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![Florian Westphal](/assets/img/avatar_default.png)
handle everything from ctnetlink directly. After all these years we still only support ipv4 and ipv6, so it seems reasonable to remove l3 protocol tracker support and instead handle ipv4/ipv6 from a common, always builtin inet tracker. Step 1: Get rid of all the l3proto->func() calls. Start with ctnetlink, then move on to packet-path ones. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
611 lines
14 KiB
C
611 lines
14 KiB
C
/* L3/L4 protocol support for nf_conntrack. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
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* (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
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* (C) 2006-2012 Patrick McHardy <kaber@trash.net>
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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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#include <linux/types.h>
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#include <linux/netfilter.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/vmalloc.h>
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#include <linux/stddef.h>
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#include <linux/err.h>
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_l3proto.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_log.h>
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static struct nf_conntrack_l4proto __rcu **nf_ct_protos[NFPROTO_NUMPROTO] __read_mostly;
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struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[NFPROTO_NUMPROTO] __read_mostly;
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EXPORT_SYMBOL_GPL(nf_ct_l3protos);
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static DEFINE_MUTEX(nf_ct_proto_mutex);
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#ifdef CONFIG_SYSCTL
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static int
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nf_ct_register_sysctl(struct net *net,
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struct ctl_table_header **header,
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const char *path,
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struct ctl_table *table)
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{
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if (*header == NULL) {
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*header = register_net_sysctl(net, path, table);
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if (*header == NULL)
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return -ENOMEM;
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}
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return 0;
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}
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static void
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nf_ct_unregister_sysctl(struct ctl_table_header **header,
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struct ctl_table **table,
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unsigned int users)
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{
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if (users > 0)
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return;
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unregister_net_sysctl_table(*header);
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kfree(*table);
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*header = NULL;
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*table = NULL;
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}
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__printf(5, 6)
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void nf_l4proto_log_invalid(const struct sk_buff *skb,
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struct net *net,
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u16 pf, u8 protonum,
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const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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if (net->ct.sysctl_log_invalid != protonum ||
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net->ct.sysctl_log_invalid != IPPROTO_RAW)
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return;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
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"nf_ct_proto_%d: %pV ", protonum, &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL_GPL(nf_l4proto_log_invalid);
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__printf(3, 4)
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void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
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const struct nf_conn *ct,
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const char *fmt, ...)
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{
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struct va_format vaf;
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struct net *net;
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va_list args;
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net = nf_ct_net(ct);
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if (likely(net->ct.sysctl_log_invalid == 0))
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return;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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nf_l4proto_log_invalid(skb, net, nf_ct_l3num(ct),
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nf_ct_protonum(ct), "%pV", &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_log_invalid);
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#endif
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const struct nf_conntrack_l4proto *
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__nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto)
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{
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if (unlikely(l3proto >= NFPROTO_NUMPROTO || nf_ct_protos[l3proto] == NULL))
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return &nf_conntrack_l4proto_generic;
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return rcu_dereference(nf_ct_protos[l3proto][l4proto]);
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}
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EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find);
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/* this is guaranteed to always return a valid protocol helper, since
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* it falls back to generic_protocol */
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const struct nf_conntrack_l3proto *
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nf_ct_l3proto_find_get(u_int16_t l3proto)
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{
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struct nf_conntrack_l3proto *p;
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rcu_read_lock();
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p = __nf_ct_l3proto_find(l3proto);
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if (!try_module_get(p->me))
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p = &nf_conntrack_l3proto_generic;
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rcu_read_unlock();
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return p;
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}
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get);
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int
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nf_ct_l3proto_try_module_get(unsigned short l3proto)
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{
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const struct nf_conntrack_l3proto *p;
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int ret;
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retry: p = nf_ct_l3proto_find_get(l3proto);
