// SPDX-License-Identifier: GPL-2.0-only
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/*
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* (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This software has been sponsored by Sophos Astaro <http://www.sophos.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nf_tables.h>
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#include <linux/netfilter/nf_tables_compat.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter_bridge/ebtables.h>
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#include <linux/netfilter_arp/arp_tables.h>
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#include <net/netfilter/nf_tables.h>
|
|
/* Used for matches where *info is larger than X byte */
|
#define NFT_MATCH_LARGE_THRESH 192
|
|
struct nft_xt_match_priv {
|
void *info;
|
};
|
|
static int nft_compat_chain_validate_dependency(const struct nft_ctx *ctx,
|
const char *tablename)
|
{
|
enum nft_chain_types type = NFT_CHAIN_T_DEFAULT;
|
const struct nft_chain *chain = ctx->chain;
|
const struct nft_base_chain *basechain;
|
|
if (!tablename ||
|
!nft_is_base_chain(chain))
|
return 0;
|
|
basechain = nft_base_chain(chain);
|
if (strcmp(tablename, "nat") == 0) {
|
if (ctx->family != NFPROTO_BRIDGE)
|
type = NFT_CHAIN_T_NAT;
|
if (basechain->type->type != type)
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
union nft_entry {
|
struct ipt_entry e4;
|
struct ip6t_entry e6;
|
struct ebt_entry ebt;
|
struct arpt_entry arp;
|
};
|
|
static inline void
|
nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info)
|
{
|
par->target = xt;
|
par->targinfo = xt_info;
|
par->hotdrop = false;
|
}
|
|
static void nft_target_eval_xt(const struct nft_expr *expr,
|
struct nft_regs *regs,
|
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 XT_CONTINUE:
|
regs->verdict.code = NFT_CONTINUE;
|
break;
|
default:
|
regs->verdict.code = ret;
|
break;
|
}
|
}
|
|
static void nft_target_eval_bridge(const struct nft_expr *expr,
|
struct nft_regs *regs,
|
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:
|
regs->verdict.code = NF_ACCEPT;
|
break;
|
case EBT_DROP:
|
regs->verdict.code = NF_DROP;
|
break;
|
case EBT_CONTINUE:
|
regs->verdict.code = NFT_CONTINUE;
|
break;
|
case EBT_RETURN:
|
regs->verdict.code = NFT_RETURN;
|
break;
|
default:
|
regs->verdict.code = ret;
|
break;
|
}
|
}
|
|
static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
|
[NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING },
|
[NFTA_TARGET_REV] = { .type = NLA_U32 },
|
[NFTA_TARGET_INFO] = { .type = NLA_BINARY },
|
};
|
|
static void
|
nft_target_set_tgchk_param(struct xt_tgchk_param *par,
|
const struct nft_ctx *ctx,
|
struct xt_target *target, void *info,
|
union nft_entry *entry, u16 proto, bool inv)
|
{
|
par->net = ctx->net;
|
par->table = ctx->table->name;
|
switch (ctx->family) {
|
case AF_INET:
|
entry->e4.ip.proto = proto;
|
entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
|
break;
|
case AF_INET6:
|
if (proto)
|
entry->e6.ipv6.flags |= IP6T_F_PROTO;
|
|
entry->e6.ipv6.proto = proto;
|
entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
|
break;
|
case NFPROTO_BRIDGE:
|
entry->ebt.ethproto = (__force __be16)proto;
|
entry->ebt.invflags = inv ? EBT_IPROTO : 0;
|
break;
|
case NFPROTO_ARP:
|
break;
|
}
|
par->entryinfo = entry;
|
par->target = target;
|
par->targinfo = info;
|
if (nft_is_base_chain(ctx->chain)) {
|
const struct nft_base_chain *basechain =
|
nft_base_chain(ctx->chain);
|
const struct nf_hook_ops *ops = &basechain->ops;
|
|
par->hook_mask = 1 << ops->hooknum;
|
} else {
|
par->hook_mask = 0;
|
}
|
par->family = ctx->family;
|
par->nft_compat = true;
|
}
|
|
static void target_compat_from_user(struct xt_target *t, void *in, void *out)
|
{
|
int pad;
|
|
memcpy(out, in, t->targetsize);
|
pad = XT_ALIGN(t->targetsize) - t->targetsize;
|
if (pad > 0)
|
memset(out + t->targetsize, 0, pad);
|
}
|
|
static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = {
|
[NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 },
|
[NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 },
|
};
|
|
static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
|
{
|
struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
|
u32 flags;
|
int err;
|
|
err = nla_parse_nested_deprecated(tb, NFTA_RULE_COMPAT_MAX, attr,
|
nft_rule_compat_policy, NULL);
|
if (err < 0)
|
return err;
|
|
if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS])
|
return -EINVAL;
|
|
flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
|
if (flags & ~NFT_RULE_COMPAT_F_MASK)
|
return -EINVAL;
|
if (flags & NFT_RULE_COMPAT_F_INV)
|
*inv = true;
|
|
*proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
|
return 0;
|
}
|
|
static void nft_compat_wait_for_destructors(void)
|
{
|
/* xtables matches or targets can have side effects, e.g.
