[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / xt_HMARK.c

/*
 * xt_HMARK - Netfilter module to set mark by means of hashing
 *
 * (C) 2012 by Hans Schillstrom <hans.schillstrom@ericsson.com>
 * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/icmp.h>

#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_HMARK.h>

#include <net/ip.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack.h>
#endif
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
#include <net/ipv6.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#endif

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Hans Schillstrom <hans.schillstrom@ericsson.com>");
MODULE_DESCRIPTION("Xtables: packet marking using hash calculation");
MODULE_ALIAS("ipt_HMARK");
MODULE_ALIAS("ip6t_HMARK");

struct hmark_tuple {
	__be32			src;
	__be32			dst;
	union hmark_ports	uports;
	u8			proto;
};

static inline __be32 hmark_addr6_mask(const __be32 *addr32, const __be32 *mask)
{
	return (addr32[0] & mask[0]) ^
	       (addr32[1] & mask[1]) ^
	       (addr32[2] & mask[2]) ^
	       (addr32[3] & mask[3]);
}

static inline __be32
hmark_addr_mask(int l3num, const __be32 *addr32, const __be32 *mask)
{
	switch (l3num) {
	case AF_INET:
		return *addr32 & *mask;
	case AF_INET6:
		return hmark_addr6_mask(addr32, mask);
	}
	return 0;
}

static inline void hmark_swap_ports(union hmark_ports *uports,
				    const struct xt_hmark_info *info)
{
	union hmark_ports hp;
	u16 src, dst;

	hp.b32 = (uports->b32 & info->port_mask.b32) | info->port_set.b32;
	src = ntohs(hp.b16.src);
	dst = ntohs(hp.b16.dst);

	if (dst > src)
		uports->v32 = (dst << 16) | src;
	else
		uports->v32 = (src << 16) | dst;
}

static int
hmark_ct_set_htuple(const struct sk_buff *skb, struct hmark_tuple *t,
		    const struct xt_hmark_info *info)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
	enum ip_conntrack_info ctinfo;
	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
	struct nf_conntrack_tuple *otuple;
	struct nf_conntrack_tuple *rtuple;

	if (ct == NULL || nf_ct_is_untracked(ct))
		return -1;

	otuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
	rtuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;

	t->src = hmark_addr_mask(otuple->src.l3num, otuple->src.u3.ip6,
				 info->src_mask.ip6);
	t->dst = hmark_addr_mask(otuple->src.l3num, rtuple->src.u3.ip6,
				 info->dst_mask.ip6);

	if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
		return 0;

	t->proto = nf_ct_protonum(ct);
	if (t->proto != IPPROTO_ICMP) {
		t->uports.b16.src = otuple->src.u.all;
		t->uports.b16.dst = rtuple->src.u.all;
		hmark_swap_ports(&t->uports, info);
	}

	return 0;
#else
	return -1;
#endif
}

/* This hash function is endian independent, to ensure consistent hashing if
 * the cluster is composed of big and little endian systems. */
static inline u32
hmark_hash(struct hmark_tuple *t, const struct xt_hmark_info *info)
{
	u32 hash;
	u32 src = ntohl(t->src);
	u32 dst = ntohl(t->dst);

	if (dst < src)
		swap(src, dst);

	hash = jhash_3words(src, dst, t->uports.v32, info->hashrnd);
	hash = hash ^ (t->proto & info->proto_mask);

	return (((u64)hash * info->hmodulus) >> 32) + info->hoffset;
}

static void
hmark_set_tuple_ports(const struct sk_buff *skb, unsigned int nhoff,
		      struct hmark_tuple *t, const struct xt_hmark_info *info)
{
	int protoff;

	protoff = proto_ports_offset(t->proto);
	if (protoff < 0)
		return;

	nhoff += protoff;
	if (skb_copy_bits(skb, nhoff, &t->uports, sizeof(t->uports)) < 0)
		return;

