xnu-6153.11.26.tar.gz

[apple/xnu.git] / bsd / netinet / in_var.h

diff --git a/bsd/netinet/in_var.h b/bsd/netinet/in_var.h
index f31214281d4cfba844468e33ce5866d563f42f00..454a58288430771c804b4280de749999f13a63b4 100644 (file)
--- a/bsd/netinet/in_var.h
+++ b/bsd/netinet/in_var.h
@@ -1,31 +1,29 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2019 Apple Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_OSREFERENCE_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.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  *
  *

- * Please obtain a copy of the License at 
- * http://www.opensource.apple.com/apsl/ and read it before using this 
- * file.
+ * 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.

  *
  *

- * 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 
+ * 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.
  *
  * limitations under the License.
  *

- * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /*
  * Copyright (c) 1985, 1986, 1993
  */
 /*
  * Copyright (c) 1985, 1986, 1993


@@ -60,7 +58,6 @@
  * SUCH DAMAGE.
  *
  *     @(#)in_var.h    8.2 (Berkeley) 1/9/95
  * SUCH DAMAGE.
  *
  *     @(#)in_var.h    8.2 (Berkeley) 1/9/95

- * $FreeBSD: src/sys/netinet/in_var.h,v 1.33.2.2 2001/07/17 10:50:01 ru Exp $

  */
 
 #ifndef _NETINET_IN_VAR_H_
  */
 
 #ifndef _NETINET_IN_VAR_H_


@@ -68,11 +65,11 @@
 #include <sys/appleapiopts.h>
 
 #include <sys/queue.h>
 #include <sys/appleapiopts.h>
 
 #include <sys/queue.h>

-#ifdef __APPLE__

 #include <sys/kern_event.h>
 #include <sys/kern_event.h>

-#endif
+#include <net/net_kev.h>

 
 

-#ifdef PRIVATE
+#ifdef BSD_KERNEL_PRIVATE
+#include <net/route.h>

 
 /*
  * Interface address, Internet version.  One of these structures
 
 /*
  * Interface address, Internet version.  One of these structures


@@ -81,71 +78,96 @@
  * of the structure and is assumed to be first.
  */
 struct in_ifaddr {
  * of the structure and is assumed to be first.
  */
 struct in_ifaddr {

-       struct  ifaddr ia_ifa;          /* protocol-independent info */
-#define        ia_ifp          ia_ifa.ifa_ifp
-#define ia_flags       ia_ifa.ifa_flags
-                                       /* ia_{,sub}net{,mask} in host order */
-       u_long  ia_net;                 /* network number of interface */
-       u_long  ia_netmask;             /* mask of net part */
-       u_long  ia_subnet;              /* subnet number, including net */
-       u_long  ia_subnetmask;          /* mask of subnet part */
-       struct  in_addr ia_netbroadcast; /* to recognize net broadcasts */
-       TAILQ_ENTRY(in_ifaddr) ia_link; /* tailq macro glue */
-       struct  sockaddr_in ia_addr;    /* reserve space for interface name */
-       struct  sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
-#define        ia_broadaddr    ia_dstaddr
-       struct  sockaddr_in ia_sockmask; /* reserve space for general netmask */
+       struct ifaddr ia_ifa;           /* protocol-independent info */
+#define ia_ifp          ia_ifa.ifa_ifp
+#define ia_flags        ia_ifa.ifa_flags
+       /* ia_{,sub}net{,mask} in host order */
+       u_int32_t ia_net;               /* network number of interface */
+       u_int32_t ia_netmask;           /* mask of net part */
+       u_int32_t ia_subnet;            /* subnet number, including net */
+       u_int32_t ia_subnetmask;        /* mask of subnet part */
+       struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
+       TAILQ_ENTRY(in_ifaddr) ia_link; /* tailq macro glue */
+       struct sockaddr_in ia_addr;     /* reserve space for interface name */
+       struct sockaddr_in ia_dstaddr;  /* reserve space for broadcast addr */
+#define ia_broadaddr    ia_dstaddr
+       struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
+       TAILQ_ENTRY(in_ifaddr) ia_hash; /* hash bucket entry */

