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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 * Multicast source list entry.
85 TAILQ_ENTRY(in_msource) ims_next; /* next source */
86 struct sockaddr_storage ims_addr; /* address of this source */
90 * Multicast filter descriptor; there is one instance per group membership
91 * on a socket, allocated as an expandable vector hung off ip_moptions.
92 * struct in_multi contains separate IPv4-stack-wide state for IGMPv3.
95 uint16_t imf_fmode; /* filter mode for this socket/group */
96 uint16_t imf_nsources; /* # of sources for this socket/group */
97 TAILQ_HEAD(, in_msource) imf_sources; /* source list */
101 * Structure attached to inpcb.ip_moptions and
102 * passed to ip_output when IP multicast options are in use.
103 * This structure is lazy-allocated.
106 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
107 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
108 u_long imo_multicast_vif; /* vif num outgoing multicasts */
109 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
110 u_char imo_multicast_loop; /* 1 => hear sends if a member */
111 u_short imo_num_memberships; /* no. memberships this socket */
112 u_short imo_max_memberships; /* max memberships this socket */
113 struct in_multi **imo_membership; /* group memberships */
114 struct in_mfilter *imo_mfilters; /* source filters */
118 u_long ips_total; /* total packets received */
119 u_long ips_badsum; /* checksum bad */
120 u_long ips_tooshort; /* packet too short */
121 u_long ips_toosmall; /* not enough data */
122 u_long ips_badhlen; /* ip header length < data size */
123 u_long ips_badlen; /* ip length < ip header length */
124 u_long ips_fragments; /* fragments received */
125 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
126 u_long ips_fragtimeout; /* fragments timed out */
127 u_long ips_forward; /* packets forwarded */
128 u_long ips_fastforward; /* packets fast forwarded */
129 u_long ips_cantforward; /* packets rcvd for unreachable dest */
130 u_long ips_redirectsent; /* packets forwarded on same net */
131 u_long ips_noproto; /* unknown or unsupported protocol */
132 u_long ips_delivered; /* datagrams delivered to upper level*/
133 u_long ips_localout; /* total ip packets generated here */
134 u_long ips_odropped; /* lost packets due to nobufs, etc. */
135 u_long ips_reassembled; /* total packets reassembled ok */
136 u_long ips_fragmented; /* datagrams successfully fragmented */
137 u_long ips_ofragments; /* output fragments created */
138 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
139 u_long ips_badoptions; /* error in option processing */
140 u_long ips_noroute; /* packets discarded due to no route */
141 u_long ips_badvers; /* ip version != 4 */
142 u_long ips_rawout; /* total raw ip packets generated */
143 u_long ips_toolong; /* ip length > max ip packet size */
144 u_long ips_notmember; /* multicasts for unregistered grps */
145 u_long ips_nogif; /* no match gif found */
146 u_long ips_badaddr; /* invalid address on header */
151 /* flags passed to ip_output as last parameter */
152 #define IP_FORWARDING 0x1 /* most of ip header exists */
153 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
154 #define IP_SENDONES 0x4 /* send all-ones broadcast */
155 #define IP_SENDTOIF 0x8 /* send on specific ifnet */
156 #define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */
157 #define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */
160 * mbuf flag used by ip_fastfwd
162 #define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */
164 #ifdef __NO_STRICT_ALIGNMENT
165 #define IP_HDR_ALIGNED_P(ip) 1
167 #define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
175 extern struct ipstat ipstat;
176 extern u_short ip_id; /* ip packet ctr, for ids */
177 extern int ip_defttl; /* default IP ttl */
178 extern int ipforwarding; /* ip forwarding */
180 extern int ipstealth; /* stealth forwarding */
182 extern u_char ip_protox[];
183 extern struct socket *ip_rsvpd; /* reservation protocol daemon */
184 extern struct socket *ip_mrouter; /* multicast routing daemon */
185 extern int (*legal_vif_num)(int);
186 extern u_long (*ip_mcast_src)(int);
188 extern struct pr_usrreqs rip_usrreqs;
190 void inp_freemoptions(struct ip_moptions *);
191 int inp_getmoptions(struct inpcb *, struct sockopt *);
192 int inp_setmoptions(struct inpcb *, struct sockopt *);
194 int ip_ctloutput(struct socket *, struct sockopt *sopt);
196 void ip_fini(void *xtp);
197 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
198 u_long if_hwassist_flags, int sw_csum);
199 void ip_forward(struct mbuf *m, int srcrt);
202 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
203 struct ip_moptions *);
204 int ip_output(struct mbuf *,
205 struct mbuf *, struct route *, int, struct ip_moptions *,
207 int ipproto_register(u_char);
208 int ipproto_unregister(u_char);
210 ip_reass(struct mbuf *);
212 ip_rtaddr(struct in_addr, u_int fibnum);
213 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
215 void ip_slowtimo(void);
216 u_int16_t ip_randomid(void);
217 int rip_ctloutput(struct socket *, struct sockopt *);
218 void rip_ctlinput(int, struct sockaddr *, void *);
220 void rip_input(struct mbuf *, int);
221 int rip_output(struct mbuf *, struct socket *, u_long);
222 void ipip_input(struct mbuf *, int);
223 void rsvp_input(struct mbuf *, int);
224 int ip_rsvp_init(struct socket *);
225 int ip_rsvp_done(void);
226 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
227 extern void (*ip_rsvp_force_done)(struct socket *);
228 extern void (*rsvp_input_p)(struct mbuf *m, int off);
230 extern struct pfil_head inet_pfil_hook; /* packet filter hooks */
232 void in_delayed_cksum(struct mbuf *m);
234 static __inline uint16_t ip_newid(void);
235 extern int ip_do_randomid;
237 static __inline uint16_t
241 return ip_randomid();
243 return htons(ip_id++);
248 #endif /* !_NETINET_IP_VAR_H_ */