> Compiling fails with the following output:
>
> ld: cannot open ipt_ah.o: No such file or directory
Thats a bug in the base 2.4.18pre7
> Maybe that was meant with
> > several 18pre7 netfilter bugs left unfixed for now
Yep
I've sent Marcelo fixes for all of this (which I attach below)
but I have not heard from him for at least 4 days now. Probably
he is at or on his way to some conference :-)
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/include/linux/netfilter_ipv4/ipt_ULOG.h linux/include/linux/netfilter_ipv4/ipt_ULOG.h
--- ../vanilla/2.4/linux/include/linux/netfilter_ipv4/ipt_ULOG.h Wed Dec 31 16:00:00 1969
+++ linux/include/linux/netfilter_ipv4/ipt_ULOG.h Wed Jan 23 05:04:35 2002
@@ -0,0 +1,46 @@
+/* Header file for IP tables userspace logging, Version 1.8
+ *
+ * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Distributed under the terms of GNU GPL */
+
+#ifndef _IPT_ULOG_H
+#define _IPT_ULOG_H
+
+#ifndef NETLINK_NFLOG
+#define NETLINK_NFLOG 5
+#endif
+
+#define ULOG_MAC_LEN 80
+#define ULOG_PREFIX_LEN 32
+
+#define ULOG_MAX_QLEN 50
+/* Why 50? Well... there is a limit imposed by the slab cache 131000
+ * bytes. So the multipart netlink-message has to be < 131000 bytes.
+ * Assuming a standard ethernet-mtu of 1500, we could define this up
+ * to 80... but even 50 seems to be big enough. */
+
+/* private data structure for each rule with a ULOG target */
+struct ipt_ulog_info {
+ unsigned int nl_group;
+ size_t copy_range;
+ size_t qthreshold;
+ char prefix[ULOG_PREFIX_LEN];
+};
+
+/* Format of the ULOG packets passed through netlink */
+typedef struct ulog_packet_msg {
+ unsigned long mark;
+ long timestamp_sec;
+ long timestamp_usec;
+ unsigned int hook;
+ char indev_name[IFNAMSIZ];
+ char outdev_name[IFNAMSIZ];
+ size_t data_len;
+ char prefix[ULOG_PREFIX_LEN];
+ unsigned char mac_len;
+ unsigned char mac[ULOG_MAC_LEN];
+ unsigned char payload[0];
+} ulog_packet_msg_t;
+
+#endif /*_IPT_ULOG_H*/
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/include/linux/netfilter_ipv4/ipt_ah.h linux/include/linux/netfilter_ipv4/ipt_ah.h
--- ../vanilla/2.4/linux/include/linux/netfilter_ipv4/ipt_ah.h Wed Dec 31 16:00:00 1969
+++ linux/include/linux/netfilter_ipv4/ipt_ah.h Wed Jan 23 05:04:38 2002
@@ -0,0 +1,16 @@
+#ifndef _IPT_AH_H
+#define _IPT_AH_H
+
+struct ipt_ah
+{
+ u_int32_t spis[2]; /* Security Parameter Index */
+ u_int8_t invflags; /* Inverse flags */
+};
+
+
+
+/* Values for "invflags" field in struct ipt_ah. */
+#define IPT_AH_INV_SPI 0x01 /* Invert the sense of spi. */
+#define IPT_AH_INV_MASK 0x01 /* All possible flags. */
+
+#endif /*_IPT_AH_H*/
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/include/linux/netfilter_ipv4/ipt_esp.h linux/include/linux/netfilter_ipv4/ipt_esp.h
--- ../vanilla/2.4/linux/include/linux/netfilter_ipv4/ipt_esp.h Wed Dec 31 16:00:00 1969
+++ linux/include/linux/netfilter_ipv4/ipt_esp.h Wed Jan 23 05:04:38 2002
@@ -0,0 +1,16 @@
+#ifndef _IPT_ESP_H
+#define _IPT_ESP_H
+
+struct ipt_esp
+{
+ u_int32_t spis[2]; /* Security Parameter Index */
+ u_int8_t invflags; /* Inverse flags */
+};
+
+
+
+/* Values for "invflags" field in struct ipt_esp. */
+#define IPT_ESP_INV_SPI 0x01 /* Invert the sense of spi. */
+#define IPT_ESP_INV_MASK 0x01 /* All possible flags. */
+
+#endif /*_IPT_ESP_H*/
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/include/linux/netfilter_ipv4.h linux/include/linux/netfilter_ipv4.h
--- ../vanilla/2.4/linux/include/linux/netfilter_ipv4.h Thu Nov 22 11:48:57 2001
+++ linux/include/linux/netfilter_ipv4.h Wed Jan 23 16:31:58 2002
@@ -73,4 +73,81 @@
/* 2.4 firewalling went 64 through 67. */
#define SO_ORIGINAL_DST 80
+
+/* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue
+ *
+ * Ideally this would be ins some netfilter_utility module, but creating this
+ * module for just one function doesn't make sense. -HW */
+
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/route.h>
+#include <linux/ip.h>
+
+static inline int route_me_harder(struct sk_buff **pskb)
+{
+ struct iphdr *iph = (*pskb)->nh.iph;
+ struct rtable *rt;
+ struct rt_key key = { dst:iph->daddr,
+ src:iph->saddr,
+ oif:(*pskb)->sk ? (*pskb)->sk->bound_dev_if : 0,
+ tos:RT_TOS(iph->tos)|RTO_CONN,
+#ifdef CONFIG_IP_ROUTE_FWMARK
+ fwmark:(*pskb)->nfmark
+#endif
+ };
+ struct net_device *dev_src = NULL;
+ int err;
+
+ /* accomodate ip_route_output_slow(), which expects the key src to be
+ 0 or a local address; however some non-standard hacks like
+ ipt_REJECT.c:send_reset() can cause packets with foreign
+ saddr to be appear on the NF_IP_LOCAL_OUT hook -MB */
+ if(key.src && !(dev_src = ip_dev_find(key.src)))
+ key.src = 0;
+
+ if ((err=ip_route_output_key(&rt, &key)) != 0) {
+ printk("route_me_harder: ip_route_output_key(dst=%u.%u.%u.%u, src=%u.%u.%u.%u, oif=%d, tos=0x%x, fwmark=0x%lx) error %d\n",
+ NIPQUAD(iph->daddr), NIPQUAD(iph->saddr),
