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Message-ID: <20061201205954.GH11084@stusta.de>
Date: Fri, 1 Dec 2006 21:59:54 +0100
From: Adrian Bunk <bunk@...sta.de>
To: Harald Welte <laforge@...filter.org>
Cc: coreteam@...filter.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [2.6 patch] remove ip{,6}_queue
This patch removes ip{,6}_queue that were scheduled for removal
in mid-2005.
Signed-off-by: Adrian Bunk <bunk@...sta.de>
---
Documentation/feature-removal-schedule.txt | 12
Documentation/networking/ip-sysctl.txt | 1
include/linux/netfilter_ipv4/Kbuild | 1
include/linux/netfilter_ipv4/ip_queue.h | 72 --
include/linux/netlink.h | 4
net/core/dev.c | 2
net/ipv4/netfilter/Kconfig | 12
net/ipv4/netfilter/Makefile | 2
net/ipv4/netfilter/ip_queue.c | 742 ---------------------
net/ipv6/netfilter/Kconfig | 20
net/ipv6/netfilter/Makefile | 1
net/ipv6/netfilter/ip6_queue.c | 729 --------------------
security/selinux/hooks.c | 4
security/selinux/nlmsgtab.c | 13
14 files changed, 2 insertions(+), 1613 deletions(-)
--- linux-2.6.19-rc6-mm2/Documentation/feature-removal-schedule.txt.old 2006-12-01 19:35:09.000000000 +0100
+++ linux-2.6.19-rc6-mm2/Documentation/feature-removal-schedule.txt 2006-12-01 19:36:51.000000000 +0100
@@ -97,18 +97,6 @@
---------------------------
-What: ip_queue and ip6_queue (old ipv4-only and ipv6-only netfilter queue)
-When: December 2005
-Why: This interface has been obsoleted by the new layer3-independent
- "nfnetlink_queue". The Kernel interface is compatible, so the old
- ip[6]tables "QUEUE" targets still work and will transparently handle
- all packets into nfnetlink queue number 0. Userspace users will have
- to link against API-compatible library on top of libnfnetlink_queue
- instead of the current 'libipq'.
-Who: Harald Welte <laforge@...filter.org>
-
----------------------------
-
What: remove EXPORT_SYMBOL(kernel_thread)
When: August 2006
Files: arch/*/kernel/*_ksyms.c
--- linux-2.6.19-rc6-mm2/net/ipv4/netfilter/Kconfig.old 2006-12-01 19:36:01.000000000 +0100
+++ linux-2.6.19-rc6-mm2/net/ipv4/netfilter/Kconfig 2006-12-01 19:36:51.000000000 +0100
@@ -215,18 +215,6 @@
To compile it as a module, choose M here. If unsure, say Y.
-config IP_NF_QUEUE
- tristate "IP Userspace queueing via NETLINK (OBSOLETE)"
- help
- Netfilter has the ability to queue packets to user space: the
- netlink device can be used to access them using this driver.
-
- This option enables the old IPv4-only "ip_queue" implementation
- which has been obsoleted by the new "nfnetlink_queue" code (see
- CONFIG_NETFILTER_NETLINK_QUEUE).
-
- To compile it as a module, choose M here. If unsure, say N.
-
config IP_NF_IPTABLES
tristate "IP tables support (required for filtering/masq/NAT)"
depends on NETFILTER_XTABLES
--- linux-2.6.19-rc6-mm2/net/ipv4/netfilter/Makefile.old 2006-12-01 19:36:01.000000000 +0100
+++ linux-2.6.19-rc6-mm2/net/ipv4/netfilter/Makefile 2006-12-01 19:36:51.000000000 +0100
@@ -85,8 +85,6 @@
# just filtering instance of ARP tables for now
obj-$(CONFIG_IP_NF_ARPFILTER) += arptable_filter.o
-obj-$(CONFIG_IP_NF_QUEUE) += ip_queue.o
-
# objects for l3 independent conntrack
nf_conntrack_ipv4-objs := nf_conntrack_l3proto_ipv4.o nf_conntrack_proto_icmp.o
--- linux-2.6.19-rc6-mm2/net/ipv6/netfilter/Kconfig.old 2006-12-01 19:36:01.000000000 +0100
+++ linux-2.6.19-rc6-mm2/net/ipv6/netfilter/Kconfig 2006-12-01 19:36:51.000000000 +0100
@@ -19,26 +19,6 @@
To compile it as a module, choose M here. If unsure, say N.
-config IP6_NF_QUEUE
- tristate "IP6 Userspace queueing via NETLINK (OBSOLETE)"
- ---help---
-
- This option adds a queue handler to the kernel for IPv6
- packets which enables users to receive the filtered packets
- with QUEUE target using libipq.
-
- THis option enables the old IPv6-only "ip6_queue" implementation
- which has been obsoleted by the new "nfnetlink_queue" code (see
- CONFIG_NETFILTER_NETLINK_QUEUE).
-
- (C) Fernando Anton 2001
- IPv64 Project - Work based in IPv64 draft by Arturo Azcorra.
- Universidad Carlos III de Madrid
- Universidad Politecnica de Alcala de Henares
- email: <fanton@...uc3m.es>.
-
- To compile it as a module, choose M here. If unsure, say N.
