ifru_index; int ifru_metric; int ifru_mtu; int ifru_phys; int ifru_media; caddr_t ifru_data; int ifru_cap[2]; } ifr_ifru; #define ifr_addr ifr_ifru.ifru_addr /* address */ #define ifr_dstaddr ifr_ifru.ifru_dstaddr /* other end of p-to-p link */ #define ifr_broadaddr ifr_ifru.ifru_broadaddr /* broadcast address */ #define ifr_buffer ifr_ifru.ifru_buffer /* user supplied buffer with its length */ #define ifr_flags ifr_ifru.ifru_flags[0] /* flags (low 16 bits) */ #define ifr_flagshigh ifr_ifru.ifru_flags[1] /* flags (high 16 bits) */ #define ifr_metric ifr_ifru.ifru_metric /* metric */ #define ifr_mtu ifr_ifru.ifru_mtu /* mtu */ #define ifr_phys ifr_ifru.ifru_phys /* physical wire */ #define ifr_media ifr_ifru.ifru_media /* physical media */ #define ifr_data ifr_ifru.ifru_data /* for use by interface */ #define ifr_reqcap ifr_ifru.ifru_cap[0] /* requested capabilities */ #define ifr_curcap ifr_ifru.ifru_cap[1] /* current capabilities */ #define ifr_index ifr_ifru.ifru_index /* interface index */ }; .Ed .Pp Calls which are now deprecated are: .Bl -tag -width SIOCGIFBRDADDR .It Dv SIOCSIFADDR Set interface address for protocol family. Following the address assignment, the .Dq initialization routine for the interface is called. .It Dv SIOCSIFDSTADDR Set point to point address for protocol family and interface. .It Dv SIOCSIFBRDADDR Set broadcast address for protocol family and interface. .El .Pp .Fn Ioctl requests to obtain addresses and requests both to set and retrieve other data are still fully supported and use the .Vt ifreq structure: .Bl -tag -width SIOCGIFBRDADDR .It Dv SIOCGIFADDR Get interface address for protocol family. .It Dv SIOCGIFDSTADDR Get point to point address for protocol family and interface. .It Dv SIOCGIFBRDADDR Get broadcast address for protocol family and interface. .It Dv SIOCSIFCAP Attempt to set the enabled capabilities field for the interface to the value of the .Va ifr_reqcap field of the .Vt ifreq structure. Note that, depending on the particular interface features, some capabilities may appear hard-coded to enabled, or toggling a capability may affect the status of other ones. The supported capabilities field is read-only, and the .Va ifr_curcap field is unused by this call. .It Dv SIOCGIFCAP Get the interface capabilities fields. The values for supported and enabled capabilities will be returned in the .Va ifr_reqcap and .Va ifr_curcap fields of the .Vt ifreq structure, respectively. .It Dv SIOCGIFDESCR Get the interface description, returned in the .Va buffer field of .Va ifru_buffer struct. The user supplied buffer length should be defined in the .Va length field of .Va ifru_buffer struct passed in as parameter, and the length would include the terminating nul character. If there is not enough space to hold the interface length, -no copy would be done and an -error would be returned. +no copy would be done and the +.Va buffer +field of +.Va ifru_buffer +would be set to NULL. The kernel will store the buffer length in the .Va length field upon return, regardless whether the buffer itself is sufficient to hold the data. .It Dv SIOCSIFDESCR Set the interface description to the value of the .Va buffer field of .Va ifru_buffer struct, with .Va length field specifying its length (counting the terminating nul). .It Dv SIOCSIFFLAGS Set interface flags field. If the interface is marked down, any processes currently routing packets through the interface are notified; some interfaces may be reset so that incoming packets are no longer received. When marked up again, the interface is reinitialized. .It Dv SIOCGIFFLAGS Get interface flags. .It Dv SIOCSIFMETRIC Set interface routing metric. The metric is used only by user-level routers. .It Dv SIOCGIFMETRIC Get interface metric. .It Dv SIOCIFCREATE Attempt to create the specified interface. If the interface name is given without a unit number the system will attempt to create a new interface with an arbitrary unit number. On successful return the .Va ifr_name field will contain the new interface name. .It Dv SIOCIFDESTROY Attempt to destroy the specified interface. .El .Pp There are two requests that make use of a new structure: .Bl -tag -width SIOCGIFBRDADDR .It Dv SIOCAIFADDR An interface may have more than one address associated with it in some protocols. This request provides a means to add additional addresses (or modify characteristics of the primary address if the default address for the address family is specified). Rather than making separate calls to set destination or broadcast addresses, or network masks (now an integral feature of multiple protocols) a separate structure is used to specify all three facets simultaneously (see below). One would use a slightly tailored version of this struct specific to each family (replacing each sockaddr by one of the family-specific type). Where the sockaddr itself is larger than the default size, one needs to modify the .Fn ioctl identifier itself to include the total size, as described in .Fn ioctl . .It Dv SIOCDIFADDR This requests deletes the specified address from the list associated with an interface. It also uses the .Vt ifaliasreq structure to allow for the possibility of protocols allowing multiple masks or destination addresses, and also adopts the convention that specification of the default address means to delete the first address for the interface belonging to the address family in which the original socket was opened. .It Dv SIOCGIFCONF Get interface configuration list. This request takes an .Vt ifconf structure (see below) as a value-result parameter. The .Va ifc_len field should be initially set to the size of the buffer pointed to by .Va ifc_buf . On return it will contain the length, in bytes, of the configuration list. .It Dv SIOCIFGCLONERS Get list of clonable interfaces. This request takes an .Vt if_clonereq structure (see below) as a value-result parameter. The .Va ifcr_count field should be set to the number of .Dv IFNAMSIZ sized strings that can be fit in the buffer pointed to by .Va ifcr_buffer . On return, .Va ifcr_total will be set to the number of clonable interfaces and the buffer pointed to by .Va ifcr_buffer will be filled with the names of clonable interfaces aligned on .Dv IFNAMSIZ boundaries. .El .Bd -literal /* * Structure used in SIOCAIFCONF request. */ struct ifaliasreq { char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ struct sockaddr ifra_addr; struct sockaddr ifra_broadaddr; struct sockaddr ifra_mask; }; .Ed .Pp .Bd -literal /* * Structure used in SIOCGIFCONF request. * Used to retrieve interface configuration * for machine (useful for programs which * must know all networks accessible). */ struct ifconf { int ifc_len; /* size of associated buffer */ union { caddr_t ifcu_buf; struct ifreq *ifcu_req; } ifc_ifcu; #define ifc_buf ifc_ifcu.ifcu_buf /* buffer address */ #define ifc_req ifc_ifcu.ifcu_req /* array of structures returned */ }; .Ed .Pp .Bd -literal /* Structure used in SIOCIFGCLONERS request. */ struct if_clonereq { int ifcr_total; /* total cloners (out) */ int ifcr_count; /* room for this many in user buffer */ char *ifcr_buffer; /* buffer for cloner names */ }; .Ed .Bd -literal /* Structure used in SIOCGIFDESCR and SIOCSIFDESCR requests */ struct ifreq_buffer { size_t length; /* length of the buffer */ void *buffer; /* pointer to userland space buffer */ }; .Ed .Sh SEE ALSO .Xr ioctl 2 , .Xr socket 2 , .Xr intro 4 , .Xr config 8 , .Xr routed 8 , .Xr ifnet 9 .Sh HISTORY The .Nm netintro manual appeared in .Bx 4.3 tahoe . Index: head/sys/net/if.c =================================================================== --- head/sys/net/if.c (revision 206636) +++ head/sys/net/if.c (revision 206637) @@ -1,3420 +1,3419 @@ /*- * Copyright (c) 1980, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)if.c 8.5 (Berkeley) 1/9/95 * $FreeBSD$ */ #include "opt_compat.h" #include "opt_inet6.h" #include "opt_inet.h" #include "opt_carp.h" #include "opt_ddb.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DDB #include #endif #include #include #include #include #include #include #include #include #include #if defined(INET) || defined(INET6) /*XXX*/ #include #include #ifdef INET6 #include #include #endif #endif #ifdef INET #include #endif #if defined(INET) || defined(INET6) #ifdef DEV_CARP #include #endif #endif #include struct ifindex_entry { struct ifnet *ife_ifnet; }; SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); /* Log link state change events */ static int log_link_state_change = 1; SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, &log_link_state_change, 0, "log interface link state change events"); /* Interface description */ static unsigned int ifdescr_maxlen = 1024; SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, &ifdescr_maxlen, 0, "administrative maximum length for interface description"); MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); /* global sx for non-critical path ifdescr */ static struct sx ifdescr_sx; SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); void (*bstp_linkstate_p)(struct ifnet *ifp, int state); void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); void (*lagg_linkstate_p)(struct ifnet *ifp, int state); struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; /* * XXX: Style; these should be sorted alphabetically, and unprototyped * static functions should be prototyped. Currently they are sorted by * declaration order. */ static void if_attachdomain(void *); static void if_attachdomain1(struct ifnet *); static int ifconf(u_long, caddr_t); static void if_freemulti(struct ifmultiaddr *); static void if_init(void *); static void if_grow(void); static void if_route(struct ifnet *, int flag, int fam); static int if_setflag(struct ifnet *, int, int, int *, int); static int if_transmit(struct ifnet *ifp, struct mbuf *m); static void if_unroute(struct ifnet *, int flag, int fam); static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); static int if_rtdel(struct radix_node *, void *); static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); static void do_link_state_change(void *, int); static int