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WSL2-Linux-Kernel
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netfilter: nf_tables: add support for multi family tables 

Add support to register chains to multiple hooks for different address
families for mixed IPv4/IPv6 tables.

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2014-01-03 12:16:15 +00:00 коммит произвёл Pablo Neira Ayuso
Родитель c9484874e7
Коммит 115a60b173
7 изменённых файлов: 45 добавлений и 25 удалений
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9
include/net/netfilter/nf_tables.h
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@ -422,6 +422,8 @@ struct nft_stats {
u64 pkts;
};
#define NFT_HOOK_OPS_MAX 2
/**
* struct nft_base_chain - nf_tables base chain
*
@ -432,7 +434,7 @@ struct nft_stats {
* @chain: the chain
*/
struct nft_base_chain {
struct nf_hook_ops ops;
struct nf_hook_ops ops[NFT_HOOK_OPS_MAX];
enum nft_chain_type type;
u8 policy;
struct nft_stats __percpu *stats;
@ -476,6 +478,8 @@ struct nft_table {
* @nhooks: number of hooks in this family
* @owner: module owner
* @tables: used internally
* @nops: number of hook ops in this family
* @hook_ops_init: initialization function for chain hook ops
* @hooks: hookfn overrides for packet validation
*/
struct nft_af_info {
@ -484,6 +488,9 @@ struct nft_af_info {
unsigned int nhooks;
struct module *owner;
struct list_head tables;
unsigned int nops;
void (*hook_ops_init)(struct nf_hook_ops *,
unsigned int);
nf_hookfn *hooks[NF_MAX_HOOKS];
};

1
net/bridge/netfilter/nf_tables_bridge.c
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@ -32,6 +32,7 @@ static struct nft_af_info nft_af_bridge __read_mostly = {
.family = NFPROTO_BRIDGE,
.nhooks = NF_BR_NUMHOOKS,
.owner = THIS_MODULE,
.nops = 1,
.hooks = {
[NF_BR_LOCAL_IN] = nft_do_chain_bridge,
[NF_BR_FORWARD] = nft_do_chain_bridge,

1
net/ipv4/netfilter/nf_tables_arp.c
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@ -32,6 +32,7 @@ static struct nft_af_info nft_af_arp __read_mostly = {
.family = NFPROTO_ARP,
.nhooks = NF_ARP_NUMHOOKS,
.owner = THIS_MODULE,
.nops = 1,
.hooks = {
[NF_ARP_IN] = nft_do_chain_arp,
[NF_ARP_OUT] = nft_do_chain_arp,

1
net/ipv4/netfilter/nf_tables_ipv4.c
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@ -52,6 +52,7 @@ static struct nft_af_info nft_af_ipv4 __read_mostly = {
.family = NFPROTO_IPV4,
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
.nops = 1,
.hooks = {
[NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
[NF_INET_LOCAL_OUT] = nft_ipv4_output,

1
net/ipv6/netfilter/nf_tables_ipv6.c
Просмотреть файл

@ -51,6 +51,7 @@ static struct nft_af_info nft_af_ipv6 __read_mostly = {
.family = NFPROTO_IPV6,
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
.nops = 1,
.hooks = {
[NF_INET_LOCAL_IN] = nft_do_chain_ipv6,
[NF_INET_LOCAL_OUT] = nft_ipv6_output,

