34c538c356
Plenty of allocation sites pass M_ZERO and sizes which are small and known at compilation time. Handling them internally in malloc loses this information and results in avoidable calls to memset. Instead, let the compiler take the advantage of it whenever possible. Discussed with: jeff
151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Alias_mod.h defines the outside world interfaces for the packet aliasing
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* modular framework
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*/
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#ifndef _ALIAS_MOD_H_
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#define _ALIAS_MOD_H_
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#ifdef _KERNEL
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MALLOC_DECLARE(M_ALIAS);
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/* Use kernel allocator. */
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#if defined(_SYS_MALLOC_H_)
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#undef malloc
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#define malloc(x) malloc(x, M_ALIAS, M_NOWAIT|M_ZERO)
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#define calloc(n, x) mallocarray((n), (x), M_ALIAS, M_NOWAIT|M_ZERO)
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#define free(x) free(x, M_ALIAS)
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#endif
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#endif
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/* Packet flow direction flags. */
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#define IN 0x0001
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#define OUT 0x0002
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#define NODIR 0x4000
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/* Working protocol flags. */
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#define IP 0x01
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#define TCP 0x02
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#define UDP 0x04
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/*
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* Data passed to protocol handler module, it must be filled
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* right before calling find_handler() to determine which
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* module is elegible to be called.
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*/
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struct alias_data {
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struct alias_link *lnk;
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struct in_addr *oaddr; /* Original address. */
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struct in_addr *aaddr; /* Alias address. */
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uint16_t *aport; /* Alias port. */
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uint16_t *sport, *dport; /* Source & destination port */
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uint16_t maxpktsize; /* Max packet size. */
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};
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/*
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* This structure contains all the information necessary to make
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* a protocol handler correctly work.
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*/
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struct proto_handler {
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u_int pri; /* Handler priority. */
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int16_t dir; /* Flow direction. */
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uint8_t proto; /* Working protocol. */
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/* Fingerprint * function. */
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int (*fingerprint)(struct libalias *, struct alias_data *);
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/* Aliasing * function. */
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int (*protohandler)(struct libalias *, struct ip *,
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struct alias_data *);
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TAILQ_ENTRY(proto_handler) link;
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};
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/* End of handlers. */
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#define EOH .dir = NODIR
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/* Functions used with protocol handlers. */
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int LibAliasAttachHandlers(struct proto_handler *);
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int LibAliasDetachHandlers(struct proto_handler *);
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int find_handler(int8_t, int8_t, struct libalias *, struct ip *,
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struct alias_data *);
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struct proto_handler *first_handler(void);
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#ifndef _KERNEL
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/*
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* Used only in userland when libalias needs to keep track of all
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* module loaded. In kernel land (kld mode) we don't need to care
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* care about libalias modules cause it's kld to do it for us.
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*/
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#define DLL_LEN 32
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struct dll {
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char name[DLL_LEN]; /* Name of module. */
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void *handle; /*
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* Ptr to shared obj obtained through
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* dlopen() - use this ptr to get access
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* to any symbols from a loaded module
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* via dlsym().
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*/
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SLIST_ENTRY(dll) next;
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};
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/* Functions used with dll module. */
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void dll_chain_init(void);
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void dll_chain_destroy(void);
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int attach_dll(struct dll *);
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void *detach_dll(char *);
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struct dll *walk_dll_chain(void);
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/*
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* Some defines borrowed from sys/module.h used to compile a kld
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* in userland as a shared lib.
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*/
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typedef enum modeventtype {
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MOD_LOAD,
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MOD_UNLOAD,
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MOD_SHUTDOWN,
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MOD_QUIESCE
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} modeventtype_t;
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typedef struct module *module_t;
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typedef int (*modeventhand_t)(module_t, int /* modeventtype_t */, void *);
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/*
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* Struct for registering modules statically via SYSINIT.
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*/
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typedef struct moduledata {
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const char *name; /* module name */
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modeventhand_t evhand; /* event handler */
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void *priv; /* extra data */
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} moduledata_t;
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#endif /* !_KERNEL */
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#endif /* !_ALIAS_MOD_H_ */
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