While fixing the issue with getting of IPv4 address from device,
the setting of default src IPv4/IPv6 addresses was moved from
hdr->header_init(...) callback to hdr->packet_finish(...), but
packet_finish(...) is called in the following order:

    udp_hdr->packet_finish() - UDP csum calculation over IPv4/6 pseudo header
    ip4_hdr->packet_finish() - setting default src IPv4 address from dev

So src IPv4/6 address will be set after UDP/TCP csum calculation which
is wrong, so fixed issue by moving it to the hdr->header_init(...) stage
as it was before the c4e07d5142c8.

Fixes: c4e07d5142c8 ("trafgen: l3: Support interface without IP address")
Signed-off-by: Vadim Kochan <vadi...@gmail.com>
 trafgen_l3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/trafgen_l3.c b/trafgen_l3.c
index 4d67f58..70aefb9 100644
--- a/trafgen_l3.c
+++ b/trafgen_l3.c
@@ -40,6 +40,7 @@ static void ipv4_header_init(struct proto_hdr *hdr)
        proto_hdr_field_set_default_u8(hdr, IP4_VER, 4);
        proto_hdr_field_set_default_u8(hdr, IP4_IHL, 5);
+       proto_hdr_field_set_default_dev_ipv4(hdr, IP4_SADDR);
 static void ipv4_field_changed(struct proto_field *field)
@@ -80,7 +81,6 @@ static void ipv4_packet_finish(struct proto_hdr *hdr)
        total_len = pkt->len - hdr->pkt_offset;
        proto_hdr_field_set_default_be16(hdr, IP4_LEN, total_len);
-       proto_hdr_field_set_default_dev_ipv4(hdr, IP4_SADDR);
@@ -140,6 +140,7 @@ static void ipv6_header_init(struct proto_hdr *hdr)
        proto_header_fields_add(hdr, ipv6_fields, array_size(ipv6_fields));
        proto_hdr_field_set_default_be32(hdr, IP6_VER, 6);
+       proto_hdr_field_set_default_dev_ipv6(hdr, IP6_SADDR);
 static void ipv6_field_changed(struct proto_field *field)
@@ -160,7 +161,6 @@ static void ipv6_packet_finish(struct proto_hdr *hdr)
        uint16_t total_len = pkt->len - hdr->pkt_offset - IPV6_HDR_LEN;
        proto_hdr_field_set_default_be16(hdr, IP6_LEN, total_len);
-       proto_hdr_field_set_default_dev_ipv6(hdr, IP6_SADDR);
 static void ipv6_set_next_proto(struct proto_hdr *hdr, enum proto_id pid)

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