49
net/netfilter/nf_tables_api.c
Просмотреть файл

@ -307,7 +307,8 @@ err:
return err;
}
static int nf_tables_table_enable(struct nft_table *table)
static int nf_tables_table_enable(const struct nft_af_info *afi,
struct nft_table *table)
{
struct nft_chain *chain;
int err, i = 0;
@ -316,7 +317,7 @@ static int nf_tables_table_enable(struct nft_table *table)
if (!(chain->flags & NFT_BASE_CHAIN))
continue;
err = nf_register_hook(&nft_base_chain(chain)->ops);
err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
if (err < 0)
goto err;
@ -331,18 +332,20 @@ err:
if (i-- <= 0)
break;
nf_unregister_hook(&nft_base_chain(chain)->ops);
nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
}
return err;
}
static int nf_tables_table_disable(struct nft_table *table)
static int nf_tables_table_disable(const struct nft_af_info *afi,
struct nft_table *table)
{
struct nft_chain *chain;
list_for_each_entry(chain, &table->chains, list) {
if (chain->flags & NFT_BASE_CHAIN)
nf_unregister_hook(&nft_base_chain(chain)->ops);
nf_unregister_hooks(nft_base_chain(chain)->ops,
afi->nops);
}
return 0;
@ -365,12 +368,12 @@ static int nf_tables_updtable(struct sock *nlsk, struct sk_buff *skb,
if ((flags & NFT_TABLE_F_DORMANT) &&
!(table->flags & NFT_TABLE_F_DORMANT)) {
ret = nf_tables_table_disable(table);
ret = nf_tables_table_disable(afi, table);
if (ret >= 0)
table->flags |= NFT_TABLE_F_DORMANT;
} else if (!(flags & NFT_TABLE_F_DORMANT) &&
table->flags & NFT_TABLE_F_DORMANT) {
ret = nf_tables_table_enable(table);
ret = nf_tables_table_enable(afi, table);
if (ret >= 0)
table->flags &= ~NFT_TABLE_F_DORMANT;
}
@ -598,7 +601,7 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
if (chain->flags & NFT_BASE_CHAIN) {
const struct nft_base_chain *basechain = nft_base_chain(chain);
const struct nf_hook_ops *ops = &basechain->ops;
const struct nf_hook_ops *ops = &basechain->ops[0];
struct nlattr *nest;
nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
@ -832,6 +835,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
u64 handle = 0;
unsigned int i;
int err;
bool create;
@ -904,7 +908,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
if (nla[NFTA_CHAIN_HOOK]) {
struct nf_hook_ops *ops;
nf_hookfn *hookfn;
u32 hooknum;
u32 hooknum, priority;
int type = NFT_CHAIN_T_DEFAULT;
if (nla[NFTA_CHAIN_TYPE]) {
@ -926,6 +930,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
if (hooknum >= afi->nhooks)
return -EINVAL;
priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
if (!(chain_type[family][type]->hook_mask & (1 << hooknum)))
return -EOPNOTSUPP;
@ -938,15 +943,19 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
basechain->type = type;
chain = &basechain->chain;
ops = &basechain->ops;
ops->pf = family;
ops->owner = afi->owner;
ops->hooknum = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
ops->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
ops->priv = chain;
ops->hook = afi->hooks[ops->hooknum];
if (hookfn)
ops->hook = hookfn;
for (i = 0; i < afi->nops; i++) {
ops = &basechain->ops[i];
ops->pf = family;
ops->owner = afi->owner;
ops->hooknum = hooknum;
ops->priority = priority;
ops->priv = chain;
ops->hook = afi->hooks[ops->hooknum];
if (hookfn)
ops->hook = hookfn;
if (afi->hook_ops_init)
afi->hook_ops_init(ops, i);
}
chain->flags |= NFT_BASE_CHAIN;
@ -993,7 +1002,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
if (!(table->flags & NFT_TABLE_F_DORMANT) &&
chain->flags & NFT_BASE_CHAIN) {
err = nf_register_hook(&nft_base_chain(chain)->ops);
err = nf_register_hooks(nft_base_chain(chain)->ops, afi->nops);
if (err < 0) {
free_percpu(basechain->stats);
kfree(basechain);
@ -1052,7 +1061,7 @@ static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
if (!(table->flags & NFT_TABLE_F_DORMANT) &&
chain->flags & NFT_BASE_CHAIN)
nf_unregister_hook(&nft_base_chain(chain)->ops);
nf_unregister_hooks(nft_base_chain(chain)->ops, afi->nops);
nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_DELCHAIN,
family);

8
net/netfilter/nft_compat.c
Просмотреть файл

@ -92,7 +92,7 @@ nft_target_set_tgchk_param(struct xt_tgchk_param *par,
if (ctx->chain->flags & NFT_BASE_CHAIN) {
const struct nft_base_chain *basechain =
nft_base_chain(ctx->chain);
const struct nf_hook_ops *ops = &basechain->ops;
const struct nf_hook_ops *ops = &basechain->ops[0];
par->hook_mask = 1 << ops->hooknum;
}
@ -253,7 +253,7 @@ static int nft_target_validate(const struct nft_ctx *ctx,
if (ctx->chain->flags & NFT_BASE_CHAIN) {
const struct nft_base_chain *basechain =
nft_base_chain(ctx->chain);
const struct nf_hook_ops *ops = &basechain->ops;
const struct nf_hook_ops *ops = &basechain->ops[0];
hook_mask = 1 << ops->hooknum;
if (hook_mask & target->hooks)
@ -323,7 +323,7 @@ nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
if (ctx->chain->flags & NFT_BASE_CHAIN) {
const struct nft_base_chain *basechain =
nft_base_chain(ctx->chain);
const struct nf_hook_ops *ops = &basechain->ops;
const struct nf_hook_ops *ops = &basechain->ops[0];
par->hook_mask = 1 << ops->hooknum;
}
@ -449,7 +449,7 @@ static int nft_match_validate(const struct nft_ctx *ctx,
if (ctx->chain->flags & NFT_BASE_CHAIN) {
const struct nft_base_chain *basechain =
nft_base_chain(ctx->chain);
const struct nf_hook_ops *ops = &basechain->ops;
const struct nf_hook_ops *ops = &basechain->ops[0];
hook_mask = 1 << ops->hooknum;
if (hook_mask & match->hooks)