/*
 * netsniff-ng - the packet sniffing beast
 * Subject to the GPL, version 2.
 */

#include "oui.h"
#include "protos.h"
#include "pcap_io.h"
#include "pkt_buff.h"
#include "dissector.h"
#include "dissector_sll.h"
#include "dissector_eth.h"

static char *pkt_type2str(uint8_t pkttype)
{
	switch (pkttype) {
	case PACKET_HOST:
		return "host";
	case PACKET_BROADCAST:
		return "broadcast";
	case PACKET_MULTICAST:
		return "multicast";
	case PACKET_OTHERHOST:
		return "other host";
	case PACKET_OUTGOING:
		return "outgoing";
	case PACKET_USER:
		return "user";
	case PACKET_KERNEL:
		return "kernel";
	}

	return "Unknown";
}

static void sll_print_full(struct pkt_buff *pkt)
{
	struct sockaddr_ll *sll = pkt->sll;
	char addr_str[40] = {};

	if (!pkt || !sll)
		return;

	tprintf(" [ Linux \"cooked\"");
	tprintf(" Pkt Type %d (%s)", sll->sll_pkttype,
			pkt_type2str(sll->sll_pkttype));
	tprintf(", If Type %d (%s)", sll->sll_hatype,
			device_type2str(sll->sll_hatype));
	tprintf(", Addr Len %d", sll->sll_halen);
	tprintf(", Src (%s)", device_addr2str(sll->sll_addr, sll->sll_halen,
			sll->sll_hatype, addr_str, sizeof(addr_str)));
	tprintf(", Proto 0x%x", ntohs(sll->sll_protocol));
	tprintf(" ]\n");

	switch (pcap_devtype_to_linktype(sll->sll_hatype)) {
	case LINKTYPE_EN10MB:
	case ___constant_swab32(LINKTYPE_EN10MB):
		pkt_set_dissector(pkt, &eth_lay2, ntohs(sll->sll_protocol));
		break;
	case LINKTYPE_NETLINK:
	case ___constant_swab32(LINKTYPE_NETLINK):
		pkt->dissector = &nlmsg_ops;
		break;
	default:
		tprintf(" [ Uknown protocol ]\n");
	}
}

static void sll_print_less(struct pkt_buff *pkt)
{
	struct sockaddr_ll *sll = pkt->sll;
	char addr_str[40] = {};

	if (!pkt || !sll)
		return;

	tprintf(" Pkt Type %d (%s)", sll->sll_pkttype,
			pkt_type2str(sll->sll_pkttype));
	tprintf(", If Type %d (%s)", sll->sll_hatype,
			device_type2str(sll->sll_hatype));
	tprintf(", Addr Len %d", sll->sll_halen);
	tprintf(", Src (%s)", device_addr2str(sll->sll_addr, sll->sll_halen,
			sll->sll_hatype, addr_str, sizeof(addr_str)));
	tprintf(", Proto 0x%x", ntohs(sll->sll_protocol));
}

struct protocol sll_ops = {
	.key = 0,
	.print_full = sll_print_full,
	.print_less = sll_print_less,
};

struct protocol *dissector_get_sll_entry_point(void)
{
	return &sll_ops;
}

struct protocol *dissector_get_sll_exit_point(void)
{
	return &none_ops;
}

void dissector_init_sll(int fnttype)
{
	dissector_set_print_type(&sll_ops, fnttype);
	dissector_set_print_type(&none_ops, fnttype);
	dissector_init_oui();
}

void dissector_cleanup_sll(void)
{
	dissector_cleanup_oui();
}
ption value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='ce4f06dcbb5d6d04d202f1b81ac72d5679dcdfc0'/><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><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Oleg Nesterov &lt;oleg@redhat.com&gt;</td><td class='right'>2016-07-26 20:57:36 +0200</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2016-07-27 11:12:11 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=ce4f06dcbb5d6d04d202f1b81ac72d5679dcdfc0'>ce4f06dcbb5d6d04d202f1b81ac72d5679dcdfc0</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=ce4f06dcbb5d6d04d202f1b81ac72d5679dcdfc0'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=ce4f06dcbb5d6d04d202f1b81ac72d5679dcdfc0'>5f7b351d9cfc0374eeacc3c1034fd7effd5bd9ff</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=5cada17426505b09a045cd9e6d7fb6db19b76ea1'>5cada17426505b09a045cd9e6d7fb6db19b76ea1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=ce4f06dcbb5d6d04d202f1b81ac72d5679dcdfc0&amp;id2=5cada17426505b09a045cd9e6d7fb6db19b76ea1'>diff</a>)</td></tr></table>
<div class='commit-subject'>stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE</div><div class='commit-msg'>Suppose that stop_machine(fn) hangs because fn() hangs. In this case NMI
hard-lockup can be triggered on another CPU which does nothing wrong and
the trace from nmi_panic() won't help to investigate the problem.

And this change "fixes" the problem we (seem to) hit in practice.

 - stop_two_cpus(0, 1) races with show_state_filter() running on CPU_0.

 - CPU_1 already spins in MULTI_STOP_PREPARE state, it detects the soft
   lockup and tries to report the problem.

 - show_state_filter() enables preemption, CPU_0 calls multi_cpu_stop()
   which goes to MULTI_STOP_DISABLE_IRQ state and disables interrupts.

 - CPU_1 spends more than 10 seconds trying to flush the log buffer to
   the slow serial console.

 - NMI interrupt on CPU_0 (which now waits for CPU_1) calls nmi_panic().

Reported-by: Wang Shu &lt;shuwang@redhat.com&gt;
Signed-off-by: Oleg Nesterov &lt;oleg@redhat.com&gt;
Reviewed-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Cc: Dave Anderson &lt;anderson@redhat.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Paul E. McKenney &lt;paulmck@linux.vnet.ibm.com&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Tejun Heo &lt;tj@kernel.org&gt;
Link: http://lkml.kernel.org/r/20160726185736.GB4088@redhat.com
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=ce4f06dcbb5d6d04d202f1b81ac72d5679dcdfc0'>Diffstat</a></div><table summary='diffstat' class='diffstat'>