if_getgroup(struct ifgroupreq *, struct ifnet *); static int if_getgroupmembers(struct ifgroupreq *); static void if_delgroups(struct ifnet *); static void if_attach_internal(struct ifnet *, int); static void if_detach_internal(struct ifnet *, int); #ifdef INET6 /* * XXX: declare here to avoid to include many inet6 related files.. * should be more generalized? */ extern void nd6_setmtu(struct ifnet *); #endif VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ VNET_DEFINE(struct ifgrouphead, ifg_head); VNET_DEFINE(int, if_index); static VNET_DEFINE(int, if_indexlim) = 8; /* Table of ifnet by index. */ static VNET_DEFINE(struct ifindex_entry *, ifindex_table); #define V_if_indexlim VNET(if_indexlim) #define V_ifindex_table VNET(ifindex_table) int ifqmaxlen = IFQ_MAXLEN; /* * The global network interface list (V_ifnet) and related state (such as * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and * an rwlock. Either may be acquired shared to stablize the list, but both * must be acquired writable to modify the list. This model allows us to * both stablize the interface list during interrupt thread processing, but * also to stablize it over long-running ioctls, without introducing priority * inversions and deadlocks. */ struct rwlock ifnet_rwlock; struct sx ifnet_sxlock; /* * The allocation of network interfaces is a rather non-atomic affair; we * need to select an index before we are ready to expose the interface for * use, so will use this pointer value to indicate reservation. */ #define IFNET_HOLD (void *)(uintptr_t)(-1) static if_com_alloc_t *if_com_alloc[256]; static if_com_free_t *if_com_free[256]; MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); struct ifnet * ifnet_byindex_locked(u_short idx) { if (idx > V_if_index) return (NULL); if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) return (NULL); return (V_ifindex_table[idx].ife_ifnet); } struct ifnet * ifnet_byindex(u_short idx) { struct ifnet *ifp; IFNET_RLOCK_NOSLEEP(); ifp = ifnet_byindex_locked(idx); IFNET_RUNLOCK_NOSLEEP(); return (ifp); } struct ifnet * ifnet_byindex_ref(u_short idx) { struct ifnet *ifp; IFNET_RLOCK_NOSLEEP(); ifp = ifnet_byindex_locked(idx); if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { IFNET_RUNLOCK_NOSLEEP(); return (NULL); } if_ref(ifp); IFNET_RUNLOCK_NOSLEEP(); return (ifp); } /* * Allocate an ifindex array entry; return 0 on success or an error on * failure. */ static int ifindex_alloc_locked(u_short *idxp) { u_short idx; IFNET_WLOCK_ASSERT(); /* * Try to find an empty slot below V_if_index. If we fail, take the * next slot. */ for (idx = 1; idx <= V_if_index; idx++) { if (V_ifindex_table[idx].ife_ifnet == NULL) break; } /* Catch if_index overflow. */ if (idx < 1) return (ENOSPC); if (idx > V_if_index) V_if_index = idx; if (V_if_index >= V_if_indexlim) if_grow(); *idxp = idx; return (0); } static void ifindex_free_locked(u_short idx) { IFNET_WLOCK_ASSERT(); V_ifindex_table[idx].ife_ifnet = NULL; while (V_if_index > 0 && V_ifindex_table[V_if_index].ife_ifnet == NULL) V_if_index--; } static void ifindex_free(u_short idx) { IFNET_WLOCK(); ifindex_free_locked(idx); IFNET_WUNLOCK(); } static void ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) { IFNET_WLOCK_ASSERT(); V_ifindex_table[idx].ife_ifnet = ifp; } static void ifnet_setbyindex(u_short idx, struct ifnet *ifp) { IFNET_WLOCK(); ifnet_setbyindex_locked(idx, ifp); IFNET_WUNLOCK(); } struct ifaddr * ifaddr_byindex(u_short idx) { struct ifaddr *ifa; IFNET_RLOCK_NOSLEEP(); ifa = ifnet_byindex_locked(idx)->if_addr; if (ifa != NULL) ifa_ref(ifa); IFNET_RUNLOCK_NOSLEEP(); return (ifa); } /* * Network interface utility routines. * * Routines with ifa_ifwith* names take sockaddr *'s as * parameters. */ static void vnet_if_init(const void *unused __unused) { TAILQ_INIT(&V_ifnet); TAILQ_INIT(&V_ifg_head); if_grow(); /* create initial table */ vnet_if_clone_init(); } VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_FIRST, vnet_if_init, NULL); /* ARGSUSED*/ static void if_init(void *dummy __unused) { IFNET_LOCK_INIT(); if_clone_init(); } SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_SECOND, if_init, NULL); #ifdef VIMAGE static void vnet_if_uninit(const void *unused __unused) { VNET_ASSERT(TAILQ_EMPTY(&V_ifnet)); VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head)); free((caddr_t)V_ifindex_table, M_IFNET); } VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, vnet_if_uninit, NULL); #endif static void if_grow(void) { u_int n; struct ifindex_entry *e; V_if_indexlim <<= 1; n = V_if_indexlim * sizeof(*e); e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); if (V_ifindex_table != NULL) { memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); free((caddr_t)V_ifindex_table, M_IFNET); } V_ifindex_table = e; } /* * Allocate a struct ifnet and an index for an interface. A layer 2 * common structure will also be allocated if an allocation routine is * registered for the passed type. */ struct ifnet * if_alloc(u_char type) { struct ifnet *ifp; u_short idx; ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); IFNET_WLOCK(); if (ifindex_alloc_locked(&idx) != 0) { IFNET_WUNLOCK(); free(ifp, M_IFNET); return (NULL); } ifnet_setbyindex_locked(idx, IFNET_HOLD); IFNET_WUNLOCK(); ifp->if_index = idx; ifp->if_type = type; ifp->if_alloctype = type; if (if_com_alloc[type] != NULL) { ifp->if_l2com = if_com_alloc[type](type, ifp); if (ifp->if_l2com == NULL) { free(ifp, M_IFNET); ifindex_free(idx); return (NULL); } } IF_ADDR_LOCK_INIT(ifp); TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); ifp->if_afdata_initialized = 0; IF_AFDATA_LOCK_INIT(ifp); TAILQ_INIT(&ifp->if_addrhead); TAILQ_INIT(&ifp->if_prefixhead); TAILQ_INIT(&ifp->if_multiaddrs); TAILQ_INIT(&ifp->if_groups); #ifdef MAC mac_ifnet_init(ifp); #endif ifq_init(&ifp->if_snd, ifp); refcount_init(&ifp->if_refcount, 1); /* Index reference. */ ifnet_setbyindex(ifp->if_index, ifp); return (ifp); } /* * Do the actual work of freeing a struct ifnet, associated index, and layer * 2 common structure. This call is made when the last reference to an * interface is released. */ static void if_free_internal(struct ifnet *ifp) { KASSERT((ifp->if_flags & IFF_DYING), ("if_free_internal: interface not dying")); IFNET_WLOCK(); KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), ("%s: freeing unallocated ifnet", ifp->if_xname)); ifindex_free_locked(ifp->if_index); IFNET_WUNLOCK(); if (if_com_free[ifp->if_alloctype] != NULL) if_com_free[ifp->if_alloctype](ifp->if_l2com, ifp->if_alloctype); #ifdef MAC mac_ifnet_destroy(ifp); #endif /* MAC */ if (ifp->if_description != NULL) free(ifp->if_description, M_IFDESCR); IF_AFDATA_DESTROY(ifp); IF_ADDR_LOCK_DESTROY(ifp); ifq_delete(&ifp->if_snd); free(ifp, M_IFNET); } /* * This version should only be called by intefaces that switch their type * after calling if_alloc(). if_free_type() will go away again now that we * have if_alloctype to cache the original allocation type. For now, assert * that they match, since we require that in practice. */ void if_free_type(struct ifnet *ifp, u_char type) { KASSERT(ifp->if_alloctype == type, ("if_free_type: type (%d) != alloctype (%d)", type, ifp->if_alloctype)); ifp->if_flags |= IFF_DYING; /* XXX: Locking */ if (!refcount_release(&ifp->if_refcount)) return; if_free_internal(ifp); } /* * This is the normal version of if_free(), used by device drivers to free a * detached network interface. The contents of if_free_type() will move into * here when if_free_type() goes away. */ void if_free(struct ifnet *ifp) { if_free_type(ifp, ifp->if_alloctype); } /* * Interfaces to keep an ifnet type-stable despite the possibility of the * driver calling if_free(). If there are additional references, we defer * freeing the underlying data structure. */ void if_ref(struct ifnet *ifp) { /* We don't assert the ifnet list lock here, but arguably should. */ refcount_acquire(&ifp->if_refcount); } void if_rele(struct ifnet *ifp) { if (!refcount_release(&ifp->if_refcount)) return; if_free_internal(ifp); } void ifq_init(struct ifaltq *ifq, struct ifnet *ifp) { mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); if (ifq->ifq_maxlen == 0) ifq->ifq_maxlen = ifqmaxlen; ifq->altq_type = 0; ifq->altq_disc = NULL; ifq->altq_flags &= ALTQF_CANTCHANGE; ifq->altq_tbr = NULL; ifq->altq_ifp = ifp; } void ifq_delete(struct ifaltq *ifq) { mtx_destroy(&ifq->ifq_mtx); } /* * Perform generic interface initalization tasks and attach the interface * to the list of "active" interfaces. If vmove flag is set on entry * to if_attach_internal(), perform only a limited subset of initialization * tasks, given that we are moving from one vnet to another an ifnet which * has already been fully initialized. * * XXX: * - The decision to return void and thus require this function to * succeed is questionable. * - We should probably do more sanity checking. For instance we don't * do anything to insure if_xname is unique or non-empty. */ void if_attach(struct ifnet *ifp) { if_attach_internal(ifp, 0); } static void if_attach_internal(struct ifnet *ifp, int vmove) { unsigned socksize, ifasize; int namelen, masklen; struct sockaddr_dl *sdl; struct ifaddr *ifa; if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) panic ("%s: BUG: if_attach called without if_alloc'd input()\n", ifp->if_xname); #ifdef VIMAGE ifp->if_vnet = curvnet; if (ifp->if_home_vnet == NULL) ifp->if_home_vnet = curvnet; #endif if_addgroup(ifp, IFG_ALL); getmicrotime(&ifp->if_lastchange); ifp->if_data.ifi_epoch = time_uptime; ifp->if_data.ifi_datalen = sizeof(struct if_data); KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || (ifp->if_transmit != NULL && ifp->if_qflush != NULL), ("transmit and qflush must both either be set or both be NULL")); if (ifp->if_transmit == NULL) { ifp->if_transmit = if_transmit; ifp->if_qflush = if_qflush; } if (!vmove) { #ifdef MAC mac_ifnet_create(ifp); #endif /* * Create a Link Level name for this device. */ namelen = strlen(ifp->if_xname); /* * Always save enough space for any possiable name so we * can do a rename in place later. */ masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; socksize = masklen + ifp->if_addrlen; if (socksize < sizeof(*sdl)) socksize = sizeof(*sdl); socksize = roundup2(socksize, sizeof(long)); ifasize = sizeof(*ifa) + 2 * socksize; ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); ifa_init(ifa); sdl = (struct sockaddr_dl *)(ifa + 1); sdl->sdl_len = socksize; sdl->sdl_family = AF_LINK; bcopy(ifp->if_xname, sdl->sdl_data, namelen); sdl->sdl_nlen = namelen; sdl->sdl_index = ifp->if_index; sdl->sdl_type = ifp->if_type; ifp->if_addr = ifa; ifa->ifa_ifp = ifp; ifa->ifa_rtrequest = link_rtrequest; ifa->ifa_addr = (struct sockaddr *)sdl; sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); ifa->ifa_netmask = (struct sockaddr *)sdl; sdl->sdl_len = masklen; while (namelen != 0) sdl->sdl_data[--namelen] = 0xff; TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); /* Reliably crash if used uninitialized. */ ifp->if_broadcastaddr = NULL; } #ifdef VIMAGE else { /* * Update the interface index in the link layer address * of the interface. */ for (ifa = ifp->if_addr; ifa != NULL; ifa = TAILQ_NEXT(ifa, ifa_link)) { if (ifa->ifa_addr->sa_family == AF_LINK) { sdl = (struct sockaddr_dl *)ifa->ifa_addr; sdl->sdl_index = ifp->if_index; } } } #endif IFNET_WLOCK(); TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); #ifdef VIMAGE curvnet->vnet_ifcnt++; #endif IFNET_WUNLOCK(); if (domain_init_status >= 2) if_attachdomain1(ifp); EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); if (IS_DEFAULT_VNET(curvnet)) devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); /* Announce the interface. */ rt_ifannouncemsg(ifp, IFAN_ARRIVAL); } static void if_attachdomain(void *dummy) { struct ifnet *ifp; int s; s = splnet(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) if_attachdomain1(ifp); splx(s); } SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, if_attachdomain, NULL); static void if_attachdomain1(struct ifnet *ifp) { struct domain *dp; int s; s = splnet(); /* * Since dp->dom_ifattach calls malloc() with M_WAITOK, we * cannot lock ifp->if_afdata initialization, entirely. */ if (IF_AFDATA_TRYLOCK(ifp) == 0) { splx(s); return; } if (ifp->if_afdata_initialized >= domain_init_status) { IF_AFDATA_UNLOCK(ifp); splx(s); printf("if_attachdomain called more than once on %s\n", ifp->if_xname); return; } ifp->if_afdata_initialized = domain_init_status; IF_AFDATA_UNLOCK(ifp); /* address family dependent data region */ bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); for (dp = domains; dp; dp = dp->dom_next) { if (dp->dom_ifattach) ifp->if_afdata[dp->dom_family] = (*dp->dom_ifattach)(ifp); } splx(s); } /* * Remove any unicast or broadcast network addresses from an interface. */ void if_purgeaddrs(struct ifnet *ifp) { struct ifaddr *ifa, *next; TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { if (ifa->ifa_addr->sa_family == AF_LINK) continue; #ifdef INET /* XXX: Ugly!! ad hoc just for INET */ if (ifa->ifa_addr->sa_family == AF_INET) { struct ifaliasreq ifr; bzero(&ifr, sizeof(ifr)); ifr.ifra_addr = *ifa->ifa_addr; if (ifa->ifa_dstaddr) ifr.ifra_broadaddr = *ifa->ifa_dstaddr; if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, NULL) == 0) continue; } #endif /* INET */ #ifdef INET6 if (ifa->ifa_addr->sa_family == AF_INET6) { in6_purgeaddr(ifa); /* ifp_addrhead is already updated */ continue; } #endif /* INET6 */ TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); ifa_free(ifa); } } /* * Remove any multicast network addresses from an interface when an ifnet * is going away. */ static void if_purgemaddrs(struct ifnet *ifp) { struct ifmultiaddr *ifma; struct ifmultiaddr *next; IF_ADDR_LOCK(ifp); TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) if_delmulti_locked(ifp, ifma, 1); IF_ADDR_UNLOCK(ifp); } /* * Detach an interface, removing it from the list of "active" interfaces. * If vmove flag is set on entry to if_detach_internal(), perform only a * limited subset of cleanup tasks, given that we are moving an ifnet from * one vnet to another, where it must be fully operational. * * XXXRW: There are some significant questions about event ordering, and * how to prevent things from starting to use the interface during detach. */ void if_detach(struct ifnet *ifp) { if_detach_internal(ifp, 0); } static void if_detach_internal(struct ifnet *ifp, int vmove) { struct ifaddr *ifa; struct radix_node_head *rnh; int i, j; struct domain *dp; struct ifnet *iter; int found = 0; IFNET_WLOCK(); TAILQ_FOREACH(iter, &V_ifnet, if_link) if (iter == ifp) { TAILQ_REMOVE(&V_ifnet, ifp, if_link); found = 1; break; } #ifdef VIMAGE if (found) curvnet->vnet_ifcnt--; #endif IFNET_WUNLOCK(); if (!found) { if (vmove) panic("%s: ifp=%p not on the ifnet tailq %p", __func__, ifp, &V_ifnet); else return; /* XXX this should panic as well? */ } /* * Remove/wait for pending events. */ taskqueue_drain(taskqueue_swi, &ifp->if_linktask); /* * Remove routes and flush queues. */ if_down(ifp); #ifdef ALTQ if (ALTQ_IS_ENABLED(&ifp->if_snd)) altq_disable(&ifp->if_snd); if (ALTQ_IS_ATTACHED(&ifp->if_snd)) altq_detach(&ifp->if_snd); #endif if_purgeaddrs(ifp); #ifdef INET in_ifdetach(ifp); #endif #ifdef INET6 /* * Remove all IPv6 kernel structs related to ifp. This should be done * before removing routing entries below, since IPv6 interface direct * routes are expected to be removed by the IPv6-specific kernel API. * Otherwise, the kernel will detect some inconsistency and bark it. */ in6_ifdetach(ifp); #endif if_purgemaddrs(ifp); if (!vmove) { /* * Prevent further calls into the device driver via ifnet. */ if_dead(ifp); /* * Remove link ifaddr pointer and maybe decrement if_index. * Clean up all addresses. */ ifp->if_addr = NULL; /* We can now free link ifaddr. */ if (!TAILQ_EMPTY(&ifp->if_addrhead)) { ifa = TAILQ_FIRST(&ifp->if_addrhead); TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); ifa_free(ifa); } } /* * Delete all remaining routes using this interface * Unfortuneatly the only way to do this is to slog through * the entire routing table looking for routes which point * to this interface...oh well... */ for (i = 1; i <= AF_MAX; i++) { for (j = 0; j < rt_numfibs; j++) { rnh = rt_tables_get_rnh(j, i); if (rnh == NULL) continue; RADIX_NODE_HEAD_LOCK(rnh); (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); RADIX_NODE_HEAD_UNLOCK(rnh); } } /* Announce that the interface is gone. */ rt_ifannouncemsg(ifp, IFAN_DEPARTURE); EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); if (IS_DEFAULT_VNET(curvnet)) devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); if_delgroups(ifp); /* * We cannot hold the lock over dom_ifdetach calls as they might * sleep, for example trying to drain a callout, thus open up the * theoretical race with re-attaching. */ IF_AFDATA_LOCK(ifp); i = ifp->if_afdata_initialized; ifp->if_afdata_initialized = 0; IF_AFDATA_UNLOCK(ifp); for (dp = domains; i > 0 && dp; dp = dp->dom_next) { if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) (*dp->dom_ifdetach)(ifp, ifp->if_afdata[dp->dom_family]); } } #ifdef VIMAGE /* * if_vmove() performs a limited version of if_detach() in current * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. * An attempt is made to shrink if_index in current vnet, find an * unused if_index in target vnet and calls if_grow() if necessary, * and finally find an unused if_xname for the target vnet. */ void if_vmove(struct ifnet *ifp, struct vnet *new_vnet) { u_short idx; /* * Detach from current vnet, but preserve LLADDR info, do not * mark as dead etc. so that the ifnet can be reattached later. */ if_detach_internal(ifp, 1); /* * Unlink the ifnet from ifindex_table[] in current vnet, and shrink * the if_index for that vnet if possible. * * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, * or we'd lock on one vnet and unlock on another. */ IFNET_WLOCK(); ifindex_free_locked(ifp->if_index); /* * Switch to the context of the target vnet. */ CURVNET_SET_QUIET(new_vnet); if (ifindex_alloc_locked(&idx) != 0) { IFNET_WUNLOCK(); panic("if_index overflow"); } ifp->if_index = idx; ifnet_setbyindex_locked(ifp->if_index, ifp); IFNET_WUNLOCK(); if_attach_internal(ifp, 1); CURVNET_RESTORE(); } /* * Move an ifnet to or from another child prison/vnet, specified by the jail id. */ static int if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) { struct prison *pr; struct ifnet *difp; /* Try to find the prison within our visibility. */ sx_slock(&allprison_lock); pr = prison_find_child(td->td_ucred->cr_prison, jid); sx_sunlock(&allprison_lock); if (pr == NULL) return (ENXIO); prison_hold_locked(pr); mtx_unlock(&pr->pr_mtx); /* Do not try to move the iface from and to the same prison. */ if (pr->pr_vnet == ifp->if_vnet) { prison_free(pr); return (EEXIST); } /* Make sure the named iface does not exists in the dst. prison/vnet. */ /* XXX Lock interfaces to avoid races. */ CURVNET_SET_QUIET(pr->pr_vnet); difp = ifunit(ifname); CURVNET_RESTORE(); if (difp != NULL) { prison_free(pr); return (EEXIST); } /* Move the interface into the child jail/vnet. */ if_vmove(ifp, pr->pr_vnet); /* Report the new if_xname back to the userland. */ sprintf(ifname, "%s", ifp->if_xname); prison_free(pr); return (0); } static int if_vmove_reclaim(struct thread *td, char *ifname, int jid) { struct prison *pr; struct vnet *vnet_dst; struct ifnet *ifp; /* Try to find the prison within our visibility. */ sx_slock(&allprison_lock); pr = prison_find_child(td->td_ucred->cr_prison, jid); sx_sunlock(&allprison_lock); if (pr == NULL) return (ENXIO); prison_hold_locked(pr); mtx_unlock(&pr->pr_mtx); /* Make sure the named iface exists in the source prison/vnet. */ CURVNET_SET(pr->pr_vnet); ifp = ifunit(ifname); /* XXX Lock to avoid races. */ if (ifp == NULL) { CURVNET_RESTORE(); prison_free(pr); return (ENXIO); } /* Do not try to move the iface from and to the same prison. */ vnet_dst = TD_TO_VNET(td); if (vnet_dst == ifp->if_vnet) { CURVNET_RESTORE(); prison_free(pr); return (EEXIST); } /* Get interface back from child jail/vnet. */ if_vmove(ifp, vnet_dst); CURVNET_RESTORE(); /* Report the new if_xname back to the userland. */ sprintf(ifname, "%s", ifp->if_xname); prison_free(pr); return (0); } #endif /* VIMAGE */ /* * Add a group to an interface */ int if_addgroup(struct ifnet *ifp, const char *groupname) { struct ifg_list *ifgl; struct ifg_group *ifg = NULL; struct ifg_member *ifgm; if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && groupname[strlen(groupname) - 1] <= '9') return (EINVAL); IFNET_WLOCK(); TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { IFNET_WUNLOCK(); return (EEXIST); } if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, M_NOWAIT)) == NULL) { IFNET_WUNLOCK(); return (ENOMEM); } if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), M_TEMP, M_NOWAIT)) == NULL) { free(ifgl, M_TEMP); IFNET_WUNLOCK(); return (ENOMEM); } TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) if (!strcmp(ifg->ifg_group, groupname)) break; if (ifg == NULL) { if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), M_TEMP, M_NOWAIT)) == NULL) { free(ifgl, M_TEMP); free(ifgm, M_TEMP); IFNET_WUNLOCK(); return (ENOMEM); } strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); ifg->ifg_refcnt = 0; TAILQ_INIT(&ifg->ifg_members); EVENTHANDLER_INVOKE(group_attach_event, ifg); TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); } ifg->ifg_refcnt++; ifgl->ifgl_group = ifg; ifgm->ifgm_ifp = ifp; IF_ADDR_LOCK(ifp); TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); IF_ADDR_UNLOCK(ifp); IFNET_WUNLOCK(); EVENTHANDLER_INVOKE(group_change_event, groupname); return (0); } /* * Remove a group from an interface */ int if_delgroup(struct ifnet *ifp, const char *groupname) { struct ifg_list *ifgl; struct ifg_member *ifgm; IFNET_WLOCK(); TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) break; if (ifgl == NULL) { IFNET_WUNLOCK(); return (ENOENT); } IF_ADDR_LOCK(ifp); TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); IF_ADDR_UNLOCK(ifp); TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) if (ifgm->ifgm_ifp == ifp) break; if (ifgm != NULL) { TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); free(ifgm, M_TEMP); } if (--ifgl->ifgl_group->ifg_refcnt == 0) { TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); free(ifgl->ifgl_group, M_TEMP); } IFNET_WUNLOCK(); free(ifgl, M_TEMP); EVENTHANDLER_INVOKE(group_change_event, groupname); return (0); } /* * Remove an interface from all groups */ static void if_delgroups(struct ifnet *ifp) { struct ifg_list *ifgl; struct ifg_member *ifgm; char groupname[IFNAMSIZ]; IFNET_WLOCK(); while (!TAILQ_EMPTY(&ifp->if_groups)) { ifgl = TAILQ_FIRST(&ifp->if_groups); strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); IF_ADDR_LOCK(ifp); TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); IF_ADDR_UNLOCK(ifp); TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) if (ifgm->ifgm_ifp == ifp) break; if (ifgm != NULL) { TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); free(ifgm, M_TEMP); } if (--ifgl->ifgl_group->ifg_refcnt == 0) { TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); free(ifgl->ifgl_group, M_TEMP); } IFNET_WUNLOCK(); free(ifgl, M_TEMP); EVENTHANDLER_INVOKE(group_change_event, groupname); IFNET_WLOCK(); } IFNET_WUNLOCK(); } /* * Stores all groups from an interface in memory pointed * to by data */ static int if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) { int len, error; struct ifg_list *ifgl; struct ifg_req ifgrq, *ifgp; struct ifgroupreq *ifgr = data; if (ifgr->ifgr_len == 0) { IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) ifgr->ifgr_len += sizeof(struct ifg_req); IF_ADDR_UNLOCK(ifp); return (0); } len = ifgr->ifgr_len; ifgp = ifgr->ifgr_groups; /* XXX: wire */ IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { if (len < sizeof(ifgrq)) { IF_ADDR_UNLOCK(ifp); return (EINVAL); } bzero(&ifgrq, sizeof ifgrq); strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, sizeof(ifgrq.ifgrq_group)); if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { IF_ADDR_UNLOCK(ifp); return (error); } len -= sizeof(ifgrq); ifgp++; } IF_ADDR_UNLOCK(ifp); return (0); } /* * Stores all members of a group in memory pointed to by data */ static int if_getgroupmembers(struct ifgroupreq *data) { struct ifgroupreq *ifgr = data; struct ifg_group *ifg; struct ifg_member *ifgm; struct ifg_req ifgrq, *ifgp; int len, error; IFNET_RLOCK(); TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) break; if (ifg == NULL) { IFNET_RUNLOCK(); return (ENOENT); } if (ifgr->ifgr_len == 0) { TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) ifgr->ifgr_len += sizeof(ifgrq); IFNET_RUNLOCK(); return (0); } len = ifgr->ifgr_len; ifgp = ifgr->ifgr_groups; TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { if (len < sizeof(ifgrq)) { IFNET_RUNLOCK(); return (EINVAL); } bzero(&ifgrq, sizeof ifgrq); strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, sizeof(ifgrq.ifgrq_member)); if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { IFNET_RUNLOCK(); return (error); } len -= sizeof(ifgrq); ifgp++; } IFNET_RUNLOCK(); return (0); } /* * Delete Routes for a Network Interface * * Called for each routing entry via the rnh->rnh_walktree() call above * to delete all route entries referencing a detaching network interface. * * Arguments: * rn pointer to node in the routing table * arg argument passed to rnh->rnh_walktree() - detaching interface * * Returns: * 0 successful * errno failed - reason indicated * */ static int if_rtdel(struct radix_node *rn, void *arg) { struct rtentry *rt = (struct rtentry *)rn; struct ifnet *ifp = arg; int err; if (rt->rt_ifp == ifp) { /* * Protect (sorta) against walktree recursion problems * with cloned routes */ if ((rt->rt_flags & RTF_UP) == 0) return (0); err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, (struct rtentry **) NULL, rt->rt_fibnum); if (err) { log(LOG_WARNING, "if_rtdel: error %d\n", err); } } return (0); } /* * Wrapper functions for struct ifnet address list locking macros. These are * used by kernel modules to avoid encoding programming interface or binary * interface assumptions that may be violated when kernel-internal locking * approaches change. */ void if_addr_rlock(struct ifnet *ifp) { IF_ADDR_LOCK(ifp); } void if_addr_runlock(struct ifnet *ifp) { IF_ADDR_UNLOCK(ifp); } void if_maddr_rlock(struct ifnet *ifp) { IF_ADDR_LOCK(ifp); } void if_maddr_runlock(struct ifnet *ifp) { IF_ADDR_UNLOCK(ifp); } /* * Reference count functions for ifaddrs. */ void ifa_init(struct ifaddr *ifa) { mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); refcount_init(&ifa->ifa_refcnt, 1); } void ifa_ref(struct ifaddr *ifa) { refcount_acquire(&ifa->ifa_refcnt); } void ifa_free(struct ifaddr *ifa) { if (refcount_release(&ifa->ifa_refcnt)) { mtx_destroy(&ifa->ifa_mtx); free(ifa, M_IFADDR); } } int ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) { int error = 0; struct rtentry *rt = NULL; struct rt_addrinfo info; static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; bzero(&info, sizeof(info)); info.rti_ifp = V_loif; info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; info.rti_info[RTAX_DST] = ia; info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); if (error == 0 && rt != NULL) { RT_LOCK(rt); ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = ifa->ifa_ifp->if_type; ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = ifa->ifa_ifp->if_index; RT_REMREF(rt); RT_UNLOCK(rt); } else if (error != 0) log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n"); return (error); } int ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) { int error = 0; struct rt_addrinfo info; struct sockaddr_dl null_sdl; bzero(&null_sdl, sizeof(null_sdl)); null_sdl.sdl_len = sizeof(null_sdl); null_sdl.sdl_family = AF_LINK; null_sdl.sdl_type = ifa->ifa_ifp->if_type; null_sdl.sdl_index = ifa->ifa_ifp->if_index; bzero(&info, sizeof(info)); info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; info.rti_info[RTAX_DST] = ia; info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); if (error != 0) log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n"); return (error); } /* * XXX: Because sockaddr_dl has deeper structure than the sockaddr * structs used to represent other address families, it is necessary * to perform a different comparison. */ #define sa_equal(a1, a2) \ (bcmp((a1), (a2), ((a1))->sa_len) == 0) #define sa_dl_equal(a1, a2) \ ((((struct sockaddr_dl *)(a1))->sdl_len == \ ((struct sockaddr_dl *)(a2))->sdl_len) && \ (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ LLADDR((struct sockaddr_dl *)(a2)), \ ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) /* * Locate an interface based on a complete address. */ /*ARGSUSED*/ static struct ifaddr * ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) { struct ifnet *ifp; struct ifaddr *ifa; IFNET_RLOCK_NOSLEEP(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) { IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != addr->sa_family) continue; if (sa_equal(addr, ifa->ifa_addr)) { if (getref) ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); goto done; } /* IP6 doesn't have broadcast */ if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && ifa->ifa_broadaddr->sa_len != 0 && sa_equal(ifa->ifa_broadaddr, addr)) { if (getref) ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); goto done; } } IF_ADDR_UNLOCK(ifp); } ifa = NULL; done: IFNET_RUNLOCK_NOSLEEP(); return (ifa); } struct ifaddr * ifa_ifwithaddr(struct sockaddr *addr) { return (ifa_ifwithaddr_internal(addr, 1)); } int ifa_ifwithaddr_check(struct sockaddr *addr) { return (ifa_ifwithaddr_internal(addr, 0) != NULL); } /* * Locate an interface based on the broadcast address. */ /* ARGSUSED */ struct ifaddr * ifa_ifwithbroadaddr(struct sockaddr *addr) { struct ifnet *ifp; struct ifaddr *ifa; IFNET_RLOCK_NOSLEEP(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) { IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != