FreeBSD/Linux Kernel Cross Reference
sys/sys/protosw.h
1 /*-
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)protosw.h 8.1 (Berkeley) 6/2/93
30 * $FreeBSD$
31 */
32
33 #ifndef _SYS_PROTOSW_H_
34 #define _SYS_PROTOSW_H_
35
36 /* Forward declare these structures referenced from prototypes below. */
37 struct mbuf;
38 struct thread;
39 struct sockaddr;
40 struct socket;
41 struct sockopt;
42
43 /*#ifdef _KERNEL*/
44 /*
45 * Protocol switch table.
46 *
47 * Each protocol has a handle initializing one of these structures,
48 * which is used for protocol-protocol and system-protocol communication.
49 *
50 * A protocol is called through the pr_init entry before any other.
51 * Thereafter it is called every 200ms through the pr_fasttimo entry and
52 * every 500ms through the pr_slowtimo for timer based actions.
53 * The system will call the pr_drain entry if it is low on space and
54 * this should throw away any non-critical data.
55 *
56 * Protocols pass data between themselves as chains of mbufs using
57 * the pr_input and pr_output hooks. Pr_input passes data up (towards
58 * the users) and pr_output passes it down (towards the interfaces); control
59 * information passes up and down on pr_ctlinput and pr_ctloutput.
60 * The protocol is responsible for the space occupied by any the
61 * arguments to these entries and must dispose it.
62 *
63 * In retrospect, it would be a lot nicer to use an interface
64 * similar to the vnode VOP interface.
65 */
66 /* USE THESE FOR YOUR PROTOTYPES ! */
67 typedef void pr_input_t (struct mbuf *, int);
68 typedef int pr_input6_t (struct mbuf **, int*, int); /* XXX FIX THIS */
69 typedef void pr_in_input_t (struct mbuf *, int, int); /* XXX FIX THIS */
70 typedef int pr_output_t (struct mbuf *, struct socket *);
71 typedef int pr_in_output_t (struct mbuf *, struct socket *, struct sockaddr *);
72 typedef void pr_ctlinput_t (int, struct sockaddr *, void *);
73 typedef int pr_ctloutput_t (struct socket *, struct sockopt *);
74 typedef void pr_init_t (void);
75 typedef void pr_fasttimo_t (void);
76 typedef void pr_slowtimo_t (void);
77 typedef void pr_drain_t (void);
78
79 typedef int pr_usrreq_t(struct socket *, int, struct mbuf *,
80 struct mbuf *, struct mbuf *, struct thread *);
81
82 struct protosw {
83 short pr_type; /* socket type used for */
84 struct domain *pr_domain; /* domain protocol a member of */
85 short pr_protocol; /* protocol number */
86 short pr_flags; /* see below */
87 /* protocol-protocol hooks */
88 pr_input_t *pr_input; /* input to protocol (from below) */
89 pr_output_t *pr_output; /* output to protocol (from above) */
90 pr_ctlinput_t *pr_ctlinput; /* control input (from below) */
91 pr_ctloutput_t *pr_ctloutput; /* control output (from above) */
92 /* user-protocol hook */
93 pr_usrreq_t *pr_ousrreq;
94 /* utility hooks */
95 pr_init_t *pr_init;
96 pr_fasttimo_t *pr_fasttimo; /* fast timeout (200ms) */
97 pr_slowtimo_t *pr_slowtimo; /* slow timeout (500ms) */
98 pr_drain_t *pr_drain; /* flush any excess space possible */
99
100 struct pr_usrreqs *pr_usrreqs; /* supersedes pr_usrreq() */
101 };
102 /*#endif*/
103
104 #define PR_SLOWHZ 2 /* 2 slow timeouts per second */
105 #define PR_FASTHZ 5 /* 5 fast timeouts per second */
106
107 /*
108 * This number should be defined again within each protocol family to avoid
109 * confusion.
110 */
111 #define PROTO_SPACER 32767 /* spacer for loadable protocols */
112
113 /*
114 * Values for pr_flags.
115 * PR_ADDR requires PR_ATOMIC;
116 * PR_ADDR and PR_CONNREQUIRED are mutually exclusive.
