/* $NetBSD: ip_var.h,v 1.83 2007/12/25 18:33:47 perry Exp $ */ /* * 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. 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 */ #ifndef _NETINET_IP_VAR_H_ #define _NETINET_IP_VAR_H_ #include #include /* * Overlay for ip header used by other protocols (tcp, udp). */ struct ipovly { u_int8_t ih_x1[9]; /* (unused) */ u_int8_t ih_pr; /* protocol */ u_int16_t ih_len; /* protocol length */ struct in_addr ih_src; /* source internet address */ struct in_addr ih_dst; /* destination internet address */ } __packed; /* * Ip (reassembly or sequence) queue structures. * * XXX -- The following explains why the ipqe_m field is here, for TCP's use: * We want to avoid doing m_pullup on incoming packets but that * means avoiding dtom on the tcp reassembly code. That in turn means * keeping an mbuf pointer in the reassembly queue (since we might * have a cluster). As a quick hack, the source & destination * port numbers (which are no longer needed once we've located the * tcpcb) are overlayed with an mbuf pointer. */ TAILQ_HEAD(ipqehead, ipqent); struct ipqent { TAILQ_ENTRY(ipqent) ipqe_q; union { struct ip *_ip; struct tcpiphdr *_tcp; } _ipqe_u1; struct mbuf *ipqe_m; /* point to first mbuf */ struct mbuf *ipre_mlast; /* point to last mbuf */ u_int8_t ipqe_mff; /* for IP fragmentation */ /* * The following are used in TCP reassembly */ TAILQ_ENTRY(ipqent) ipqe_timeq; u_int32_t ipqe_seq; u_int32_t ipqe_len; u_int32_t ipqe_flags; }; #define ipqe_ip _ipqe_u1._ip #define ipqe_tcp _ipqe_u1._tcp /* * 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 { LIST_ENTRY(ipq) ipq_q; /* to other reass headers */ u_int8_t ipq_ttl; /* time for reass q to live */ u_int8_t ipq_p; /* protocol of this fragment */ u_int16_t ipq_id; /* sequence id for reassembly */ struct ipqehead ipq_fragq; /* to ip fragment queue */ struct in_addr ipq_src, ipq_dst; u_int16_t ipq_nfrags; /* frags in this queue entry */ u_int8_t ipq_tos; /* TOS of this fragment */ }; /* * 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. */ #define MAX_IPOPTLEN 40 struct ipoption { struct in_addr ipopt_dst; /* first-hop dst if source routed */ int8_t 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 { struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */ struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */ u_int8_t imo_multicast_ttl; /* TTL for outgoing multicasts */ u_int8_t imo_multicast_loop; /* 1 => hear sends if a member */ u_int16_t imo_num_memberships; /* no. memberships this socket */ struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS]; }; struct ipstat { u_quad_t ips_total; /* total packets received */ u_quad_t ips_badsum; /* checksum bad */ u_quad_t ips_tooshort; /* packet too short */ u_quad_t ips_toosmall; /* not enough data */ u_quad_t ips_badhlen; /* ip header length < data size */ u_quad_t ips_badlen; /* ip length < ip header length */ u_quad_t ips_fragments; /* fragments received */ u_quad_t ips_fragdropped; /* frags dropped (dups, out of space) */ u_quad_t ips_fragtimeout; /* fragments timed out */ u_quad_t ips_forward; /* packets forwarded */ u_quad_t ips_fastforward; /* packets fast forwarded */ u_quad_t ips_cantforward; /* packets rcvd for unreachable dest */ u_quad_t ips_redirectsent; /* packets forwarded on same net */ u_quad_t ips_noproto; /* unknown or unsupported protocol */ u_quad_t ips_delivered; /* datagrams delivered to upper level*/ u_quad_t ips_localout; /* total ip packets generated here */ u_quad_t ips_odropped; /* lost packets due to nobufs, etc. */ u_quad_t ips_reassembled; /* total packets reassembled ok */ u_quad_t ips_fragmented; /* datagrams successfully fragmented */ u_quad_t ips_ofragments; /* output fragments created */ u_quad_t ips_cantfrag; /* don't fragment flag was set, etc. */ u_quad_t ips_badoptions; /* error in option processing */ u_quad_t ips_noroute; /* packets discarded due to no route */ u_quad_t ips_badvers; /* ip version != 4 */ u_quad_t ips_rawout; /* total raw ip packets generated */ u_quad_t ips_badfrags; /* malformed fragments (bad length) */ u_quad_t ips_rcvmemdrop; /* frags dropped for lack of memory */ u_quad_t ips_toolong; /* ip length > max ip packet size */ u_quad_t ips_nogif; /* no match gif found */ u_quad_t ips_badaddr; /* invalid address on header */ }; #define IPFLOW_HASHBITS 6 /* should not be a multiple of 8 */ struct ipflow { LIST_ENTRY(ipflow) ipf_list; /* next in active list */ LIST_ENTRY(ipflow) ipf_hash; /* next ipflow in bucket */ struct in_addr ipf_dst; /* destination address */ struct in_addr ipf_src; /* source address */ u_int8_t ipf_tos; /* type-of-service */ struct route ipf_ro; /* associated route entry */ u_long ipf_uses; /* number of uses in this period */ u_long ipf_last_uses; /* number of uses in last period */ u_long ipf_dropped; /* ENOBUFS returned by if_output */ u_long ipf_errors; /* other errors returned by if_output */ u_int ipf_timer; /* lifetime timer */ time_t ipf_start; /* creation time */ }; #ifdef _KERNEL #ifdef _KERNEL_OPT #include "opt_gateway.h" #include "opt_mbuftrace.h" #endif /* 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_RETURNMTU 0x4 /* pass back mtu on EMSGSIZE */ #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */ #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */ #define IP_MTUDISC 0x0400 /* Path MTU Discovery; set DF */ #ifdef __NO_STRICT_ALIGNMENT #define IP_HDR_ALIGNED_P(ip) 1 #else #define IP_HDR_ALIGNED_P(ip) ((((vaddr_t) (ip)) & 3) == 0) #endif extern struct domain inetdomain; extern struct ipstat ipstat; /* ip statistics */ extern LIST_HEAD(ipqhead, ipq) ipq[]; /* ip reass. queue */ extern int ip_defttl; /* default IP ttl */ extern int ipforwarding; /* ip forwarding */ extern int ip_mtudisc; /* mtu discovery */ extern int ip_mtudisc_timeout; /* seconds to timeout mtu discovery */ extern int anonportmin; /* minimum ephemeral port */ extern int anonportmax; /* maximum ephemeral port */ extern int lowportmin; /* minimum reserved port */ extern int lowportmax; /* maximum reserved port */ extern int ip_do_loopback_cksum; /* do IP checksum on loopback? */ extern struct rttimer_queue *ip_mtudisc_timeout_q; #ifdef MBUFTRACE extern struct mowner ip_rx_mowner; extern struct mowner ip_tx_mowner; #endif #ifdef GATEWAY extern int ip_maxflows; extern int ip_hashsize; #endif extern struct pool inmulti_pool; extern struct pool ipqent_pool; struct inpcb; int ip_ctloutput(int, struct socket *, int, int, struct mbuf **); int ip_dooptions(struct mbuf *); void ip_drain(void); void ip_forward(struct mbuf *, int); void ip_freef(struct ipq *); void ip_freemoptions(struct ip_moptions *); int ip_getmoptions(int, struct ip_moptions *, struct mbuf **); void ip_init(void); int ip_optcopy(struct ip *, struct ip *); u_int ip_optlen(struct inpcb *); int ip_output(struct mbuf *, ...); int ip_fragment(struct mbuf *, struct ifnet *, u_long); int ip_pcbopts(struct mbuf **, struct mbuf *); struct mbuf * ip_reass(struct ipqent *, struct ipq *, struct ipqhead *); struct in_ifaddr * ip_rtaddr(struct in_addr); void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *, struct mbuf *); int ip_setmoptions(int, struct ip_moptions **, struct mbuf *); void ip_slowtimo(void); struct mbuf * ip_srcroute(void); int ip_sysctl(int *, u_int, void *, size_t *, void *, size_t); void ipintr(void); void * rip_ctlinput(int, const struct sockaddr *, void *); int rip_ctloutput(int, struct socket *, int, int, struct mbuf **); void rip_init(void); void rip_input(struct mbuf *, ...); int rip_output(struct mbuf *, ...); int rip_usrreq(struct socket *, int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *); int ipflow_init(int); struct ipflow *ipflow_reap(int); void ipflow_create(const struct route *, struct mbuf *); void ipflow_slowtimo(void); int ipflow_invalidate_all(int); extern uint16_t ip_id; static __inline uint16_t ip_newid(void); u_int16_t ip_randomid(void); extern int ip_do_randomid; /* * ip_newid_range: "allocate" num contiguous ip_ids. * * => return the first id. */ static __inline uint16_t ip_newid_range(unsigned int num) { uint16_t id; if (ip_do_randomid) { /* XXX ignore num */ return ip_randomid(); } /* * never allow an ip_id of 0. (detect wrap) */ if ((uint16_t)(ip_id + num) < ip_id) ip_id = 1; id = htons(ip_id); ip_id += num; return id; } static __inline uint16_t ip_newid(void) { return ip_newid_range(1); } #endif /* _KERNEL */ #endif /* !_NETINET_IP_VAR_H_ */