addr->sa_family) continue; if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr && ifa->ifa_broadaddr->sa_len != 0 && sa_equal(ifa->ifa_broadaddr, addr)) { ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); goto done; } } IF_ADDR_UNLOCK(ifp); } ifa = NULL; done: IFNET_RUNLOCK_NOSLEEP(); return (ifa); } /* * Locate the point to point interface with a given destination address. */ /*ARGSUSED*/ struct ifaddr * ifa_ifwithdstaddr(struct sockaddr *addr) { struct ifnet *ifp; struct ifaddr *ifa; IFNET_RLOCK_NOSLEEP(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) { if ((ifp->if_flags & IFF_POINTOPOINT) == 0) continue; IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != addr->sa_family) continue; if (ifa->ifa_dstaddr != NULL && sa_equal(addr, ifa->ifa_dstaddr)) { ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); goto done; } } IF_ADDR_UNLOCK(ifp); } ifa = NULL; done: IFNET_RUNLOCK_NOSLEEP(); return (ifa); } /* * Find an interface on a specific network. If many, choice * is most specific found. */ struct ifaddr * ifa_ifwithnet(struct sockaddr *addr) { struct ifnet *ifp; struct ifaddr *ifa; struct ifaddr *ifa_maybe = NULL; u_int af = addr->sa_family; char *addr_data = addr->sa_data, *cplim; /* * AF_LINK addresses can be looked up directly by their index number, * so do that if we can. */ if (af == AF_LINK) { struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; if (sdl->sdl_index && sdl->sdl_index <= V_if_index) return (ifaddr_byindex(sdl->sdl_index)); } /* * Scan though each interface, looking for ones that have addresses * in this address family. Maintain a reference on ifa_maybe once * we find one, as we release the IF_ADDR_LOCK() that kept it stable * when we move onto the next interface. */ IFNET_RLOCK_NOSLEEP(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) { IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { char *cp, *cp2, *cp3; if (ifa->ifa_addr->sa_family != af) next: continue; if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { /* * This is a bit broken as it doesn't * take into account that the remote end may * be a single node in the network we are * looking for. * The trouble is that we don't know the * netmask for the remote end. */ if (ifa->ifa_dstaddr != NULL && sa_equal(addr, ifa->ifa_dstaddr)) { ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); goto done; } } else { /* * if we have a special address handler, * then use it instead of the generic one. */ if (ifa->ifa_claim_addr) { if ((*ifa->ifa_claim_addr)(ifa, addr)) { ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); goto done; } continue; } /* * Scan all the bits in the ifa's address. * If a bit dissagrees with what we are * looking for, mask it with the netmask * to see if it really matters. * (A byte at a time) */ if (ifa->ifa_netmask == 0) continue; cp = addr_data; cp2 = ifa->ifa_addr->sa_data; cp3 = ifa->ifa_netmask->sa_data; cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; while (cp3 < cplim) if ((*cp++ ^ *cp2++) & *cp3++) goto next; /* next address! */ /* * If the netmask of what we just found * is more specific than what we had before * (if we had one) then remember the new one * before continuing to search * for an even better one. */ if (ifa_maybe == NULL || rn_refines((caddr_t)ifa->ifa_netmask, (caddr_t)ifa_maybe->ifa_netmask)) { if (ifa_maybe != NULL) ifa_free(ifa_maybe); ifa_maybe = ifa; ifa_ref(ifa_maybe); } } } IF_ADDR_UNLOCK(ifp); } ifa = ifa_maybe; ifa_maybe = NULL; done: IFNET_RUNLOCK_NOSLEEP(); if (ifa_maybe != NULL) ifa_free(ifa_maybe); return (ifa); } /* * Find an interface address specific to an interface best matching * a given address. */ struct ifaddr * ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) { struct ifaddr *ifa; char *cp, *cp2, *cp3; char *cplim; struct ifaddr *ifa_maybe = NULL; u_int af = addr->sa_family; if (af >= AF_MAX) return (0); IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != af) continue; if (ifa_maybe == NULL) ifa_maybe = ifa; if (ifa->ifa_netmask == 0) { if (sa_equal(addr, ifa->ifa_addr) || (ifa->ifa_dstaddr && sa_equal(addr, ifa->ifa_dstaddr))) goto done; continue; } if (ifp->if_flags & IFF_POINTOPOINT) { if (sa_equal(addr, ifa->ifa_dstaddr)) goto done; } else { cp = addr->sa_data; cp2 = ifa->ifa_addr->sa_data; cp3 = ifa->ifa_netmask->sa_data; cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; for (; cp3 < cplim; cp3++) if ((*cp++ ^ *cp2++) & *cp3) break; if (cp3 == cplim) goto done; } } ifa = ifa_maybe; done: if (ifa != NULL) ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); return (ifa); } #include /* * Default action when installing a route with a Link Level gateway. * Lookup an appropriate real ifa to point to. * This should be moved to /sys/net/link.c eventually. */ static void link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) { struct ifaddr *ifa, *oifa; struct sockaddr *dst; struct ifnet *ifp; RT_LOCK_ASSERT(rt); if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) return; ifa = ifaof_ifpforaddr(dst, ifp); if (ifa) { oifa = rt->rt_ifa; rt->rt_ifa = ifa; ifa_free(oifa); if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) ifa->ifa_rtrequest(cmd, rt, info); } } /* * Mark an interface down and notify protocols of * the transition. * NOTE: must be called at splnet or eqivalent. */ static void if_unroute(struct ifnet *ifp, int flag, int fam) { struct ifaddr *ifa; KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); ifp->if_flags &= ~flag; getmicrotime(&ifp->if_lastchange); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) pfctlinput(PRC_IFDOWN, ifa->ifa_addr); ifp->if_qflush(ifp); #if defined(INET) || defined(INET6) #ifdef DEV_CARP if (ifp->if_carp) carp_carpdev_state(ifp->if_carp); #endif #endif rt_ifmsg(ifp); } /* * Mark an interface up and notify protocols of * the transition. * NOTE: must be called at splnet or eqivalent. */ static void if_route(struct ifnet *ifp, int flag, int fam) { struct ifaddr *ifa; KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); ifp->if_flags |= flag; getmicrotime(&ifp->if_lastchange); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) pfctlinput(PRC_IFUP, ifa->ifa_addr); #if defined(INET) || defined(INET6) #ifdef DEV_CARP if (ifp->if_carp) carp_carpdev_state(ifp->if_carp); #endif #endif rt_ifmsg(ifp); #ifdef INET6 in6_if_up(ifp); #endif } void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ /* * Handle a change in the interface link state. To avoid LORs * between driver lock and upper layer locks, as well as possible * recursions, we post event to taskqueue, and all job * is done in static do_link_state_change(). */ void if_link_state_change(struct ifnet *ifp, int link_state) { /* Return if state hasn't changed. */ if (ifp->if_link_state == link_state) return; ifp->if_link_state = link_state; taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); } static void do_link_state_change(void *arg, int pending) { struct ifnet *ifp = (struct ifnet *)arg; int link_state = ifp->if_link_state; CURVNET_SET(ifp->if_vnet); /* Notify that the link state has changed. */ rt_ifmsg(ifp); if (ifp->if_vlantrunk != NULL) (*vlan_link_state_p)(ifp); if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && IFP2AC(ifp)->ac_netgraph != NULL) (*ng_ether_link_state_p)(ifp, link_state); #if defined(INET) || defined(INET6) #ifdef DEV_CARP if (ifp->if_carp) carp_carpdev_state(ifp->if_carp); #endif #endif if (ifp->if_bridge) { KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); (*bstp_linkstate_p)(ifp, link_state); } if (ifp->if_lagg) { KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); (*lagg_linkstate_p)(ifp, link_state); } if (IS_DEFAULT_VNET(curvnet)) devctl_notify("IFNET", ifp->if_xname, (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); if (pending > 1) if_printf(ifp, "%d link states coalesced\n", pending); if (log_link_state_change) log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); CURVNET_RESTORE(); } /* * Mark an interface down and notify protocols of * the transition. * NOTE: must be called at splnet or eqivalent. */ void if_down(struct ifnet *ifp) { if_unroute(ifp, IFF_UP, AF_UNSPEC); } /* * Mark an interface up and notify protocols of * the transition. * NOTE: must be called at splnet or eqivalent. */ void if_up(struct ifnet *ifp) { if_route(ifp, IFF_UP, AF_UNSPEC); } /* * Flush an interface queue. */ void if_qflush(struct ifnet *ifp) { struct mbuf *m, *n; struct ifaltq *ifq; ifq = &ifp->if_snd; IFQ_LOCK(ifq); #ifdef ALTQ if (ALTQ_IS_ENABLED(ifq)) ALTQ_PURGE(ifq); #endif n = ifq->ifq_head; while ((m = n) != 0) { n = m->m_act; m_freem(m); } ifq->ifq_head = 0; ifq->ifq_tail = 0; ifq->ifq_len = 0; IFQ_UNLOCK(ifq); } /* * Map interface name to interface structure pointer, with or without * returning a reference. */ struct ifnet * ifunit_ref(const char *name) { struct ifnet *ifp; IFNET_RLOCK_NOSLEEP(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) { if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && !