mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-19 09:59:04 +00:00
9bb7bc942d
When we have ip_queue being used from LOCAL_IN, then we end up with a situation where the verdicts coming back from userspace traverse the TCP input path from syscall context. While this seems to work most of the time, there's an ugly deadlock: syscall context is interrupted by the timer interrupt. When the timer interrupt leaves, the timer softirq get's scheduled and calls tcp_delack_timer() and alike. They themselves do bh_lock_sock(sk), which is already held from somewhere else -> boom. I've now tested the suggested solution by Patrick McHardy and Herbert Xu to simply use local_bh_{en,dis}able(). Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
749 lines
16 KiB
C
749 lines
16 KiB
C
/*
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* This is a module which is used for queueing IPv4 packets and
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* communicating with userspace via netlink.
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*
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* (C) 2000-2002 James Morris <jmorris@intercode.com.au>
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* (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* 2000-03-27: Simplified code (thanks to Andi Kleen for clues).
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* 2000-05-20: Fixed notifier problems (following Miguel Freitas' report).
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* 2000-06-19: Fixed so nfmark is copied to metadata (reported by Sebastian
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* Zander).
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* 2000-08-01: Added Nick Williams' MAC support.
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* 2002-06-25: Code cleanup.
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* 2005-01-10: Added /proc counter for dropped packets; fixed so
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* packets aren't delivered to user space if they're going
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* to be dropped.
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* 2005-05-26: local_bh_{disable,enable} around nf_reinject (Harald Welte)
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*
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/ip.h>
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#include <linux/notifier.h>
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#include <linux/netdevice.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4/ip_queue.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netlink.h>
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#include <linux/spinlock.h>
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#include <linux/sysctl.h>
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#include <linux/proc_fs.h>
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#include <linux/security.h>
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#include <net/sock.h>
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#include <net/route.h>
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#define IPQ_QMAX_DEFAULT 1024
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#define IPQ_PROC_FS_NAME "ip_queue"
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#define NET_IPQ_QMAX 2088
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#define NET_IPQ_QMAX_NAME "ip_queue_maxlen"
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struct ipq_rt_info {
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__u8 tos;
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__u32 daddr;
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__u32 saddr;
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};
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struct ipq_queue_entry {
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struct list_head list;
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struct nf_info *info;
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struct sk_buff *skb;
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struct ipq_rt_info rt_info;
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};
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typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long);
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static unsigned char copy_mode = IPQ_COPY_NONE;
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static unsigned int queue_maxlen = IPQ_QMAX_DEFAULT;
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static DEFINE_RWLOCK(queue_lock);
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static int peer_pid;
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static unsigned int copy_range;
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static unsigned int queue_total;
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static unsigned int queue_dropped = 0;
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static unsigned int queue_user_dropped = 0;
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static struct sock *ipqnl;
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static LIST_HEAD(queue_list);
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static DECLARE_MUTEX(ipqnl_sem);
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static void
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ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict)
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{
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/* TCP input path (and probably other bits) assume to be called
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* from softirq context, not from syscall, like ipq_issue_verdict is
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* called. TCP input path deadlocks with locks taken from timer
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* softirq, e.g. We therefore emulate this by local_bh_disable() */
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local_bh_disable();
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nf_reinject(entry->skb, entry->info, verdict);
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local_bh_enable();
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kfree(entry);
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}
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static inline void
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__ipq_enqueue_entry(struct ipq_queue_entry *entry)
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{
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list_add(&entry->list, &queue_list);
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queue_total++;
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}
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/*
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* Find and return a queued entry matched by cmpfn, or return the last
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* entry if cmpfn is NULL.
