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33 * @(#)protosw.h 8.1 (Berkeley) 6/2/93
34 * $FreeBSD: src/sys/sys/protosw.h,v 1.28.2.2 2001/07/03 11:02:01 ume Exp $
37 #ifndef _SYS_PROTOSW_H_
38 #define _SYS_PROTOSW_H_
41 #include <sys/types.h>
44 /* Forward declare these structures referenced from prototypes below. */
51 struct pr_output_info {
55 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
58 * netmsg_t union of possible netmsgs typically sent to protocol threads.
60 typedef union netmsg *netmsg_t;
63 * Protocol switch table.
65 * Each protocol has a handle initializing one of these structures,
66 * which is used for protocol-protocol and system-protocol communication.
68 * A protocol is called through the pr_init entry before any other.
69 * Thereafter it is called every 200ms through the pr_fasttimo entry and
70 * every 500ms through the pr_slowtimo for timer based actions.
71 * The system will call the pr_drain entry if it is low on space and
72 * this should throw away any non-critical data.
74 * Protocols pass data between themselves as chains of mbufs using
75 * the pr_input and pr_output hooks. Pr_input passes data up (towards
76 * the users) and pr_output passes it down (towards the interfaces); control
77 * information passes up and down on pr_ctlinput and pr_ctloutput.
78 * The protocol is responsible for the space occupied by any the
79 * arguments to these entries and must dispose it.
81 * In retrospect, it would be a lot nicer to use an interface
82 * similar to the vnode VOP interface.
85 short pr_type; /* socket type used for */
86 const struct domain *pr_domain; /* domain protocol a member of */
87 short pr_protocol; /* protocol number */
88 short pr_flags; /* see below */
90 struct lwkt_port *(*pr_initport)(void);
94 * Protocol hooks. These are typically called directly within the
95 * context of a protocol thread based on the toeplitz hash.
97 * pr_input() is called using the port supplied by the toeplitz
98 * hash via the netisr port function.
100 * pr_ctlinput() is called using the port supplied by pr_ctlport
102 * pr_ctloutput() and pr_output() are typically called
104 int (*pr_input)(struct mbuf **, int *, int);
105 /* input to protocol (from below) */
106 int (*pr_output)(struct mbuf *, struct socket *, ...);
107 /* output to protocol (from above) */
108 void (*pr_ctlinput)(netmsg_t);
109 /* control input (from below) */
110 void (*pr_ctloutput)(netmsg_t);
111 /* control output (from above) */
112 struct lwkt_port *(*pr_ctlport)(int, struct sockaddr *, void *, int *);
115 * Utility hooks, not called with any particular context.
117 void (*pr_init) (void); /* initialization hook */
118 void (*pr_fasttimo) (void); /* fast timeout (200ms) */
119 void (*pr_slowtimo) (void); /* slow timeout (500ms) */
120 void (*pr_drain) (void); /* flush any excess space possible */
122 struct pr_usrreqs *pr_usrreqs; /* messaged requests to proto thread */
127 #define PR_SLOWHZ 2 /* 2 slow timeouts per second */
128 #define PR_FASTHZ 5 /* 5 fast timeouts per second */
131 * Values for pr_flags.
132 * PR_ADDR requires PR_ATOMIC;
133 * PR_ADDR and PR_CONNREQUIRED are mutually exclusive.
134 * PR_IMPLOPCL means that the protocol allows sendto without prior connect,
135 * and the protocol understands the MSG_EOF flag. The first property is
136 * is only relevant if PR_CONNREQUIRED is set (otherwise sendto is allowed
139 #define PR_ATOMIC 0x01 /* exchange atomic messages only */
140 #define PR_ADDR 0x02 /* addresses given with messages */
141 #define PR_CONNREQUIRED 0x04 /* connection required by protocol */
142 #define PR_WANTRCVD 0x08 /* want PRU_RCVD calls */
143 #define PR_RIGHTS 0x10 /* passes capabilities */
144 #define PR_IMPLOPCL 0x20 /* implied open/close */
145 #define PR_LASTHDR 0x40 /* enforce ipsec policy; last header */
146 #define PR_UNUSED07 0x80 /* was: allow addresses during delivery (SCTP) */
147 #define PR_MPSAFE 0x0100 /* protocal is MPSAFE */
148 #define PR_SYNC_PORT 0x0200 /* synchronous port (no proto thrds) */
149 #define PR_ASYNC_SEND 0x0400 /* async pru_send */
150 #define PR_ASYNC_RCVD 0x0800 /* async pru_rcvd */
151 #define PR_ASEND_HOLDTD 0x1000 /* async pru_send hold orig thread */
152 #define PR_ACONN_HOLDTD 0x2000 /* async pru_connect hold orig thread */
155 * The arguments to usrreq are:
156 * (*protosw[].pr_usrreq)(up, req, m, nam, opt);
157 * where up is a (struct socket *), req is one of these requests,
158 * m is a optional mbuf chain containing a message,
159 * nam is an optional mbuf chain containing an address,
160 * and opt is a pointer to a socketopt structure or nil.
