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40 .Nd "network domain management"
47 .Fn domain_add "void *data"
49 .Fn pfctlinput "int cmd" "struct sockaddr *sa"
51 .Fn pfctlinput2 "int cmd" "struct sockaddr *sa" "void *ctlparam"
53 .Fn pffinddomain "int family"
55 .Fn pffindproto "int family" "int protocol" "int type"
57 .Fn pffindtype "int family" "int type"
61 Network protocols installed in the system are maintained within what
69 int dom_family; /* AF_xxx */
71 void (*dom_init) /* initialize domain data structures */
73 void (*dom_destroy) /* cleanup structures / state */
75 int (*dom_externalize) /* externalize access rights */
76 (struct mbuf *, struct mbuf **);
77 void (*dom_dispose) /* dispose of internalized rights */
79 struct protosw *dom_protosw, *dom_protoswNPROTOSW;
80 struct domain *dom_next;
81 int (*dom_rtattach) /* initialize routing table */
83 int (*dom_rtdetach) /* clean up routing table */
85 void *(*dom_ifattach)(struct ifnet *);
86 void (*dom_ifdetach)(struct ifnet *, void *);
87 int (*dom_ifmtu)(struct ifnet *);
88 /* af-dependent data on ifnet */
92 Each domain contains an array of protocol switch structures
93 .Pq Vt "struct protosw *" ,
94 one for each socket type supported.
97 short pr_type; /* socket type used for */
98 struct domain *pr_domain; /* domain protocol a member of */
99 short pr_protocol; /* protocol number */
100 short pr_flags; /* see below */
101 /* protocol-protocol hooks */
102 pr_input_t *pr_input; /* input to protocol (from below) */
103 pr_output_t *pr_output; /* output to protocol (from above) */
104 pr_ctlinput_t *pr_ctlinput; /* control input (from below) */
105 pr_ctloutput_t *pr_ctloutput; /* control output (from above) */
108 pr_destroy_t *pr_destroy;
109 pr_fasttimo_t *pr_fasttimo; /* fast timeout (200ms) */
110 pr_slowtimo_t *pr_slowtimo; /* slow timeout (500ms) */
111 pr_drain_t *pr_drain; /* flush any excess space possible */
113 struct pr_usrreqs *pr_usrreqs; /* user-protocol hook */
117 The following functions handle the registration of a new domain,
118 lookups of specific protocols and protocol types within those domains,
119 and handle control messages from the system.
122 is called by the system whenever an event occurs that could affect every
124 Examples of those types of events are routing table changes, interface
130 calls the protocol specific
132 function for each protocol in that has defined one, in every domain.
135 provides that same functionality of
137 but with a few additional checks and a new
139 argument that is passed directly to the protocol's
149 and that only the protocol families that are the same as
156 adds a new protocol domain to the system.
160 .Vt "struct domain *"
161 within the function, but is declared
163 in order to prevent compiler warnings when new domains are registered with
167 is not called directly, instead
171 If the new domain has defined an initialization routine, it is called by
173 as well, each of the protocols within the domain that have defined an
174 initialization routine will have theirs called.
176 Once a domain is added it cannot be unloaded.
177 This is because there is
178 no reference counting system in place to determine if there are any
179 active references from sockets within that domain.
182 finds a domain by family.
183 If the domain cannot be found,
190 look up a protocol by its number or by its type.
191 In most cases, if the protocol or type cannot be found,
195 may return the default if the requested type is
197 a protocol switch type of
199 is found, and the domain has a default raw protocol.
201 Both functions are called by
203 in order to resolve the protocol for the socket currently being created.
206 is a macro that simplifies the registration of a domain via
208 The code resulting from the macro expects there to be a domain structure
210 .Dq Fa name Ns Li domain
216 struct domain localdomain =
217 { AF_LOCAL, "local", unp_init, unp_externalize, unp_dispose,
218 localsw, &localsw[sizeof(localsw)/sizeof(localsw[0])] };
228 .Vt "struct protosw *"
229 for the protocol requested.
230 If the protocol or socket type is not found,
235 the default protocol may be returned for
237 types if the domain has a default raw protocol.
241 This manual page was written by
242 .An Chad David Aq Mt davidc@acns.ab.ca .