+ (*pskb)->sk ? (*pskb)->sk->bound_dev_if : 0,
+ RT_TOS(iph->tos)|RTO_CONN,
+#ifdef CONFIG_IP_ROUTE_FWMARK
+ (*pskb)->nfmark,
+#else
+ 0UL,
+#endif
+ err);
+ goto out;
+ }
+
+ /* Drop old route. */
+ dst_release((*pskb)->dst);
+
+ (*pskb)->dst = &rt->u.dst;
+
+ /* Change in oif may mean change in hh_len. */
+ if (skb_headroom(*pskb) < (*pskb)->dst->dev->hard_header_len) {
+ struct sk_buff *nskb;
+
+ nskb = skb_realloc_headroom(*pskb,
+ (*pskb)->dst->dev->hard_header_len);
+ if (!nskb) {
+ err = -ENOMEM;
+ goto out;
+ }
+ if ((*pskb)->sk)
+ skb_set_owner_w(nskb, (*pskb)->sk);
+ kfree_skb(*pskb);
+ *pskb = nskb;
+ }
+
+out:
+ if (dev_src)
+ dev_put(dev_src);
+
+ return err;
+}
+
#endif /*__LINUX_IP_NETFILTER_H*/
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/net/ipv4/netfilter/ip_nat_standalone.c linux/net/ipv4/netfilter/ip_nat_standalone.c
--- ../vanilla/2.4/linux/net/ipv4/netfilter/ip_nat_standalone.c Thu Jan 24 08:09:38 2002
+++ linux/net/ipv4/netfilter/ip_nat_standalone.c Wed Jan 23 11:34:58 2002
@@ -166,46 +166,6 @@
return ip_nat_fn(hooknum, pskb, in, out, okfn);
}
-static int route_me_harder(struct sk_buff **pskb)
-{
- struct iphdr *iph = (*pskb)->nh.iph;
- struct rtable *rt;
- struct rt_key key = { dst:iph->daddr,
- src:iph->saddr,
- oif:(*pskb)->sk ? (*pskb)->sk->bound_dev_if : 0,
- tos:RT_TOS(iph->tos)|RTO_CONN,
-#ifdef CONFIG_IP_ROUTE_FWMARK
- fwmark:(*pskb)->nfmark
-#endif
- };
-
- if (ip_route_output_key(&rt, &key) != 0) {
- printk("route_me_harder: No more route.\n");
- return -EINVAL;
- }
-
- /* Drop old route. */
- dst_release((*pskb)->dst);
-
- (*pskb)->dst = &rt->u.dst;
-
- /* Change in oif may mean change in hh_len. */
- if (skb_headroom(*pskb) < (*pskb)->dst->dev->hard_header_len) {
- struct sk_buff *nskb;
-
- nskb = skb_realloc_headroom(*pskb,
- (*pskb)->dst->dev
- ->hard_header_len);
- if (!nskb)
- return -ENOMEM;
- if ((*pskb)->sk)
- skb_set_owner_w(nskb, (*pskb)->sk);
- kfree_skb(*pskb);
- *pskb = nskb;
- }
- return 0;
-}
-
static unsigned int
ip_nat_local_fn(unsigned int hooknum,
struct sk_buff **pskb,
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/net/ipv4/netfilter/ip_queue.c linux/net/ipv4/netfilter/ip_queue.c
--- ../vanilla/2.4/linux/net/ipv4/netfilter/ip_queue.c Sun Sep 30 12:26:08 2001
+++ linux/net/ipv4/netfilter/ip_queue.c Wed Jan 23 11:34:58 2002
@@ -216,32 +216,6 @@
kfree(q);
}
-/* With a chainsaw... */
-static int route_me_harder(struct sk_buff *skb)
-{
- struct iphdr *iph = skb->nh.iph;
- struct rtable *rt;
-
- struct rt_key key = {
- dst:iph->daddr, src:iph->saddr,
- oif:skb->sk ? skb->sk->bound_dev_if : 0,
- tos:RT_TOS(iph->tos)|RTO_CONN,
-#ifdef CONFIG_IP_ROUTE_FWMARK
- fwmark:skb->nfmark
-#endif
- };
-
- if (ip_route_output_key(&rt, &key) != 0) {
- printk("route_me_harder: No more route.\n");
- return -EINVAL;
- }
-
- /* Drop old route. */
- dst_release(skb->dst);
- skb->dst = &rt->u.dst;
- return 0;
-}
-
static int ipq_mangle_ipv4(ipq_verdict_msg_t *v, ipq_queue_element_t *e)
{
int diff;
@@ -287,7 +261,7 @@
if (!(iph->tos == e->rt_info.tos
&& iph->daddr == e->rt_info.daddr
&& iph->saddr == e->rt_info.saddr))
- return route_me_harder(e->skb);
+ return route_me_harder(&e->skb);
}
return 0;
}
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/net/ipv4/netfilter/ipfwadm_core.c linux/net/ipv4/netfilter/ipfwadm_core.c
--- ../vanilla/2.4/linux/net/ipv4/netfilter/ipfwadm_core.c Thu Jan 24 08:09:39 2002
+++ linux/net/ipv4/netfilter/ipfwadm_core.c Thu Jan 24 07:50:42 2002
@@ -20,7 +20,7 @@
* license in recognition of the original copyright.
* -- Alan Cox.
*
- * $Id: ipfwadm_core.c,v 1.9.2.1 2002/01/23 13:18:19 davem Exp $
+ * $Id: ipfwadm_core.c,v 1.9.2.2 2002/01/24 15:50:42 davem Exp $
*
* Ported from BSD to Linux,
* Alan Cox 22/Nov/1994.
@@ -688,7 +688,7 @@
ftmp = *chainptr;
*chainptr = ftmp->fw_next;
kfree(ftmp);
- MOD_DEC_USE_COUNT();
+ MOD_DEC_USE_COUNT;
}
restore_flags(flags);
}
@@ -732,7 +732,7 @@
ftmp->fw_next = *chainptr;
*chainptr=ftmp;
restore_flags(flags);
- MOD_INC_USE_COUNT();
+ MOD_INC_USE_COUNT;
return(0);
}
@@ -783,7 +783,7 @@
else
*chainptr=ftmp;
restore_flags(flags);
- MOD_INC_USE_COUNT();
+ MOD_INC_USE_COUNT;
return(0);
}
@@ -858,7 +858,7 @@
}
restore_flags(flags);
if (was_found) {
- MOD_DEC_USE_COUNT();
+ MOD_DEC_USE_COUNT;
return 0;
} else
return(EINVAL);
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/net/ipv4/netfilter/ipt_ULOG.c linux/net/ipv4/netfilter/ipt_ULOG.c
--- ../vanilla/2.4/linux/net/ipv4/netfilter/ipt_ULOG.c Wed Dec 31 16:00:00 1969
+++ linux/net/ipv4/netfilter/ipt_ULOG.c Wed Jan 23 05:04:35 2002
@@ -0,0 +1,349 @@
+/*
+ * netfilter module for userspace packet logging daemons
+ *
+ * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
+ *
+ * 2000/09/22 ulog-cprange feature added
+ * 2001/01/04 in-kernel queue as proposed by Sebastian Zander
+ * <zander@fokus.gmd.de>
+ * 2001/01/30 per-rule nlgroup conflicts with global queue.