	hmark_swap_ports(&t->uports, info);
}

#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
static int get_inner6_hdr(const struct sk_buff *skb, int *offset)
{
	struct icmp6hdr *icmp6h, _ih6;

	icmp6h = skb_header_pointer(skb, *offset, sizeof(_ih6), &_ih6);
	if (icmp6h == NULL)
		return 0;

	if (icmp6h->icmp6_type && icmp6h->icmp6_type < 128) {
		*offset += sizeof(struct icmp6hdr);
		return 1;
	}
	return 0;
}

static int
hmark_pkt_set_htuple_ipv6(const struct sk_buff *skb, struct hmark_tuple *t,
			  const struct xt_hmark_info *info)
{
	struct ipv6hdr *ip6, _ip6;
	int flag = IP6_FH_F_AUTH;
	unsigned int nhoff = 0;
	u16 fragoff = 0;
	int nexthdr;

	ip6 = (struct ipv6hdr *) (skb->data + skb_network_offset(skb));
	nexthdr = ipv6_find_hdr(skb, &nhoff, -1, &fragoff, &flag);
	if (nexthdr < 0)
		return 0;
	/* No need to check for icmp errors on fragments */
	if ((flag & IP6_FH_F_FRAG) || (nexthdr != IPPROTO_ICMPV6))
		goto noicmp;
	/* Use inner header in case of ICMP errors */
	if (get_inner6_hdr(skb, &nhoff)) {
		ip6 = skb_header_pointer(skb, nhoff, sizeof(_ip6), &_ip6);
		if (ip6 == NULL)
			return -1;
		/* If AH present, use SPI like in ESP. */
		flag = IP6_FH_F_AUTH;
		nexthdr = ipv6_find_hdr(skb, &nhoff, -1, &fragoff, &flag);
		if (nexthdr < 0)
			return -1;
	}
noicmp:
	t->src = hmark_addr6_mask(ip6->saddr.s6_addr32, info->src_mask.ip6);
	t->dst = hmark_addr6_mask(ip6->daddr.s6_addr32, info->dst_mask.ip6);

	if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
		return 0;

	t->proto = nexthdr;
	if (t->proto == IPPROTO_ICMPV6)
		return 0;

	if (flag & IP6_FH_F_FRAG)
		return 0;

	hmark_set_tuple_ports(skb, nhoff, t, info);
	return 0;
}

static unsigned int
hmark_tg_v6(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_hmark_info *info = par->targinfo;
	struct hmark_tuple t;

	memset(&t, 0, sizeof(struct hmark_tuple));

	if (info->flags & XT_HMARK_FLAG(XT_HMARK_CT)) {
		if (hmark_ct_set_htuple(skb, &t, info) < 0)
			return XT_CONTINUE;
	} else {
		if (hmark_pkt_set_htuple_ipv6(skb, &t, info) < 0)
			return XT_CONTINUE;
	}

	skb->mark = hmark_hash(&t, info);
	return XT_CONTINUE;
}
#endif

static int get_inner_hdr(const struct sk_buff *skb, int iphsz, int *nhoff)
{
	const struct icmphdr *icmph;
	struct icmphdr _ih;

	/* Not enough header? */
	icmph = skb_header_pointer(skb, *nhoff + iphsz, sizeof(_ih), &_ih);
	if (icmph == NULL || icmph->type > NR_ICMP_TYPES)
		return 0;

	/* Error message? */
	if (icmph->type != ICMP_DEST_UNREACH &&
	    icmph->type != ICMP_SOURCE_QUENCH &&
	    icmph->type != ICMP_TIME_EXCEEDED &&
	    icmph->type != ICMP_PARAMETERPROB &&
	    icmph->type != ICMP_REDIRECT)
		return 0;

