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authorOle Troan <ot@cisco.com>2019-10-09 13:33:19 +0200
committerNeale Ranns <nranns@cisco.com>2019-11-11 12:33:36 +0000
commiteb284a1f8f10d752285a0a59e75bc54acae50779 (patch)
tree4ce777b223a51fa70f9e0dc18e7842b488b81cd6 /src/plugins/map
parentd318a996b7bdcf0246b2d9927a918a3773a88fa6 (diff)
ip: functional interface to ip fragmentation
This provides a functional interface to IP fragmentation. Allowing external features to fragment. Supports arbitrary encap size, for e.g. MPLS or inner fragmentation of tunnels. This also removed dual loop in MAP that was fundamentally broken. Type: fix Signed-off-by: Ole Troan <ot@cisco.com> Change-Id: Ia89ecec8ee3cbe2416edbe87630fdb714898c2a8 Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/plugins/map')
-rw-r--r--src/plugins/map/ip4_map.c268
-rw-r--r--src/plugins/map/ip4_map_t.c6
-rw-r--r--src/plugins/map/ip6_map.c8
-rw-r--r--src/plugins/map/ip6_map_t.c6
-rw-r--r--src/plugins/map/test/test_map.py74
5 files changed, 148 insertions, 214 deletions
diff --git a/src/plugins/map/ip4_map.c b/src/plugins/map/ip4_map.c
index ad94907e499..f2a00907a57 100644
--- a/src/plugins/map/ip4_map.c
+++ b/src/plugins/map/ip4_map.c
@@ -26,8 +26,6 @@ enum ip4_map_next_e
#ifdef MAP_SKIP_IP6_LOOKUP
IP4_MAP_NEXT_IP6_REWRITE,
#endif
- IP4_MAP_NEXT_IP4_FRAGMENT,
- IP4_MAP_NEXT_IP6_FRAGMENT,
IP4_MAP_NEXT_ICMP_ERROR,
IP4_MAP_NEXT_DROP,
IP4_MAP_N_NEXT,
@@ -117,17 +115,26 @@ ip4_map_decrement_ttl (ip4_header_t * ip, u8 * error)
}
static u32
-ip4_map_fragment (vlib_buffer_t * b, u16 mtu, bool df, u8 * error)
+ip4_map_fragment (vlib_main_t * vm, u32 bi, u16 mtu, bool df, u32 ** buffers,
+ u8 * error)
{
map_main_t *mm = &map_main;
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
if (mm->frag_inner)
{
- // TODO: Fix inner fragmentation after removed inner support from ip-frag.
- ip_frag_set_vnet_buffer (b, /*sizeof (ip6_header_t), */ mtu,
- IP4_FRAG_NEXT_IP6_LOOKUP,
- IP_FRAG_FLAG_IP6_HEADER);
- return (IP4_MAP_NEXT_IP4_FRAGMENT);
+ /* IPv4 fragmented packets inside of IPv6 */
+ ip4_frag_do_fragment (vm, bi, mtu, sizeof (ip6_header_t), buffers);
+
+ /* Fixup */
+ u32 *i;
+ vec_foreach (i, *buffers)
+ {
+ vlib_buffer_t *p = vlib_get_buffer (vm, *i);
+ ip6_header_t *ip6 = vlib_buffer_get_current (p);
+ ip6->payload_length =
+ clib_host_to_net_u16 (p->current_length - sizeof (ip6_header_t));
+ }
}
else
{
@@ -140,10 +147,11 @@ ip4_map_fragment (vlib_buffer_t * b, u16 mtu, bool df, u8 * error)
*error = MAP_ERROR_DF_SET;
return (IP4_MAP_NEXT_ICMP_ERROR);
}
- ip_frag_set_vnet_buffer (b, mtu, IP6_FRAG_NEXT_IP6_LOOKUP,
- IP_FRAG_FLAG_IP6_HEADER);
- return (IP4_MAP_NEXT_IP6_FRAGMENT);
+
+ /* Create IPv6 fragments here */
+ ip6_frag_do_fragment (vm, bi, mtu, 0, buffers);
}
+ return (IP4_MAP_NEXT_IP6_LOOKUP);