 };
 };

-#endif /* PRIVATE */

 
 

-struct in_aliasreq {
-       char    ifra_name[IFNAMSIZ];            /* if name, e.g. "en0" */
-       struct  sockaddr_in ifra_addr;
-       struct  sockaddr_in ifra_broadaddr;
-#define ifra_dstaddr ifra_broadaddr
-       struct  sockaddr_in ifra_mask;
-#ifdef __APPLE__
-        u_long              dlt;
-#endif
+#define ifatoia(ifa)    ((struct in_ifaddr *)(void *)(ifa))
+#endif /* BSD_KERNEL_PRIVATE */
+
+struct in_aliasreq {
+       char ifra_name[IFNAMSIZ];       /* if name, e.g. "en0" */
+       struct sockaddr_in ifra_addr;
+       struct sockaddr_in ifra_broadaddr;
+#define ifra_dstaddr    ifra_broadaddr
+       struct sockaddr_in ifra_mask;

 };
 
 /*
 };
 
 /*

- * Event data, internet style.
+ * Event data, inet style.

  */
 struct kev_in_data {
  */
 struct kev_in_data {

-       struct net_event_data   link_data;
-       struct in_addr  ia_addr;
-       u_long  ia_net;                 /* network number of interface */
-       u_long  ia_netmask;             /* mask of net part */
-       u_long  ia_subnet;              /* subnet number, including net */
-       u_long  ia_subnetmask;          /* mask of subnet part */
-       struct  in_addr ia_netbroadcast; /* to recognize net broadcasts */
-       struct  in_addr ia_dstaddr;
+       struct net_event_data link_data;
+       struct in_addr ia_addr;         /* interface address */
+       u_int32_t ia_net;               /* network number of interface */
+       u_int32_t ia_netmask;           /* mask of net part */
+       u_int32_t ia_subnet;            /* subnet number, including net */
+       u_int32_t ia_subnetmask;        /* mask of subnet part */
+       struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
+       struct in_addr ia_dstaddr;

 };
 
 struct kev_in_collision {
 };
 
 struct kev_in_collision {

-       struct  net_event_data  link_data;      /* link colliding arp was received on */
-       struct  in_addr ia_ipaddr;      /* IP address we and another node are using */
-       u_char  hw_len; /* length of hardware address */
-       u_char  hw_addr[0];     /* variable length hardware address */
+       struct net_event_data link_data; /* link where ARP was received on */
+       struct in_addr ia_ipaddr;       /* conflicting IP address */
+       u_char hw_len;                  /* length of hardware address */
+       u_char hw_addr[0];              /* variable length hardware address */
+};
+
+struct kev_in_arpfailure {
+       struct net_event_data link_data; /* link where ARP is being sent */

 };
 
 };
 

+struct kev_in_arpalive {
+       struct net_event_data link_data; /* link where ARP was received */
+};

 
 

+#ifdef PRIVATE

 /*
 /*

- * Define inet event subclass and specific inet events.
+ * Common structure for KEV_SOCKET_SUBCLASS
+ * Have to place here to avoid declaration dependencies.

  */
  */

+struct kev_socket_event_data {
+       union sockaddr_in_4_6 kev_sockname;
+       union sockaddr_in_4_6 kev_peername;
+};

 
 

-#define KEV_INET_SUBCLASS 1
+struct kev_socket_closed {
+       struct kev_socket_event_data ev_data;
+};
+#endif /* PRIVATE */

 
 

-#define KEV_INET_NEW_ADDR     1
-#define KEV_INET_CHANGED_ADDR 2
-#define KEV_INET_ADDR_DELETED 3
-#define KEV_INET_SIFDSTADDR   4
-#define KEV_INET_SIFBRDADDR   5
-#define KEV_INET_SIFNETMASK   6
-#define KEV_INET_ARPCOLLISION 7        /* use kev_in_collision */
+#ifdef __APPLE_API_PRIVATE
+struct kev_in_portinuse {
+       u_int16_t port;         /* conflicting port number in host order */
+       u_int32_t req_pid;      /* PID port requestor */
+       u_int32_t reserved[2];
+};
+#endif /* __APPLE_API_PRIVATE */