	*nhoff += iphsz + sizeof(_ih);
	return 1;
}

static int
hmark_pkt_set_htuple_ipv4(const struct sk_buff *skb, struct hmark_tuple *t,
			  const struct xt_hmark_info *info)
{
	struct iphdr *ip, _ip;
	int nhoff = skb_network_offset(skb);

	ip = (struct iphdr *) (skb->data + nhoff);
	if (ip->protocol == IPPROTO_ICMP) {
		/* Use inner header in case of ICMP errors */
		if (get_inner_hdr(skb, ip->ihl * 4, &nhoff)) {
			ip = skb_header_pointer(skb, nhoff, sizeof(_ip), &_ip);
			if (ip == NULL)
				return -1;
		}
	}

	t->src = ip->saddr & info->src_mask.ip;
	t->dst = ip->daddr & info->dst_mask.ip;

	if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
		return 0;

	t->proto = ip->protocol;

	/* ICMP has no ports, skip */
	if (t->proto == IPPROTO_ICMP)
		return 0;

	/* follow-up fragments don't contain ports, skip all fragments */
	if (ip->frag_off & htons(IP_MF | IP_OFFSET))
		return 0;

	hmark_set_tuple_ports(skb, (ip->ihl * 4) + nhoff, t, info);

	return 0;
}

static unsigned int
hmark_tg_v4(struct sk_buff *skb, const struct xt_action_param *par)
{
	const struct xt_hmark_info *info = par->targinfo;
	struct hmark_tuple t;

	memset(&t, 0, sizeof(struct hmark_tuple));

	if (info->flags & XT_HMARK_FLAG(XT_HMARK_CT)) {
		if (hmark_ct_set_htuple(skb, &t, info) < 0)
			return XT_CONTINUE;
	} else {
		if (hmark_pkt_set_htuple_ipv4(skb, &t, info) < 0)
			return XT_CONTINUE;
	}

	skb->mark = hmark_hash(&t, info);
	return XT_CONTINUE;
}

static int hmark_tg_check(const struct xt_tgchk_param *par)
{
	const struct xt_hmark_info *info = par->targinfo;

	if (!info->hmodulus) {
		pr_info("xt_HMARK: hash modulus can't be zero\n");
		return -EINVAL;
	}
	if (info->proto_mask &&
	    (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))) {
		pr_info("xt_HMARK: proto mask must be zero with L3 mode\n");
		return -EINVAL;
	}
	if (info->flags & XT_HMARK_FLAG(XT_HMARK_SPI_MASK) &&
	    (info->flags & (XT_HMARK_FLAG(XT_HMARK_SPORT_MASK) |
			     XT_HMARK_FLAG(XT_HMARK_DPORT_MASK)))) {
		pr_info("xt_HMARK: spi-mask and port-mask can't be combined\n");
		return -EINVAL;
	}
	if (info->flags & XT_HMARK_FLAG(XT_HMARK_SPI) &&
	    (info->flags & (XT_HMARK_FLAG(XT_HMARK_SPORT) |
			     XT_HMARK_FLAG(XT_HMARK_DPORT)))) {
		pr_info("xt_HMARK: spi-set and port-set can't be combined\n");
		return -EINVAL;
	}
	return 0;
}

static struct xt_target hmark_tg_reg[] __read_mostly = {
	{
		.name		= "HMARK",
		.family		= NFPROTO_IPV4,
		.target		= hmark_tg_v4,
		.targetsize	= sizeof(struct xt_hmark_info),
		.checkentry	= hmark_tg_check,
		.me		= THIS_MODULE,
	},
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
	{
		.name		= "HMARK",
		.family		= NFPROTO_IPV6,
		.target		= hmark_tg_v6,
		.targetsize	= sizeof(struct xt_hmark_info),
		.checkentry	= hmark_tg_check,
		.me		= THIS_MODULE,
	},
#endif
};

static int __init hmark_tg_init(void)
{
	return xt_register_targets(hmark_tg_reg, ARRAY_SIZE(hmark_tg_reg));
}

