Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752834AbZIBOkN (ORCPT ); Wed, 2 Sep 2009 10:40:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752712AbZIBOkK (ORCPT ); Wed, 2 Sep 2009 10:40:10 -0400 Received: from smtp-out.google.com ([216.239.45.13]:9519 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752638AbZIBOkG (ORCPT ); Wed, 2 Sep 2009 10:40:06 -0400 DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=subject:to:cc:cc:cc:cc:cc:cc:cc:cc:cc:cc:cc:cc:from: message-id:in-reply-to:references:user-agent:mime-version: content-type:content-transfer-encoding:date:x-system-of-record; b=yXGVAc1SdMAuzAqzBAortN/L/NE7P9ax47C8tD2sOK+6BtKPxKyaJSNHG9aqEZaPm u6Dagm+L9RKiFTTwygU5w== Subject: [PATCH 1/3] netfilter: xt_ipvs (netfilter matcher for IPVS) To: lvs-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: netdev@vger.kernel.org Cc: netfilter-devel@vger.kernel.org Cc: =?ISO-8859-1?Q?Fabien_Duch=EAne?= Cc: Jan Engelhardt Cc: Jean-Luc Fortemaison Cc: Julian Anastasov Cc: Julius Volz Cc: Laurent Grawet Cc: Patrick McHardy Cc: Simon Horman Cc: Wensong Zhang From: Hannes Eder Message-ID: <20090902101527.11561.59498.stgit@jazzy.zrh.corp.google.com> In-Reply-To: <20090902101417.11561.45663.stgit@jazzy.zrh.corp.google.com> References: <20090902101417.11561.45663.stgit@jazzy.zrh.corp.google.com> User-Agent: StGit/0.15-rc1-9-gd8846-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Date: Wed, 2 Sep 2009 16:39:22 +0200 (CEST) X-System-Of-Record: true Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7369 Lines: 283 This implements the kernel-space side of the netfilter matcher xt_ipvs. Signed-off-by: Hannes Eder --- include/linux/netfilter/xt_ipvs.h | 23 +++++ net/netfilter/Kconfig | 9 ++ net/netfilter/Makefile | 1 net/netfilter/ipvs/ip_vs_proto.c | 1 net/netfilter/xt_ipvs.c | 183 +++++++++++++++++++++++++++++++++++++ 5 files changed, 217 insertions(+), 0 deletions(-) create mode 100644 include/linux/netfilter/xt_ipvs.h create mode 100644 net/netfilter/xt_ipvs.c diff --git a/include/linux/netfilter/xt_ipvs.h b/include/linux/netfilter/xt_ipvs.h new file mode 100644 index 0000000..eb09759 --- /dev/null +++ b/include/linux/netfilter/xt_ipvs.h @@ -0,0 +1,23 @@ +#ifndef _XT_IPVS_H +#define _XT_IPVS_H 1 + +#define XT_IPVS_IPVS_PROPERTY 0x01 /* this is implied by all other options */ +#define XT_IPVS_PROTO 0x02 +#define XT_IPVS_VADDR 0x04 +#define XT_IPVS_VPORT 0x08 +#define XT_IPVS_DIR 0x10 +#define XT_IPVS_METHOD 0x20 +#define XT_IPVS_MASK (0x40 - 1) +#define XT_IPVS_ONCE_MASK (XT_IPVS_MASK & ~XT_IPVS_IPVS_PROPERTY) + +struct xt_ipvs { + union nf_inet_addr vaddr, vmask; + __be16 vport; + __u16 l4proto; + __u16 fwd_method; + + __u8 invert; + __u8 bitmask; +}; + +#endif /* _XT_IPVS_H */ diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 634d14a..fc35bd6 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -678,6 +678,15 @@ config NETFILTER_XT_MATCH_IPRANGE If unsure, say M. +config NETFILTER_XT_MATCH_IPVS + tristate '"ipvs" match support' + depends on IP_VS + depends on NETFILTER_ADVANCED + help + This option allows you to match against IPVS properties of a packet. + + If unsure, say N. + config NETFILTER_XT_MATCH_LENGTH tristate '"length" match support' depends on NETFILTER_ADVANCED diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index 49f62ee..ff95372 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -72,6 +72,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o obj-$(CONFIG_NETFILTER_XT_MATCH_HELPER) += xt_helper.o obj-$(CONFIG_NETFILTER_XT_MATCH_HL) += xt_hl.o obj-$(CONFIG_NETFILTER_XT_MATCH_IPRANGE) += xt_iprange.o +obj-$(CONFIG_NETFILTER_XT_MATCH_IPVS) += xt_ipvs.o obj-$(CONFIG_NETFILTER_XT_MATCH_LENGTH) += xt_length.o obj-$(CONFIG_NETFILTER_XT_MATCH_LIMIT) += xt_limit.o obj-$(CONFIG_NETFILTER_XT_MATCH_MAC) += xt_mac.o diff --git a/net/netfilter/ipvs/ip_vs_proto.c b/net/netfilter/ipvs/ip_vs_proto.c index 3e76716..db083c3 100644 --- a/net/netfilter/ipvs/ip_vs_proto.c +++ b/net/netfilter/ipvs/ip_vs_proto.c @@ -97,6 +97,7 @@ struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto) return