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*/
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static inline struct ipq_queue_entry *
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__ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data)
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{
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struct list_head *p;
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list_for_each_prev(p, &queue_list) {
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struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p;
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if (!cmpfn || cmpfn(entry, data))
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return entry;
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}
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return NULL;
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}
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static inline void
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__ipq_dequeue_entry(struct ipq_queue_entry *entry)
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{
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list_del(&entry->list);
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queue_total--;
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}
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static inline struct ipq_queue_entry *
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__ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
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{
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struct ipq_queue_entry *entry;
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entry = __ipq_find_entry(cmpfn, data);
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if (entry == NULL)
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return NULL;
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__ipq_dequeue_entry(entry);
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return entry;
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}
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static inline void
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__ipq_flush(int verdict)
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{
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struct ipq_queue_entry *entry;
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while ((entry = __ipq_find_dequeue_entry(NULL, 0)))
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ipq_issue_verdict(entry, verdict);
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}
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static inline int
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__ipq_set_mode(unsigned char mode, unsigned int range)
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{
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int status = 0;
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switch(mode) {
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case IPQ_COPY_NONE:
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case IPQ_COPY_META:
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copy_mode = mode;
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copy_range = 0;
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break;
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case IPQ_COPY_PACKET:
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copy_mode = mode;
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copy_range = range;
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if (copy_range > 0xFFFF)
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copy_range = 0xFFFF;
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break;
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default:
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status = -EINVAL;
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}
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return status;
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}
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static inline void
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__ipq_reset(void)
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{
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peer_pid = 0;
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net_disable_timestamp();
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__ipq_set_mode(IPQ_COPY_NONE, 0);
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__ipq_flush(NF_DROP);
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}
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static struct ipq_queue_entry *
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ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
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{
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struct ipq_queue_entry *entry;
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write_lock_bh(&queue_lock);
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entry = __ipq_find_dequeue_entry(cmpfn, data);
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write_unlock_bh(&queue_lock);
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return entry;
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}
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static void
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ipq_flush(int verdict)
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{
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write_lock_bh(&queue_lock);
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__ipq_flush(verdict);
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write_unlock_bh(&queue_lock);
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}
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static struct sk_buff *
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ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
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{
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unsigned char *old_tail;
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size_t size = 0;
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size_t data_len = 0;
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struct sk_buff *skb;
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struct ipq_packet_msg *pmsg;
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struct nlmsghdr *nlh;
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read_lock_bh(&queue_lock);
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switch (copy_mode) {
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case IPQ_COPY_META:
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case IPQ_COPY_NONE:
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size = NLMSG_SPACE(sizeof(*pmsg));
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data_len = 0;
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break;
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case IPQ_COPY_PACKET:
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if (copy_range == 0 || copy_range > entry->skb->len)
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data_len = entry->skb->len;
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else
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data_len = copy_range;
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size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
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break;
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default:
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*errp = -EINVAL;
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read_unlock_bh(&queue_lock);
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return NULL;
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}
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read_unlock_bh(&queue_lock);
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skb = alloc_skb(size, GFP_ATOMIC);
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if (!skb)
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goto nlmsg_failure;
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old_tail= skb->tail;
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nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
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pmsg = NLMSG_DATA(nlh);
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memset(pmsg, 0, sizeof(*pmsg));
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pmsg->packet_id = (unsigned long )entry;
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pmsg->data_len = data_len;
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pmsg->timestamp_sec = entry->skb->stamp.tv_sec;
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pmsg->timestamp_usec = entry->skb->stamp.tv_usec;
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pmsg->mark = entry->skb->nfmark;
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pmsg->hook = entry->info->hook;
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pmsg->hw_protocol = entry->skb->protocol;
