X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/378393581903b274cb7a4d18e0d978071a6b592d..bca245acd4c03fd752d1a45f011ad495e60fe53d:/bsd/net/if_gif.c?ds=sidebyside diff --git a/bsd/net/if_gif.c b/bsd/net/if_gif.c index 6db06ef62..0ada425b6 100644 --- a/bsd/net/if_gif.c +++ b/bsd/net/if_gif.c @@ -1,26 +1,32 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2018 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. - * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ + * + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. - * - * @APPLE_LICENSE_HEADER_END@ + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ -/* $FreeBSD: src/sys/net/if_gif.c,v 1.4.2.6 2001/07/24 19:10:18 brooks Exp $ */ -/* $KAME: if_gif.c,v 1.47 2001/05/01 05:28:42 itojun Exp $ */ +/* $FreeBSD: src/sys/net/if_gif.c,v 1.4.2.6 2001/07/24 19:10:18 brooks Exp $ */ +/* $KAME: if_gif.c,v 1.47 2001/05/01 05:28:42 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. @@ -50,6 +56,12 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ +/* + * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce + * support for mandatory and extensible security protections. This notice + * is included in support of clause 2.2 (b) of the Apple Public License, + * Version 2.0. + */ #include #include @@ -63,20 +75,24 @@ #include #include #include +#include #include #include #include #include +#include +#include +#include #include #include #include -#if INET +#if INET #include #include #include -#endif /* INET */ +#endif /* INET */ #if INET6 #include @@ -92,67 +108,65 @@ #include -#define GIFNAME "gif" -#define GIFDEV "if_gif" -#define GIF_MAXUNIT 0x7fff /* ifp->if_unit is only 15 bits */ - -#ifndef __APPLE__ -static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface"); +#if CONFIG_MACF_NET +#include #endif -TAILQ_HEAD(gifhead, gif_softc) gifs = TAILQ_HEAD_INITIALIZER(gifs); +#define GIFNAME "gif" +#define GIFDEV "if_gif" -#ifdef __APPLE__ -void gifattach(void); -int gif_pre_output(struct ifnet *ifp, u_long protocol_family, struct mbuf **m0, - const struct sockaddr *dst, caddr_t rt, char *frame, char *address); -static void gif_create_dev(void); -static int gif_encapcheck(const struct mbuf*, int, int, void*); +#define GIF_MAXUNIT IF_MAXUNIT +#define GIF_ZONE_MAX_ELEM MIN(IFNETS_MAX, GIF_MAXUNIT) +/* gif lock variables */ +static lck_grp_t *gif_mtx_grp; +static lck_grp_attr_t *gif_mtx_grp_attr; +static lck_attr_t *gif_mtx_attr; +decl_lck_mtx_data(static, gif_mtx_data); +static lck_mtx_t *gif_mtx = &gif_mtx_data; -int ngif = 0; /* number of interfaces */ -#endif +TAILQ_HEAD(gifhead, gif_softc) gifs = TAILQ_HEAD_INITIALIZER(gifs); + +static int gif_encapcheck(const struct mbuf *, int, int, void *); +static errno_t gif_output(ifnet_t ifp, mbuf_t m); +static errno_t gif_input(ifnet_t ifp, protocol_family_t protocol_family, + mbuf_t m, char *frame_header); +static errno_t gif_ioctl(ifnet_t ifp, u_long cmd, void *data); + +static int ngif = 0; /* number of interfaces */ #if INET -struct protosw in_gif_protosw = -{ SOCK_RAW, 0, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR, - in_gif_input, 0, 0, 0, - 0, - 0, 0, 0, 0, - 0, - &rip_usrreqs, - 0, rip_unlock, 0 +static struct protosw in_gif_protosw = +{ + .pr_type = SOCK_RAW, + .pr_protocol = 0, /* IPPROTO_IPV[46] */ + .pr_flags = PR_ATOMIC | PR_ADDR, + .pr_input = in_gif_input, + .pr_usrreqs = &rip_usrreqs, + .pr_unlock = rip_unlock, }; #endif #if INET6 -struct ip6protosw in6_gif_protosw = -{ SOCK_RAW, 0, 0/*IPPROTO_IPV[46]*/, PR_ATOMIC|PR_ADDR, - in6_gif_input, 0, 0, 0, - 0, - 0, 0, 0, 0, - 0, - &rip6_usrreqs, - 0, rip_unlock, 0, - +static struct ip6protosw in6_gif_protosw = +{ + .pr_type = SOCK_RAW, + .pr_protocol = 0, /* IPPROTO_IPV[46] */ + .pr_flags = PR_ATOMIC | PR_ADDR, + .pr_input = in6_gif_input, + .pr_usrreqs = &rip6_usrreqs, + .pr_unlock = rip_unlock, }; #endif -#ifndef MAX_GIF_NEST -/* - * This macro controls the upper limitation on nesting of gif tunnels. - * Since, setting a large value to this macro with a careless configuration - * may introduce