diff options
| author | Florian Westphal <fw@strlen.de> | 2022-07-26 19:49:00 +0200 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2022-07-26 21:12:42 +0200 |
| commit | 47f4f510ad586032b85c89a0773fbb011d412425 (patch) | |
| tree | 7b5cf8909cb4ea535ab69853e72ce215947faed0 /net | |
| parent | 81ea010667417ef3f218dfd99b69769fe66c2b67 (diff) | |
netfilter: nft_queue: only allow supported familes and hooks
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nft_queue.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/net/netfilter/nft_queue.c b/net/netfilter/nft_queue.c index 15e4b7640dc0..da29e92c03e2 100644 --- a/net/netfilter/nft_queue.c +++ b/net/netfilter/nft_queue.c @@ -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, }; |