 
 

-#ifdef KERNEL_PRIVATE
+#ifdef BSD_KERNEL_PRIVATE
+extern void socket_post_kev_msg(uint32_t, struct kev_socket_event_data *,
+    uint32_t);
+extern void socket_post_kev_msg_closed(struct socket *);
+
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/if_llatbl.h>
+#include <kern/locks.h>
+#include <sys/tree.h>

 /*
  * Given a pointer to an in_ifaddr (ifaddr),
  * return a pointer to the addr as a sockaddr_in.
 /*
  * Given a pointer to an in_ifaddr (ifaddr),
  * return a pointer to the addr as a sockaddr_in.


@@ -156,46 +178,57 @@ struct kev_in_collision {
 #define IN_LNAOF(in, ifa) \
        ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
 
 #define IN_LNAOF(in, ifa) \
        ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
 

-extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
-extern struct  ifqueue ipintrq;                /* ip packet input queue */
-extern struct  in_addr zeroin_addr;
-extern u_char  inetctlerrmap[];
-extern lck_mtx_t *rt_mtx;
+/*
+ * Hash table for IPv4 addresses.
+ */
+extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
+extern TAILQ_HEAD(in_ifaddrhashhead, in_ifaddr) * in_ifaddrhashtbl;
+extern lck_rw_t *in_ifaddr_rwlock;
+
+#define INADDR_HASH(x)  (&in_ifaddrhashtbl[inaddr_hashval(x)])
+
+extern  u_char  inetctlerrmap[];

 
 /*
  * Macro for finding the interface (ifnet structure) corresponding to one
  * of our IP addresses.
  */
 
 /*
  * Macro for finding the interface (ifnet structure) corresponding to one
  * of our IP addresses.
  */

-#define INADDR_TO_IFP(addr, ifp) \
-       /* struct in_addr addr; */ \
-       /* struct ifnet *ifp; */ \
-{ \
-       struct in_ifaddr *ia; \
-\
-       lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_NOTOWNED); \
-       lck_mtx_lock(rt_mtx); \
-       TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) \
-               if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
-                       break; \
-       (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
-       lck_mtx_unlock(rt_mtx); \
+#define INADDR_TO_IFP(addr, ifp)                                        \
+       /* struct in_addr addr; */                                      \
+       /* struct ifnet *ifp; */                                        \
+{                                                                       \
+       struct in_ifaddr *ia;                                           \
+                                                                        \
+       lck_rw_lock_shared(in_ifaddr_rwlock);                           \
+       TAILQ_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) {        \
+               IFA_LOCK_SPIN(&ia->ia_ifa);                             \
+               if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) {     \
+                       IFA_UNLOCK(&ia->ia_ifa);                        \
+                       break;                                          \
+               }                                                       \
+               IFA_UNLOCK(&ia->ia_ifa);                                \
+       }                                                               \
+       (ifp) = (ia == NULL) ? NULL : ia->ia_ifp;                       \
+       lck_rw_done(in_ifaddr_rwlock);                                  \

 }
 
 /*
  * Macro for finding the internet address structure (in_ifaddr) corresponding
 }
 
 /*
  * Macro for finding the internet address structure (in_ifaddr) corresponding

- * to a given interface (ifnet structure).
+ * to a given interface (ifnet structure).  Caller is responsible for freeing
+ * the reference.

  */
  */

-#define IFP_TO_IA(ifp, ia) \
-       /* struct ifnet *ifp; */ \
-       /* struct in_ifaddr *ia; */ \
-{ \
-       lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_NOTOWNED); \
-       lck_mtx_lock(rt_mtx); \
-       for ((ia) = TAILQ_FIRST(&in_ifaddrhead); \
-           (ia) != NULL && (ia)->ia_ifp != (ifp); \
-           (ia) = TAILQ_NEXT((ia), ia_link)) \
-               continue; \
-       lck_mtx_unlock(rt_mtx); \
+#define IFP_TO_IA(ifp, ia)                                              \
+       /* struct ifnet *ifp; */                                        \
+       /* struct in_ifaddr *ia; */                                     \
+{                                                                       \
+       lck_rw_lock_shared(in_ifaddr_rwlock);                           \
+       for ((ia) = TAILQ_FIRST(&in_ifaddrhead);                        \
+           (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
+           (ia) = TAILQ_NEXT((ia), ia_link))                           \
+               continue;                                               \
+       if ((ia) != NULL)                                               \
+               IFA_ADDREF(&(ia)->ia_ifa);                              \
+       lck_rw_done(in_ifaddr_rwlock);                                  \

