X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/2d21ac55c334faf3a56e5634905ed6987fc787d4..13f56ec4e58bf8687e2a68032c093c0213dd519b:/bsd/netinet6/scope6.c?ds=sidebyside diff --git a/bsd/netinet6/scope6.c b/bsd/netinet6/scope6.c index 76640cc32..2d4eedf76 100644 --- a/bsd/netinet6/scope6.c +++ b/bsd/netinet6/scope6.c @@ -1,3 +1,31 @@ +/* + * Copyright (c) 2009-2010 Apple Inc. All rights reserved. + * + * @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, 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/netinet6/scope6.c,v 1.3 2002/03/25 10:12:51 ume Exp $ */ /* $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $ */ @@ -36,6 +64,8 @@ #include #include #include +#include +#include #include #include @@ -45,17 +75,18 @@ #include #include -struct scope6_id { - /* - * 16 is correspondent to 4bit multicast scope field. - * i.e. from node-local to global with some reserved/unassigned types. - */ - u_int32_t s6id_list[16]; -}; -static size_t if_indexlim = 8; +extern lck_mtx_t *scope6_mutex; + +#ifdef ENABLE_DEFAULT_SCOPE +int ip6_use_defzone = 1; +#else +int ip6_use_defzone = 0; +#endif + +static size_t if_scope_indexlim = 8; struct scope6_id *scope6_ids = NULL; -void +int scope6_ifattach( struct ifnet *ifp) { @@ -63,17 +94,24 @@ scope6_ifattach( * We have some arrays that should be indexed by if_index. * since if_index will grow dynamically, they should grow too. */ - if (scope6_ids == NULL || if_index >= if_indexlim) { + lck_mtx_lock(scope6_mutex); + if (scope6_ids == NULL || if_index >= if_scope_indexlim) { size_t n; caddr_t q; + int newlim = if_scope_indexlim; - while (if_index >= if_indexlim) - if_indexlim <<= 1; + while (if_index >= newlim) + newlim <<= 1; /* grow scope index array */ - n = if_indexlim * sizeof(struct scope6_id); + n = newlim * sizeof(struct scope6_id); /* XXX: need new malloc type? */ q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); + if (q == NULL) { + lck_mtx_unlock(scope6_mutex); + return ENOBUFS; + } + if_scope_indexlim = newlim; bzero(q, n); if (scope6_ids) { bcopy((caddr_t)scope6_ids, q, n/2); @@ -86,13 +124,15 @@ scope6_ifattach( /* don't initialize if called twice */ if (SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]) { - return; + lck_mtx_unlock(scope6_mutex); + return 0; } /* * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard. * Should we rather hardcode here? */ + SID.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = ifp->if_index; SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; #if MULTI_SCOPE /* by default, we don't care about scope boundary for these scopes. */ @@ -100,6 +140,9 @@ scope6_ifattach( SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1; #endif #undef SID + lck_mtx_unlock(scope6_mutex); + + return 0; } int @@ -120,13 +163,14 @@ scope6_set( /* * TODO(XXX): after setting, we should reflect the changes to - * interface addresses, routing table entries, PCB entries... + * interface addresses, routing table entries, PCB entries... */ + lck_mtx_lock(scope6_mutex); for (i = 0; i < 16; i++) { if (idlist[i] && idlist[i] != scope6_ids[ifp->if_index].s6id_list[i]) { - if (i == IPV6_ADDR_SCOPE_LINKLOCAL && + if (i == IPV6_ADDR_SCOPE_INTFACELOCAL && idlist[i] > if_index) { /* * XXX: theoretically, there should be no @@ -134,6 +178,7 @@ scope6_set( * IDs, but we check the consistency for * safety in later use. */ + lck_mtx_unlock(scope6_mutex); return(EINVAL); } @@ -145,6 +190,7 @@ scope6_set( scope6_ids[ifp->if_index].s6id_list[i] = idlist[i]; } } + lck_mtx_unlock(scope6_mutex); return(error); } @@ -157,8 +203,10 @@ scope6_get( if (scope6_ids == NULL) /* paranoid? */ return(EINVAL); + lck_mtx_lock(scope6_mutex); bcopy(scope6_ids[ifp->if_index].s6id_list, idlist, sizeof(scope6_ids[ifp->if_index].s6id_list)); + lck_mtx_unlock(scope6_mutex); return(0); } @@ -198,8 +246,8 @@ struct in6_addr *addr; * return scope doesn't