|
* creation/destruction of /proc files.
|
* The xt ->destroy functions are run asynchronously from
|
* work queue. If we have pending invocations we thus
|
* need to wait for those to finish.
|
*/
|
nf_tables_trans_destroy_flush_work();
|
}
|
|
static int
|
nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
|
const struct nlattr * const tb[])
|
{
|
void *info = nft_expr_priv(expr);
|
struct xt_target *target = expr->ops->data;
|
struct xt_tgchk_param par;
|
size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
|
u16 proto = 0;
|
bool inv = false;
|
union nft_entry e = {};
|
int ret;
|
|
target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
|
|
if (ctx->nla[NFTA_RULE_COMPAT]) {
|
ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
|
if (ret < 0)
|
return ret;
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}
|
|
nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
|
|
nft_compat_wait_for_destructors();
|
|
ret = xt_check_target(&par, size, proto, inv);
|
if (ret < 0)
|
return ret;
|
|
/* The standard target cannot be used */
|
if (!target->target)
|
return -EINVAL;
|
|
return 0;
|
}
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|
static void __nft_mt_tg_destroy(struct module *me, const struct nft_expr *expr)
|
{
|
module_put(me);
|
kfree(expr->ops);
|
}
|
|
static void
|
nft_target_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
|
{
|
struct xt_target *target = expr->ops->data;
|
void *info = nft_expr_priv(expr);
|
struct module *me = target->me;
|
struct xt_tgdtor_param par;
|
|
par.net = ctx->net;
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par.target = target;
|
par.targinfo = info;
|
par.family = ctx->family;
|
if (par.target->destroy != NULL)
|
par.target->destroy(&par);
|
|
__nft_mt_tg_destroy(me, expr);
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}
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|
static int nft_extension_dump_info(struct sk_buff *skb, int attr,
|
const void *info,
|
unsigned int size, unsigned int user_size)
|
{
|
unsigned int info_size, aligned_size = XT_ALIGN(size);
|
struct nlattr *nla;
|
|
nla = nla_reserve(skb, attr, aligned_size);
|
if (!nla)
|
return -1;
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|
info_size = user_size ? : size;
|
memcpy(nla_data(nla), info, info_size);
|
memset(nla_data(nla) + info_size, 0, aligned_size - info_size);
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|
return 0;
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}
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static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
{
|
const struct xt_target *target = expr->ops->data;
|
void *info = nft_expr_priv(expr);
|
|
if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
|
nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
|
nft_extension_dump_info(skb, NFTA_TARGET_INFO, info,
|
target->targetsize, target->usersize))
|
goto nla_put_failure;
|
|
return 0;
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|
nla_put_failure:
|
return -1;
|
}
|
|
static int nft_target_validate(const struct nft_ctx *ctx,
|
const struct nft_expr *expr,
|
const struct nft_data **data)
|
{
|
struct xt_target *target = expr->ops->data;
|
unsigned int hook_mask = 0;
|
int ret;
|
|
if (nft_is_base_chain(ctx->chain)) {
|
const struct nft_base_chain *basechain =
|
nft_base_chain(ctx->chain);
|
const struct nf_hook_ops *ops = &basechain->ops;
|
|
hook_mask = 1 << ops->hooknum;
|
if (target->hooks && !(hook_mask & target->hooks))
|
return -EINVAL;
|
|
