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From 87a2128fcfd4c5b0847a8c611652ade8c54d8185 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Fri, 2 Oct 2020 09:44:38 +0200
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Subject: [PATCH] nft: Optimize class-based IP prefix matches
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Payload expression works on byte-boundaries, leverage this with suitable
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prefix lengths.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit 323259001d617ae359430a03ee3d3e7f107684e0)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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iptables/nft-arp.c | 11 ++++++++---
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iptables/nft-ipv4.c | 6 ++++--
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iptables/nft-ipv6.c | 6 ++++--
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iptables/nft-shared.c | 14 ++++++++++----
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iptables/nft-shared.h | 4 ++++
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5 files changed, 30 insertions(+), 11 deletions(-)
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diff --git a/iptables/nft-arp.c b/iptables/nft-arp.c
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index d4a86610ec217..ac400e484a4fa 100644
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--- a/iptables/nft-arp.c
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+++ b/iptables/nft-arp.c
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@@ -303,7 +303,8 @@ static bool nft_arp_parse_devaddr(struct nft_xt_ctx *ctx,
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memcpy(info->mask, ctx->bitwise.mask, ETH_ALEN);
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ctx->flags &= ~NFT_XT_CTX_BITWISE;
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} else {
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- memset(info->mask, 0xff, ETH_ALEN);
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+ memset(info->mask, 0xff,
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+ min(ctx->payload.len, ETH_ALEN));
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}
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return inv;
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@@ -360,7 +361,9 @@ static void nft_arp_parse_payload(struct nft_xt_ctx *ctx,
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parse_mask_ipv4(ctx, &fw->arp.smsk);
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ctx->flags &= ~NFT_XT_CTX_BITWISE;
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} else {
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- fw->arp.smsk.s_addr = 0xffffffff;
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+ memset(&fw->arp.smsk, 0xff,
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+ min(ctx->payload.len,
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+ sizeof(struct in_addr)));
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}
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if (inv)
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@@ -380,7 +383,9 @@ static void nft_arp_parse_payload(struct nft_xt_ctx *ctx,
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parse_mask_ipv4(ctx, &fw->arp.tmsk);
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ctx->flags &= ~NFT_XT_CTX_BITWISE;
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} else {
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- fw->arp.tmsk.s_addr = 0xffffffff;
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+ memset(&fw->arp.tmsk, 0xff,
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+ min(ctx->payload.len,
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+ sizeof(struct in_addr)));
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}
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if (inv)
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diff --git a/iptables/nft-ipv4.c b/iptables/nft-ipv4.c
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index 70634f8fad84d..c84af2df90da7 100644
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--- a/iptables/nft-ipv4.c
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+++ b/iptables/nft-ipv4.c
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@@ -199,7 +199,8 @@ static void nft_ipv4_parse_payload(struct nft_xt_ctx *ctx,
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parse_mask_ipv4(ctx, &cs->fw.ip.smsk);
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ctx->flags &= ~NFT_XT_CTX_BITWISE;
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} else {
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- cs->fw.ip.smsk.s_addr = 0xffffffff;
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+ memset(&cs->fw.ip.smsk, 0xff,
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+ min(ctx->payload.len, sizeof(struct in_addr)));
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}
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if (inv)
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@@ -212,7 +213,8 @@ static void nft_ipv4_parse_payload(struct nft_xt_ctx *ctx,
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parse_mask_ipv4(ctx, &cs->fw.ip.dmsk);
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ctx->flags &= ~NFT_XT_CTX_BITWISE;
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} else {
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- cs->fw.ip.dmsk.s_addr = 0xffffffff;
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+ memset(&cs->fw.ip.dmsk, 0xff,
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+ min(ctx->payload.len, sizeof(struct in_addr)));
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}
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if (inv)
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diff --git a/iptables/nft-ipv6.c b/iptables/nft-ipv6.c
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index d01491bfdb689..cfced245a781c 100644
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--- a/iptables/nft-ipv6.c
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+++ b/iptables/nft-ipv6.c
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@@ -146,7 +146,8 @@ static void nft_ipv6_parse_payload(struct nft_xt_ctx *ctx,
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parse_mask_ipv6(ctx, &cs->fw6.ipv6.smsk);
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ctx->flags &= ~NFT_XT_CTX_BITWISE;
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} else {
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- memset(&cs->fw6.ipv6.smsk, 0xff, sizeof(struct in6_addr));
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+ memset(&cs->fw6.ipv6.smsk, 0xff,
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+ min(ctx->payload.len, sizeof(struct in6_addr)));
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}
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if (inv)
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@@ -159,7 +160,8 @@ static void nft_ipv6_parse_payload(struct nft_xt_ctx *ctx,
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parse_mask_ipv6(ctx, &cs->fw6.ipv6.dmsk);
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ctx->flags &= ~NFT_XT_CTX_BITWISE;
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} else {
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- memset(&cs->fw6.ipv6.dmsk, 0xff, sizeof(struct in6_addr));
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+ memset(&cs->fw6.ipv6.dmsk, 0xff,
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+ min(ctx->payload.len, sizeof(struct in6_addr)));
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}
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if (inv)
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diff --git a/iptables/nft-shared.c b/iptables/nft-shared.c
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index f60f5df97fb86..b1237049d0a34 100644
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--- a/iptables/nft-shared.c
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+++ b/iptables/nft-shared.c
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@@ -166,16 +166,22 @@ void add_addr(struct nftnl_rule *r, int offset,
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void *data, void *mask, size_t len, uint32_t op)
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{
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const unsigned char *m = mask;
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+ bool bitwise = false;
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int i;
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- add_payload(r, offset, len, NFT_PAYLOAD_NETWORK_HEADER);
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-
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for (i = 0; i < len; i++) {
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- if (m[i] != 0xff)
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+ if (m[i] != 0xff) {
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+ bitwise = m[i] != 0;
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break;
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+ }
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}
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- if (i != len)
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+ if (!bitwise)
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+ len = i;
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+
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+ add_payload(r, offset, len, NFT_PAYLOAD_NETWORK_HEADER);
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+
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+ if (bitwise)
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add_bitwise(r, mask, len);
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add_cmp_ptr(r, op, data, len);
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diff --git a/iptables/nft-shared.h b/iptables/nft-shared.h
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index bee99a7dd0c93..c7f1e366b75ee 100644
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--- a/iptables/nft-shared.h
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+++ b/iptables/nft-shared.h
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@@ -252,4 +252,8 @@ void xtables_restore_parse(struct nft_handle *h,
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const struct nft_xt_restore_parse *p);
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void nft_check_xt_legacy(int family, bool is_ipt_save);
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+
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+#define min(x, y) ((x) < (y) ? (x) : (y))
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+#define max(x, y) ((x) > (y) ? (x) : (y))
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+
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#endif
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--
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2.28.0
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