Update csum if any of ICMPv4 field was chaned.
Signed-off-by: Vadim Kochan <vadi...@gmail.com>
---
trafgen_l4.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/trafgen_l4.c b/trafgen_l4.c
index 79c5914..19ebb37 100644
--- a/trafgen_l4.c
+++ b/trafgen_l4.c
@@ -156,25 +156,37 @@ static void icmpv4_header_init(struct proto_hdr *hdr)
proto_header_fields_add(hdr, icmpv4_fields, array_size(icmpv4_fields));
}
-static void icmpv4_packet_finish(struct proto_hdr *hdr)
+static void icmpv4_csum_update(struct proto_hdr *hdr)
{
struct packet *pkt;
uint16_t csum;
+ if (hdr->is_csum_valid)
+ return;
if (proto_field_is_set(hdr, ICMPV4_CSUM))
return;
- pkt = current_packet();
+ pkt = packet_get(hdr->pkt_id);
+ proto_field_set_default_u16(hdr, ICMPV4_CSUM, 0);
csum = htons(calc_csum(proto_header_ptr(hdr), pkt->len -
hdr->pkt_offset));
- proto_field_set_u16(hdr, ICMPV4_CSUM, bswap_16(csum));
+ proto_field_set_default_u16(hdr, ICMPV4_CSUM, bswap_16(csum));
+
+ hdr->is_csum_valid = true;
+}
+
+static void icmpv4_field_changed(struct proto_hdr *hdr, struct proto_field
*field)
+{
+ hdr->is_csum_valid = false;
}
static struct proto_hdr icmpv4_hdr = {
.id = PROTO_ICMP4,
.layer = PROTO_L4,
.header_init = icmpv4_header_init,
- .packet_finish = icmpv4_packet_finish,
+ .packet_update = icmpv4_csum_update,
+ .packet_finish = icmpv4_csum_update,
+ .field_changed = icmpv4_field_changed,
};
static struct proto_field icmpv6_fields[] = {
--
2.9.2
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