diff options
| author | Laura Garcia Liebana <nevola@gmail.com> | 2017-02-28 18:42:50 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2017-03-06 18:25:05 +0100 |
| commit | 3a86406729782ee2671ec7161c76529c2e4a44e4 (patch) | |
| tree | 931f8f89b8ab46e248830aaf4d99570d32beb6a6 /src/evaluate.c | |
| parent | 24091fb6d084890ce167364ac78fed8ceb94ae85 (diff) | |
src: hash: support of symmetric hash
This patch provides symmetric hash support according to source
ip address and port, and destination ip address and port.
The new attribute NFTA_HASH_TYPE has been included to support
different types of hashing functions. Currently supported
NFT_HASH_JENKINS through jhash and NFT_HASH_SYM through symhash.
The main difference between both types are:
- jhash requires an expression with sreg, symhash doesn't.
- symhash supports modulus and offset, but not seed.
Examples:
nft add rule ip nat prerouting ct mark set jhash ip saddr mod 2
nft add rule ip nat prerouting ct mark set symhash mod 2
Signed-off-by: Laura Garcia Liebana <laura.garcia@zevenet.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/evaluate.c')
| -rw-r--r-- | src/evaluate.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/evaluate.c b/src/evaluate.c index 54985166..efcafc72 100644 --- a/src/evaluate.c +++ b/src/evaluate.c @@ -1288,7 +1288,8 @@ static int expr_evaluate_hash(struct eval_ctx *ctx, struct expr **exprp) expr_dtype_integer_compatible(ctx, expr); expr_set_context(&ctx->ectx, NULL, 0); - if (expr_evaluate(ctx, &expr->hash.expr) < 0) + if (expr->hash.expr && + expr_evaluate(ctx, &expr->hash.expr) < 0) return -1; /* expr_evaluate_primary() sets the context to what to the input |