* 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/spinlock.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
#include <linux/mutex.h>
+#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
+#include <net/netfilter/nf_queue.h>
#include <linux/netfilter_ipv4/ip_queue.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#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);
+typedef int (*ipq_cmpfn)(struct nf_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 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)
+__ipq_enqueue_entry(struct nf_queue_entry *entry)
{
- list_add(&entry->list, &queue_list);
+ list_add_tail(&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)
{
return status;
}
+static void __ipq_flush(ipq_cmpfn cmpfn, unsigned long data);
+
static inline void
__ipq_reset(void)
{
peer_pid = 0;
net_disable_timestamp();
__ipq_set_mode(IPQ_COPY_NONE, 0);
- __ipq_flush(NF_DROP);
+ __ipq_flush(NULL, 0);
}
-static struct ipq_queue_entry *
-ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
+static struct nf_queue_entry *
+ipq_find_dequeue_entry(unsigned long id)
{
- struct ipq_queue_entry *entry;
+ struct nf_queue_entry *entry = NULL, *i;
write_lock_bh(&queue_lock);
- entry = __ipq_find_dequeue_entry(cmpfn, data);
+
+ list_for_each_entry(i, &queue_list, list) {
+ if ((unsigned long)i == id) {
+ entry = i;
+ break;
+ }
+ }
+
+ if (entry) {
+ list_del(&entry->list);
+ queue_total--;
+ }
+
write_unlock_bh(&queue_lock);
return entry;
}
static void
-ipq_flush(int verdict)
+__ipq_flush(ipq_cmpfn cmpfn, unsigned long data)
+{
+ struct nf_queue_entry *entry, *next;
+
+ list_for_each_entry_safe(entry, next, &queue_list, list) {
+ if (!cmpfn || cmpfn(entry, data)) {
+ list_del(&entry->list);
+ queue_total--;
+ nf_reinject(entry, NF_DROP);
+ }
+ }
+}
+
+static void
+ipq_flush(ipq_cmpfn cmpfn, unsigned long data)
{
write_lock_bh(&queue_lock);
- __ipq_flush(verdict);
+ __ipq_flush(cmpfn, data);
write_unlock_bh(&queue_lock);
}
static struct sk_buff *
-ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
+ipq_build_packet_message(struct nf_queue_entry *entry, int *errp)
{
sk_buff_data_t old_tail;
size_t size = 0;
pmsg->timestamp_sec = tv.tv_sec;
pmsg->timestamp_usec = tv.tv_usec;
pmsg->mark = entry->skb->mark;
- pmsg->hook = entry->info->hook;
+ pmsg->hook = entry->hook;
pmsg->hw_protocol = entry->skb->protocol;
- if (entry->info->indev)
- strcpy(pmsg->indev_name, entry->info->indev->name);
+ if (entry->indev)
+ strcpy(pmsg->indev_name, entry->indev->name);
else
pmsg->indev_name[0] = '\0';
- if (entry->info->outdev)
- strcpy(pmsg->outdev_name, entry->info->outdev->name);
+ if (entry->outdev)
+ strcpy(pmsg->outdev_name, entry->outdev->name);
else
pmsg->outdev_name[0] = '\0';
- if (entry->info->indev && entry->skb->dev) {
+ if (entry->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);
+ pmsg->hw_addrlen = dev_parse_header(entry->skb, pmsg->hw_addr);
}
if (data_len)
}
static int
-ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info,
- unsigned int queuenum, void *data)
+ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
{
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;
+ return status;
write_lock_bh(&queue_lock);
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)
+ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct nf_queue_entry *e)
{
int diff;
struct ipv6hdr *user_iph = (struct ipv6hdr *)v->payload;
+ struct sk_buff *nskb;
if (v->data_len < sizeof(*user_iph))
return 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) {
+ nskb = skb_copy_expand(e->skb, 0,
+ diff - skb_tailroom(e->skb),
+ GFP_ATOMIC);
+ if (!nskb) {
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;
+ e->skb = nskb;
}
skb_put(e->skb, diff);
}
- if (!skb_make_writable(&e->skb, v->data_len))
+ if (!skb_make_writable(e->skb, v->data_len))
return -ENOMEM;
- memcpy(e->skb->data, v->payload, v->data_len);
+ skb_copy_to_linear_data(e->skb, 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;
+ struct nf_queue_entry *entry;
if (vmsg->value > NF_MAX_VERDICT)
return -EINVAL;
- entry = ipq_find_dequeue_entry(id_cmp, vmsg->id);
+ entry = ipq_find_dequeue_entry(vmsg->id);
if (entry == NULL)
return -ENOENT;
else {
if (ipq_mangle_ipv6(vmsg, entry) < 0)
verdict = NF_DROP;
- ipq_issue_verdict(entry, verdict);
