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authorNeale Ranns <nranns@cisco.com>2020-12-21 09:52:24 +0000
committerNeale Ranns <neale@graphiant.com>2021-01-07 15:48:43 +0000
commite294de6f876587ddc34ab02771771aea60087adc (patch)
treea68640401fac25d1d137dd119dbb6a03c7938173 /src/vnet/ipip/ipip.c
parenta9e2774f5561ccb77c8243a196f93f5070f6c5ad (diff)
ipip: Support MPLS over IP
Type: feature Signed-off-by: Neale Ranns <neale@graphiant.com> Change-Id: Ief1755131297afcaa14fe74fd8dd28c71a92fbe6
Diffstat (limited to 'src/vnet/ipip/ipip.c')
-rw-r--r--src/vnet/ipip/ipip.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/vnet/ipip/ipip.c b/src/vnet/ipip/ipip.c
index 357eb58f160..ca52142f5c6 100644
--- a/src/vnet/ipip/ipip.c
+++ b/src/vnet/ipip/ipip.c
@@ -93,6 +93,9 @@ ipip_build_rewrite (vnet_main_t * vnm, u32 sw_if_index,
case VNET_LINK_IP4:
ip4->protocol = IP_PROTOCOL_IP_IN_IP;
break;
+ case VNET_LINK_MPLS:
+ ip4->protocol = IP_PROTOCOL_MPLS_IN_IP;
+ break;
default:
break;
}
@@ -121,6 +124,9 @@ ipip_build_rewrite (vnet_main_t * vnm, u32 sw_if_index,
case VNET_LINK_IP4:
ip6->protocol = IP_PROTOCOL_IP_IN_IP;
break;
+ case VNET_LINK_MPLS:
+ ip6->protocol = IP_PROTOCOL_MPLS_IN_IP;
+ break;
default:
break;
}
@@ -202,6 +208,46 @@ ipip66_fixup (vlib_main_t * vm,
}
static void
+ipipm6_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b,
+ const void *data)
+{
+ tunnel_encap_decap_flags_t flags;
+ ip6_header_t *ip6;
+
+ flags = pointer_to_uword (data);
+
+ /* Must set locally originated otherwise we're not allowed to
+ fragment the packet later and we'll get an unwanted hop-limt
+ decrement */
+ b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
+ ip6 = vlib_buffer_get_current (b);
+ ip6->payload_length =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b) - sizeof (*ip6));
+ tunnel_encap_fixup_mplso6 (flags, (mpls_unicast_header_t *) (ip6 + 1), ip6);
+}
+
+static void
+ipipm4_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b,
+ const void *data)
+{
+ tunnel_encap_decap_flags_t flags;
+ ip4_header_t *ip4;
+
+ flags = pointer_to_uword (data);
+
+ /* Must set locally originated otherwise we'll do a TTL decrement
+ * during ip4-rewrite */
+ b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
+ ip4 = vlib_buffer_get_current (b);
+ ip4->length =
+ clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b) - sizeof (*ip4));
+ tunnel_encap_fixup_mplso4 (flags, (mpls_unicast_header_t *) (ip4 + 1), ip4);
+ ip4->checksum = ip4_header_checksum (ip4);
+}
+
+static void
ipip_tunnel_stack (adj_index_t ai)
{
ip_adjacency_t *adj;
@@ -265,8 +311,12 @@ ipip_get_fixup (const ipip_tunnel_t * t, vnet_link_t lt, adj_flags_t * aflags)
return (ipip66_fixup);
if (t->transport == IPIP_TRANSPORT_IP6 && lt == VNET_LINK_IP4)
return (ipip46_fixup);
+ if (t->transport == IPIP_TRANSPORT_IP6 && lt == VNET_LINK_MPLS)
+ return (ipipm6_fixup);
if (t->transport == IPIP_TRANSPORT_IP4 && lt == VNET_LINK_IP6)
return (ipip64_fixup);
+ if (t->transport == IPIP_TRANSPORT_IP4 && lt == VNET_LINK_MPLS)
+ return (ipipm4_fixup);
if (t->transport == IPIP_TRANSPORT_IP4 && lt == VNET_LINK_IP4)
{
*aflags = *aflags | ADJ_FLAG_MIDCHAIN_FIXUP_IP4O4_HDR;
@@ -756,12 +806,14 @@ ipip_add_tunnel (ipip_transport_t transport,
if (t->transport == IPIP_TRANSPORT_IP6 && !gm->ip6_protocol_registered)
{
ip6_register_protocol (IP_PROTOCOL_IP_IN_IP, ipip6_input_node.index);
+ ip6_register_protocol (IP_PROTOCOL_MPLS_IN_IP, ipip6_input_node.index);
ip6_register_protocol (IP_PROTOCOL_IPV6, ipip6_input_node.index);
gm->ip6_protocol_registered = true;
}
else if (t->transport == IPIP_TRANSPORT_IP4 && !gm->ip4_protocol_registered)
{
ip4_register_protocol (IP_PROTOCOL_IP_IN_IP, ipip4_input_node.index);
+ ip4_register_protocol (IP_PROTOCOL_MPLS_IN_IP, ipip4_input_node.index);
ip4_register_protocol (IP_PROTOCOL_IPV6, ipip4_input_node.index);
gm->ip4_protocol_registered = true;
}