This is xnu-8019. See this file in:
/*
 * Copyright (c) 2000-2021 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@
 */
/*
 * Copyright (c) 1982, 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.
 * 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.
 *
 *	@(#)ip_var.h	8.2 (Berkeley) 1/9/95
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2007 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.
 */

#ifndef _NETINET_IP_VAR_H_
#define _NETINET_IP_VAR_H_
#include <sys/appleapiopts.h>

#include <netinet/in.h>
#include <sys/types.h>

/*
 * Overlay for ip header used by other protocols (tcp, udp).
 */
struct ipovly {
	u_char  ih_x1[9];               /* (unused) */
	u_char  ih_pr;                  /* protocol */
	u_short ih_len;                 /* protocol length */
	struct  in_addr ih_src;         /* source internet address */
	struct  in_addr ih_dst;         /* destination internet address */
};

#ifdef BSD_KERNEL_PRIVATE
/*
 * Ip reassembly queue structure.  Each fragment
 * being reassembled is attached to one of these structures.
 * They are timed out after ipq_ttl drops to 0, and may also
 * be reclaimed if memory becomes tight.
 */
struct ipq {
	TAILQ_ENTRY(ipq) ipq_list;      /* to other reass headers */
	struct mbuf *ipq_frags;         /* to ip headers of fragments */
	u_char  ipq_ttl;                /* time for reass q to live */
	u_char  ipq_p;                  /* protocol of this fragment */
	u_short ipq_id;                 /* sequence id for reassembly */
	struct  in_addr ipq_src, ipq_dst;
	u_int32_t       ipq_nfrags;     /* # frags in this packet */
	uint32_t ipq_csum_flags;        /* checksum flags */
	uint32_t ipq_csum;              /* partial checksum value */
};

/*
 * Structure stored in mbuf in inpcb.ip_options
 * and passed to ip_output when ip options are in use.
 * The actual length of the options (including ipopt_dst)
 * is in m_len.
 */
#endif /* BSD_KERNEL_PRIVATE */
#define MAX_IPOPTLEN    40
#ifdef BSD_KERNEL_PRIVATE
struct ipoption {
	struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
	char    ipopt_list[MAX_IPOPTLEN];       /* options proper */
};

/*
 * Structure attached to inpcb.ip_moptions and
 * passed to ip_output when IP multicast options are in use.
 */
struct ip_moptions {
	decl_lck_mtx_data(, imo_lock);
	uint32_t imo_refcnt;            /* ref count */
	uint32_t imo_debug;             /* see ifa_debug flags */
	struct  ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
	u_char  imo_multicast_ttl;      /* TTL for outgoing multicasts */
	u_char  imo_multicast_loop;     /* 1 => hear sends if a member */
	u_short imo_num_memberships;    /* no. memberships this socket */
	u_short imo_max_memberships;    /* max memberships this socket */
	struct  in_multi **imo_membership;      /* group memberships */
	struct  in_mfilter *imo_mfilters;       /* source filters */
	u_int32_t imo_multicast_vif;    /* vif num outgoing multicasts */
	struct  in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
	void (*imo_trace)               /* callback fn for tracing refs */
	(struct ip_moptions *, int);
};

#define IMO_LOCK_ASSERT_HELD(_imo)                                      \
	LCK_MTX_ASSERT(&(_imo)->imo_lock, LCK_MTX_ASSERT_OWNED)

#define IMO_LOCK_ASSERT_NOTHELD(_imo)                                   \
	LCK_MTX_ASSERT(&(_imo)->imo_lock, LCK_MTX_ASSERT_NOTOWNED)

#define IMO_LOCK(_imo)                                                  \
	lck_mtx_lock(&(_imo)->imo_lock)

#define IMO_LOCK_SPIN(_imo)                                             \
	lck_mtx_lock_spin(&(_imo)->imo_lock)

#define IMO_CONVERT_LOCK(_imo) do {                                     \
	IMO_LOCK_ASSERT_HELD(_imo);                                     \
	lck_mtx_convert_spin(&(_imo)->imo_lock);                        \
} while (0)