161 * The protocol is responsible for disposal of the mbuf chain m,
162 * the caller is responsible for any space held by nam and opt.
163 * A non-zero return from usrreq gives an
164 * UNIX error number which should be passed to higher level software.
166 #define PRU_ATTACH 0 /* attach protocol to up */
167 #define PRU_DETACH 1 /* detach protocol from up */
168 #define PRU_BIND 2 /* bind socket to address */
169 #define PRU_LISTEN 3 /* listen for connection */
170 #define PRU_CONNECT 4 /* establish connection to peer */
171 #define PRU_ACCEPT 5 /* accept connection from peer */
172 #define PRU_DISCONNECT 6 /* disconnect from peer */
173 #define PRU_SHUTDOWN 7 /* won't send any more data */
174 #define PRU_RCVD 8 /* have taken data; more room now */
175 #define PRU_SEND 9 /* send this data */
176 #define PRU_ABORT 10 /* abort (fast DISCONNECT, DETATCH) */
177 #define PRU_CONTROL 11 /* control operations on protocol */
178 #define PRU_SENSE 12 /* return status into m */
179 #define PRU_RCVOOB 13 /* retrieve out of band data */
180 #define PRU_SENDOOB 14 /* send out of band data */
181 #define PRU_SOCKADDR 15 /* fetch socket's address */
182 #define PRU_PEERADDR 16 /* fetch peer's address */
183 #define PRU_CONNECT2 17 /* connect two sockets */
184 #define PRU_RESERVED1 18 /* formerly PRU_SOPOLL */
185 /* begin for protocols internal use */
186 #define PRU_FASTTIMO 19 /* 200ms timeout */
187 #define PRU_SLOWTIMO 20 /* 500ms timeout */
188 #define PRU_PROTORCV 21 /* receive from below */
189 #define PRU_PROTOSEND 22 /* send to below */
190 /* end for protocol's internal use */
191 #define PRU_SEND_EOF 23 /* send and close */
193 #define PRU_CTLOUTPUT 25 /* get/set opts */
197 const char *prurequests[] = {
198 "ATTACH", "DETACH", "BIND", "LISTEN",
199 "CONNECT", "ACCEPT", "DISCONNECT", "SHUTDOWN",
200 "RCVD", "SEND", "ABORT", "CONTROL",
201 "SENSE", "RCVOOB", "SENDOOB", "SOCKADDR",
202 "PEERADDR", "CONNECT2", "",
203 "FASTTIMO", "SLOWTIMO", "PROTORCV", "PROTOSEND",
204 "SEND_EOF", "PREDICATE"
208 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
216 struct pru_attach_info {
217 struct rlimit *sb_rlimit;
218 struct ucred *p_ucred;
219 struct vnode *fd_rdir;
223 * These are netmsg'd requests almost universally in the context of the
224 * appropriate protocol thread. Exceptions:
226 * pru_sosend() - called synchronously from user context, typically
227 * runs generic kernel code and then messages via
230 * pru_soreceive() - called synchronously from user context. Typically
231 * runs generic kernel code and remains synchronous.
233 * pru_preconnect() - called synchronously from user context. Typically
234 * prepares for later asynchronous pru_connect, e.g.
235 * sets ISCONNECTING. Non-NULL means asynchronous
236 * pru_connect is supported.
239 void (*pru_abort) (netmsg_t msg);
240 void (*pru_accept) (netmsg_t msg);
241 void (*pru_attach) (netmsg_t msg);
242 void (*pru_bind) (netmsg_t msg);
243 void (*pru_connect) (netmsg_t msg);
244 void (*pru_connect2) (netmsg_t msg);
245 void (*pru_control) (netmsg_t msg);
247 * If pru_detach() returns EJUSTRETURN, then protocol will
248 * call sodiscard() and sofree() for soclose().
250 void (*pru_detach) (netmsg_t msg);
251 void (*pru_disconnect) (netmsg_t msg);
252 void (*pru_listen) (netmsg_t msg);
253 void (*pru_peeraddr) (netmsg_t msg);
254 void (*pru_rcvd) (netmsg_t msg);
255 void (*pru_rcvoob) (netmsg_t msg);
256 void (*pru_send) (netmsg_t msg);
257 void (*pru_sense) (netmsg_t msg);
258 void (*pru_shutdown) (netmsg_t msg);
259 void (*pru_sockaddr) (netmsg_t msg);
262 * These are direct calls. Note that sosend() will sometimes
263 * be converted into an implied connect (pru_connect) with the
264 * mbufs and flags forwarded in pru_connect's netmsg. It is
265 * otherwise typically converted to a send (pru_send).
267 * soreceive() typically remains synchronous in the user's context.
269 * Any converted calls are netmsg's to the socket's protocol thread.
271 int (*pru_sosend) (struct socket *so, struct sockaddr *addr,
272 struct uio *uio, struct mbuf *top,
273 struct mbuf *control, int flags,
275 int (*pru_soreceive) (struct socket *so,
276 struct sockaddr **paddr,
279 struct mbuf **controlp, int *flagsp);
282 * Synchronously called by protocol thread. Typically save the
283 * foreign address into socket.so_faddr.
