X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/2d21ac55c334faf3a56e5634905ed6987fc787d4..060df5ea7c632b1ac8cc8aac1fb59758165c2084:/bsd/netinet6/ip6_forward.c?ds=sidebyside diff --git a/bsd/netinet6/ip6_forward.c b/bsd/netinet6/ip6_forward.c index 9f6f70b5f..202d8ccb1 100644 --- a/bsd/netinet6/ip6_forward.c +++ b/bsd/netinet6/ip6_forward.c @@ -1,3 +1,31 @@ +/* + * Copyright (c) 2008 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/ip6_forward.c,v 1.16 2002/10/16 02:25:05 sam Exp $ */ /* $KAME: ip6_forward.c,v 1.69 2001/05/17 03:48:30 itojun Exp $ */ @@ -73,6 +101,10 @@ extern lck_mtx_t *ip6_mutex; #include +#if PF +#include +#endif /* PF */ + /* * Forward a packet. If some error occurs return the sender * an icmp packet. Note we can't always generate a meaningful @@ -95,7 +127,7 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, struct rtentry *rt; int error, type = 0, code = 0; struct mbuf *mcopy = NULL; - struct ifnet *origifp; /* maybe unnecessary */ + struct ifnet *ifp, *origifp; /* maybe unnecessary */ #if IPSEC struct secpolicy *sp = NULL; #endif @@ -302,23 +334,46 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, skip_ipsec: #endif /* IPSEC */ + /* + * If "locked", ip6forward_rt points to the globally defined + * struct route cache which requires ip6_mutex, e.g. when this + * is called from ip6_input(). Else the caller is responsible + * for the struct route and its serialization (if needed), e.g. + * when this is called from ip6_rthdr0(). + */ + if (locked) + lck_mtx_assert(ip6_mutex, LCK_MTX_ASSERT_OWNED); dst = (struct sockaddr_in6 *)&ip6forward_rt->ro_dst; + if ((rt = ip6forward_rt->ro_rt) != NULL) { + RT_LOCK(rt); + /* Take an extra ref for ourselves */ + RT_ADDREF_LOCKED(rt); + } + if (!srcrt) { /* * ip6forward_rt->ro_dst.sin6_addr is equal to ip6->ip6_dst */ - if (ip6forward_rt->ro_rt == 0 || - (ip6forward_rt->ro_rt->rt_flags & RTF_UP) == 0) { - if (ip6forward_rt->ro_rt) { - rtfree(ip6forward_rt->ro_rt); - ip6forward_rt->ro_rt = 0; + if (rt == NULL || !(rt->rt_flags & RTF_UP) || + rt->generation_id != route_generation) { + if (rt != NULL) { + /* Release extra ref */ + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); + rtfree(rt); + ip6forward_rt->ro_rt = NULL; } /* this probably fails but give it a try again */ rtalloc_ign((struct route *)ip6forward_rt, - RTF_PRCLONING); + RTF_PRCLONING); + if ((rt = ip6forward_rt->ro_rt) != NULL) { + RT_LOCK(rt); + /* Take an extra ref for ourselves */ + RT_ADDREF_LOCKED(rt); + } } - if (ip6forward_rt->ro_rt == 0) { + if (rt == NULL) { ip6stat.ip6s_noroute++; in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute); if (mcopy) { @@ -332,34 +387,41 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, m_freem(m); return; } - } else if ((rt = ip6forward_rt->ro_rt) == 0 || - !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst->sin6_addr)) { - if (ip6forward_rt->ro_rt) { - rtfree(ip6forward_rt->ro_rt); - ip6forward_rt->ro_rt = 0; + RT_LOCK_ASSERT_HELD(rt); + } else if (rt == NULL || !(rt->rt_flags & RTF_UP) || + !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst->sin6_addr) || + rt->generation_id != route_generation) { + if (rt != NULL) { + /* Release extra ref */ + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); + rtfree(rt); + ip6forward_rt->ro_rt = NULL; } bzero(dst, sizeof(*dst)); dst->sin6_len = sizeof(struct sockaddr_in6); dst->sin6_family = AF_INET6; dst->sin6_addr = ip6->ip6_dst; - rtalloc_ign((struct route *)ip6forward_rt, RTF_PRCLONING); - if (ip6forward_rt->ro_rt == 0) { + rtalloc_ign((struct route *)ip6forward_rt, RTF_PRCLONING); + if ((rt = ip6forward_rt->ro_rt) == NULL) { ip6stat.ip6s_noroute++; in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute); if (mcopy) { if (locked) lck_mtx_unlock(ip6_mutex); icmp6_error(mcopy, ICMP6_DST_UNREACH, - ICMP6_DST_UNREACH_NOROUTE, 