#define IMO_UNLOCK(_imo)                                                \
	lck_mtx_unlock(&(_imo)->imo_lock)

#define IMO_ADDREF(_imo)                                                \
	imo_addref(_imo, 0)

#define IMO_ADDREF_LOCKED(_imo)                                         \
	imo_addref(_imo, 1)

#define IMO_REMREF(_imo)                                                \
	imo_remref(_imo)

/* mbuf tag for ip_forwarding info */
struct ip_fwd_tag {
	struct sockaddr_in *next_hop;   /* next_hop */
};
#endif /* BSD_KERNEL_PRIVATE */

struct  ipstat {
	u_int32_t ips_total;            /* total packets received */
	u_int32_t ips_badsum;           /* checksum bad */
	u_int32_t ips_tooshort;         /* packet too short */
	u_int32_t ips_toosmall;         /* not enough data */
	u_int32_t ips_badhlen;          /* ip header length < data size */
	u_int32_t ips_badlen;           /* ip length < ip header length */
	u_int32_t ips_fragments;        /* fragments received */
	u_int32_t ips_fragdropped;      /* frags dropped (dups, out of space) */
	u_int32_t ips_fragtimeout;      /* fragments timed out */
	u_int32_t ips_forward;          /* packets forwarded */
	u_int32_t ips_fastforward;      /* packets fast forwarded */
	u_int32_t ips_cantforward;      /* packets rcvd for unreachable dest */
	u_int32_t ips_redirectsent;     /* packets forwarded on same net */
	u_int32_t ips_noproto;          /* unknown or unsupported protocol */
	u_int32_t ips_delivered;        /* datagrams delivered to upper level */
	u_int32_t ips_localout;         /* total ip packets generated here */
	u_int32_t ips_odropped;         /* lost packets due to nobufs, etc. */
	u_int32_t ips_reassembled;      /* total packets reassembled ok */
	u_int32_t ips_fragmented;       /* datagrams successfully fragmented */
	u_int32_t ips_ofragments;       /* output fragments created */
	u_int32_t ips_cantfrag;         /* don't fragment flag was set, etc. */
	u_int32_t ips_badoptions;       /* error in option processing */
	u_int32_t ips_noroute;          /* packets discarded due to no route */
	u_int32_t ips_badvers;          /* ip version != 4 */
	u_int32_t ips_rawout;           /* total raw ip packets generated */
	u_int32_t ips_toolong;          /* ip length > max ip packet size */
	u_int32_t ips_notmember;        /* multicasts for unregistered grps */
	u_int32_t ips_nogif;            /* no match gif found */
	u_int32_t ips_badaddr;          /* invalid address on header */
	u_int32_t ips_pktdropcntrl;     /* pkt dropped, no mbufs for ctl data */
	u_int32_t ips_rcv_swcsum;       /* ip hdr swcksum (inbound), packets */
	u_int32_t ips_rcv_swcsum_bytes; /* ip hdr swcksum (inbound), bytes */
	u_int32_t ips_snd_swcsum;       /* ip hdr swcksum (outbound), packets */
	u_int32_t ips_snd_swcsum_bytes; /* ip hdr swcksum (outbound), bytes */
	u_int32_t ips_adj;              /* total packets trimmed/adjusted */
	u_int32_t ips_adj_hwcsum_clr;   /* hwcksum discarded during adj */
	u_int32_t ips_rxc_collisions;   /* rx chaining collisions */
	u_int32_t ips_rxc_chained;      /* rx chains */
	u_int32_t ips_rxc_notchain;     /* rx bypassed chaining */
	u_int32_t ips_rxc_chainsz_gt2;  /* rx chain size greater than 2 */
	u_int32_t ips_rxc_chainsz_gt4;  /* rx chain size greater than 4 */
	u_int32_t ips_rxc_notlist;      /* count of pkts through ip_input */
	u_int32_t ips_raw_sappend_fail; /* sock append failed */
	u_int32_t ips_necp_policy_drop; /* NECP policy related drop */
	u_int32_t ips_rcv_if_weak_match; /* packets whose receive interface that passed the Weak ES address check */
	u_int32_t ips_rcv_if_no_match;  /* packets whose receive interface did not pass the address check */
};

struct ip_linklocal_stat {
	u_int32_t       iplls_in_total;
	u_int32_t       iplls_in_badttl;
	u_int32_t       iplls_out_total;
	u_int32_t       iplls_out_badttl;
};