 }
 
 /*
 }
 
 /*


@@ -203,31 +236,155 @@ extern   lck_mtx_t *rt_mtx;
  * to change that - as it might break a number of things
  */
 
  * to change that - as it might break a number of things
  */
 

+/*
+ * Legacy IPv4 IGMP per-link structure.
+ */

 struct router_info {
        struct ifnet *rti_ifp;
        int    rti_type; /* type of router which is querier on this interface */
        int    rti_time; /* # of slow timeouts since last old query */
 struct router_info {
        struct ifnet *rti_ifp;
        int    rti_type; /* type of router which is querier on this interface */
        int    rti_time; /* # of slow timeouts since last old query */

-       struct router_info *rti_next;
+       SLIST_ENTRY(router_info) rti_list;
+};
+
+/*
+ * IPv4 multicast IGMP-layer source entry.
+ */
+struct ip_msource {
+       RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
+       in_addr_t               ims_haddr;      /* host byte order */
+       struct ims_st {
+               uint16_t        ex;             /* # of exclusive members */
+               uint16_t        in;             /* # of inclusive members */
+       }                       ims_st[2];      /* state at t0, t1 */
+       uint8_t                 ims_stp;        /* pending query */
+};
+
+/*
+ * IPv4 multicast PCB-layer source entry.
+ */
+struct in_msource {
+       RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
+       in_addr_t               ims_haddr;      /* host byte order */
+       uint8_t                 imsl_st[2];     /* state before/at commit */
+};
+
+RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
+
+RB_PROTOTYPE_SC_PREV(__private_extern__, ip_msource_tree, ip_msource,
+    ims_link, ip_msource_cmp);
+
+/*
+ * IPv4 multicast PCB-layer group filter descriptor.
+ */
+struct in_mfilter {
+       struct ip_msource_tree  imf_sources; /* source list for (S,G) */
+       u_long                  imf_nsrc;    /* # of source entries */
+       uint8_t                 imf_st[2];   /* state before/at commit */

 };
 
 };
 

+struct igmp_ifinfo;
+

 /*
 /*

- * Internet multicast address structure.  There is one of these for each IP
- * multicast group to which this host belongs on a given network interface.
- * For every entry on the interface's if_multiaddrs list which represents
- * an IP multicast group, there is one of these structures.  They are also
- * kept on a system-wide list to make it easier to keep our legacy IGMP code
- * compatible with the rest of the world (see IN_FIRST_MULTI et al, below).
+ * IPv4 group descriptor.
+ *
+ * For every entry on an ifnet's if_multiaddrs list which represents
+ * an IP multicast group, there is one of these structures.
+ *
+ * If any source filters are present, then a node will exist in the RB-tree
+ * to permit fast lookup by source whenever an operation takes place.
+ * This permits pre-order traversal when we issue reports.
+ * Source filter trees are kept separately from the socket layer to
+ * greatly simplify locking.
+ *
+ * When IGMPv3 is active, inm_timer is the response to group query timer.
+ * The state-change timer inm_sctimer is separate; whenever state changes
+ * for the group the state change record is generated and transmitted,
+ * and kept if retransmissions are necessary.
+ *
+ * The request count here is a count of requests for this address, not a
+ * count of pointers to this structure.
+ *
+ * FUTURE: inm_link is now only used when groups are being purged
+ * on a detaching ifnet.  It could be demoted to a SLIST_ENTRY.

