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authorPablo Camarillo <pcamaril@cisco.com>2018-01-08 14:25:55 +0100
committerDave Wallace <dwallacelf@gmail.com>2018-01-09 21:40:15 +0000
commitd327c87d91aebdb4edcc0c5fed91326a746de43b (patch)
tree42b63067f5d3171632e40b4f4bcf1a6debbd5842
parent2e172eab36d8b3d53e5c88e29ca81d7d7ecd9620 (diff)
VPP-1120 SRv6 bug with SID list containing only one SID and no srh
Packets with a SR policy of one SID list create a malformed packet. Outer IPv6 header points to a routing extension header that does not exist since the SID list contains only one SID. Change-Id: I1effee0457453bab95706a8a24fdabfbd843d5b7 Signed-off-by: Pablo Camarillo <pcamaril@cisco.com>
-rwxr-xr-xsrc/vnet/srv6/sr_policy_rewrite.c90
1 files changed, 64 insertions, 26 deletions
diff --git a/src/vnet/srv6/sr_policy_rewrite.c b/src/vnet/srv6/sr_policy_rewrite.c
index b42942c3cd5..ad73d29d518 100755
--- a/src/vnet/srv6/sr_policy_rewrite.c
+++ b/src/vnet/srv6/sr_policy_rewrite.c
@@ -177,22 +177,26 @@ compute_rewrite_encaps (ip6_address_t * sl)
iph->protocol = IP_PROTOCOL_IPV6;
iph->hop_limit = IPv6_DEFAULT_HOP_LIMIT;
- srh = (ip6_sr_header_t *) (iph + 1);
- iph->protocol = IP_PROTOCOL_IPV6_ROUTE;
- srh->protocol = IP_PROTOCOL_IPV6;
- srh->type = ROUTING_HEADER_TYPE_SR;
- srh->segments_left = vec_len (sl) - 1;
- srh->first_segment = vec_len (sl) - 1;
- srh->length = ((sizeof (ip6_sr_header_t) +
- (vec_len (sl) * sizeof (ip6_address_t))) / 8) - 1;
- srh->flags = 0x00;
- srh->reserved = 0x00;
- addrp = srh->segments + vec_len (sl) - 1;
- vec_foreach (this_address, sl)
- {
- clib_memcpy (addrp->as_u8, this_address->as_u8, sizeof (ip6_address_t));
- addrp--;
- }
+ if (vec_len (sl) > 1)
+ {
+ srh = (ip6_sr_header_t *) (iph + 1);
+ iph->protocol = IP_PROTOCOL_IPV6_ROUTE;
+ srh->protocol = IP_PROTOCOL_IPV6;
+ srh->type = ROUTING_HEADER_TYPE_SR;
+ srh->segments_left = vec_len (sl) - 1;
+ srh->first_segment = vec_len (sl) - 1;
+ srh->length = ((sizeof (ip6_sr_header_t) +
+ (vec_len (sl) * sizeof (ip6_address_t))) / 8) - 1;
+ srh->flags = 0x00;
+ srh->reserved = 0x00;
+ addrp = srh->segments + vec_len (sl) - 1;
+ vec_foreach (this_address, sl)
+ {
+ clib_memcpy (addrp->as_u8, this_address->as_u8,
+ sizeof (ip6_address_t));
+ addrp--;
+ }
+ }
iph->dst_address.as_u64[0] = sl->as_u64[0];
iph->dst_address.as_u64[1] = sl->as_u64[1];
return rs;
@@ -1332,8 +1336,13 @@ encaps_processing_v4 (vlib_node_runtime_t * node,
ip0->ip_version_traffic_class_and_flow_label =
clib_host_to_net_u32 (0 | ((6 & 0xF) << 28) |
((ip0_encap->tos & 0xFF) << 20));
- sr0 = (void *) (ip0 + 1);
- sr0->protocol = IP_PROTOCOL_IP_IN_IP;
+ if (ip0->protocol == IP_PROTOCOL_IPV6_ROUTE)
+ {
+ sr0 = (void *) (ip0 + 1);
+ sr0->protocol = IP_PROTOCOL_IP_IN_IP;
+ }
+ else
+ ip0->protocol = IP_PROTOCOL_IP_IN_IP;
}
/**
@@ -1816,13 +1825,37 @@ sr_policy_rewrite_encaps_l2 (vlib_main_t * vm, vlib_node_runtime_t * node,
ip3->payload_length =
clib_host_to_net_u16 (b3->current_length - sizeof (ip6_header_t));
- sr0 = (void *) (ip0 + 1);
- sr1 = (void *) (ip1 + 1);
- sr2 = (void *) (ip2 + 1);
- sr3 = (void *) (ip3 + 1);
+ if (ip0->protocol == IP_PROTOCOL_IPV6_ROUTE)
+ {
+ sr0 = (void *) (ip0 + 1);
+ sr0->protocol = IP_PROTOCOL_IP6_NONXT;
+ }
+ else
+ ip0->protocol = IP_PROTOCOL_IP6_NONXT;
+
+ if (ip1->protocol == IP_PROTOCOL_IPV6_ROUTE)
+ {
+ sr1 = (void *) (ip1 + 1);
+ sr1->protocol = IP_PROTOCOL_IP6_NONXT;
+ }
+ else
+ ip1->protocol = IP_PROTOCOL_IP6_NONXT;
+
+ if (ip2->protocol == IP_PROTOCOL_IPV6_ROUTE)
+ {
+ sr2 = (void *) (ip2 + 1);
+ sr2->protocol = IP_PROTOCOL_IP6_NONXT;
+ }
+ else
+ ip2->protocol = IP_PROTOCOL_IP6_NONXT;
- sr0->protocol = sr1->protocol = sr2->protocol = sr3->protocol =
- IP_PROTOCOL_IP6_NONXT;
+ if (ip3->protocol == IP_PROTOCOL_IPV6_ROUTE)
+ {
+ sr3 = (void *) (ip3 + 1);
+ sr3->protocol = IP_PROTOCOL_IP6_NONXT;
+ }
+ else
+ ip3->protocol = IP_PROTOCOL_IP6_NONXT;
/* Which Traffic class and flow label do I set ? */
//ip0->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32(0|((6&0xF)<<28)|((ip0_encap->tos&0xFF)<<20));
@@ -1930,8 +1963,13 @@ sr_policy_rewrite_encaps_l2 (vlib_main_t * vm, vlib_node_runtime_t * node,
ip0->payload_length =
clib_host_to_net_u16 (b0->current_length - sizeof (ip6_header_t));
- sr0 = (void *) (ip0 + 1);
- sr0->protocol = IP_PROTOCOL_IP6_NONXT;
+ if (ip0->protocol == IP_PROTOCOL_IPV6_ROUTE)
+ {
+ sr0 = (void *) (ip0 + 1);
+ sr0->protocol = IP_PROTOCOL_IP6_NONXT;
+ }
+ else
+ ip0->protocol = IP_PROTOCOL_IP6_NONXT;
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) &&
PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))