#ifdef KERNEL_PRIVATE
/* forward declarations for ip_output() */
struct ip_out_args;
struct ip_moptions;
#endif /* KERNEL_PRIVATE */

#ifdef BSD_KERNEL_PRIVATE
/* flags passed to ip_output as last parameter */
#define IP_FORWARDING   0x1             /* most of ip header exists */
#define IP_RAWOUTPUT    0x2             /* raw ip header exists */
#define IP_NOIPSEC      0x4             /* No IPsec processing */
#define IP_ROUTETOIF    SO_DONTROUTE    /* bypass routing tables (0x0010) */
#define IP_ALLOWBROADCAST SO_BROADCAST  /* can send broadcast pkts (0x0020) */
#define IP_OUTARGS      0x100           /* has ancillary output info */

#define IP_HDR_ALIGNED_P(_ip)   ((((uintptr_t)(_ip)) & ((uintptr_t)3)) == 0)
#define IP_OFF_IS_ATOMIC(_ip_off) ((_ip_off & (IP_DF | IP_MF | IP_OFFMASK)) == IP_DF)

/*
 * On platforms which require strict alignment (currently for anything but
 * i386 or x86_64), this macro checks whether the pointer to the IP header
 * is 32-bit aligned, and assert otherwise.
 */
#if defined(__i386__) || defined(__x86_64__)
#define IP_HDR_STRICT_ALIGNMENT_CHECK(_ip) do { } while (0)
#else /* !__i386__ && !__x86_64__ */
#define IP_HDR_STRICT_ALIGNMENT_CHECK(_ip) do {                         \
	if (!IP_HDR_ALIGNED_P(_ip)) {                                   \
	        panic_plain("\n%s: Unaligned IP header %p\n",           \
	            __func__, _ip);                                     \
	}                                                               \
} while (0)
#endif /* !__i386__ && !__x86_64__ */

struct ip;
struct inpcb;
struct route;
struct sockopt;

#include <kern/zalloc.h>
#include <net/flowadv.h>

/*
 * Extra information passed to ip_output when IP_OUTARGS is set.
 *
 * Upon returning an error to the caller, ip_output may indicate through
 * ipoa_flags any additional information regarding the error.
 */
struct ip_out_args {
	unsigned int    ipoa_boundif;   /* boundif interface index */
	struct flowadv  ipoa_flowadv;   /* flow advisory code */
	u_int32_t       ipoa_flags;     /* IPOAF output flags (see below) */
#define IPOAF_SELECT_SRCIF      0x00000001      /* src interface selection */
#define IPOAF_BOUND_IF          0x00000002      /* boundif value is valid */
#define IPOAF_BOUND_SRCADDR     0x00000004      /* bound to src address */
#define IPOAF_NO_CELLULAR       0x00000010      /* skip IFT_CELLULAR */
#define IPOAF_NO_EXPENSIVE      0x00000020      /* skip IFT_EXPENSIVE */
#define IPOAF_AWDL_UNRESTRICTED 0x00000040      /* can send over
	                                         *  AWDL_RESTRICTED */
#define IPOAF_QOSMARKING_ALLOWED        0x00000080      /* policy allows Fastlane DSCP marking */
#define IPOAF_NO_CONSTRAINED    0x00000400      /* skip IFXF_CONSTRAINED */
#define IPOAF_REDO_QOSMARKING_POLICY    0x00002000      /* Re-evaluate QOS marking policy */
#define IPOAF_R_IFDENIED 0x00004000      /* denied access to interface */
	int             ipoa_sotc;      /* traffic class for Fastlane DSCP mapping */
	int             ipoa_netsvctype; /* network service type */
	int32_t         qos_marking_gencount;
};