(ifp->if_flags & IFF_DYING)) break; } if (ifp != NULL) if_ref(ifp); IFNET_RUNLOCK_NOSLEEP(); return (ifp); } struct ifnet * ifunit(const char *name) { struct ifnet *ifp; IFNET_RLOCK_NOSLEEP(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) { if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) break; } IFNET_RUNLOCK_NOSLEEP(); return (ifp); } /* * Hardware specific interface ioctls. */ static int ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) { struct ifreq *ifr; struct ifstat *ifs; int error = 0; int new_flags, temp_flags; size_t namelen, onamelen; size_t descrlen; char *descrbuf, *odescrbuf; char new_name[IFNAMSIZ]; struct ifaddr *ifa; struct sockaddr_dl *sdl; ifr = (struct ifreq *)data; switch (cmd) { case SIOCGIFINDEX: ifr->ifr_index = ifp->if_index; break; case SIOCGIFFLAGS: temp_flags = ifp->if_flags | ifp->if_drv_flags; ifr->ifr_flags = temp_flags & 0xffff; ifr->ifr_flagshigh = temp_flags >> 16; break; case SIOCGIFCAP: ifr->ifr_reqcap = ifp->if_capabilities; ifr->ifr_curcap = ifp->if_capenable; break; #ifdef MAC case SIOCGIFMAC: error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); break; #endif case SIOCGIFMETRIC: ifr->ifr_metric = ifp->if_metric; break; case SIOCGIFMTU: ifr->ifr_mtu = ifp->if_mtu; break; case SIOCGIFPHYS: ifr->ifr_phys = ifp->if_physical; break; case SIOCGIFDESCR: error = 0; sx_slock(&ifdescr_sx); - if (ifp->if_description == NULL) { - ifr->ifr_buffer.length = 0; + if (ifp->if_description == NULL) error = ENOMSG; - } else { + else { /* space for terminating nul */ descrlen = strlen(ifp->if_description) + 1; if (ifr->ifr_buffer.length < descrlen) - error = ENAMETOOLONG; + ifr->ifr_buffer.buffer = NULL; else error = copyout(ifp->if_description, ifr->ifr_buffer.buffer, descrlen); ifr->ifr_buffer.length = descrlen; } sx_sunlock(&ifdescr_sx); break; case SIOCSIFDESCR: error = priv_check(td, PRIV_NET_SETIFDESCR); if (error) return (error); /* * Copy only (length-1) bytes to make sure that * if_description is always nul terminated. The * length parameter is supposed to count the * terminating nul in. */ if (ifr->ifr_buffer.length > ifdescr_maxlen) return (ENAMETOOLONG); else if (ifr->ifr_buffer.length == 0) descrbuf = NULL; else { descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, M_WAITOK | M_ZERO); error = copyin(ifr->ifr_buffer.buffer, descrbuf, ifr->ifr_buffer.length - 1); if (error) { free(descrbuf, M_IFDESCR); break; } } sx_xlock(&ifdescr_sx); odescrbuf = ifp->if_description; ifp->if_description = descrbuf; sx_xunlock(&ifdescr_sx); getmicrotime(&ifp->if_lastchange); free(odescrbuf, M_IFDESCR); break; case SIOCSIFFLAGS: error = priv_check(td, PRIV_NET_SETIFFLAGS); if (error) return (error); /* * Currently, no driver owned flags pass the IFF_CANTCHANGE * check, so we don't need special handling here yet. */ new_flags = (ifr->ifr_flags & 0xffff) | (ifr->ifr_flagshigh << 16); if (ifp->if_flags & IFF_SMART) { /* Smart drivers twiddle their own routes */ } else if (ifp->if_flags & IFF_UP && (new_flags & IFF_UP) == 0) { int s = splimp(); if_down(ifp); splx(s); } else if (new_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { int s = splimp(); if_up(ifp); splx(s); } /* See if permanently promiscuous mode bit is about to flip */ if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { if (new_flags & IFF_PPROMISC) ifp->if_flags |= IFF_PROMISC; else if (ifp->if_pcount == 0) ifp->if_flags &= ~IFF_PROMISC; log(LOG_INFO, "%s: permanently promiscuous mode %s\n", ifp->if_xname, (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); } ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | (new_flags &~ IFF_CANTCHANGE); if (ifp->if_ioctl) { (void) (*ifp->if_ioctl)(ifp, cmd, data); } getmicrotime(&ifp->if_lastchange); break; case SIOCSIFCAP: error = priv_check(td, PRIV_NET_SETIFCAP); if (error) return (error); if (ifp->if_ioctl == NULL) return (EOPNOTSUPP); if (ifr->ifr_reqcap & ~ifp->if_capabilities) return (EINVAL); error = (*ifp->if_ioctl)(ifp, cmd, data); if (error == 0) getmicrotime(&ifp->if_lastchange); break; #ifdef MAC case SIOCSIFMAC: error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); break; #endif case SIOCSIFNAME: error = priv_check(td, PRIV_NET_SETIFNAME); if (error) return (error); error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); if (error != 0) return (error); if (new_name[0] == '\0') return (EINVAL); if (ifunit(new_name) != NULL) return (EEXIST); /* * XXX: Locking. Nothing else seems to lock if_flags, * and there are numerous other races with the * ifunit() checks not being atomic with namespace * changes (renames, vmoves, if_attach, etc). */ ifp->if_flags |= IFF_RENAMING; /* Announce the departure of the interface. */ rt_ifannouncemsg(ifp, IFAN_DEPARTURE); EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); log(LOG_INFO, "%s: changing name to '%s'\n", ifp->if_xname, new_name); strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); ifa = ifp->if_addr; IFA_LOCK(ifa); sdl = (struct sockaddr_dl *)ifa->ifa_addr; namelen = strlen(new_name); onamelen = sdl->sdl_nlen; /* * Move the address if needed. This is safe because we * allocate space for a name of length IFNAMSIZ when we * create this in if_attach(). */ if (namelen != onamelen) { bcopy(sdl->sdl_data + onamelen, sdl->sdl_data + namelen, sdl->sdl_alen); } bcopy(new_name, sdl->sdl_data, namelen); sdl->sdl_nlen = namelen; sdl = (struct sockaddr_dl *)ifa->ifa_netmask; bzero(sdl->sdl_data, onamelen); while (namelen != 0) sdl->sdl_data[--namelen] = 0xff; IFA_UNLOCK(ifa); EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); /* Announce the return of the interface. */ rt_ifannouncemsg(ifp, IFAN_ARRIVAL); ifp->if_flags &= ~IFF_RENAMING; break; #ifdef VIMAGE case SIOCSIFVNET: error = priv_check(td, PRIV_NET_SETIFVNET); if (error) return (error); error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); break; #endif case SIOCSIFMETRIC: error = priv_check(td, PRIV_NET_SETIFMETRIC); if (error) return (error); ifp->if_metric = ifr->ifr_metric; getmicrotime(&ifp->if_lastchange); break; case SIOCSIFPHYS: error = priv_check(td, PRIV_NET_SETIFPHYS); if (error) return (error); if (ifp->if_ioctl == NULL) return (EOPNOTSUPP); error = (*ifp->if_ioctl)(ifp, cmd, data); if (error == 0) getmicrotime(&ifp->if_lastchange); break; case SIOCSIFMTU: { u_long oldmtu = ifp->if_mtu; error = priv_check(td, PRIV_NET_SETIFMTU); if (error) return (error); if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) return (EINVAL); if (ifp->if_ioctl == NULL) return (EOPNOTSUPP); error = (*ifp->if_ioctl)(ifp, cmd, data); if (error == 0) { getmicrotime(&ifp->if_lastchange); rt_ifmsg(ifp); } /* * If the link MTU changed, do network layer specific procedure. */ if (ifp->if_mtu != oldmtu) { #ifdef INET6 nd6_setmtu(ifp); #endif } break; } case SIOCADDMULTI: case SIOCDELMULTI: if (cmd == SIOCADDMULTI) error = priv_check(td, PRIV_NET_ADDMULTI); else error = priv_check(td, PRIV_NET_DELMULTI); if (error) return (error); /* Don't allow group membership on non-multicast interfaces. */ if ((ifp->if_flags & IFF_MULTICAST) == 0) return (EOPNOTSUPP); /* Don't let users screw up protocols' entries. */ if (ifr->ifr_addr.sa_family != AF_LINK) return (EINVAL); if (cmd == SIOCADDMULTI) { struct ifmultiaddr *ifma; /* * Userland is only permitted to join groups once * via the if_addmulti() KPI, because it cannot hold * struct ifmultiaddr * between calls. It may also * lose a race while we check if the membership * already exists. */ IF_ADDR_LOCK(ifp); ifma = if_findmulti(ifp, &ifr->ifr_addr); IF_ADDR_UNLOCK(ifp); if (ifma != NULL) error = EADDRINUSE; else error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); } else { error = if_delmulti(ifp, &ifr->ifr_addr); } if (error == 0) getmicrotime(&ifp->if_lastchange); break; case SIOCSIFPHYADDR: case SIOCDIFPHYADDR: #ifdef INET6 case SIOCSIFPHYADDR_IN6: #endif case SIOCSLIFPHYADDR: case SIOCSIFMEDIA: case SIOCSIFGENERIC: error = priv_check(td, PRIV_NET_HWIOCTL); if (error) return (error); if (ifp->if_ioctl == NULL) return (EOPNOTSUPP); error = (*ifp->if_ioctl)(ifp, cmd, data); if (error == 0) getmicrotime(&ifp->if_lastchange); break; case SIOCGIFSTATUS: ifs = (struct ifstat *)data; ifs->ascii[0] = '\0'; case SIOCGIFPSRCADDR: case SIOCGIFPDSTADDR: case SIOCGLIFPHYADDR: case SIOCGIFMEDIA: case SIOCGIFGENERIC: if (ifp->if_ioctl == NULL) return (EOPNOTSUPP); error = (*ifp->if_ioctl)(ifp, cmd, data); break; case SIOCSIFLLADDR: error = priv_check(td, PRIV_NET_SETLLADDR); if (error) return (error); error = if_setlladdr(ifp, ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); EVENTHANDLER_INVOKE(iflladdr_event, ifp); break; case SIOCAIFGROUP: { struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; error = priv_check(td, PRIV_NET_ADDIFGROUP); if (error) return (error); if ((error = if_addgroup(ifp, ifgr->ifgr_group))) return (error); break; } case SIOCGIFGROUP: if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) return (error); break; case SIOCDIFGROUP: { struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; error = priv_check(td, PRIV_NET_DELIFGROUP); if (error) return (error); if ((error = if_delgroup(ifp, ifgr->ifgr_group))) return (error); break; } default: error = ENOIOCTL; break; } return (error); } /* * Interface ioctls. */ int ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) { struct ifnet *ifp; struct ifreq *ifr; int error; int oif_flags; switch (cmd) { case SIOCGIFCONF: case OSIOCGIFCONF: #ifdef __amd64__ case SIOCGIFCONF32: #endif return (ifconf(cmd, data)); } ifr = (struct ifreq *)data; switch (cmd) { #ifdef VIMAGE case SIOCSIFRVNET: error = priv_check(td, PRIV_NET_SETIFVNET); if (error) return (error); return (if_vmove_reclaim(td, ifr->ifr_name, ifr->ifr_jid)); #endif case SIOCIFCREATE: case SIOCIFCREATE2: error = priv_check(td, PRIV_NET_IFCREATE); if (error) return (error); return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); case SIOCIFDESTROY: error = priv_check(td, PRIV_NET_IFDESTROY); if (error) return (error); return if_clone_destroy(ifr->ifr_name); case SIOCIFGCLONERS: return (if_clone_list((struct if_clonereq *)data)); case SIOCGIFGMEMB: return (if_getgroupmembers((struct ifgroupreq *)data)); } ifp = ifunit_ref(ifr->ifr_name); if (ifp == NULL) return (ENXIO); error = ifhwioctl(cmd, ifp, data, td); if (error != ENOIOCTL) { if_rele(ifp); return (error); } oif_flags = ifp->if_flags; if (so->so_proto == NULL) { if_rele(ifp); return (EOPNOTSUPP); } #ifndef COMPAT_43 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, ifp, td)); if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) error = (*ifp->if_ioctl)(ifp, cmd, data); #else { u_long ocmd = cmd; switch (cmd) { case SIOCSIFDSTADDR: case SIOCSIFADDR: case SIOCSIFBRDADDR: case SIOCSIFNETMASK: #if BYTE_ORDER != BIG_ENDIAN if (ifr->ifr_addr.sa_family == 0 && ifr->ifr_addr.sa_len < 16) { ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; ifr->ifr_addr.sa_len = 16; } #else if (ifr->ifr_addr.sa_len == 0) ifr->ifr_addr.sa_len = 16; #endif break; case OSIOCGIFADDR: cmd = SIOCGIFADDR; break; case OSIOCGIFDSTADDR: cmd = SIOCGIFDSTADDR; break; case OSIOCGIFBRDADDR: cmd = SIOCGIFBRDADDR; break; case OSIOCGIFNETMASK: cmd = SIOCGIFNETMASK; } error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, ifp, td)); if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) error = (*ifp->if_ioctl)(ifp, cmd, data); switch (ocmd) { case OSIOCGIFADDR: case OSIOCGIFDSTADDR: case OSIOCGIFBRDADDR: case OSIOCGIFNETMASK: *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; } } #endif /* COMPAT_43 */ if ((oif_flags ^ ifp->if_flags) & IFF_UP) { #ifdef INET6 if (ifp->if_flags & IFF_UP) { int s = splimp(); in6_if_up(ifp); splx(s); } #endif } if_rele(ifp); return (error); } /* * The code common to handling reference counted flags, * e.g., in ifpromisc() and if_allmulti(). * The "pflag" argument can specify a permanent mode flag to check, * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. * * Only to be used on stack-owned flags, not driver-owned flags. */ static int if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) { struct ifreq ifr; int error; int oldflags, oldcount; /* Sanity checks to catch programming errors */ KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, ("%s: setting driver-owned flag %d", __func__, flag)); if (onswitch) KASSERT(*refcount >= 0, ("%s: increment negative refcount %d for flag %d", __func__, *refcount, flag)); else KASSERT(*refcount > 0, ("%s: decrement non-positive refcount %d for flag %d", __func__, *refcount, flag)); /* In case this mode is permanent, just touch refcount */ if (ifp->if_flags & pflag) { *refcount += onswitch ? 