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author | David S. Miller <davem@davemloft.net> | 2015-03-24 03:02:46 +0100 |
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committer | David S. Miller <davem@davemloft.net> | 2015-03-24 03:02:46 +0100 |
commit | 40451fd013878b005ccae767dfebc07dfecf85d9 (patch) | |
tree | 671c687b5b9c5f690fa8827c2c71c17d87b1fb0f /net/bridge | |
parent | af_packet: pass checksum validation status to the user (diff) | |
parent | netfilter: ip6t_REJECT: check for IP6T_F_PROTO (diff) | |
download | linux-40451fd013878b005ccae767dfebc07dfecf85d9.tar.xz linux-40451fd013878b005ccae767dfebc07dfecf85d9.zip |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
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>
Diffstat (limited to 'net/bridge')
-rw-r--r-- | net/bridge/br_netfilter.c | 48 |
1 files changed, 39 insertions, 9 deletions
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c index b260a97275db..f3884a1b942f 100644 --- a/net/bridge/br_netfilter.c +++ b/net/bridge/br_netfilter.c @@ -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) |