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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.
84 * This structure is lazy-allocated.
87 struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
88 struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
89 u_long imo_multicast_vif; /* vif num outgoing multicasts */
90 u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
91 u_char imo_multicast_loop; /* 1 => hear sends if a member */
92 u_short imo_num_memberships; /* no. memberships this socket */
93 u_short imo_max_memberships; /* max memberships this socket */
94 struct in_multi **imo_membership; /* group memberships */
95 struct in_mfilter *imo_mfilters; /* source filters */
99 u_long ips_total; /* total packets received */
100 u_long ips_badsum; /* checksum bad */
101 u_long ips_tooshort; /* packet too short */
102 u_long ips_toosmall; /* not enough data */
103 u_long ips_badhlen; /* ip header length < data size */
104 u_long ips_badlen; /* ip length < ip header length */
105 u_long ips_fragments; /* fragments received */
106 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
107 u_long ips_fragtimeout; /* fragments timed out */
108 u_long ips_forward; /* packets forwarded */
109 u_long ips_fastforward; /* packets fast forwarded */
110 u_long ips_cantforward; /* packets rcvd for unreachable dest */
111 u_long ips_redirectsent; /* packets forwarded on same net */
112 u_long ips_noproto; /* unknown or unsupported protocol */
113 u_long ips_delivered; /* datagrams delivered to upper level*/
114 u_long ips_localout; /* total ip packets generated here */
115 u_long ips_odropped; /* lost packets due to nobufs, etc. */
116 u_long ips_reassembled; /* total packets reassembled ok */
117 u_long ips_fragmented; /* datagrams successfully fragmented */
118 u_long ips_ofragments; /* output fragments created */
119 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
120 u_long ips_badoptions; /* error in option processing */
121 u_long ips_noroute; /* packets discarded due to no route */
122 u_long ips_badvers; /* ip version != 4 */
123 u_long ips_rawout; /* total raw ip packets generated */
124 u_long ips_toolong; /* ip length > max ip packet size */
125 u_long ips_notmember; /* multicasts for unregistered grps */
126 u_long ips_nogif; /* no match gif found */
127 u_long ips_badaddr; /* invalid address on header */
132 #include <net/vnet.h>
135 * In-kernel consumers can use these accessor macros directly to update
138 #define IPSTAT_ADD(name, val) V_ipstat.name += (val)
139 #define IPSTAT_SUB(name, val) V_ipstat.name -= (val)
140 #define IPSTAT_INC(name) IPSTAT_ADD(name, 1)
141 #define IPSTAT_DEC(name) IPSTAT_SUB(name, 1)
144 * Kernel module consumers must use this accessor macro.
146 void kmod_ipstat_inc(int statnum);
147 #define KMOD_IPSTAT_INC(name) \
148 kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(u_long))
149 void kmod_ipstat_dec(int statnum);
150 #define KMOD_IPSTAT_DEC(name) \
151 kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(u_long))
153 /* flags passed to ip_output as last parameter */
154 #define IP_FORWARDING 0x1 /* most of ip header exists */
155 #define IP_RAWOUTPUT 0x2 /* raw ip header exists */
156 #define IP_SENDONES 0x4 /* send all-ones broadcast */
157 #define IP_SENDTOIF 0x8 /* send on specific ifnet */
158 #define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */
159 #define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */
162 * mbuf flag used by ip_fastfwd
164 #define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */
165 #define M_IP_NEXTHOP M_PROTO2 /* explicit ip nexthop */
167 #ifdef __NO_STRICT_ALIGNMENT
168 #define IP_HDR_ALIGNED_P(ip) 1
170 #define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
178 VNET_DECLARE(struct ipstat, ipstat);
179 VNET_DECLARE(u_short, ip_id); /* ip packet ctr, for ids */
180 VNET_DECLARE(int, ip_defttl); /* default IP ttl */
181 VNET_DECLARE(int, ipforwarding); /* ip forwarding */
183 VNET_DECLARE(int, ipstealth); /* stealth forwarding */
185 extern u_char ip_protox[];
186 VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/
187 VNET_DECLARE(struct socket *, ip_mrouter); /* multicast routing daemon */
188 extern int (*legal_vif_num)(int);
189 extern u_long (*ip_mcast_src)(int);
190 VNET_DECLARE(int, rsvp_on);
191 VNET_DECLARE(int, drop_redirect);
192 extern struct pr_usrreqs rip_usrreqs;
194 #define V_ipstat VNET(ipstat)