+ * nlgroup now global (sysctl)
+ * 2001/04/19 ulog-queue reworked, now fixed buffer size specified at
+ * module loadtime -HW
+ *
+ * Released under the terms of the GPL
+ *
+ * This module accepts two parameters:
+ *
+ * nlbufsiz:
+ * The parameter specifies how big the buffer for each netlink multicast
+ * group is. e.g. If you say nlbufsiz=8192, up to eight kb of packets will
+ * get accumulated in the kernel until they are sent to userspace. It is
+ * NOT possible to allocate more than 128kB, and it is strongly discouraged,
+ * because atomically allocating 128kB inside the network rx softirq is not
+ * reliable. Please also keep in mind that this buffer size is allocated for
+ * each nlgroup you are using, so the total kernel memory usage increases
+ * by that factor.
+ *
+ * flushtimeout:
+ * Specify, after how many clock ticks (intel: 100 per second) the queue
+ * should be flushed even if it is not full yet.
+ *
+ * ipt_ULOG.c,v 1.15 2002/01/18 21:33:19 laforge Exp
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/config.h>
+#include <linux/spinlock.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/netlink.h>
+#include <linux/netdevice.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ULOG.h>
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <net/sock.h>
+
+MODULE_LICENSE("GPL");
+
+#define ULOG_NL_EVENT 111 /* Harald's favorite number */
+#define ULOG_MAXNLGROUPS 32 /* numer of nlgroups */
+
+#if 0
+#define DEBUGP(format, args...) printk(__FILE__ ":" __FUNCTION__ ":" \
+ format, ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define PRINTR(format, args...) do { if (net_ratelimit()) printk(format, ## args); } while (0);
+
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("IP tables userspace logging module");
+
+
+static unsigned int nlbufsiz = 4096;
+MODULE_PARM(nlbufsiz, "i");
+MODULE_PARM_DESC(nlbufsiz, "netlink buffer size");
+
+static unsigned int flushtimeout = 10 * HZ;
+MODULE_PARM(flushtimeout, "i");
+MODULE_PARM_DESC(flushtimeout, "buffer flush timeout");
+
+/* global data structures */
+
+typedef struct {
+ unsigned int qlen; /* number of nlmsgs' in the skb */
+ struct nlmsghdr *lastnlh; /* netlink header of last msg in skb */
+ struct sk_buff *skb; /* the pre-allocated skb */
+ struct timer_list timer; /* the timer function */
+} ulog_buff_t;
+
+static ulog_buff_t ulog_buffers[ULOG_MAXNLGROUPS]; /* array of buffers */
+
+static struct sock *nflognl; /* our socket */
+static size_t qlen; /* current length of multipart-nlmsg */
+DECLARE_LOCK(ulog_lock); /* spinlock */
+
+/* send one ulog_buff_t to userspace */
+static void ulog_send(unsigned int nlgroup)
+{
+ ulog_buff_t *ub = &ulog_buffers[nlgroup];
+
+ if (timer_pending(&ub->timer)) {
+ DEBUGP("ipt_ULOG: ulog_send: timer was pending, deleting\n");
+ del_timer(&ub->timer);
+ }
+
+ /* last nlmsg needs NLMSG_DONE */
+ if (ub->qlen > 1)
+ ub->lastnlh->nlmsg_type = NLMSG_DONE;
+
+ NETLINK_CB(ub->skb).dst_groups = nlgroup;
+ DEBUGP("ipt_ULOG: throwing %d packets to netlink mask %u\n",
+ ub->qlen, nlgroup);
+ netlink_broadcast(nflognl, ub->skb, 0, nlgroup, GFP_ATOMIC);
+
+ ub->qlen = 0;
+ ub->skb = NULL;
+ ub->lastnlh = NULL;
+
+}
+
+
+/* timer function to flush queue in ULOG_FLUSH_INTERVAL time */
+static void ulog_timer(unsigned long data)
+{
+ DEBUGP("ipt_ULOG: timer function called, calling ulog_send\n");
+
+ /* lock to protect against somebody modifying our structure
+ * from ipt_ulog_target at the same time */
+ LOCK_BH(&ulog_lock);
+ ulog_send(data);
+ UNLOCK_BH(&ulog_lock);
+}
+
+static void nflog_rcv(struct sock *sk, int len)
+{
+ printk("ipt_ULOG:nflog_rcv() did receive netlink message ?!?\n");
+}
+
+struct sk_buff *ulog_alloc_skb(unsigned int size)
+{
+ struct sk_buff *skb;
+
+ /* alloc skb which should be big enough for a whole
+ * multipart message. WARNING: has to be <= 131000
+ * due to slab allocator restrictions */
+
+ skb = alloc_skb(nlbufsiz, GFP_ATOMIC);
+ if (!skb) {
+ PRINTR("ipt_ULOG: can't alloc whole buffer %ub!\n",
+ nlbufsiz);
+
+ /* try to allocate only as much as we need for
+ * current packet */
+
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (!skb)
+ PRINTR("ipt_ULOG: can't even allocate %ub\n", size);
+ }
+
+ return skb;
+}
+
+static unsigned int ipt_ulog_target(struct sk_buff **pskb,
+ unsigned int hooknum,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *targinfo, void *userinfo)
+{
+ ulog_buff_t *ub;
+ ulog_packet_msg_t *pm;
+ size_t size, copy_len;
+ struct nlmsghdr *nlh;
+ struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) targinfo;
+
+ /* calculate the size of the skb needed */
+ if ((loginfo->copy_range == 0) ||
+ (loginfo->copy_range > (*pskb)->len)) {
+ copy_len = (*pskb)->len;
+ } else {
+ copy_len = loginfo->copy_range;
+ }
+
+ size = NLMSG_SPACE(sizeof(*pm) + copy_len);
+
+ ub = &ulog_buffers[loginfo->nl_group];
+
+ LOCK_BH(&ulog_lock);
+
+ if (!ub->skb) {
+ if (!(ub->skb = ulog_alloc_skb(size)))
+ goto alloc_failure;
+ } else if (ub->qlen >= loginfo->qthreshold ||
+ size > skb_tailroom(ub->skb)) {
+ /* either the queue len is too high or we don't have
+ * enough room in nlskb left. send it to userspace. */
+
+ ulog_send(loginfo->nl_group);
+
