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-rw-r--r--net/ipv4/netfilter/ipt_ECN.c141
-rw-r--r--net/ipv4/tcp.c3
-rw-r--r--net/netfilter/xt_MARK.c56
-rw-r--r--net/netfilter/xt_RATEEST.c183
-rw-r--r--net/netfilter/xt_connmark.c87
-rw-r--r--net/netfilter/xt_dscp.c115
-rw-r--r--net/netfilter/xt_hl.c108
-rw-r--r--net/netfilter/xt_tcpmss.c110
8 files changed, 800 insertions, 3 deletions
diff --git a/net/ipv4/netfilter/ipt_ECN.c b/net/ipv4/netfilter/ipt_ECN.c
new file mode 100644
index 00000000000..f7e2fa0974d
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_ECN.c
@@ -0,0 +1,141 @@
+/* iptables module for the IPv4 and TCP ECN bits, Version 1.5
+ *
+ * (C) 2002 by Harald Welte <laforge@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/in.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <net/ip.h>
+#include <linux/tcp.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ECN.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: Explicit Congestion Notification (ECN) flag modification");
+
+/* set ECT codepoint from IP header.
+ * return false if there was an error. */
+static inline bool
+set_ect_ip(struct sk_buff *skb, const struct ipt_ECN_info *einfo)
+{
+ struct iphdr *iph = ip_hdr(skb);
+
+ if ((iph->tos & IPT_ECN_IP_MASK) != (einfo->ip_ect & IPT_ECN_IP_MASK)) {
+ __u8 oldtos;
+ if (!skb_make_writable(skb, sizeof(struct iphdr)))
+ return false;
+ iph = ip_hdr(skb);
+ oldtos = iph->tos;
+ iph->tos &= ~IPT_ECN_IP_MASK;
+ iph->tos |= (einfo->ip_ect & IPT_ECN_IP_MASK);
+ csum_replace2(&iph->check, htons(oldtos), htons(iph->tos));
+ }
+ return true;
+}
+
+/* Return false if there was an error. */
+static inline bool
+set_ect_tcp(struct sk_buff *skb, const struct ipt_ECN_info *einfo)
+{
+ struct tcphdr _tcph, *tcph;
+ __be16 oldval;
+
+ /* Not enought header? */
+ tcph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_tcph), &_tcph);
+ if (!tcph)
+ return false;
+
+ if ((!(einfo->operation & IPT_ECN_OP_SET_ECE) ||
+ tcph->ece == einfo->proto.tcp.ece) &&
+ (!(einfo->operation & IPT_ECN_OP_SET_CWR) ||
+ tcph->cwr == einfo->proto.tcp.cwr))
+ return true;
+
+ if (!skb_make_writable(skb, ip_hdrlen(skb) + sizeof(*tcph)))
+ return false;
+ tcph = (void *)ip_hdr(skb) + ip_hdrlen(skb);
+
+ oldval = ((__be16 *)tcph)[6];
+ if (einfo->operation & IPT_ECN_OP_SET_ECE)
+ tcph->ece = einfo->proto.tcp.ece;
+ if (einfo->operation & IPT_ECN_OP_SET_CWR)
+ tcph->cwr = einfo->proto.tcp.cwr;
+
+ inet_proto_csum_replace2(&tcph->check, skb,
+ oldval, ((__be16 *)tcph)[6], 0);
+ return true;
+}
+
+static unsigned int
+ecn_tg(struct sk_buff *skb, const struct xt_target_param *par)
+{
+ const struct ipt_ECN_info *einfo = par->targinfo;
+
+ if (einfo->operation & IPT_ECN_OP_SET_IP)
+ if (!set_ect_ip(skb, einfo))
+ return NF_DROP;
+
+ if (einfo->operation & (IPT_ECN_OP_SET_ECE | IPT_ECN_OP_SET_CWR)
+ && ip_hdr(skb)->protocol == IPPROTO_TCP)
+ if (!set_ect_tcp(skb, einfo))
+ return NF_DROP;
+
+ return XT_CONTINUE;
+}
+
+static bool ecn_tg_check(const struct xt_tgchk_param *par)
+{
+ const struct ipt_ECN_info *einfo = par->targinfo;
+ const struct ipt_entry *e = par->entryinfo;
+
+ if (einfo->operation & IPT_ECN_OP_MASK) {
+ printk(KERN_WARNING "ECN: unsupported ECN operation %x\n",
+ einfo->operation);
+ return false;
+ }
+ if (einfo->ip_ect & ~IPT_ECN_IP_MASK) {
+ printk(KERN_WARNING "ECN: new ECT codepoint %x out of mask\n",
+ einfo->ip_ect);