ret = nft_compat_chain_validate_dependency(ctx, target->table);
|
if (ret < 0)
|
return ret;
|
}
|
return 0;
|
}
|
|
static void __nft_match_eval(const struct nft_expr *expr,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt,
|
void *info)
|
{
|
struct xt_match *match = expr->ops->data;
|
struct sk_buff *skb = pkt->skb;
|
bool ret;
|
|
nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info);
|
|
ret = match->match(skb, (struct xt_action_param *)&pkt->xt);
|
|
if (pkt->xt.hotdrop) {
|
regs->verdict.code = NF_DROP;
|
return;
|
}
|
|
switch (ret ? 1 : 0) {
|
case 1:
|
regs->verdict.code = NFT_CONTINUE;
|
break;
|
case 0:
|
regs->verdict.code = NFT_BREAK;
|
break;
|
}
|
}
|
|
static void nft_match_large_eval(const struct nft_expr *expr,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
struct nft_xt_match_priv *priv = nft_expr_priv(expr);
|
|
__nft_match_eval(expr, regs, pkt, priv->info);
|
}
|
|
static void nft_match_eval(const struct nft_expr *expr,
|
struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
__nft_match_eval(expr, regs, pkt, nft_expr_priv(expr));
|
}
|
|
static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
|
[NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
|
[NFTA_MATCH_REV] = { .type = NLA_U32 },
|
[NFTA_MATCH_INFO] = { .type = NLA_BINARY },
|
};
|
|
/* struct xt_mtchk_param and xt_tgchk_param look very similar */
|
static void
|
nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
|
struct xt_match *match, void *info,
|
union nft_entry *entry, u16 proto, bool inv)
|
{
|
par->net = ctx->net;
|
par->table = ctx->table->name;
|
switch (ctx->family) {
|
case AF_INET:
|
entry->e4.ip.proto = proto;
|
entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
|
break;
|
case AF_INET6:
|
if (proto)
|
entry->e6.ipv6.flags |= IP6T_F_PROTO;
|
|
entry->e6.ipv6.proto = proto;
|
entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
|
break;
|
case NFPROTO_BRIDGE:
|
entry->ebt.ethproto = (__force __be16)proto;
|
entry->ebt.invflags = inv ? EBT_IPROTO : 0;
|
break;
|
case NFPROTO_ARP:
|
break;
|
}
|
par->entryinfo = entry;
|
par->match = match;
|
par->matchinfo = info;
|
if (nft_is_base_chain(ctx->chain)) {
|
const struct nft_base_chain *basechain =
|
nft_base_chain(ctx->chain);
|
const struct nf_hook_ops *ops = &basechain->ops;
|
|
par->hook_mask = 1 << ops->hooknum;
|
} else {
|
par->hook_mask = 0;
|
}
|
par->family = ctx->family;
|
par->nft_compat = true;
|
}
|
|
static void match_compat_from_user(struct xt_match *m, void *in, void *out)
|
{
|
int pad;
|
|
memcpy(out, in, m->matchsize);
|
pad = XT_ALIGN(m->matchsize) - m->matchsize;
|
if (pad > 0)
|
memset(out + m->matchsize, 0, pad);
|
}
|
|
static int
|
__nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
|
const struct nlattr * const tb[],
|
void *info)
|
{
|
struct xt_match *match = expr->ops->data;
|
struct xt_mtchk_param par;
|
size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
|
u16 proto = 0;
|
bool inv = false;
|
union nft_entry e = {};
|
int ret;
|
|
match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
|
|
if (ctx->nla[NFTA_RULE_COMPAT]) {
|
ret = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &proto, &inv);
|
if (ret < 0)
|
return ret;
|
}
|
|
nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
|
|
nft_compat_wait_for_destructors();
|
|
return xt_check_match(&par, size, proto, inv);
|
}
|
|
static int
|
nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
|
const struct nlattr * const tb[])
|
{
|
return __nft_match_init(ctx, expr, tb, nft_expr_priv(expr));
|
}
|
|