+ if (!(ub->skb = ulog_alloc_skb(size)))
+ goto alloc_failure;
+ }
+
+ DEBUGP("ipt_ULOG: qlen %d, qthreshold %d\n", ub->qlen,
+ loginfo->qthreshold);
+
+ /* NLMSG_PUT contains a hidden goto nlmsg_failure !!! */
+ nlh = NLMSG_PUT(ub->skb, 0, ub->qlen, ULOG_NL_EVENT,
+ size - sizeof(*nlh));
+ ub->qlen++;
+
+ pm = NLMSG_DATA(nlh);
+
+ /* copy hook, prefix, timestamp, payload, etc. */
+ pm->data_len = copy_len;
+ pm->timestamp_sec = (*pskb)->stamp.tv_sec;
+ pm->timestamp_usec = (*pskb)->stamp.tv_usec;
+ pm->mark = (*pskb)->nfmark;
+ pm->hook = hooknum;
+ if (loginfo->prefix[0] != '\0')
+ strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix));
+ else
+ *(pm->prefix) = '\0';
+
+ if (in && in->hard_header_len > 0
+ && (*pskb)->mac.raw != (void *) (*pskb)->nh.iph
+ && in->hard_header_len <= ULOG_MAC_LEN) {
+ memcpy(pm->mac, (*pskb)->mac.raw, in->hard_header_len);
+ pm->mac_len = in->hard_header_len;
+ }
+
+ if (in)
+ strncpy(pm->indev_name, in->name, sizeof(pm->indev_name));
+ else
+ pm->indev_name[0] = '\0';
+
+ if (out)
+ strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name));
+ else
+ pm->outdev_name[0] = '\0';
+
+ if (copy_len)
+ memcpy(pm->payload, (*pskb)->data, copy_len);
+
+ /* check if we are building multi-part messages */
+ if (ub->qlen > 1) {
+ ub->lastnlh->nlmsg_flags |= NLM_F_MULTI;
+ }
+
+ /* if threshold is reached, send message to userspace */
+ if (qlen >= loginfo->qthreshold) {
+ if (loginfo->qthreshold > 1)
+ nlh->nlmsg_type = NLMSG_DONE;
+ }
+
+ ub->lastnlh = nlh;
+
+ /* if timer isn't already running, start it */
+ if (!timer_pending(&ub->timer)) {
+ ub->timer.expires = jiffies + flushtimeout;
+ add_timer(&ub->timer);
+ }
+
+ UNLOCK_BH(&ulog_lock);
+
+ return IPT_CONTINUE;
+
+
+nlmsg_failure:
+ PRINTR("ipt_ULOG: error during NLMSG_PUT\n");
+
+alloc_failure:
+ PRINTR("ipt_ULOG: Error building netlink message\n");
+
+ UNLOCK_BH(&ulog_lock);
+
+ return IPT_CONTINUE;
+}
+
+static int ipt_ulog_checkentry(const char *tablename,
+ const struct ipt_entry *e,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hookmask)
+{
+ struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) targinfo;
+
+ if (targinfosize != IPT_ALIGN(sizeof(struct ipt_ulog_info))) {
+ DEBUGP("ipt_ULOG: targinfosize %u != 0\n", targinfosize);
+ return 0;
+ }
+
+ if (loginfo->prefix[sizeof(loginfo->prefix) - 1] != '\0') {
+ DEBUGP("ipt_ULOG: prefix term %i\n",
+ loginfo->prefix[sizeof(loginfo->prefix) - 1]);
+ return 0;
+ }
+
+ if (loginfo->qthreshold > ULOG_MAX_QLEN) {
+ DEBUGP("ipt_ULOG: queue threshold %i > MAX_QLEN\n",
+ loginfo->qthreshold);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ipt_target ipt_ulog_reg =
+ { {NULL, NULL}, "ULOG", ipt_ulog_target, ipt_ulog_checkentry, NULL,
+THIS_MODULE
+};
+
+static int __init init(void)
+{
+ int i;
+
+ DEBUGP("ipt_ULOG: init module\n");
+
+ if (nlbufsiz >= 128*1024) {
+ printk("Netlink buffer has to be <= 128kB\n");
+ return -EINVAL;
+ }
+
+ /* initialize ulog_buffers */
+ for (i = 0; i < ULOG_MAXNLGROUPS; i++) {
+ memset(&ulog_buffers[i], 0, sizeof(ulog_buff_t));
+ init_timer(&ulog_buffers[i].timer);
+ ulog_buffers[i].timer.function = ulog_timer;
+ ulog_buffers[i].timer.data = i;
+ }
+
+ nflognl = netlink_kernel_create(NETLINK_NFLOG, nflog_rcv);
+ if (!nflognl)
+ return -ENOMEM;
+
+ if (ipt_register_target(&ipt_ulog_reg) != 0) {
+ sock_release(nflognl->socket);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void __exit fini(void)
+{
+ DEBUGP("ipt_ULOG: cleanup_module\n");
+
+ ipt_unregister_target(&ipt_ulog_reg);
+ sock_release(nflognl->socket);
+}
+
+module_init(init);
+module_exit(fini);
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/net/ipv4/netfilter/ipt_ah.c linux/net/ipv4/netfilter/ipt_ah.c
--- ../vanilla/2.4/linux/net/ipv4/netfilter/ipt_ah.c Wed Dec 31 16:00:00 1969
+++ linux/net/ipv4/netfilter/ipt_ah.c Wed Jan 23 05:04:39 2002
@@ -0,0 +1,105 @@
+/* Kernel module to match AH parameters. */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ipt_ah.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
+
+#ifdef DEBUG_CONNTRACK
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+struct ahhdr {
+ __u32 spi;
+};
+
+/* Returns 1 if the spi is matched by the range, 0 otherwise */
+static inline int
+spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
+{
+ int r=0;
+ duprintf("ah spi_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
+ min,spi,max);
+ r=(spi >= min && spi <= max) ^ invert;
+ duprintf(" result %s\n",r? "PASS" : "FAILED");
+ return r;
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ const void *hdr,
+ u_int16_t datalen,
+ int *hotdrop)
+{
+ const struct ahhdr *ah = hdr;
+ const struct ipt_ah *ahinfo = matchinfo;
+
+ if (offset == 0 && datalen < sizeof(struct ahhdr)) {
+ /* We've been asked to examine this packet, and we
+ can't. Hence, no choice but to drop. */
+ duprintf("Dropping evil AH tinygram.\n");
+ *hotdrop = 1;
+ return 0;
+ }
+
+ /* Must not be a fragment. */
+ return !offset
+ && spi_match(ahinfo->spis[0], ahinfo->spis[1],
+ ntohl(ah->spi),
+ !!(ahinfo->invflags & IPT_AH_INV_SPI));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+checkentry(const char *tablename,
+ const struct ipt_ip *ip,
+ void *matchinfo,
+ unsigned int matchinfosize,
