From: Michael Pfeiffer <michael.pfeiffer@tu-ilmenau.de>
To: Olivier Matz <olivier.matz@6wind.com>
Cc: dev@dpdk.org, Michael Pfeiffer <michael.pfeiffer@tu-ilmenau.de>
Subject: [dpdk-dev] [PATCH] net: calculate checksums for packets with IPv4 options
Date: Fri, 21 Aug 2020 13:32:10 +0200 [thread overview]
Message-ID: <20200821113210.307175-1-michael.pfeiffer@tu-ilmenau.de> (raw)
Currently, rte_ipv4_cksum() and rte_ipv4_udptcp_cksum() assume all IPv4
headers have sizeof(struct rte_ipv4_hdr) bytes. This is not true for
those (rare) packets with IPv4 options. Thus, both IPv4 and TCP/UDP
checksums are calculated wrong.
This patch fixes the issue by using the actual IPv4 header length from
the packet's IHL field.
Signed-off-by: Michael Pfeiffer <michael.pfeiffer@tu-ilmenau.de>
---
lib/librte_net/rte_ip.h | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index fcd1eb342..6c3ff2603 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -269,7 +269,7 @@ static inline uint16_t
rte_ipv4_cksum(const struct rte_ipv4_hdr *ipv4_hdr)
{
uint16_t cksum;
- cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct rte_ipv4_hdr));
+ cksum = rte_raw_cksum(ipv4_hdr, (ipv4_hdr->version_ihl & 0xf) * 4);
return (uint16_t)~cksum;
}
@@ -311,7 +311,7 @@ rte_ipv4_phdr_cksum(const struct rte_ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
} else {
psd_hdr.len = rte_cpu_to_be_16(
(uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length)
- - sizeof(struct rte_ipv4_hdr)));
+ - ((ipv4_hdr->version_ihl & 0xf) * 4)));
}
return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr));
}
@@ -319,8 +319,8 @@ rte_ipv4_phdr_cksum(const struct rte_ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
/**
* Process the IPv4 UDP or TCP checksum.
*
- * The IPv4 header should not contains options. The IP and layer 4
- * checksum must be set to 0 in the packet by the caller.
+ * The IP and layer 4 checksum must be set to 0 in the packet by
+ * the caller.
*
* @param ipv4_hdr
* The pointer to the contiguous IPv4 header.
@@ -339,7 +339,7 @@ rte_ipv4_udptcp_cksum(const struct rte_ipv4_hdr *ipv4_hdr, const void *l4_hdr)
if (l3_len < sizeof(struct rte_ipv4_hdr))
return 0;
- l4_len = l3_len - sizeof(struct rte_ipv4_hdr);
+ l4_len = l3_len - ((ipv4_hdr->version_ihl & 0xf) * 4);
cksum = rte_raw_cksum(l4_hdr, l4_len);
cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
--
2.28.0
next reply other threads:[~2020-08-21 11:32 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 11:32 Michael Pfeiffer [this message]
2020-08-29 11:43 ` Andrew Rybchenko
2020-09-01 9:47 ` [dpdk-dev] [PATCH v2] " Michael Pfeiffer
2020-09-07 7:48 ` Andrew Rybchenko
2020-10-05 22:55 ` Thomas Monjalon
2020-10-06 2:39 ` Stephen Hemminger
2020-10-06 8:10 ` Olivier Matz
2020-10-06 9:51 ` Michael Pfeiffer
2020-10-06 15:10 ` Thomas Monjalon
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