net_dropmonitor blames core.c:nf_hook_slow.
Add NF_DROP_REASON() helper and use it in nft_do_chain().
The helper releases the skb, so exact drop location becomes
available. Calling code will observe the NF_STOLEN verdict
instead.
Adjust nf_hook_slow so we can embed an erro value wih
NF_STOLEN verdicts, just like we do for NF_DROP.
After this, drop in nftables can be pinpointed to a drop due
to a rule or the chain policy.
Signed-off-by: Florian Westphal <fw@strlen.de>
return -(verdict >> NF_VERDICT_QBITS);
}
+static __always_inline int
+NF_DROP_REASON(struct sk_buff *skb, enum skb_drop_reason reason, u32 err)
+{
+ BUILD_BUG_ON(err > 0xffff);
+
+ kfree_skb_reason(skb, reason);
+
+ return ((err << 16) | NF_STOLEN);
+}
+
static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
const union nf_inet_addr *a2)
{
if (ret == 1)
continue;
return ret;
+ case NF_STOLEN:
+ return NF_DROP_GETERR(verdict);
default:
- /* Implicit handling for NF_STOLEN, as well as any other
- * non conventional verdicts.
- */
+ WARN_ON_ONCE(1);
return 0;
}
}
switch (regs.verdict.code & NF_VERDICT_MASK) {
case NF_ACCEPT:
- case NF_DROP:
case NF_QUEUE:
case NF_STOLEN:
return regs.verdict.code;
+ case NF_DROP:
+ return NF_DROP_REASON(pkt->skb, SKB_DROP_REASON_NETFILTER_DROP, EPERM);
}
switch (regs.verdict.code) {
if (static_branch_unlikely(&nft_counters_enabled))
nft_update_chain_stats(basechain, pkt);
+ if (nft_base_chain(basechain)->policy == NF_DROP)
+ return NF_DROP_REASON(pkt->skb, SKB_DROP_REASON_NETFILTER_DROP, EPERM);
+
return nft_base_chain(basechain)->policy;
}
EXPORT_SYMBOL_GPL(nft_do_chain);