+ unsigned int hook_mask)
+{
+ const struct ipt_ah *ahinfo = matchinfo;
+
+ /* Must specify proto == AH, and no unknown invflags */
+ if (ip->proto != IPPROTO_AH || (ip->invflags & IPT_INV_PROTO)) {
+ duprintf("ipt_ah: Protocol %u != %u\n", ip->proto,
+ IPPROTO_AH);
+ return 0;
+ }
+ if (matchinfosize != IPT_ALIGN(sizeof(struct ipt_ah))) {
+ duprintf("ipt_ah: matchsize %u != %u\n",
+ matchinfosize, IPT_ALIGN(sizeof(struct ipt_ah)));
+ return 0;
+ }
+ if (ahinfo->invflags & ~IPT_AH_INV_MASK) {
+ duprintf("ipt_ah: unknown flags %X\n",
+ ahinfo->invflags);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ipt_match ah_match
+= { { NULL, NULL }, "ah", &match, &checkentry, NULL, THIS_MODULE };
+
+int __init init(void)
+{
+ return ipt_register_match(&ah_match);
+}
+
+void __exit cleanup(void)
+{
+ ipt_unregister_match(&ah_match);
+}
+
+module_init(init);
+module_exit(cleanup);
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/net/ipv4/netfilter/ipt_esp.c linux/net/ipv4/netfilter/ipt_esp.c
--- ../vanilla/2.4/linux/net/ipv4/netfilter/ipt_esp.c Wed Dec 31 16:00:00 1969
+++ linux/net/ipv4/netfilter/ipt_esp.c Wed Jan 23 05:04:39 2002
@@ -0,0 +1,105 @@
+/* Kernel module to match ESP parameters. */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ipt_esp.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
+
+#ifdef DEBUG_CONNTRACK
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+struct esphdr {
+ __u32 spi;
+};
+
+/* Returns 1 if the spi is matched by the range, 0 otherwise */
+static inline int
+spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
+{
+ int r=0;
+ duprintf("esp spi_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
+ min,spi,max);
+ r=(spi >= min && spi <= max) ^ invert;
+ duprintf(" result %s\n",r? "PASS" : "FAILED");
+ return r;
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ const void *hdr,
+ u_int16_t datalen,
+ int *hotdrop)
+{
+ const struct esphdr *esp = hdr;
+ const struct ipt_esp *espinfo = matchinfo;
+
+ if (offset == 0 && datalen < sizeof(struct esphdr)) {
+ /* We've been asked to examine this packet, and we
+ can't. Hence, no choice but to drop. */
+ duprintf("Dropping evil ESP tinygram.\n");
+ *hotdrop = 1;
+ return 0;
+ }
+
+ /* Must not be a fragment. */
+ return !offset
+ && spi_match(espinfo->spis[0], espinfo->spis[1],
+ ntohl(esp->spi),
+ !!(espinfo->invflags & IPT_ESP_INV_SPI));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+checkentry(const char *tablename,
+ const struct ipt_ip *ip,
+ void *matchinfo,
+ unsigned int matchinfosize,
+ unsigned int hook_mask)
+{
+ const struct ipt_esp *espinfo = matchinfo;
+
+ /* Must specify proto == ESP, and no unknown invflags */
+ if (ip->proto != IPPROTO_ESP || (ip->invflags & IPT_INV_PROTO)) {
+ duprintf("ipt_esp: Protocol %u != %u\n", ip->proto,
+ IPPROTO_ESP);
+ return 0;
+ }
+ if (matchinfosize != IPT_ALIGN(sizeof(struct ipt_esp))) {
+ duprintf("ipt_esp: matchsize %u != %u\n",
+ matchinfosize, IPT_ALIGN(sizeof(struct ipt_esp)));
+ return 0;
+ }
+ if (espinfo->invflags & ~IPT_ESP_INV_MASK) {
+ duprintf("ipt_esp: unknown flags %X\n",
+ espinfo->invflags);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ipt_match esp_match
+= { { NULL, NULL }, "esp", &match, &checkentry, NULL, THIS_MODULE };
+
+static int __init init(void)
+{
+ return ipt_register_match(&esp_match);
+}
+
+static void __exit cleanup(void)
+{
+ ipt_unregister_match(&esp_match);
+}
+
+module_init(init);
+module_exit(cleanup);
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/net/ipv4/netfilter/iptable_mangle.c linux/net/ipv4/netfilter/iptable_mangle.c
--- ../vanilla/2.4/linux/net/ipv4/netfilter/iptable_mangle.c Thu Jan 24 08:09:39 2002
+++ linux/net/ipv4/netfilter/iptable_mangle.c Wed Jan 23 11:34:59 2002
@@ -129,34 +129,6 @@
return ipt_do_table(pskb, hook, in, out, &packet_mangler, NULL);
}
-/* FIXME: change in oif may mean change in hh_len. Check and realloc
- --RR */
-static int
-route_me_harder(struct sk_buff *skb)
-{
- struct iphdr *iph = skb->nh.iph;
- struct rtable *rt;
- struct rt_key key = { dst:iph->daddr,
- src:iph->saddr,
- oif:skb->sk ? skb->sk->bound_dev_if : 0,
- tos:RT_TOS(iph->tos)|RTO_CONN,
-#ifdef CONFIG_IP_ROUTE_FWMARK
- fwmark:skb->nfmark
-#endif
- };
-
- if (ip_route_output_key(&rt, &key) != 0) {
- printk("route_me_harder: No more route.\n");
- return -EINVAL;
- }
-
- /* Drop old route. */
- dst_release(skb->dst);
-
- skb->dst = &rt->u.dst;
- return 0;
-}
-
static unsigned int
ipt_local_hook(unsigned int hook,
struct sk_buff **pskb,
@@ -190,7 +162,7 @@
|| (*pskb)->nh.iph->daddr != daddr
|| (*pskb)->nfmark != nfmark
|| (*pskb)->nh.iph->tos != tos))
- return route_me_harder(*pskb) == 0 ? ret : NF_DROP;
+ return route_me_harder(pskb) == 0 ? ret : NF_DROP;
return ret;
}
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore ../vanilla/2.4/linux/net/ipv6/netfilter/ip6_queue.c linux/net/ipv6/netfilter/ip6_queue.c
--- ../vanilla/2.4/linux/net/ipv6/netfilter/ip6_queue.c Wed Dec 31 16:00:00 1969
+++ linux/net/ipv6/netfilter/ip6_queue.c Wed Jan 23 05:04:35 2002
@@ -0,0 +1,721 @@
+/*
+ * 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@it.uc3m.es
+ *
+ * 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).
