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29 * @(#)ip_var.h 8.2 (Berkeley) 1/9/95
33 #ifndef _NETINET_IP_VAR_H_
34 #define _NETINET_IP_VAR_H_
36 #include <sys/queue.h>
39 * Overlay for ip header used by other protocols (tcp, udp).
42 u_char ih_x1[9]; /* (unused) */
43 u_char ih_pr; /* protocol */
44 u_short ih_len; /* protocol length */
45 struct in_addr ih_src; /* source internet address */
46 struct in_addr ih_dst; /* destination internet address */
51 * Ip reassembly queue structure. Each fragment
52 * being reassembled is attached to one of these structures.
53 * They are timed out after ipq_ttl drops to 0, and may also
54 * be reclaimed if memory becomes tight.
57 TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */
58 u_char ipq_ttl; /* time for reass q to live */
59 u_char ipq_p; /* protocol of this fragment */
60 u_short ipq_id; /* sequence id for reassembly */
61 struct mbuf *ipq_frags; /* to ip headers of fragments */
62 struct in_addr ipq_src,ipq_dst;
63 u_char ipq_nfrags; /* # frags in this packet */
64 struct label *ipq_label; /* MAC label */
69 * Structure stored in mbuf in inpcb.ip_options
70 * and passed to ip_output when ip options are in use.
71 * The actual length of the options (including ipopt_dst)
74 #define MAX_IPOPTLEN 40
77 struct in_addr ipopt_dst; /* first-hop dst if source routed */
78 char ipopt_list[MAX_IPOPTLEN]; /* options proper */
82 * Structure attached to inpcb.ip_moptions and
83 * passed to ip_output when IP multicast options are in use.
86 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
87 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
88 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
89 u_char imo_multicast_loop; /* 1 => hear sends if a member */
90 u_short imo_num_memberships; /* no. memberships this socket */
91 struct in_multi *imo_membership[IP_MAX_MEMBERSHIPS];
92 u_long imo_multicast_vif; /* vif num outgoing multicasts */
96 u_long ips_total; /* total packets received */
97 u_long ips_badsum; /* checksum bad */
98 u_long ips_tooshort; /* packet too short */
99 u_long ips_toosmall; /* not enough data */
100 u_long ips_badhlen; /* ip header length < data size */
101 u_long ips_badlen; /* ip length < ip header length */
102 u_long ips_fragments; /* fragments received */
103 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
104 u_long ips_fragtimeout; /* fragments timed out */
105 u_long ips_forward; /* packets forwarded */
106 u_long ips_fastforward; /* packets fast forwarded */
107 u_long ips_cantforward; /* packets rcvd for unreachable dest */
108 u_long ips_redirectsent; /* packets forwarded on same net */
109 u_long ips_noproto; /* unknown or unsupported protocol */
110 u_long ips_delivered; /* datagrams delivered to upper level*/
111 u_long ips_localout; /* total ip packets generated here */
112 u_long ips_odropped; /* lost packets due to nobufs, etc. */
113 u_long ips_reassembled; /* total packets reassembled ok */
114 u_long ips_fragmented; /* datagrams successfully fragmented */
115 u_long ips_ofragments; /* output fragments created */
116 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
117 u_long ips_badoptions; /* error in option processing */
118 u_long ips_noroute; /* packets discarded due to no route */
119 u_long ips_badvers; /* ip version != 4 */
120 u_long ips_rawout; /* total raw ip packets generated */
121 u_long ips_toolong; /* ip length > max ip packet size */
122 u_long ips_notmember; /* multicasts for unregistered grps */
123 u_long ips_nogif; /* no match gif found */
124 u_long ips_badaddr; /* invalid address on header */
129 /* flags passed to ip_output as last parameter */
130 #define IP_FORWARDING 0x1 /* most of ip header exists */
131 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
132 #define IP_SENDONES 0x4 /* send all-ones broadcast */
133 #define IP_ROUTETOIF SO_DONTROUTE /* bypass routing tables */
134 #define IP_ALLOWBROADCAST SO_BROADCAST /* can send broadcast packets */
136 /* mbuf flag used by ip_fastfwd */
137 #define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */
139 #ifdef __NO_STRICT_ALIGNMENT
140 #define IP_HDR_ALIGNED_P(ip) 1
142 #define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
150 extern struct ipstat ipstat;
151 extern u_short ip_id; /* ip packet ctr, for ids */
152 extern int ip_defttl; /* default IP ttl */
153 extern int ipforwarding; /* ip forwarding */
155 extern int ipstealth; /* stealth forwarding */
157 extern u_char ip_protox[];
158 extern struct socket *ip_rsvpd; /* reservation protocol daemon */
159 extern struct socket *ip_mrouter; /* multicast routing daemon */
160 extern int (*legal_vif_num)(int);
161 extern u_long (*ip_mcast_src)(int);
163 extern struct pr_usrreqs rip_usrreqs;
165 int ip_ctloutput(struct socket *, struct sockopt *sopt);
167 void ip_fini(void *xtp);
168 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
169 u_long if_hwassist_flags, int sw_csum);
170 void ip_freemoptions(struct ip_moptions *);
171 void ip_forward(struct mbuf *m, int srcrt);
173 extern int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
174 struct ip_moptions *);
175 int ip_output(struct mbuf *,
176 struct mbuf *, struct route *, int, struct ip_moptions *,
178 int ipproto_register(u_char);
179 int ipproto_unregister(u_char);
181 ip_reass(struct mbuf *);
183 ip_rtaddr(struct in_addr);
184 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
186 void ip_slowtimo(void);
187 u_int16_t ip_randomid(void);
188 int rip_ctloutput(struct socket *, struct sockopt *);
189 void rip_ctlinput(int, struct sockaddr *, void *);
191 void rip_input(struct mbuf *, int);
192 int rip_output(struct mbuf *, struct socket *, u_long);
193 void ipip_input(struct mbuf *, int);
194 void rsvp_input(struct mbuf *, int);
195 int ip_rsvp_init(struct socket *);
196 int ip_rsvp_done(void);
197 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
198 extern void (*ip_rsvp_force_done)(struct socket *);
199 extern void (*rsvp_input_p)(struct mbuf *m, int off);
201 extern struct pfil_head inet_pfil_hook; /* packet filter hooks */
203 void in_delayed_cksum(struct mbuf *m);
205 static __inline uint16_t ip_newid(void);
206 extern int ip_do_randomid;
208 static __inline uint16_t
212 return ip_randomid();
214 return htons(ip_id++);
219 #endif /* !_NETINET_IP_VAR_H_ */