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29 * @(#)protosw.h 8.1 (Berkeley) 6/2/93
33 #ifndef _SYS_PROTOSW_H_
34 #define _SYS_PROTOSW_H_
36 /* Forward declare these structures referenced from prototypes below. */
45 * Protocol switch table.
47 * Each protocol has a handle initializing one of these structures,
48 * which is used for protocol-protocol and system-protocol communication.
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.
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.
63 * In retrospect, it would be a lot nicer to use an interface
64 * similar to the vnode VOP interface.
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);
79 typedef int pr_usrreq_t(struct socket *, int, struct mbuf *,
80 struct mbuf *, struct mbuf *, struct thread *);
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;
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 */
100 struct pr_usrreqs *pr_usrreqs; /* supersedes pr_usrreq() */
104 #define PR_SLOWHZ 2 /* 2 slow timeouts per second */
105 #define PR_FASTHZ 5 /* 5 fast timeouts per second */
108 * This number should be defined again within each protocol family to avoid
111 #define PROTO_SPACER 32767 /* spacer for loadable protocols */
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
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 */
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.
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.
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 */
176 const char *prurequests[] = {
177 "ATTACH", "DETACH", "BIND", "LISTEN",
178 "CONNECT", "ACCEPT", "DISCONNECT", "SHUTDOWN",
179 "RCVD", "SEND", "ABORT", "CONTROL",
180 "SENSE", "RCVOOB", "SENDOOB", "SOCKADDR",
181 "PEERADDR", "CONNECT2", "FASTTIMO", "SLOWTIMO",
182 "PROTORCV", "PROTOSEND",
187 #ifdef _KERNEL /* users shouldn't see this decl */
195 * If the ordering here looks odd, that's because it's alphabetical. These
196 * should eventually be merged back into struct protosw.
198 * Some fields initialized to defaults if they are NULL.
199 * See uipc_domain.c:net_init_domain()
202 double __Break_the_struct_layout_for_now;
203 int (*pru_abort)(struct socket *so);
204 int (*pru_accept)(struct socket *so, struct sockaddr **nam);
205 int (*pru_attach)(struct socket *so, int proto, struct thread *td);
206 int (*pru_bind)(struct socket *so, struct sockaddr *nam,
208 int (*pru_connect)(struct socket *so, struct sockaddr *nam,
210 int (*pru_connect2)(struct socket *so1, struct socket *so2);
211 int (*pru_control)(struct socket *so, u_long cmd, caddr_t data,
212 struct ifnet *ifp, struct thread *td);
213 int (*pru_detach)(struct socket *so);
214 int (*pru_disconnect)(struct socket *so);
215 int (*pru_listen)(struct socket *so, struct thread *td);
216 int (*pru_peeraddr)(struct socket *so, struct sockaddr **nam);
217 int (*pru_rcvd)(struct socket *so, int flags);
218 int (*pru_rcvoob)(struct socket *so, struct mbuf *m, int flags);
219 int (*pru_send)(struct socket *so, int flags, struct mbuf *m,
220 struct sockaddr *addr, struct mbuf *control,
224 #define PRUS_MORETOCOME 0x4
225 int (*pru_sense)(struct socket *so, struct stat *sb);
226 int (*pru_shutdown)(struct socket *so);
227 int (*pru_sockaddr)(struct socket *so, struct sockaddr **nam);
230 * These four added later, so they are out of order. They are used
231 * for shortcutting (fast path input/output) in some protocols.
232 * XXX - that's a lie, they are not implemented yet
233 * Rather than calling sosend() etc. directly, calls are made
234 * through these entry points. For protocols which still use
235 * the generic code, these just point to those routines.
237 int (*pru_sosend)(struct socket *so, struct sockaddr *addr,
238 struct uio *uio, struct mbuf *top, struct mbuf *control,
239 int flags, struct thread *td);
240 int (*pru_soreceive)(struct socket *so, struct sockaddr **paddr,
241 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
243 int (*pru_sopoll)(struct socket *so, int events,
244 struct ucred *cred, struct thread *td);
245 void (*pru_sosetlabel)(struct socket *so);
249 * The dummy protocol specific user requests function pointer array is
250 * initialized to the functions below. All functions return EOPNOTSUPP.