+ return false;
+ }
+ if ((einfo->operation & (IPT_ECN_OP_SET_ECE|IPT_ECN_OP_SET_CWR))
+ && (e->ip.proto != IPPROTO_TCP || (e->ip.invflags & XT_INV_PROTO))) {
+ printk(KERN_WARNING "ECN: cannot use TCP operations on a "
+ "non-tcp rule\n");
+ return false;
+ }
+ return true;
+}
+
+static struct xt_target ecn_tg_reg __read_mostly = {
+ .name = "ECN",
+ .family = NFPROTO_IPV4,
+ .target = ecn_tg,
+ .targetsize = sizeof(struct ipt_ECN_info),
+ .table = "mangle",
+ .checkentry = ecn_tg_check,
+ .me = THIS_MODULE,
+};
+
+static int __init ecn_tg_init(void)
+{
+ return xt_register_target(&ecn_tg_reg);
+}
+
+static void __exit ecn_tg_exit(void)
+{
+ xt_unregister_target(&ecn_tg_reg);
+}
+
+module_init(ecn_tg_init);
+module_exit(ecn_tg_exit);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index b66a1d32de4..72fa141d17d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -658,13 +658,10 @@ ssize_t tcp_splice_read(struct socket *sock, loff_t *ppos,
}
if (sk->sk_shutdown & RCV_SHUTDOWN)
{
-
-/* SH - 04/15/11 - removed print, these were filling up logs in some environments
printk(KERN_ERR "%s:%s:%d\n"
"breaking %d\n",
__FUNCTION__, __FILE__, __LINE__,
ret);
-*/
break;
}
if (sk->sk_state == TCP_CLOSE) {
diff --git a/net/netfilter/xt_MARK.c b/net/netfilter/xt_MARK.c
new file mode 100644
index 00000000000..225f8d11e17
--- /dev/null
+++ b/net/netfilter/xt_MARK.c
@@ -0,0 +1,56 @@
+/*
+ * xt_MARK - Netfilter module to modify the NFMARK field of an skb
+ *
+ * (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
+ * Copyright © CC Computer Consultants GmbH, 2007 - 2008
+ * Jan Engelhardt <jengelh@computergmbh.de>
+ *
+ * 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/ip.h>
+#include <net/checksum.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_MARK.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("Xtables: packet mark modification");
+MODULE_ALIAS("ipt_MARK");
+MODULE_ALIAS("ip6t_MARK");
+
+static unsigned int
+mark_tg(struct sk_buff *skb, const struct xt_target_param *par)
+{
+ const struct xt_mark_tginfo2 *info = par->targinfo;
+
+ skb->mark = (skb->mark & ~info->mask) ^ info->mark;
+ return XT_CONTINUE;
+}
+
+static struct xt_target mark_tg_reg __read_mostly = {
+ .name = "MARK",
+ .revision = 2,
+ .family = NFPROTO_UNSPEC,
+ .target = mark_tg,
+ .targetsize = sizeof(struct xt_mark_tginfo2),
+ .me = THIS_MODULE,
+};
+
+static int __init mark_tg_init(void)
+{
+ return xt_register_target(&mark_tg_reg);
+}
+
+static void __exit mark_tg_exit(void)
+{
+ xt_unregister_target(&mark_tg_reg);
+}
+
+module_init(mark_tg_init);
+module_exit(mark_tg_exit);
diff --git a/net/netfilter/xt_RATEEST.c b/net/netfilter/xt_RATEEST.c
new file mode 100644
index 00000000000..d80b8192e0d
--- /dev/null
+++ b/net/netfilter/xt_RATEEST.c
@@ -0,0 +1,183 @@
+/*
+ * (C) 2007 Patrick McHardy <kaber@trash.net>
+ *
+ * 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/gen_stats.h>
+#include <linux/jhash.h>
+#include <linux/rtnetlink.h>
+#include <linux/random.h>
+#include <net/gen_stats.h>
+#include <net/netlink.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_RATEEST.h>
+#include <net/netfilter/xt_rateest.h>
+
+static DEFINE_MUTEX(xt_rateest_mutex);
+
+#define RATEEST_HSIZE 16
+static struct hlist_head rateest_hash[RATEEST_HSIZE] __read_mostly;
+static unsigned int jhash_rnd __read_mostly;
+
+static unsigned int xt_rateest_hash(const char *name)
+{