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if (entry->info->indev)
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strcpy(pmsg->indev_name, entry->info->indev->name);
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else
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pmsg->indev_name[0] = '\0';
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if (entry->info->outdev)
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strcpy(pmsg->outdev_name, entry->info->outdev->name);
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else
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pmsg->outdev_name[0] = '\0';
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if (entry->info->indev && entry->skb->dev) {
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pmsg->hw_type = entry->skb->dev->type;
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if (entry->skb->dev->hard_header_parse)
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pmsg->hw_addrlen =
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entry->skb->dev->hard_header_parse(entry->skb,
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pmsg->hw_addr);
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}
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if (data_len)
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if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
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BUG();
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nlh->nlmsg_len = skb->tail - old_tail;
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return skb;
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nlmsg_failure:
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if (skb)
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kfree_skb(skb);
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*errp = -EINVAL;
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printk(KERN_ERR "ip_queue: error creating packet message\n");
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return NULL;
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}
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static int
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ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info, void *data)
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{
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int status = -EINVAL;
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struct sk_buff *nskb;
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struct ipq_queue_entry *entry;
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if (copy_mode == IPQ_COPY_NONE)
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return -EAGAIN;
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entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
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if (entry == NULL) {
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printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n");
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return -ENOMEM;
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}
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entry->info = info;
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entry->skb = skb;
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if (entry->info->hook == NF_IP_LOCAL_OUT) {
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struct iphdr *iph = skb->nh.iph;
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entry->rt_info.tos = iph->tos;
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entry->rt_info.daddr = iph->daddr;
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entry->rt_info.saddr = iph->saddr;
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}
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nskb = ipq_build_packet_message(entry, &status);
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if (nskb == NULL)
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goto err_out_free;
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write_lock_bh(&queue_lock);
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if (!peer_pid)
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goto err_out_free_nskb;
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if (queue_total >= queue_maxlen) {
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queue_dropped++;
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status = -ENOSPC;
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if (net_ratelimit())
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printk (KERN_WARNING "ip_queue: full at %d entries, "
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"dropping packets(s). Dropped: %d\n", queue_total,
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queue_dropped);
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goto err_out_free_nskb;
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}
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/* netlink_unicast will either free the nskb or attach it to a socket */
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status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
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if (status < 0) {
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queue_user_dropped++;
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goto err_out_unlock;
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}
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__ipq_enqueue_entry(entry);
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write_unlock_bh(&queue_lock);
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return status;
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err_out_free_nskb:
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kfree_skb(nskb);
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err_out_unlock:
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write_unlock_bh(&queue_lock);
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err_out_free:
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kfree(entry);
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return status;
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}
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static int
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ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
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{
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int diff;
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struct iphdr *user_iph = (struct iphdr *)v->payload;
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if (v->data_len < sizeof(*user_iph))
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return 0;
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diff = v->data_len - e->skb->len;
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if (diff < 0)
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skb_trim(e->skb, v->data_len);
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else if (diff > 0) {
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if (v->data_len > 0xFFFF)
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return -EINVAL;
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if (diff > skb_tailroom(e->skb)) {
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struct sk_buff *newskb;
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newskb = skb_copy_expand(e->skb,
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skb_headroom(e->skb),
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diff,
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GFP_ATOMIC);
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if (newskb == NULL) {
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printk(KERN_WARNING "ip_queue: OOM "
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"in mangle, dropping packet\n");
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return -ENOMEM;
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}
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if (e->skb->sk)
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skb_set_owner_w(newskb, e->skb->sk);
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kfree_skb(e->skb);
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e->skb = newskb;
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}
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skb_put(e->skb, diff);
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}
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if (!skb_ip_make_writable(&e->skb, v->data_len))
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return -ENOMEM;
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memcpy(e->skb->data, v->payload, v->data_len);
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e->skb->nfcache |= NFC_ALTERED;
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/*
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* Extra routing may needed on local out, as the QUEUE target never
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* returns control to the table.
