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| author | Guishan Qin <guishan.qin@windriver.com> | 2020-12-11 17:35:11 +0800 |
|---|---|---|
| committer | Jason Wang <jasowang@redhat.com> | 2021-01-25 17:04:56 +0800 |
| commit | d97f11590a0f60cd911ace8bb68180b5a09a068d (patch) | |
| tree | d0a26af268b2758793c5ec8eec0050771a9f591c /net | |
| parent | 0dcf0c0aeefd2bc1023c9fe7ab0f1b6bc993c360 (diff) | |
| download | qemu-d97f11590a0f60cd911ace8bb68180b5a09a068d.zip qemu-d97f11590a0f60cd911ace8bb68180b5a09a068d.tar.gz qemu-d97f11590a0f60cd911ace8bb68180b5a09a068d.tar.bz2 | |
net: checksum: Add IP header checksum calculation
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 <guishan.qin@windriver.com>
Signed-off-by: Yabing Liu <yabing.liu@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/checksum.c | 8 |
1 files 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)) { |