static void __exit hmark_tg_exit(void)
{
	xt_unregister_targets(hmark_tg_reg, ARRAY_SIZE(hmark_tg_reg));
}

module_init(hmark_tg_init);
module_exit(hmark_tg_exit);
Commit	Line	Data
cf308a1f HS	1	/*
	2	* xt_HMARK - Netfilter module to set mark by means of hashing
	3	*
	4	* (C) 2012 by Hans Schillstrom <hans.schillstrom@ericsson.com>
	5	* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2 as published by
	9	* the Free Software Foundation.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/icmp.h>
	15
	16	#include <linux/netfilter/x_tables.h>
	17	#include <linux/netfilter/xt_HMARK.h>
	18
	19	#include <net/ip.h>
	20	#if IS_ENABLED(CONFIG_NF_CONNTRACK)
	21	#include <net/netfilter/nf_conntrack.h>
	22	#endif
	23	#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
	24	#include <net/ipv6.h>
	25	#include <linux/netfilter_ipv6/ip6_tables.h>
	26	#endif
	27
	28	MODULE_LICENSE("GPL");
	29	MODULE_AUTHOR("Hans Schillstrom <hans.schillstrom@ericsson.com>");
	30	MODULE_DESCRIPTION("Xtables: packet marking using hash calculation");
	31	MODULE_ALIAS("ipt_HMARK");
	32	MODULE_ALIAS("ip6t_HMARK");
	33
	34	struct hmark_tuple {
d1992b16 HS	35	__be32 src;
d1992b16 HS	36	__be32 dst;
cf308a1f	37	union hmark_ports uports;
d1992b16	38	u8 proto;
cf308a1f HS	39	};
cf308a1f HS	40
d1992b16	41	static inline __be32 hmark_addr6_mask(const __be32 addr32, const __be32 mask)
cf308a1f HS	42	{
	43	return (addr32[0] & mask[0]) ^
	44	(addr32[1] & mask[1]) ^
	45	(addr32[2] & mask[2]) ^
	46	(addr32[3] & mask[3]);
	47	}
	48
d1992b16 HS	49	static inline __be32
d1992b16 HS	50	hmark_addr_mask(int l3num, const __be32 addr32, const __be32 mask)
cf308a1f HS	51	{
	52	switch (l3num) {
	53	case AF_INET:
	54	return addr32 & mask;
	55	case AF_INET6:
	56	return hmark_addr6_mask(addr32, mask);
	57	}
	58	return 0;
	59	}
	60
d1992b16 HS	61	static inline void hmark_swap_ports(union hmark_ports *uports,
	62	const struct xt_hmark_info *info)
	63	{
	64	union hmark_ports hp;
	65	u16 src, dst;
	66
	67	hp.b32 = (uports->b32 & info->port_mask.b32) \| info->port_set.b32;
	68	src = ntohs(hp.b16.src);
	69	dst = ntohs(hp.b16.dst);
	70
	71	if (dst > src)
	72	uports->v32 = (dst << 16) \| src;
	73	else
	74	uports->v32 = (src << 16) \| dst;
	75	}
	76
cf308a1f HS	77	static int
	78	hmark_ct_set_htuple(const struct sk_buff skb, struct hmark_tuple t,
	79	const struct xt_hmark_info *info)
	80	{
	81	#if IS_ENABLED(CONFIG_NF_CONNTRACK)
	82	enum ip_conntrack_info ctinfo;
	83	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
	84	struct nf_conntrack_tuple *otuple;
	85	struct nf_conntrack_tuple *rtuple;
	86
	87	if (ct == NULL \|\| nf_ct_is_untracked(ct))
	88	return -1;
	89
	90	otuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
	91	rtuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
	92