+ *
+ */
+#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/rtnetlink.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <net/sock.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+
+/* We're still usign the following structs. No need to change them: */
+/* ipq_packet_msg */
+/* ipq_mode_msg */
+/* ipq_verdict_msg */
+/* ipq_peer_msg */
+#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"
+
+typedef struct ip6q_rt_info {
+ struct in6_addr daddr;
+ struct in6_addr saddr;
+} ip6q_rt_info_t;
+
+typedef struct ip6q_queue_element {
+ struct list_head list; /* Links element into queue */
+ int verdict; /* Current verdict */
+ struct nf_info *info; /* Extra info from netfilter */
+ struct sk_buff *skb; /* Packet inside */
+ ip6q_rt_info_t rt_info; /* May need post-mangle routing */
+} ip6q_queue_element_t;
+
+typedef int (*ip6q_send_cb_t)(ip6q_queue_element_t *e);
+
+typedef struct ip6q_peer {
+ pid_t pid; /* PID of userland peer */
+ unsigned char died; /* We think the peer died */
+ unsigned char copy_mode; /* Copy packet as well as metadata? */
+ size_t copy_range; /* Range past metadata to copy */
+ ip6q_send_cb_t send; /* Callback for sending data to peer */
+} ip6q_peer_t;
+
+typedef struct ip6q_queue {
+ int len; /* Current queue len */
+ int *maxlen; /* Maximum queue len, via sysctl */
+ unsigned char flushing; /* If queue is being flushed */
+ unsigned char terminate; /* If the queue is being terminated */
+ struct list_head list; /* Head of packet queue */
+ spinlock_t lock; /* Queue spinlock */
+ ip6q_peer_t peer; /* Userland peer */
+} ip6q_queue_t;
+
+/****************************************************************************
+ *
+ * Packet queue
+ *
+ ****************************************************************************/
+/* Dequeue a packet if matched by cmp, or the next available if cmp is NULL */
+static ip6q_queue_element_t *
+ip6q_dequeue(ip6q_queue_t *q,
+ int (*cmp)(ip6q_queue_element_t *, unsigned long),
+ unsigned long data)
+{
+ struct list_head *i;
+
+ spin_lock_bh(&q->lock);
+ for (i = q->list.prev; i != &q->list; i = i->prev) {
+ ip6q_queue_element_t *e = (ip6q_queue_element_t *)i;
+
+ if (!cmp || cmp(e, data)) {
+ list_del(&e->list);
+ q->len--;
+ spin_unlock_bh(&q->lock);
+ return e;
+ }
+ }
+ spin_unlock_bh(&q->lock);
+ return NULL;
+}
+
+/* Flush all packets */
+static void ip6q_flush(ip6q_queue_t *q)
+{
+ ip6q_queue_element_t *e;
+
+ spin_lock_bh(&q->lock);
+ q->flushing = 1;
+ spin_unlock_bh(&q->lock);
+ while ((e = ip6q_dequeue(q, NULL, 0))) {
+ e->verdict = NF_DROP;
+ nf_reinject(e->skb, e->info, e->verdict);
+ kfree(e);
+ }
+ spin_lock_bh(&q->lock);
+ q->flushing = 0;
+ spin_unlock_bh(&q->lock);
+}
+
+static ip6q_queue_t *ip6q_create_queue(nf_queue_outfn_t outfn,
+ ip6q_send_cb_t send_cb,
+ int *errp, int *sysctl_qmax)
+{
+ int status;
+ ip6q_queue_t *q;
+
+ *errp = 0;
+ q = kmalloc(sizeof(ip6q_queue_t), GFP_KERNEL);
+ if (q == NULL) {
+ *errp = -ENOMEM;
+ return NULL;
+ }
+ q->peer.pid = 0;
+ q->peer.died = 0;
+ q->peer.copy_mode = IPQ_COPY_NONE;
+ q->peer.copy_range = 0;
+ q->peer.send = send_cb;
+ q->len = 0;
+ q->maxlen = sysctl_qmax;
+ q->flushing = 0;
+ q->terminate = 0;
+ INIT_LIST_HEAD(&q->list);
+ spin_lock_init(&q->lock);
+ status = nf_register_queue_handler(PF_INET6, outfn, q);
+ if (status < 0) {
+ *errp = -EBUSY;
+ kfree(q);
+ return NULL;
+ }
+ return q;
+}
+
+static int ip6q_enqueue(ip6q_queue_t *q,
+ struct sk_buff *skb, struct nf_info *info)
+{
+ ip6q_queue_element_t *e;
+ int status;
+
+ e = kmalloc(sizeof(*e), GFP_ATOMIC);
+ if (e == NULL) {
+ printk(KERN_ERR "ip6_queue: OOM in enqueue\n");
+ return -ENOMEM;
+ }
+
+ e->verdict = NF_DROP;
+ e->info = info;
+ e->skb = skb;
+
+ if (e->info->hook == NF_IP_LOCAL_OUT) {
+ struct ipv6hdr *iph = skb->nh.ipv6h;
+
+ e->rt_info.daddr = iph->daddr;
+ e->rt_info.saddr = iph->saddr;
+ }
+
+ spin_lock_bh(&q->lock);
+ if (q->len >= *q->maxlen) {
+ spin_unlock_bh(&q->lock);
+ if (net_ratelimit())
+ printk(KERN_WARNING "ip6_queue: full at %d entries, "
+ "dropping packet(s).\n", q->len);
+ goto free_drop;
+ }
+ if (q->flushing || q->peer.copy_mode == IPQ_COPY_NONE
+ || q->peer.pid == 0 || q->peer.died || q->terminate) {
+ spin_unlock_bh(&q->lock);
+ goto free_drop;
+ }
+ status = q->peer.send(e);
+ if (status > 0) {
+ list_add(&e->list, &q->list);
+ q->len++;
+ spin_unlock_bh(&q->lock);
+ return status;
+ }
+ spin_unlock_bh(&q->lock);
+ if (status == -ECONNREFUSED) {
+ printk(KERN_INFO "ip6_queue: peer %d died, "
+ "resetting state and flushing queue\n", q->peer.pid);
+ q->peer.died = 1;
+ q->peer.pid = 0;
+ q->peer.copy_mode = IPQ_COPY_NONE;
+ q->peer.copy_range = 0;
+ ip6q_flush(q);
+ }
+free_drop:
+ kfree(e);
+ return -EBUSY;
+}
+
+static void ip6q_destroy_queue(ip6q_queue_t *q)
+{
+ nf_unregister_queue_handler(PF_INET6);
+ spin_lock_bh(&q->lock);
+ q->terminate = 1;
+ spin_unlock_bh(&q->lock);
+ ip6q_flush(q);
+ kfree(q);
+}
+
+/*
+ * Taken from net/ipv6/ip6_output.c
+ *
+ * We should use the one there, but is defined static
+ * so we put this just here and let the things as
+ * they are now.
+ *
+ * If that one is modified, this one should be modified too.
+ */
+static int route6_me_harder(struct sk_buff *skb)
+{
+ struct ipv6hdr *iph = skb->nh.ipv6h;
+ struct dst_entry *dst;
+ struct flowi fl;
+
+ fl.proto = iph->nexthdr;
+ fl.fl6_dst = &iph->daddr;
+ fl.fl6_src = &iph->saddr;
+ fl.oif = skb->sk ? skb->sk->bound_dev_if : 0;
+ fl.fl6_flowlabel = 0;
+ fl.uli_u.ports.dport = 0;
+ fl.uli_u.ports.sport = 0;
+
+ dst = ip6_route_output(skb->sk, &fl);
+
+ if (dst->error) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "route6_me_harder: No more route.\n");
+ return -EINVAL;
+ }
+
+ /* Drop old route. */
+ dst_release(skb->dst);
+
+ skb->dst = dst;
+ return 0;
+}
+static int ip6q_mangle_ipv6(ipq_verdict_msg_t *v, ip6q_queue_element_t *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)
+ skb_trim(e->skb, v->data_len);
+ 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);
+ }
+ memcpy(e->skb->data, v->payload, v->data_len);
+ e->skb->nfcache |= NFC_ALTERED;
+
+ /*
+ * Extra routing may needed on local out, as the QUEUE target never
+ * returns control to the table.