static int
|
nft_match_large_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
|
const struct nlattr * const tb[])
|
{
|
struct nft_xt_match_priv *priv = nft_expr_priv(expr);
|
struct xt_match *m = expr->ops->data;
|
int ret;
|
|
priv->info = kmalloc(XT_ALIGN(m->matchsize), GFP_KERNEL);
|
if (!priv->info)
|
return -ENOMEM;
|
|
ret = __nft_match_init(ctx, expr, tb, priv->info);
|
if (ret)
|
kfree(priv->info);
|
return ret;
|
}
|
|
static void
|
__nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr,
|
void *info)
|
{
|
struct xt_match *match = expr->ops->data;
|
struct module *me = match->me;
|
struct xt_mtdtor_param par;
|
|
par.net = ctx->net;
|
par.match = match;
|
par.matchinfo = info;
|
par.family = ctx->family;
|
if (par.match->destroy != NULL)
|
par.match->destroy(&par);
|
|
__nft_mt_tg_destroy(me, expr);
|
}
|
|
static void
|
nft_match_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
|
{
|
__nft_match_destroy(ctx, expr, nft_expr_priv(expr));
|
}
|
|
static void
|
nft_match_large_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
|
{
|
struct nft_xt_match_priv *priv = nft_expr_priv(expr);
|
|
__nft_match_destroy(ctx, expr, priv->info);
|
kfree(priv->info);
|
}
|
|
static int __nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr,
|
void *info)
|
{
|
struct xt_match *match = expr->ops->data;
|
|
if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
|
nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
|
nft_extension_dump_info(skb, NFTA_MATCH_INFO, info,
|
match->matchsize, match->usersize))
|
goto nla_put_failure;
|
|
return 0;
|
|
nla_put_failure:
|
return -1;
|
}
|
|
static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
{
|
return __nft_match_dump(skb, expr, nft_expr_priv(expr));
|
}
|
|
static int nft_match_large_dump(struct sk_buff *skb, const struct nft_expr *e)
|
{
|
struct nft_xt_match_priv *priv = nft_expr_priv(e);
|
|
return __nft_match_dump(skb, e, priv->info);
|
}
|
|
static int nft_match_validate(const struct nft_ctx *ctx,
|
const struct nft_expr *expr,
|
const struct nft_data **data)
|
{
|
struct xt_match *match = expr->ops->data;
|
unsigned int hook_mask = 0;
|
int ret;
|
|
if (nft_is_base_chain(ctx->chain)) {
|
const struct nft_base_chain *basechain =
|
nft_base_chain(ctx->chain);
|
const struct nf_hook_ops *ops = &basechain->ops;
|
|
hook_mask = 1 << ops->hooknum;
|
if (match->hooks && !(hook_mask & match->hooks))
|
return -EINVAL;
|
|
ret = nft_compat_chain_validate_dependency(ctx, match->table);
|
if (ret < 0)
|
return ret;
|
}
|
return 0;
|
}
|
|
static int
|
nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
|
int event, u16 family, const char *name,
|
int rev, int target)
|
{
|
struct nlmsghdr *nlh;
|
unsigned int flags = portid ? NLM_F_MULTI : 0;
|
|
event = nfnl_msg_type(NFNL_SUBSYS_NFT_COMPAT, event);
|
nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
|
NFNETLINK_V0, 0);
|
if (!nlh)
|
goto nlmsg_failure;
|
|
if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
|
nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
|
nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
|
goto nla_put_failure;
|
|
nlmsg_end(skb, nlh);
|
return skb->len;
|
|
nlmsg_failure:
|
nla_put_failure:
|
nlmsg_cancel(skb, nlh);
|
return -1;
|
}
|
|
static int nfnl_compat_get_rcu(struct net *net, struct sock *nfnl,
|
struct sk_buff *skb, const struct nlmsghdr *nlh,
|
const struct nlattr * const tb[],
|
struct netlink_ext_ack *extack)
|
{
|
int ret = 0, target;
|
struct nfgenmsg *nfmsg;
|
const char *fmt;
|
const char *name;
|
u32 rev;
