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authorBenoît Ganne <bganne@cisco.com>2020-08-31 18:59:34 +0200
committerDamjan Marion <dmarion@me.com>2020-09-01 12:03:27 +0000
commit6e334e3e77bb156a9317a37500077a218a04f7a3 (patch)
treefa2caf364ba7d99ca7e3895c37bb1047c6be8c0f /src/vnet/ipfix-export
parent1d104c5ecdce37301fdfea0e62a533a2e5342ee0 (diff)
ip: fix ip zero checksum verification
In one's complement, there are two representations of zero: the all zero and the all one bit values, often referred to as +0 and -0. See RFC 1624 section 3 for more details. This used to be taken care of in ip4_header_checksum(), but it is no longer the case. The check ip->checksum == ip4_header_checksum (ip) is no longer correct in the -0 case. Always use ip4_header_checksum_is_valid() instead (which behaves correctly since 9a79a1ab931c3b5a7ae07d6f0fcfef7c4368a2c4). Type: fix Fixes: e5f0050c7a5d411f96af6401797529d58825e2af Change-Id: Iacc6b60645a834287b085aecb9e3fdb4554cf0cf Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src/vnet/ipfix-export')
-rw-r--r--src/vnet/ipfix-export/flow_report_classify.c4
-rw-r--r--src/vnet/ipfix-export/ipfix_doc.md2
2 files changed, 3 insertions, 3 deletions
diff --git a/src/vnet/ipfix-export/flow_report_classify.c b/src/vnet/ipfix-export/flow_report_classify.c
index f004e9a0806..58f623db145 100644
--- a/src/vnet/ipfix-export/flow_report_classify.c
+++ b/src/vnet/ipfix-export/flow_report_classify.c
@@ -321,7 +321,7 @@ ipfix_classify_send_flows (flow_report_main_t * frm,
udp->checksum = 0xffff;
}
- ASSERT (ip->checksum == ip4_header_checksum (ip));
+ ASSERT (ip4_header_checksum_is_valid (ip));
to_next[0] = bi0;
f->n_vectors++;
@@ -376,7 +376,7 @@ flush:
udp->checksum = 0xffff;
}
- ASSERT (ip->checksum == ip4_header_checksum (ip));
+ ASSERT (ip4_header_checksum_is_valid (ip));
to_next[0] = bi0;
f->n_vectors++;
diff --git a/src/vnet/ipfix-export/ipfix_doc.md b/src/vnet/ipfix-export/ipfix_doc.md
index 59118f68e11..1c7aad7750d 100644
--- a/src/vnet/ipfix-export/ipfix_doc.md
+++ b/src/vnet/ipfix-export/ipfix_doc.md
@@ -259,7 +259,7 @@ This function creates the packet header for an ipfix data packet
udp->checksum = 0xffff;
}
- ASSERT (ip->checksum == ip4_header_checksum (ip));
+ ASSERT (ip4_header_checksum_is_valid (ip));
vlib_put_frame_to_node (vm, ip4_lookup_node.index, f);
}