285 void (*pru_savefaddr) (struct socket *so,
286 const struct sockaddr *addr);
288 /* synchronously called by user thread. */
289 int (*pru_preconnect) (struct socket *so,
290 const struct sockaddr *addr,
294 typedef int (*pru_sosend_fn_t) (struct socket *so, struct sockaddr *addr,
295 struct uio *uio, struct mbuf *top,
296 struct mbuf *control, int flags,
298 typedef int (*pru_soreceive_fn_t) (struct socket *so, struct sockaddr **paddr,
301 struct mbuf **controlp,
304 void pr_generic_notsupp(netmsg_t msg);
305 void pru_sense_null(netmsg_t msg);
307 int pru_sosend_notsupp(struct socket *so, struct sockaddr *addr,
308 struct uio *uio, struct mbuf *top,
309 struct mbuf *control, int flags,
311 int pru_soreceive_notsupp(struct socket *so,
312 struct sockaddr **paddr,
315 struct mbuf **controlp, int *flagsp);
317 struct lwkt_port *cpu0_soport(struct socket *, struct sockaddr *,
319 struct lwkt_port *cpu0_ctlport(int, struct sockaddr *, void *, int *);
321 #endif /* _KERNEL || _KERNEL_STRUCTURES */
324 * The arguments to the ctlinput routine are
325 * (*protosw[].pr_ctlinput)(cmd, sa, arg);
326 * where cmd is one of the commands below, sa is a pointer to a sockaddr,
327 * and arg is a `void *' argument used within a protocol family.
329 #define PRC_IFDOWN 0 /* interface transition */
330 #define PRC_ROUTEDEAD 1 /* select new route if possible ??? */
331 #define PRC_IFUP 2 /* interface has come back up */
332 #define PRC_QUENCH2 3 /* DEC congestion bit says slow down */
333 #define PRC_QUENCH 4 /* some one said to slow down */
334 #define PRC_MSGSIZE 5 /* message size forced drop */
335 #define PRC_HOSTDEAD 6 /* host appears to be down */
336 #define PRC_HOSTUNREACH 7 /* deprecated (use PRC_UNREACH_HOST) */
337 #define PRC_UNREACH_NET 8 /* no route to network */
338 #define PRC_UNREACH_HOST 9 /* no route to host */
339 #define PRC_UNREACH_PROTOCOL 10 /* dst says bad protocol */
340 #define PRC_UNREACH_PORT 11 /* bad port # */
341 /* was PRC_UNREACH_NEEDFRAG 12 (use PRC_MSGSIZE) */
342 #define PRC_UNREACH_SRCFAIL 13 /* source route failed */
343 #define PRC_REDIRECT_NET 14 /* net routing redirect */
344 #define PRC_REDIRECT_HOST 15 /* host routing redirect */
345 #define PRC_REDIRECT_TOSNET 16 /* redirect for type of service & net */
346 #define PRC_REDIRECT_TOSHOST 17 /* redirect for tos & host */
347 #define PRC_TIMXCEED_INTRANS 18 /* packet lifetime expired in transit */
348 #define PRC_TIMXCEED_REASS 19 /* lifetime expired on reass q */
349 #define PRC_PARAMPROB 20 /* header incorrect */
350 #define PRC_UNREACH_ADMIN_PROHIB 21 /* packet administrativly prohibited */
354 #define PRC_IS_REDIRECT(cmd) \
355 ((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST)
358 const char *prcrequests[] = {
359 "IFDOWN", "ROUTEDEAD", "IFUP", "DEC-BIT-QUENCH2",
360 "QUENCH", "MSGSIZE", "HOSTDEAD", "#7",
361 "NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",
362 "#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",
363 "TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",
364 "PARAMPROB", "ADMIN-UNREACH"
369 * The arguments to ctloutput are:
370 * (*protosw[].pr_ctloutput)(req, so, level, optname, optval, p);
371 * req is one of the actions listed below, so is a (struct socket *),
372 * level is an indication of which protocol layer the option is intended.
373 * optname is a protocol dependent socket option request,
374 * optval is a pointer to a mbuf-chain pointer, for value-return results.
375 * The protocol is responsible for disposal of the mbuf chain *optval
377 * the caller is responsible for any space held by *optval, when returned.
378 * A non-zero return from usrreq gives an
379 * UNIX error number which should be passed to higher level software.
381 #define PRCO_GETOPT 0
382 #define PRCO_SETOPT 1
387 const char *prcorequests[] = {
397 void kpfctlinput (int, struct sockaddr *);
398 void kpfctlinput_direct (int, struct sockaddr *);
399 void kpfctlinput2 (int, struct sockaddr *, void *);
400 struct protosw *pffindproto (int family, int protocol, int type);
401 struct protosw *pffindtype (int family, int type);
403 #define PR_GET_MPLOCK(_pr) \
405 if (((_pr)->pr_flags & PR_MPSAFE) == 0) \
409 #define PR_REL_MPLOCK(_pr) \
411 if (((_pr)->pr_flags & PR_MPSAFE) == 0) \
417 #endif /* _SYS_PROTOSW_H_ */