uipc_accf.c revision 61837
161837Salfred/*- 261837Salfred * Copyright (c) 2000 Alfred Perlstein <alfred@FreeBSD.org> 361837Salfred * All rights reserved. 461837Salfred * 561837Salfred * Redistribution and use in source and binary forms, with or without 661837Salfred * modification, are permitted provided that the following conditions 761837Salfred * are met: 861837Salfred * 1. Redistributions of source code must retain the above copyright 961837Salfred * notice, this list of conditions and the following disclaimer. 1061837Salfred * 2. Redistributions in binary form must reproduce the above copyright 1161837Salfred * notice, this list of conditions and the following disclaimer in the 1261837Salfred * documentation and/or other materials provided with the distribution. 1361837Salfred * 1461837Salfred * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1561837Salfred * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1661837Salfred * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1761837Salfred * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1861837Salfred * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1961837Salfred * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2061837Salfred * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2161837Salfred * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2261837Salfred * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2361837Salfred * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2461837Salfred * SUCH DAMAGE. 2561837Salfred * 2661837Salfred * $FreeBSD: head/sys/kern/uipc_accf.c 61837 2000-06-20 01:09:23Z alfred $ 2761837Salfred */ 2861837Salfred 2961837Salfred#define ACCEPT_FILTER_MOD 3061837Salfred 3161837Salfred#include "opt_param.h" 3261837Salfred#include <sys/param.h> 3361837Salfred#include <sys/systm.h> 3461837Salfred#include <sys/domain.h> 3561837Salfred#include <sys/kernel.h> 3661837Salfred#include <sys/proc.h> 3761837Salfred#include <sys/malloc.h> 3861837Salfred#include <sys/mbuf.h> 3961837Salfred#include <sys/protosw.h> 4061837Salfred#include <sys/socket.h> 4161837Salfred#include <sys/socketvar.h> 4261837Salfred#include <sys/queue.h> 4361837Salfred 4461837Salfredstatic SLIST_HEAD(, accept_filter) accept_filtlsthd = 4561837Salfred SLIST_HEAD_INITIALIZER(&accept_filtlsthd); 4661837Salfred 4761837SalfredMALLOC_DEFINE(M_ACCF, "accf", "accept filter data"); 4861837Salfred 4961837Salfred/* 5061837Salfred * must be passed a malloc'd structure so we don't explode if the kld 5161837Salfred * is unloaded, we leak the struct on deallocation to deal with this, 5261837Salfred * but if a filter is loaded with the same name as a leaked one we re-use 5361837Salfred * the entry. 5461837Salfred */ 5561837Salfredint 5661837Salfredaccept_filt_add(struct accept_filter *filt) 5761837Salfred{ 5861837Salfred struct accept_filter *p; 5961837Salfred 6061837Salfred SLIST_FOREACH(p, &accept_filtlsthd, accf_next) 6161837Salfred if (strcmp(p->accf_name, filt->accf_name) == 0) { 6261837Salfred if (p->accf_callback != NULL) { 6361837Salfred return (EEXIST); 6461837Salfred } else { 6561837Salfred p->accf_callback = filt->accf_callback; 6661837Salfred FREE(filt, M_ACCF); 6761837Salfred return (0); 6861837Salfred } 6961837Salfred } 7061837Salfred 7161837Salfred if (p == NULL) 7261837Salfred SLIST_INSERT_HEAD(&accept_filtlsthd, filt, accf_next); 7361837Salfred return (0); 7461837Salfred} 7561837Salfred 7661837Salfredint 7761837Salfredaccept_filt_del(char *name) 7861837Salfred{ 7961837Salfred struct accept_filter *p; 8061837Salfred 8161837Salfred p = accept_filt_get(name); 8261837Salfred if (p == NULL) 8361837Salfred return (ENOENT); 8461837Salfred 8561837Salfred p->accf_callback = NULL; 8661837Salfred return (0); 8761837Salfred} 8861837Salfred 8961837Salfredstruct accept_filter * 9061837Salfredaccept_filt_get(char *name) 9161837Salfred{ 9261837Salfred struct accept_filter *p; 9361837Salfred 9461837Salfred SLIST_FOREACH(p, &accept_filtlsthd, accf_next) 9561837Salfred if (strcmp(p->accf_name, name) == 0) 9661837Salfred return (p); 9761837Salfred 9861837Salfred return (NULL); 9961837Salfred} 10061837Salfred 10161837Salfredint 10261837Salfredaccept_filt_generic_mod_event(module_t mod, int event, void *data) 10361837Salfred{ 10461837Salfred struct accept_filter *p; 10561837Salfred struct accept_filter *accfp = (struct accept_filter *) data; 10661837Salfred int s, error; 10761837Salfred 10861837Salfred switch (event) { 10961837Salfred case MOD_LOAD: 11061837Salfred MALLOC(p, struct accept_filter *, sizeof(*p), M_ACCF, M_WAITOK); 11161837Salfred bcopy(accfp, p, sizeof(*p)); 11261837Salfred s = splnet(); 11361837Salfred error = accept_filt_add(p); 11461837Salfred splx(s); 11561837Salfred break; 11661837Salfred 11761837Salfred case MOD_UNLOAD: 11861837Salfred s = splnet(); 11961837Salfred error = accept_filt_del(accfp->accf_name); 12061837Salfred splx(s); 12161837Salfred break; 12261837Salfred 12361837Salfred case MOD_SHUTDOWN: 12461837Salfred error = 0; 12561837Salfred break; 12661837Salfred 12761837Salfred default: 12861837Salfred error = EOPNOTSUPP; 12961837Salfred break; 13061837Salfred } 13161837Salfred 13261837Salfred return (error); 13361837Salfred} 134