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[147.11.124.94]) by smtp.gmail.com with ESMTPSA id g1sm4065362ioh.39.2020.12.11.01.35.22 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 11 Dec 2020 01:35:24 -0800 (PST) From: Bin Meng To: qemu-devel@nongnu.org Subject: [PATCH v2 2/3] net: checksum: Add IP header checksum calculation Date: Fri, 11 Dec 2020 17:35:11 +0800 Message-Id: <1607679312-51325-2-git-send-email-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1607679312-51325-1-git-send-email-bmeng.cn@gmail.com> References: <1607679312-51325-1-git-send-email-bmeng.cn@gmail.com> Received-SPF: pass client-ip=2607:f8b0:4864:20::142; envelope-from=bmeng.cn@gmail.com; helo=mail-il1-x142.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bin Meng , Yabing Liu , Jason Wang , Guishan Qin Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Guishan Qin At present net_checksum_calculate() only calculates TCP/UDP checksum in an IP packet, but assumes the IP header checksum to be provided by the software, e.g.: Linux kernel always calculates the IP header checksum. However this might not always be the case, e.g.: for an IP checksum offload enabled stack like VxWorks, the IP header checksum can be zero. This adds the checksum calculation of the IP header. Signed-off-by: Guishan Qin Signed-off-by: Yabing Liu Signed-off-by: Bin Meng --- (no changes since v1) net/checksum.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/checksum.c b/net/checksum.c index 5cb8b2c..dabd290 100644 --- a/net/checksum.c +++ b/net/checksum.c @@ -61,6 +61,7 @@ void net_checksum_calculate(uint8_t *data, int length) { int mac_hdr_len, ip_len; struct ip_header *ip; + uint16_t csum; /* * Note: We cannot assume "data" is aligned, so the all code uses @@ -106,6 +107,11 @@ void net_checksum_calculate(uint8_t *data, int length) return; /* not IPv4 */ } + /* Calculate IP checksum */ + stw_he_p(&ip->ip_sum, 0); + csum = net_raw_checksum((uint8_t *)ip, IP_HDR_GET_LEN(ip)); + stw_be_p(&ip->ip_sum, csum); + if (IP4_IS_FRAGMENT(ip)) { return; /* a fragmented IP packet */ } @@ -122,7 +128,6 @@ void net_checksum_calculate(uint8_t *data, int length) switch (ip->ip_p) { case IP_PROTO_TCP: { - uint16_t csum; tcp_header *tcp = (tcp_header *)(ip + 1); if (ip_len < sizeof(tcp_header)) { @@ -143,7 +148,6 @@ void net_checksum_calculate(uint8_t *data, int length) } case IP_PROTO_UDP: { - uint16_t csum; udp_header *udp = (udp_header *)(ip + 1); if (ip_len < sizeof(udp_header)) { -- 2.7.4