/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009 - 2013 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#ifndef DISSECTOR_H
#define DISSECTOR_H

#include <stdlib.h>
#include <stdint.h>
#include <sys/socket.h>
#include <linux/if_packet.h>
#include <linux/if.h>

#include "ring.h"
#include "tprintf.h"
#include "pcap_io.h"
#include "built_in.h"

#define PRINT_NORM		0
#define PRINT_LESS		1
#define PRINT_HEX		2
#define PRINT_ASCII		3
#define PRINT_HEX_ASCII		4
#define PRINT_NONE		5

extern char *if_indextoname(unsigned ifindex, char *ifname);

static const char * const packet_types[256] = {
	[PACKET_HOST]		=	"<", /* Incoming */
	[PACKET_BROADCAST]	=	"B", /* Broadcast */
	[PACKET_MULTICAST]	=	"M", /* Multicast */
	[PACKET_OTHERHOST]	=	"P", /* Promisc */
	[PACKET_OUTGOING]	=	">", /* Outgoing */
					"?", /* Unknown */
};

static inline const char *__show_ts_source(uint32_t status)
{
	if (status & TP_STATUS_TS_RAW_HARDWARE)
		return "(raw hw ts)";
	else if (status & TP_STATUS_TS_SYS_HARDWARE)
		return "(sys hw ts)";
	else if (status & TP_STATUS_TS_SOFTWARE)
		return "(sw ts)";
	else
		return "";
}

static inline void __show_frame_hdr(struct sockaddr_ll *s_ll,
				    void *raw, int mode, bool v3)
{
	char tmp[IFNAMSIZ];
	union tpacket_uhdr hdr;

	if (mode == PRINT_NONE)
		return;

	hdr.raw = raw;
	switch (mode) {
	case PRINT_LESS:
		tprintf("%s %s %u",
			packet_types[s_ll->sll_pkttype] ? : "?",
			if_indextoname(s_ll->sll_ifindex, tmp) ? : "?",
			v3 ? hdr.h3->tp_len : hdr.h2->tp_len);
		break;
	default:
		tprintf("%s %s %u %us.%uns %s\n",
			packet_types[s_ll->sll_pkttype] ? : "?",
			if_indextoname(s_ll->sll_ifindex, tmp) ? : "?",
			v3 ? hdr.h3->tp_len : hdr.h2->tp_len,
			v3 ? hdr.h3->tp_sec : hdr.h2->tp_sec,
			v3 ? hdr.h3->tp_nsec : hdr.h2->tp_nsec,
			v3 ? "" : __show_ts_source(hdr.h2->tp_status));
		break;
	}
}

static inline void show_frame_hdr(struct frame_map *hdr, int mode)
{
	__show_frame_hdr(&hdr->s_ll, &hdr->tp_h, mode, false);
}

extern void dissector_init_all(int fnttype);
extern void dissector_entry_point(uint8_t *packet, size_t len, int linktype, int mode);
extern void dissector_cleanup_all(void);
extern int dissector_set_print_type(void *ptr, int type);

#endif /* DISSECTOR_H */
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/diff/?id=1a0bee6c1e788218fd1d141db320db970aace7f0'>root</a>/<a href='/cgit.cgi/linux/net-next.git/diff/drivers?id=1a0bee6c1e788218fd1d141db320db970aace7f0'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb?id=1a0bee6c1e788218fd1d141db320db970aace7f0'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/storage?id=1a0bee6c1e788218fd1d141db320db970aace7f0'>storage</a>/<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/storage/Kconfig?id=1a0bee6c1e788218fd1d141db320db970aace7f0'>Kconfig</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='1a0bee6c1e788218fd1d141db320db970aace7f0'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1a0bee6c1e788218fd1d141db320db970aace7f0'>Diffstat</a> (limited to 'drivers/usb/storage/Kconfig')</div><table summary='diffstat' class='diffstat'>it.cgi/linux/net-next.git/commit/arch/arm64/kernel?id=1c5b51dfb7b4564008e0cadec5381a69e88b0d21'>1c5b51dfb7b4564008e0cadec5381a69e88b0d21</a> (<a href='/cgit.cgi/linux/net-next.git/patch/arch/arm64/kernel?id=1c5b51dfb7b4564008e0cadec5381a69e88b0d21'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/arch/arm64/kernel?id=91cb163e4d141c74e99639fbee7c2a6332c92901'>91cb163e4d141c74e99639fbee7c2a6332c92901</a> (<a href='/cgit.cgi/linux/net-next.git/diff/arch/arm64/kernel?id=1c5b51dfb7b4564008e0cadec5381a69e88b0d21&amp;id2=91cb163e4d141c74e99639fbee7c2a6332c92901'>diff</a>)</td></tr></table>
<div class='commit-subject'>arm64: swp emulation: bound LL/SC retries before rescheduling</div><div class='commit-msg'>If a CPU does not implement a global monitor for certain memory types,
then userspace can attempt a kernel DoS by issuing SWP instructions
targetting the problematic memory (for example, a framebuffer mapped
with non-cacheable attributes).

The SWP emulation code protects against these sorts of attacks by
checking for pending signals and potentially rescheduling when the STXR
instruction fails during the emulation. Whilst this is good for avoiding
livelock, it harms emulation of legitimate SWP instructions on CPUs
where forward progress is not guaranteed if there are memory accesses to
the same reservation granule (up to 2k) between the failing STXR and
the retry of the LDXR.

This patch solves the problem by retrying the STXR a bounded number of
times (4) before breaking out of the LL/SC loop and looking for
something else to do.

Cc: &lt;stable@vger.kernel.org&gt;
Fixes: bd35a4adc413 ("arm64: Port SWP/SWPB emulation support from arm")
Reviewed-by: Mark Rutland &lt;mark.rutland@arm.com&gt;
Signed-off-by: Will Deacon &lt;will.deacon@arm.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1c5b51dfb7b4564008e0cadec5381a69e88b0d21'>Diffstat</a> (limited to 'arch/arm64/kernel')</div><table summary='diffstat' class='diffstat'>