}
/*
@@ -165,189 +173,6 @@ ip4_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
- /* Dual loop */
- while (n_left_from >= 4 && n_left_to_next >= 2)
- {
- u32 pi0, pi1;
- vlib_buffer_t *p0, *p1;
- map_domain_t *d0, *d1;
- u8 error0 = MAP_ERROR_NONE, error1 = MAP_ERROR_NONE;
- ip4_header_t *ip40, *ip41;
- u16 port0 = 0, port1 = 0;
- ip6_header_t *ip6h0, *ip6h1;
- u32 map_domain_index0 = ~0, map_domain_index1 = ~0;
- u32 next0 = IP4_MAP_NEXT_IP6_LOOKUP, next1 =
- IP4_MAP_NEXT_IP6_LOOKUP;
-
- /* Prefetch next iteration. */
- {
- vlib_buffer_t *p2, *p3;
-
- p2 = vlib_get_buffer (vm, from[2]);
- p3 = vlib_get_buffer (vm, from[3]);
-
- vlib_prefetch_buffer_header (p2, STORE);
- vlib_prefetch_buffer_header (p3, STORE);
- /* IPv4 + 8 = 28. possibly plus -40 */
- CLIB_PREFETCH (p2->data - 40, 68, STORE);
- CLIB_PREFETCH (p3->data - 40, 68, STORE);
- }
-
- pi0 = to_next[0] = from[0];
- pi1 = to_next[1] = from[1];
- from += 2;
- n_left_from -= 2;
- to_next += 2;
- n_left_to_next -= 2;
-
- p0 = vlib_get_buffer (vm, pi0);
- p1 = vlib_get_buffer (vm, pi1);
- ip40 = vlib_buffer_get_current (p0);
- ip41 = vlib_buffer_get_current (p1);
- d0 =
- ip4_map_get_domain (&ip40->dst_address, &map_domain_index0,
- &error0);
- d1 =
- ip4_map_get_domain (&ip41->dst_address, &map_domain_index1,
- &error1);
-
- /*
- * Shared IPv4 address
- */
- port0 = ip4_map_port_and_security_check (d0, p0, &error0);
- port1 = ip4_map_port_and_security_check (d1, p1, &error1);
-
- /* Decrement IPv4 TTL */
- ip4_map_decrement_ttl (ip40, &error0);
- ip4_map_decrement_ttl (ip41, &error1);
- bool df0 =
- ip40->flags_and_fragment_offset &
- clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
- bool df1 =
- ip41->flags_and_fragment_offset &
- clib_host_to_net_u16 (IP4_HEADER_FLAG_DONT_FRAGMENT);
-
- /* MAP calc */
- u32 da40 = clib_net_to_host_u32 (ip40->dst_address.as_u32);
- u32 da41 = clib_net_to_host_u32 (ip41->dst_address.as_u32);
- u16 dp40 = clib_net_to_host_u16 (port0);
- u16 dp41 = clib_net_to_host_u16 (port1);
- u64 dal60 = map_get_pfx (d0, da40, dp40);
- u64 dal61 = map_get_pfx (d1, da41, dp41);
- u64 dar60 = map_get_sfx (d0, da40, dp40);
- u64 dar61 = map_get_sfx (d1, da41, dp41);
- if (dal60 == 0 && dar60 == 0 && error0 == MAP_ERROR_NONE)
- error0 = MAP_ERROR_NO_BINDING;
- if (dal61 == 0 && dar61 == 0 && error1 == MAP_ERROR_NONE)
- error1 = MAP_ERROR_NO_BINDING;
-
- /* construct ipv6 header */
- vlib_buffer_advance (p0, -sizeof (ip6_header_t));
- vlib_buffer_advance (p1, -sizeof (ip6_header_t));
- ip6h0 = vlib_buffer_get_current (p0);
- ip6h1 = vlib_buffer_get_current (p1);
- vnet_buffer (p0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
- vnet_buffer (p1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
-
- ip6h0->ip_version_traffic_class_and_flow_label =