NULL; } +EXPORT_SYMBOL(ip_vs_proto_get); /* diff --git a/net/netfilter/xt_ipvs.c b/net/netfilter/xt_ipvs.c new file mode 100644 index 0000000..579b053 --- /dev/null +++ b/net/netfilter/xt_ipvs.c @@ -0,0 +1,183 @@ +/* + * xt_ipvs - kernel module to match IPVS connection properties + * + * Author: Hannes Eder + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#ifdef CONFIG_IP_VS_IPV6 +#include +#endif +#include +#include +#include +#include +#include + +#include + +MODULE_AUTHOR("Hannes Eder "); +MODULE_DESCRIPTION("Xtables: match IPVS connection properties"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("ipt_ipvs"); +MODULE_ALIAS("ip6t_ipvs"); + +/* borrowed from xt_conntrack */ +static bool ipvs_mt_addrcmp(const union nf_inet_addr *kaddr, + const union nf_inet_addr *uaddr, + const union nf_inet_addr *umask, + unsigned int l3proto) +{ + if (l3proto == NFPROTO_IPV4) + return ((kaddr->ip ^ uaddr->ip) & umask->ip) == 0; +#ifdef CONFIG_IP_VS_IPV6 + else if (l3proto == NFPROTO_IPV6) + return ipv6_masked_addr_cmp(&kaddr->in6, &umask->in6, + &uaddr->in6) == 0; +#endif + else + return false; +} + +bool ipvs_mt(const struct sk_buff *skb, const struct xt_match_param *par) +{ + const struct xt_ipvs *data = par->matchinfo; + const u_int8_t family = par->family; + struct ip_vs_iphdr iph; + struct ip_vs_protocol *pp; + struct ip_vs_conn *cp; + int af; + bool match = true; + + if (data->bitmask == XT_IPVS_IPVS_PROPERTY) { + match = skb->ipvs_property ^ + !!(data->invert & XT_IPVS_IPVS_PROPERTY); + goto out; + } + + /* other flags than XT_IPVS_IPVS_PROPERTY are set */ + if (!skb->ipvs_property) { + match = false; + goto out; + } + + switch (skb->protocol) { + case htons(ETH_P_IP): + af = AF_INET; + break; +#ifdef CONFIG_IP_VS_IPV6 + case htons(ETH_P_IPV6): + af = AF_INET6; + break; +#endif + default: + match = false; + goto out; + } + + ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); + + if (data->bitmask & XT_IPVS_PROTO) + if ((iph.protocol == data->l4proto) ^ + !(data->invert & XT_IPVS_PROTO)) { + match = false; + goto out; + } + + pp = ip_vs_proto_get(iph.protocol); + if (unlikely(!pp)) { + match = false; + goto out; + } + + /* + * Check if the packet belongs to an existing entry + */ + cp = pp->conn_out_get(af, skb, pp, &iph, iph.len, 1 /* inverse */); + if (unlikely(cp == NULL)) { + match = false; + goto out; + } + + /* + * We found a connection, i.e. ct != 0, make sure to call + * __ip_vs_conn_put before returning. In our case jump to out_put_con. + */ + + if (data->bitmask & XT_IPVS_VPORT) + if ((cp->vport == data->vport) ^ + !(data->invert & XT_IPVS_VPORT)) { + match = false; + goto out_put_cp; + } + + if (data->bitmask & XT_IPVS_DIR) { + enum ip_conntrack_info ctinfo; + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); + + if (ct == NULL || ct == &nf_conntrack_untracked) { + match = false; + goto out_put_cp; + } + + if ((ctinfo >= IP_CT_IS_REPLY) ^ + !!(data->invert & XT_IPVS_DIR)) { + match = false; + goto out_put_cp; + } + } + + if (data->bitmask & XT_IPVS_METHOD) + if (((cp->flags & IP_VS_CONN_F_FWD_MASK) == data->fwd_method) ^ + !(data->invert & XT_IPVS_METHOD)) { + match = false; + goto out_put_cp; + } + + if (data->bitmask & XT_IPVS_VADDR) { + if (af != family) { + match = false; + goto out_put_cp; + } + + if (ipvs_mt_addrcmp(&cp->vaddr, &data->vaddr, + &data->vmask, af) ^ + !(data->invert & XT_IPVS_VADDR)) { + match = false; + goto out_put_cp; + } + } + +out_put_cp: + __ip_vs_conn_put(cp); +out: + pr_debug("match=%d\n", match); + return match; +} + +static struct xt_match xt_ipvs_mt_reg __read_mostly = { + .name = "ipvs", + .revision = 0, + .family = NFPROTO_UNSPEC, + .match = ipvs_mt, + .matchsize = sizeof(struct xt_ipvs), + .me = THIS_MODULE, +}; + +static int __init ipvs_mt_init(void) +{ + return xt_register_match(&xt_ipvs_mt_reg); +} + +static void __exit ipvs_mt_exit(void) +{ + xt_unregister_match(&xt_ipvs_mt_reg); +} + +module_init(ipvs_mt_init); +module_exit(ipvs_mt_exit); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/