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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:24:08 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:24:08 +0000
commitf449f278dd3c70e479a035f50a9bb817a9b433ba (patch)
tree8ca2bfb785dda9bb4d573acdf9b42aea9cd51383 /src/libknot/xdp/msg_init.h
parentInitial commit. (diff)
downloadknot-f449f278dd3c70e479a035f50a9bb817a9b433ba.tar.xz
knot-f449f278dd3c70e479a035f50a9bb817a9b433ba.zip
Adding upstream version 3.2.6.upstream/3.2.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libknot/xdp/msg_init.h')
-rw-r--r--src/libknot/xdp/msg_init.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/src/libknot/xdp/msg_init.h b/src/libknot/xdp/msg_init.h
new file mode 100644
index 0000000..8b96129
--- /dev/null
+++ b/src/libknot/xdp/msg_init.h
@@ -0,0 +1,74 @@
+/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <string.h>
+
+#include "libknot/xdp/msg.h"
+#include "libknot/xdp/tcp.h"
+#include "libdnssec/random.h"
+
+inline static bool empty_msg(const knot_xdp_msg_t *msg)
+{
+ const unsigned tcp_flags = KNOT_XDP_MSG_SYN | KNOT_XDP_MSG_ACK |
+ KNOT_XDP_MSG_FIN | KNOT_XDP_MSG_RST;
+
+ return (msg->payload.iov_len == 0 && !(msg->flags & tcp_flags));
+}
+
+inline static void msg_init_base(knot_xdp_msg_t *msg, knot_xdp_msg_flag_t flags)
+{
+ memset(msg, 0, sizeof(*msg));
+
+ msg->flags = flags;
+}
+
+inline static void msg_init(knot_xdp_msg_t *msg, knot_xdp_msg_flag_t flags)
+{
+ msg_init_base(msg, flags);
+
+ if (flags & KNOT_XDP_MSG_TCP) {
+ msg->ackno = 0;
+ msg->seqno = dnssec_random_uint32_t();
+ if (flags & KNOT_XDP_MSG_SYN) {
+ msg->flags |= KNOT_XDP_MSG_MSS | KNOT_XDP_MSG_WSC;
+ }
+ }
+}
+
+inline static void msg_init_reply(knot_xdp_msg_t *msg, const knot_xdp_msg_t *query)
+{
+ msg_init_base(msg, query->flags & (KNOT_XDP_MSG_IPV6 | KNOT_XDP_MSG_TCP |
+ KNOT_XDP_MSG_MSS | KNOT_XDP_MSG_WSC));
+
+ memcpy(msg->eth_from, query->eth_to, ETH_ALEN);
+ memcpy(msg->eth_to, query->eth_from, ETH_ALEN);
+
+ memcpy(&msg->ip_from, &query->ip_to, sizeof(msg->ip_from));
+ memcpy(&msg->ip_to, &query->ip_from, sizeof(msg->ip_to));
+
+ msg->vlan_tci = query->vlan_tci;
+
+ if (msg->flags & KNOT_XDP_MSG_TCP) {
+ msg->ackno = knot_tcp_next_seqno(query);
+ msg->seqno = query->ackno;
+ if (msg->seqno == 0) {
+ msg->seqno = dnssec_random_uint32_t();
+ }
+ }
+}