- ip4_map_vtcfl (ip40, p0);
- ip6h1->ip_version_traffic_class_and_flow_label =
- ip4_map_vtcfl (ip41, p1);
- ip6h0->payload_length = ip40->length;
- ip6h1->payload_length = ip41->length;
- ip6h0->protocol = IP_PROTOCOL_IP_IN_IP;
- ip6h1->protocol = IP_PROTOCOL_IP_IN_IP;
- ip6h0->hop_limit = 0x40;
- ip6h1->hop_limit = 0x40;
- ip6h0->src_address = d0->ip6_src;
- ip6h1->src_address = d1->ip6_src;
- ip6h0->dst_address.as_u64[0] = clib_host_to_net_u64 (dal60);
- ip6h0->dst_address.as_u64[1] = clib_host_to_net_u64 (dar60);
- ip6h1->dst_address.as_u64[0] = clib_host_to_net_u64 (dal61);
- ip6h1->dst_address.as_u64[1] = clib_host_to_net_u64 (dar61);
-
- /*
- * Determine next node. Can be one of:
- * ip6-lookup, ip6-rewrite, ip4-fragment, error-drop
- */
- if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
- {
- if (PREDICT_FALSE
- (d0->mtu
- && (clib_net_to_host_u16 (ip6h0->payload_length) +
- sizeof (*ip6h0) > d0->mtu)))
- {
- next0 = ip4_map_fragment (p0, d0->mtu, df0, &error0);
- }
- else
- {
- next0 =
- ip4_map_ip6_lookup_bypass (p0,
- ip40) ?
- IP4_MAP_NEXT_IP6_REWRITE : next0;
- vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
- thread_index,
- map_domain_index0, 1,
- clib_net_to_host_u16
- (ip6h0->payload_length) +
- 40);
- }
- }
- else
- {
- next0 = IP4_MAP_NEXT_DROP;
- }
-
- /*
- * Determine next node. Can be one of:
- * ip6-lookup, ip6-rewrite, ip4-fragment, error-drop
- */
- if (PREDICT_TRUE (error1 == MAP_ERROR_NONE))
- {
- if (PREDICT_FALSE
- (d1->mtu
- && (clib_net_to_host_u16 (ip6h1->payload_length) +
- sizeof (*ip6h1) > d1->mtu)))
- {
- next1 = ip4_map_fragment (p1, d1->mtu, df1, &error1);
- }
- else
- {
- next1 =
- ip4_map_ip6_lookup_bypass (p1,
- ip41) ?
- IP4_MAP_NEXT_IP6_REWRITE : next1;
- vlib_increment_combined_counter (cm + MAP_DOMAIN_COUNTER_TX,
- thread_index,
- map_domain_index1, 1,
- clib_net_to_host_u16
- (ip6h1->payload_length) +
- 40);
- }
- }
- else
- {
- next1 = IP4_MAP_NEXT_DROP;
- }
-
- if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
- {
- map_add_trace (vm, node, p0, map_domain_index0, port0);
- }
- if (PREDICT_FALSE (p1->flags & VLIB_BUFFER_IS_TRACED))
- {
- map_add_trace (vm, node, p1, map_domain_index1, port0);
- }
-
- p0->error = error_node->errors[error0];
- p1->error = error_node->errors[error1];
-
- vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
- n_left_to_next, pi0, pi1, next0,
- next1);
- }
-
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 pi0;
@@ -359,12 +184,13 @@ ip4_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
ip6_header_t *ip6h0;
u32 next0 = IP4_MAP_NEXT_IP6_LOOKUP;
u32 map_domain_index0 = ~0;
+ u32 *buffer0 = 0;
+ bool free_original_buffer0 = false;
+ u32 *frag_from0, frag_left0;
pi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
- to_next += 1;
- n_left_to_next -= 1;