+ nf_reinject(entry, verdict);
return 0;
}
}
}
static int
-dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex)
+dev_cmp(struct nf_queue_entry *entry, unsigned long ifindex)
{
- if (entry->info->indev)
- if (entry->info->indev->ifindex == ifindex)
+ if (entry->indev)
+ if (entry->indev->ifindex == ifindex)
return 1;
- if (entry->info->outdev)
- if (entry->info->outdev->ifindex == ifindex)
+ if (entry->outdev)
+ if (entry->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);
+ ipq_flush(dev_cmp, ifindex);
}
#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
static inline void
-ipq_rcv_skb(struct sk_buff *skb)
+__ipq_rcv_skb(struct sk_buff *skb)
{
int status, type, pid, flags, nlmsglen, skblen;
struct nlmsghdr *nlh;
}
static void
-ipq_rcv_sk(struct sock *sk, int len)
+ipq_rcv_skb(struct sk_buff *skb)
{
- 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);
- }
-
+ __ipq_rcv_skb(skb);
mutex_unlock(&ipqnl_mutex);
}
{
struct net_device *dev = ptr;
+ if (dev->nd_net != &init_net)
+ return NOTIFY_DONE;
+
/* Drop any packets associated with the downed device */
if (event == NETDEV_DOWN)
ipq_dev_drop(dev->ifindex);
if (event == NETLINK_URELEASE &&
n->protocol == NETLINK_IP6_FW && n->pid) {
write_lock_bh(&queue_lock);
- if (n->pid == peer_pid)
+ if ((n->net == &init_net) && (n->pid == peer_pid))
__ipq_reset();
write_unlock_bh(&queue_lock);
}
.notifier_call = ipq_rcv_nl_event,
};
+#ifdef CONFIG_SYSCTL
static struct ctl_table_header *ipq_sysctl_header;
static ctl_table ipq_table[] = {
},
{ .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 }
-};
+#endif
#ifdef CONFIG_PROC_FS
-static int
-ipq_get_info(char *buffer, char **start, off_t offset, int length)
+static int ip6_queue_show(struct seq_file *m, void *v)
{
- int len;
-
read_lock_bh(&queue_lock);
- len = sprintf(buffer,
+ seq_printf(m,
"Peer PID : %d\n"
"Copy mode : %hu\n"
"Copy range : %u\n"
queue_user_dropped);
read_unlock_bh(&queue_lock);
+ return 0;
+}
- *start = buffer + offset;
- len -= offset;
- if (len > length)
- len = length;
- else if (len < 0)
- len = 0;
- return len;
+static int ip6_queue_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ip6_queue_show, NULL);
}
-#endif /* CONFIG_PROC_FS */
-static struct nf_queue_handler nfqh = {
+static const struct file_operations ip6_queue_proc_fops = {
+ .open = ip6_queue_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .owner = THIS_MODULE,
+};
+#endif
+
+static const 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;
+ struct proc_dir_entry *proc __maybe_unused;
netlink_register_notifier(&ipq_nl_notifier);
- ipqnl = netlink_kernel_create(NETLINK_IP6_FW, 0, ipq_rcv_sk,
- THIS_MODULE);
+ ipqnl = netlink_kernel_create(&init_net, NETLINK_IP6_FW, 0,
+ ipq_rcv_skb, NULL, 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 {
+#ifdef CONFIG_PROC_FS
+ proc = proc_create(IPQ_PROC_FS_NAME, 0, init_net.proc_net,
+ &ip6_queue_proc_fops);
+ if (!proc) {
printk(KERN_ERR "ip6_queue: failed to create proc entry\n");
goto cleanup_ipqnl;
}
-
+#endif
register_netdevice_notifier(&ipq_dev_notifier);
- ipq_sysctl_header = register_sysctl_table(ipq_root_table);
-
+#ifdef CONFIG_SYSCTL
+ ipq_sysctl_header = register_sysctl_paths(net_ipv6_ctl_path, ipq_table);
+#endif
status = nf_register_queue_handler(PF_INET6, &nfqh);
if (status < 0) {
printk(KERN_ERR "ip6_queue: failed to register queue handler\n");
return status;
cleanup_sysctl:
+#ifdef CONFIG_SYSCTL
unregister_sysctl_table(ipq_sysctl_header);
+#endif
unregister_netdevice_notifier(&ipq_dev_notifier);
- proc_net_remove(IPQ_PROC_FS_NAME);
+ proc_net_remove(&init_net, IPQ_PROC_FS_NAME);
-cleanup_ipqnl:
- sock_release(ipqnl->sk_socket);
+cleanup_ipqnl: __maybe_unused
+ netlink_kernel_release(ipqnl);
mutex_lock(&ipqnl_mutex);
mutex_unlock(&ipqnl_mutex);
{
nf_unregister_queue_handlers(&nfqh);
synchronize_net();
- ipq_flush(NF_DROP);
+ ipq_flush(NULL, 0);
+#ifdef CONFIG_SYSCTL
unregister_sysctl_table(ipq_sysctl_header);
+#endif
unregister_netdevice_notifier(&ipq_dev_notifier);
- proc_net_remove(IPQ_PROC_FS_NAME);
+ proc_net_remove(&init_net, IPQ_PROC_FS_NAME);
- sock_release(ipqnl->sk_socket);
+ netlink_kernel_release(ipqnl);
mutex_lock(&ipqnl_mutex);
mutex_unlock(&ipqnl_mutex);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff