7790c8c199
Debugnet is a simplistic and specialized panic- or debug-time reliable datagram transport. It can drive a single connection at a time and is currently unidirectional (debug/panic machine transmit to remote server only). It is mostly a verbatim code lift from netdump(4). Netdump(4) remains the only consumer (until the rest of this patch series lands). The INET-specific logic has been extracted somewhat more thoroughly than previously in netdump(4), into debugnet_inet.c. UDP-layer logic and up, as much as possible as is protocol-independent, remains in debugnet.c. The separation is not perfect and future improvement is welcome. Supporting INET6 is a long-term goal. Much of the diff is "gratuitous" renaming from 'netdump_' or 'nd_' to 'debugnet_' or 'dn_' -- sorry. I thought keeping the netdump name on the generic module would be more confusing than the refactoring. The only functional change here is the mbuf allocation / tracking. Instead of initiating solely on netdump-configured interface(s) at dumpon(8) configuration time, we watch for any debugnet-enabled NIC for link activation and query it for mbuf parameters at that time. If they exceed the existing high-water mark allocation, we re-allocate and track the new high-water mark. Otherwise, we leave the pre-panic mbuf allocation alone. In a future patch in this series, this will allow initiating netdump from panic ddb(4) without pre-panic configuration. No other functional change intended. Reviewed by: markj (earlier version) Some discussion with: emaste, jhb Objection from: marius Differential Revision: https://reviews.freebsd.org/D21421
74 lines
2.7 KiB
C
74 lines
2.7 KiB
C
/*-
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* Copyright (c) 2005-2014 Sandvine Incorporated
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* Copyright (c) 2000 Darrell Anderson <anderson@cs.duke.edu>
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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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#ifndef _NETINET_NETDUMP_H_
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#define _NETINET_NETDUMP_H_
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#include <sys/types.h>
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#include <sys/disk.h>
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#include <sys/ioccom.h>
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#include <net/if.h>
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#include <netinet/in.h>
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/* Netdump wire protocol definitions are consumed by the ftp/netdumpd port. */
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#define NETDUMP_PORT 20023 /* Server UDP port for heralds. */
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#define NETDUMP_ACKPORT 20024 /* Client UDP port for acks. */
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#define NETDUMP_HERALD DEBUGNET_HERALD
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#define NETDUMP_FINISHED DEBUGNET_FINISHED
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#define NETDUMP_VMCORE DEBUGNET_DATA
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#define NETDUMP_KDH 4 /* Contains kernel dump header. */
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#define NETDUMP_EKCD_KEY 5 /* Contains kernel dump key. */
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#define NETDUMP_DATASIZE 4096 /* Arbitrary packet size limit. */
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/* For netdumpd. */
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#ifndef _KERNEL
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#define netdump_msg_hdr debugnet_msg_hdr
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#define mh__pad mh_aux2
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#define netdump_ack debugnet_ack
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#define na_seqno da_seqno
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#endif /* !_KERNEL */
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struct netdump_conf_freebsd12 {
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struct diocskerneldump_arg_freebsd12 ndc12_kda;
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char ndc12_iface[IFNAMSIZ];
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struct in_addr ndc12_server;
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struct in_addr ndc12_client;
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struct in_addr ndc12_gateway;
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};
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#define NETDUMPGCONF_FREEBSD12 _IOR('n', 1, struct netdump_conf_freebsd12)
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#define NETDUMPSCONF_FREEBSD12 _IOW('n', 2, struct netdump_conf_freebsd12)
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#define _PATH_NETDUMP "/dev/netdump"
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#endif /* _NETINET_NETDUMP_H_ */
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