  */
 struct in_multi {
  */
 struct in_multi {

-       LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
-       struct  in_addr inm_addr;       /* IP multicast address, convenience */
-       struct  ifnet *inm_ifp;         /* back pointer to ifnet */
-       struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
-       u_int   inm_timer;              /* IGMP membership report timer */
-       u_int   inm_state;              /*  state of the membership */
-       struct  router_info *inm_rti;   /* router info*/
+       decl_lck_mtx_data(, inm_lock);
+       u_int32_t inm_refcount;         /* reference count */
+       u_int32_t inm_reqcnt;           /* request count for this address */
+       u_int32_t inm_debug;            /* see ifa_debug flags */
+       LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
+       struct  in_addr inm_addr;       /* IP multicast address, convenience */
+       struct  ifnet *inm_ifp;         /* back pointer to ifnet */
+       struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
+       u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer  */
+       u_int   inm_state;              /*  state of the membership */
+       void *inm_rti;                  /* unused, legacy field */
+
+       /* New fields for IGMPv3 follow. */
+       struct igmp_ifinfo      *inm_igi;       /* IGMP info */
+       SLIST_ENTRY(in_multi)    inm_dtle;      /* detached waiting for rele */
+       SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
+       u_int32_t                inm_nrelecnt;  /* deferred release count */
+       struct ip_msource_tree   inm_srcs;      /* tree of sources */
+       u_long                   inm_nsrc;      /* # of tree entries */
+
+       struct ifqueue           inm_scq;       /* queue of pending
+                                                * state-change packets */
+       struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
+       uint16_t                 inm_sctimer;   /* state-change timer */
+       uint16_t                 inm_scrv;      /* state-change rexmit count */
+
+       /*
+        * SSM state counters which track state at T0 (the time the last
+        * state-change report's RV timer went to zero) and T1
+        * (time of pending report, i.e. now).
+        * Used for computing IGMPv3 state-change reports. Several refcounts
+        * are maintained here to optimize for common use-cases.
+        */
+       struct inm_st {
+               uint16_t        iss_fmode;      /* IGMP filter mode */
+               uint16_t        iss_asm;        /* # of ASM listeners */
+               uint16_t        iss_ex;         /* # of exclusive members */
+               uint16_t        iss_in;         /* # of inclusive members */
+               uint16_t        iss_rec;        /* # of recorded sources */
+       }                       inm_st[2];      /* state at t0, t1 */
+
+       void (*inm_trace)               /* callback fn for tracing refs */
+       (struct in_multi *, int);

 };
 
 };
 

+#define INM_LOCK_ASSERT_HELD(_inm)                                      \
+       LCK_MTX_ASSERT(&(_inm)->inm_lock, LCK_MTX_ASSERT_OWNED)
+
+#define INM_LOCK_ASSERT_NOTHELD(_inm)                                   \
+       LCK_MTX_ASSERT(&(_inm)->inm_lock, LCK_MTX_ASSERT_NOTOWNED)
+
+#define INM_LOCK(_inm)                                                  \
+       lck_mtx_lock(&(_inm)->inm_lock)
+
+#define INM_LOCK_SPIN(_inm)                                             \
+       lck_mtx_lock_spin(&(_inm)->inm_lock)
+
+#define INM_CONVERT_LOCK(_inm) do {                                     \
+       INM_LOCK_ASSERT_HELD(_inm);                                     \
+       lck_mtx_convert_spin(&(_inm)->inm_lock);                        \
+} while (0)
+
+#define INM_UNLOCK(_inm)                                                \
+       lck_mtx_unlock(&(_inm)->inm_lock)
+
+#define INM_ADDREF(_inm)                                                \
+       inm_addref(_inm, 0)
+
+#define INM_ADDREF_LOCKED(_inm)                                         \
+       inm_addref(_inm, 1)
+
+#define INM_REMREF(_inm)                                                \
+       inm_remref(_inm, 0)
+
+#define INM_REMREF_LOCKED(_inm)                                         \
+       inm_remref(_inm, 1)
+

 #ifdef SYSCTL_DECL
 SYSCTL_DECL(_net_inet_ip);
 SYSCTL_DECL(_net_inet_raw);
 #ifdef SYSCTL_DECL
 SYSCTL_DECL(_net_inet_ip);
 SYSCTL_DECL(_net_inet_raw);


@@ -246,22 +403,36 @@ struct in_multistep {
 /*
  * Macro for looking up the in_multi record for a given IP multicast address
  * on a given interface.  If no matching record is found, "inm" is set null.
 /*
  * Macro for looking up the in_multi record for a given IP multicast address
  * on a given interface.  If no matching record is found, "inm" is set null.