195 #define V_ip_id VNET(ip_id)
196 #define V_ip_defttl VNET(ip_defttl)
197 #define V_ipforwarding VNET(ipforwarding)
199 #define V_ipstealth VNET(ipstealth)
201 #define V_ip_rsvpd VNET(ip_rsvpd)
202 #define V_ip_mrouter VNET(ip_mrouter)
203 #define V_rsvp_on VNET(rsvp_on)
204 #define V_drop_redirect VNET(drop_redirect)
206 void inp_freemoptions(struct ip_moptions *);
207 int inp_getmoptions(struct inpcb *, struct sockopt *);
208 int inp_setmoptions(struct inpcb *, struct sockopt *);
210 int ip_ctloutput(struct socket *, struct sockopt *sopt);
212 int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
213 u_long if_hwassist_flags, int sw_csum);
214 void ip_forward(struct mbuf *m, int srcrt);
217 void ip_destroy(void);
220 (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
221 struct ip_moptions *);
222 int ip_output(struct mbuf *,
223 struct mbuf *, struct route *, int, struct ip_moptions *,
225 int ipproto_register(short);
226 int ipproto_unregister(short);
228 ip_reass(struct mbuf *);
230 ip_rtaddr(struct in_addr, u_int fibnum);
231 void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
233 void ip_slowtimo(void);
234 u_int16_t ip_randomid(void);
235 int rip_ctloutput(struct socket *, struct sockopt *);
236 void rip_ctlinput(int, struct sockaddr *, void *);
239 void rip_destroy(void);
241 void rip_input(struct mbuf *, int);
242 int rip_output(struct mbuf *, struct socket *, u_long);
243 void ipip_input(struct mbuf *, int);
244 void rsvp_input(struct mbuf *, int);
245 int ip_rsvp_init(struct socket *);
246 int ip_rsvp_done(void);
247 extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
248 extern void (*ip_rsvp_force_done)(struct socket *);
249 extern void (*rsvp_input_p)(struct mbuf *m, int off);
251 VNET_DECLARE(struct pfil_head, inet_pfil_hook); /* packet filter hooks */
252 #define V_inet_pfil_hook VNET(inet_pfil_hook)
254 void in_delayed_cksum(struct mbuf *m);
256 /* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */
258 * Reference to an ipfw or packet filter rule that can be carried
259 * outside critical sections.
260 * A rule is identified by rulenum:rule_id which is ordered.
261 * In version chain_id the rule can be found in slot 'slot', so
262 * we don't need a lookup if chain_id == chain->id.
264 * On exit from the firewall this structure refers to the rule after
265 * the matching one (slot points to the new rule; rulenum:rule_id-1
266 * is the matching rule), and additional info (e.g. info often contains
267 * the insn argument or tablearg in the low 16 bits, in host format).
268 * On entry, the structure is valid if slot>0, and refers to the starting
269 * rules. 'info' contains the reason for reinject, e.g. divert port,
270 * divert direction, and so on.
272 struct ipfw_rule_ref {
273 uint32_t slot; /* slot for matching rule */
274 uint32_t rulenum; /* matching rule number */
275 uint32_t rule_id; /* matching rule id */
276 uint32_t chain_id; /* ruleset id */
277 uint32_t info; /* see below */
281 IPFW_INFO_MASK = 0x0000ffff,
282 IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */
283 IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */
284 IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */
285 IPFW_IS_MASK = 0x30000000, /* which source ? */
286 IPFW_IS_DIVERT = 0x20000000,
287 IPFW_IS_DUMMYNET =0x10000000,
288 IPFW_IS_PIPE = 0x08000000, /* pip1=1, queue = 0 */
290 #define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */
291 #define MTAG_IPFW_RULE 1262273568 /* rule reference */
292 #define MTAG_IPFW_CALL 1308397630 /* call stack */
295 typedef int (*ip_fw_chk_ptr_t)(struct ip_fw_args *args);
296 typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *);
297 VNET_DECLARE(ip_fw_chk_ptr_t, ip_fw_chk_ptr);
298 VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr);
299 #define V_ip_fw_chk_ptr VNET(ip_fw_chk_ptr)
300 #define V_ip_fw_ctl_ptr VNET(ip_fw_ctl_ptr)
303 extern void (*ip_divert_ptr)(struct mbuf *m, int incoming);
304 /* ng_ipfw hooks -- XXX make it the same as divert and dummynet */
305 extern int (*ng_ipfw_input_p)(struct mbuf **, int,
306 struct ip_fw_args *, int);
308 extern int (*ip_dn_ctl_ptr)(struct sockopt *);
309 extern int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *);
311 VNET_DECLARE(int, ip_do_randomid);
312 #define V_ip_do_randomid VNET(ip_do_randomid)
313 #define ip_newid() ((V_ip_do_randomid != 0) ? ip_randomid() : \
318 #endif /* !_NETINET_IP_VAR_H_ */