+ * Not a nice way to cmp, but works
+ */
+ if (e->info->hook == NF_IP_LOCAL_OUT) {
+ struct ipv6hdr *iph = e->skb->nh.ipv6h;
+ if (!( iph->daddr.in6_u.u6_addr32[0] == e->rt_info.daddr.in6_u.u6_addr32[0]
+ && iph->daddr.in6_u.u6_addr32[1] == e->rt_info.daddr.in6_u.u6_addr32[1]
+ && iph->daddr.in6_u.u6_addr32[2] == e->rt_info.daddr.in6_u.u6_addr32[2]
+ && iph->daddr.in6_u.u6_addr32[3] == e->rt_info.daddr.in6_u.u6_addr32[3]
+ && iph->saddr.in6_u.u6_addr32[0] == e->rt_info.saddr.in6_u.u6_addr32[0]
+ && iph->saddr.in6_u.u6_addr32[1] == e->rt_info.saddr.in6_u.u6_addr32[1]
+ && iph->saddr.in6_u.u6_addr32[2] == e->rt_info.saddr.in6_u.u6_addr32[2]
+ && iph->saddr.in6_u.u6_addr32[3] == e->rt_info.saddr.in6_u.u6_addr32[3]))
+ return route6_me_harder(e->skb);
+ }
+ return 0;
+}
+
+static inline int id_cmp(ip6q_queue_element_t *e, unsigned long id)
+{
+ return (id == (unsigned long )e);
+}
+
+static int ip6q_set_verdict(ip6q_queue_t *q,
+ ipq_verdict_msg_t *v, unsigned int len)
+{
+ ip6q_queue_element_t *e;
+
+ if (v->value > NF_MAX_VERDICT)
+ return -EINVAL;
+ e = ip6q_dequeue(q, id_cmp, v->id);
+ if (e == NULL)
+ return -ENOENT;
+ else {
+ e->verdict = v->value;
+ if (v->data_len && v->data_len == len)
+ if (ip6q_mangle_ipv6(v, e) < 0)
+ e->verdict = NF_DROP;
+ nf_reinject(e->skb, e->info, e->verdict);
+ kfree(e);
+ return 0;
+ }
+}
+
+static int ip6q_receive_peer(ip6q_queue_t* q, ipq_peer_msg_t *m,
+ unsigned char type, unsigned int len)
+{
+
+ int status = 0;
+ int busy;
+
+ spin_lock_bh(&q->lock);
+ busy = (q->terminate || q->flushing);
+ spin_unlock_bh(&q->lock);
+ if (busy)
+ return -EBUSY;
+ if (len < sizeof(ipq_peer_msg_t))
+ return -EINVAL;
+ switch (type) {
+ case IPQM_MODE:
+ switch (m->msg.mode.value) {
+ case IPQ_COPY_META:
+ q->peer.copy_mode = IPQ_COPY_META;
+ q->peer.copy_range = 0;
+ break;
+ case IPQ_COPY_PACKET:
+ q->peer.copy_mode = IPQ_COPY_PACKET;
+ q->peer.copy_range = m->msg.mode.range;
+ if (q->peer.copy_range > 0xFFFF)
+ q->peer.copy_range = 0xFFFF;
+ break;
+ default:
+ status = -EINVAL;
+ }
+ break;
+ case IPQM_VERDICT:
+ if (m->msg.verdict.value > NF_MAX_VERDICT)
+ status = -EINVAL;
+ else
+ status = ip6q_set_verdict(q,
+ &m->msg.verdict,
+ len - sizeof(*m));
+ break;
+ default:
+ status = -EINVAL;
+ }
+ return status;
+}
+
+static inline int dev_cmp(ip6q_queue_element_t *e, unsigned long ifindex)
+{
+ if (e->info->indev)
+ if (e->info->indev->ifindex == ifindex)
+ return 1;
+ if (e->info->outdev)
+ if (e->info->outdev->ifindex == ifindex)
+ return 1;
+ return 0;
+}
+
+/* Drop any queued packets associated with device ifindex */
+static void ip6q_dev_drop(ip6q_queue_t *q, int ifindex)
+{
+ ip6q_queue_element_t *e;
+
+ while ((e = ip6q_dequeue(q, dev_cmp, ifindex))) {
+ e->verdict = NF_DROP;
+ nf_reinject(e->skb, e->info, e->verdict);
+ kfree(e);
+ }
+}
+
+/****************************************************************************
+ *
+ * Netfilter interface
+ *
+ ****************************************************************************/
+
+/*
+ * Packets arrive here from netfilter for queuing to userspace.
+ * All of them must be fed back via nf_reinject() or Alexey will kill Rusty.
+ */
+static int netfilter6_receive(struct sk_buff *skb,
+ struct nf_info *info, void *data)
+{
+ return ip6q_enqueue((ip6q_queue_t *)data, skb, info);
+}
+
+/****************************************************************************
+ *
+ * Netlink interface.
+ *
+ ****************************************************************************/
+
+static struct sock *nfnl = NULL;
+/* This is not a static one, so we should not repeat its name */
+ip6q_queue_t *nlq6 = NULL;
+
+static struct sk_buff *netlink_build_message(ip6q_queue_element_t *e, int *errp)
+{
+ unsigned char *old_tail;
+ size_t size = 0;
+ size_t data_len = 0;
+ struct sk_buff *skb;
+ ipq_packet_msg_t *pm;
+ struct nlmsghdr *nlh;
+
+ switch (nlq6->peer.copy_mode) {
+ size_t copy_range;
+
+ case IPQ_COPY_META:
+ size = NLMSG_SPACE(sizeof(*pm));
+ data_len = 0;
+ break;
+ case IPQ_COPY_PACKET:
+ copy_range = nlq6->peer.copy_range;
+ if (copy_range == 0 || copy_range > e->skb->len)
+ data_len = e->skb->len;
+ else
+ data_len = copy_range;
+ size = NLMSG_SPACE(sizeof(*pm) + data_len);
+
+ break;
+ case IPQ_COPY_NONE:
+ default:
+ *errp = -EINVAL;
+ return NULL;
+ }
+ 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));
+ pm = NLMSG_DATA(nlh);
+ memset(pm, 0, sizeof(*pm));
+ pm->packet_id = (unsigned long )e;
+ pm->data_len = data_len;
+ pm->timestamp_sec = e->skb->stamp.tv_sec;
+ pm->timestamp_usec = e->skb->stamp.tv_usec;
+ pm->mark = e->skb->nfmark;
+ pm->hook = e->info->hook;
+ if (e->info->indev) strcpy(pm->indev_name, e->info->indev->name);
+ else pm->indev_name[0] = '\0';
+ if (e->info->outdev) strcpy(pm->outdev_name, e->info->outdev->name);
+ else pm->outdev_name[0] = '\0';
+ pm->hw_protocol = e->skb->protocol;
+ if (e->info->indev && e->skb->dev) {
+ pm->hw_type = e->skb->dev->type;
+ if (e->skb->dev->hard_header_parse)
+ pm->hw_addrlen =
+ e->skb->dev->hard_header_parse(e->skb,
+ pm->hw_addr);
+ }
+ if (data_len)
+ memcpy(pm->payload, e->skb->data, data_len);
+ nlh->nlmsg_len = skb->tail - old_tail;
+ NETLINK_CB(skb).dst_groups = 0;
+ return skb;
+nlmsg_failure:
+ if (skb)
+ kfree_skb(skb);
+ *errp = 0;
+ printk(KERN_ERR "ip6_queue: error creating netlink message\n");
+ return NULL;
