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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 $
35 * $DragonFly: src/sys/sys/protosw.h,v 1.4 2003/08/20 07:31:21 rob Exp $
38 #ifndef _SYS_PROTOSW_H_
39 #define _SYS_PROTOSW_H_
41 /* Forward declare these structures referenced from prototypes below. */
50 * Protocol switch table.
52 * Each protocol has a handle initializing one of these structures,
53 * which is used for protocol-protocol and system-protocol communication.
55 * A protocol is called through the pr_init entry before any other.
56 * Thereafter it is called every 200ms through the pr_fasttimo entry and
57 * every 500ms through the pr_slowtimo for timer based actions.
58 * The system will call the pr_drain entry if it is low on space and
59 * this should throw away any non-critical data.
61 * Protocols pass data between themselves as chains of mbufs using
62 * the pr_input and pr_output hooks. Pr_input passes data up (towards
63 * the users) and pr_output passes it down (towards the interfaces); control
64 * information passes up and down on pr_ctlinput and pr_ctloutput.
65 * The protocol is responsible for the space occupied by any the
66 * arguments to these entries and must dispose it.
68 * In retrospect, it would be a lot nicer to use an interface
69 * similar to the vnode VOP interface.
72 short pr_type; /* socket type used for */
73 struct domain *pr_domain; /* domain protocol a member of */
74 short pr_protocol; /* protocol number */
75 short pr_flags; /* see below */
76 /* protocol-protocol hooks */
77 void (*pr_input) (struct mbuf *, int len);
78 /* input to protocol (from below) */
79 int (*pr_output) (struct mbuf *m, struct socket *so);
80 /* output to protocol (from above) */
81 void (*pr_ctlinput)(int, struct sockaddr *, void *);
82 /* control input (from below) */
83 int (*pr_ctloutput)(struct socket *, struct sockopt *);
84 /* control output (from above) */
85 /* user-protocol hook */
88 void (*pr_init) (void); /* initialization hook */
89 void (*pr_fasttimo) (void);
90 /* fast timeout (200ms) */
91 void (*pr_slowtimo) (void);
92 /* slow timeout (500ms) */
93 void (*pr_drain) (void);
94 /* flush any excess space possible */
95 struct pr_usrreqs *pr_usrreqs; /* supersedes pr_usrreq() */
99 #define PR_SLOWHZ 2 /* 2 slow timeouts per second */
100 #define PR_FASTHZ 5 /* 5 fast timeouts per second */
103 * Values for pr_flags.
104 * PR_ADDR requires PR_ATOMIC;
105 * PR_ADDR and PR_CONNREQUIRED are mutually exclusive.
106 * PR_IMPLOPCL means that the protocol allows sendto without prior connect,
107 * and the protocol understands the MSG_EOF flag. The first property is
108 * is only relevant if PR_CONNREQUIRED is set (otherwise sendto is allowed
111 #define PR_ATOMIC 0x01 /* exchange atomic messages only */
112 #define PR_ADDR 0x02 /* addresses given with messages */
113 #define PR_CONNREQUIRED 0x04 /* connection required by protocol */
114 #define PR_WANTRCVD 0x08 /* want PRU_RCVD calls */
115 #define PR_RIGHTS 0x10 /* passes capabilities */
116 #define PR_IMPLOPCL 0x20 /* implied open/close */
117 #define PR_LASTHDR 0x40 /* enforce ipsec policy; last header */
120 * The arguments to usrreq are:
121 * (*protosw[].pr_usrreq)(up, req, m, nam, opt);
122 * where up is a (struct socket *), req is one of these requests,
123 * m is a optional mbuf chain containing a message,
124 * nam is an optional mbuf chain containing an address,
125 * and opt is a pointer to a socketopt structure or nil.
126 * The protocol is responsible for disposal of the mbuf chain m,
127 * the caller is responsible for any space held by nam and opt.
128 * A non-zero return from usrreq gives an
129 * UNIX error number which should be passed to higher level software.
