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33 * @(#)protosw.h 8.1 (Berkeley) 6/2/93
37 #ifndef _SYS_PROTOSW_H_
38 #define _SYS_PROTOSW_H_
41 * For pfil_head structure.
45 /* Forward declare these structures referenced from prototypes below. */
54 * Protocol switch table.
56 * Each protocol has a handle initializing one of these structures,
57 * which is used for protocol-protocol and system-protocol communication.
59 * A protocol is called through the pr_init entry before any other.
60 * Thereafter it is called every 200ms through the pr_fasttimo entry and
61 * every 500ms through the pr_slowtimo for timer based actions.
62 * The system will call the pr_drain entry if it is low on space and
63 * this should throw away any non-critical data.
65 * Protocols pass data between themselves as chains of mbufs using
66 * the pr_input and pr_output hooks. Pr_input passes data up (towards
67 * the users) and pr_output passes it down (towards the interfaces); control
68 * information passes up and down on pr_ctlinput and pr_ctloutput.
69 * The protocol is responsible for the space occupied by any the
70 * arguments to these entries and must dispose it.
72 * In retrospect, it would be a lot nicer to use an interface
73 * similar to the vnode VOP interface.
76 short pr_type; /* socket type used for */
77 struct domain *pr_domain; /* domain protocol a member of */
78 short pr_protocol; /* protocol number */
79 short pr_flags; /* see below */
80 /* protocol-protocol hooks */
81 void (*pr_input) __P((struct mbuf *, int len));
82 /* input to protocol (from below) */
83 int (*pr_output) __P((struct mbuf *m, struct socket *so));
84 /* output to protocol (from above) */
85 void (*pr_ctlinput)__P((int, struct sockaddr *, void *));
86 /* control input (from below) */
87 int (*pr_ctloutput)__P((struct socket *, struct sockopt *));
88 /* control output (from above) */
89 /* user-protocol hook */
92 void (*pr_init) __P((void)); /* initialization hook */
93 void (*pr_fasttimo) __P((void));
94 /* fast timeout (200ms) */
95 void (*pr_slowtimo) __P((void));
96 /* slow timeout (500ms) */
97 void (*pr_drain) __P((void));
98 /* flush any excess space possible */
99 struct pr_usrreqs *pr_usrreqs; /* supersedes pr_usrreq() */
100 struct pfil_head pr_pfh;
104 #define PR_SLOWHZ 2 /* 2 slow timeouts per second */
105 #define PR_FASTHZ 5 /* 5 fast timeouts per second */
108 * Values for pr_flags.
109 * PR_ADDR requires PR_ATOMIC;
110 * PR_ADDR and PR_CONNREQUIRED are mutually exclusive.
111 * PR_IMPLOPCL means that the protocol allows sendto without prior connect,
112 * and the protocol understands the MSG_EOF flag. The first property is
113 * is only relevant if PR_CONNREQUIRED is set (otherwise sendto is allowed
116 #define PR_ATOMIC 0x01 /* exchange atomic messages only */
117 #define PR_ADDR 0x02 /* addresses given with messages */
118 #define PR_CONNREQUIRED 0x04 /* connection required by protocol */
119 #define PR_WANTRCVD 0x08 /* want PRU_RCVD calls */
120 #define PR_RIGHTS 0x10 /* passes capabilities */
121 #define PR_IMPLOPCL 0x20 /* implied open/close */
124 * The arguments to usrreq are:
125 * (*protosw[].pr_usrreq)(up, req, m, nam, opt);
126 * where up is a (struct socket *), req is one of these requests,
127 * m is a optional mbuf chain containing a message,
128 * nam is an optional mbuf chain containing an address,
129 * and opt is a pointer to a socketopt structure or nil.
130 * The protocol is responsible for disposal of the mbuf chain m,
131 * the caller is responsible for any space held by nam and opt.
132 * A non-zero return from usrreq gives an
133 * UNIX error number which should be passed to higher level software.
