diff options
author | Florian Westphal <fw@strlen.de> | 2022-03-14 18:23:12 +0100 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2022-03-20 00:29:47 +0100 |
commit | 3c1eb413a45b6c6327fed394705081ec6202b31a (patch) | |
tree | ab613ed42f5060095314843bb32a770677647c6e /net/netfilter/nft_fib.c | |
parent | 611580d2df1f873e035f3dca109e5fa27448e0c7 (diff) | |
download | linux-3c1eb413a45b6c6327fed394705081ec6202b31a.tar.bz2 |
netfilter: nft_fib: add reduce support
The fib expression stores to a register, so we can't add empty stub.
Check that the register that is being written is in fact redundant.
In most cases, this is expected to cancel tracking as re-use is
unlikely.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_fib.c')
-rw-r--r-- | net/netfilter/nft_fib.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/net/netfilter/nft_fib.c b/net/netfilter/nft_fib.c index b10ce732b337..f198f2d9ef90 100644 --- a/net/netfilter/nft_fib.c +++ b/net/netfilter/nft_fib.c @@ -156,5 +156,47 @@ void nft_fib_store_result(void *reg, const struct nft_fib *priv, } EXPORT_SYMBOL_GPL(nft_fib_store_result); +bool nft_fib_reduce(struct nft_regs_track *track, + const struct nft_expr *expr) +{ + const struct nft_fib *priv = nft_expr_priv(expr); + unsigned int len = NFT_REG32_SIZE; + const struct nft_fib *fib; + + switch (priv->result) { + case NFT_FIB_RESULT_OIF: + break; + case NFT_FIB_RESULT_OIFNAME: + if (priv->flags & NFTA_FIB_F_PRESENT) + len = NFT_REG32_SIZE; + else + len = IFNAMSIZ; + break; + case NFT_FIB_RESULT_ADDRTYPE: + break; + default: + WARN_ON_ONCE(1); + break; + } + + if (!nft_reg_track_cmp(track, expr, priv->dreg)) { + nft_reg_track_update(track, expr, priv->dreg, len); + return false; + } + + fib = nft_expr_priv(track->regs[priv->dreg].selector); + if (priv->result != fib->result || + priv->flags != fib->flags) { + nft_reg_track_update(track, expr, priv->dreg, len); + return false; + } + + if (!track->regs[priv->dreg].bitwise) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(nft_fib_reduce); + MODULE_LICENSE("GPL"); MODULE_AUTHOR("Florian Westphal <fw@strlen.de>"); |