+ return jhash(name, FIELD_SIZEOF(struct xt_rateest, name), jhash_rnd) &
+ (RATEEST_HSIZE - 1);
+}
+
+static void xt_rateest_hash_insert(struct xt_rateest *est)
+{
+ unsigned int h;
+
+ h = xt_rateest_hash(est->name);
+ hlist_add_head(&est->list, &rateest_hash[h]);
+}
+
+struct xt_rateest *xt_rateest_lookup(const char *name)
+{
+ struct xt_rateest *est;
+ struct hlist_node *n;
+ unsigned int h;
+
+ h = xt_rateest_hash(name);
+ mutex_lock(&xt_rateest_mutex);
+ hlist_for_each_entry(est, n, &rateest_hash[h], list) {
+ if (strcmp(est->name, name) == 0) {
+ est->refcnt++;
+ mutex_unlock(&xt_rateest_mutex);
+ return est;
+ }
+ }
+ mutex_unlock(&xt_rateest_mutex);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(xt_rateest_lookup);
+
+void xt_rateest_put(struct xt_rateest *est)
+{
+ mutex_lock(&xt_rateest_mutex);
+ if (--est->refcnt == 0) {
+ hlist_del(&est->list);
+ gen_kill_estimator(&est->bstats, &est->rstats);
+ kfree(est);
+ }
+ mutex_unlock(&xt_rateest_mutex);
+}
+EXPORT_SYMBOL_GPL(xt_rateest_put);
+
+static unsigned int
+xt_rateest_tg(struct sk_buff *skb, const struct xt_target_param *par)
+{
+ const struct xt_rateest_target_info *info = par->targinfo;
+ struct gnet_stats_basic_packed *stats = &info->est->bstats;
+
+ spin_lock_bh(&info->est->lock);
+ stats->bytes += skb->len;
+ stats->packets++;
+ spin_unlock_bh(&info->est->lock);
+
+ return XT_CONTINUE;
+}
+
+static bool xt_rateest_tg_checkentry(const struct xt_tgchk_param *par)
+{
+ struct xt_rateest_target_info *info = par->targinfo;
+ struct xt_rateest *est;
+ struct {
+ struct nlattr opt;
+ struct gnet_estimator est;
+ } cfg;
+
+ est = xt_rateest_lookup(info->name);
+ if (est) {
+ /*
+ * If estimator parameters are specified, they must match the
+ * existing estimator.
+ */
+ if ((!info->interval && !info->ewma_log) ||
+ (info->interval != est->params.interval ||
+ info->ewma_log != est->params.ewma_log)) {
+ xt_rateest_put(est);
+ return false;
+ }
+ info->est = est;
+ return true;
+ }
+
+ est = kzalloc(sizeof(*est), GFP_KERNEL);
+ if (!est)
+ goto err1;
+
+ strlcpy(est->name, info->name, sizeof(est->name));
+ spin_lock_init(&est->lock);
+ est->refcnt = 1;
+ est->params.interval = info->interval;
+ est->params.ewma_log = info->ewma_log;
+
+ cfg.opt.nla_len = nla_attr_size(sizeof(cfg.est));
+ cfg.opt.nla_type = TCA_STATS_RATE_EST;
+ cfg.est.interval = info->interval;
+ cfg.est.ewma_log = info->ewma_log;
+
+ if (gen_new_estimator(&est->bstats, &est->rstats, &est->lock,
+ &cfg.opt) < 0)
+ goto err2;
+
+ info->est = est;
+ xt_rateest_hash_insert(est);
+
+ return true;
+
+err2:
+ kfree(est);
+err1:
+ return false;
+}
+
+static void xt_rateest_tg_destroy(const struct xt_tgdtor_param *par)
+{
+ struct xt_rateest_target_info *info = par->targinfo;
+
+ xt_rateest_put(info->est);
+}
+
+static struct xt_target xt_rateest_tg_reg __read_mostly = {
+ .name = "RATEEST",
+ .revision = 0,
+ .family = NFPROTO_UNSPEC,
+ .target = xt_rateest_tg,
+ .checkentry = xt_rateest_tg_checkentry,
+ .destroy = xt_rateest_tg_destroy,
+ .targetsize = sizeof(struct xt_rateest_target_info),
+ .me = THIS_MODULE,
+};
+
+static int __init xt_rateest_tg_init(void)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(rateest_hash); i++)
+ INIT_HLIST_HEAD(&rateest_hash[i]);
+
+ get_random_bytes(&jhash_rnd, sizeof(jhash_rnd));
+ return xt_register_target(&xt_rateest_tg_reg);
+}
+
+static void __exit xt_rateest_tg_fini(void)