+ *
+ * We do this differently compared other BSD implementations; instead of
+ * walking the if_multiaddrs list at the interface and returning the
+ * ifma_protospec value of a matching entry, we search the global list
+ * of in_multi records and find it that way.  Otherwise either the two
+ * structures (in_multi, ifmultiaddr) need to be ref counted both ways,
+ * which will make things too complicated, or they need to reside in the
+ * same protected domain, which they aren't.
+ *
+ * Must be called with in_multihead_lock held.

  */
  */

-#define IN_LOOKUP_MULTI(addr, ifp, inm) \
-       /* struct in_addr addr; */ \
-       /* struct ifnet *ifp; */ \
-       /* struct in_multi *inm; */ \
-do { \
-       struct ifmultiaddr *ifma; \
-\
-       LIST_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { \
-               if (ifma->ifma_addr->sa_family == AF_INET \
-                   && ((struct sockaddr_in *)ifma->ifma_addr)->sin_addr.s_addr == \
-                   (addr).s_addr) \
-                       break; \
-       } \
-       (inm) = ifma ? ifma->ifma_protospec : 0; \
-} while(0)
+#define IN_LOOKUP_MULTI(addr, ifp, inm)                                 \
+       /* struct in_addr *addr; */                                     \
+       /* struct ifnet *ifp; */                                        \
+       /* struct in_multi *inm; */                                     \
+do {                                                                    \
+       struct in_multistep _step;                                      \
+       IN_FIRST_MULTI(_step, inm);                                     \
+       while ((inm) != NULL) {                                         \
+               INM_LOCK_SPIN(inm);                                     \
+               if ((inm)->inm_ifp == (ifp) &&                          \
+                   (inm)->inm_addr.s_addr == (addr)->s_addr) {         \
+                       INM_ADDREF_LOCKED(inm);                         \
+                       INM_UNLOCK(inm);                                \
+                       break;                                          \
+               }                                                       \
+               INM_UNLOCK(inm);                                        \
+               IN_NEXT_MULTI(_step, inm);                              \
+       }                                                               \
+} while (0)

 
 /*
  * Macro to step through all of the in_multi records, one at a time.
 
 /*
  * Macro to step through all of the in_multi records, one at a time.


@@ -269,39 +440,95 @@ do { \
  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
  * and get the first record.  Both macros return a NULL "inm" when there
  * are no remaining records.
  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
  * and get the first record.  Both macros return a NULL "inm" when there
  * are no remaining records.

+ *
+ * Must be called with in_multihead_lock held.

  */
  */

-#define IN_NEXT_MULTI(step, inm) \
-       /* struct in_multistep  step; */ \
-       /* struct in_multi *inm; */ \
-do { \
-       if (((inm) = (step).i_inm) != NULL) \
-               (step).i_inm = LIST_NEXT((step).i_inm, inm_link); \
-} while(0)
-
-#define IN_FIRST_MULTI(step, inm) \
-       /* struct in_multistep step; */ \
-       /* struct in_multi *inm; */ \
-do { \
-       (step).i_inm = LIST_FIRST(&in_multihead); \
-       IN_NEXT_MULTI((step), (inm)); \
-} while(0)
-
-struct route;
-struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
-void   in_delmulti(struct in_multi **);
-int    in_control(struct socket *, u_long, caddr_t, struct ifnet *,
-                       struct proc *);
-void   in_rtqdrain(void);
-void   ip_input(struct mbuf *);
-int    in_ifadown(struct ifaddr *ifa, int);
-void   in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
-int    ipflow_fastforward(struct mbuf *);
-void   ipflow_create(const struct route *, struct mbuf *);
-void   ipflow_slowtimo(void);
-
-#endif /* KERNEL_PRIVATE */
+#define IN_NEXT_MULTI(step, inm)                                        \
+       /* struct in_multistep  step; */                                \
+       /* struct in_multi *inm; */                                     \
+do {                                                                    \
+       in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
+       if (((inm) = (step).i_inm) != NULL)                             \
+               (step).i_inm = LIST_NEXT((step).i_inm, inm_link);       \
+} while (0)