work. */ switch (scope) { - case IPV6_ADDR_SCOPE_NODELOCAL: - return IPV6_ADDR_SCOPE_NODELOCAL; + case IPV6_ADDR_SCOPE_INTFACELOCAL: + return IPV6_ADDR_SCOPE_INTFACELOCAL; break; case IPV6_ADDR_SCOPE_LINKLOCAL: return IPV6_ADDR_SCOPE_LINKLOCAL; @@ -213,11 +261,15 @@ struct in6_addr *addr; } } + /* + * Regard loopback and unspecified addresses as global, since + * they have no ambiguity. + */ if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) { if (addr->s6_addr8[15] == 1) /* loopback */ - return IPV6_ADDR_SCOPE_NODELOCAL; - if (addr->s6_addr8[15] == 0) /* unspecified */ return IPV6_ADDR_SCOPE_LINKLOCAL; + if (addr->s6_addr8[15] == 0) /* unspecified */ + return IPV6_ADDR_SCOPE_GLOBAL; /* XXX: correct? */ } return IPV6_ADDR_SCOPE_GLOBAL; @@ -230,30 +282,138 @@ in6_addr2scopeid( { int scope = in6_addrscope(addr); int index = ifp->if_index; + int retid = 0; if (scope6_ids == NULL) /* paranoid? */ return(0); /* XXX */ - if (index >= if_indexlim) + + lck_mtx_lock(scope6_mutex); + if (index >= if_scope_indexlim) { + lck_mtx_unlock(scope6_mutex); return(0); /* XXX */ + } #define SID scope6_ids[index] switch(scope) { case IPV6_ADDR_SCOPE_NODELOCAL: - return(-1); /* XXX: is this an appropriate value? */ - + retid = -1; /* XXX: is this an appropriate value? */ + break; case IPV6_ADDR_SCOPE_LINKLOCAL: - return(SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]); - + retid=SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]; + break; case IPV6_ADDR_SCOPE_SITELOCAL: - return(SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]); - + retid=SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]; + break; case IPV6_ADDR_SCOPE_ORGLOCAL: - return(SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]); - + retid=SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]; + break; default: - return(0); /* XXX: treat as global. */ + break; /* XXX: value 0, treat as global. */ } #undef SID + + lck_mtx_unlock(scope6_mutex); + return retid; +} + +/* + * Validate the specified scope zone ID in the sin6_scope_id field. If the ID + * is unspecified (=0), needs to be specified, and the default zone ID can be + * used, the default value will be used. + * This routine then generates the kernel-internal form: if the address scope + * of is interface-local or link-local, embed the interface index in the + * address. + */ +int +sa6_embedscope(struct sockaddr_in6 *sin6, int defaultok) +{ + struct ifnet *ifp; + u_int32_t zoneid; + + if ((zoneid = sin6->sin6_scope_id) == 0 && defaultok) + zoneid = scope6_addr2default(&sin6->sin6_addr); + + if (zoneid != 0 && + (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || + IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr))) { + /* + * At this moment, we only check interface-local and + * link-local scope IDs, and use interface indices as the + * zone IDs assuming a one-to-one mapping between interfaces + * and links. + */ + if (if_index < zoneid) + return (ENXIO); + ifnet_head_lock_shared(); + ifp = ifindex2ifnet[zoneid]; + if (ifp == NULL) {/* XXX: this can happen for some OS */ + ifnet_head_done(); + return (ENXIO); + } + ifnet_head_done(); + /* XXX assignment to 16bit from 32bit variable */ + sin6->sin6_addr.s6_addr16[1] = htons(zoneid & 0xffff); + + sin6->sin6_scope_id = 0; + } + + return 0; +} + +void +rtkey_to_sa6(struct rtentry *rt, struct sockaddr_in6 *sin6) +{ + VERIFY(rt_key(rt)->sa_family == AF_INET6); + + *sin6 = *((struct sockaddr_in6 *)rt_key(rt)); + sin6->sin6_scope_id = 0; +} + +void +rtgw_to_sa6(struct rtentry *rt, struct sockaddr_in6 *sin6) +{ + VERIFY(rt->rt_flags & RTF_GATEWAY); + + *sin6 = *((struct sockaddr_in6 *)rt->rt_gateway); + sin6->sin6_scope_id = 0; +} + +/* + * generate standard sockaddr_in6 from embedded form. + */ +int +sa6_recoverscope(struct sockaddr_in6 *sin6) +{ + u_int32_t zoneid; + + if (sin6->sin6_scope_id != 