d1992b16 HS	93	t->src = hmark_addr_mask(otuple->src.l3num, otuple->src.u3.ip6,
	94	info->src_mask.ip6);
	95	t->dst = hmark_addr_mask(otuple->src.l3num, rtuple->src.u3.ip6,
	96	info->dst_mask.ip6);
cf308a1f HS	97
	98	if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
	99	return 0;
	100
	101	t->proto = nf_ct_protonum(ct);
	102	if (t->proto != IPPROTO_ICMP) {
d1992b16 HS	103	t->uports.b16.src = otuple->src.u.all;
	104	t->uports.b16.dst = rtuple->src.u.all;
	105	hmark_swap_ports(&t->uports, info);
cf308a1f HS	106	}
	107
	108	return 0;
	109	#else
	110	return -1;
	111	#endif
	112	}
	113
d1992b16 HS	114	/* This hash function is endian independent, to ensure consistent hashing if
d1992b16 HS	115	* the cluster is composed of big and little endian systems. */
cf308a1f HS	116	static inline u32
	117	hmark_hash(struct hmark_tuple t, const struct xt_hmark_info info)
	118	{
	119	u32 hash;
d1992b16 HS	120	u32 src = ntohl(t->src);
d1992b16 HS	121	u32 dst = ntohl(t->dst);
cf308a1f	122
d1992b16 HS	123	if (dst < src)
d1992b16 HS	124	swap(src, dst);
cf308a1f	125
d1992b16	126	hash = jhash_3words(src, dst, t->uports.v32, info->hashrnd);
cf308a1f HS	127	hash = hash ^ (t->proto & info->proto_mask);
cf308a1f HS	128
c44f5faa	129	return (((u64)hash * info->hmodulus) >> 32) + info->hoffset;
cf308a1f HS	130	}
	131
	132	static void
	133	hmark_set_tuple_ports(const struct sk_buff *skb, unsigned int nhoff,
	134	struct hmark_tuple t, const struct xt_hmark_info info)
	135	{
	136	int protoff;
	137
	138	protoff = proto_ports_offset(t->proto);
	139	if (protoff < 0)
	140	return;
	141
	142	nhoff += protoff;
	143	if (skb_copy_bits(skb, nhoff, &t->uports, sizeof(t->uports)) < 0)
	144	return;
	145
d1992b16	146	hmark_swap_ports(&t->uports, info);
cf308a1f HS	147	}
	148
	149	#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
	150	static int get_inner6_hdr(const struct sk_buff skb, int offset)
	151	{
	152	struct icmp6hdr *icmp6h, _ih6;
	153
	154	icmp6h = skb_header_pointer(skb, *offset, sizeof(_ih6), &_ih6);
	155	if (icmp6h == NULL)
	156	return 0;
	157
	158	if (icmp6h->icmp6_type && icmp6h->icmp6_type < 128) {
	159	*offset += sizeof(struct icmp6hdr);
	160	return 1;
	161	}
	162	return 0;
	163	}
	164
	165	static int
	166	hmark_pkt_set_htuple_ipv6(const struct sk_buff skb, struct hmark_tuple t,
	167	const struct xt_hmark_info *info)
	168	{
	169	struct ipv6hdr *ip6, _ip6;
f8f62675	170	int flag = IP6_FH_F_AUTH;
cf308a1f HS	171	unsigned int nhoff = 0;
	172	u16 fragoff = 0;
	173	int nexthdr;
	174
	175	ip6 = (struct ipv6hdr *) (skb->data + skb_network_offset(skb));
	176	nexthdr = ipv6_find_hdr(skb, &nhoff, -1, &fragoff, &flag);
	177	if (nexthdr < 0)
	178	return 0;
	179	/* No need to check for icmp errors on fragments */
f8f62675	180	if ((flag & IP6_FH_F_FRAG) \|\| (nexthdr != IPPROTO_ICMPV6))
cf308a1f HS	181	goto noicmp;
