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netfilter: nft_queue: only allow supported familes and hooks

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Trying to use 'queue' statement in ingress (for example)
triggers a splat on reinject:

WARNING: CPU: 3 PID: 1345 at net/netfilter/nf_queue.c:291

... because nf_reinject cannot find the ruleset head.

The netdev family doesn't support async resume at the moment anyway,
so disallow loading such rulesets with a more appropriate
error message.

v2: add 'validate' callback and also check hook points, v1 did
allow ingress use in 'table inet', but that doesn't work either. (Pablo)

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2022-07-26 19:49:00 +02:00
parent 81ea010667
commit 47f4f510ad
1 changed files with 27 additions and 0 deletions
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27
net/netfilter/nft_queue.c
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@ -68,6 +68,31 @@ static void nft_queue_sreg_eval(const struct nft_expr *expr,
regs->verdict.code = ret;
}
static int nft_queue_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
{
static const unsigned int supported_hooks = ((1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_POST_ROUTING));
switch (ctx->family) {
case NFPROTO_IPV4:
case NFPROTO_IPV6:
case NFPROTO_INET:
case NFPROTO_BRIDGE:
break;
case NFPROTO_NETDEV: /* lacks okfn */
fallthrough;
default:
return -EOPNOTSUPP;
}
return nft_chain_validate_hooks(ctx->chain, supported_hooks);
}
static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = {
[NFTA_QUEUE_NUM] = { .type = NLA_U16 },
[NFTA_QUEUE_TOTAL] = { .type = NLA_U16 },
@ -164,6 +189,7 @@ static const struct nft_expr_ops nft_queue_ops = {
.eval = nft_queue_eval,
.init = nft_queue_init,
.dump = nft_queue_dump,
.validate = nft_queue_validate,
.reduce = NFT_REDUCE_READONLY,
};
@ -173,6 +199,7 @@ static const struct nft_expr_ops nft_queue_sreg_ops = {
.eval = nft_queue_sreg_eval,
.init = nft_queue_sreg_init,
.dump = nft_queue_sreg_dump,
.validate = nft_queue_validate,
.reduce = NFT_REDUCE_READONLY,
};