 
 

+#define IN_FIRST_MULTI(step, inm)                                       \
+       /* struct in_multistep step; */                                 \
+       /* struct in_multi *inm; */                                     \
+do {                                                                    \
+       in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
+       (step).i_inm = LIST_FIRST(&in_multihead);                       \
+       IN_NEXT_MULTI((step), (inm));                                   \
+} while (0)
+
+extern lck_mtx_t *inet_domain_mutex;
+extern struct domain *inetdomain;
+
+struct ip_moptions;
+struct inpcb;
+
+/*
+ * Return values for imo_multi_filter().
+ */
+#define MCAST_PASS              0       /* Pass */
+#define MCAST_NOTGMEMBER        1       /* This host not a member of group */
+#define MCAST_NOTSMEMBER        2       /* This host excluded source */
+#define MCAST_MUTED             3       /* [deprecated] */
+
+/*
+ * Per-interface IPv4 structures.
+ */
+struct in_ifextra {
+       uint32_t                netsig_len;
+       u_int8_t                netsig[IFNET_SIGNATURELEN];
+       struct lltable          *ii_llt;        /* ARP state */
+};
+#define IN_IFEXTRA(_ifp)        ((struct in_ifextra *)(_ifp->if_inetdata))
+#define LLTABLE(ifp)            ((IN_IFEXTRA(ifp) == NULL) ? NULL : IN_IFEXTRA(ifp)->ii_llt)
+
+extern u_int32_t ipv4_ll_arp_aware;
+
+extern void in_ifaddr_init(void);
+extern int imo_multi_filter(const struct ip_moptions *,
+    const struct ifnet *, const struct sockaddr_in *,
+    const struct sockaddr_in *);
+extern int imo_clone(struct inpcb *, struct inpcb *);
+extern void inm_commit(struct in_multi *);
+extern void inm_clear_recorded(struct in_multi *);
+extern void inm_print(const struct in_multi *);
+extern int inm_record_source(struct in_multi *inm, const in_addr_t);
+extern void inm_release(struct in_multi *);
+extern void in_multi_init(void);
+extern struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
+extern void in_delmulti(struct in_multi *);
+extern int in_leavegroup(struct in_multi *, struct in_mfilter *);
+extern int in_multi_detach(struct in_multi *);
+extern void inm_addref(struct in_multi *, int);
+extern void inm_remref(struct in_multi *, int);
+extern void inm_purge(struct in_multi *);
+extern uint8_t ims_get_mode(const struct in_multi *,
+    const struct ip_msource *, uint8_t);
+extern int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
+    struct proc *);
+extern int in_inithead(void **, int);
+extern void in_rtqdrain(void);
+extern struct radix_node *in_validate(struct radix_node *);
+extern void ip_input(struct mbuf *);
+extern void ip_input_process_list(struct mbuf *);
+extern int in_ifadown(struct ifaddr *ifa, int);
+extern void in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
+extern u_int32_t inaddr_hashval(u_int32_t);
+extern void in_purgeaddrs(struct ifnet *);
+extern void gre_input(struct mbuf *, int);
+extern void imf_leave(struct in_mfilter *);
+extern void imf_purge(struct in_mfilter *);
+extern int inp_join_group(struct inpcb *, struct sockopt *);
+extern int inp_leave_group(struct inpcb *, struct sockopt *);
+extern void in_multihead_lock_exclusive(void);
+extern void in_multihead_lock_shared(void);
+extern void in_multihead_lock_assert(int);
+extern void in_multihead_lock_done(void);
+#endif /* BSD_KERNEL_PRIVATE */

 /* INET6 stuff */
 #include <netinet6/in6_var.h>
 /* INET6 stuff */
 #include <netinet6/in6_var.h>

-

 #endif /* _NETINET_IN_VAR_H_ */
 #endif /* _NETINET_IN_VAR_H_ */