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NAME

net_add_domain

 
pfctlinput

 
pfctlinput2

 
pffindproto

 
pffindtype

 
DOMAIN_SET

 - network domain management

 

SYNOPSIS

DESCRIPTION

struct domain {
        int     dom_family;             /* AF_xxx */
        char    *dom_name;
        void    (*dom_init)             /* initialize domain data structures */
                (void);
        int     (*dom_externalize)      /* externalize access rights */
                (struct mbuf *, struct mbuf **);
        void    (*dom_dispose)          /* dispose of internalized rights */
                (struct mbuf *);
        struct  protosw *dom_protosw, *dom_protoswNPROTOSW;
        struct  domain *dom_next;
        int     (*dom_rtattach)         /* initialize routing table */
                (void **, int);
        int     dom_rtoffset;           /* an arg to rtattach, in bits */
        int     dom_maxrtkey;           /* for routing layer */
};

Each domain contains an array of protocol switch structures (Vt struct protosw * ) one for each socket type supported.

struct protosw {
        short   pr_type;                /* socket type used for */
        struct  domain *pr_domain;      /* domain protocol a member of */
        short   pr_protocol;            /* protocol number */
        short   pr_flags;               /* see below */
/* protocol-protocol hooks */
        pr_input_t *pr_input;           /* input to protocol (from below) */
        pr_output_t *pr_output;         /* output to protocol (from above) */
        pr_ctlinput_t *pr_ctlinput;     /* control input (from below) */
        pr_ctloutput_t *pr_ctloutput;   /* control output (from above) */
/* user-protocol hook */
        pr_usrreq_t     *pr_ousrreq;
/* utility hooks */
        pr_init_t *pr_init;
        pr_fasttimo_t *pr_fasttimo;     /* fast timeout (200ms) */
        pr_slowtimo_t *pr_slowtimo;     /* slow timeout (500ms) */
        pr_drain_t *pr_drain;           /* flush any excess space possible */

        struct  pr_usrreqs *pr_usrreqs; /* supersedes pr_usrreq() */
        struct  pfil_head       pr_pfh;
};

The following functions handle the registration of a new domain, lookups of specific protocols and protocol types within those domains, and handle control messages from the system.

pfctlinput ();
is called by the system whenever an event occurs that could affect every domain. Examples of those types of events are routing table changes, interface shutdowns or certain ICMP message types. When called, pfctlinput ();
calls the protocol specific pr_ctlinput ();
function for each protocol in that has defined one, in every domain.

pfctlinput2 ();
provides that same functionality of pfctlinput (,);
but with a few additional checks and a new Vt void * argument that is passed directly to the protocol's pr_ctlinput ();
function. Unlike pfctlinput (,);
pfctlinput2 ();
verifies that Fa sa is not NULL and that only the protocol families that are the same as Fa sa have their pr_ctlinput ();
function called.

net_add_domain ();
adds a new protocol domain to the system. The argument Fa data is cast directly to Vt struct domain * within the function, but is declared Vt void * in order to prevent compiler warnings when new domains are registered with SYSINIT (.);
In most cases net_add_domain ();
is not called directly, instead DOMAIN_SET ();
is used.

If the new domain has defined an initialization routine, it is called by net_add_domain (;);
as well, each of the protocols within the domain that have defined an initialization routine will have theirs called.

Once a domain is added it cannot be unloaded. This is because there is no reference counting system in place to determine if there are any active references from sockets within that domain.

pffindtype ();
and pffindproto ();
look up a protocol by its number or by its type. In most cases, if the protocol or type cannot be found, NULL is returned, but pffindproto ();
may return the default if the requested type is SOCK_RAW a protocol switch type of SOCK_RAW is found, and the domain has a default raw protocol.

Both functions are called by socreate ();
in order to resolve the protocol for the socket currently being created.

DOMAIN_SET ();
is a macro that simplifies the registration of a domain via SYSINIT (.);
The code resulting from the macro expects there to be a domain structure named ``Fa name domain '' where Fa name is the argument to DOMAIN_SET (:);

struct domain localdomain =
{ AF_LOCAL, "local", unp_init, unp_externalize, unp_dispose,
  localsw, &localsw[sizeof(localsw)/sizeof(localsw[0])] };

DOMAIN_SET(local);

RETURN VALUES

SEE ALSO

AUTHORS

Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUES

SEE ALSO

AUTHORS

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