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if (p == &nf_conntrack_l3proto_generic) {
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ret = request_module("nf_conntrack-%d", l3proto);
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if (!ret)
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goto retry;
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return -EPROTOTYPE;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get);
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void nf_ct_l3proto_module_put(unsigned short l3proto)
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{
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struct nf_conntrack_l3proto *p;
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/* rcu_read_lock not necessary since the caller holds a reference, but
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* taken anyways to avoid lockdep warnings in __nf_ct_l3proto_find()
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*/
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rcu_read_lock();
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p = __nf_ct_l3proto_find(l3proto);
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module_put(p->me);
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rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put);
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static int nf_ct_netns_do_get(struct net *net, u8 nfproto)
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{
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const struct nf_conntrack_l3proto *l3proto;
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int ret;
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might_sleep();
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ret = nf_ct_l3proto_try_module_get(nfproto);
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if (ret < 0)
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return ret;
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/* we already have a reference, can't fail */
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rcu_read_lock();
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l3proto = __nf_ct_l3proto_find(nfproto);
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rcu_read_unlock();
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if (!l3proto->net_ns_get)
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return 0;
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ret = l3proto->net_ns_get(net);
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if (ret < 0)
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nf_ct_l3proto_module_put(nfproto);
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return ret;
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}
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int nf_ct_netns_get(struct net *net, u8 nfproto)
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{
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int err;
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if (nfproto == NFPROTO_INET) {
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err = nf_ct_netns_do_get(net, NFPROTO_IPV4);
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if (err < 0)
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goto err1;
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err = nf_ct_netns_do_get(net, NFPROTO_IPV6);
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if (err < 0)
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goto err2;
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} else {
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err = nf_ct_netns_do_get(net, nfproto);
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if (err < 0)
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goto err1;
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}
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return 0;
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err2:
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nf_ct_netns_put(net, NFPROTO_IPV4);
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err1:
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return err;
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}
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EXPORT_SYMBOL_GPL(nf_ct_netns_get);
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static void nf_ct_netns_do_put(struct net *net, u8 nfproto)
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{
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const struct nf_conntrack_l3proto *l3proto;
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might_sleep();
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/* same as nf_conntrack_netns_get(), reference assumed */
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rcu_read_lock();
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l3proto = __nf_ct_l3proto_find(nfproto);
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rcu_read_unlock();
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if (WARN_ON(!l3proto))
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return;
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if (l3proto->net_ns_put)
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l3proto->net_ns_put(net);
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nf_ct_l3proto_module_put(nfproto);
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}
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void nf_ct_netns_put(struct net *net, uint8_t nfproto)
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{
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if (nfproto == NFPROTO_INET) {
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nf_ct_netns_do_put(net, NFPROTO_IPV4);
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nf_ct_netns_do_put(net, NFPROTO_IPV6);
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} else
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nf_ct_netns_do_put(net, nfproto);
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}
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EXPORT_SYMBOL_GPL(nf_ct_netns_put);
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const struct nf_conntrack_l4proto *
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nf_ct_l4proto_find_get(u_int16_t l3num, u_int8_t l4num)
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{
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const struct nf_conntrack_l4proto *p;
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rcu_read_lock();
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p = __nf_ct_l4proto_find(l3num, l4num);
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if (!try_module_get(p->me))
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p = &nf_conntrack_l4proto_generic;
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rcu_read_unlock();
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return p;
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}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get);
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void nf_ct_l4proto_put(const struct nf_conntrack_l4proto *p)
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{
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module_put(p->me);
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}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_put);
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static int kill_l3proto(struct nf_conn *i, void *data)
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{
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return nf_ct_l3num(i) == ((const struct nf_conntrack_l3proto *)data)->l3proto;
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}
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static int kill_l4proto(struct nf_conn *i, void *data)
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{
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const struct nf_conntrack_l4proto *l4proto;
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l4proto = data;
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return nf_ct_protonum(i) == l4proto->l4proto &&