252 extern struct pr_usrreqs nousrreqs;
254 int pru_abort_notsupp(struct socket *so);
255 int pru_accept_notsupp(struct socket *so, struct sockaddr **nam);
256 int pru_attach_notsupp(struct socket *so, int proto, struct thread *td);
257 int pru_bind_notsupp(struct socket *so, struct sockaddr *nam,
259 int pru_connect_notsupp(struct socket *so, struct sockaddr *nam,
261 int pru_connect2_notsupp(struct socket *so1, struct socket *so2);
262 int pru_control_notsupp(struct socket *so, u_long cmd, caddr_t data,
263 struct ifnet *ifp, struct thread *td);
264 int pru_detach_notsupp(struct socket *so);
265 int pru_disconnect_notsupp(struct socket *so);
266 int pru_listen_notsupp(struct socket *so, struct thread *td);
267 int pru_peeraddr_notsupp(struct socket *so, struct sockaddr **nam);
268 int pru_rcvd_notsupp(struct socket *so, int flags);
269 int pru_rcvoob_notsupp(struct socket *so, struct mbuf *m, int flags);
270 int pru_send_notsupp(struct socket *so, int flags, struct mbuf *m,
271 struct sockaddr *addr, struct mbuf *control, struct thread *td);
272 int pru_sense_null(struct socket *so, struct stat *sb);
273 int pru_shutdown_notsupp(struct socket *so);
274 int pru_sockaddr_notsupp(struct socket *so, struct sockaddr **nam);
275 int pru_sosend_notsupp(struct socket *so, struct sockaddr *addr,
276 struct uio *uio, struct mbuf *top, struct mbuf *control, int flags,
278 int pru_soreceive_notsupp(struct socket *so, struct sockaddr **paddr,
279 struct uio *uio, struct mbuf **mp0, struct mbuf **controlp,
281 int pru_sopoll_notsupp(struct socket *so, int events, struct ucred *cred,
283 void pru_sosetlabel_null(struct socket *so);
288 * The arguments to the ctlinput routine are
289 * (*protosw[].pr_ctlinput)(cmd, sa, arg);
290 * where cmd is one of the commands below, sa is a pointer to a sockaddr,
291 * and arg is a `void *' argument used within a protocol family.
293 #define PRC_IFDOWN 0 /* interface transition */
294 #define PRC_ROUTEDEAD 1 /* select new route if possible ??? */
295 #define PRC_IFUP 2 /* interface has come back up */
296 #define PRC_QUENCH2 3 /* DEC congestion bit says slow down */
297 #define PRC_QUENCH 4 /* some one said to slow down */
298 #define PRC_MSGSIZE 5 /* message size forced drop */
299 #define PRC_HOSTDEAD 6 /* host appears to be down */
300 #define PRC_HOSTUNREACH 7 /* deprecated (use PRC_UNREACH_HOST) */
301 #define PRC_UNREACH_NET 8 /* no route to network */
302 #define PRC_UNREACH_HOST 9 /* no route to host */
303 #define PRC_UNREACH_PROTOCOL 10 /* dst says bad protocol */
304 #define PRC_UNREACH_PORT 11 /* bad port # */
305 /* was PRC_UNREACH_NEEDFRAG 12 (use PRC_MSGSIZE) */
306 #define PRC_UNREACH_SRCFAIL 13 /* source route failed */
307 #define PRC_REDIRECT_NET 14 /* net routing redirect */
308 #define PRC_REDIRECT_HOST 15 /* host routing redirect */
309 #define PRC_REDIRECT_TOSNET 16 /* redirect for type of service & net */
310 #define PRC_REDIRECT_TOSHOST 17 /* redirect for tos & host */
311 #define PRC_TIMXCEED_INTRANS 18 /* packet lifetime expired in transit */
312 #define PRC_TIMXCEED_REASS 19 /* lifetime expired on reass q */
313 #define PRC_PARAMPROB 20 /* header incorrect */
314 #define PRC_UNREACH_ADMIN_PROHIB 21 /* packet administrativly prohibited */
318 #define PRC_IS_REDIRECT(cmd) \
319 ((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST)
322 char *prcrequests[] = {
323 "IFDOWN", "ROUTEDEAD", "IFUP", "DEC-BIT-QUENCH2",
324 "QUENCH", "MSGSIZE", "HOSTDEAD", "#7",
325 "NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",
326 "#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",
327 "TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",
328 "PARAMPROB", "ADMIN-UNREACH"
333 * The arguments to ctloutput are:
334 * (*protosw[].pr_ctloutput)(req, so, level, optname, optval, p);
335 * req is one of the actions listed below, so is a (struct socket *),
336 * level is an indication of which protocol layer the option is intended.
337 * optname is a protocol dependent socket option request,
338 * optval is a pointer to a mbuf-chain pointer, for value-return results.
339 * The protocol is responsible for disposal of the mbuf chain *optval
341 * the caller is responsible for any space held by *optval, when returned.
342 * A non-zero return from usrreq gives an
343 * UNIX error number which should be passed to higher level software.
345 #define PRCO_GETOPT 0
346 #define PRCO_SETOPT 1
351 char *prcorequests[] = {
357 void pfctlinput(int, struct sockaddr *);
358 void pfctlinput2(int, struct sockaddr *, void *);
359 struct protosw *pffindproto(int family, int protocol, int type);
360 struct protosw *pffindtype(int family, int type);
361 int pf_proto_register(int family, struct protosw *npr);
362 int pf_proto_unregister(int family, int protocol, int type);