|
struct sk_buff *skb2;
|
|
if (tb[NFTA_COMPAT_NAME] == NULL ||
|
tb[NFTA_COMPAT_REV] == NULL ||
|
tb[NFTA_COMPAT_TYPE] == NULL)
|
return -EINVAL;
|
|
name = nla_data(tb[NFTA_COMPAT_NAME]);
|
rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
|
target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
|
|
nfmsg = nlmsg_data(nlh);
|
|
switch(nfmsg->nfgen_family) {
|
case AF_INET:
|
fmt = "ipt_%s";
|
break;
|
case AF_INET6:
|
fmt = "ip6t_%s";
|
break;
|
case NFPROTO_BRIDGE:
|
fmt = "ebt_%s";
|
break;
|
case NFPROTO_ARP:
|
fmt = "arpt_%s";
|
break;
|
default:
|
pr_err("nft_compat: unsupported protocol %d\n",
|
nfmsg->nfgen_family);
|
return -EINVAL;
|
}
|
|
if (!try_module_get(THIS_MODULE))
|
return -EINVAL;
|
|
rcu_read_unlock();
|
try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name,
|
rev, target, &ret),
|
fmt, name);
|
if (ret < 0)
|
goto out_put;
|
|
skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
if (skb2 == NULL) {
|
ret = -ENOMEM;
|
goto out_put;
|
}
|
|
/* include the best revision for this extension in the message */
|
if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
|
nlh->nlmsg_seq,
|
NFNL_MSG_TYPE(nlh->nlmsg_type),
|
NFNL_MSG_COMPAT_GET,
|
nfmsg->nfgen_family,
|
name, ret, target) <= 0) {
|
kfree_skb(skb2);
|
goto out_put;
|
}
|
|
ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid,
|
MSG_DONTWAIT);
|
if (ret > 0)
|
ret = 0;
|
out_put:
|
rcu_read_lock();
|
module_put(THIS_MODULE);
|
return ret == -EAGAIN ? -ENOBUFS : ret;
|
}
|
|
static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
|
[NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
|
.len = NFT_COMPAT_NAME_MAX-1 },
|
[NFTA_COMPAT_REV] = { .type = NLA_U32 },
|
[NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
|
};
|
|
static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
|
[NFNL_MSG_COMPAT_GET] = { .call_rcu = nfnl_compat_get_rcu,
|
.attr_count = NFTA_COMPAT_MAX,
|
.policy = nfnl_compat_policy_get },
|
};
|
|
static const struct nfnetlink_subsystem nfnl_compat_subsys = {
|
.name = "nft-compat",
|
.subsys_id = NFNL_SUBSYS_NFT_COMPAT,
|
.cb_count = NFNL_MSG_COMPAT_MAX,
|
.cb = nfnl_nft_compat_cb,
|
};
|
|
static struct nft_expr_type nft_match_type;
|
|
static const struct nft_expr_ops *
|
nft_match_select_ops(const struct nft_ctx *ctx,
|
const struct nlattr * const tb[])
|
{
|
struct nft_expr_ops *ops;
|
struct xt_match *match;
|
unsigned int matchsize;
|
char *mt_name;
|
u32 rev, family;
|
int err;
|
|
if (tb[NFTA_MATCH_NAME] == NULL ||
|
tb[NFTA_MATCH_REV] == NULL ||
|
tb[NFTA_MATCH_INFO] == NULL)
|
return ERR_PTR(-EINVAL);
|
|
mt_name = nla_data(tb[NFTA_MATCH_NAME]);
|
rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
|
family = ctx->family;
|
|
match = xt_request_find_match(family, mt_name, rev);
|
if (IS_ERR(match))
|
return ERR_PTR(-ENOENT);
|
|
if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) {
|
err = -EINVAL;
|
goto err;
|
}
|
|
ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL);
|
if (!ops) {
|
err = -ENOMEM;
|
goto err;
|
}
|
|
ops->type = &nft_match_type;
|
ops->eval = nft_match_eval;
|
ops->init = nft_match_init;
|
ops->destroy = nft_match_destroy;
|
ops->dump = nft_match_dump;
|
ops->validate = nft_match_validate;
|
ops->data = match;
|
|
matchsize = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize));
|
if (matchsize > NFT_MATCH_LARGE_THRESH) {
|
matchsize = NFT_EXPR_SIZE(sizeof(struct nft_xt_match_priv));
|
|
ops->eval = nft_match_large_eval;
|
ops->init = nft_match_large_init;
|
ops->destroy = nft_match_large_destroy;
|