-
config IP6_NF_IPTABLES
tristate "IP6 tables support (required for filtering)"
depends on NETFILTER_XTABLES
--- linux-2.6.19-rc6-mm2/net/ipv6/netfilter/Makefile.old 2006-12-01 19:36:01.000000000 +0100
+++ linux-2.6.19-rc6-mm2/net/ipv6/netfilter/Makefile 2006-12-01 19:36:51.000000000 +0100
@@ -14,7 +14,6 @@
obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
obj-$(CONFIG_IP6_NF_TARGET_HL) += ip6t_HL.o
-obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
--- linux-2.6.19-rc6-mm2/Documentation/networking/ip-sysctl.txt.old 2006-12-01 19:36:01.000000000 +0100
+++ linux-2.6.19-rc6-mm2/Documentation/networking/ip-sysctl.txt 2006-12-01 19:36:51.000000000 +0100
@@ -977,7 +977,6 @@
discovery_slots FIXME
discovery_timeout FIXME
fast_poll_increase FIXME
-ip6_queue_maxlen FIXME
lap_keepalive_time FIXME
lo_cong FIXME
max_baud_rate FIXME
--- linux-2.6.19-rc6-mm2/include/linux/netlink.h.old 2006-12-01 19:36:01.000000000 +0100
+++ linux-2.6.19-rc6-mm2/include/linux/netlink.h 2006-12-01 19:39:11.000000000 +0100
@@ -7,7 +7,7 @@
#define NETLINK_ROUTE 0 /* Routing/device hook */
#define NETLINK_UNUSED 1 /* Unused number */
#define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
-#define NETLINK_FIREWALL 3 /* Firewalling hook */
+/* NETLINK_FIREWALL was 3 Firewalling hook */
#define NETLINK_INET_DIAG 4 /* INET socket monitoring */
#define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
#define NETLINK_XFRM 6 /* ipsec */
@@ -17,7 +17,7 @@
#define NETLINK_FIB_LOOKUP 10
#define NETLINK_CONNECTOR 11
#define NETLINK_NETFILTER 12 /* netfilter subsystem */
-#define NETLINK_IP6_FW 13
+/* NETLINK_IP6_FW was 13 */
#define NETLINK_DNRTMSG 14 /* DECnet routing messages */
#define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
#define NETLINK_GENERIC 16
--- linux-2.6.19-rc6-mm2/security/selinux/hooks.c.old 2006-12-01 19:36:01.000000000 +0100
+++ linux-2.6.19-rc6-mm2/security/selinux/hooks.c 2006-12-01 19:36:51.000000000 +0100
@@ -762,8 +762,6 @@
switch (protocol) {
case NETLINK_ROUTE:
return SECCLASS_NETLINK_ROUTE_SOCKET;
- case NETLINK_FIREWALL:
- return SECCLASS_NETLINK_FIREWALL_SOCKET;
case NETLINK_INET_DIAG:
return SECCLASS_NETLINK_TCPDIAG_SOCKET;
case NETLINK_NFLOG:
@@ -774,8 +772,6 @@
return SECCLASS_NETLINK_SELINUX_SOCKET;
case NETLINK_AUDIT:
return SECCLASS_NETLINK_AUDIT_SOCKET;
- case NETLINK_IP6_FW:
- return SECCLASS_NETLINK_IP6FW_SOCKET;
case NETLINK_DNRTMSG:
return SECCLASS_NETLINK_DNRT_SOCKET;
case NETLINK_KOBJECT_UEVENT:
--- linux-2.6.19-rc6-mm2/security/selinux/nlmsgtab.c.old 2006-12-01 19:36:01.000000000 +0100
+++ linux-2.6.19-rc6-mm2/security/selinux/nlmsgtab.c 2006-12-01 19:36:51.000000000 +0100
@@ -15,7 +15,6 @@
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/if.h>
-#include <linux/netfilter_ipv4/ip_queue.h>
#include <linux/inet_diag.h>
#include <linux/xfrm.h>
#include <linux/audit.h>
@@ -66,12 +65,6 @@
{ RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
};
-static struct nlmsg_perm nlmsg_firewall_perms[] =
-{
- { IPQM_MODE, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
- { IPQM_VERDICT, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
-};
-
static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
{
{ TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
@@ -137,12 +130,6 @@
sizeof(nlmsg_route_perms));
break;
- case SECCLASS_NETLINK_FIREWALL_SOCKET:
- case SECCLASS_NETLINK_IP6FW_SOCKET:
- err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
- sizeof(nlmsg_firewall_perms));
- break;
-
case SECCLASS_NETLINK_TCPDIAG_SOCKET:
err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
sizeof(nlmsg_tcpdiag_perms));
--- linux-2.6.19-rc6-mm2/include/linux/netfilter_ipv4/Kbuild.old 2006-12-01 19:40:10.000000000 +0100
+++ linux-2.6.19-rc6-mm2/include/linux/netfilter_ipv4/Kbuild 2006-12-01 19:40:24.000000000 +0100
@@ -59,5 +59,4 @@
unifdef-y += ip_conntrack_tuple.h
unifdef-y += ip_nat.h
unifdef-y += ip_nat_rule.h
-unifdef-y += ip_queue.h
unifdef-y += ip_tables.h
--- linux-2.6.19-rc6-mm2/net/core/dev.c.old 2006-12-01 19:36:32.000000000 +0100
+++ linux-2.6.19-rc6-mm2/net/core/dev.c 2006-12-01 19:36:43.000000000 +0100
@@ -3560,8 +3560,6 @@
EXPORT_SYMBOL(synchronize_net);
EXPORT_SYMBOL(unregister_netdevice);
EXPORT_SYMBOL(unregister_netdevice_notifier);
-EXPORT_SYMBOL(net_enable_timestamp);
-EXPORT_SYMBOL(net_disable_timestamp);
EXPORT_SYMBOL(dev_get_flags);
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
--- linux-2.6.19-rc6-mm2/include/linux/netfilter_ipv4/ip_queue.h 2006-11-29 04:34:30.000000000 +0100
+++ /dev/null 2006-09-19 00:45:31.000000000 +0200
@@ -1,72 +0,0 @@
-/*
- * This is a module which is used for queueing IPv4 packets and
- * communicating with userspace via netlink.
- *
- * (C) 2000 James Morris, this code is GPL.
- */
-#ifndef _IP_QUEUE_H
-#define _IP_QUEUE_H
-
-#ifdef __KERNEL__
-#ifdef DEBUG_IPQ
-#define QDEBUG(x...) printk(KERN_DEBUG ## x)
-#else
-#define QDEBUG(x...)
-#endif /* DEBUG_IPQ */
-#else
-#include <net/if.h>
-#endif /* ! __KERNEL__ */
-
-/* Messages sent from kernel */
-typedef struct ipq_packet_msg {
- unsigned long packet_id; /* ID of queued packet */
- unsigned long mark; /* Netfilter mark value */
- long timestamp_sec; /* Packet arrival time (seconds) */
- long timestamp_usec; /* Packet arrvial time (+useconds) */
- unsigned int hook; /* Netfilter hook we rode in on */
- char indev_name[IFNAMSIZ]; /* Name of incoming interface */
- char outdev_name[IFNAMSIZ]; /* Name of outgoing interface */
- __be16 hw_protocol; /* Hardware protocol (network order) */
- unsigned short hw_type; /* Hardware type */
- unsigned char hw_addrlen; /* Hardware address length */
- unsigned char hw_addr[8]; /* Hardware address */
- size_t data_len; /* Length of packet data */
- unsigned char payload[0]; /* Optional packet data */
-} ipq_packet_msg_t;
-
-/* Messages sent from userspace */
-typedef struct ipq_mode_msg {
- unsigned char value; /* Requested mode */
- size_t range; /* Optional range of packet requested */
-} ipq_mode_msg_t;
-
-typedef struct ipq_verdict_msg {
- unsigned int value; /* Verdict to hand to netfilter */
- unsigned long id; /* Packet ID for this verdict */
- size_t data_len; /* Length of replacement data */
- unsigned char payload[0]; /* Optional replacement packet */
-} ipq_verdict_msg_t;
-
-typedef struct ipq_peer_msg {
- union {
- ipq_verdict_msg_t verdict;
- ipq_mode_msg_t mode;
- } msg;
-} ipq_peer_msg_t;
-
-/* Packet delivery modes */
-enum {
- IPQ_COPY_NONE, /* Initial mode, packets are dropped */
- IPQ_COPY_META, /* Copy metadata */
- IPQ_COPY_PACKET /* Copy metadata + packet (range) */
-};
-#define IPQ_COPY_MAX IPQ_COPY_PACKET
-
-/* Types of messages */
-#define IPQM_BASE 0x10 /* standard netlink messages below this */
-#define IPQM_MODE (IPQM_BASE + 1) /* Mode request from peer */
-#define IPQM_VERDICT (IPQM_BASE + 2) /* Verdict from peer */
-#define IPQM_PACKET (IPQM_BASE + 3) /* Packet from kernel */
-#define IPQM_MAX (IPQM_BASE + 4)
-
-#endif /*_IP_QUEUE_H*/
--- linux-2.6.19-rc6-mm2/net/ipv4/netfilter/ip_queue.c 2006-11-29 04:35:24.000000000 +0100
+++ /dev/null 2006-09-19 00:45:31.000000000 +0200
@@ -1,742 +0,0 @@
-/*
- * This is a module which is used for queueing IPv4 packets and
- * communicating with userspace via netlink.
