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authorNeale Ranns <neale@graphiant.com>2022-03-04 11:45:41 +0000
committerNeale Ranns <neale@graphiant.com>2022-03-07 09:02:01 +0000
commitec5371e3e31b7860d6b3996fd10420566a4377f2 (patch)
tree13c540d79e88d940e35e776b8c288d2642ce1ea5 /src/vnet/mpls
parent7e721954d4ea31a26ad44872acc199c91b9595e6 (diff)
ip: Fixes for IPv6 and MPLS fragmentation
Type: fix - IPv6 fragmentation did not work if the packet spaneed multiple buffers, because the 'len' calculation to did max out at the size of a buffer - IPv6 fragmentation did not work when the l2unfragmentable size was non-zero, it was not used in the correct places - IPv6oMPLS fragmentation would fragment all IPv6, it should do so only for link local - IPv6oMPLS should send back TooBig ICMP6 for non locally generated Signed-off-by: Neale Ranns <neale@graphiant.com> Change-Id: Ie8f02cdfdd7b7e8474e62b6d0acda8f20c371184
Diffstat (limited to 'src/vnet/mpls')
-rw-r--r--src/vnet/mpls/mpls_output.c105
1 files changed, 64 insertions, 41 deletions
diff --git a/src/vnet/mpls/mpls_output.c b/src/vnet/mpls/mpls_output.c
index 3699163a155..faeba748e89 100644
--- a/src/vnet/mpls/mpls_output.c
+++ b/src/vnet/mpls/mpls_output.c
@@ -377,11 +377,12 @@ typedef struct mpls_frag_trace_t_
typedef enum
{
- MPLS_FRAG_NEXT_REWRITE,
- MPLS_FRAG_NEXT_REWRITE_MIDCHAIN,
- MPLS_FRAG_NEXT_ICMP_ERROR,
- MPLS_FRAG_NEXT_DROP,
- MPLS_FRAG_N_NEXT,
+ MPLS_FRAG_NEXT_REWRITE,
+ MPLS_FRAG_NEXT_REWRITE_MIDCHAIN,
+ MPLS_FRAG_NEXT_ICMP4_ERROR,
+ MPLS_FRAG_NEXT_ICMP6_ERROR,
+ MPLS_FRAG_NEXT_DROP,
+ MPLS_FRAG_N_NEXT,
} mpls_frag_next_t;
static uword
@@ -390,9 +391,7 @@ mpls_frag (vlib_main_t * vm,
vlib_frame_t * frame)
{
u32 n_left_from, next_index, * from, * to_next, n_left_to_next, *frags;
- vlib_node_runtime_t * error_node;
- error_node = vlib_node_get_runtime (vm, mpls_output_node.index);
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
@@ -410,8 +409,7 @@ mpls_frag (vlib_main_t * vm,
mpls_frag_next_t next0;
u32 pi0, adj_index0;
ip_frag_error_t error0 = IP_FRAG_ERROR_NONE;
- i16 encap_size;
- u16 mtu;
+ i16 encap_size, mtu;
u8 is_ip4;
pi0 = to_next[0] = from[0];
@@ -422,6 +420,7 @@ mpls_frag (vlib_main_t * vm,
adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
adj0 = adj_get (adj_index0);
+
/* the size of the MPLS stack */
encap_size = vnet_buffer (p0)->l3_hdr_offset - p0->current_data;
mtu = adj0->rewrite_header.max_l3_packet_bytes - encap_size;
@@ -430,7 +429,18 @@ mpls_frag (vlib_main_t * vm,
if (is_ip4)
error0 = ip4_frag_do_fragment (vm, pi0, mtu, encap_size, &frags);
else
- error0 = ip6_frag_do_fragment (vm, pi0, mtu, encap_size, &frags);
+ {
+ if (!(p0->flags & VNET_BUFFER_F_LOCALLY_ORIGINATED))
+ {
+ /* only fragment locally generated IPv6 */
+ error0 = IP_FRAG_ERROR_DONT_FRAGMENT_SET;
+ }
+ else
+ {
+ error0 =
+ ip6_frag_do_fragment (vm, pi0, mtu, encap_size, &frags);
+ }
+ }
if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
{
@@ -443,24 +453,41 @@ mpls_frag (vlib_main_t * vm,
if (PREDICT_TRUE (error0 == IP_FRAG_ERROR_NONE))
{
/* Free original buffer chain */
- vlib_buffer_free_one (vm, pi0); /* Free original packet */
+ vlib_buffer_free_one (vm, pi0);
next0 = (IP_LOOKUP_NEXT_MIDCHAIN == adj0->lookup_next_index ?
