diff options
author | Patrick McHardy <kaber@trash.net> | 2013-10-10 09:06:41 (GMT) |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-10-14 15:16:10 (GMT) |
commit | c29b72e02573b8fe5e6cae5d192a6a4772e7bbd6 (patch) | |
tree | cd4d3e4f18568111c0cf754a2ffe28efefd8ca41 /net/netfilter/nft_payload.c | |
parent | cb7dbfd0390c9e244339f3270fe8649568241812 (diff) | |
download | linux-c29b72e02573b8fe5e6cae5d192a6a4772e7bbd6.tar.xz |
netfilter: nft_payload: add optimized payload implementation for small loads
Add an optimized payload expression implementation for small (up to 4 bytes)
aligned data loads from the linear packet area.
This patch also includes original Patrick McHardy's entitled (nf_tables:
inline nft_payload_fast_eval() into main evaluation loop).
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_payload.c')
-rw-r--r-- | net/netfilter/nft_payload.c | 69 |
1 files changed, 42 insertions, 27 deletions
diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c index d99db6e..7cf13f7 100644 --- a/net/netfilter/nft_payload.c +++ b/net/netfilter/nft_payload.c @@ -17,13 +17,6 @@ #include <net/netfilter/nf_tables_core.h> #include <net/netfilter/nf_tables.h> -struct nft_payload { - enum nft_payload_bases base:8; - u8 offset; - u8 len; - enum nft_registers dreg:8; -}; - static void nft_payload_eval(const struct nft_expr *expr, struct nft_data data[NFT_REG_MAX + 1], const struct nft_pktinfo *pkt) @@ -71,27 +64,9 @@ static int nft_payload_init(const struct nft_ctx *ctx, struct nft_payload *priv = nft_expr_priv(expr); int err; - if (tb[NFTA_PAYLOAD_DREG] == NULL || - tb[NFTA_PAYLOAD_BASE] == NULL || - tb[NFTA_PAYLOAD_OFFSET] == NULL || - tb[NFTA_PAYLOAD_LEN] == NULL) - return -EINVAL; - - priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); - switch (priv->base) { - case NFT_PAYLOAD_LL_HEADER: - case NFT_PAYLOAD_NETWORK_HEADER: - case NFT_PAYLOAD_TRANSPORT_HEADER: - break; - default: - return -EOPNOTSUPP; - } - + priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); - if (priv->len == 0 || - priv->len > FIELD_SIZEOF(struct nft_data, data)) - return -EINVAL; priv->dreg = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_DREG])); err = nft_validate_output_register(priv->dreg); @@ -124,9 +99,49 @@ static const struct nft_expr_ops nft_payload_ops = { .dump = nft_payload_dump, }; +const struct nft_expr_ops nft_payload_fast_ops = { + .type = &nft_payload_type, + .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), + .eval = nft_payload_eval, + .init = nft_payload_init, + .dump = nft_payload_dump, +}; + +static const struct nft_expr_ops *nft_payload_select_ops(const struct nlattr * const tb[]) +{ + enum nft_payload_bases base; + unsigned int offset, len; + + if (tb[NFTA_PAYLOAD_DREG] == NULL || + tb[NFTA_PAYLOAD_BASE] == NULL || + tb[NFTA_PAYLOAD_OFFSET] == NULL || + tb[NFTA_PAYLOAD_LEN] == NULL) + return ERR_PTR(-EINVAL); + + base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); + switch (base) { + case NFT_PAYLOAD_LL_HEADER: + case NFT_PAYLOAD_NETWORK_HEADER: + case NFT_PAYLOAD_TRANSPORT_HEADER: + break; + default: + return ERR_PTR(-EOPNOTSUPP); + } + + offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); + len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); + if (len == 0 || len > FIELD_SIZEOF(struct nft_data, data)) + return ERR_PTR(-EINVAL); + + if (len <= 4 && IS_ALIGNED(offset, len) && base != NFT_PAYLOAD_LL_HEADER) + return &nft_payload_fast_ops; + else + return &nft_payload_ops; +} + static struct nft_expr_type nft_payload_type __read_mostly = { .name = "payload", - .ops = &nft_payload_ops, + .select_ops = nft_payload_select_ops, .policy = nft_payload_policy, .maxattr = NFTA_PAYLOAD_MAX, .owner = THIS_MODULE, |