0) { + log(LOG_NOTICE, + "sa6_recoverscope: assumption failure (non 0 ID): %s%%%d\n", + ip6_sprintf(&sin6->sin6_addr), sin6->sin6_scope_id); + /* XXX: proceed anyway... */ + } + if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || + IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr)) { + /* + * KAME assumption: link id == interface id + */ + zoneid = ntohs(sin6->sin6_addr.s6_addr16[1]); + if (zoneid) { + /* sanity check */ + if (if_index < zoneid) + return (ENXIO); + ifnet_head_lock_shared(); + if (ifindex2ifnet[zoneid] == NULL) { + ifnet_head_done(); + return (ENXIO); + } + ifnet_head_done(); + sin6->sin6_addr.s6_addr16[1] = 0; + sin6->sin6_scope_id = zoneid; + } + } + + return 0; } void @@ -266,12 +426,17 @@ scope6_setdefault( * We might eventually have to separate the notion of "link" from * "interface" and provide a user interface to set the default. */ + lck_mtx_lock(scope6_mutex); if (ifp) { + scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = + ifp->if_index; scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; - } - else + } else { + scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL] = 0; scope6_ids[0].s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0; + } + lck_mtx_unlock(scope6_mutex); } int @@ -281,8 +446,10 @@ scope6_get_default( if (scope6_ids == NULL) /* paranoid? */ return(EINVAL); + lck_mtx_lock(scope6_mutex); bcopy(scope6_ids[0].s6id_list, idlist, sizeof(scope6_ids[0].s6id_list)); + lck_mtx_unlock(scope6_mutex); return(0); } @@ -291,5 +458,100 @@ u_int32_t scope6_addr2default( struct in6_addr *addr) { - return(scope6_ids[0].s6id_list[in6_addrscope(addr)]); + u_int32_t id = 0; + int index = in6_addrscope(addr); + lck_mtx_lock(scope6_mutex); + id = scope6_ids[0].s6id_list[index]; + lck_mtx_unlock(scope6_mutex); + return (id); +} + +/* + * Determine the appropriate scope zone ID for in6 and ifp. If ret_id is + * non NULL, it is set to the zone ID. If the zone ID needs to be embedded + * in the in6_addr structure, in6 will be modified. + * + * ret_id - unnecessary? + */ +int +in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id) +{ + int scope; + u_int32_t zoneid = 0; + int index = ifp->if_index; + +#ifdef DIAGNOSTIC + if (scope6_ids == NULL) { /* should not happen */ + panic("in6_setscope: scope array is NULL"); + /* NOTREACHED */ + } +#endif + + /* + * special case: the loopback address can only belong to a loopback + * interface. + */ + if (IN6_IS_ADDR_LOOPBACK(in6)) { + if (!(ifp->if_flags & IFF_LOOPBACK)) { + return (EINVAL); + } else { + if (ret_id != NULL) + *ret_id = 0; /* there's no ambiguity */ + return (0); + } + } + + scope = in6_addrscope(in6); + +#define SID scope6_ids[index] + lck_mtx_lock(scope6_mutex); + switch (scope) { + case IPV6_ADDR_SCOPE_INTFACELOCAL: /* should be interface index */ + zoneid = SID.s6id_list[IPV6_ADDR_SCOPE_INTFACELOCAL]; + break; + + case IPV6_ADDR_SCOPE_LINKLOCAL: + zoneid = SID.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]; + break; + + case IPV6_ADDR_SCOPE_SITELOCAL: + zoneid = SID.s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]; + break; + + case IPV6_ADDR_SCOPE_ORGLOCAL: + zoneid = SID.s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]; + break; +#undef SID + default: + zoneid = 0; /* XXX: treat as global. */ + break; + } + lck_mtx_unlock(scope6_mutex); + + if (ret_id != NULL) + *ret_id = zoneid; + + if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) + in6->s6_addr16[1] = htons(zoneid & 0xffff); /* XXX */ + + return (0); +} + +/* + * Just clear the embedded scope identifier. Return 0 if the original address + * is intact; return non 0 if the address is modified. + */ +int +in6_clearscope(struct in6_addr *in6) +{ + int modified = 0; + + if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) { + if (in6->s6_addr16[1] != 0) + modified = 1; + in6->s6_addr16[1] = 0; + } + + return (modified); } +