p0 = vlib_get_buffer (vm, pi0);
ip40 = vlib_buffer_get_current (p0);
@@ -413,7 +239,7 @@ ip4_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
/*
* Determine next node. Can be one of:
- * ip6-lookup, ip6-rewrite, ip4-fragment, error-drop
+ * ip6-lookup, ip6-rewrite, error-drop
*/
if (PREDICT_TRUE (error0 == MAP_ERROR_NONE))
{
@@ -422,7 +248,14 @@ ip4_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
&& (clib_net_to_host_u16 (ip6h0->payload_length) +
sizeof (*ip6h0) > d0->mtu)))
{
- next0 = ip4_map_fragment (p0, d0->mtu, df0, &error0);
+ next0 =
+ ip4_map_fragment (vm, pi0, d0->mtu, df0, &buffer0,
+ &error0);
+
+ if (error0 == MAP_ERROR_NONE)
+ {
+ free_original_buffer0 = true;
+ }
}
else
{
@@ -450,8 +283,41 @@ ip4_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
p0->error = error_node->errors[error0];
exit:
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, pi0, next0);
+ /* Send fragments that were added in the frame */
+ if (free_original_buffer0)
+ {
+ vlib_buffer_free_one (vm, pi0); /* Free original packet */
+ }
+ else
+ {
+ vec_add1 (buffer0, pi0);
+ }
+
+ frag_from0 = buffer0;
+ frag_left0 = vec_len (buffer0);
+
+ while (frag_left0 > 0)
+ {
+ while (frag_left0 > 0 && n_left_to_next > 0)
+ {
+ u32 i0;
+ i0 = to_next[0] = frag_from0[0];
+ frag_from0 += 1;
+ frag_left0 -= 1;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ vlib_get_buffer (vm, i0)->error =
+ error_node->errors[error0];
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ i0, next0);
+ }
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ vlib_get_next_frame (vm, node, next_index, to_next,
+ n_left_to_next);
+ }
+ vec_reset_length (buffer0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
@@ -491,8 +357,6 @@ VLIB_REGISTER_NODE(ip4_map_node) = {
#ifdef MAP_SKIP_IP6_LOOKUP
[IP4_MAP_NEXT_IP6_REWRITE] = "ip6-load-balance",
#endif
- [IP4_MAP_NEXT_IP4_FRAGMENT] = "ip4-frag",
- [IP4_MAP_NEXT_IP6_FRAGMENT] = "ip6-frag",
[IP4_MAP_NEXT_ICMP_ERROR] = "ip4-icmp-error",
[IP4_MAP_NEXT_DROP] = "error-drop",
},
diff --git a/src/plugins/map/ip4_map_t.c b/src/plugins/map/ip4_map_t.c
index 621fb0615dc..c254efc78b9 100644
--- a/src/plugins/map/ip4_map_t.c
+++ b/src/plugins/map/ip4_map_t.c
@@ -168,7 +168,7 @@ ip4_map_t_icmp (vlib_main_t * vm,
if (vnet_buffer (p0)->map_t.mtu < p0->current_length)
{
vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
- vnet_buffer (p0)->ip_frag.next_index = IP6_FRAG_NEXT_IP6_LOOKUP;
+ vnet_buffer (p0)->ip_frag.next_index = IP_FRAG_NEXT_IP6_LOOKUP;
next0 = IP4_MAPT_ICMP_NEXT_IP6_FRAG;
}
err0:
@@ -287,7 +287,7 @@ ip4_map_t_fragmented (vlib_main_t * vm,
{
vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
vnet_buffer (p0)->ip_frag.next_index =
- IP6_FRAG_NEXT_IP6_LOOKUP;
+ IP_FRAG_NEXT_IP6_LOOKUP;
next0 = IP4_MAPT_FRAGMENTED_NEXT_IP6_FRAG;
}
}