1 : -1; return (0); } /* Save ifnet parameters for if_ioctl() may fail */ oldcount = *refcount; oldflags = ifp->if_flags; /* * See if we aren't the only and touching refcount is enough. * Actually toggle interface flag if we are the first or last. */ if (onswitch) { if ((*refcount)++) return (0); ifp->if_flags |= flag; } else { if (--(*refcount)) return (0); ifp->if_flags &= ~flag; } /* Call down the driver since we've changed interface flags */ if (ifp->if_ioctl == NULL) { error = EOPNOTSUPP; goto recover; } ifr.ifr_flags = ifp->if_flags & 0xffff; ifr.ifr_flagshigh = ifp->if_flags >> 16; error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); if (error) goto recover; /* Notify userland that interface flags have changed */ rt_ifmsg(ifp); return (0); recover: /* Recover after driver error */ *refcount = oldcount; ifp->if_flags = oldflags; return (error); } /* * Set/clear promiscuous mode on interface ifp based on the truth value * of pswitch. The calls are reference counted so that only the first * "on" request actually has an effect, as does the final "off" request. * Results are undefined if the "off" and "on" requests are not matched. */ int ifpromisc(struct ifnet *ifp, int pswitch) { int error; int oldflags = ifp->if_flags; error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, &ifp->if_pcount, pswitch); /* If promiscuous mode status has changed, log a message */ if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) log(LOG_INFO, "%s: promiscuous mode %s\n", ifp->if_xname, (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); return (error); } /* * Return interface configuration * of system. List may be used * in later ioctl's (above) to get * other information. */ /*ARGSUSED*/ static int ifconf(u_long cmd, caddr_t data) { struct ifconf *ifc = (struct ifconf *)data; #ifdef __amd64__ struct ifconf32 *ifc32 = (struct ifconf32 *)data; struct ifconf ifc_swab; #endif struct ifnet *ifp; struct ifaddr *ifa; struct ifreq ifr; struct sbuf *sb; int error, full = 0, valid_len, max_len; #ifdef __amd64__ if (cmd == SIOCGIFCONF32) { ifc_swab.ifc_len = ifc32->ifc_len; ifc_swab.ifc_buf = (caddr_t)(uintptr_t)ifc32->ifc_buf; ifc = &ifc_swab; } #endif /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ max_len = MAXPHYS - 1; /* Prevent hostile input from being able to crash the system */ if (ifc->ifc_len <= 0) return (EINVAL); again: if (ifc->ifc_len <= max_len) { max_len = ifc->ifc_len; full = 1; } sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); max_len = 0; valid_len = 0; IFNET_RLOCK(); TAILQ_FOREACH(ifp, &V_ifnet, if_link) { int addrs; /* * Zero the ifr_name buffer to make sure we don't * disclose the contents of the stack. */ memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) >= sizeof(ifr.ifr_name)) { sbuf_delete(sb); IFNET_RUNLOCK(); return (ENAMETOOLONG); } addrs = 0; IF_ADDR_LOCK(ifp); TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { struct sockaddr *sa = ifa->ifa_addr; if (prison_if(curthread->td_ucred, sa) != 0) continue; addrs++; #ifdef COMPAT_43 if (cmd == OSIOCGIFCONF) { struct osockaddr *osa = (struct osockaddr *)&ifr.ifr_addr; ifr.ifr_addr = *sa; osa->sa_family = sa->sa_family; sbuf_bcat(sb, &ifr, sizeof(ifr)); max_len += sizeof(ifr); } else #endif if (sa->sa_len <= sizeof(*sa)) { ifr.ifr_addr = *sa; sbuf_bcat(sb, &ifr, sizeof(ifr)); max_len += sizeof(ifr); } else { sbuf_bcat(sb, &ifr, offsetof(struct ifreq, ifr_addr)); max_len += offsetof(struct ifreq, ifr_addr); sbuf_bcat(sb, sa, sa->sa_len); max_len += sa->sa_len; } if (!sbuf_overflowed(sb)) valid_len = sbuf_len(sb); } IF_ADDR_UNLOCK(ifp); if (addrs == 0) { bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); sbuf_bcat(sb, &ifr, sizeof(ifr)); max_len += sizeof(ifr); if (!sbuf_overflowed(sb)) valid_len = sbuf_len(sb); } } IFNET_RUNLOCK(); /* * If we didn't allocate enough space (uncommon), try again. If * we have already allocated as much space as we are allowed, * return what we've got. */ if (valid_len != max_len && !full) { sbuf_delete(sb); goto again; } ifc->ifc_len = valid_len; #ifdef __amd64__ if (cmd == SIOCGIFCONF32) ifc32->ifc_len = valid_len; #endif sbuf_finish(sb); error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); sbuf_delete(sb); return (error); } /* * Just like ifpromisc(), but for all-multicast-reception mode. */ int if_allmulti(struct ifnet *ifp, int onswitch) { return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); } struct ifmultiaddr * if_findmulti(struct ifnet *ifp, struct sockaddr *sa) { struct ifmultiaddr *ifma; IF_ADDR_LOCK_ASSERT(ifp); TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { if (sa->sa_family == AF_LINK) { if (sa_dl_equal(ifma->ifma_addr, sa)) break; } else { if (sa_equal(ifma->ifma_addr, sa)) break; } } return ifma; } /* * Allocate a new ifmultiaddr and initialize based on passed arguments. We * make copies of passed sockaddrs. The ifmultiaddr will not be added to * the ifnet multicast address list here, so the caller must do that and * other setup work (such as notifying the device driver). The reference * count is initialized to 1. */ static struct ifmultiaddr * if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, int mflags) { struct ifmultiaddr *ifma; struct sockaddr *dupsa; ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | M_ZERO); if (ifma == NULL) return (NULL); dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); if (dupsa == NULL) { free(ifma, M_IFMADDR); return (NULL); } bcopy(sa, dupsa, sa->sa_len); ifma->ifma_addr = dupsa; ifma->ifma_ifp = ifp; ifma->ifma_refcount = 1; ifma->ifma_protospec = NULL; if (llsa == NULL) { ifma->ifma_lladdr = NULL; return (ifma); } dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); if (dupsa == NULL) { free(ifma->ifma_addr, M_IFMADDR); free(ifma, M_IFMADDR); return (NULL); } bcopy(llsa, dupsa, llsa->sa_len); ifma->ifma_lladdr = dupsa; return (ifma); } /* * if_freemulti: free ifmultiaddr structure and possibly attached related * addresses. The caller is responsible for implementing reference * counting, notifying the driver, handling routing messages, and releasing * any dependent link layer state. */ static void if_freemulti(struct ifmultiaddr *ifma) { KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", ifma->ifma_refcount)); KASSERT(ifma->ifma_protospec == NULL, ("if_freemulti: protospec not NULL")); if (ifma->ifma_lladdr != NULL) free(ifma->ifma_lladdr, M_IFMADDR); free(ifma->ifma_addr, M_IFMADDR); free(ifma, M_IFMADDR); } /* * Register an additional multicast address with a network interface. * * - If the address is already present, bump the reference count on the * address and return. * - If the address is not link-layer, look up a link layer address. * - Allocate address structures for one or both addresses, and attach to the * multicast address list on the interface. If automatically adding a link * layer address, the protocol address will own a reference to the link * layer address, to be freed when it is freed. * - Notify the network device driver of an addition to the multicast address * list. * * 'sa' points to caller-owned memory with the desired multicast address. * * 'retifma' will be used to return a pointer to the resulting multicast * address reference, if desired. */ int if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) { struct ifmultiaddr *ifma, *ll_ifma; struct sockaddr *llsa; int error; /* * If the address is already present, return a new reference to it; * otherwise, allocate storage and set up a new address. */ IF_ADDR_LOCK(ifp); ifma = if_findmulti(ifp, sa); if (ifma != NULL) { ifma->ifma_refcount++; if (retifma != NULL) *retifma = ifma; IF_ADDR_UNLOCK(ifp); return (0); } /* * The address isn't already present; resolve the protocol address * into a link layer address, and then look that up, bump its * refcount or allocate an ifma for that also. If 'llsa' was * returned, we will need to free it later. */ llsa = NULL; ll_ifma = NULL; if (ifp->if_resolvemulti != NULL) { error = ifp->if_resolvemulti(ifp, &llsa, sa); if (error) goto unlock_out; } /* * Allocate the new address. Don't hook it up yet, as we may also * need to allocate a link layer multicast address. */ ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); if (ifma == NULL) { error = ENOMEM; goto free_llsa_out; } /* * If a link layer address is found, we'll need to see if it's * already present in the address list, or allocate is as well. * When this block finishes, the link layer address will be on the * list. */ if (llsa != NULL) { ll_ifma = if_findmulti(ifp, llsa); if (ll_ifma == NULL) { ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); if (ll_ifma == NULL) { --ifma->ifma_refcount; if_freemulti(ifma); error = ENOMEM; goto free_llsa_out; } TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, ifma_link); } else ll_ifma->ifma_refcount++; ifma->ifma_llifma = ll_ifma; } /* * We now have a new multicast address, ifma, and possibly a new or * referenced link layer address. Add the primary address to the * ifnet address list. */ TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); if (retifma != NULL) *retifma = ifma; /* * Must generate