117 * PR_IMPLOPCL means that the protocol allows sendto without prior connect,
118 * and the protocol understands the MSG_EOF flag. The first property is
119 * is only relevant if PR_CONNREQUIRED is set (otherwise sendto is allowed
120 * anyhow).
121 */
122 #define PR_ATOMIC 0x01 /* exchange atomic messages only */
123 #define PR_ADDR 0x02 /* addresses given with messages */
124 #define PR_CONNREQUIRED 0x04 /* connection required by protocol */
125 #define PR_WANTRCVD 0x08 /* want PRU_RCVD calls */
126 #define PR_RIGHTS 0x10 /* passes capabilities */
127 #define PR_IMPLOPCL 0x20 /* implied open/close */
128 #define PR_LASTHDR 0x40 /* enforce ipsec policy; last header */
129
130 /*
131 * In earlier BSD network stacks, a single pr_usrreq() function pointer was
132 * invoked with an operation number indicating what operation was desired.
133 * We now provide individual function pointers which protocols can implement,
134 * which offers a number of benefits (such as type checking for arguments).
135 * These older constants are still present in order to support TCP debugging.
136 *
137 * The arguments to usrreq were:
138 * (*protosw[].pr_usrreq)(up, req, m, nam, opt);
139 * where up is a (struct socket *), req is one of these requests,
140 * m is an optional mbuf chain containing a message,
141 * nam is an optional mbuf chain containing an address,
142 * and opt is a pointer to a socketopt structure or nil.
143 * The protocol is responsible for disposal of the mbuf chain m,
144 * the caller is responsible for any space held by nam and opt.
145 * A non-zero return from usrreq gives an
146 * UNIX error number which should be passed to higher level software.
147 */
148 #define PRU_ATTACH 0 /* attach protocol to up */
149 #define PRU_DETACH 1 /* detach protocol from up */
150 #define PRU_BIND 2 /* bind socket to address */
151 #define PRU_LISTEN 3 /* listen for connection */
152 #define PRU_CONNECT 4 /* establish connection to peer */
153 #define PRU_ACCEPT 5 /* accept connection from peer */
154 #define PRU_DISCONNECT 6 /* disconnect from peer */
155 #define PRU_SHUTDOWN 7 /* won't send any more data */
156 #define PRU_RCVD 8 /* have taken data; more room now */
157 #define PRU_SEND 9 /* send this data */
158 #define PRU_ABORT 10 /* abort (fast DISCONNECT, DETATCH) */
159 #define PRU_CONTROL 11 /* control operations on protocol */
160 #define PRU_SENSE 12 /* return status into m */
161 #define PRU_RCVOOB 13 /* retrieve out of band data */
162 #define PRU_SENDOOB 14 /* send out of band data */
163 #define PRU_SOCKADDR 15 /* fetch socket's address */
164 #define PRU_PEERADDR 16 /* fetch peer's address */
165 #define PRU_CONNECT2 17 /* connect two sockets */
166 /* begin for protocols internal use */
167 #define PRU_FASTTIMO 18 /* 200ms timeout */
168 #define PRU_SLOWTIMO 19 /* 500ms timeout */
169 #define PRU_PROTORCV 20 /* receive from below */
170 #define PRU_PROTOSEND 21 /* send to below */
171 /* end for protocol's internal use */
172 #define PRU_SEND_EOF 22 /* send and close */
173 #define PRU_SOSETLABEL 23 /* MAC label change */
174 #define PRU_CLOSE 24 /* socket close */
175 #define PRU_NREQ 24
176
177 #ifdef PRUREQUESTS
178 const char *prurequests[] = {
179 "ATTACH", "DETACH", "BIND", "LISTEN",
180 "CONNECT", "ACCEPT", "DISCONNECT", "SHUTDOWN",
181 "RCVD", "SEND", "ABORT", "CONTROL",
182 "SENSE", "RCVOOB", "SENDOOB", "SOCKADDR",
183 "PEERADDR", "CONNECT2", "FASTTIMO", "SLOWTIMO",
184 "PROTORCV", "PROTOSEND", "SEND_EOF", "SOSETLABEL",
185 "CLOSE",
186 };
187 #endif
188
189 #ifdef _KERNEL /* users shouldn't see this decl */
190
191 struct ifnet;
192 struct stat;
193 struct ucred;
194 struct uio;
195
196 /*
197 * If the ordering here looks odd, that's because it's alphabetical. These
198 * should eventually be merged back into struct protosw.