- *
- * (C) 2000-2002 James Morris <jmorris@...ercode.com.au>
- * (C) 2003-2005 Netfilter Core Team <coreteam@...filter.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.
- *
- * 2000-03-27: Simplified code (thanks to Andi Kleen for clues).
- * 2000-05-20: Fixed notifier problems (following Miguel Freitas' report).
- * 2000-06-19: Fixed so nfmark is copied to metadata (reported by Sebastian
- * Zander).
- * 2000-08-01: Added Nick Williams' MAC support.
- * 2002-06-25: Code cleanup.
- * 2005-01-10: Added /proc counter for dropped packets; fixed so
- * packets aren't delivered to user space if they're going
- * to be dropped.
- * 2005-05-26: local_bh_{disable,enable} around nf_reinject (Harald Welte)
- *
- */
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/init.h>
-#include <linux/ip.h>
-#include <linux/notifier.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4/ip_queue.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netlink.h>
-#include <linux/spinlock.h>
-#include <linux/sysctl.h>
-#include <linux/proc_fs.h>
-#include <linux/security.h>
-#include <linux/mutex.h>
-#include <net/sock.h>
-#include <net/route.h>
-
-#define IPQ_QMAX_DEFAULT 1024
-#define IPQ_PROC_FS_NAME "ip_queue"
-#define NET_IPQ_QMAX 2088
-#define NET_IPQ_QMAX_NAME "ip_queue_maxlen"
-
-struct ipq_queue_entry {
- struct list_head list;
- struct nf_info *info;
- struct sk_buff *skb;
-};
-
-typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long);
-
-static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE;
-static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT;
-static DEFINE_RWLOCK(queue_lock);
-static int peer_pid __read_mostly;
-static unsigned int copy_range __read_mostly;
-static unsigned int queue_total;
-static unsigned int queue_dropped = 0;
-static unsigned int queue_user_dropped = 0;
-static struct sock *ipqnl __read_mostly;
-static LIST_HEAD(queue_list);
-static DEFINE_MUTEX(ipqnl_mutex);
-
-static void
-ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict)
-{
- /* TCP input path (and probably other bits) assume to be called
- * from softirq context, not from syscall, like ipq_issue_verdict is
- * called. TCP input path deadlocks with locks taken from timer
- * softirq, e.g. We therefore emulate this by local_bh_disable() */
-
- local_bh_disable();
- nf_reinject(entry->skb, entry->info, verdict);
- local_bh_enable();
-
- kfree(entry);
-}
-
-static inline void
-__ipq_enqueue_entry(struct ipq_queue_entry *entry)
-{
- list_add(&entry->list, &queue_list);
- queue_total++;
-}
-
-/*
- * Find and return a queued entry matched by cmpfn, or return the last
- * entry if cmpfn is NULL.
- */
-static inline struct ipq_queue_entry *
-__ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data)
-{
- struct list_head *p;
-
- list_for_each_prev(p, &queue_list) {
- struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p;
-
- if (!cmpfn || cmpfn(entry, data))
- return entry;
- }
- return NULL;
-}
-
-static inline void
-__ipq_dequeue_entry(struct ipq_queue_entry *entry)
-{
- list_del(&entry->list);
- queue_total--;
-}
-
-static inline struct ipq_queue_entry *
-__ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
-{
- struct ipq_queue_entry *entry;
-
- entry = __ipq_find_entry(cmpfn, data);
- if (entry == NULL)
- return NULL;
-
- __ipq_dequeue_entry(entry);
- return entry;
-}
-
-
-static inline void
-__ipq_flush(int verdict)
-{
- struct ipq_queue_entry *entry;
-
- while ((entry = __ipq_find_dequeue_entry(NULL, 0)))
- ipq_issue_verdict(entry, verdict);
-}
-
-static inline int
-__ipq_set_mode(unsigned char mode, unsigned int range)
-{
- int status = 0;
-
- switch(mode) {
- case IPQ_COPY_NONE:
- case IPQ_COPY_META:
- copy_mode = mode;
- copy_range = 0;
- break;
-
- case IPQ_COPY_PACKET:
- copy_mode = mode;
- copy_range = range;
- if (copy_range > 0xFFFF)
- copy_range = 0xFFFF;
- break;
-
- default:
- status = -EINVAL;
-
- }
- return status;
-}
-
-static inline void
-__ipq_reset(void)
-{
- peer_pid = 0;
- net_disable_timestamp();
- __ipq_set_mode(IPQ_COPY_NONE, 0);
- __ipq_flush(NF_DROP);
-}
-
-static struct ipq_queue_entry *
-ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
-{
- struct ipq_queue_entry *entry;
-
- write_lock_bh(&queue_lock);
- entry = __ipq_find_dequeue_entry(cmpfn, data);
- write_unlock_bh(&queue_lock);
- return entry;
-}
-
-static void
-ipq_flush(int verdict)
-{
- write_lock_bh(&queue_lock);
- __ipq_flush(verdict);
- write_unlock_bh(&queue_lock);
-}
-
-static struct sk_buff *
-ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
-{
- unsigned char *old_tail;
- size_t size = 0;
- size_t data_len = 0;
- struct sk_buff *skb;
- struct ipq_packet_msg *pmsg;
- struct nlmsghdr *nlh;
-
- read_lock_bh(&queue_lock);
-
- switch (copy_mode) {
- case IPQ_COPY_META:
- case IPQ_COPY_NONE:
- size = NLMSG_SPACE(sizeof(*pmsg));
- data_len = 0;
- break;
-
- case IPQ_COPY_PACKET:
- if ((entry->skb->ip_summed == CHECKSUM_PARTIAL ||
- entry->skb->ip_summed == CHECKSUM_COMPLETE) &&
- (*errp = skb_checksum_help(entry->skb))) {
- read_unlock_bh(&queue_lock);
- return NULL;
- }
- if (copy_range == 0 || copy_range > entry->skb->len)
- data_len = entry->skb->len;
- else
- data_len = copy_range;
-
- size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
- break;
-
- default:
- *errp = -EINVAL;
- read_unlock_bh(&queue_lock);
- return NULL;
- }
-
- read_unlock_bh(&queue_lock);
-
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb)
- goto nlmsg_failure;
-
- old_tail= skb->tail;
- nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
- pmsg = NLMSG_DATA(nlh);