MPLS_FRAG_NEXT_REWRITE_MIDCHAIN :
MPLS_FRAG_NEXT_REWRITE);
}
- else if (is_ip4 && error0 == IP_FRAG_ERROR_DONT_FRAGMENT_SET)
- {
- icmp4_error_set_vnet_buffer (
- p0, ICMP4_destination_unreachable,
- ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
- vnet_buffer (p0)->ip_frag.mtu);
- next0 = MPLS_FRAG_NEXT_ICMP_ERROR;
- }
else
{
- vlib_error_count (vm, mpls_output_node.index, error0, 1);
- vec_add1 (frags, pi0); /* Get rid of the original buffer */
- next0 = MPLS_FRAG_NEXT_DROP;
+ vlib_error_count (vm, node->node_index, error0, 1);
+
+ if (error0 == IP_FRAG_ERROR_DONT_FRAGMENT_SET)
+ {
+ vlib_buffer_advance (p0, encap_size);
+ if (is_ip4)
+ {
+ icmp4_error_set_vnet_buffer (
+ p0, ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set,
+ vnet_buffer (p0)->ip_frag.mtu);
+ next0 = MPLS_FRAG_NEXT_ICMP4_ERROR;
+ }
+ else
+ {
+ icmp6_error_set_vnet_buffer (
+ p0, ICMP6_packet_too_big, 0,
+ adj0->rewrite_header.max_l3_packet_bytes);
+ next0 = MPLS_FRAG_NEXT_ICMP6_ERROR;
+ }
+ }
+ else
+ {
+ next0 = MPLS_FRAG_NEXT_DROP;
+ }
+
+ /* Get rid of the original buffer */
+ vec_add1 (frags, pi0);
}
/* Send fragments that were added in the frame */
@@ -480,9 +507,6 @@ mpls_frag (vlib_main_t * vm,
to_next += 1;
n_left_to_next -= 1;
- p0 = vlib_get_buffer (vm, i);
- p0->error = error_node->errors[error0];
-
vlib_validate_buffer_enqueue_x1 (
vm, node, next_index, to_next, n_left_to_next, i, next0);
}
@@ -511,22 +535,21 @@ format_mpls_frag_trace (u8 * s, va_list * args)
}
VLIB_REGISTER_NODE (mpls_frag_node) = {
- .function = mpls_frag,
- .name = "mpls-frag",
- .vector_size = sizeof (u32),
- .format_trace = format_mpls_frag_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
-
- .n_errors = IP_FRAG_N_ERROR,
- .error_strings = mpls_frag_error_strings,
-
- .n_next_nodes = MPLS_FRAG_N_NEXT,
- .next_nodes = {
- [MPLS_FRAG_NEXT_REWRITE] = "mpls-output",
- [MPLS_FRAG_NEXT_REWRITE_MIDCHAIN] = "mpls-midchain",
- [MPLS_FRAG_NEXT_ICMP_ERROR] = "ip4-icmp-error",
- [MPLS_FRAG_NEXT_DROP] = "mpls-drop"
- },
+ .function = mpls_frag,
+ .name = "mpls-frag",
+ .vector_size = sizeof (u32),
+ .format_trace = format_mpls_frag_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = IP_FRAG_N_ERROR,
+ .error_strings = mpls_frag_error_strings,
+
+ .n_next_nodes = MPLS_FRAG_N_NEXT,
+ .next_nodes = { [MPLS_FRAG_NEXT_REWRITE] = "mpls-output",
+ [MPLS_FRAG_NEXT_REWRITE_MIDCHAIN] = "mpls-midchain",
+ [MPLS_FRAG_NEXT_ICMP4_ERROR] = "ip4-icmp-error",
+ [MPLS_FRAG_NEXT_ICMP6_ERROR] = "ip6-icmp-error",
+ [MPLS_FRAG_NEXT_DROP] = "mpls-drop" },
};
/*