199 *
200 * Some fields initialized to defaults if they are NULL.
201 * See uipc_domain.c:net_init_domain()
202 */
203 struct pr_usrreqs {
204 double __Break_the_struct_layout_for_now;
205 void (*pru_abort)(struct socket *so);
206 int (*pru_accept)(struct socket *so, struct sockaddr **nam);
207 int (*pru_attach)(struct socket *so, int proto, struct thread *td);
208 int (*pru_bind)(struct socket *so, struct sockaddr *nam,
209 struct thread *td);
210 int (*pru_connect)(struct socket *so, struct sockaddr *nam,
211 struct thread *td);
212 int (*pru_connect2)(struct socket *so1, struct socket *so2);
213 int (*pru_control)(struct socket *so, u_long cmd, caddr_t data,
214 struct ifnet *ifp, struct thread *td);
215 void (*pru_detach)(struct socket *so);
216 int (*pru_disconnect)(struct socket *so);
217 int (*pru_listen)(struct socket *so, int backlog,
218 struct thread *td);
219 int (*pru_peeraddr)(struct socket *so, struct sockaddr **nam);
220 int (*pru_rcvd)(struct socket *so, int flags);
221 int (*pru_rcvoob)(struct socket *so, struct mbuf *m, int flags);
222 int (*pru_send)(struct socket *so, int flags, struct mbuf *m,
223 struct sockaddr *addr, struct mbuf *control,
224 struct thread *td);
225 #define PRUS_OOB 0x1
226 #define PRUS_EOF 0x2
227 #define PRUS_MORETOCOME 0x4
228 int (*pru_sense)(struct socket *so, struct stat *sb);
229 int (*pru_shutdown)(struct socket *so);
230 int (*pru_flush)(struct socket *so, int direction);
231 int (*pru_sockaddr)(struct socket *so, struct sockaddr **nam);
232 int (*pru_sosend)(struct socket *so, struct sockaddr *addr,
233 struct uio *uio, struct mbuf *top, struct mbuf *control,
234 int flags, struct thread *td);
235 int (*pru_soreceive)(struct socket *so, struct sockaddr **paddr,
236 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
237 int *flagsp);
238 int (*pru_sopoll)(struct socket *so, int events,
239 struct ucred *cred, struct thread *td);
240 void (*pru_sosetlabel)(struct socket *so);
241 void (*pru_close)(struct socket *so);
242 };
243
244 /*
245 * All nonvoid pru_*() functions below return EOPNOTSUPP.
246 */
247 int pru_accept_notsupp(struct socket *so, struct sockaddr **nam);
248 int pru_attach_notsupp(struct socket *so, int proto, struct thread *td);
249 int pru_bind_notsupp(struct socket *so, struct sockaddr *nam,
250 struct thread *td);
251 int pru_connect_notsupp(struct socket *so, struct sockaddr *nam,
252 struct thread *td);
253 int pru_connect2_notsupp(struct socket *so1, struct socket *so2);
254 int pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
255 struct ifnet *ifp, struct thread *td);
256 int pru_disconnect_notsupp(struct socket *so);
257 int pru_listen_notsupp(struct socket *so, int backlog, struct thread *td);
258 int pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam);
259 int pru_rcvd_notsupp(struct socket *so, int flags);
260 int pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags);
261 int pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
262 struct sockaddr *addr, struct mbuf *control, struct thread *td);
263 int pru_sense_null(struct socket *so, struct stat *sb);
264 int pru_shutdown_notsupp(struct socket *so);
265 int pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam);
266 int pru_sosend_notsupp(struct socket *so, struct sockaddr *addr,
267 struct uio *uio, struct mbuf *top, struct mbuf *control, int flags,
268 struct thread *td);
269 int pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
270 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
271 int *flagsp);
272 int pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
273 struct thread *td);
274
275 #endif /* _KERNEL */
276
277 /*
278 * The arguments to the ctlinput routine are
279 * (*protosw[].pr_ctlinput)(cmd, sa, arg);
280 * where cmd is one of the commands below, sa is a pointer to a sockaddr,
281 * and arg is a `void *' argument used within a protocol family.