ops->dump = nft_match_large_dump;
|
}
|
|
ops->size = matchsize;
|
|
return ops;
|
err:
|
module_put(match->me);
|
return ERR_PTR(err);
|
}
|
|
static void nft_match_release_ops(const struct nft_expr_ops *ops)
|
{
|
struct xt_match *match = ops->data;
|
|
module_put(match->me);
|
kfree(ops);
|
}
|
|
static struct nft_expr_type nft_match_type __read_mostly = {
|
.name = "match",
|
.select_ops = nft_match_select_ops,
|
.release_ops = nft_match_release_ops,
|
.policy = nft_match_policy,
|
.maxattr = NFTA_MATCH_MAX,
|
.owner = THIS_MODULE,
|
};
|
|
static struct nft_expr_type nft_target_type;
|
|
static const struct nft_expr_ops *
|
nft_target_select_ops(const struct nft_ctx *ctx,
|
const struct nlattr * const tb[])
|
{
|
struct nft_expr_ops *ops;
|
struct xt_target *target;
|
char *tg_name;
|
u32 rev, family;
|
int err;
|
|
if (tb[NFTA_TARGET_NAME] == NULL ||
|
tb[NFTA_TARGET_REV] == NULL ||
|
tb[NFTA_TARGET_INFO] == NULL)
|
return ERR_PTR(-EINVAL);
|
|
tg_name = nla_data(tb[NFTA_TARGET_NAME]);
|
rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
|
family = ctx->family;
|
|
if (strcmp(tg_name, XT_ERROR_TARGET) == 0 ||
|
strcmp(tg_name, XT_STANDARD_TARGET) == 0 ||
|
strcmp(tg_name, "standard") == 0)
|
return ERR_PTR(-EINVAL);
|
|
target = xt_request_find_target(family, tg_name, rev);
|
if (IS_ERR(target))
|
return ERR_PTR(-ENOENT);
|
|
if (!target->target) {
|
err = -EINVAL;
|
goto err;
|
}
|
|
if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) {
|
err = -EINVAL;
|
goto err;
|
}
|
|
ops = kzalloc(sizeof(struct nft_expr_ops), GFP_KERNEL);
|
if (!ops) {
|
err = -ENOMEM;
|
goto err;
|
}
|
|
ops->type = &nft_target_type;
|
ops->size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
|
ops->init = nft_target_init;
|
ops->destroy = nft_target_destroy;
|
ops->dump = nft_target_dump;
|
ops->validate = nft_target_validate;
|
ops->data = target;
|
|
if (family == NFPROTO_BRIDGE)
|
ops->eval = nft_target_eval_bridge;
|
else
|
ops->eval = nft_target_eval_xt;
|
|
return ops;
|
err:
|
module_put(target->me);
|
return ERR_PTR(err);
|
}
|
|
static void nft_target_release_ops(const struct nft_expr_ops *ops)
|
{
|
struct xt_target *target = ops->data;
|
|
module_put(target->me);
|
kfree(ops);
|
}
|
|
static struct nft_expr_type nft_target_type __read_mostly = {
|
.name = "target",
|
.select_ops = nft_target_select_ops,
|
.release_ops = nft_target_release_ops,
|
.policy = nft_target_policy,
|
.maxattr = NFTA_TARGET_MAX,
|
.owner = THIS_MODULE,
|
};
|
|
static int __init nft_compat_module_init(void)
|
{
|
int ret;
|
|
ret = nft_register_expr(&nft_match_type);
|
if (ret < 0)
|
return ret;
|
|
ret = nft_register_expr(&nft_target_type);
|
if (ret < 0)
|
goto err_match;
|
|
ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
|
if (ret < 0) {
|
pr_err("nft_compat: cannot register with nfnetlink.\n");
|
goto err_target;
|
}
|
|
return ret;
|
err_target:
|
nft_unregister_expr(&nft_target_type);
|
err_match:
|
nft_unregister_expr(&nft_match_type);
|
return ret;
|
}
|
|
static void __exit nft_compat_module_exit(void)
|
{
|
nfnetlink_subsys_unregister(&nfnl_compat_subsys);
|
nft_unregister_expr(&nft_target_type);
|
nft_unregister_expr(&nft_match_type);
|
}
|
|
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
|
|
module_init(nft_compat_module_init);
|
module_exit(nft_compat_module_exit);
|
|
MODULE_LICENSE("GPL");
|
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
|
MODULE_ALIAS_NFT_EXPR("match");
|
MODULE_ALIAS_NFT_EXPR("target");
|
MODULE_DESCRIPTION("x_tables over nftables support");
|