#define IPOAF_RET_MASK (IPOAF_R_IFDENIED)

extern struct ipstat ipstat;
extern int ip_use_randomid;
extern u_short ip_id;                   /* ip packet ctr, for ids */
extern int ip_defttl;                   /* default IP ttl */
extern int ipforwarding;                /* ip forwarding */
extern int rfc6864;
extern struct protosw *ip_protox[];
extern struct pr_usrreqs rip_usrreqs;

extern void ip_moptions_init(void);
extern struct ip_moptions *ip_allocmoptions(zalloc_flags_t);
extern int inp_getmoptions(struct inpcb *, struct sockopt *);
extern int inp_setmoptions(struct inpcb *, struct sockopt *);
extern void imo_addref(struct ip_moptions *, int);
extern void imo_remref(struct ip_moptions *);

struct protosw;
struct domain;

extern int ip_checkrouteralert(struct mbuf *);
extern int ip_ctloutput(struct socket *, struct sockopt *sopt);
extern void ip_drain(void);
extern void ip_init(struct protosw *, struct domain *);
extern int ip_output(struct mbuf *, struct mbuf *, struct route *, int,
    struct ip_moptions *, struct ip_out_args *);
extern int ip_output_list(struct mbuf *, int, struct mbuf *, struct route *,
    int, struct ip_moptions *, struct ip_out_args *);
extern void ip_output_checksum(struct ifnet *, struct mbuf *, int, int,
    uint32_t *);
extern struct in_ifaddr *ip_rtaddr(struct in_addr);
extern int ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
    struct mbuf *);
extern struct mbuf *ip_srcroute(void);
extern void  ip_stripoptions(struct mbuf *);
extern u_int16_t ip_randomid(uint64_t);
extern int ip_fragment(struct mbuf *, struct ifnet *, uint32_t, int);

extern void ip_setsrcifaddr_info(struct mbuf *, uint16_t, struct in_ifaddr *);
extern void ip_setdstifaddr_info(struct mbuf *, uint16_t, struct in_ifaddr *);
extern int ip_getsrcifaddr_info(struct mbuf *, uint32_t *, uint32_t *);
extern int ip_getdstifaddr_info(struct mbuf *, uint32_t *, uint32_t *);

extern int rip_ctloutput(struct socket *, struct sockopt *);
extern void rip_ctlinput(int, struct sockaddr *, void *, struct ifnet *);
extern void rip_init(struct protosw *, struct domain *);
extern void rip_input(struct mbuf *, int);
extern int rip_output(struct mbuf *, struct socket *, u_int32_t, struct mbuf *);
extern int rip_unlock(struct socket *, int, void *);
extern int rip_send(struct socket *, int, struct mbuf *, struct sockaddr *,
    struct mbuf *, struct proc *);

extern void tcp_in_cksum_stats(u_int32_t);
extern void tcp_out_cksum_stats(u_int32_t);

extern void udp_in_cksum_stats(u_int32_t);
extern void udp_out_cksum_stats(u_int32_t);

extern void tcp_in6_cksum_stats(u_int32_t);
extern void tcp_out6_cksum_stats(u_int32_t);

extern void udp_in6_cksum_stats(u_int32_t);
extern void udp_out6_cksum_stats(u_int32_t);
#endif /* BSD_KERNEL_PRIVATE */
#ifdef KERNEL_PRIVATE
/* for PPP/PPTP */
extern int ip_gre_output(struct mbuf *);
typedef struct mbuf *(*gre_input_func_t)(struct mbuf *, int, int);
extern int ip_gre_register_input(gre_input_func_t);
#endif /* KERNEL_PRIVATE */
#endif /* !_NETINET_IP_VAR_H_ */