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netfilter: nft_compat: add ebtables support

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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@gmail.com>.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Arturo Borrero 2015-01-29 19:34:42 +01:00 committed by Pablo Neira Ayuso
parent 4c72c53be5
commit 5191f4d82d
1 changed files with 57 additions and 6 deletions
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63
net/netfilter/nft_compat.c
View File

@ -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;