- memset(pmsg, 0, sizeof(*pmsg));
-
- pmsg->packet_id = (unsigned long )entry;
- pmsg->data_len = data_len;
- pmsg->timestamp_sec = entry->skb->tstamp.off_sec;
- pmsg->timestamp_usec = entry->skb->tstamp.off_usec;
- pmsg->mark = entry->skb->mark;
- pmsg->hook = entry->info->hook;
- pmsg->hw_protocol = entry->skb->protocol;
-
- if (entry->info->indev)
- strcpy(pmsg->indev_name, entry->info->indev->name);
- else
- pmsg->indev_name[0] = '\0';
-
- if (entry->info->outdev)
- strcpy(pmsg->outdev_name, entry->info->outdev->name);
- else
- pmsg->outdev_name[0] = '\0';
-
- if (entry->info->indev && entry->skb->dev) {
- pmsg->hw_type = entry->skb->dev->type;
- if (entry->skb->dev->hard_header_parse)
- pmsg->hw_addrlen =
- entry->skb->dev->hard_header_parse(entry->skb,
- pmsg->hw_addr);
- }
-
- if (data_len)
- if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
- BUG();
-
- nlh->nlmsg_len = skb->tail - old_tail;
- return skb;
-
-nlmsg_failure:
- if (skb)
- kfree_skb(skb);
- *errp = -EINVAL;
- printk(KERN_ERR "ip_queue: error creating packet message\n");
- return NULL;
-}
-
-static int
-ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info,
- unsigned int queuenum, void *data)
-{
- int status = -EINVAL;
- struct sk_buff *nskb;
- struct ipq_queue_entry *entry;
-
- if (copy_mode == IPQ_COPY_NONE)
- return -EAGAIN;
-
- entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
- if (entry == NULL) {
- printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n");
- return -ENOMEM;
- }
-
- entry->info = info;
- entry->skb = skb;
-
- nskb = ipq_build_packet_message(entry, &status);
- if (nskb == NULL)
- goto err_out_free;
-
- write_lock_bh(&queue_lock);
-
- if (!peer_pid)
- goto err_out_free_nskb;
-
- if (queue_total >= queue_maxlen) {
- queue_dropped++;
- status = -ENOSPC;
- if (net_ratelimit())
- printk (KERN_WARNING "ip_queue: full at %d entries, "
- "dropping packets(s). Dropped: %d\n", queue_total,
- queue_dropped);
- goto err_out_free_nskb;
- }
-
- /* netlink_unicast will either free the nskb or attach it to a socket */
- status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
- if (status < 0) {
- queue_user_dropped++;
- goto err_out_unlock;
- }
-
- __ipq_enqueue_entry(entry);
-
- write_unlock_bh(&queue_lock);
- return status;
-
-err_out_free_nskb:
- kfree_skb(nskb);
-
-err_out_unlock:
- write_unlock_bh(&queue_lock);
-
-err_out_free:
- kfree(entry);
- return status;
-}
-
-static int
-ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
-{
- int diff;
- struct iphdr *user_iph = (struct iphdr *)v->payload;
-
- if (v->data_len < sizeof(*user_iph))
- return 0;
- diff = v->data_len - e->skb->len;
- if (diff < 0) {
- if (pskb_trim(e->skb, v->data_len))
- return -ENOMEM;
- } else if (diff > 0) {
- if (v->data_len > 0xFFFF)
- return -EINVAL;
- if (diff > skb_tailroom(e->skb)) {
- struct sk_buff *newskb;
-
- newskb = skb_copy_expand(e->skb,
- skb_headroom(e->skb),
- diff,
- GFP_ATOMIC);
- if (newskb == NULL) {
- printk(KERN_WARNING "ip_queue: OOM "
- "in mangle, dropping packet\n");
- return -ENOMEM;
- }
- if (e->skb->sk)
- skb_set_owner_w(newskb, e->skb->sk);
- kfree_skb(e->skb);
- e->skb = newskb;
- }
- skb_put(e->skb, diff);
- }
- if (!skb_make_writable(&e->skb, v->data_len))
- return -ENOMEM;
- memcpy(e->skb->data, v->payload, v->data_len);
- e->skb->ip_summed = CHECKSUM_NONE;
-
- return 0;
-}
-
-static inline int
-id_cmp(struct ipq_queue_entry *e, unsigned long id)
-{
- return (id == (unsigned long )e);
-}
-
-static int
-ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
-{
- struct ipq_queue_entry *entry;
-
- if (vmsg->value > NF_MAX_VERDICT)
- return -EINVAL;
-
- entry = ipq_find_dequeue_entry(id_cmp, vmsg->id);
- if (entry == NULL)
- return -ENOENT;
- else {
- int verdict = vmsg->value;
-
- if (vmsg->data_len && vmsg->data_len == len)
- if (ipq_mangle_ipv4(vmsg, entry) < 0)
- verdict = NF_DROP;
-
- ipq_issue_verdict(entry, verdict);
- return 0;
- }
-}
-
-static int
-ipq_set_mode(unsigned char mode, unsigned int range)
-{
- int status;
-
- write_lock_bh(&queue_lock);
- status = __ipq_set_mode(mode, range);
- write_unlock_bh(&queue_lock);
- return status;
-}
-
-static int
-ipq_receive_peer(struct ipq_peer_msg *pmsg,
- unsigned char type, unsigned int len)
-{
- int status = 0;
-
- if (len < sizeof(*pmsg))
- return -EINVAL;
-
- switch (type) {
- case IPQM_MODE:
- status = ipq_set_mode(pmsg->msg.mode.value,
- pmsg->msg.mode.range);
- break;
-
- case IPQM_VERDICT:
- if (pmsg->msg.verdict.value > NF_MAX_VERDICT)
- status = -EINVAL;
- else
- status = ipq_set_verdict(&pmsg->msg.verdict,
- len - sizeof(*pmsg));
- break;
- default:
- status = -EINVAL;
- }
- return status;
-}
-
-static int
-dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex)
-{
- if (entry->info->indev)
- if (entry->info->indev->ifindex == ifindex)
- return 1;
- if (entry->info->outdev)
- if (entry->info->outdev->ifindex == ifindex)
- return 1;
-#ifdef CONFIG_BRIDGE_NETFILTER
- if (entry->skb->nf_bridge) {
- if (entry->skb->nf_bridge->physindev &&
- entry->skb->nf_bridge->physindev->ifindex == ifindex)
- return 1;
- if (entry->skb->nf_bridge->physoutdev &&
- entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
- return 1;
- }
-#endif
- return 0;
-}
-
-static void
-ipq_dev_drop(int ifindex)
-{
- struct ipq_queue_entry *entry;
-
- while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL)
- ipq_issue_verdict(entry, NF_DROP);
-}
-
-#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
-
-static inline void
-ipq_rcv_skb(struct sk_buff *skb)
-{
- int status, type, pid, flags, nlmsglen, skblen;
- struct nlmsghdr *nlh;