135 #define PRU_ATTACH 0 /* attach protocol to up */
136 #define PRU_DETACH 1 /* detach protocol from up */
137 #define PRU_BIND 2 /* bind socket to address */
138 #define PRU_LISTEN 3 /* listen for connection */
139 #define PRU_CONNECT 4 /* establish connection to peer */
140 #define PRU_ACCEPT 5 /* accept connection from peer */
141 #define PRU_DISCONNECT 6 /* disconnect from peer */
142 #define PRU_SHUTDOWN 7 /* won't send any more data */
143 #define PRU_RCVD 8 /* have taken data; more room now */
144 #define PRU_SEND 9 /* send this data */
145 #define PRU_ABORT 10 /* abort (fast DISCONNECT, DETATCH) */
146 #define PRU_CONTROL 11 /* control operations on protocol */
147 #define PRU_SENSE 12 /* return status into m */
148 #define PRU_RCVOOB 13 /* retrieve out of band data */
149 #define PRU_SENDOOB 14 /* send out of band data */
150 #define PRU_SOCKADDR 15 /* fetch socket's address */
151 #define PRU_PEERADDR 16 /* fetch peer's address */
152 #define PRU_CONNECT2 17 /* connect two sockets */
153 /* begin for protocols internal use */
154 #define PRU_FASTTIMO 18 /* 200ms timeout */
155 #define PRU_SLOWTIMO 19 /* 500ms timeout */
156 #define PRU_PROTORCV 20 /* receive from below */
157 #define PRU_PROTOSEND 21 /* send to below */
158 /* end for protocol's internal use */
159 #define PRU_SEND_EOF 22 /* send and close */
163 char *prurequests[] = {
164 "ATTACH", "DETACH", "BIND", "LISTEN",
165 "CONNECT", "ACCEPT", "DISCONNECT", "SHUTDOWN",
166 "RCVD", "SEND", "ABORT", "CONTROL",
167 "SENSE", "RCVOOB", "SENDOOB", "SOCKADDR",
168 "PEERADDR", "CONNECT2", "FASTTIMO", "SLOWTIMO",
169 "PROTORCV", "PROTOSEND",
174 #ifdef _KERNEL /* users shouldn't see this decl */
182 * If the ordering here looks odd, that's because it's alphabetical.
183 * Having this structure separated out from the main protoswitch is allegedly
184 * a big (12 cycles per call) lose on high-end CPUs. We will eventually
185 * migrate this stuff back into the main structure.
188 int (*pru_abort) __P((struct socket *so));
189 int (*pru_accept) __P((struct socket *so, struct sockaddr **nam));
190 int (*pru_attach) __P((struct socket *so, int proto,
192 int (*pru_bind) __P((struct socket *so, struct sockaddr *nam,
194 int (*pru_connect) __P((struct socket *so, struct sockaddr *nam,
196 int (*pru_connect2) __P((struct socket *so1, struct socket *so2));
197 int (*pru_control) __P((struct socket *so, u_long cmd, caddr_t data,
198 struct ifnet *ifp, struct proc *p));
199 int (*pru_detach) __P((struct socket *so));
200 int (*pru_disconnect) __P((struct socket *so));
201 int (*pru_listen) __P((struct socket *so, struct proc *p));
202 int (*pru_peeraddr) __P((struct socket *so,
203 struct sockaddr **nam));
204 int (*pru_rcvd) __P((struct socket *so, int flags));
205 int (*pru_rcvoob) __P((struct socket *so, struct mbuf *m,
207 int (*pru_send) __P((struct socket *so, int flags, struct mbuf *m,
208 struct sockaddr *addr, struct mbuf *control,
212 #define PRUS_MORETOCOME 0x4
213 int (*pru_sense) __P((struct socket *so, struct stat *sb));
214 int (*pru_shutdown) __P((struct socket *so));
215 int (*pru_sockaddr) __P((struct socket *so,
216 struct sockaddr **nam));
219 * These three added later, so they are out of order. They are used
220 * for shortcutting (fast path input/output) in some protocols.
221 * XXX - that's a lie, they are not implemented yet
222 * Rather than calling sosend() etc. directly, calls are made
223 * through these entry points. For protocols which still use
224 * the generic code, these just point to those routines.