131 #define PRU_ATTACH 0 /* attach protocol to up */
132 #define PRU_DETACH 1 /* detach protocol from up */
133 #define PRU_BIND 2 /* bind socket to address */
134 #define PRU_LISTEN 3 /* listen for connection */
135 #define PRU_CONNECT 4 /* establish connection to peer */
136 #define PRU_ACCEPT 5 /* accept connection from peer */
137 #define PRU_DISCONNECT 6 /* disconnect from peer */
138 #define PRU_SHUTDOWN 7 /* won't send any more data */
139 #define PRU_RCVD 8 /* have taken data; more room now */
140 #define PRU_SEND 9 /* send this data */
141 #define PRU_ABORT 10 /* abort (fast DISCONNECT, DETATCH) */
142 #define PRU_CONTROL 11 /* control operations on protocol */
143 #define PRU_SENSE 12 /* return status into m */
144 #define PRU_RCVOOB 13 /* retrieve out of band data */
145 #define PRU_SENDOOB 14 /* send out of band data */
146 #define PRU_SOCKADDR 15 /* fetch socket's address */
147 #define PRU_PEERADDR 16 /* fetch peer's address */
148 #define PRU_CONNECT2 17 /* connect two sockets */
149 /* begin for protocols internal use */
150 #define PRU_FASTTIMO 18 /* 200ms timeout */
151 #define PRU_SLOWTIMO 19 /* 500ms timeout */
152 #define PRU_PROTORCV 20 /* receive from below */
153 #define PRU_PROTOSEND 21 /* send to below */
154 /* end for protocol's internal use */
155 #define PRU_SEND_EOF 22 /* send and close */
159 char *prurequests[] = {
160 "ATTACH", "DETACH", "BIND", "LISTEN",
161 "CONNECT", "ACCEPT", "DISCONNECT", "SHUTDOWN",
162 "RCVD", "SEND", "ABORT", "CONTROL",
163 "SENSE", "RCVOOB", "SENDOOB", "SOCKADDR",
164 "PEERADDR", "CONNECT2", "FASTTIMO", "SLOWTIMO",
165 "PROTORCV", "PROTOSEND",
170 #ifdef _KERNEL /* users shouldn't see this decl */
178 * If the ordering here looks odd, that's because it's alphabetical.
179 * Having this structure separated out from the main protoswitch is allegedly
180 * a big (12 cycles per call) lose on high-end CPUs. We will eventually
181 * migrate this stuff back into the main structure.
184 int (*pru_abort) (struct socket *so);
185 int (*pru_accept) (struct socket *so, struct sockaddr **nam);
186 int (*pru_attach) (struct socket *so, int proto,
188 int (*pru_bind) (struct socket *so, struct sockaddr *nam,
190 int (*pru_connect) (struct socket *so, struct sockaddr *nam,
192 int (*pru_connect2) (struct socket *so1, struct socket *so2);
193 int (*pru_control) (struct socket *so, u_long cmd, caddr_t data,
194 struct ifnet *ifp, struct thread *td);
195 int (*pru_detach) (struct socket *so);
196 int (*pru_disconnect) (struct socket *so);
197 int (*pru_listen) (struct socket *so, struct thread *td);
198 int (*pru_peeraddr) (struct socket *so,
199 struct sockaddr **nam);
200 int (*pru_rcvd) (struct socket *so, int flags);
201 int (*pru_rcvoob) (struct socket *so, struct mbuf *m,
203 int (*pru_send) (struct socket *so, int flags, struct mbuf *m,
204 struct sockaddr *addr, struct mbuf *control,
208 #define PRUS_MORETOCOME 0x4
209 int (*pru_sense) (struct socket *so, struct stat *sb);
210 int (*pru_shutdown) (struct socket *so);
211 int (*pru_sockaddr) (struct socket *so,
212 struct sockaddr **nam);
215 * These three added later, so they are out of order. They are used
216 * for shortcutting (fast path input/output) in some protocols.
217 * XXX - that's a lie, they are not implemented yet
218 * Rather than calling sosend() etc. directly, calls are made
219 * through these entry points. For protocols which still use
220 * the generic code, these just point to those routines.
