From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: passt.top; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: passt.top; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=EQF84nB6; dkim-atps=neutral Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by passt.top (Postfix) with ESMTPS id 92F975A0276 for ; Mon, 24 Feb 2025 20:24:59 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1740425098; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ueIHOszjBoSEKXIVDcAQqNhQJFzbCFLmYfIhPzbTe4o=; b=EQF84nB6wqCod3hNN07lD13XpzIONzql2uFO6LJ+NSXqgyW/ADLIoQV+iWAosuyYq0iP6U VC6WYcfuWaXG9Dt57d+eJiFa2hx6YzJwJtZd4eW0TZyQMjIYc0BnQnSapYOMT83/rXKxQg Rv5gCqcX/JVV1mwVSBZeVF8TZqlVbCU= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-547-coTasnaENbS_FtGBQYHv4A-1; Mon, 24 Feb 2025 14:24:56 -0500 X-MC-Unique: coTasnaENbS_FtGBQYHv4A-1 X-Mimecast-MFC-AGG-ID: coTasnaENbS_FtGBQYHv4A_1740425096 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 2351819373D8 for ; Mon, 24 Feb 2025 19:24:56 +0000 (UTC) Received: from jmaloy-thinkpadp16vgen1.rmtcaqc.csb (unknown [10.22.65.244]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 9D6081954B00; Mon, 24 Feb 2025 19:24:54 +0000 (UTC) From: Jon Maloy To: passt-dev@passt.top, sbrivio@redhat.com, lvivier@redhat.com, dgibson@redhat.com, jmaloy@redhat.com Subject: [PATCH v6 3/4] tap: break out building of udp header from tap_udp6_send function Date: Mon, 24 Feb 2025 14:24:46 -0500 Message-ID: <20250224192447.3758771-4-jmaloy@redhat.com> In-Reply-To: <20250224192447.3758771-1-jmaloy@redhat.com> References: <20250224192447.3758771-1-jmaloy@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: TKlXoepXjxpYA1dSbW03c9Va1FbFO-PuG28KCcG0IMo_1740425096 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Message-ID-Hash: 5GUPEWY555DUHXBCJIZJMDF6WBCK776X X-Message-ID-Hash: 5GUPEWY555DUHXBCJIZJMDF6WBCK776X X-MailFrom: jmaloy@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: We will need to build the UDP header at other locations than in function tap_udp6_send(), so we break that part out to a separate function. Reviewed-by: David Gibson Signed-off-by: Jon Maloy --- tap.c | 40 ++++++++++++++++++++++++++++++---------- tap.h | 4 ++++ 2 files changed, 34 insertions(+), 10 deletions(-) diff --git a/tap.c b/tap.c index c0fa6ab..cb1bdba 100644 --- a/tap.c +++ b/tap.c @@ -266,27 +266,22 @@ static void *tap_push_ip6h(struct ipv6hdr *ip6h, } /** - * tap_udp6_send() - Send UDP over IPv6 packet + * tap_push_uh6() - Build UDPv6 header with checksum * @c: Execution context * @src: IPv6 source address * @sport: UDP source port * @dst: IPv6 destination address * @dport: UDP destination port * @flow: Flow label - * @in: UDP payload contents (not including UDP header) + * @in: UDP payload contents (not including UDP header) * @dlen: UDP payload length (not including UDP header) */ -void tap_udp6_send(const struct ctx *c, +void *tap_push_uh6(struct udphdr *uh, const struct in6_addr *src, in_port_t sport, const struct in6_addr *dst, in_port_t dport, - uint32_t flow, void *in, size_t dlen) + void *in, size_t dlen) { size_t l4len = dlen + sizeof(struct udphdr); - char buf[USHRT_MAX]; - struct ipv6hdr *ip6h = tap_push_l2h(c, buf, ETH_P_IPV6); - struct udphdr *uh = tap_push_ip6h(ip6h, src, dst, - l4len, IPPROTO_UDP, flow); - char *data = (char *)(uh + 1); const struct iovec iov = { .iov_base = in, .iov_len = dlen @@ -297,8 +292,33 @@ void tap_udp6_send(const struct ctx *c, uh->dest = htons(dport); uh->len = htons(l4len); csum_udp6(uh, src, dst, &payload); - memcpy(data, in, dlen); + return uh + 1; +} + +/** + * tap_udp6_send() - Send UDP over IPv6 packet + * @c: Execution context + * @src: IPv6 source address + * @sport: UDP source port + * @dst: IPv6 destination address + * @dport: UDP destination port + * @flow: Flow label + * @in: UDP payload contents (not including UDP header) + * @dlen: UDP payload length (not including UDP header) + */ +void tap_udp6_send(const struct ctx *c, + const struct in6_addr *src, in_port_t sport, + const struct in6_addr *dst, in_port_t dport, + uint32_t flow, void *in, size_t dlen) +{ + size_t l4len = dlen + sizeof(struct udphdr); + char buf[USHRT_MAX]; + struct ipv6hdr *ip6h = tap_push_l2h(c, buf, ETH_P_IPV6); + struct udphdr *uh = tap_push_ip6h(ip6h, src, dst, + l4len, IPPROTO_UDP, flow); + char *data = tap_push_uh6(uh, src, sport, dst, dport, in, dlen); + memcpy(data, in, dlen); tap_send_single(c, buf, dlen + (data - buf)); } diff --git a/tap.h b/tap.h index 37da21d..b7b8cef 100644 --- a/tap.h +++ b/tap.h @@ -47,6 +47,10 @@ static inline void tap_hdr_update(struct tap_hdr *thdr, size_t l2len) void *tap_push_uh4(struct udphdr *uh, struct in_addr src, in_port_t sport, struct in_addr dst, in_port_t dport, const void *in, size_t dlen); +void *tap_push_uh6(struct udphdr *uh, + const struct in6_addr *src, in_port_t sport, + const struct in6_addr *dst, in_port_t dport, + void *in, size_t dlen); void *tap_push_ip4h(struct iphdr *ip4h, struct in_addr src, struct in_addr dst, size_t l4len, uint8_t proto); void tap_udp4_send(const struct ctx *c, struct in_addr src, in_port_t sport, -- 2.48.1