ip: translate fragmented icmp to fragmented icmp6
The first translated ICMPv6 packet of a fragmented ICMP message does
not have a IPv6 fragment header. All subsequent have.
With this commit, add a IPv6 fragment header to the first translated
ICMPv6 packet.
Type: fix
Change-Id: Id89409ce7273cbeed801e2e18a09d3e7c3c4e4bc
Signed-off-by: Alexander Chernavin <achernavin@netgate.com>
diff --git a/src/vnet/ip/ip4_to_ip6.h b/src/vnet/ip/ip4_to_ip6.h
index e78985b..a6d87f1 100644
--- a/src/vnet/ip/ip4_to_ip6.h
+++ b/src/vnet/ip/ip4_to_ip6.h
@@ -226,8 +226,10 @@
icmp46_header_t *icmp;
ip_csum_t csum;
ip6_frag_hdr_t *inner_frag;
+ ip6_frag_hdr_t *outer_frag= NULL;
u32 inner_frag_id;
u32 inner_frag_offset;
+ u32 outer_frag_id;
u8 inner_frag_more;
u16 *inner_L4_checksum = 0;
int rv;
@@ -397,8 +399,20 @@
}
else
{
- vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6));
- ip6 = vlib_buffer_get_current (p);
+ if (PREDICT_FALSE (ip4->flags_and_fragment_offset &
+ clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS)))
+ {
+ vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6) -
+ sizeof (*outer_frag));
+ ip6 = vlib_buffer_get_current (p);
+ outer_frag = (ip6_frag_hdr_t *) (ip6 + 1);
+ outer_frag_id = frag_id_4to6 (ip4->fragment_id);
+ }
+ else
+ {
+ vlib_buffer_advance (p, sizeof (*ip4) - sizeof (*ip6));
+ ip6 = vlib_buffer_get_current (p);
+ }
ip6->payload_length =
clib_host_to_net_u16 (clib_net_to_host_u16 (ip4->length) -
sizeof (*ip4));
@@ -414,6 +428,17 @@
if ((rv = fn (p, ip4, ip6, ctx)) != 0)
return rv;
+ if (PREDICT_FALSE (outer_frag != NULL))
+ {
+ outer_frag->next_hdr = ip6->protocol;
+ outer_frag->identification = outer_frag_id;
+ outer_frag->rsv = 0;
+ outer_frag->fragment_offset_and_more = ip6_frag_hdr_offset_and_more (0, 1);
+ ip6->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION;
+ ip6->payload_length = u16_net_add (ip6->payload_length,
+ sizeof (*outer_frag));
+ }
+
//Truncate when ICMPv6 error message exceeds the minimal IPv6 MTU
if (p->current_length > 1280 && icmp->type < 128)
{