system crash, we don't allow any nestings by default. - * If you need to configure nested gif tunnels, you can define this macro - * in your kernel configuration file. However, if you do so, please be - * careful to configure the tunnels so that it won't make a loop. - */ -#define MAX_GIF_NEST 1 -#endif -static int max_gif_nesting = MAX_GIF_NEST; - - +static int gif_remove(struct ifnet *); +static int gif_clone_create(struct if_clone *, uint32_t, void *); +static int gif_clone_destroy(struct ifnet *); +static void gif_delete_tunnel(struct gif_softc *); +static void gif_detach(struct ifnet *); -#ifdef __APPLE__ +static struct if_clone gif_cloner = + IF_CLONE_INITIALIZER(GIFNAME, gif_clone_create, gif_clone_destroy, + 0, GIF_MAXUNIT, GIF_ZONE_MAX_ELEM, sizeof(struct gif_softc)); /* * Theory of operation: initially, one gif interface is created. * Any time a gif interface is configured, if there are no other @@ -164,185 +178,368 @@ static int max_gif_nesting = MAX_GIF_NEST; */ /* GIF interface module support */ -int gif_demux( - struct ifnet *ifp, - struct mbuf *m, - char *frame_header, - u_long *protocol_family) +static int +gif_demux( + ifnet_t ifp, + __unused mbuf_t m, + __unused char *frame_header, + protocol_family_t *protocol_family) { - struct gif_softc* gif = (struct gif_softc*)ifp->if_softc; - + struct gif_softc *sc = ifnet_softc(ifp); + + GIF_LOCK(sc); /* Only one protocol may be attached to a gif interface. */ - *protocol_family = gif->gif_proto; - + *protocol_family = sc->gif_proto; + GIF_UNLOCK(sc); + return 0; } -static -int gif_add_proto(struct ifnet *ifp, u_long protocol_family, struct ddesc_head_str *desc_head) +static errno_t +gif_add_proto( + ifnet_t ifp, + protocol_family_t protocol_family, + __unused const struct ifnet_demux_desc *demux_array, + __unused u_int32_t demux_count) { /* Only one protocol may be attached at a time */ - struct gif_softc* gif = (struct gif_softc*)ifp->if_softc; + struct gif_softc *sc = ifnet_softc(ifp); - if (gif->gif_proto != 0) - printf("gif_add_proto: request add_proto for gif%d\n", gif->gif_if.if_unit); + GIF_LOCK(sc); + if (sc->gif_proto != 0) { + printf("gif_add_proto: request add_proto for gif%d\n", + ifnet_unit(ifp)); + } - gif->gif_proto = protocol_family; + sc->gif_proto = protocol_family; + GIF_UNLOCK(sc); return 0; } -static -int gif_del_proto(struct ifnet *ifp, u_long protocol_family) +static errno_t +gif_del_proto( + ifnet_t ifp, + protocol_family_t protocol_family) { - if (((struct gif_softc*)ifp)->gif_proto == protocol_family) - ((struct gif_softc*)ifp)->gif_proto = 0; - else - return ENOENT; + struct gif_softc *sc = ifnet_softc(ifp); + + GIF_LOCK(sc); + if (sc->gif_proto == protocol_family) { + sc->gif_proto = 0; + } + GIF_UNLOCK(sc); return 0; } /* Glue code to attach inet to a gif interface through DLIL */ -int +static errno_t gif_attach_proto_family( - struct ifnet *ifp, - u_long protocol_family) + ifnet_t ifp, + protocol_family_t protocol_family) { - struct dlil_proto_reg_str reg; - int stat; + struct ifnet_attach_proto_param reg; + errno_t stat; bzero(®, sizeof(reg)); - TAILQ_INIT(®.demux_desc_head); - reg.interface_family = ifp->if_family; - reg.unit_number = ifp->if_unit; - reg.input = gif_input; - reg.pre_output = gif_pre_output; - reg.protocol_family = protocol_family; - - stat = dlil_attach_protocol(®); - if (stat && stat != EEXIST) { - panic("gif_attach_proto_family can't attach interface fam=%d\n", protocol_family); - } - - return stat; -} + reg.input = gif_input; -#endif + stat = ifnet_attach_protocol(ifp, protocol_family, ®); + if (stat && stat != EEXIST) { + printf("gif_attach_proto_family can't attach interface \ + fam=%d\n", protocol_family); + } + + return stat; +} /* Function to setup the first gif interface */ void -gifattach(void) +gif_init(void) { - int error; + errno_t result; - /* Init the list of interfaces */ + /* Initialize the list of interfaces */ TAILQ_INIT(&gifs); + /* Initialize the gif global lock */ + gif_mtx_grp_attr = lck_grp_attr_alloc_init(); + gif_mtx_grp = lck_grp_alloc_init("gif", gif_mtx_grp_attr); + gif_mtx_attr = lck_attr_alloc_init(); + lck_mtx_init(gif_mtx, gif_mtx_grp, gif_mtx_attr); + /* Register protocol registration functions */ - if ( error = dlil_reg_proto_module(AF_INET, APPLE_IF_FAM_GIF, gif_attach_proto_family, NULL) != 0) - printf("dlil_reg_proto_module failed for AF_INET error=%d\n", error); - - if ( error = dlil_reg_proto_module(AF_INET6, APPLE_IF_FAM_GIF, gif_attach_proto_family, NULL) != 0) - printf("dlil_reg_proto_module failed for AF_INET6 error=%d\n", error); - - /* Create first device */ - gif_create_dev(); + result = proto_register_plumber(PF_INET, APPLE_IF_FAM_GIF, + gif_attach_proto_family, NULL); + if (result != 0) { + printf("proto_register_plumber failed for AF_INET error=%d\n", + result); + } + + result = proto_register_plumber(PF_INET6, APPLE_IF_FAM_GIF, + gif_attach_proto_family, NULL); + if (result != 0) { + printf("proto_register_plumber failed for AF_INET6 error=%d\n", + result); + } + + result = if_clone_attach(&gif_cloner); + if (result != 0) { + panic("%s: if_clone_attach() failed, error %d\n", __func__, result); + } + + gif_clone_create(&gif_cloner, 0, NULL); +} + +static errno_t +gif_set_bpf_tap( + ifnet_t ifp, + bpf_tap_mode mode, + bpf_packet_func callback) +{ + struct gif_softc *sc = ifnet_softc(ifp); + + GIF_LOCK(sc); + sc->tap_mode = mode; + sc->tap_callback = callback; + GIF_UNLOCK(sc); + + return 0; } -/* Creates another gif device if there are none free */ static void -gif_create_dev(void) +gif_detach(struct ifnet *ifp) { - struct gif_softc *sc; - - + struct gif_softc *sc = ifp->if_softc; + lck_mtx_destroy(&sc->gif_lock, gif_mtx_grp); + if_clone_softc_deallocate(&gif_cloner, sc); + ifp->if_softc = NULL; + (void) ifnet_release(ifp); +} + +static int +gif_clone_create(struct if_clone *ifc, uint32_t unit, __unused void *params) +{ + struct gif_softc *sc = NULL; + struct ifnet_init_eparams gif_init_params; + errno_t error = 0; + + lck_mtx_lock(gif_mtx); + /* Can't create more than GIF_MAXUNIT */ - if (ngif >= GIF_MAXUNIT) - return; - - /* Check for unused gif interface */ - TAILQ_FOREACH(sc, &gifs, gif_link) { - /* If unused, return, no need to create a new interface */ - if ((sc->gif_if.if_flags & IFF_RUNNING) == 0) - return; + if (ngif >= GIF_MAXUNIT) { + error = ENXIO; + goto done; } - sc = _MALLOC(sizeof(struct gif_softc), M_DEVBUF, M_WAITOK); + sc = if_clone_softc_allocate(&gif_cloner); if (sc == NULL) { - log(LOG_ERR, "gifattach: failed to allocate gif%d\n", ngif); - return; + log(LOG_ERR, "gif_clone_create: failed to allocate gif%d\n", + unit); + error = ENOBUFS; + goto done; + } + + /* use the interface name as the unique id for ifp recycle */ + snprintf(sc->gif_ifname, sizeof(sc->gif_ifname), "%s%d", + ifc->ifc_name, unit); + + lck_mtx_init(&sc->gif_lock, gif_mtx_grp, gif_mtx_attr); + + bzero(&gif_init_params, sizeof(gif_init_params)); + gif_init_params.ver = IFNET_INIT_CURRENT_VERSION; + gif_init_params.len = sizeof(gif_init_params); + gif_init_params.flags = IFNET_INIT_LEGACY; + gif_init_params.uniqueid = sc->gif_ifname; + gif_init_params.uniqueid_len = strlen(sc->gif_ifname); + gif_init_params.name = GIFNAME; + gif_init_params.unit = unit; + gif_init_params.type = IFT_GIF; + gif_init_params.family = IFNET_FAMILY_GIF; + gif_init_params.output = gif_output; + gif_init_params.demux = gif_demux; + gif_init_params.add_proto = gif_add_proto; + gif_init_params.del_proto = gif_del_proto; + gif_init_params.softc = sc; + gif_init_params.ioctl = gif_ioctl; + gif_init_params.set_bpf_tap = gif_set_bpf_tap; + gif_init_params.detach = gif_detach; + + error = ifnet_allocate_extended(&gif_init_params, &sc->gif_if); + if (error != 0) { + printf("gif_clone_create, ifnet_allocate failed - %d\n", error); + if_clone_softc_deallocate(&gif_cloner, sc); + error = ENOBUFS; + goto done; } - bzero(sc, sizeof(struct gif_softc)); - sc->gif_if.if_softc = sc; - sc->gif_if.if_name = GIFNAME; - sc->gif_if.if_unit = ngif; - sc->encap_cookie4 = sc->encap_cookie6 = NULL; -#ifdef INET +#if INET sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck, &in_gif_protosw, sc); if (sc->encap_cookie4 == NULL) { - printf("%s: unable to attach encap4\n", if_name(&sc->gif_if)); - FREE(sc, M_DEVBUF); - return; + printf("%s: unable to attach encap4\n", if_name(sc->gif_if)); + ifnet_release(sc->gif_if); + if_clone_softc_deallocate(&gif_cloner, sc); + error = ENOBUFS; + goto done; } #endif -#ifdef INET6 +#if INET6 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, - gif_encapcheck, (struct protosw*)&in6_gif_protosw, sc); + gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc); if (sc->encap_cookie6 == NULL) { if (sc->encap_cookie4) { encap_detach(sc->encap_cookie4); sc->encap_cookie4 = NULL; } - printf("%s: unable to attach encap6\n", if_name(&sc->gif_if)); - FREE(sc, M_DEVBUF); - return; + printf("%s: unable to attach encap6\n", if_name(sc->gif_if)); + ifnet_release(sc->gif_if); + if_clone_softc_deallocate(&gif_cloner, sc); + error = ENOBUFS; + goto done; } #endif - sc->gif_called = 0; - sc->gif_if.if_family= APPLE_IF_FAM_GIF; - sc->gif_if.if_mtu = GIF_MTU; - sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; + ifnet_set_mtu(sc->gif_if, GIF_MTU); + ifnet_set_flags(sc->gif_if, IFF_POINTOPOINT | IFF_MULTICAST, 0xffff); #if 0 /* turn off ingress filter */ sc->gif_if.if_flags |= IFF_LINK2; #endif - sc->gif_if.if_demux = gif_demux; - sc->gif_if.if_ioctl = gif_ioctl; - sc->gif_if.if_output = NULL; /* pre_output returns error or EJUSTRETURN */ - sc->gif_if.if_type = IFT_GIF; - sc->gif_if.if_add_proto = gif_add_proto; - sc->gif_if.if_del_proto = gif_del_proto; - dlil_if_attach(&sc->gif_if); - bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); + sc->gif_flags |= IFGIF_DETACHING; + error = ifnet_attach(sc->gif_if, NULL); + if (error != 0) { + printf("gif_clone_create - ifnet_attach failed - %d\n", error); + ifnet_release(sc->gif_if); + if (sc->encap_cookie4) { + encap_detach(sc->encap_cookie4); + sc->encap_cookie4 = NULL; + } + if (sc->encap_cookie6) { + encap_detach(sc->encap_cookie6); + sc->encap_cookie6 = NULL; + } + if_clone_softc_deallocate(&gif_cloner, sc); + goto done; + } +#if CONFIG_MACF_NET + mac_ifnet_label_init(&sc->gif_if); +#endif + bpfattach(sc->gif_if, DLT_NULL, sizeof(u_int)); + sc->gif_flags &= ~IFGIF_DETACHING; TAILQ_INSERT_TAIL(&gifs, sc, gif_link); ngif++; +done: + lck_mtx_unlock(gif_mtx); + + return error; +} + +static int +gif_remove(struct ifnet *ifp) +{ + int error = 0; + struct gif_softc *sc = NULL; + const struct encaptab *encap_cookie4 = NULL; + const struct encaptab *encap_cookie6 = NULL; + + lck_mtx_lock(gif_mtx); + sc = ifp->if_softc; + + if (sc == NULL) { + error = EINVAL; + goto done; + } + + GIF_LOCK(sc); + if (sc->gif_flags & IFGIF_DETACHING) { + error = EINVAL; + goto done; + } + + sc->gif_flags |= IFGIF_DETACHING; + TAILQ_REMOVE(&gifs, sc, gif_link); + ngif--; + + gif_delete_tunnel(sc); +#ifdef INET6 + encap_cookie6 = sc->encap_cookie6; +#endif +#ifdef INET + encap_cookie4 = sc->encap_cookie4; +#endif +done: + if (sc != NULL) { + GIF_UNLOCK(sc); + } + lck_mtx_unlock(gif_mtx); + + if (encap_cookie6 != NULL) { + error = encap_detach(encap_cookie6); + KASSERT(error == 0, ("gif_clone_destroy: Unexpected " + "error detaching encap_cookie6")); + } + + if (encap_cookie4 != NULL) { + error = encap_detach(encap_cookie4); + KASSERT(error == 0, ("gif_clone_destroy: Unexpected " + "error detaching encap_cookie4")); + } + + return error; +} + +static int +gif_clone_destroy(struct ifnet *ifp) +{ + int error = 0; + + error = gif_remove(ifp); + if (error != 0) { + printf("gif_clone_destroy: gif remove failed %d\n", error); + return error; + } + + error = ifnet_set_flags(ifp, 0, IFF_UP); + if (error != 0) { + printf("gif_clone_destroy: ifnet_set_flags failed %d\n", error); + } + + error = ifnet_detach(ifp); + if (error != 0) { + panic("gif_clone_destroy: ifnet_detach(%p) failed %d\n", ifp, + error); + } + return 0; } static int -gif_encapcheck(m, off, proto, arg) - const struct mbuf *m; - int off; - int proto; - void *arg; +gif_encapcheck( + const struct mbuf *m, + int off, + int proto, + void *arg) { + int error = 0; struct ip ip; struct gif_softc *sc; sc = (struct gif_softc *)arg; - if (sc == NULL) - return 0; + if (sc == NULL) { + return error; + } - if ((sc->gif_if.if_flags & IFF_UP) == 0) - return 0; + GIF_LOCK(sc); + if ((ifnet_flags(sc->gif_if) & IFF_UP) == 0) { + goto done; + } /* no physical address */ - if (!sc->gif_psrc || !sc->gif_pdst) - return 0; + if (!sc->gif_psrc || !sc->gif_pdst) { + goto done; + } switch (proto) { #if INET @@ -354,90 +551,68 @@ gif_encapcheck(m, off, proto, arg) break; #endif default: - return 0; + goto done; } - /* LINTED const cast */ - m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); + mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof(ip), &ip); switch (ip.ip_v) { #if INET case 4: if (sc->gif_psrc->sa_family != AF_INET || - sc->gif_pdst->sa_family != AF_INET) - return 0; - return gif_encapcheck4(m, off, proto, arg); + sc->gif_pdst->sa_family != AF_INET) { + goto done; + } + error = gif_encapcheck4(m, off, proto, arg); #endif #if INET6 case 6: if (sc->gif_psrc->sa_family != AF_INET6 || - sc->gif_pdst->sa_family != AF_INET6) - return 0; - return gif_encapcheck6(m, off, proto, arg); + sc->gif_pdst->sa_family != AF_INET6) { + goto done; + } + error = gif_encapcheck6(m, off, proto, arg); #endif default: - return 0; + goto done; } +done: + GIF_UNLOCK(sc); + return error; } -int -gif_pre_output( - struct ifnet *ifp, - u_long protocol_family, - struct mbuf **m0, - const struct sockaddr *dst, - caddr_t rt, - char *frame, - char *address) +static errno_t +gif_output( + ifnet_t ifp, + mbuf_t m) { - struct gif_softc *sc = (struct gif_softc*)ifp; - register struct mbuf * m = *m0; + struct gif_softc *sc = ifnet_softc(ifp); + struct sockaddr *gif_psrc; + struct sockaddr *gif_pdst; int error = 0; - + + GIF_LOCK(sc); + gif_psrc = sc->gif_psrc; + gif_pdst = sc->gif_pdst; + GIF_UNLOCK(sc); + /* - * gif may cause infinite recursion calls when misconfigured. - * We'll prevent this by introducing upper limit. - * XXX: this mechanism may introduce another problem about - * mutual exclusion of the variable CALLED, especially if we - * use kernel thread. + * max_gif_nesting check used to live here. It doesn't anymore + * because there is no guaruntee that we won't be called + * concurrently from more than one thread. */ - if (++sc->gif_called > max_gif_nesting) { - log(LOG_NOTICE, - "gif_output: recursively called too many times(%d)\n", - sc->gif_called); - m_freem(m); /* free it here not in dlil_output*/ - error = EIO; /* is there better errno? */ - goto end; - } - - ifnet_touch_lastchange(ifp); - m->m_flags &= ~(M_BCAST|M_MCAST); - if (!(ifp->if_flags & IFF_UP) || - sc->gif_psrc == NULL || sc->gif_pdst == NULL) { - m_freem(m); /* free it here not in dlil_output */ + m->m_flags &= ~(M_BCAST | M_MCAST); + if (!(ifnet_flags(ifp) & IFF_UP) || + gif_psrc == NULL || gif_pdst == NULL) { + ifnet_touch_lastchange(ifp); + m_freem(m); /* free it here not in dlil_output */ error = ENETDOWN; goto end; } - if (ifp->if_bpf) { - /* - * We need to prepend the address family as - * a four byte field. Cons up a dummy header - * to pacify bpf. This is safe because bpf - * will only read from the mbuf (i.e., it won't - * try to free it or keep a pointer a to it). - */ - struct mbuf m0; - u_int32_t protocol_family = dst->sa_family; + bpf_tap_out(ifp, 0, m, &sc->gif_proto, sizeof(sc->gif_proto)); - m0.m_next = m; - m0.m_len = 4; - m0.m_data = (char *)&protocol_family; - - bpf_mtap(ifp, &m0); - } - ifp->if_opackets++; - ifp->if_obytes += m->m_pkthdr.len; + GIF_LOCK(sc); /* inner AF-specific encapsulation */ @@ -447,66 +622,46 @@ gif_pre_output( switch (sc->gif_psrc->sa_family) { #if INET case AF_INET: - error = in_gif_output(ifp, dst->sa_family, m, (struct rtentry*)rt); + error = in_gif_output(ifp, sc->gif_proto, m, NULL); break; #endif #if INET6 case AF_INET6: - error = in6_gif_output(ifp, dst->sa_family, m, (struct rtentry*)rt); + error = in6_gif_output(ifp, sc->gif_proto, m, NULL); break; #endif default: error = ENETDOWN; - goto end; + break; } - end: - sc->gif_called = 0; /* reset recursion counter */ + GIF_UNLOCK(sc); +end: if (error) { /* the mbuf was freed either by in_gif_output or in here */ - *m0 = NULL; /* avoid getting dlil_output freeing it */ - ifp->if_oerrors++; + ifnet_stat_increment_out(ifp, 0, 0, 1); + } else { + ifnet_stat_increment_out(ifp, 1, m->m_pkthdr.len, 0); } - if (error == 0) + if (error == 0) { error = EJUSTRETURN; /* if no error, packet got sent already */ + } return error; } -int +/* + * gif_input is the input handler for IP and IPv6 attached to gif + */ +static errno_t gif_input( - struct mbuf *m, - char* frame_header, - struct ifnet* gifp, - u_long protocol_family, - int sync_ok) + ifnet_t ifp, + protocol_family_t protocol_family, + mbuf_t m, + __unused char *frame_header) { + struct gif_softc *sc = ifnet_softc(ifp); - if (gifp == NULL) { - /* just in case */ - m_freem(m); - return; - } - - if (m->m_pkthdr.rcvif) - m->m_pkthdr.rcvif = gifp; - - if (gifp->if_bpf) { - /* - * We need to prepend the address family as - * a four byte field. Cons up a dummy header - * to pacify bpf. This is safe because bpf - * will only read from the mbuf (i.e., it won't - * try to free it or keep a pointer a to it). - */ - struct mbuf m0; - u_int32_t protocol_family1 = protocol_family; - - m0.m_next = m; - m0.m_len = 4; - m0.m_data = (char *)&protocol_family1; - - bpf_mtap(gifp, &m0); - } + bpf_tap_in(ifp, 0, m, &sc->gif_proto, sizeof(sc->gif_proto)); /* * Put the packet to the network layer input queue according to the @@ -520,33 +675,36 @@ gif_input( * it occurs more times than we thought, we may change the policy * again. */ - proto_input(protocol_family, m); - gifp->if_ipackets++; - gifp->if_ibytes += m->m_pkthdr.len; + int32_t pktlen = m->m_pkthdr.len; + if (proto_input(protocol_family, m) != 0) { + ifnet_stat_increment_in(ifp, 0, 0, 1); + m_freem(m); + } else { + ifnet_stat_increment_in(ifp, 1, pktlen, 0); + } - return (0); + return 0; } /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ -int -gif_ioctl(ifp, cmd, data) - struct ifnet *ifp; - u_long cmd; - void* data; +static errno_t +gif_ioctl( + ifnet_t ifp, + u_long cmd, + void *data) { - struct gif_softc *sc = (struct gif_softc*)ifp; - struct ifreq *ifr = (struct ifreq*)data; + struct gif_softc *sc = ifnet_softc(ifp); + struct ifreq *ifr = (struct ifreq *)data; int error = 0, size; - struct sockaddr *dst, *src; + struct sockaddr *dst = NULL, *src = NULL; struct sockaddr *sa; - int s; struct ifnet *ifp2; struct gif_softc *sc2; - + switch (cmd) { case SIOCSIFADDR: break; - + case SIOCSIFDSTADDR: break; @@ -554,67 +712,76 @@ gif_ioctl(ifp, cmd, data) case SIOCDELMULTI: break; -#ifdef SIOCSIFMTU /* xxx */ +#ifdef SIOCSIFMTU /* xxx */ case SIOCGIFMTU: break; case SIOCSIFMTU: - { - u_long mtu; - mtu = ifr->ifr_mtu; - if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { - return (EINVAL); - } - ifp->if_mtu = mtu; + { + u_int32_t mtu; + mtu = ifr->ifr_mtu; + if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { + return EINVAL; } - break; + ifnet_set_mtu(ifp, mtu); + } + break; #endif /* SIOCSIFMTU */ case SIOCSIFPHYADDR: #if INET6 - case SIOCSIFPHYADDR_IN6: + case SIOCSIFPHYADDR_IN6_32: + case SIOCSIFPHYADDR_IN6_64: #endif /* INET6 */ - case SIOCSLIFPHYADDR: switch (cmd) { #if INET case SIOCSIFPHYADDR: src = (struct sockaddr *) - &(((struct in_aliasreq *)data)->ifra_addr); + &(((struct in_aliasreq *)data)->ifra_addr); dst = (struct sockaddr *) - &(((struct in_aliasreq *)data)->ifra_dstaddr); + &(((struct in_aliasreq *)data)->ifra_dstaddr); break; #endif #if INET6 - case SIOCSIFPHYADDR_IN6: - src = (struct sockaddr *) - &(((struct in6_aliasreq *)data)->ifra_addr); - dst = (struct sockaddr *) - &(((struct in6_aliasreq *)data)->ifra_dstaddr); + case SIOCSIFPHYADDR_IN6_32: { + struct in6_aliasreq_32 *ifra_32 = + (struct in6_aliasreq_32 *)data; + + src = (struct sockaddr *)&ifra_32->ifra_addr; + dst = (struct sockaddr *)&ifra_32->ifra_dstaddr; break; + } + + case SIOCSIFPHYADDR_IN6_64: { + struct in6_aliasreq_64 *ifra_64 = + (struct in6_aliasreq_64 *)data; + + src = (struct sockaddr *)&ifra_64->ifra_addr; + dst = (struct sockaddr *)&ifra_64->ifra_dstaddr; + break; + } #endif - case SIOCSLIFPHYADDR: - src = (struct sockaddr *) - &(((struct if_laddrreq *)data)->addr); - dst = (struct sockaddr *) - &(((struct if_laddrreq *)data)->dstaddr); } /* sa_family must be equal */ - if (src->sa_family != dst->sa_family) + if (src->sa_family != dst->sa_family) { return EINVAL; + } /* validate sa_len */ switch (src->sa_family) { #if INET case AF_INET: - if (src->sa_len != sizeof(struct sockaddr_in)) + if (src->sa_len != sizeof(struct sockaddr_in)) { return EINVAL; + } break; #endif #if INET6 case AF_INET6: - if (src->sa_len != sizeof(struct sockaddr_in6)) + if (src->sa_len != sizeof(struct sockaddr_in6)) { return EINVAL; + } break; #endif default: @@ -623,14 +790,16 @@ gif_ioctl(ifp, cmd, data) switch (dst->sa_family) { #if INET case AF_INET: - if (dst->sa_len != sizeof(struct sockaddr_in)) + if (dst->sa_len != sizeof(struct sockaddr_in)) { return EINVAL; + } break; #endif #if INET6 case AF_INET6: - if (dst->sa_len != sizeof(struct sockaddr_in6)) + if (dst->sa_len != sizeof(struct sockaddr_in6)) { return EINVAL; + } break; #endif default: @@ -640,38 +809,65 @@ gif_ioctl(ifp, cmd, data) /* check sa_family looks sane for the cmd */ switch (cmd) { case SIOCSIFPHYADDR: - if (src->sa_family == AF_INET) + if (src->sa_family == AF_INET) { break; + } return EAFNOSUPPORT; #if INET6 - case SIOCSIFPHYADDR_IN6: - if (src->sa_family == AF_INET6) + case SIOCSIFPHYADDR_IN6_32: + case SIOCSIFPHYADDR_IN6_64: + if (src->sa_family == AF_INET6) { break; + } return EAFNOSUPPORT; #endif /* INET6 */ - case SIOCSLIFPHYADDR: - /* checks done in the above */ - break; } +#define GIF_ORDERED_LOCK(sc, sc2) \ + if (sc < sc2) { \ + GIF_LOCK(sc); \ + GIF_LOCK(sc2); \ + } else { \ + GIF_LOCK(sc2); \ + GIF_LOCK(sc); \ + } + +#define GIF_ORDERED_UNLOCK(sc, sc2) \ + if (sc > sc2) { \ + GIF_UNLOCK(sc); \ + GIF_UNLOCK(sc2); \ + } else { \ + GIF_UNLOCK(sc2); \ + GIF_UNLOCK(sc); \ + } + ifnet_head_lock_shared(); TAILQ_FOREACH(ifp2, &ifnet_head, if_link) { - if (strcmp(ifp2->if_name, GIFNAME) != 0) + if (strcmp(ifnet_name(ifp2), GIFNAME) != 0) { continue; - sc2 = ifp2->if_softc; - if (sc2 == sc) + } + sc2 = ifnet_softc(ifp2); + if (sc2 == sc) { continue; - if (!sc2->gif_pdst || !sc2->gif_psrc) + } + /* lock sc and sc2 in increasing order of ifnet index */ + GIF_ORDERED_LOCK(sc, sc2); + if (!sc2->gif_pdst || !sc2->gif_psrc) { + GIF_ORDERED_UNLOCK(sc, sc2); continue; + } if (sc2->gif_pdst->sa_family != dst->sa_family || sc2->gif_pdst->sa_len != dst->sa_len || sc2->gif_psrc->sa_family != src->sa_family || - sc2->gif_psrc->sa_len != src->sa_len) + sc2->gif_psrc->sa_len != src->sa_len) { + GIF_ORDERED_UNLOCK(sc, sc2); continue; + } #ifndef XBONEHACK /* can't configure same pair of address onto two gifs */ if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { + GIF_ORDERED_UNLOCK(sc, sc2); error = EADDRNOTAVAIL; ifnet_head_done(); goto bad; @@ -680,13 +876,15 @@ gif_ioctl(ifp, cmd, data) /* can't configure multiple multi-dest interfaces */ #define multidest(x) \ - (((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY) + (((struct sockaddr_in *)(void *)(x))->sin_addr.s_addr == INADDR_ANY) #if INET6 #define multidest6(x) \ - (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr)) + (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) \ + (void *)(x))->sin6_addr)) #endif if (dst->sa_family == AF_INET && multidest(dst) && multidest(sc2->gif_pdst)) { + GIF_ORDERED_UNLOCK(sc, sc2); error = EADDRNOTAVAIL; ifnet_head_done(); goto bad; @@ -694,58 +892,71 @@ gif_ioctl(ifp, cmd, data) #if INET6 if (dst->sa_family == AF_INET6 && multidest6(dst) && multidest6(sc2->gif_pdst)) { + GIF_ORDERED_UNLOCK(sc, sc2); error = EADDRNOTAVAIL; ifnet_head_done(); goto bad; } #endif + GIF_ORDERED_UNLOCK(sc, sc2); } ifnet_head_done(); - if (sc->gif_psrc) - FREE((caddr_t)sc->gif_psrc, M_IFADDR); - sa = (struct sockaddr *)_MALLOC(src->sa_len, M_IFADDR, M_WAITOK); + GIF_LOCK(sc); + if (sc->gif_psrc) { + FREE(sc->gif_psrc, M_IFADDR); + } + sa = (struct sockaddr *)_MALLOC(src->sa_len, M_IFADDR, + M_WAITOK); + if (sa == NULL) { + GIF_UNLOCK(sc); + return ENOBUFS; + } bcopy((caddr_t)src, (caddr_t)sa, src->sa_len); sc->gif_psrc = sa; - if (sc->gif_pdst) - FREE((caddr_t)sc->gif_pdst, M_IFADDR); - sa = (struct sockaddr *)_MALLOC(dst->sa_len, M_IFADDR, M_WAITOK); + if (sc->gif_pdst) { + FREE(sc->gif_pdst, M_IFADDR); + } + sa = (struct sockaddr *)_MALLOC(dst->sa_len, M_IFADDR, + M_WAITOK); + if (sa == NULL) { + GIF_UNLOCK(sc); + return ENOBUFS; + } bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len); sc->gif_pdst = sa; + GIF_UNLOCK(sc); - ifp->if_flags |= IFF_RUNNING; - - s = splimp(); - if_up(ifp); /* mark interface UP and send up RTM_IFINFO */ -#ifdef __APPLE__ - /* Make sure at least one unused device is still available */ - gif_create_dev(); -#endif - splx(s); + ifnet_set_flags(ifp, IFF_RUNNING | IFF_UP, IFF_RUNNING | + IFF_UP); error = 0; break; #ifdef SIOCDIFPHYADDR case SIOCDIFPHYADDR: + GIF_LOCK(sc); if (sc->gif_psrc) { - FREE((caddr_t)sc->gif_psrc, M_IFADDR); + FREE(sc->gif_psrc, M_IFADDR); sc->gif_psrc = NULL; } if (sc->gif_pdst) { - FREE((caddr_t)sc->gif_pdst, M_IFADDR); + FREE(sc->gif_pdst, M_IFADDR); sc->gif_pdst = NULL; } + GIF_UNLOCK(sc); /* change the IFF_{UP, RUNNING} flag as well? */ break; #endif - + case SIOCGIFPSRCADDR: #if INET6 case SIOCGIFPSRCADDR_IN6: #endif /* INET6 */ + GIF_LOCK(sc); if (sc->gif_psrc == NULL) { + GIF_UNLOCK(sc); error = EADDRNOTAVAIL; goto bad; } @@ -760,24 +971,30 @@ gif_ioctl(ifp, cmd, data) #if INET6 case SIOCGIFPSRCADDR_IN6: dst = (struct sockaddr *) - &(((struct in6_ifreq *)data)->ifr_addr); + &(((struct in6_ifreq *)data)->ifr_addr); size = sizeof(((struct in6_ifreq *)data)->ifr_addr); break; #endif /* INET6 */ default: + GIF_UNLOCK(sc); error = EADDRNOTAVAIL; goto bad; } - if (src->sa_len > size) + if (src->sa_len > size) { + GIF_UNLOCK(sc); return EINVAL; + } bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); + GIF_UNLOCK(sc); break; - + case SIOCGIFPDSTADDR: #if INET6 case SIOCGIFPDSTADDR_IN6: #endif /* INET6 */ + GIF_LOCK(sc); if (sc->gif_pdst == NULL) { + GIF_UNLOCK(sc); error = EADDRNOTAVAIL; goto bad; } @@ -792,42 +1009,21 @@ gif_ioctl(ifp, cmd, data) #if INET6 case SIOCGIFPDSTADDR_IN6: dst = (struct sockaddr *) - &(((struct in6_ifreq *)data)->ifr_addr); + &(((struct in6_ifreq *)data)->ifr_addr); size = sizeof(((struct in6_ifreq *)data)->ifr_addr); break; #endif /* INET6 */ default: error = EADDRNOTAVAIL; + GIF_UNLOCK(sc); goto bad; } - if (src->sa_len > size) + if (src->sa_len > size) { + GIF_UNLOCK(sc); return EINVAL; - bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); - break; - - case SIOCGLIFPHYADDR: - if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { - error = EADDRNOTAVAIL; - goto bad; } - - /* copy src */ - src = sc->gif_psrc; - dst = (struct sockaddr *) - &(((struct if_laddrreq *)data)->addr); - size = sizeof(((struct if_laddrreq *)data)->addr); - if (src->sa_len > size) - return EINVAL; - bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); - - /* copy dst */ - src = sc->gif_pdst; - dst = (struct sockaddr *) - &(((struct if_laddrreq *)data)->dstaddr); - size = sizeof(((struct if_laddrreq *)data)->dstaddr); - if (src->sa_len > size) - return EINVAL; bcopy((caddr_t)src, (caddr_t)dst, src->sa_len); + GIF_UNLOCK(sc); break; case SIOCSIFFLAGS: @@ -838,26 +1034,22 @@ gif_ioctl(ifp, cmd, data) error = EOPNOTSUPP; break; } - bad: +bad: return error; } -#ifndef __APPLE__ -/* This function is not used in our stack */ -void -gif_delete_tunnel(sc) - struct gif_softc *sc; +static void +gif_delete_tunnel(struct gif_softc *sc) { - /* XXX: NetBSD protects this function with splsoftnet() */ - + GIF_LOCK_ASSERT(sc); if (sc->gif_psrc) { - FREE((caddr_t)sc->gif_psrc, M_IFADDR); + FREE(sc->gif_psrc, M_IFADDR); sc->gif_psrc = NULL; } if (sc->gif_pdst) { - FREE((caddr_t)sc->gif_pdst, M_IFADDR); + FREE(sc->gif_pdst, M_IFADDR); sc->gif_pdst = NULL; } + ROUTE_RELEASE(&sc->gif_ro); /* change the IFF_UP flag as well? */ } -#endif