282 */
283 #define PRC_IFDOWN 0 /* interface transition */
284 #define PRC_ROUTEDEAD 1 /* select new route if possible ??? */
285 #define PRC_IFUP 2 /* interface has come back up */
286 #define PRC_QUENCH2 3 /* DEC congestion bit says slow down */
287 #define PRC_QUENCH 4 /* some one said to slow down */
288 #define PRC_MSGSIZE 5 /* message size forced drop */
289 #define PRC_HOSTDEAD 6 /* host appears to be down */
290 #define PRC_HOSTUNREACH 7 /* deprecated (use PRC_UNREACH_HOST) */
291 #define PRC_UNREACH_NET 8 /* no route to network */
292 #define PRC_UNREACH_HOST 9 /* no route to host */
293 #define PRC_UNREACH_PROTOCOL 10 /* dst says bad protocol */
294 #define PRC_UNREACH_PORT 11 /* bad port # */
295 /* was PRC_UNREACH_NEEDFRAG 12 (use PRC_MSGSIZE) */
296 #define PRC_UNREACH_SRCFAIL 13 /* source route failed */
297 #define PRC_REDIRECT_NET 14 /* net routing redirect */
298 #define PRC_REDIRECT_HOST 15 /* host routing redirect */
299 #define PRC_REDIRECT_TOSNET 16 /* redirect for type of service & net */
300 #define PRC_REDIRECT_TOSHOST 17 /* redirect for tos & host */
301 #define PRC_TIMXCEED_INTRANS 18 /* packet lifetime expired in transit */
302 #define PRC_TIMXCEED_REASS 19 /* lifetime expired on reass q */
303 #define PRC_PARAMPROB 20 /* header incorrect */
304 #define PRC_UNREACH_ADMIN_PROHIB 21 /* packet administrativly prohibited */
305
306 #define PRC_NCMDS 22
307
308 #define PRC_IS_REDIRECT(cmd) \
309 ((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST)
310
311 #ifdef PRCREQUESTS
312 char *prcrequests[] = {
313 "IFDOWN", "ROUTEDEAD", "IFUP", "DEC-BIT-QUENCH2",
314 "QUENCH", "MSGSIZE", "HOSTDEAD", "#7",
315 "NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",
316 "#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",
317 "TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",
318 "PARAMPROB", "ADMIN-UNREACH"
319 };
320 #endif
321
322 /*
323 * The arguments to ctloutput are:
324 * (*protosw[].pr_ctloutput)(req, so, level, optname, optval, p);
325 * req is one of the actions listed below, so is a (struct socket *),
326 * level is an indication of which protocol layer the option is intended.
327 * optname is a protocol dependent socket option request,
328 * optval is a pointer to a mbuf-chain pointer, for value-return results.
329 * The protocol is responsible for disposal of the mbuf chain *optval
330 * if supplied,
331 * the caller is responsible for any space held by *optval, when returned.
332 * A non-zero return from usrreq gives an
333 * UNIX error number which should be passed to higher level software.
334 */
335 #define PRCO_GETOPT 0
336 #define PRCO_SETOPT 1
337
338 #define PRCO_NCMDS 2
339
340 #ifdef PRCOREQUESTS
341 char *prcorequests[] = {
342 "GETOPT", "SETOPT",
343 };
344 #endif
345
346 #ifdef _KERNEL
347 void pfctlinput(int, struct sockaddr *);
348 void pfctlinput2(int, struct sockaddr *, void *);
349 struct protosw *pffindproto(int family, int protocol, int type);
350 struct protosw *pffindtype(int family, int type);
351 int pf_proto_register(int family, struct protosw *npr);
352 int pf_proto_unregister(int family, int protocol, int type);
353 #endif
354
355 #endif
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