+}
+
+static int netlink_send_peer(ip6q_queue_element_t *e)
+{
+ int status = 0;
+ struct sk_buff *skb;
+
+ skb = netlink_build_message(e, &status);
+ if (skb == NULL)
+ return status;
+ return netlink_unicast(nfnl, skb, nlq6->peer.pid, MSG_DONTWAIT);
+}
+
+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0);
+
+static __inline__ void netlink_receive_user_skb(struct sk_buff *skb)
+{
+ int status, type;
+ struct nlmsghdr *nlh;
+
+ if (skb->len < sizeof(struct nlmsghdr))
+ return;
+
+ nlh = (struct nlmsghdr *)skb->data;
+ if (nlh->nlmsg_len < sizeof(struct nlmsghdr)
+ || skb->len < nlh->nlmsg_len)
+ return;
+
+ if(nlh->nlmsg_pid <= 0
+ || !(nlh->nlmsg_flags & NLM_F_REQUEST)
+ || nlh->nlmsg_flags & NLM_F_MULTI)
+ RCV_SKB_FAIL(-EINVAL);
+ if (nlh->nlmsg_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(!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN))
+ RCV_SKB_FAIL(-EPERM);
+ if (nlq6->peer.pid && !nlq6->peer.died
+ && (nlq6->peer.pid != nlh->nlmsg_pid)) {
+ printk(KERN_WARNING "ip6_queue: peer pid changed from %d to "
+ "%d, flushing queue\n", nlq6->peer.pid, nlh->nlmsg_pid);
+ ip6q_flush(nlq6);
+ }
+ nlq6->peer.pid = nlh->nlmsg_pid;
+ nlq6->peer.died = 0;
+ status = ip6q_receive_peer(nlq6, NLMSG_DATA(nlh),
+ type, skb->len - NLMSG_LENGTH(0));
+ if (status < 0)
+ RCV_SKB_FAIL(status);
+ if (nlh->nlmsg_flags & NLM_F_ACK)
+ netlink_ack(skb, nlh, 0);
+ return;
+}
+
+/* Note: we are only dealing with single part messages at the moment. */
+static void netlink_receive_user_sk(struct sock *sk, int len)
+{
+ do {
+ struct sk_buff *skb;
+
+ if (rtnl_shlock_nowait())
+ return;
+ while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
+ netlink_receive_user_skb(skb);
+ kfree_skb(skb);
+ }
+ up(&rtnl_sem);
+ } while (nfnl && nfnl->receive_queue.qlen);
+}
+
+/****************************************************************************
+ *
+ * System events
+ *
+ ****************************************************************************/
+
+static int receive_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)
+ ip6q_dev_drop(nlq6, dev->ifindex);
+ return NOTIFY_DONE;
+}
+
+struct notifier_block ip6q_dev_notifier = {
+ receive_event,
+ NULL,
+ 0
+};
+
+/****************************************************************************
+ *
+ * Sysctl - queue tuning.
+ *
+ ****************************************************************************/
+
+static int sysctl_maxlen = IPQ_QMAX_DEFAULT;
+
+static struct ctl_table_header *ip6q_sysctl_header;
+
+static ctl_table ip6q_table[] = {
+ { NET_IPQ_QMAX, NET_IPQ_QMAX_NAME, &sysctl_maxlen,
+ sizeof(sysctl_maxlen), 0644, NULL, proc_dointvec },
+ { 0 }
+};
+
+static ctl_table ip6q_dir_table[] = {
+ {NET_IPV6, "ipv6", NULL, 0, 0555, ip6q_table, 0, 0, 0, 0, 0},
+ { 0 }
+};
+
+static ctl_table ip6q_root_table[] = {
+ {CTL_NET, "net", NULL, 0, 0555, ip6q_dir_table, 0, 0, 0, 0, 0},
+ { 0 }
+};
+
+/****************************************************************************
+ *
+ * Procfs - debugging info.
+ *
+ ****************************************************************************/
+
+static int ip6q_get_info(char *buffer, char **start, off_t offset, int length)
+{
+ int len;
+
+ spin_lock_bh(&nlq6->lock);
+ len = sprintf(buffer,
+ "Peer pid : %d\n"
+ "Peer died : %d\n"
+ "Peer copy mode : %d\n"
+ "Peer copy range : %Zu\n"
+ "Queue length : %d\n"
+ "Queue max. length : %d\n"
+ "Queue flushing : %d\n"
+ "Queue terminate : %d\n",
+ nlq6->peer.pid,
+ nlq6->peer.died,
+ nlq6->peer.copy_mode,
+ nlq6->peer.copy_range,
+ nlq6->len,
+ *nlq6->maxlen,
+ nlq6->flushing,
+ nlq6->terminate);
+ spin_unlock_bh(&nlq6->lock);
+ *start = buffer + offset;
+ len -= offset;
+ if (len > length)
+ len = length;
+ else if (len < 0)
+ len = 0;
+ return len;
+}
+
+/****************************************************************************
+ *
+ * Module stuff.
+ *
+ ****************************************************************************/
+
+static int __init init(void)
+{
+ int status = 0;
+ struct proc_dir_entry *proc;
+
+ /* We must create the NETLINK_IP6_FW protocol service */
+ nfnl = netlink_kernel_create(NETLINK_IP6_FW, netlink_receive_user_sk);
+ if (nfnl == NULL) {
+ printk(KERN_ERR "ip6_queue: initialisation failed: unable to "
+ "create kernel netlink socket\n");
+ return -ENOMEM;
+ }
+ nlq6 = ip6q_create_queue(netfilter6_receive,
+ netlink_send_peer, &status, &sysctl_maxlen);
+ if (nlq6 == NULL) {
+ printk(KERN_ERR "ip6_queue: initialisation failed: unable to "
+ "create queue\n");
+ sock_release(nfnl->socket);
+ return status;
+ }
+ /* The file will be /proc/net/ip6_queue */
+ proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ip6q_get_info);
+ if (proc) proc->owner = THIS_MODULE;
+ else {
+ ip6q_destroy_queue(nlq6);
+ sock_release(nfnl->socket);
+ return -ENOMEM;
+ }
+ register_netdevice_notifier(&ip6q_dev_notifier);
+ ip6q_sysctl_header = register_sysctl_table(ip6q_root_table, 0);
+ return status;
+}
+
+static void __exit fini(void)
+{
+ unregister_sysctl_table(ip6q_sysctl_header);
+ proc_net_remove(IPQ_PROC_FS_NAME);
+ unregister_netdevice_notifier(&ip6q_dev_notifier);
+ ip6q_destroy_queue(nlq6);
+ sock_release(nfnl->socket);
+}
+
+MODULE_DESCRIPTION("IPv6 packet queue handler");
+MODULE_LICENSE("GPL");
+
+module_init(init);
+module_exit(fini);
-
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