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nf_ct_l3num(i) == l4proto->l3proto;
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}
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int nf_ct_l3proto_register(const struct nf_conntrack_l3proto *proto)
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{
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int ret = 0;
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struct nf_conntrack_l3proto *old;
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if (proto->l3proto >= NFPROTO_NUMPROTO)
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return -EBUSY;
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mutex_lock(&nf_ct_proto_mutex);
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old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto],
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lockdep_is_held(&nf_ct_proto_mutex));
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if (old != &nf_conntrack_l3proto_generic) {
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ret = -EBUSY;
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goto out_unlock;
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}
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rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto);
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out_unlock:
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mutex_unlock(&nf_ct_proto_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_register);
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void nf_ct_l3proto_unregister(const struct nf_conntrack_l3proto *proto)
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{
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BUG_ON(proto->l3proto >= NFPROTO_NUMPROTO);
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mutex_lock(&nf_ct_proto_mutex);
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BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto],
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lockdep_is_held(&nf_ct_proto_mutex)
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) != proto);
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rcu_assign_pointer(nf_ct_l3protos[proto->l3proto],
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&nf_conntrack_l3proto_generic);
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mutex_unlock(&nf_ct_proto_mutex);
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synchronize_rcu();
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/* Remove all contrack entries for this protocol */
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nf_ct_iterate_destroy(kill_l3proto, (void*)proto);
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}
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister);
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static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
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const struct nf_conntrack_l4proto *l4proto)
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{
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if (l4proto->get_net_proto) {
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/* statically built-in protocols use static per-net */
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return l4proto->get_net_proto(net);
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} else if (l4proto->net_id) {
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/* ... and loadable protocols use dynamic per-net */
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return net_generic(net, *l4proto->net_id);
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}
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return NULL;
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}
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static
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int nf_ct_l4proto_register_sysctl(struct net *net,
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struct nf_proto_net *pn,
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const struct nf_conntrack_l4proto *l4proto)
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{
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int err = 0;
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#ifdef CONFIG_SYSCTL
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if (pn->ctl_table != NULL) {
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err = nf_ct_register_sysctl(net,
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&pn->ctl_table_header,
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"net/netfilter",
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pn->ctl_table);
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if (err < 0) {
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if (!pn->users) {
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kfree(pn->ctl_table);
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pn->ctl_table = NULL;
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}
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}
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}
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#endif /* CONFIG_SYSCTL */
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return err;
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}
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static
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void nf_ct_l4proto_unregister_sysctl(struct net *net,
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struct nf_proto_net *pn,
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const struct nf_conntrack_l4proto *l4proto)
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{
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#ifdef CONFIG_SYSCTL
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if (pn->ctl_table_header != NULL)
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nf_ct_unregister_sysctl(&pn->ctl_table_header,
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&pn->ctl_table,
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pn->users);
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#endif /* CONFIG_SYSCTL */
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}
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/* FIXME: Allow NULL functions and sub in pointers to generic for
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them. --RR */
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int nf_ct_l4proto_register_one(const struct nf_conntrack_l4proto *l4proto)
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{
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int ret = 0;
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if (l4proto->l3proto >= ARRAY_SIZE(nf_ct_protos))
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return -EBUSY;
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if ((l4proto->to_nlattr && l4proto->nlattr_size == 0) ||
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(l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size))
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return -EINVAL;
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mutex_lock(&nf_ct_proto_mutex);
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if (!nf_ct_protos[l4proto->l3proto]) {
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/* l3proto may be loaded latter. */
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struct nf_conntrack_l4proto __rcu **proto_array;
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int i;
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proto_array =
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kmalloc_array(MAX_NF_CT_PROTO,
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sizeof(struct nf_conntrack_l4proto *),
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GFP_KERNEL);
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if (proto_array == NULL) {
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ret = -ENOMEM;
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goto out_unlock;
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}