the message while holding the lock so that 'ifma' * pointer is still valid. */ rt_newmaddrmsg(RTM_NEWMADDR, ifma); IF_ADDR_UNLOCK(ifp); /* * We are certain we have added something, so call down to the * interface to let them know about it. */ if (ifp->if_ioctl != NULL) { (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); } if (llsa != NULL) free(llsa, M_IFMADDR); return (0); free_llsa_out: if (llsa != NULL) free(llsa, M_IFMADDR); unlock_out: IF_ADDR_UNLOCK(ifp); return (error); } /* * Delete a multicast group membership by network-layer group address. * * Returns ENOENT if the entry could not be found. If ifp no longer * exists, results are undefined. This entry point should only be used * from subsystems which do appropriate locking to hold ifp for the * duration of the call. * Network-layer protocol domains must use if_delmulti_ifma(). */ int if_delmulti(struct ifnet *ifp, struct sockaddr *sa) { struct ifmultiaddr *ifma; int lastref; #ifdef INVARIANTS struct ifnet *oifp; IFNET_RLOCK_NOSLEEP(); TAILQ_FOREACH(oifp, &V_ifnet, if_link) if (ifp == oifp) break; if (ifp != oifp) ifp = NULL; IFNET_RUNLOCK_NOSLEEP(); KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); #endif if (ifp == NULL) return (ENOENT); IF_ADDR_LOCK(ifp); lastref = 0; ifma = if_findmulti(ifp, sa); if (ifma != NULL) lastref = if_delmulti_locked(ifp, ifma, 0); IF_ADDR_UNLOCK(ifp); if (ifma == NULL) return (ENOENT); if (lastref && ifp->if_ioctl != NULL) { (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); } return (0); } /* * Delete all multicast group membership for an interface. * Should be used to quickly flush all multicast filters. */ void if_delallmulti(struct ifnet *ifp) { struct ifmultiaddr *ifma; struct ifmultiaddr *next; IF_ADDR_LOCK(ifp); TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) if_delmulti_locked(ifp, ifma, 0); IF_ADDR_UNLOCK(ifp); } /* * Delete a multicast group membership by group membership pointer. * Network-layer protocol domains must use this routine. * * It is safe to call this routine if the ifp disappeared. */ void if_delmulti_ifma(struct ifmultiaddr *ifma) { struct ifnet *ifp; int lastref; ifp = ifma->ifma_ifp; #ifdef DIAGNOSTIC if (ifp == NULL) { printf("%s: ifma_ifp seems to be detached\n", __func__); } else { struct ifnet *oifp; IFNET_RLOCK_NOSLEEP(); TAILQ_FOREACH(oifp, &V_ifnet, if_link) if (ifp == oifp) break; if (ifp != oifp) { printf("%s: ifnet %p disappeared\n", __func__, ifp); ifp = NULL; } IFNET_RUNLOCK_NOSLEEP(); } #endif /* * If and only if the ifnet instance exists: Acquire the address lock. */ if (ifp != NULL) IF_ADDR_LOCK(ifp); lastref = if_delmulti_locked(ifp, ifma, 0); if (ifp != NULL) { /* * If and only if the ifnet instance exists: * Release the address lock. * If the group was left: update the hardware hash filter. */ IF_ADDR_UNLOCK(ifp); if (lastref && ifp->if_ioctl != NULL) { (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); } } } /* * Perform deletion of network-layer and/or link-layer multicast address. * * Return 0 if the reference count was decremented. * Return 1 if the final reference was released, indicating that the * hardware hash filter should be reprogrammed. */ static int if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) { struct ifmultiaddr *ll_ifma; if (ifp != NULL && ifma->ifma_ifp != NULL) { KASSERT(ifma->ifma_ifp == ifp, ("%s: inconsistent ifp %p", __func__, ifp)); IF_ADDR_LOCK_ASSERT(ifp); } ifp = ifma->ifma_ifp; /* * If the ifnet is detaching, null out references to ifnet, * so that upper protocol layers will notice, and not attempt * to obtain locks for an ifnet which no longer exists. The * routing socket announcement must happen before the ifnet * instance is detached from the system. */ if (detaching) { #ifdef DIAGNOSTIC printf("%s: detaching ifnet instance %p\n", __func__, ifp); #endif /* * ifp may already be nulled out if we are being reentered * to delete the ll_ifma. */ if (ifp != NULL) { rt_newmaddrmsg(RTM_DELMADDR, ifma); ifma->ifma_ifp = NULL; } } if (--ifma->ifma_refcount > 0) return 0; /* * If this ifma is a network-layer ifma, a link-layer ifma may * have been associated with it. Release it first if so. */ ll_ifma = ifma->ifma_llifma; if (ll_ifma != NULL) { KASSERT(ifma->ifma_lladdr != NULL, ("%s: llifma w/o lladdr", __func__)); if (detaching) ll_ifma->ifma_ifp = NULL; /* XXX */ if (--ll_ifma->ifma_refcount == 0) { if (ifp != NULL) { TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, ifma_link); } if_freemulti(ll_ifma); } } if (ifp != NULL) TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); if_freemulti(ifma); /* * The last reference to this instance of struct ifmultiaddr * was released; the hardware should be notified of this change. */ return 1; } /* * Set the link layer address on an interface. * * At this time we only support certain types of interfaces, * and we don't allow the length of the address to change. */ int if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) { struct sockaddr_dl *sdl; struct ifaddr *ifa; struct ifreq ifr; IF_ADDR_LOCK(ifp); ifa = ifp->if_addr; if (ifa == NULL) { IF_ADDR_UNLOCK(ifp); return (EINVAL); } ifa_ref(ifa); IF_ADDR_UNLOCK(ifp); sdl = (struct sockaddr_dl *)ifa->ifa_addr; if (sdl == NULL) { ifa_free(ifa); return (EINVAL); } if (len != sdl->sdl_alen) { /* don't allow length to change */ ifa_free(ifa); return (EINVAL); } switch (ifp->if_type) { case IFT_ETHER: case IFT_FDDI: case IFT_XETHER: case IFT_ISO88025: case IFT_L2VLAN: case IFT_BRIDGE: case IFT_ARCNET: case IFT_IEEE8023ADLAG: case IFT_IEEE80211: bcopy(lladdr, LLADDR(sdl), len); ifa_free(ifa); break; default: ifa_free(ifa); return (ENODEV); } /* * If the interface is already up, we need * to re-init it in order to reprogram its * address filter. */ if ((ifp->if_flags & IFF_UP) != 0) { if (ifp->if_ioctl) { ifp->if_flags &= ~IFF_UP; ifr.ifr_flags = ifp->if_flags & 0xffff; ifr.ifr_flagshigh = ifp->if_flags >> 16; (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); ifp->if_flags |= IFF_UP; ifr.ifr_flags = ifp->if_flags & 0xffff; ifr.ifr_flagshigh = ifp->if_flags >> 16; (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); } #ifdef INET /* * Also send gratuitous ARPs to notify other nodes about * the address change. */ TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family == AF_INET) arp_ifinit(ifp, ifa); } #endif } return (0); } /* * The name argument must be a pointer to storage which will last as * long as the interface does. For physical devices, the result of * device_get_name(dev) is a good choice and for pseudo-devices a * static string works well. */ void if_initname(struct ifnet *ifp, const char *name, int unit) { ifp->if_dname = name; ifp->if_dunit = unit; if (unit != IF_DUNIT_NONE) snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); else strlcpy(ifp->if_xname, name, IFNAMSIZ); } int if_printf(struct ifnet *ifp, const char * fmt, ...) { va_list ap; int retval; retval = printf("%s: ", ifp->if_xname); va_start(ap, fmt); retval += vprintf(fmt, ap); va_end(ap); return (retval); } void if_start(struct ifnet *ifp) { (*(ifp)->if_start)(ifp); } /* * Backwards compatibility interface for drivers * that have not implemented it */ static int if_transmit(struct ifnet *ifp, struct mbuf *m) { int error; IFQ_HANDOFF(ifp, m, error); return (error); } int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) { int active = 0; IF_LOCK(ifq); if (_IF_QFULL(ifq)) { _IF_DROP(ifq); IF_UNLOCK(ifq); m_freem(m); return (0); } if (ifp != NULL) { ifp->if_obytes += m->m_pkthdr.len + adjust; if (m->m_flags & (M_BCAST|M_MCAST)) ifp->if_omcasts++; active = ifp->if_drv_flags & IFF_DRV_OACTIVE; } _IF_ENQUEUE(ifq, m); IF_UNLOCK(ifq); if (ifp != NULL && !active) (*(ifp)->if_start)(ifp); return (1); } void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f) { KASSERT(if_com_alloc[type] == NULL, ("if_register_com_alloc: %d already registered", type)); KASSERT(if_com_free[type] == NULL, ("if_register_com_alloc: %d free already registered", type)); if_com_alloc[type] = a; if_com_free[type] = f; } void if_deregister_com_alloc(u_char type) { KASSERT(if_com_alloc[type] != NULL, ("if_deregister_com_alloc: %d not registered", type)); KASSERT(if_com_free[type] != NULL, ("if_deregister_com_alloc: %d free not registered", type)); if_com_alloc[type] = NULL; if_com_free[type] = NULL; } #ifdef DDB static void if_show_ifnet(struct ifnet *ifp) { if (ifp == NULL) return; db_printf("%s:\n", ifp->if_xname); #define IF_DB_PRINTF(f, e) db_printf(" %s = " f "\n", #e, ifp->e); IF_DB_PRINTF("%s", if_dname); IF_DB_PRINTF("%d", if_dunit); IF_DB_PRINTF("%s", if_description); IF_DB_PRINTF("%u", if_index); IF_DB_PRINTF("%u", if_refcount); IF_DB_PRINTF("%d", if_index_reserved); IF_DB_PRINTF("%p", if_softc); IF_DB_PRINTF("%p", if_l2com); IF_DB_PRINTF("%p", if_vnet); IF_DB_PRINTF("%p", if_home_vnet); IF_DB_PRINTF("%p", if_addr); IF_DB_PRINTF("%p", if_llsoftc); IF_DB_PRINTF("%p", if_label); IF_DB_PRINTF("%u", if_pcount); IF_DB_PRINTF("0x%08x", if_flags); IF_DB_PRINTF("0x%08x", if_drv_flags); IF_DB_PRINTF("0x%08x", if_capabilities); IF_DB_PRINTF("0x%08x", if_capenable); IF_DB_PRINTF("%p", if_snd.ifq_head); IF_DB_PRINTF("%p", if_snd.ifq_tail); IF_DB_PRINTF("%d", if_snd.ifq_len); IF_DB_PRINTF("%d", if_snd.ifq_maxlen); IF_DB_PRINTF("%d", if_snd.ifq_drops); IF_DB_PRINTF("%p", if_snd.ifq_drv_head); IF_DB_PRINTF("%p", if_snd.ifq_drv_tail); IF_DB_PRINTF("%d", if_snd.ifq_drv_len); IF_DB_PRINTF("%d", if_snd.ifq_drv_maxlen); IF_DB_PRINTF("%d", if_snd.altq_type); IF_DB_PRINTF("%x", if_snd.altq_flags); #undef IF_DB_PRINTF } DB_SHOW_COMMAND(ifnet, db_show_ifnet) { if (!have_addr) { db_printf("usage: show ifnet \n"); return; } if_show_ifnet((struct ifnet *)addr); } DB_SHOW_ALL_COMMAND(ifnets, db_show_all_ifnets) { VNET_ITERATOR_DECL(vnet_iter); struct ifnet *ifp; u_short idx; VNET_FOREACH(vnet_iter) { CURVNET_SET_QUIET(vnet_iter); #ifdef VIMAGE db_printf("vnet=%p\n", curvnet); #endif for (idx = 1; idx <= V_if_index; idx++) { ifp = V_ifindex_table[idx].ife_ifnet; if (ifp == NULL) continue; db_printf( "%20s ifp=%p\n", ifp->if_xname, ifp); if (db_pager_quit) break; } CURVNET_RESTORE(); } } #endif