72cc43df17
This will be used by some upcoming changes to if_vxlan(4). RFC 7348 (VXLAN) says that the UDP checksum "SHOULD be transmitted as zero. When a packet is received with a UDP checksum of zero, it MUST be accepted for decapsulation." But the original IPv6 RFCs did not allow zero UDP checksum. RFC 6935 attempts to resolve this. Reviewed by: kib@ Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D25873
191 lines
6.5 KiB
C
191 lines
6.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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.
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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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* 3. 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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* $FreeBSD$
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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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};
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#define ui_x1 ui_i.ih_x1
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#define ui_v ui_i.ih_x1[0]
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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 inpcb;
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struct mbuf;
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typedef void(*udp_tun_func_t)(struct mbuf *, int, struct inpcb *,
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const struct sockaddr *, void *);
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typedef void(*udp_tun_icmp_t)(int, struct sockaddr *, void *, void *);
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/*
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* UDP control block; one per udp.
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*/
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struct udpcb {
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udp_tun_func_t u_tun_func; /* UDP kernel tunneling callback. */
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udp_tun_icmp_t u_icmp_func; /* UDP kernel tunneling icmp callback */
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u_int u_flags; /* Generic UDP flags. */
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uint16_t u_rxcslen; /* Coverage for incoming datagrams. */
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uint16_t u_txcslen; /* Coverage for outgoing datagrams. */
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void *u_tun_ctx; /* Tunneling callback context. */
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};
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#define intoudpcb(ip) ((struct udpcb *)(ip)->inp_ppcb)
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#define sotoudpcb(so) (intoudpcb(sotoinpcb(so)))
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/* IPsec: ESP in UDP tunneling: */
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#define UF_ESPINUDP_NON_IKE 0x00000001 /* w/ non-IKE marker .. */
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/* .. per draft-ietf-ipsec-nat-t-ike-0[01],
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* and draft-ietf-ipsec-udp-encaps-(00/)01.txt */
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#define UF_ESPINUDP 0x00000002 /* w/ non-ESP marker. */
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struct udpstat {
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/* input statistics: */
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uint64_t udps_ipackets; /* total input packets */
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uint64_t udps_hdrops; /* packet shorter than header */
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uint64_t udps_badsum; /* checksum error */
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uint64_t udps_nosum; /* no checksum */
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uint64_t udps_badlen; /* data length larger than packet */
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uint64_t udps_noport; /* no socket on port */
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uint64_t udps_noportbcast; /* of above, arrived as broadcast */
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uint64_t udps_fullsock; /* not delivered, input socket full */
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uint64_t udpps_pcbcachemiss; /* input packets missing pcb cache */
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uint64_t udpps_pcbhashmiss; /* input packets not for hashed pcb */
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/* output statistics: */
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uint64_t udps_opackets; /* total output packets */
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uint64_t udps_fastout; /* output packets on fast path */
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/* of no socket on port, arrived as multicast */
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uint64_t udps_noportmcast;
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uint64_t udps_filtermcast; /* blocked by multicast filter */
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};
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#ifdef _KERNEL
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#include <sys/counter.h>
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VNET_PCPUSTAT_DECLARE(struct udpstat, udpstat);
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/*
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* In-kernel consumers can use these accessor macros directly to update
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* stats.
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*/
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#define UDPSTAT_ADD(name, val) \
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VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val))
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#define UDPSTAT_INC(name) UDPSTAT_ADD(name, 1)
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/*
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* Kernel module consumers must use this accessor macro.
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*/
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void kmod_udpstat_inc(int statnum);
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#define KMOD_UDPSTAT_INC(name) \
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kmod_udpstat_inc(offsetof(struct udpstat, name) / sizeof(uint64_t))
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#endif
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/*
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* Identifiers for UDP sysctl nodes.
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*/
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#define UDPCTL_CHECKSUM 1 /* checksum UDP packets */
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#define UDPCTL_STATS 2 /* statistics (read-only) */
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#define UDPCTL_MAXDGRAM 3 /* max datagram size */
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#define UDPCTL_RECVSPACE 4 /* default receive buffer space */
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#define UDPCTL_PCBLIST 5 /* list of PCBs for UDP sockets */
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#ifdef _KERNEL
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#include <netinet/in_pcb.h>
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SYSCTL_DECL(_net_inet_udp);
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extern struct pr_usrreqs udp_usrreqs;
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VNET_DECLARE(struct inpcbhead, udb);
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VNET_DECLARE(struct inpcbinfo, udbinfo);
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VNET_DECLARE(struct inpcbhead, ulitecb);
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VNET_DECLARE(struct inpcbinfo, ulitecbinfo);
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#define V_udb VNET(udb)
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#define V_udbinfo VNET(udbinfo)
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#define V_ulitecb VNET(ulitecb)
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#define V_ulitecbinfo VNET(ulitecbinfo)
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extern u_long udp_sendspace;
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extern u_long udp_recvspace;
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VNET_DECLARE(int, udp_cksum);
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VNET_DECLARE(int, udp_blackhole);
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VNET_DECLARE(int, udp_log_in_vain);
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#define V_udp_cksum VNET(udp_cksum)
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#define V_udp_blackhole VNET(udp_blackhole)
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#define V_udp_log_in_vain VNET(udp_log_in_vain)
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VNET_DECLARE(int, zero_checksum_port);
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#define V_zero_checksum_port VNET(zero_checksum_port)
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static __inline struct inpcbinfo *
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udp_get_inpcbinfo(int protocol)
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{
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return (protocol == IPPROTO_UDP) ? &V_udbinfo : &V_ulitecbinfo;
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}
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static __inline struct inpcbhead *
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udp_get_pcblist(int protocol)
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{
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return (protocol == IPPROTO_UDP) ? &V_udb : &V_ulitecb;
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}
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int udp_newudpcb(struct inpcb *);
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void udp_discardcb(struct udpcb *);
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void udp_ctlinput(int, struct sockaddr *, void *);
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void udplite_ctlinput(int, struct sockaddr *, void *);
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int udp_ctloutput(struct socket *, struct sockopt *);
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void udp_init(void);
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void udplite_init(void);
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int udp_input(struct mbuf **, int *, int);
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void udplite_input(struct mbuf *, int);
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struct inpcb *udp_notify(struct inpcb *inp, int errno);
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int udp_shutdown(struct socket *so);
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int udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f,
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udp_tun_icmp_t i, void *ctx);
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#endif /* _KERNEL */
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#endif /* _NETINET_UDP_VAR_H_ */
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