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Message-Id: <1423546474-3539-2-git-send-email-pablo@netfilter.org>
Date: Tue, 10 Feb 2015 06:34:33 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 1/2] netfilter: nft_compat: add ebtables support
From: Arturo Borrero <arturo.borrero.glez@...il.com>
This patch extends nft_compat to support ebtables extensions.
ebtables verdict codes are translated to the ones used by the nf_tables engine,
so we can properly use ebtables target extensions from nft_compat.
This patch extends previous work by Giuseppe Longo <giuseppelng@...il.com>.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@...il.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
net/netfilter/nft_compat.c | 63 +++++++++++++++++++++++++++++++++++++++-----
1 file changed, 57 insertions(+), 6 deletions(-)
diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index 265e190..c598f74 100644
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -19,6 +19,7 @@
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_bridge/ebtables.h>
#include <net/netfilter/nf_tables.h>
static int nft_compat_chain_validate_dependency(const char *tablename,
@@ -40,6 +41,7 @@ static int nft_compat_chain_validate_dependency(const char *tablename,
union nft_entry {
struct ipt_entry e4;
struct ip6t_entry e6;
+ struct ebt_entry ebt;
};
static inline void
@@ -50,9 +52,9 @@ nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info)
par->hotdrop = false;
}
-static void nft_target_eval(const struct nft_expr *expr,
- struct nft_data data[NFT_REG_MAX + 1],
- const struct nft_pktinfo *pkt)
+static void nft_target_eval_xt(const struct nft_expr *expr,
+ struct nft_data data[NFT_REG_MAX + 1],
+ const struct nft_pktinfo *pkt)
{
void *info = nft_expr_priv(expr);
struct xt_target *target = expr->ops->data;
@@ -66,7 +68,7 @@ static void nft_target_eval(const struct nft_expr *expr,
if (pkt->xt.hotdrop)
ret = NF_DROP;
- switch(ret) {
+ switch (ret) {
case XT_CONTINUE:
data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
break;
@@ -74,7 +76,41 @@ static void nft_target_eval(const struct nft_expr *expr,
data[NFT_REG_VERDICT].verdict = ret;
break;
}
- return;
+}
+
+static void nft_target_eval_bridge(const struct nft_expr *expr,
+ struct nft_data data[NFT_REG_MAX + 1],
+ const struct nft_pktinfo *pkt)
+{
+ void *info = nft_expr_priv(expr);
+ struct xt_target *target = expr->ops->data;
+ struct sk_buff *skb = pkt->skb;
+ int ret;
+
+ nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info);
+
+ ret = target->target(skb, &pkt->xt);
+
+ if (pkt->xt.hotdrop)
+ ret = NF_DROP;
+
+ switch (ret) {
+ case EBT_ACCEPT:
+ data[NFT_REG_VERDICT].verdict = NF_ACCEPT;
+ break;
+ case EBT_DROP:
+ data[NFT_REG_VERDICT].verdict = NF_DROP;
+ break;
+ case EBT_CONTINUE:
+ data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
+ break;
+ case EBT_RETURN:
+ data[NFT_REG_VERDICT].verdict = NFT_RETURN;
+ break;
+ default:
+ data[NFT_REG_VERDICT].verdict = ret;
+ break;
+ }
}
static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
@@ -100,6 +136,10 @@ nft_target_set_tgchk_param(struct xt_tgchk_param *par,
entry->e6.ipv6.proto = proto;
entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
break;
+ case NFPROTO_BRIDGE:
+ entry->ebt.ethproto = proto;
+ entry->ebt.invflags = inv ? EBT_IPROTO : 0;
+ break;
}
par->entryinfo = entry;
par->target = target;
@@ -307,6 +347,10 @@ nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
entry->e6.ipv6.proto = proto;
entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
break;
+ case NFPROTO_BRIDGE:
+ entry->ebt.ethproto = proto;
+ entry->ebt.invflags = inv ? EBT_IPROTO : 0;
+ break;
}
par->entryinfo = entry;
par->match = match;
@@ -490,6 +534,9 @@ nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb,
case AF_INET6:
fmt = "ip6t_%s";
break;
+ case NFPROTO_BRIDGE:
+ fmt = "ebt_%s";
+ break;
default:
pr_err("nft_compat: unsupported protocol %d\n",
nfmsg->nfgen_family);
@@ -663,13 +710,17 @@ nft_target_select_ops(const struct nft_ctx *ctx,
nft_target->ops.type = &nft_target_type;
nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
- nft_target->ops.eval = nft_target_eval;
nft_target->ops.init = nft_target_init;
nft_target->ops.destroy = nft_target_destroy;
nft_target->ops.dump = nft_target_dump;
nft_target->ops.validate = nft_target_validate;
nft_target->ops.data = target;
+ if (family == NFPROTO_BRIDGE)
+ nft_target->ops.eval = nft_target_eval_bridge;
+ else
+ nft_target->ops.eval = nft_target_eval_xt;
+
list_add(&nft_target->head, &nft_target_list);
return &nft_target->ops;
--
1.7.10.4
--
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