-
- skblen = skb->len;
- if (skblen < sizeof(*nlh))
- return;
-
- nlh = (struct nlmsghdr *)skb->data;
- nlmsglen = nlh->nlmsg_len;
- if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
- return;
-
- pid = nlh->nlmsg_pid;
- flags = nlh->nlmsg_flags;
-
- if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
- RCV_SKB_FAIL(-EINVAL);
-
- if (flags & MSG_TRUNC)
- RCV_SKB_FAIL(-ECOMM);
-
- type = nlh->nlmsg_type;
- if (type < NLMSG_NOOP || type >= IPQM_MAX)
- RCV_SKB_FAIL(-EINVAL);
-
- if (type <= IPQM_BASE)
- return;
-
- if (security_netlink_recv(skb, CAP_NET_ADMIN))
- RCV_SKB_FAIL(-EPERM);
-
- write_lock_bh(&queue_lock);
-
- if (peer_pid) {
- if (peer_pid != pid) {
- write_unlock_bh(&queue_lock);
- RCV_SKB_FAIL(-EBUSY);
- }
- } else {
- net_enable_timestamp();
- peer_pid = pid;
- }
-
- write_unlock_bh(&queue_lock);
-
- status = ipq_receive_peer(NLMSG_DATA(nlh), type,
- nlmsglen - NLMSG_LENGTH(0));
- if (status < 0)
- RCV_SKB_FAIL(status);
-
- if (flags & NLM_F_ACK)
- netlink_ack(skb, nlh, 0);
- return;
-}
-
-static void
-ipq_rcv_sk(struct sock *sk, int len)
-{
- struct sk_buff *skb;
- unsigned int qlen;
-
- mutex_lock(&ipqnl_mutex);
-
- for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) {
- skb = skb_dequeue(&sk->sk_receive_queue);
- ipq_rcv_skb(skb);
- kfree_skb(skb);
- }
-
- mutex_unlock(&ipqnl_mutex);
-}
-
-static int
-ipq_rcv_dev_event(struct notifier_block *this,
- unsigned long event, void *ptr)
-{
- struct net_device *dev = ptr;
-
- /* Drop any packets associated with the downed device */
- if (event == NETDEV_DOWN)
- ipq_dev_drop(dev->ifindex);
- return NOTIFY_DONE;
-}
-
-static struct notifier_block ipq_dev_notifier = {
- .notifier_call = ipq_rcv_dev_event,
-};
-
-static int
-ipq_rcv_nl_event(struct notifier_block *this,
- unsigned long event, void *ptr)
-{
- struct netlink_notify *n = ptr;
-
- if (event == NETLINK_URELEASE &&
- n->protocol == NETLINK_FIREWALL && n->pid) {
- write_lock_bh(&queue_lock);
- if (n->pid == peer_pid)
- __ipq_reset();
- write_unlock_bh(&queue_lock);
- }
- return NOTIFY_DONE;
-}
-
-static struct notifier_block ipq_nl_notifier = {
- .notifier_call = ipq_rcv_nl_event,
-};
-
-static struct ctl_table_header *ipq_sysctl_header;
-
-static ctl_table ipq_table[] = {
- {
- .ctl_name = NET_IPQ_QMAX,
- .procname = NET_IPQ_QMAX_NAME,
- .data = &queue_maxlen,
- .maxlen = sizeof(queue_maxlen),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ipq_dir_table[] = {
- {
- .ctl_name = NET_IPV4,
- .procname = "ipv4",
- .mode = 0555,
- .child = ipq_table
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ipq_root_table[] = {
- {
- .ctl_name = CTL_NET,
- .procname = "net",
- .mode = 0555,
- .child = ipq_dir_table
- },
- { .ctl_name = 0 }
-};
-
-#ifdef CONFIG_PROC_FS
-static int
-ipq_get_info(char *buffer, char **start, off_t offset, int length)
-{
- int len;
-
- read_lock_bh(&queue_lock);
-
- len = sprintf(buffer,
- "Peer PID : %d\n"
- "Copy mode : %hu\n"
- "Copy range : %u\n"
- "Queue length : %u\n"
- "Queue max. length : %u\n"
- "Queue dropped : %u\n"
- "Netlink dropped : %u\n",
- peer_pid,
- copy_mode,
- copy_range,
- queue_total,
- queue_maxlen,
- queue_dropped,
- queue_user_dropped);
-
- read_unlock_bh(&queue_lock);
-
- *start = buffer + offset;
- len -= offset;
- if (len > length)
- len = length;
- else if (len < 0)
- len = 0;
- return len;
-}
-#endif /* CONFIG_PROC_FS */
-
-static struct nf_queue_handler nfqh = {
- .name = "ip_queue",
- .outfn = &ipq_enqueue_packet,
-};
-
-static int __init ip_queue_init(void)
-{
- int status = -ENOMEM;
- struct proc_dir_entry *proc;
-
- netlink_register_notifier(&ipq_nl_notifier);
- ipqnl = netlink_kernel_create(NETLINK_FIREWALL, 0, ipq_rcv_sk,
- THIS_MODULE);
- if (ipqnl == NULL) {
- printk(KERN_ERR "ip_queue: failed to create netlink socket\n");
- goto cleanup_netlink_notifier;
- }
-
- proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info);
- if (proc)
- proc->owner = THIS_MODULE;
- else {
- printk(KERN_ERR "ip_queue: failed to create proc entry\n");
- goto cleanup_ipqnl;
- }
-
- register_netdevice_notifier(&ipq_dev_notifier);
- ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0);
-
- status = nf_register_queue_handler(PF_INET, &nfqh);
- if (status < 0) {
- printk(KERN_ERR "ip_queue: failed to register queue handler\n");
- goto cleanup_sysctl;
- }
- return status;
-
-cleanup_sysctl:
- unregister_sysctl_table(ipq_sysctl_header);
- unregister_netdevice_notifier(&ipq_dev_notifier);
- proc_net_remove(IPQ_PROC_FS_NAME);
-
-cleanup_ipqnl:
- sock_release(ipqnl->sk_socket);
- mutex_lock(&ipqnl_mutex);
- mutex_unlock(&ipqnl_mutex);
-
-cleanup_netlink_notifier:
- netlink_unregister_notifier(&ipq_nl_notifier);
- return status;
-}
-
-static void __exit ip_queue_fini(void)
-{
- nf_unregister_queue_handlers(&nfqh);
- synchronize_net();
- ipq_flush(NF_DROP);
-
- unregister_sysctl_table(ipq_sysctl_header);
- unregister_netdevice_notifier(&ipq_dev_notifier);
- proc_net_remove(IPQ_PROC_FS_NAME);
-
- sock_release(ipqnl->sk_socket);
- mutex_lock(&ipqnl_mutex);
- mutex_unlock(&ipqnl_mutex);
-
- netlink_unregister_notifier(&ipq_nl_notifier);
-}
-
-MODULE_DESCRIPTION("IPv4 packet queue handler");
-MODULE_AUTHOR("James Morris <jmorris@...ercode.com.au>");
-MODULE_LICENSE("GPL");
-
-module_init(ip_queue_init);
-module_exit(ip_queue_fini);
--- linux-2.6.19-rc6-mm2/net/ipv6/netfilter/ip6_queue.c 2006-11-29 04:35:24.000000000 +0100
+++ /dev/null 2006-09-19 00:45:31.000000000 +0200
@@ -1,729 +0,0 @@
-/*
- * This is a module which is used for queueing IPv6 packets and
- * communicating with userspace via netlink.
