/*
 * netsniff-ng - the packet sniffing beast
 * Copyright (C) 2009, 2010 Daniel Borkmann
 * Copyright (C) 2012 Christoph Jaeger <christoph@netsniff-ng.org>
 * Subject to the GPL, version 2.
 */

#include <stdio.h>
#include <stdint.h>
#include <netinet/in.h>    /* for ntohs() */
#include <arpa/inet.h>     /* for inet_ntop() */

#include "proto.h"
#include "protos.h"
#include "csum.h"
#include "dissector_eth.h"
#include "ipv4.h"
#include "geoip.h"
#include "pkt_buff.h"
#include "built_in.h"

#define FRAG_OFF_RESERVED_FLAG(x)      ((x) & 0x8000)
#define FRAG_OFF_NO_FRAGMENT_FLAG(x)   ((x) & 0x4000)
#define FRAG_OFF_MORE_FRAGMENT_FLAG(x) ((x) & 0x2000)
#define FRAG_OFF_FRAGMENT_OFFSET(x)    ((x) & 0x1fff)

/* IP Option Numbers (http://www.iana.org/assignments/ip-parameters) */
#define IP_OPT_EOOL 0x00
#define IP_OPT_NOP  0x01

#define IP_OPT_COPIED_FLAG(x)  ((x) & 0x80)
#define IP_OPT_CLASS(x)       (((x) & 0x60) >> 5)
#define IP_OPT_NUMBER(x)       ((x) & 0x1F)

static void ipv4(struct pkt_buff *pkt)
{
	uint16_t csum, frag_off, h_tot_len;
	char src_ip[INET_ADDRSTRLEN];
	char dst_ip[INET_ADDRSTRLEN];
	struct ipv4hdr *ip = (struct ipv4hdr *) pkt_pull(pkt, sizeof(*ip));
	uint8_t *opt, *trailer;
	unsigned int trailer_len = 0;
	ssize_t opts_len, opt_len;
	struct sockaddr_in sas, sad;
	const char *city, *region, *country;

	if (!ip)
		return;

	frag_off = ntohs(ip->h_frag_off);
	h_tot_len = ntohs(ip->h_tot_len);
	csum = calc_csum(ip, ip->h_ihl * 4, 0);

	inet_ntop(AF_INET, &ip->h_saddr, src_ip, sizeof(src_ip));
	inet_ntop(AF_INET, &ip->h_daddr, dst_ip, sizeof(dst_ip));

	if ((pkt_len(pkt) + sizeof(*ip)) > h_tot_len) {
		trailer_len = pkt_len(pkt) + sizeof(*ip) - h_tot_len;
		trailer = pkt->data + h_tot_len + trailer_len;
	}

	if (trailer_len) {
		 tprintf(" [ Eth trailer ");
		 while (trailer_len--) {
			tprintf("%x", *(trailer - trailer_len));
		 }
		 tprintf(" ]\n");
	}

	tprintf(" [ IPv4 ");
	tprintf("Addr (%s => %s), ", src_ip, dst_ip);
	tprintf("Proto (%u), ", ip->h_protocol);
	tprintf("TTL (%u), ", ip->h_ttl);
	tprintf("TOS (%u), ", ip->h_tos);
	tprintf("Ver (%u), ", ip->h_version);
	tprintf("IHL (%u), ", ip->h_ihl);
	tprintf("Tlen (%u), ", ntohs(ip->h_tot_len));
	tprintf("ID (%u), ", ntohs(ip->h_id));
	tprintf("Res (%u), NoFrag (%u), MoreFrag (%u), FragOff (%u), ",
		FRAG_OFF_RESERVED_FLAG(frag_off) ? 1 : 0,
		FRAG_OFF_NO_FRAGMENT_FLAG(frag_off) ? 1 : 0,
		FRAG_OFF_MORE_FRAGMENT_FLAG(frag_off) ? 1 : 0,
		FRAG_OFF_FRAGMENT_OFFSET(frag_off));
	tprintf("CSum (0x%.4x) is %s", ntohs(ip->h_check),
		csum ? colorize_start_full(black, red) "bogus (!)"
		       colorize_end() : "ok");
	if (csum)
		tprintf("%s should be 0x%.4x%s", colorize_start_full(black, red),
			csum_expected(ip->h_check, csum), colorize_end());
	tprintf(" ]\n");

	memset(&sas, 0, sizeof(sas));
	sas.sin_family = PF_INET;
	sas.sin_addr.s_addr = ip->h_saddr;

	memset(&sad, 0, sizeof(sad));
	sad.sin_family = PF_INET;
	sad.sin_addr.s_addr = ip->h_daddr;

