10c252ba47
as necessary: * Implement a new mbuf utility routine, m_copyup(), is is like m_pullup(), except that it always prepends and copies, rather than only doing so if the desired length is larger than m->m_len. m_copyup() also allows an offset into the destination mbuf, which allows space for packet headers, in the forwarding case. * Add *_HDR_ALIGNED_P() macros for IP, IPv6, ICMP, and IGMP. These macros expand to 1 if __NO_STRICT_ALIGNMENT is defined, so that architectures which do not have strict alignment constraints don't pay for the test or visit the new align-if-needed path. * Use the new macros to check if a header needs to be aligned, or to assert that it already is, as appropriate. Note: This code is still somewhat experimental. However, the new code path won't be visited if individual device drivers continue to guarantee that packets are delivered to layer 3 already properly aligned (which are rules that are already in use).
107 lines
3.9 KiB
C
107 lines
3.9 KiB
C
/* $NetBSD: udp_var.h,v 1.19 2002/06/30 22:40:38 thorpej Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1989, 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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* @(#)udp_var.h 8.1 (Berkeley) 6/10/93
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*/
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#ifndef _NETINET_UDP_VAR_H_
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#define _NETINET_UDP_VAR_H_
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/*
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* UDP kernel structures and variables.
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*/
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struct udpiphdr {
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struct ipovly ui_i; /* overlaid ip structure */
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struct udphdr ui_u; /* udp header */
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} __attribute__((__packed__));
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#define ui_x1 ui_i.ih_x1
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#define ui_pr ui_i.ih_pr
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#define ui_len ui_i.ih_len
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#define ui_src ui_i.ih_src
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#define ui_dst ui_i.ih_dst
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#define ui_sport ui_u.uh_sport
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#define ui_dport ui_u.uh_dport
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#define ui_ulen ui_u.uh_ulen
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#define ui_sum ui_u.uh_sum
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struct udpstat {
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/* input statistics: */
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u_quad_t udps_ipackets; /* total input packets */
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u_quad_t udps_hdrops; /* packet shorter than header */
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u_quad_t udps_badsum; /* checksum error */
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u_quad_t udps_badlen; /* data length larger than packet */
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u_quad_t udps_noport; /* no socket on port */
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u_quad_t udps_noportbcast; /* of above, arrived as broadcast */
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u_quad_t udps_fullsock; /* not delivered, input socket full */
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u_quad_t udps_pcbhashmiss; /* input packets missing pcb hash */
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/* output statistics: */
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u_quad_t udps_opackets; /* total output packets */
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};
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/*
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* Names for UDP sysctl objects
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*/
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#define UDPCTL_CHECKSUM 1 /* checksum UDP packets */
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#define UDPCTL_SENDSPACE 2 /* default send buffer */
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#define UDPCTL_RECVSPACE 3 /* default recv buffer */
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#define UDPCTL_MAXID 4
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#define UDPCTL_NAMES { \
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{ 0, 0 }, \
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{ "checksum", CTLTYPE_INT }, \
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{ "sendspace", CTLTYPE_INT }, \
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{ "recvspace", CTLTYPE_INT }, \
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}
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#ifdef _KERNEL
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extern struct inpcbtable udbtable;
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extern struct udpstat udpstat;
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#ifdef __NO_STRICT_ALIGNMENT
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#define UDP_HDR_ALIGNED_P(uh) 1
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#else
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#define UDP_HDR_ALIGNED_P(uh) ((((vaddr_t) (uh)) & 3) == 0)
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#endif
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void *udp_ctlinput __P((int, struct sockaddr *, void *));
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void udp_init __P((void));
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void udp_input __P((struct mbuf *, ...));
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int udp_output __P((struct mbuf *, ...));
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int udp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
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int udp_usrreq __P((struct socket *,
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int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *));
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#endif
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#endif /* _NETINET_UDP_VAR_H_ */
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