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39 .Nd "network domain management"
46 .Fn net_add_domain "void *data"
48 .Fn pfctlinput "int cmd" "struct sockaddr *sa"
50 .Fn pfctlinput2 "int cmd" "struct sockaddr *sa" "void *ctlparam"
52 .Fn pffindproto "int family" "int protocol" "int type"
54 .Fn pffindtype "int family" "int type"
58 Network protocols installed in the system are maintained within what
66 int dom_family; /* AF_xxx */
68 void (*dom_init) /* initialize domain data structures */
70 int (*dom_externalize) /* externalize access rights */
71 (struct mbuf *, struct mbuf **);
72 void (*dom_dispose) /* dispose of internalized rights */
74 struct protosw *dom_protosw, *dom_protoswNPROTOSW;
75 struct domain *dom_next;
76 int (*dom_rtattach) /* initialize routing table */
78 int dom_rtoffset; /* an arg to rtattach, in bits */
79 int dom_maxrtkey; /* for routing layer */
83 Each domain contains an array of protocol switch structures
84 .Pq Vt "struct protosw *" ,
85 one for each socket type supported.
88 short pr_type; /* socket type used for */
89 struct domain *pr_domain; /* domain protocol a member of */
90 short pr_protocol; /* protocol number */
91 short pr_flags; /* see below */
92 /* protocol-protocol hooks */
93 pr_input_t *pr_input; /* input to protocol (from below) */
94 pr_output_t *pr_output; /* output to protocol (from above) */
95 pr_ctlinput_t *pr_ctlinput; /* control input (from below) */
96 pr_ctloutput_t *pr_ctloutput; /* control output (from above) */
97 /* user-protocol hook */
98 pr_usrreq_t *pr_ousrreq;
101 pr_fasttimo_t *pr_fasttimo; /* fast timeout (200ms) */
102 pr_slowtimo_t *pr_slowtimo; /* slow timeout (500ms) */
103 pr_drain_t *pr_drain; /* flush any excess space possible */
105 struct pr_usrreqs *pr_usrreqs; /* supersedes pr_usrreq() */
106 struct pfil_head pr_pfh;
110 The following functions handle the registration of a new domain,
111 lookups of specific protocols and protocol types within those domains,
112 and handle control messages from the system.
115 is called by the system whenever an event occurs that could affect every
117 Examples of those types of events are routing table changes, interface
123 calls the protocol specific
125 function for each protocol in that has defined one, in every domain.
128 provides that same functionality of
130 but with a few additional checks and a new
132 argument that is passed directly to the protocol's
142 and that only the protocol families that are the same as
149 adds a new protocol domain to the system.
153 .Vt "struct domain *"
154 within the function, but is declared
156 in order to prevent compiler warnings when new domains are registered with
160 is not called directly, instead
164 If the new domain has defined an initialization routine, it is called by
166 as well, each of the protocols within the domain that have defined an
167 initialization routine will have theirs called.
169 Once a domain is added it cannot be unloaded.
170 This is because there is
171 no reference counting system in place to determine if there are any
172 active references from sockets within that domain.
177 look up a protocol by its number or by its type.
178 In most cases, if the protocol or type cannot be found,
182 may return the default if the requested type is
184 a protocol switch type of
186 is found, and the domain has a default raw protocol.
188 Both functions are called by
190 in order to resolve the protocol for the socket currently being created.
193 is a macro that simplifies the registration of a domain via
195 The code resulting from the macro expects there to be a domain structure
197 .Dq Fa name Ns Li domain
203 struct domain localdomain =
204 { AF_LOCAL, "local", unp_init, unp_externalize, unp_dispose,
205 localsw, &localsw[sizeof(localsw)/sizeof(localsw[0])] };
215 .Vt "struct protosw *"
216 for the protocol requested.
217 If the protocol or socket type is not found,
222 the default protocol may be returned for
224 types if the domain has a default raw protocol.
228 This manual page was written by
229 .An Chad David Aq davidc@acns.ab.ca .