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https://github.com/freebsd/freebsd-src
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60d8dbbef0
When debugging network issues one common clue is an unexpectedly
incrementing error counter. This is helpful, in that it gives us an
idea of what might be going wrong, but often these counters may be
incremented in different functions.
Add a static probe point for them so that we can use dtrace to get
futher information (e.g. a stack trace).
For example:
dtrace -n 'mib:ip:count: { printf("%d", arg0); stack(); }'
This can be disabled by setting the following kernel option:
options KDTRACE_NO_MIB_SDT
Reviewed by: gallatin, tuexen (previous version), gnn (previous version)
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D43504
193 lines
6.8 KiB
C
193 lines
6.8 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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#ifndef _NETINET_UDP_VAR_H_
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#define _NETINET_UDP_VAR_H_
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#include <sys/types.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.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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/*
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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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/* 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 <netinet/in_pcb.h>
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#include <sys/counter.h>
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#include <netinet/in_kdtrace.h>
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struct mbuf;
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typedef bool udp_tun_func_t(struct mbuf *, int, struct inpcb *,
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const struct sockaddr *, void *);
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typedef union {
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struct icmp *icmp;
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struct ip6ctlparam *ip6cp;
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} udp_tun_icmp_param_t __attribute__((__transparent_union__));
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typedef void udp_tun_icmp_t(udp_tun_icmp_param_t);
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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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struct inpcb u_inpcb;
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#define u_start_zero u_tun_func
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#define u_zero_size (sizeof(struct udpcb) - \
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offsetof(struct udpcb, u_start_zero))
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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) __containerof((inp), struct udpcb, u_inpcb)
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#define sotoudpcb(so) (intoudpcb(sotoinpcb(so)))
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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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do { \
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MIB_SDT_PROBE1(udp, count, name, (val)); \
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VNET_PCPUSTAT_ADD(struct udpstat, udpstat, name, (val)); \
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} while (0)
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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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do { \
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MIB_SDT_PROBE1(udp, count, name, 1); \
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kmod_udpstat_inc( \
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offsetof(struct udpstat, name) / sizeof(uint64_t)); \
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} while (0)
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SYSCTL_DECL(_net_inet_udp);
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VNET_DECLARE(struct inpcbinfo, udbinfo);
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VNET_DECLARE(struct inpcbinfo, ulitecbinfo);
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#define V_udbinfo VNET(udbinfo)
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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(bool, udp_blackhole_local);
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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_blackhole_local VNET(udp_blackhole_local)
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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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int udp_ctloutput(struct socket *, struct sockopt *);
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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 *, enum shutdown_how);
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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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#ifdef _SYS_PROTOSW_H_
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pr_abort_t udp_abort;
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pr_disconnect_t udp_disconnect;
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pr_send_t udp_send;
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#endif
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#endif /* _KERNEL */
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#endif /* _NETINET_UDP_VAR_H_ */
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