0); + ICMP6_DST_UNREACH_NOROUTE, 0); if (locked) lck_mtx_lock(ip6_mutex); } m_freem(m); return; } + RT_LOCK(rt); + /* Take an extra ref for ourselves */ + RT_ADDREF_LOCKED(rt); } - rt = ip6forward_rt->ro_rt; /* * Scope check: if a packet can't be delivered to its destination @@ -384,6 +446,9 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, ip6->ip6_nxt, if_name(m->m_pkthdr.rcvif), if_name(rt->rt_ifp)); } + /* Release extra ref */ + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); if (mcopy) { if (locked) lck_mtx_unlock(ip6_mutex); @@ -399,7 +464,7 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, if (m->m_pkthdr.len > rt->rt_ifp->if_mtu) { in6_ifstat_inc(rt->rt_ifp, ifs6_in_toobig); if (mcopy) { - u_long mtu; + uint32_t mtu; #if IPSEC struct secpolicy *sp2; int ipsecerror; @@ -431,11 +496,18 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, if (mtu < IPV6_MMTU) mtu = IPV6_MMTU; #endif + /* Release extra ref */ + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); if (locked) lck_mtx_unlock(ip6_mutex); icmp6_error(mcopy, ICMP6_PACKET_TOO_BIG, 0, mtu); if (locked) lck_mtx_lock(ip6_mutex); + } else { + /* Release extra ref */ + RT_REMREF_LOCKED(rt); + RT_UNLOCK(rt); } m_freem(m); return; @@ -466,6 +538,8 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, * type/code is based on suggestion by Rich Draves. * not sure if it is the best pick. */ + RT_REMREF_LOCKED(rt); /* Release extra ref */ + RT_UNLOCK(rt); if (locked) lck_mtx_unlock(ip6_mutex); icmp6_error(mcopy, ICMP6_DST_UNREACH, @@ -478,19 +552,27 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, type = ND_REDIRECT; } +#if IPFW2 /* * Check with the firewall... */ if (ip6_fw_enable && ip6_fw_chk_ptr) { u_short port = 0; + ifp = rt->rt_ifp; + /* Drop the lock but retain the extra ref */ + RT_UNLOCK(rt); /* If ipfw says divert, we have to just drop packet */ - if (ip6_fw_chk_ptr(&ip6, rt->rt_ifp, &port, &m)) { + if (ip6_fw_chk_ptr(&ip6, ifp, &port, &m)) { m_freem(m); goto freecopy; } - if (!m) + if (!m) { goto freecopy; + } + /* We still have the extra ref on rt */ + RT_LOCK(rt); } +#endif /* * Fake scoped addresses. Note that even link-local source or @@ -538,28 +620,61 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, in6_clearscope(&ip6->ip6_dst); #endif - error = nd6_output(rt->rt_ifp, origifp, m, dst, rt, locked); + ifp = rt->rt_ifp; + /* Drop the lock but retain the extra ref */ + RT_UNLOCK(rt); + +#if PF + if (locked) + lck_mtx_unlock(ip6_mutex); + + /* Invoke outbound packet filter */ + error = pf_af_hook(ifp, NULL, &m, AF_INET6, FALSE); + + if (locked) + lck_mtx_lock(ip6_mutex); + if (error) { - in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard); + if (m != NULL) { + panic("%s: unexpected packet %p\n", __func__, m); + /* NOTREACHED */ + } + /* Already freed by callee */ + goto senderr; + } + ip6 = mtod(m, struct ip6_hdr *); +#endif /* PF */ + + error = nd6_output(ifp, origifp, m, dst, rt, locked); + if (error) { + in6_ifstat_inc(ifp, ifs6_out_discard); ip6stat.ip6s_cantforward++; } else { ip6stat.ip6s_forward++; - in6_ifstat_inc(rt->rt_ifp, ifs6_out_forward); + in6_ifstat_inc(ifp, ifs6_out_forward); if (type) ip6stat.ip6s_redirectsent++; else { - if (mcopy) + if (mcopy) { goto freecopy; + } } } - if (mcopy == NULL) +#if PF +senderr: +#endif /* PF */ + if (mcopy == NULL) { + /* Release extra ref */ + RT_REMREF(rt); return; - + } switch (error) { case 0: #if 1 if (type == ND_REDIRECT) { icmp6_redirect_output(mcopy, rt); + /* Release extra ref */ + RT_REMREF(rt); return; } #endif @@ -587,9 +702,13 @@ ip6_forward(struct mbuf *m, struct route_in6 *ip6forward_rt, icmp6_error(mcopy, type, code, 0); if (locked) lck_mtx_lock(ip6_mutex); + /* Release extra ref */ + RT_REMREF(rt); return; freecopy: m_freem(mcopy); + /* Release extra ref */ + RT_REMREF(rt); return; }