	182	/* Use inner header in case of ICMP errors */
	183	if (get_inner6_hdr(skb, &nhoff)) {
	184	ip6 = skb_header_pointer(skb, nhoff, sizeof(_ip6), &_ip6);
	185	if (ip6 == NULL)
	186	return -1;
	187	/* If AH present, use SPI like in ESP. */
f8f62675	188	flag = IP6_FH_F_AUTH;
cf308a1f HS	189	nexthdr = ipv6_find_hdr(skb, &nhoff, -1, &fragoff, &flag);
	190	if (nexthdr < 0)
	191	return -1;
	192	}
	193	noicmp:
d1992b16 HS	194	t->src = hmark_addr6_mask(ip6->saddr.s6_addr32, info->src_mask.ip6);
d1992b16 HS	195	t->dst = hmark_addr6_mask(ip6->daddr.s6_addr32, info->dst_mask.ip6);
cf308a1f HS	196
	197	if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
	198	return 0;
	199
	200	t->proto = nexthdr;
	201	if (t->proto == IPPROTO_ICMPV6)
	202	return 0;
	203
f8f62675	204	if (flag & IP6_FH_F_FRAG)
cf308a1f HS	205	return 0;
	206
	207	hmark_set_tuple_ports(skb, nhoff, t, info);
	208	return 0;
	209	}
	210
	211	static unsigned int
	212	hmark_tg_v6(struct sk_buff skb, const struct xt_action_param par)
	213	{
	214	const struct xt_hmark_info *info = par->targinfo;
	215	struct hmark_tuple t;
	216
	217	memset(&t, 0, sizeof(struct hmark_tuple));
	218
	219	if (info->flags & XT_HMARK_FLAG(XT_HMARK_CT)) {
	220	if (hmark_ct_set_htuple(skb, &t, info) < 0)
	221	return XT_CONTINUE;
	222	} else {
	223	if (hmark_pkt_set_htuple_ipv6(skb, &t, info) < 0)
	224	return XT_CONTINUE;
	225	}
	226
	227	skb->mark = hmark_hash(&t, info);
	228	return XT_CONTINUE;
	229	}
	230	#endif
	231
	232	static int get_inner_hdr(const struct sk_buff skb, int iphsz, int nhoff)
	233	{
	234	const struct icmphdr *icmph;
	235	struct icmphdr _ih;
	236
	237	/* Not enough header? */
	238	icmph = skb_header_pointer(skb, *nhoff + iphsz, sizeof(_ih), &_ih);
58618115	239	if (icmph == NULL \|\| icmph->type > NR_ICMP_TYPES)
cf308a1f HS	240	return 0;
	241
	242	/* Error message? */
	243	if (icmph->type != ICMP_DEST_UNREACH &&
	244	icmph->type != ICMP_SOURCE_QUENCH &&
	245	icmph->type != ICMP_TIME_EXCEEDED &&
	246	icmph->type != ICMP_PARAMETERPROB &&
	247	icmph->type != ICMP_REDIRECT)
	248	return 0;
	249
	250	*nhoff += iphsz + sizeof(_ih);
	251	return 1;
	252	}
	253
	254	static int
	255	hmark_pkt_set_htuple_ipv4(const struct sk_buff skb, struct hmark_tuple t,
	256	const struct xt_hmark_info *info)
	257	{
	258	struct iphdr *ip, _ip;
	259	int nhoff = skb_network_offset(skb);
	260
	261	ip = (struct iphdr *) (skb->data + nhoff);
	262	if (ip->protocol == IPPROTO_ICMP) {
	263	/* Use inner header in case of ICMP errors */
	264	if (get_inner_hdr(skb, ip->ihl * 4, &nhoff)) {
	265	ip = skb_header_pointer(skb, nhoff, sizeof(_ip), &_ip);
	266	if (ip == NULL)
	267	return -1;
	268	}
	269	}
	270
d1992b16 HS	271	t->src = ip->saddr & info->src_mask.ip;
d1992b16 HS	272	t->dst = ip->daddr & info->dst_mask.ip;
cf308a1f HS	273