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for (i = 0; i < MAX_NF_CT_PROTO; i++)
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RCU_INIT_POINTER(proto_array[i],
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&nf_conntrack_l4proto_generic);
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/* Before making proto_array visible to lockless readers,
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* we must make sure its content is committed to memory.
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*/
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smp_wmb();
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nf_ct_protos[l4proto->l3proto] = proto_array;
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} else if (rcu_dereference_protected(
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nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
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lockdep_is_held(&nf_ct_proto_mutex)
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) != &nf_conntrack_l4proto_generic) {
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ret = -EBUSY;
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goto out_unlock;
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}
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rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
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l4proto);
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out_unlock:
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mutex_unlock(&nf_ct_proto_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_register_one);
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int nf_ct_l4proto_pernet_register_one(struct net *net,
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const struct nf_conntrack_l4proto *l4proto)
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{
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int ret = 0;
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struct nf_proto_net *pn = NULL;
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if (l4proto->init_net) {
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ret = l4proto->init_net(net, l4proto->l3proto);
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if (ret < 0)
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goto out;
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}
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pn = nf_ct_l4proto_net(net, l4proto);
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if (pn == NULL)
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goto out;
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ret = nf_ct_l4proto_register_sysctl(net, pn, l4proto);
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if (ret < 0)
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goto out;
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pn->users++;
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register_one);
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static void __nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *l4proto)
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{
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BUG_ON(l4proto->l3proto >= ARRAY_SIZE(nf_ct_protos));
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BUG_ON(rcu_dereference_protected(
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nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
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lockdep_is_held(&nf_ct_proto_mutex)
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) != l4proto);
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rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
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&nf_conntrack_l4proto_generic);
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}
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void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *l4proto)
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{
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mutex_lock(&nf_ct_proto_mutex);
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__nf_ct_l4proto_unregister_one(l4proto);
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mutex_unlock(&nf_ct_proto_mutex);
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synchronize_rcu();
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}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister_one);
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void nf_ct_l4proto_pernet_unregister_one(struct net *net,
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const struct nf_conntrack_l4proto *l4proto)
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{
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struct nf_proto_net *pn = nf_ct_l4proto_net(net, l4proto);
|
|
|
|
if (pn == NULL)
|
|
return;
|
|
|
|
pn->users--;
|
|
nf_ct_l4proto_unregister_sysctl(net, pn, l4proto);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister_one);
|
|
|
|
int nf_ct_l4proto_register(const struct nf_conntrack_l4proto * const l4proto[],
|
|
unsigned int num_proto)
|
|
{
|
|
int ret = -EINVAL, ver;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < num_proto; i++) {
|
|
ret = nf_ct_l4proto_register_one(l4proto[i]);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
if (i != num_proto) {
|
|
ver = l4proto[i]->l3proto == PF_INET6 ? 6 : 4;
|
|
pr_err("nf_conntrack_ipv%d: can't register l4 %d proto.\n",
|
|
ver, l4proto[i]->l4proto);
|
|
nf_ct_l4proto_unregister(l4proto, i);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_ct_l4proto_register);
|
|
|
|
int nf_ct_l4proto_pernet_register(struct net *net,
|
|
const struct nf_conntrack_l4proto *const l4proto[],
|
|
unsigned int num_proto)
|
|
{
|
|
int ret = -EINVAL;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < num_proto; i++) {
|
|
ret = nf_ct_l4proto_pernet_register_one(net, l4proto[i]);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
if (i != num_proto) {
|
|
pr_err("nf_conntrack_proto_%d %d: pernet registration failed\n",
|
|
l4proto[i]->l4proto,
|
|
l4proto[i]->l3proto == PF_INET6 ? 6 : 4);
|
|
nf_ct_l4proto_pernet_unregister(net, l4proto, i);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register);
|
|
|
|
void nf_ct_l4proto_unregister(const struct nf_conntrack_l4proto * const l4proto[],
|
|
unsigned int num_proto)
|
|
{
|
|
mutex_lock(&nf_ct_proto_mutex);
|
|
while (num_proto-- != 0)
|
|
__nf_ct_l4proto_unregister_one(l4proto[num_proto]);
|
|
mutex_unlock(&nf_ct_proto_mutex);
|
|
|
|
synchronize_net();
|
|
/* Remove all contrack entries for this protocol */
|
|
nf_ct_iterate_destroy(kill_l4proto, (void *)l4proto);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister);
|
|
|
|
void nf_ct_l4proto_pernet_unregister(struct net *net,
|
|
const struct nf_conntrack_l4proto *const l4proto[],
|
|
unsigned int num_proto)
|
|
{
|
|
while (num_proto-- != 0)
|
|
nf_ct_l4proto_pernet_unregister_one(net, l4proto[num_proto]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister);
|
|
|
|
int nf_conntrack_proto_pernet_init(struct net *net)
|
|
{
|
|
int err;
|
|
struct nf_proto_net *pn = nf_ct_l4proto_net(net,
|
|
&nf_conntrack_l4proto_generic);
|
|
|
|
err = nf_conntrack_l4proto_generic.init_net(net,
|
|
nf_conntrack_l4proto_generic.l3proto);
|
|
if (err < 0)
|
|
return err;
|
|
err = nf_ct_l4proto_register_sysctl(net,
|
|
pn,
|
|
&nf_conntrack_l4proto_generic);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
pn->users++;
|
|
return 0;
|
|
}
|
|
|
|
void nf_conntrack_proto_pernet_fini(struct net *net)
|
|
{
|
|
struct nf_proto_net *pn = nf_ct_l4proto_net(net,
|
|
&nf_conntrack_l4proto_generic);
|
|
|
|
pn->users--;
|
|
nf_ct_l4proto_unregister_sysctl(net,
|
|
pn,
|
|
&nf_conntrack_l4proto_generic);
|
|
}
|
|
|
|
int nf_conntrack_proto_init(void)
|
|
{
|
|
unsigned int i;
|
|
for (i = 0; i < NFPROTO_NUMPROTO; i++)
|
|
rcu_assign_pointer(nf_ct_l3protos[i],
|
|
&nf_conntrack_l3proto_generic);
|
|
return 0;
|
|
}
|
|
|
|
void nf_conntrack_proto_fini(void)
|
|
{
|
|
unsigned int i;
|
|
/* free l3proto protocol tables */
|
|
for (i = 0; i < ARRAY_SIZE(nf_ct_protos); i++)
|
|
kfree(nf_ct_protos[i]);
|
|
}
|