222 int (*pru_sosend) (struct socket *so, struct sockaddr *addr,
223 struct uio *uio, struct mbuf *top,
224 struct mbuf *control, int flags,
226 int (*pru_soreceive) (struct socket *so,
227 struct sockaddr **paddr,
228 struct uio *uio, struct mbuf **mp0,
229 struct mbuf **controlp, int *flagsp);
230 int (*pru_sopoll) (struct socket *so, int events,
231 struct ucred *cred, struct thread *td);
234 int pru_accept_notsupp (struct socket *so, struct sockaddr **nam);
235 int pru_connect_notsupp (struct socket *so, struct sockaddr *nam,
237 int pru_connect2_notsupp (struct socket *so1, struct socket *so2);
238 int pru_control_notsupp (struct socket *so, u_long cmd, caddr_t data,
239 struct ifnet *ifp, struct thread *td);
240 int pru_listen_notsupp (struct socket *so, struct thread *td);
241 int pru_rcvd_notsupp (struct socket *so, int flags);
242 int pru_rcvoob_notsupp (struct socket *so, struct mbuf *m, int flags);
243 int pru_sense_null (struct socket *so, struct stat *sb);
248 * The arguments to the ctlinput routine are
249 * (*protosw[].pr_ctlinput)(cmd, sa, arg);
250 * where cmd is one of the commands below, sa is a pointer to a sockaddr,
251 * and arg is a `void *' argument used within a protocol family.
253 #define PRC_IFDOWN 0 /* interface transition */
254 #define PRC_ROUTEDEAD 1 /* select new route if possible ??? */
255 #define PRC_IFUP 2 /* interface has come back up */
256 #define PRC_QUENCH2 3 /* DEC congestion bit says slow down */
257 #define PRC_QUENCH 4 /* some one said to slow down */
258 #define PRC_MSGSIZE 5 /* message size forced drop */
259 #define PRC_HOSTDEAD 6 /* host appears to be down */
260 #define PRC_HOSTUNREACH 7 /* deprecated (use PRC_UNREACH_HOST) */
261 #define PRC_UNREACH_NET 8 /* no route to network */
262 #define PRC_UNREACH_HOST 9 /* no route to host */
263 #define PRC_UNREACH_PROTOCOL 10 /* dst says bad protocol */
264 #define PRC_UNREACH_PORT 11 /* bad port # */
265 /* was PRC_UNREACH_NEEDFRAG 12 (use PRC_MSGSIZE) */
266 #define PRC_UNREACH_SRCFAIL 13 /* source route failed */
267 #define PRC_REDIRECT_NET 14 /* net routing redirect */
268 #define PRC_REDIRECT_HOST 15 /* host routing redirect */
269 #define PRC_REDIRECT_TOSNET 16 /* redirect for type of service & net */
270 #define PRC_REDIRECT_TOSHOST 17 /* redirect for tos & host */
271 #define PRC_TIMXCEED_INTRANS 18 /* packet lifetime expired in transit */
272 #define PRC_TIMXCEED_REASS 19 /* lifetime expired on reass q */
273 #define PRC_PARAMPROB 20 /* header incorrect */
274 #define PRC_UNREACH_ADMIN_PROHIB 21 /* packet administrativly prohibited */
278 #define PRC_IS_REDIRECT(cmd) \
279 ((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST)
282 char *prcrequests[] = {
283 "IFDOWN", "ROUTEDEAD", "IFUP", "DEC-BIT-QUENCH2",
284 "QUENCH", "MSGSIZE", "HOSTDEAD", "#7",
285 "NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",
286 "#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",
287 "TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",
288 "PARAMPROB", "ADMIN-UNREACH"
293 * The arguments to ctloutput are:
294 * (*protosw[].pr_ctloutput)(req, so, level, optname, optval, p);
295 * req is one of the actions listed below, so is a (struct socket *),
296 * level is an indication of which protocol layer the option is intended.
297 * optname is a protocol dependent socket option request,
298 * optval is a pointer to a mbuf-chain pointer, for value-return results.
299 * The protocol is responsible for disposal of the mbuf chain *optval
301 * the caller is responsible for any space held by *optval, when returned.
302 * A non-zero return from usrreq gives an
303 * UNIX error number which should be passed to higher level software.
305 #define PRCO_GETOPT 0
306 #define PRCO_SETOPT 1
311 char *prcorequests[] = {
317 void pfctlinput (int, struct sockaddr *);
318 void pfctlinput2 (int, struct sockaddr *, void *);
319 struct protosw *pffindproto (int family, int protocol, int type);
320 struct protosw *pffindtype (int family, int type);