	274	if (info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))
	275	return 0;
	276
	277	t->proto = ip->protocol;
	278
	279	/* ICMP has no ports, skip */
	280	if (t->proto == IPPROTO_ICMP)
	281	return 0;
	282
	283	/* follow-up fragments don't contain ports, skip all fragments */
	284	if (ip->frag_off & htons(IP_MF \| IP_OFFSET))
	285	return 0;
	286
	287	hmark_set_tuple_ports(skb, (ip->ihl * 4) + nhoff, t, info);
	288
	289	return 0;
	290	}
	291
	292	static unsigned int
	293	hmark_tg_v4(struct sk_buff skb, const struct xt_action_param par)
	294	{
	295	const struct xt_hmark_info *info = par->targinfo;
	296	struct hmark_tuple t;
	297
	298	memset(&t, 0, sizeof(struct hmark_tuple));
	299
	300	if (info->flags & XT_HMARK_FLAG(XT_HMARK_CT)) {
	301	if (hmark_ct_set_htuple(skb, &t, info) < 0)
	302	return XT_CONTINUE;
	303	} else {
	304	if (hmark_pkt_set_htuple_ipv4(skb, &t, info) < 0)
	305	return XT_CONTINUE;
	306	}
	307
	308	skb->mark = hmark_hash(&t, info);
	309	return XT_CONTINUE;
	310	}
	311
	312	static int hmark_tg_check(const struct xt_tgchk_param *par)
	313	{
	314	const struct xt_hmark_info *info = par->targinfo;
	315
	316	if (!info->hmodulus) {
	317	pr_info("xt_HMARK: hash modulus can't be zero\n");
	318	return -EINVAL;
	319	}
	320	if (info->proto_mask &&
	321	(info->flags & XT_HMARK_FLAG(XT_HMARK_METHOD_L3))) {
	322	pr_info("xt_HMARK: proto mask must be zero with L3 mode\n");
	323	return -EINVAL;
	324	}
	325	if (info->flags & XT_HMARK_FLAG(XT_HMARK_SPI_MASK) &&
	326	(info->flags & (XT_HMARK_FLAG(XT_HMARK_SPORT_MASK) \|
	327	XT_HMARK_FLAG(XT_HMARK_DPORT_MASK)))) {
	328	pr_info("xt_HMARK: spi-mask and port-mask can't be combined\n");
	329	return -EINVAL;
	330	}
	331	if (info->flags & XT_HMARK_FLAG(XT_HMARK_SPI) &&
	332	(info->flags & (XT_HMARK_FLAG(XT_HMARK_SPORT) \|
	333	XT_HMARK_FLAG(XT_HMARK_DPORT)))) {
	334	pr_info("xt_HMARK: spi-set and port-set can't be combined\n");
	335	return -EINVAL;
	336	}
337	return 0;
338	}
339
340	static struct xt_target hmark_tg_reg[] __read_mostly = {
341	{
342	.name = "HMARK",
343	.family = NFPROTO_IPV4,
344	.target = hmark_tg_v4,
345	.targetsize = sizeof(struct xt_hmark_info),
346	.checkentry = hmark_tg_check,
347	.me = THIS_MODULE,
348	},
349	#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
350	{
351	.name = "HMARK",
352	.family = NFPROTO_IPV6,
353	.target = hmark_tg_v6,
354	.targetsize = sizeof(struct xt_hmark_info),
355	.checkentry = hmark_tg_check,
356	.me = THIS_MODULE,
357	},
358	#endif
359	};
360
361	static int __init hmark_tg_init(void)
362	{
363	return xt_register_targets(hmark_tg_reg, ARRAY_SIZE(hmark_tg_reg));
364	}
365
366	static void __exit hmark_tg_exit(void)
367	{
368	xt_unregister_targets(hmark_tg_reg, ARRAY_SIZE(hmark_tg_reg));
369	}
370
371	module_init(hmark_tg_init);
372	module_exit(hmark_tg_exit);