- *
- * (C) 2001 Fernando Anton, this code is GPL.
- * IPv64 Project - Work based in IPv64 draft by Arturo Azcorra.
- * Universidad Carlos III de Madrid - Leganes (Madrid) - Spain
- * Universidad Politecnica de Alcala de Henares - Alcala de H. (Madrid) - Spain
- * email: fanton@...uc3m.es
- *
- * 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.
- *
- * 2001-11-06: First try. Working with ip_queue.c for IPv4 and trying
- * to adapt it to IPv6
- * HEAVILY based in ipqueue.c by James Morris. It's just
- * a little modified version of it, so he's nearly the
- * real coder of this.
- * Few changes needed, mainly the hard_routing code and
- * the netlink socket protocol (we're NETLINK_IP6_FW).
- * 2002-06-25: Code cleanup. [JM: ported cleanup over from ip_queue.c]
- * 2005-02-04: Added /proc counter for dropped packets; fixed so
- * packets aren't delivered to user space if they're going
- * to be dropped.
- */
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/init.h>
-#include <linux/ipv6.h>
-#include <linux/notifier.h>
-#include <linux/netdevice.h>
-#include <linux/netfilter.h>
-#include <linux/netlink.h>
-#include <linux/spinlock.h>
-#include <linux/sysctl.h>
-#include <linux/proc_fs.h>
-#include <linux/mutex.h>
-#include <net/sock.h>
-#include <net/ipv6.h>
-#include <net/ip6_route.h>
-#include <linux/netfilter_ipv4/ip_queue.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
-#include <linux/netfilter_ipv6/ip6_tables.h>
-
-#define IPQ_QMAX_DEFAULT 1024
-#define IPQ_PROC_FS_NAME "ip6_queue"
-#define NET_IPQ_QMAX 2088
-#define NET_IPQ_QMAX_NAME "ip6_queue_maxlen"
-
-struct ipq_queue_entry {
- struct list_head list;
- struct nf_info *info;
- struct sk_buff *skb;
-};
-
-typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long);
-
-static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE;
-static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT;
-static DEFINE_RWLOCK(queue_lock);
-static int peer_pid __read_mostly;
-static unsigned int copy_range __read_mostly;
-static unsigned int queue_total;
-static unsigned int queue_dropped = 0;
-static unsigned int queue_user_dropped = 0;
-static struct sock *ipqnl __read_mostly;
-static LIST_HEAD(queue_list);
-static DEFINE_MUTEX(ipqnl_mutex);
-
-static void
-ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict)
-{
- local_bh_disable();
- nf_reinject(entry->skb, entry->info, verdict);
- local_bh_enable();
- kfree(entry);
-}
-
-static inline void
-__ipq_enqueue_entry(struct ipq_queue_entry *entry)
-{
- list_add(&entry->list, &queue_list);
- queue_total++;
-}
-
-/*
- * Find and return a queued entry matched by cmpfn, or return the last
- * entry if cmpfn is NULL.
- */
-static inline struct ipq_queue_entry *
-__ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data)
-{
- struct list_head *p;
-
- list_for_each_prev(p, &queue_list) {
- struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p;
-
- if (!cmpfn || cmpfn(entry, data))
- return entry;
- }
- return NULL;
-}
-
-static inline void
-__ipq_dequeue_entry(struct ipq_queue_entry *entry)
-{
- list_del(&entry->list);
- queue_total--;
-}
-
-static inline struct ipq_queue_entry *
-__ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
-{
- struct ipq_queue_entry *entry;
-
- entry = __ipq_find_entry(cmpfn, data);
- if (entry == NULL)
- return NULL;
-
- __ipq_dequeue_entry(entry);
- return entry;
-}
-
-
-static inline void
-__ipq_flush(int verdict)
-{
- struct ipq_queue_entry *entry;
-
- while ((entry = __ipq_find_dequeue_entry(NULL, 0)))
- ipq_issue_verdict(entry, verdict);
-}
-
-static inline int
-__ipq_set_mode(unsigned char mode, unsigned int range)
-{
- int status = 0;
-
- switch(mode) {
- case IPQ_COPY_NONE:
- case IPQ_COPY_META:
- copy_mode = mode;
- copy_range = 0;
- break;
-
- case IPQ_COPY_PACKET:
- copy_mode = mode;
- copy_range = range;
- if (copy_range > 0xFFFF)
- copy_range = 0xFFFF;
- break;
-
- default:
- status = -EINVAL;
-
- }
- return status;
-}
-
-static inline void
-__ipq_reset(void)
-{
- peer_pid = 0;
- net_disable_timestamp();
- __ipq_set_mode(IPQ_COPY_NONE, 0);
- __ipq_flush(NF_DROP);
-}
-
-static struct ipq_queue_entry *
-ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
-{
- struct ipq_queue_entry *entry;
-
- write_lock_bh(&queue_lock);
- entry = __ipq_find_dequeue_entry(cmpfn, data);
- write_unlock_bh(&queue_lock);
- return entry;
-}
-
-static void
-ipq_flush(int verdict)
-{
- write_lock_bh(&queue_lock);
- __ipq_flush(verdict);
- write_unlock_bh(&queue_lock);
-}
-
-static struct sk_buff *
-ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
-{
- unsigned char *old_tail;
- size_t size = 0;
- size_t data_len = 0;
- struct sk_buff *skb;
- struct ipq_packet_msg *pmsg;
- struct nlmsghdr *nlh;
-
- read_lock_bh(&queue_lock);
-
- switch (copy_mode) {
- case IPQ_COPY_META:
- case IPQ_COPY_NONE:
- size = NLMSG_SPACE(sizeof(*pmsg));
- data_len = 0;
- break;
-
- case IPQ_COPY_PACKET:
- if ((entry->skb->ip_summed == CHECKSUM_PARTIAL ||
- entry->skb->ip_summed == CHECKSUM_COMPLETE) &&
- (*errp = skb_checksum_help(entry->skb))) {
- read_unlock_bh(&queue_lock);
- return NULL;
- }
- if (copy_range == 0 || copy_range > entry->skb->len)
- data_len = entry->skb->len;
- else
- data_len = copy_range;
-
- size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
- break;
-
- default:
- *errp = -EINVAL;
- read_unlock_bh(&queue_lock);
- return NULL;
- }
-
