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field. This returns the sdl_data field to a variable-length field. More importantly, this prevents a easily-reproduceable data-corruption bug when the interface name plus the hardware address exceed the sdl_data field's original 12 byte limit. However, token-ring interfaces may still overflow the new sdl_data field's 46 byte limit if the interface name exceeds 6 characters (since 6 characters for interface name plus 6 for hardware address plus 34 for source routing = the size of sdl_data). Further refinements could overcome this limitation but would break binary compatibility; this commit only addresses fixing the bug for commonly-occuring cases without breaking binary compatibility with the intention that the functionality can be MFC'ed to -stable. See message ID's (both send to -arch): 20020421013332.F87395-100000@gateway.posi.net 20020430181359.G11009-300000@gateway.posi.net for a more thorough description of the bug addressed and how to reproduce it. Approved by: silence on -arch and -net Sponsored by: NTT Multimedia Communications Labs MFC after: 1 week
87 lines
3.5 KiB
C
87 lines
3.5 KiB
C
/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)if_dl.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _NET_IF_DL_H_
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#define _NET_IF_DL_H_
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/*
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* A Link-Level Sockaddr may specify the interface in one of two
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* ways: either by means of a system-provided index number (computed
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* anew and possibly differently on every reboot), or by a human-readable
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* string such as "il0" (for managerial convenience).
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*
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* Census taking actions, such as something akin to SIOCGCONF would return
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* both the index and the human name.
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*
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* High volume transactions (such as giving a link-level ``from'' address
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* in a recvfrom or recvmsg call) may be likely only to provide the indexed
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* form, (which requires fewer copy operations and less space).
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*
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* The form and interpretation of the link-level address is purely a matter
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* of convention between the device driver and its consumers; however, it is
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* expected that all drivers for an interface of a given if_type will agree.
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*/
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/*
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* Structure of a Link-Level sockaddr:
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*/
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struct sockaddr_dl {
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u_char sdl_len; /* Total length of sockaddr */
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u_char sdl_family; /* AF_LINK */
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u_short sdl_index; /* if != 0, system given index for interface */
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u_char sdl_type; /* interface type */
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u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
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u_char sdl_alen; /* link level address length */
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u_char sdl_slen; /* link layer selector length */
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char sdl_data[46]; /* minimum work area, can be larger;
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contains both if name and ll address */
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};
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#define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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void link_addr(const char *, struct sockaddr_dl *);
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char *link_ntoa(const struct sockaddr_dl *);
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__END_DECLS
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#endif /* !_KERNEL */
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#endif
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