@@ -453,7 +453,7 @@ ip4_map_t_tcp_udp (vlib_main_t * vm,
//Send to fragmentation node if necessary
vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
vnet_buffer (p0)->ip_frag.next_index =
- IP6_FRAG_NEXT_IP6_LOOKUP;
+ IP_FRAG_NEXT_IP6_LOOKUP;
next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG;
}
}
diff --git a/src/plugins/map/ip6_map.c b/src/plugins/map/ip6_map.c
index 96f81efc1cb..47958f92a38 100644
--- a/src/plugins/map/ip6_map.c
+++ b/src/plugins/map/ip6_map.c
@@ -314,7 +314,7 @@ ip6_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
vnet_buffer (p0)->ip_frag.flags = 0;
vnet_buffer (p0)->ip_frag.next_index =
- IP4_FRAG_NEXT_IP4_LOOKUP;
+ IP_FRAG_NEXT_IP4_LOOKUP;
vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
next0 = IP6_MAP_NEXT_IP4_FRAGMENT;
}
@@ -346,7 +346,7 @@ ip6_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
vnet_buffer (p1)->ip_frag.flags = 0;
vnet_buffer (p1)->ip_frag.next_index =
- IP4_FRAG_NEXT_IP4_LOOKUP;
+ IP_FRAG_NEXT_IP4_LOOKUP;
vnet_buffer (p1)->ip_frag.mtu = d1->mtu;
next1 = IP6_MAP_NEXT_IP4_FRAGMENT;
}
@@ -497,7 +497,7 @@ ip6_map (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame)
{
vnet_buffer (p0)->ip_frag.flags = 0;
vnet_buffer (p0)->ip_frag.next_index =
- IP4_FRAG_NEXT_IP4_LOOKUP;
+ IP_FRAG_NEXT_IP4_LOOKUP;
vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
next0 = IP6_MAP_NEXT_IP4_FRAGMENT;
}
@@ -622,7 +622,7 @@ ip6_map_post_ip4_reass (vlib_main_t * vm,
&& error0 == MAP_ERROR_NONE))
{
vnet_buffer (p0)->ip_frag.flags = 0;
- vnet_buffer (p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP4_LOOKUP;
+ vnet_buffer (p0)->ip_frag.next_index = IP_FRAG_NEXT_IP4_LOOKUP;
vnet_buffer (p0)->ip_frag.mtu = d0->mtu;
next0 = IP6_MAP_POST_IP4_REASS_NEXT_IP4_FRAGMENT;
}
diff --git a/src/plugins/map/ip6_map_t.c b/src/plugins/map/ip6_map_t.c
index 6e9c0d7640c..ef7b91349e5 100644
--- a/src/plugins/map/ip6_map_t.c
+++ b/src/plugins/map/ip6_map_t.c
@@ -169,7 +169,7 @@ ip6_map_t_icmp (vlib_main_t * vm,
{
// Send to fragmentation node if necessary
vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
- vnet_buffer (p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP4_LOOKUP;
+ vnet_buffer (p0)->ip_frag.next_index = IP_FRAG_NEXT_IP4_LOOKUP;
next0 = IP6_MAPT_ICMP_NEXT_IP4_FRAG;
}
err0:
@@ -288,7 +288,7 @@ ip6_map_t_fragmented (vlib_main_t * vm,
// Send to fragmentation node if necessary
vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
vnet_buffer (p0)->ip_frag.next_index =
- IP4_FRAG_NEXT_IP4_LOOKUP;
+ IP_FRAG_NEXT_IP4_LOOKUP;
next0 = IP6_MAPT_FRAGMENTED_NEXT_IP4_FRAG;
}
}
@@ -441,7 +441,7 @@ ip6_map_t_tcp_udp (vlib_main_t * vm,
// Send to fragmentation node if necessary
vnet_buffer (p0)->ip_frag.mtu = vnet_buffer (p0)->map_t.mtu;
vnet_buffer (p0)->ip_frag.next_index =
- IP4_FRAG_NEXT_IP4_LOOKUP;