	if (geoip_working()) {
		tprintf("\t[ Geo (");
		if ((country = geoip4_country_name(sas))) {
			tprintf("%s", country);
			if ((region = geoip4_region_name(sas)))
				tprintf(" / %s", region);
			if ((city = geoip4_city_name(sas)))
				tprintf(" / %s", city);
		} else {
			tprintf("local");
		}
		tprintf(" => ");
		if ((country = geoip4_country_name(sad))) {
			tprintf("%s", country);
			if ((region = geoip4_region_name(sad)))
				tprintf(" / %s", region);
			if ((city = geoip4_city_name(sad)))
				tprintf(" / %s", city);
		} else {
			tprintf("local");
		}
		tprintf(") ]\n");
	}

	opts_len = max((uint8_t) ip->h_ihl, sizeof(*ip) / sizeof(uint32_t)) *
		   sizeof(uint32_t) - sizeof(*ip);

	for (opt = pkt_pull(pkt, opts_len); opt && opts_len > 0; opt++) {
		tprintf("   [ Option  Copied (%u), Class (%u), Number (%u)",
			IP_OPT_COPIED_FLAG(*opt) ? 1 : 0, IP_OPT_CLASS(*opt),
			IP_OPT_NUMBER(*opt));

		switch (*opt) {
		case IP_OPT_EOOL:
		case IP_OPT_NOP:
			tprintf(" ]\n");
			opts_len--;
			break;
		default:
			/*
			 * Assuming that EOOL and NOP are the only single-byte
			 * options, treat all other options as variable in
			 * length with a minimum of 2.
			 *
			 * TODO: option length might be incorrect in malformed packets,
			 *       check and handle that
			 */
			opt_len = *(++opt);
			if (opt_len > opts_len) {
				tprintf(", Len (%zd, invalid) ]\n", opt_len);
				goto out;
			} else
				tprintf(", Len (%zd) ]\n", opt_len);
			opts_len -= opt_len;
			tprintf("     [ Data hex ");
			for (opt_len -= 2; opt_len > 0; opt_len--)
				tprintf(" %.2x", *(++opt));
			tprintf(" ]\n");
			break;
		}
	}
out:
	/* cut off everything that is not part of IPv4 payload */
	/* XXX there could still be an Ethernet trailer included or others */

	pkt_trim(pkt, pkt_len(pkt) - min(pkt_len(pkt),
		 (ntohs(ip->h_tot_len) - ip->h_ihl * sizeof(uint32_t))));

	pkt_set_proto(pkt, &eth_lay3, ip->h_protocol);
}

static void ipv4_less(struct pkt_buff *pkt)
{
	char src_ip[INET_ADDRSTRLEN];
	char dst_ip[INET_ADDRSTRLEN];
	struct ipv4hdr *ip = (struct ipv4hdr *) pkt_pull(pkt, sizeof(*ip));

	if (!ip)
		return;

	inet_ntop(AF_INET, &ip->h_saddr, src_ip, sizeof(src_ip));
	inet_ntop(AF_INET, &ip->h_daddr, dst_ip, sizeof(dst_ip));

	tprintf(" %s/%s Len %u", src_ip, dst_ip,
		ntohs(ip->h_tot_len));

	/* cut off IP options and everything that is not part of IPv4 payload */
	pkt_pull(pkt, max((uint8_t) ip->h_ihl, sizeof(*ip) / sizeof(uint32_t))
		* sizeof(uint32_t) - sizeof(*ip));
	/* XXX there coul still be an Ethernet trailer included or others */
#if 0
	pkt_trim(pkt, pkt_len(pkt) - min(pkt_len(pkt),
		 (ntohs(ip->h_tot_len) - ip->h_ihl * sizeof(uint32_t))));
#endif
	pkt_set_proto(pkt, &eth_lay3, ip->h_protocol);
}

struct protocol ipv4_ops = {
	.key = 0x0800,
	.print_full = ipv4,
	.print_less = ipv4_less,
};
n?h=nds-private-remove&amp;id=e3f948cd3283e4fbe5907f1f3967c839912f480e&amp;id2=07d9a380680d1c0eb51ef87ff2eab5c994949e69'>diff</a>)</td></tr></table>
<div class='commit-subject'>RAID1: ignore discard error</div><div class='commit-msg'>If a write error occurs, raid1 will try to rewrite the bio in small
chunk size. If the rewrite fails, raid1 will record the error in bad
block. narrow_write_error will always use WRITE for the bio, but
actually it could be a discard. Since discard bio hasn't payload, write
the bio will cause different issues. But discard error isn't fatal, we
can safely ignore it. This is what this patch does.

This issue should exist since discard is added, but only exposed with
recent arbitrary bio size feature.

Reported-and-tested-by: Sitsofe Wheeler &lt;sitsofe@gmail.com&gt;
Cc: stable@vger.kernel.org (v3.6)
Signed-off-by: Shaohua Li &lt;shli@fb.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=e3f948cd3283e4fbe5907f1f3967c839912f480e'>Diffstat</a> (limited to 'Documentation')</div><table summary='diffstat' class='diffstat'>