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39 .Nd "network domain management"
46 .Fn domain_add "void *data"
48 .Fn pfctlinput "int cmd" "struct sockaddr *sa"
50 .Fn pffinddomain "int family"
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 void (*dom_destroy) /* cleanup structures / state */
72 int (*dom_externalize) /* externalize access rights */
73 (struct mbuf *, struct mbuf **);
74 void (*dom_dispose) /* dispose of internalized rights */
76 struct protosw *dom_protosw, *dom_protoswNPROTOSW;
77 struct domain *dom_next;
78 int (*dom_rtattach) /* initialize routing table */
80 int (*dom_rtdetach) /* clean up routing table */
82 void *(*dom_ifattach)(struct ifnet *);
83 void (*dom_ifdetach)(struct ifnet *, void *);
84 int (*dom_ifmtu)(struct ifnet *);
85 /* af-dependent data on ifnet */
89 Each domain contains an array of protocol switch structures
90 .Pq Vt "struct protosw *" ,
91 one for each socket type supported.
94 short pr_type; /* socket type used for */
95 struct domain *pr_domain; /* domain protocol a member of */
96 short pr_protocol; /* protocol number */
97 short pr_flags; /* see below */
98 /* protocol-protocol hooks */
99 pr_input_t *pr_input; /* input to protocol (from below) */
100 pr_output_t *pr_output; /* output to protocol (from above) */
101 pr_ctlinput_t *pr_ctlinput; /* control input (from below) */
102 pr_ctloutput_t *pr_ctloutput; /* control output (from above) */
105 pr_fasttimo_t *pr_fasttimo; /* fast timeout (200ms) */
106 pr_slowtimo_t *pr_slowtimo; /* slow timeout (500ms) */
107 pr_drain_t *pr_drain; /* flush any excess space possible */
109 struct pr_usrreqs *pr_usrreqs; /* user-protocol hook */
113 The following functions handle the registration of a new domain,
114 lookups of specific protocols and protocol types within those domains,
115 and handle control messages from the system.
118 is called by the system whenever an event occurs that could affect every
120 Examples of those types of events are routing table changes, interface
126 calls the protocol specific
128 function for each protocol in that has defined one, in every domain.
131 adds a new protocol domain to the system.
135 .Vt "struct domain *"
136 within the function, but is declared
138 in order to prevent compiler warnings when new domains are registered with
142 is not called directly, instead
146 If the new domain has defined an initialization routine, it is called by
148 as well, each of the protocols within the domain that have defined an
149 initialization routine will have theirs called.
151 Once a domain is added it cannot be unloaded.
152 This is because there is
153 no reference counting system in place to determine if there are any
154 active references from sockets within that domain.
157 finds a domain by family.
158 If the domain cannot be found,
165 look up a protocol by its number or by its type.
166 In most cases, if the protocol or type cannot be found,
170 may return the default if the requested type is
172 a protocol switch type of
174 is found, and the domain has a default raw protocol.
176 Both functions are called by
178 in order to resolve the protocol for the socket currently being created.
181 is a macro that simplifies the registration of a domain via
183 The code resulting from the macro expects there to be a domain structure
185 .Dq Fa name Ns Li domain
191 struct domain localdomain =
192 { AF_LOCAL, "local", unp_init, unp_externalize, unp_dispose,
193 localsw, &localsw[sizeof(localsw)/sizeof(localsw[0])] };
203 .Vt "struct protosw *"
204 for the protocol requested.
205 If the protocol or socket type is not found,
210 the default protocol may be returned for
212 types if the domain has a default raw protocol.
227 This manual page was written by
228 .An Chad David Aq Mt davidc@acns.ab.ca .