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*/
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if (e->info->hook == NF_IP_LOCAL_OUT) {
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struct iphdr *iph = e->skb->nh.iph;
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if (!(iph->tos == e->rt_info.tos
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&& iph->daddr == e->rt_info.daddr
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&& iph->saddr == e->rt_info.saddr))
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return ip_route_me_harder(&e->skb);
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}
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return 0;
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}
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static inline int
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id_cmp(struct ipq_queue_entry *e, unsigned long id)
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{
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return (id == (unsigned long )e);
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}
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static int
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ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
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{
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struct ipq_queue_entry *entry;
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if (vmsg->value > NF_MAX_VERDICT)
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return -EINVAL;
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entry = ipq_find_dequeue_entry(id_cmp, vmsg->id);
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if (entry == NULL)
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return -ENOENT;
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else {
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int verdict = vmsg->value;
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if (vmsg->data_len && vmsg->data_len == len)
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if (ipq_mangle_ipv4(vmsg, entry) < 0)
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verdict = NF_DROP;
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ipq_issue_verdict(entry, verdict);
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return 0;
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}
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}
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|
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static int
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ipq_set_mode(unsigned char mode, unsigned int range)
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{
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int status;
|
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|
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write_lock_bh(&queue_lock);
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status = __ipq_set_mode(mode, range);
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write_unlock_bh(&queue_lock);
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return status;
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}
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|
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static int
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ipq_receive_peer(struct ipq_peer_msg *pmsg,
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unsigned char type, unsigned int len)
|
|
{
|
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int status = 0;
|
|
|
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if (len < sizeof(*pmsg))
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return -EINVAL;
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|
|
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switch (type) {
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case IPQM_MODE:
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status = ipq_set_mode(pmsg->msg.mode.value,
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pmsg->msg.mode.range);
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break;
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case IPQM_VERDICT:
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if (pmsg->msg.verdict.value > NF_MAX_VERDICT)
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status = -EINVAL;
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else
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status = ipq_set_verdict(&pmsg->msg.verdict,
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len - sizeof(*pmsg));
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break;
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default:
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status = -EINVAL;
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}
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return status;
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}
|
|
|
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static int
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dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex)
|
|
{
|
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if (entry->info->indev)
|
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if (entry->info->indev->ifindex == ifindex)
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return 1;
|
|
|
|
if (entry->info->outdev)
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if (entry->info->outdev->ifindex == ifindex)
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return 1;
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|
|
|
return 0;
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}
|
|
|
|
static void
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|
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);
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}
|
|
|
|
#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
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|
|
|
static inline void
|
|
ipq_rcv_skb(struct sk_buff *skb)
|
|
{
|
|
int status, type, pid, flags, nlmsglen, skblen;
|
|
struct nlmsghdr *nlh;
|
|
|
|
skblen = skb->len;
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if (skblen < sizeof(*nlh))
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return;
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|
|
nlh = (struct nlmsghdr *)skb->data;
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|
nlmsglen = nlh->nlmsg_len;
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if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
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return;
|
|
|
|
pid = nlh->nlmsg_pid;
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flags = nlh->nlmsg_flags;
|
|
|
|
if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
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|
RCV_SKB_FAIL(-EINVAL);
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|
|
|
if (flags & MSG_TRUNC)
|
|
RCV_SKB_FAIL(-ECOMM);
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|
|
|
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))
|
|
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,
|
|
skblen - 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;
|
|
|
|
down(&ipqnl_sem);
|
|
|
|
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);
|
|
}
|
|
|
|
up(&ipqnl_sem);
|
|
}
|
|
|
|
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 int
|
|
init_or_cleanup(int init)
|
|
{
|
|
int status = -ENOMEM;
|
|
struct proc_dir_entry *proc;
|
|
|
|
if (!init)
|
|
goto cleanup;
|
|
|
|
netlink_register_notifier(&ipq_nl_notifier);
|
|
ipqnl = netlink_kernel_create(NETLINK_FIREWALL, ipq_rcv_sk);
|
|
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, ipq_enqueue_packet, NULL);
|
|
if (status < 0) {
|
|
printk(KERN_ERR "ip_queue: failed to register queue handler\n");
|
|
goto cleanup_sysctl;
|
|
}
|
|
return status;
|
|
|
|
cleanup:
|
|
nf_unregister_queue_handler(PF_INET);
|
|
synchronize_net();
|
|
ipq_flush(NF_DROP);
|
|
|
|
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);
|
|
down(&ipqnl_sem);
|
|
up(&ipqnl_sem);
|
|
|
|
cleanup_netlink_notifier:
|
|
netlink_unregister_notifier(&ipq_nl_notifier);
|
|
return status;
|
|
}
|
|
|
|
static int __init init(void)
|
|
{
|
|
|
|
return init_or_cleanup(1);
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
init_or_cleanup(0);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("IPv4 packet queue handler");
|
|
MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init);
|
|
module_exit(fini);
|