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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

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Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains Netfilter updates for net-next.
Basically, more incremental updates for br_netfilter from Florian
Westphal, small nf_tables updates (including one fix for rb-tree
locking) and small two-liner to add extra validation for the REJECT6
target.

More specifically, they are:

1) Use the conntrack status flags from br_netfilter to know that DNAT is
   happening. Patch for Florian Westphal.

2) nf_bridge->physoutdev == NULL already indicates that the traffic is
   bridged, so let's get rid of the BRNF_BRIDGED flag. Also from Florian.

3) Another patch to prepare voidization of seq_printf/seq_puts/seq_putc,
   from Joe Perches.

4) Consolidation of nf_tables_newtable() error path.

5) Kill nf_bridge_pad used by br_netfilter from ip_fragment(),
   from Florian Westphal.

6) Access rb-tree root node inside the lock and remove unnecessary
   locking from the get path (we already hold nfnl_lock there), from
   Patrick McHardy.

7) You cannot use a NFT_SET_ELEM_INTERVAL_END when the set doesn't
   support interval, also from Patrick.

8) Enforce IP6T_F_PROTO from ip6t_REJECT to make sure the core is
   actually restricting matches to TCP.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-03-23 22:02:46 -04:00
commit 40451fd013
11 changed files with 77 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
include/linux/netfilter_bridge.h
View File

@ -19,23 +19,10 @@ enum nf_br_hook_priorities {
#define BRNF_PKT_TYPE 0x01
#define BRNF_BRIDGED_DNAT 0x02
#define BRNF_BRIDGED 0x04
#define BRNF_NF_BRIDGE_PREROUTING 0x08
#define BRNF_8021Q 0x10
#define BRNF_PPPoE 0x20
static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
{
switch (skb->protocol) {
case __cpu_to_be16(ETH_P_8021Q):
return VLAN_HLEN;
case __cpu_to_be16(ETH_P_PPP_SES):
return PPPOE_SES_HLEN;
default:
return 0;
}
}
static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
{
if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
@ -45,21 +32,6 @@ static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
int br_handle_frame_finish(struct sk_buff *skb);
/* This is called by the IP fragmenting code and it ensures there is
* enough room for the encapsulating header (if there is one). */
static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
{
if (skb->nf_bridge)
return nf_bridge_encap_header_len(skb);
return 0;
}
struct bridge_skb_cb {
union {
__be32 ipv4;
} daddr;
};
static inline void br_drop_fake_rtable(struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
@ -69,7 +41,6 @@ static inline void br_drop_fake_rtable(struct sk_buff *skb)
}
#else
#define nf_bridge_pad(skb) (0)
#define br_drop_fake_rtable(skb) do { } while (0)
#endif /* CONFIG_BRIDGE_NETFILTER */