+{
+ xt_unregister_target(&xt_rateest_tg_reg);
+}
+
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: packet rate estimator");
+MODULE_ALIAS("ipt_RATEEST");
+MODULE_ALIAS("ip6t_RATEEST");
+module_init(xt_rateest_tg_init);
+module_exit(xt_rateest_tg_fini);
diff --git a/net/netfilter/xt_connmark.c b/net/netfilter/xt_connmark.c
new file mode 100644
index 00000000000..122aa8b0147
--- /dev/null
+++ b/net/netfilter/xt_connmark.c
@@ -0,0 +1,87 @@
+/*
+ * xt_connmark - Netfilter module to match connection mark values
+ *
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ * Copyright © CC Computer Consultants GmbH, 2007 - 2008
+ * Jan Engelhardt <jengelh@computergmbh.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_connmark.h>
+
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
+MODULE_DESCRIPTION("Xtables: connection mark match");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_connmark");
+MODULE_ALIAS("ip6t_connmark");
+
+static bool
+connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+ const struct xt_connmark_mtinfo1 *info = par->matchinfo;
+ enum ip_conntrack_info ctinfo;
+ const struct nf_conn *ct;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct == NULL)
+ return false;
+
+ return ((ct->mark & info->mask) == info->mark) ^ info->invert;
+}
+
+static bool connmark_mt_check(const struct xt_mtchk_param *par)
+{
+ if (nf_ct_l3proto_try_module_get(par->family) < 0) {
+ printk(KERN_WARNING "cannot load conntrack support for "
+ "proto=%u\n", par->family);
+ return false;
+ }
+ return true;
+}
+
+static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
+{
+ nf_ct_l3proto_module_put(par->family);
+}
+
+static struct xt_match connmark_mt_reg __read_mostly = {
+ .name = "connmark",
+ .revision = 1,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = connmark_mt_check,
+ .match = connmark_mt,
+ .matchsize = sizeof(struct xt_connmark_mtinfo1),
+ .destroy = connmark_mt_destroy,
+ .me = THIS_MODULE,
+};
+
+static int __init connmark_mt_init(void)
+{
+ return xt_register_match(&connmark_mt_reg);
+}
+
+static void __exit connmark_mt_exit(void)
+{
+ xt_unregister_match(&connmark_mt_reg);
+}
+
+module_init(connmark_mt_init);
+module_exit(connmark_mt_exit);
diff --git a/net/netfilter/xt_dscp.c b/net/netfilter/xt_dscp.c
new file mode 100644
index 00000000000..0280d3a8c16
--- /dev/null
+++ b/net/netfilter/xt_dscp.c
@@ -0,0 +1,115 @@
+/* IP tables module for matching the value of the IPv4/IPv6 DSCP field
+ *
+ * (C) 2002 by Harald Welte <laforge@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/ip.h>
+#include <linux/ipv6.h>
+#include <net/dsfield.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_dscp.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: DSCP/TOS field match");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_dscp");
+MODULE_ALIAS("ip6t_dscp");
+MODULE_ALIAS("ipt_tos");
+MODULE_ALIAS("ip6t_tos");
+
+static bool
+dscp_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+ const struct xt_dscp_info *info = par->matchinfo;
+ u_int8_t dscp = ipv4_get_dsfield(ip_hdr(skb)) >> XT_DSCP_SHIFT;
+
+ return (dscp == info->dscp) ^ !!info->invert;
+}
+
+static bool
+dscp_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+ const struct xt_dscp_info *info = par->matchinfo;
+ u_int8_t dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> XT_DSCP_SHIFT;
+
+ return (dscp == info->dscp) ^ !!info->invert;