- read_unlock_bh(&queue_lock);
-
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb)
- goto nlmsg_failure;
-
- old_tail= skb->tail;
- nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
- pmsg = NLMSG_DATA(nlh);
- memset(pmsg, 0, sizeof(*pmsg));
-
- pmsg->packet_id = (unsigned long )entry;
- pmsg->data_len = data_len;
- pmsg->timestamp_sec = entry->skb->tstamp.off_sec;
- pmsg->timestamp_usec = entry->skb->tstamp.off_usec;
- pmsg->mark = entry->skb->mark;
- pmsg->hook = entry->info->hook;
- pmsg->hw_protocol = entry->skb->protocol;
-
- if (entry->info->indev)
- strcpy(pmsg->indev_name, entry->info->indev->name);
- else
- pmsg->indev_name[0] = '\0';
-
- if (entry->info->outdev)
- strcpy(pmsg->outdev_name, entry->info->outdev->name);
- else
- pmsg->outdev_name[0] = '\0';
-
- if (entry->info->indev && entry->skb->dev) {
- pmsg->hw_type = entry->skb->dev->type;
- if (entry->skb->dev->hard_header_parse)
- pmsg->hw_addrlen =
- entry->skb->dev->hard_header_parse(entry->skb,
- pmsg->hw_addr);
- }
-
- if (data_len)
- if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
- BUG();
-
- nlh->nlmsg_len = skb->tail - old_tail;
- return skb;
-
-nlmsg_failure:
- if (skb)
- kfree_skb(skb);
- *errp = -EINVAL;
- printk(KERN_ERR "ip6_queue: error creating packet message\n");
- return NULL;
-}
-
-static int
-ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info,
- unsigned int queuenum, void *data)
-{
- int status = -EINVAL;
- struct sk_buff *nskb;
- struct ipq_queue_entry *entry;
-
- if (copy_mode == IPQ_COPY_NONE)
- return -EAGAIN;
-
- entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
- if (entry == NULL) {
- printk(KERN_ERR "ip6_queue: OOM in ipq_enqueue_packet()\n");
- return -ENOMEM;
- }
-
- entry->info = info;
- entry->skb = skb;
-
- nskb = ipq_build_packet_message(entry, &status);
- if (nskb == NULL)
- goto err_out_free;
-
- write_lock_bh(&queue_lock);
-
- if (!peer_pid)
- goto err_out_free_nskb;
-
- if (queue_total >= queue_maxlen) {
- queue_dropped++;
- status = -ENOSPC;
- if (net_ratelimit())
- printk (KERN_WARNING "ip6_queue: fill at %d entries, "
- "dropping packet(s). Dropped: %d\n", queue_total,
- queue_dropped);
- goto err_out_free_nskb;
- }
-
- /* netlink_unicast will either free the nskb or attach it to a socket */
- status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
- if (status < 0) {
- queue_user_dropped++;
- goto err_out_unlock;
- }
-
- __ipq_enqueue_entry(entry);
-
- write_unlock_bh(&queue_lock);
- return status;
-
-err_out_free_nskb:
- kfree_skb(nskb);
-
-err_out_unlock:
- write_unlock_bh(&queue_lock);
-
-err_out_free:
- kfree(entry);
- return status;
-}
-
-static int
-ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
-{
- int diff;
- struct ipv6hdr *user_iph = (struct ipv6hdr *)v->payload;
-
- if (v->data_len < sizeof(*user_iph))
- return 0;
- diff = v->data_len - e->skb->len;
- if (diff < 0) {
- if (pskb_trim(e->skb, v->data_len))
- return -ENOMEM;
- } else if (diff > 0) {
- if (v->data_len > 0xFFFF)
- return -EINVAL;
- if (diff > skb_tailroom(e->skb)) {
- struct sk_buff *newskb;
-
- newskb = skb_copy_expand(e->skb,
- skb_headroom(e->skb),
- diff,
- GFP_ATOMIC);
- if (newskb == NULL) {
- printk(KERN_WARNING "ip6_queue: OOM "
- "in mangle, dropping packet\n");
- return -ENOMEM;
- }
- if (e->skb->sk)
- skb_set_owner_w(newskb, e->skb->sk);
- kfree_skb(e->skb);
- e->skb = newskb;
- }
- skb_put(e->skb, diff);
- }
- if (!skb_make_writable(&e->skb, v->data_len))
- return -ENOMEM;
- memcpy(e->skb->data, v->payload, v->data_len);
- e->skb->ip_summed = CHECKSUM_NONE;
-
- return 0;
-}
-
-static inline int
-id_cmp(struct ipq_queue_entry *e, unsigned long id)
-{
- return (id == (unsigned long )e);
-}
-
-static int
-ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
-{
- struct ipq_queue_entry *entry;
-
- if (vmsg->value > NF_MAX_VERDICT)
- return -EINVAL;
-
- entry = ipq_find_dequeue_entry(id_cmp, vmsg->id);
- if (entry == NULL)
- return -ENOENT;
- else {
- int verdict = vmsg->value;
-
- if (vmsg->data_len && vmsg->data_len == len)
- if (ipq_mangle_ipv6(vmsg, entry) < 0)
- verdict = NF_DROP;
-
- ipq_issue_verdict(entry, verdict);
- return 0;
- }
-}
-
-static int
-ipq_set_mode(unsigned char mode, unsigned int range)
-{
- int status;
-
- write_lock_bh(&queue_lock);
- status = __ipq_set_mode(mode, range);
- write_unlock_bh(&queue_lock);
- return status;
-}
-
-static int
-ipq_receive_peer(struct ipq_peer_msg *pmsg,
- unsigned char type, unsigned int len)
-{
- int status = 0;
-
- if (len < sizeof(*pmsg))
- return -EINVAL;
-
- switch (type) {
- case IPQM_MODE:
- status = ipq_set_mode(pmsg->msg.mode.value,
- pmsg->msg.mode.range);
- break;
-
- case IPQM_VERDICT:
- if (pmsg->msg.verdict.value > NF_MAX_VERDICT)
- status = -EINVAL;
- else
- status = ipq_set_verdict(&pmsg->msg.verdict,
- len - sizeof(*pmsg));
- break;
- default:
- status = -EINVAL;
- }
- return status;
-}
-
-static int
-dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex)
-{
- if (entry->info->indev)
- if (entry->info->indev->ifindex == ifindex)
- return 1;
-
- if (entry->info->outdev)
- if (entry->info->outdev->ifindex == ifindex)
- return 1;
-
- return 0;
-}
-
-static void
-ipq_dev_drop(int ifindex)
-{
- struct ipq_queue_entry *entry;
-
- while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL)
- ipq_issue_verdict(entry, NF_DROP);
-}
-
-#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