48
net/bridge/br_netfilter.c
View File

@ -37,17 +37,16 @@
#include <net/route.h>
#include <net/netfilter/br_netfilter.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack.h>
#endif
#include <asm/uaccess.h>
#include "br_private.h"
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#define skb_origaddr(skb) (((struct bridge_skb_cb *) \
(skb->nf_bridge->data))->daddr.ipv4)
#define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr)
#define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr)
#ifdef CONFIG_SYSCTL
static struct ctl_table_header *brnf_sysctl_header;
static int brnf_call_iptables __read_mostly = 1;
@ -154,6 +153,18 @@ static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb)
return nf_bridge;
}
static unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
{
switch (skb->protocol) {
case __cpu_to_be16(ETH_P_8021Q):
return VLAN_HLEN;
case __cpu_to_be16(ETH_P_PPP_SES):
return PPPOE_SES_HLEN;
default:
return 0;
}
}
static inline void nf_bridge_push_encap_header(struct sk_buff *skb)
{
unsigned int len = nf_bridge_encap_header_len(skb);
@ -322,6 +333,22 @@ free_skb:
return 0;
}
static bool dnat_took_place(const struct sk_buff *skb)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
if (!ct || nf_ct_is_untracked(ct))
return false;
return test_bit(IPS_DST_NAT_BIT, &ct->status);
#else
return false;
#endif
}
/* This requires some explaining. If DNAT has taken place,
* we will need to fix up the destination Ethernet address.
*
@ -625,7 +652,7 @@ static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops,
return NF_DROP;
if (!setup_pre_routing(skb))
return NF_DROP;
store_orig_dstaddr(skb);
skb->protocol = htons(ETH_P_IP);
NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
@ -721,8 +748,6 @@ static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops,
if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb))
return NF_DROP;
/* The physdev module checks on this */
nf_bridge->mask |= BRNF_BRIDGED;
nf_bridge->physoutdev = skb->dev;
if (pf == NFPROTO_IPV4)
skb->protocol = htons(ETH_P_IP);
@ -842,7 +867,12 @@ static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops,
struct net_device *realoutdev = bridge_parent(skb->dev);
u_int8_t pf;
if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED))
/* if nf_bridge is set, but ->physoutdev is NULL, this packet came in
* on a bridge, but was delivered locally and is now being routed:
*
* POST_ROUTING was already invoked from the ip stack.
*/
if (!nf_bridge || !nf_bridge->physoutdev)
return NF_ACCEPT;
if (!realoutdev)

5
net/ipv4/ip_output.c
View File

@ -636,10 +636,7 @@ slow_path:
left = skb->len - hlen; /* Space per frame */
ptr = hlen; /* Where to start from */
/* for bridged IP traffic encapsulated inside f.e. a vlan header,
* we need to make room for the encapsulating header
*/
ll_rs = LL_RESERVED_SPACE_EXTRA(rt->dst.dev, nf_bridge_pad(skb));
ll_rs = LL_RESERVED_SPACE(rt->dst.dev);
/*
* Fragment the datagram.

4
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
View File

@ -300,7 +300,9 @@ static int exp_seq_show(struct seq_file *s, void *v)
__nf_ct_l3proto_find(exp->tuple.src.l3num),
__nf_ct_l4proto_find(exp->tuple.src.l3num,
exp->tuple.dst.protonum));
return seq_putc(s, '\n');
seq_putc(s, '\n');
return 0;
}
static const struct seq_operations exp_seq_ops = {

3
net/ipv6/netfilter/ip6t_REJECT.c
View File

@ -83,7 +83,8 @@ static int reject_tg6_check(const struct xt_tgchk_param *par)
return -EINVAL;
} else if (rejinfo->with == IP6T_TCP_RESET) {
/* Must specify that it's a TCP packet */
if (e->ipv6.proto != IPPROTO_TCP ||
if (!(e->ipv6.flags & IP6T_F_PROTO) ||
e->ipv6.proto != IPPROTO_TCP ||
(e->ipv6.invflags & XT_INV_PROTO)) {
pr_info("TCP_RESET illegal for non-tcp\n");
return -EINVAL;

8
net/netfilter/nf_conntrack_acct.c
View File

@ -47,9 +47,11 @@ seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
return 0;
counter = acct->counter;
return seq_printf(s, "packets=%llu bytes=%llu ",
(unsigned long long)atomic64_read(&counter[dir].packets),
(unsigned long long)atomic64_read(&counter[dir].bytes));
seq_printf(s, "packets=%llu bytes=%llu ",
(unsigned long long)atomic64_read(&counter[dir].packets),
(unsigned long long)atomic64_read(&counter[dir].bytes));
return 0;
};
EXPORT_SYMBOL_GPL(seq_print_acct);

4
net/netfilter/nf_conntrack_expect.c
View File

@ -561,7 +561,9 @@ static int exp_seq_show(struct seq_file *s, void *v)
helper->expect_policy[expect->class].name);
}
return seq_putc(s, '\n');
seq_putc(s, '\n');
return 0;
}
static const struct seq_operations exp_seq_ops = {