226 int (*pru_sosend) __P((struct socket *so, struct sockaddr *addr,
227 struct uio *uio, struct mbuf *top,
228 struct mbuf *control, int flags,
230 int (*pru_soreceive) __P((struct socket *so,
231 struct sockaddr **paddr,
232 struct uio *uio, struct mbuf **mp0,
233 struct mbuf **controlp, int *flagsp));
234 int (*pru_sopoll) __P((struct socket *so, int events,
235 struct ucred *cred, struct proc *p));
238 int pru_accept_notsupp __P((struct socket *so, struct sockaddr **nam));
239 int pru_connect_notsupp __P((struct socket *so, struct sockaddr *nam,
241 int pru_connect2_notsupp __P((struct socket *so1, struct socket *so2));
242 int pru_control_notsupp __P((struct socket *so, u_long cmd, caddr_t data,
243 struct ifnet *ifp, struct proc *p));
244 int pru_listen_notsupp __P((struct socket *so, struct proc *p));
245 int pru_rcvd_notsupp __P((struct socket *so, int flags));
246 int pru_rcvoob_notsupp __P((struct socket *so, struct mbuf *m, int flags));
247 int pru_sense_null __P((struct socket *so, struct stat *sb));
252 * The arguments to the ctlinput routine are
253 * (*protosw[].pr_ctlinput)(cmd, sa, arg);
254 * where cmd is one of the commands below, sa is a pointer to a sockaddr,
255 * and arg is a `void *' argument used within a protocol family.
257 #define PRC_IFDOWN 0 /* interface transition */
258 #define PRC_ROUTEDEAD 1 /* select new route if possible ??? */
259 #define PRC_IFUP 2 /* interface has come back up */
260 #define PRC_QUENCH2 3 /* DEC congestion bit says slow down */
261 #define PRC_QUENCH 4 /* some one said to slow down */
262 #define PRC_MSGSIZE 5 /* message size forced drop */
263 #define PRC_HOSTDEAD 6 /* host appears to be down */
264 #define PRC_HOSTUNREACH 7 /* deprecated (use PRC_UNREACH_HOST) */
265 #define PRC_UNREACH_NET 8 /* no route to network */
266 #define PRC_UNREACH_HOST 9 /* no route to host */
267 #define PRC_UNREACH_PROTOCOL 10 /* dst says bad protocol */
268 #define PRC_UNREACH_PORT 11 /* bad port # */
269 /* was PRC_UNREACH_NEEDFRAG 12 (use PRC_MSGSIZE) */
270 #define PRC_UNREACH_SRCFAIL 13 /* source route failed */
271 #define PRC_REDIRECT_NET 14 /* net routing redirect */
272 #define PRC_REDIRECT_HOST 15 /* host routing redirect */
273 #define PRC_REDIRECT_TOSNET 16 /* redirect for type of service & net */
274 #define PRC_REDIRECT_TOSHOST 17 /* redirect for tos & host */
275 #define PRC_TIMXCEED_INTRANS 18 /* packet lifetime expired in transit */
276 #define PRC_TIMXCEED_REASS 19 /* lifetime expired on reass q */
277 #define PRC_PARAMPROB 20 /* header incorrect */
278 #define PRC_UNREACH_ADMIN_PROHIB 21 /* packet administrativly prohibited */
282 #define PRC_IS_REDIRECT(cmd) \
283 ((cmd) >= PRC_REDIRECT_NET && (cmd) <= PRC_REDIRECT_TOSHOST)
286 char *prcrequests[] = {
287 "IFDOWN", "ROUTEDEAD", "IFUP", "DEC-BIT-QUENCH2",
288 "QUENCH", "MSGSIZE", "HOSTDEAD", "#7",
289 "NET-UNREACH", "HOST-UNREACH", "PROTO-UNREACH", "PORT-UNREACH",
290 "#12", "SRCFAIL-UNREACH", "NET-REDIRECT", "HOST-REDIRECT",
291 "TOSNET-REDIRECT", "TOSHOST-REDIRECT", "TX-INTRANS", "TX-REASS",
292 "PARAMPROB", "ADMIN-UNREACH"
297 * The arguments to ctloutput are:
298 * (*protosw[].pr_ctloutput)(req, so, level, optname, optval, p);
299 * req is one of the actions listed below, so is a (struct socket *),
300 * level is an indication of which protocol layer the option is intended.
301 * optname is a protocol dependent socket option request,
302 * optval is a pointer to a mbuf-chain pointer, for value-return results.
303 * The protocol is responsible for disposal of the mbuf chain *optval
305 * the caller is responsible for any space held by *optval, when returned.
306 * A non-zero return from usrreq gives an
307 * UNIX error number which should be passed to higher level software.
309 #define PRCO_GETOPT 0
310 #define PRCO_SETOPT 1
315 char *prcorequests[] = {
321 void pfctlinput __P((int, struct sockaddr *));
322 struct protosw *pffindproto __P((int family, int protocol, int type));
323 struct protosw *pffindtype __P((int family, int type));