-
-static inline void
-ipq_rcv_skb(struct sk_buff *skb)
-{
- int status, type, pid, flags, nlmsglen, skblen;
- struct nlmsghdr *nlh;
-
- skblen = skb->len;
- if (skblen < sizeof(*nlh))
- return;
-
- nlh = (struct nlmsghdr *)skb->data;
- nlmsglen = nlh->nlmsg_len;
- if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
- return;
-
- pid = nlh->nlmsg_pid;
- flags = nlh->nlmsg_flags;
-
- if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
- RCV_SKB_FAIL(-EINVAL);
-
- if (flags & MSG_TRUNC)
- RCV_SKB_FAIL(-ECOMM);
-
- type = nlh->nlmsg_type;
- if (type < NLMSG_NOOP || type >= IPQM_MAX)
- RCV_SKB_FAIL(-EINVAL);
-
- if (type <= IPQM_BASE)
- return;
-
- if (security_netlink_recv(skb, CAP_NET_ADMIN))
- RCV_SKB_FAIL(-EPERM);
-
- write_lock_bh(&queue_lock);
-
- if (peer_pid) {
- if (peer_pid != pid) {
- write_unlock_bh(&queue_lock);
- RCV_SKB_FAIL(-EBUSY);
- }
- } else {
- net_enable_timestamp();
- peer_pid = pid;
- }
-
- write_unlock_bh(&queue_lock);
-
- status = ipq_receive_peer(NLMSG_DATA(nlh), type,
- nlmsglen - NLMSG_LENGTH(0));
- if (status < 0)
- RCV_SKB_FAIL(status);
-
- if (flags & NLM_F_ACK)
- netlink_ack(skb, nlh, 0);
- return;
-}
-
-static void
-ipq_rcv_sk(struct sock *sk, int len)
-{
- struct sk_buff *skb;
- unsigned int qlen;
-
- mutex_lock(&ipqnl_mutex);
-
- for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) {
- skb = skb_dequeue(&sk->sk_receive_queue);
- ipq_rcv_skb(skb);
- kfree_skb(skb);
- }
-
- mutex_unlock(&ipqnl_mutex);
-}
-
-static int
-ipq_rcv_dev_event(struct notifier_block *this,
- unsigned long event, void *ptr)
-{
- struct net_device *dev = ptr;
-
- /* Drop any packets associated with the downed device */
- if (event == NETDEV_DOWN)
- ipq_dev_drop(dev->ifindex);
- return NOTIFY_DONE;
-}
-
-static struct notifier_block ipq_dev_notifier = {
- .notifier_call = ipq_rcv_dev_event,
-};
-
-static int
-ipq_rcv_nl_event(struct notifier_block *this,
- unsigned long event, void *ptr)
-{
- struct netlink_notify *n = ptr;
-
- if (event == NETLINK_URELEASE &&
- n->protocol == NETLINK_IP6_FW && n->pid) {
- write_lock_bh(&queue_lock);
- if (n->pid == peer_pid)
- __ipq_reset();
- write_unlock_bh(&queue_lock);
- }
- return NOTIFY_DONE;
-}
-
-static struct notifier_block ipq_nl_notifier = {
- .notifier_call = ipq_rcv_nl_event,
-};
-
-static struct ctl_table_header *ipq_sysctl_header;
-
-static ctl_table ipq_table[] = {
- {
- .ctl_name = NET_IPQ_QMAX,
- .procname = NET_IPQ_QMAX_NAME,
- .data = &queue_maxlen,
- .maxlen = sizeof(queue_maxlen),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ipq_dir_table[] = {
- {
- .ctl_name = NET_IPV6,
- .procname = "ipv6",
- .mode = 0555,
- .child = ipq_table
- },
- { .ctl_name = 0 }
-};
-
-static ctl_table ipq_root_table[] = {
- {
- .ctl_name = CTL_NET,
- .procname = "net",
- .mode = 0555,
- .child = ipq_dir_table
- },
- { .ctl_name = 0 }
-};
-
-static int
-ipq_get_info(char *buffer, char **start, off_t offset, int length)
-{
- int len;
-
- read_lock_bh(&queue_lock);
-
- len = sprintf(buffer,
- "Peer PID : %d\n"
- "Copy mode : %hu\n"
- "Copy range : %u\n"
- "Queue length : %u\n"
- "Queue max. length : %u\n"
- "Queue dropped : %u\n"
- "Netfilter dropped : %u\n",
- peer_pid,
- copy_mode,
- copy_range,
- queue_total,
- queue_maxlen,
- queue_dropped,
- queue_user_dropped);
-
- read_unlock_bh(&queue_lock);
-
- *start = buffer + offset;
- len -= offset;
- if (len > length)
- len = length;
- else if (len < 0)
- len = 0;
- return len;
-}
-
-static struct nf_queue_handler nfqh = {
- .name = "ip6_queue",
- .outfn = &ipq_enqueue_packet,
-};
-
-static int __init ip6_queue_init(void)
-{
- int status = -ENOMEM;
- struct proc_dir_entry *proc;
-
- netlink_register_notifier(&ipq_nl_notifier);
- ipqnl = netlink_kernel_create(NETLINK_IP6_FW, 0, ipq_rcv_sk,
- THIS_MODULE);
- if (ipqnl == NULL) {
- printk(KERN_ERR "ip6_queue: failed to create netlink socket\n");
- goto cleanup_netlink_notifier;
- }
-
- proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info);
- if (proc)
- proc->owner = THIS_MODULE;
- else {
- printk(KERN_ERR "ip6_queue: failed to create proc entry\n");
- goto cleanup_ipqnl;
- }
-
- register_netdevice_notifier(&ipq_dev_notifier);
- ipq_sysctl_header = register_sysctl_table(ipq_root_table, 0);
-
- status = nf_register_queue_handler(PF_INET6, &nfqh);
- if (status < 0) {
- printk(KERN_ERR "ip6_queue: failed to register queue handler\n");
- goto cleanup_sysctl;
- }
- return status;
-
-cleanup_sysctl:
- unregister_sysctl_table(ipq_sysctl_header);
- unregister_netdevice_notifier(&ipq_dev_notifier);
- proc_net_remove(IPQ_PROC_FS_NAME);
-
-cleanup_ipqnl:
- sock_release(ipqnl->sk_socket);
- mutex_lock(&ipqnl_mutex);
- mutex_unlock(&ipqnl_mutex);
-
-cleanup_netlink_notifier:
- netlink_unregister_notifier(&ipq_nl_notifier);
- return status;
-}
-
-static void __exit ip6_queue_fini(void)
-{
- nf_unregister_queue_handlers(&nfqh);
- synchronize_net();
- ipq_flush(NF_DROP);
-
- unregister_sysctl_table(ipq_sysctl_header);
- unregister_netdevice_notifier(&ipq_dev_notifier);
- proc_net_remove(IPQ_PROC_FS_NAME);
-
- sock_release(ipqnl->sk_socket);
- mutex_lock(&ipqnl_mutex);
- mutex_unlock(&ipqnl_mutex);
-
- netlink_unregister_notifier(&ipq_nl_notifier);
-}
-
-MODULE_DESCRIPTION("IPv6 packet queue handler");
-MODULE_LICENSE("GPL");
-
-module_init(ip6_queue_init);
-module_exit(ip6_queue_fini);
-
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