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netfilter: ebtables: Simplify the arguments to ebt_do_table 

Nearly everything thing of interest to ebt_do_table is already present
in nf_hook_state.  Simplify ebt_do_table by just passing in the skb,
nf_hook_state, and the table.  This make the code easier to read and
maintenance easier.

To support this create an nf_hook_state on the stack in ebt_broute
(the only caller without a nf_hook_state already available).  This new
nf_hook_state adds no new computations to ebt_broute, but does use a
few more bytes of stack.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Eric W. Biederman 2015-09-18 14:32:54 -05:00 committed by Pablo Neira Ayuso
parent 36aea585a1
commit 97b59c3a91
5 changed files with 20 additions and 19 deletions
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6
include/linux/netfilter_bridge/ebtables.h
View File

@ -111,9 +111,9 @@ struct ebt_table {
extern struct ebt_table *ebt_register_table(struct net *net,
const struct ebt_table *table);
extern void ebt_unregister_table(struct net *net, struct ebt_table *table);
extern unsigned int ebt_do_table(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
struct ebt_table *table);
extern unsigned int ebt_do_table(struct sk_buff *skb,
const struct nf_hook_state *state,
struct ebt_table *table);
/* Used in the kernel match() functions */
#define FWINV(bool,invflg) ((bool) ^ !!(info->invflags & invflg))

8
net/bridge/netfilter/ebtable_broute.c
View File

@ -50,10 +50,14 @@ static const struct ebt_table broute_table = {
static int ebt_broute(struct sk_buff *skb)
{
struct nf_hook_state state;
int ret;
ret = ebt_do_table(NF_BR_BROUTING, skb, skb->dev, NULL,
dev_net(skb->dev)->xt.broute_table);
nf_hook_state_init(&state, NULL, NF_BR_BROUTING, INT_MIN,
NFPROTO_BRIDGE, skb->dev, NULL, NULL,
dev_net(skb->dev), NULL);
ret = ebt_do_table(skb, &state, state.net->xt.broute_table);
if (ret == NF_DROP)
return 1; /* route it */
return 0; /* bridge it */

6
net/bridge/netfilter/ebtable_filter.c
View File

@ -60,16 +60,14 @@ static unsigned int
ebt_in_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
const struct nf_hook_state *state)
{
return ebt_do_table(ops->hooknum, skb, state->in, state->out,
state->net->xt.frame_filter);
return ebt_do_table(skb, state, state->net->xt.frame_filter);
}
static unsigned int
ebt_out_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
const struct nf_hook_state *state)
{
return ebt_do_table(ops->hooknum, skb, state->in, state->out,
state->net->xt.frame_filter);
return ebt_do_table(skb, state, state->net->xt.frame_filter);
}
static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {

6
net/bridge/netfilter/ebtable_nat.c
View File

@ -60,16 +60,14 @@ static unsigned int
ebt_nat_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
const struct nf_hook_state *state)
{
return ebt_do_table(ops->hooknum, skb, state->in, state->out,
state->net->xt.frame_nat);
return ebt_do_table(skb, state, state->net->xt.frame_nat);
}
static unsigned int
ebt_nat_out(const struct nf_hook_ops *ops, struct sk_buff *skb,
const struct nf_hook_state *state)
{
return ebt_do_table(ops->hooknum, skb, state->in, state->out,
state->net->xt.frame_nat);
return ebt_do_table(skb, state, state->net->xt.frame_nat);
}
static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {

13
net/bridge/netfilter/ebtables.c
View File

@ -183,10 +183,11 @@ struct ebt_entry *ebt_next_entry(const struct ebt_entry *entry)
}
/* Do some firewalling */
unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
struct ebt_table *table)
unsigned int ebt_do_table(struct sk_buff *skb,
const struct nf_hook_state *state,
struct ebt_table *table)
{
unsigned int hook = state->hook;
int i, nentries;
struct ebt_entry *point;
struct ebt_counter *counter_base, *cb_base;
@ -199,8 +200,8 @@ unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb,
struct xt_action_param acpar;
acpar.family = NFPROTO_BRIDGE;
acpar.in = in;
acpar.out = out;
acpar.in = state->in;
acpar.out = state->out;
acpar.hotdrop = false;
acpar.hooknum = hook;
@ -220,7 +221,7 @@ unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb,
base = private->entries;
i = 0;
while (i < nentries) {
if (ebt_basic_match(point, skb, in, out))
if (ebt_basic_match(point, skb, state->in, state->out))
goto letscontinue;
if (EBT_MATCH_ITERATE(point, ebt_do_match, skb, &acpar) != 0)