+}
+
+static bool dscp_mt_check(const struct xt_mtchk_param *par)
+{
+ const struct xt_dscp_info *info = par->matchinfo;
+
+ if (info->dscp > XT_DSCP_MAX) {
+ printk(KERN_ERR "xt_dscp: dscp %x out of range\n", info->dscp);
+ return false;
+ }
+
+ return true;
+}
+
+static bool tos_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+ const struct xt_tos_match_info *info = par->matchinfo;
+
+ if (par->match->family == NFPROTO_IPV4)
+ return ((ip_hdr(skb)->tos & info->tos_mask) ==
+ info->tos_value) ^ !!info->invert;
+ else
+ return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) ==
+ info->tos_value) ^ !!info->invert;
+}
+
+static struct xt_match dscp_mt_reg[] __read_mostly = {
+ {
+ .name = "dscp",
+ .family = NFPROTO_IPV4,
+ .checkentry = dscp_mt_check,
+ .match = dscp_mt,
+ .matchsize = sizeof(struct xt_dscp_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "dscp",
+ .family = NFPROTO_IPV6,
+ .checkentry = dscp_mt_check,
+ .match = dscp_mt6,
+ .matchsize = sizeof(struct xt_dscp_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "tos",
+ .revision = 1,
+ .family = NFPROTO_IPV4,
+ .match = tos_mt,
+ .matchsize = sizeof(struct xt_tos_match_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "tos",
+ .revision = 1,
+ .family = NFPROTO_IPV6,
+ .match = tos_mt,
+ .matchsize = sizeof(struct xt_tos_match_info),
+ .me = THIS_MODULE,
+ },
+};
+
+static int __init dscp_mt_init(void)
+{
+ return xt_register_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
+}
+
+static void __exit dscp_mt_exit(void)
+{
+ xt_unregister_matches(dscp_mt_reg, ARRAY_SIZE(dscp_mt_reg));
+}
+
+module_init(dscp_mt_init);
+module_exit(dscp_mt_exit);
diff --git a/net/netfilter/xt_hl.c b/net/netfilter/xt_hl.c
new file mode 100644
index 00000000000..7726154c87b
--- /dev/null
+++ b/net/netfilter/xt_hl.c
@@ -0,0 +1,108 @@
+/*
+ * IP tables module for matching the value of the TTL
+ * (C) 2000,2001 by Harald Welte <laforge@netfilter.org>
+ *
+ * Hop Limit matching module
+ * (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv>
+ *
+ * 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/ip.h>
+#include <linux/ipv6.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv4/ipt_ttl.h>
+#include <linux/netfilter_ipv6/ip6t_hl.h>
+
+MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");
+MODULE_DESCRIPTION("Xtables: Hoplimit/TTL field match");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_ttl");
+MODULE_ALIAS("ip6t_hl");
+
+static bool ttl_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+ const struct ipt_ttl_info *info = par->matchinfo;
+ const u8 ttl = ip_hdr(skb)->ttl;
+
+ switch (info->mode) {
+ case IPT_TTL_EQ:
+ return ttl == info->ttl;
+ case IPT_TTL_NE:
+ return ttl != info->ttl;
+ case IPT_TTL_LT:
+ return ttl < info->ttl;
+ case IPT_TTL_GT:
+ return ttl > info->ttl;
+ default:
+ printk(KERN_WARNING "ipt_ttl: unknown mode %d\n",
+ info->mode);
+ return false;
+ }
+
+ return false;
+}
+
+static bool hl_mt6(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+ const struct ip6t_hl_info *info = par->matchinfo;
+ const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+
+ switch (info->mode) {
+ case IP6T_HL_EQ:
+ return ip6h->hop_limit == info->hop_limit;
+ break;
+ case IP6T_HL_NE:
+ return ip6h->hop_limit != info->hop_limit;
+ break;
+ case IP6T_HL_LT:
+ return ip6h->hop_limit < info->hop_limit;
+ break;
+ case IP6T_HL_GT:
+ return ip6h->hop_limit > info->hop_limit;
+ break;
+ default:
+ printk(KERN_WARNING "ip6t_hl: unknown mode %d\n",
+ info->mode);
+ return false;
+ }
+
+ return false;
+}
+
+static struct xt_match hl_mt_reg[] __read_mostly = {
+ {
+ .name = "ttl",
+ .revision = 0,
+ .family = NFPROTO_IPV4,
+ .match = ttl_mt,
+ .matchsize = sizeof(struct ipt_ttl_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "hl",
+ .revision = 0,
+ .family = NFPROTO_IPV6,
+ .match = hl_mt6,
+ .matchsize = sizeof(struct ip6t_hl_info),
+ .me = THIS_MODULE,
+ },
+};
+
+static int __init hl_mt_init(void)
+{
+ return xt_register_matches(hl_mt_reg, ARRAY_SIZE(hl_mt_reg));
+}
+
+static void __exit hl_mt_exit(void)
+{
+ xt_unregister_matches(hl_mt_reg, ARRAY_SIZE(hl_mt_reg));
+}
+
+module_init(hl_mt_init);
+module_exit(hl_mt_exit);
diff --git a/net/netfilter/xt_tcpmss.c b/net/netfilter/xt_tcpmss.c
new file mode 100644
index 00000000000..4809b34b10f
--- /dev/null
+++ b/net/netfilter/xt_tcpmss.c
@@ -0,0 +1,110 @@
+/* Kernel module to match TCP MSS values. */
+
+/* Copyright (C) 2000 Marc Boucher <marc@mbsi.ca>
+ * Portions (C) 2005 by Harald Welte <laforge@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 <net/tcp.h>
+
+#include <linux/netfilter/xt_tcpmss.h>
+#include <linux/netfilter/x_tables.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("Xtables: TCP MSS match");
+MODULE_ALIAS("ipt_tcpmss");
+MODULE_ALIAS("ip6t_tcpmss");
+
+static bool
+tcpmss_mt(const struct sk_buff *skb, const struct xt_match_param *par)
+{
+ const struct xt_tcpmss_match_info *info = par->matchinfo;
+ const struct tcphdr *th;
+ struct tcphdr _tcph;
+ /* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */
+ const u_int8_t *op;
+ u8 _opt[15 * 4 - sizeof(_tcph)];
+ unsigned int i, optlen;
+
+ /* If we don't have the whole header, drop packet. */
+ th = skb_header_pointer(skb, par->thoff, sizeof(_tcph), &_tcph);
+ if (th == NULL)
+ goto dropit;
+
+ /* Malformed. */
+ if (th->doff*4 < sizeof(*th))
+ goto dropit;
+
+ optlen = th->doff*4 - sizeof(*th);
+ if (!optlen)
+ goto out;
+
+ /* Truncated options. */
+ op = skb_header_pointer(skb, par->thoff + sizeof(*th), optlen, _opt);
+ if (op == NULL)
+ goto dropit;
+
+ for (i = 0; i < optlen; ) {
+ if (op[i] == TCPOPT_MSS
+ && (optlen - i) >= TCPOLEN_MSS
+ && op[i+1] == TCPOLEN_MSS) {
+ u_int16_t mssval;
+
+ mssval = (op[i+2] << 8) | op[i+3];
+
+ return (mssval >= info->mss_min &&
+ mssval <= info->mss_max) ^ info->invert;
+ }
+ if (op[i] < 2)
+ i++;
+ else
+ i += op[i+1] ? : 1;
+ }
+out:
+ return info->invert;
+
+dropit:
+ *par->hotdrop = true;
+ return false;
+}
+
+static struct xt_match tcpmss_mt_reg[] __read_mostly = {
+ {
+ .name = "tcpmss",
+ .family = NFPROTO_IPV4,
+ .match = tcpmss_mt,
+ .matchsize = sizeof(struct xt_tcpmss_match_info),
+ .proto = IPPROTO_TCP,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "tcpmss",
+ .family = NFPROTO_IPV6,
+ .match = tcpmss_mt,
+ .matchsize = sizeof(struct xt_tcpmss_match_info),
+ .proto = IPPROTO_TCP,
+ .me = THIS_MODULE,
+ },
+};
+
+static int __init tcpmss_mt_init(void)
+{
+ return xt_register_matches(tcpmss_mt_reg, ARRAY_SIZE(tcpmss_mt_reg));
+}
+
+static void __exit tcpmss_mt_exit(void)
+{
+ xt_unregister_matches(tcpmss_mt_reg, ARRAY_SIZE(tcpmss_mt_reg));
+}
+
+module_init(tcpmss_mt_init);
+module_exit(tcpmss_mt_exit);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-22 05:16:51 +0000