23
net/netfilter/nf_tables_api.c
View File

@ -687,11 +687,10 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
if (!try_module_get(afi->owner))
return -EAFNOSUPPORT;
err = -ENOMEM;
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (table == NULL) {
module_put(afi->owner);
return -ENOMEM;
}
if (table == NULL)
goto err1;
nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
INIT_LIST_HEAD(&table->chains);
@ -700,13 +699,16 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
if (err < 0) {
kfree(table);
module_put(afi->owner);
return err;
}
if (err < 0)
goto err2;
list_add_tail_rcu(&table->list, &afi->tables);
return 0;
err2:
kfree(table);
err1:
module_put(afi->owner);
return err;
}
static int nft_flush_table(struct nft_ctx *ctx)
@ -3136,6 +3138,9 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
elem.flags = ntohl(nla_get_be32(nla[NFTA_SET_ELEM_FLAGS]));
if (elem.flags & ~NFT_SET_ELEM_INTERVAL_END)
return -EINVAL;
if (!(set->flags & NFT_SET_INTERVAL) &&
elem.flags & NFT_SET_ELEM_INTERVAL_END)
return -EINVAL;
}
if (set->flags & NFT_SET_MAP) {

12
net/netfilter/nfnetlink_log.c
View File

@ -998,11 +998,13 @@ static int seq_show(struct seq_file *s, void *v)
{
const struct nfulnl_instance *inst = v;
return seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
inst->group_num,
inst->peer_portid, inst->qlen,
inst->copy_mode, inst->copy_range,
inst->flushtimeout, atomic_read(&inst->use));
seq_printf(s, "%5d %6d %5d %1d %5d %6d %2d\n",
inst->group_num,
inst->peer_portid, inst->qlen,
inst->copy_mode, inst->copy_range,
inst->flushtimeout, atomic_read(&inst->use));
return 0;
}
static const struct seq_operations nful_seq_ops = {

6
net/netfilter/nft_rbtree.c
View File

@ -37,10 +37,11 @@ static bool nft_rbtree_lookup(const struct nft_set *set,
{
const struct nft_rbtree *priv = nft_set_priv(set);
const struct nft_rbtree_elem *rbe, *interval = NULL;
const struct rb_node *parent = priv->root.rb_node;
const struct rb_node *parent;
int d;
spin_lock_bh(&nft_rbtree_lock);
parent = priv->root.rb_node;
while (parent != NULL) {
rbe = rb_entry(parent, struct nft_rbtree_elem, node);
@ -158,7 +159,6 @@ static int nft_rbtree_get(const struct nft_set *set, struct nft_set_elem *elem)
struct nft_rbtree_elem *rbe;
int d;
spin_lock_bh(&nft_rbtree_lock);
while (parent != NULL) {
rbe = rb_entry(parent, struct nft_rbtree_elem, node);
@ -173,11 +173,9 @@ static int nft_rbtree_get(const struct nft_set *set, struct nft_set_elem *elem)
!(rbe->flags & NFT_SET_ELEM_INTERVAL_END))
nft_data_copy(&elem->data, rbe->data);
elem->flags = rbe->flags;
spin_unlock_bh(&nft_rbtree_lock);
return 0;
}
}
spin_unlock_bh(&nft_rbtree_lock);
return -ENOENT;
}

3
net/netfilter/xt_physdev.c
View File

@ -56,8 +56,7 @@ physdev_mt(const struct sk_buff *skb, struct xt_action_param *par)
/* This only makes sense in the FORWARD and POSTROUTING chains */
if ((info->bitmask & XT_PHYSDEV_OP_BRIDGED) &&
(!!(nf_bridge->mask & BRNF_BRIDGED) ^
!(info->invert & XT_PHYSDEV_OP_BRIDGED)))
(!!nf_bridge->physoutdev ^ !(info->invert & XT_PHYSDEV_OP_BRIDGED)))
return false;
if ((info->bitmask & XT_PHYSDEV_OP_ISIN &&