+ IP_FRAG_NEXT_IP4_LOOKUP;
next0 = IP6_MAPT_TCP_UDP_NEXT_IP4_FRAG;
}
}
diff --git a/src/plugins/map/test/test_map.py b/src/plugins/map/test/test_map.py
index a7e5f165576..c1fe05e1150 100644
--- a/src/plugins/map/test/test_map.py
+++ b/src/plugins/map/test/test_map.py
@@ -140,7 +140,7 @@ class TestMAP(VppTestCase):
IP(src=self.pg0.remote_ip4, dst=self.pg0.remote_ip4) /
UDP(sport=20000, dport=10000) /
Raw(b'\xa5' * 100))
- rx = self.send_and_expect(self.pg0, v4*1, self.pg0)
+ rx = self.send_and_expect(self.pg0, v4 * 4, self.pg0)
v4_reply = v4[1]
v4_reply.ttl -= 1
for p in rx:
@@ -154,7 +154,7 @@ class TestMAP(VppTestCase):
UDP(sport=20000, dport=10000) /
Raw(b'\xa5' * 100))
- self.send_and_assert_encapped_one(v4, "3000::1", map_translated_addr)
+ self.send_and_assert_encapped(v4 * 4, "3000::1", map_translated_addr)
#
# Verify reordered fragments are able to pass as well
@@ -294,6 +294,76 @@ class TestMAP(VppTestCase):
pre_res_route.remove_vpp_config()
self.vapi.ppcli("map params pre-resolve del ip6-nh 4001::1")
+ def test_map_e_inner_frag(self):
+ """ MAP-E Inner fragmentation """
+
+ #
+ # Add a route to the MAP-BR
+ #
+ map_br_pfx = "2001::"
+ map_br_pfx_len = 32
+ map_route = VppIpRoute(self,
+ map_br_pfx,
+ map_br_pfx_len,
+ [VppRoutePath(self.pg1.remote_ip6,
+ self.pg1.sw_if_index)])
+ map_route.add_vpp_config()
+
+ #
+ # Add a domain that maps from pg0 to pg1
+ #
+ map_dst = '2001::/32'
+ map_src = '3000::1/128'
+ client_pfx = '192.168.0.0/16'
+ map_translated_addr = '2001:0:101:7000:0:c0a8:101:7'
+ tag = 'MAP-E tag.'
+ self.vapi.map_add_domain(ip4_prefix=client_pfx,
+ ip6_prefix=map_dst,
+ ip6_src=map_src,
+ ea_bits_len=20,
+ psid_offset=4,
+ psid_length=4,
+ mtu=1000,
+ tag=tag)
+
+ # Enable MAP on interface.
+ self.vapi.map_if_enable_disable(is_enable=1,
+ sw_if_index=self.pg0.sw_if_index,
+ is_translation=0)
+
+ # Enable inner fragmentation
+ self.vapi.map_param_set_fragmentation(inner=1)
+
+ v4 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+ IP(src=self.pg0.remote_ip4, dst='192.168.1.1') /
+ UDP(sport=20000, dport=10000) /
+ Raw(b'\xa5' * 1300))
+
+ self.pg_send(self.pg0, v4*1)
+ rx = self.pg1.get_capture(2)
+
+ frags = fragment_rfc791(v4[1], 1000)
+ frags[0].id = 0
+ frags[1].id = 0
+ frags[0].ttl -= 1
+ frags[1].ttl -= 1
+ frags[0].chksum = 0
+ frags[1].chksum = 0
+
+ v6_reply1 = (IPv6(src='3000::1', dst=map_translated_addr, hlim=63) /
+ frags[0])
+ v6_reply2 = (IPv6(src='3000::1', dst=map_translated_addr, hlim=63) /
+ frags[1])
+ rx[0][1].fl = 0
+ rx[1][1].fl = 0
+ rx[0][1][IP].id = 0
+ rx[1][1][IP].id = 0
+ rx[0][1][IP].chksum = 0
+ rx[1][1][IP].chksum = 0
+
+ self.validate(rx[0][1], v6_reply1)
+ self.validate(rx[1][1], v6_reply2)
+
def validate(self, rx, expected):
self.assertEqual(rx, expected.__class__(scapy.compat.raw(expected)))