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authorOle Troan <ot@cisco.com>2018-05-23 11:21:42 +0200
committerFlorin Coras <florin.coras@gmail.com>2018-05-23 16:40:39 +0000
commitda6e11b47d47c764b11304524de559dda0d0d223 (patch)
treee219f5491c6253bcdae04969d6a2321183f00bef /src/vnet/ip
parent8a9c8f1412cb1258340b18a8eb622a835ef3c37b (diff)
VPP-1283: IPv6 PMTU missing MTU value in ICMP6 message.
Fix GRE/IPv6 setting of ip->payload_length (which has never worked). Change-Id: Ie68f1cc7bbb70489d6ec97356132c783f2345e1e Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/vnet/ip')
-rw-r--r--src/vnet/ip/icmp6.c6
-rw-r--r--src/vnet/ip/ip6_forward.c42
2 files changed, 30 insertions, 18 deletions
diff --git a/src/vnet/ip/icmp6.c b/src/vnet/ip/icmp6.c
index fd5d0ecba38..6ebdef4745e 100644
--- a/src/vnet/ip/icmp6.c
+++ b/src/vnet/ip/icmp6.c
@@ -526,13 +526,15 @@ ip6_icmp_error (vlib_main_t * vm,
b->current_length = 0;
}
}
- p0->current_length =
- p0->current_length > 1280 ? 1280 : p0->current_length;
/* Add IP header and ICMPv6 header including a 4 byte data field */
vlib_buffer_advance (p0,
-sizeof (ip6_header_t) -
sizeof (icmp46_header_t) - 4);
+
+ p0->current_length =
+ p0->current_length > 1280 ? 1280 : p0->current_length;
+
out_ip0 = vlib_buffer_get_current (p0);
icmp0 = (icmp46_header_t *) & out_ip0[1];
diff --git a/src/vnet/ip/ip6_forward.c b/src/vnet/ip/ip6_forward.c
index c45b65fd22d..f4c51e22bfc 100644
--- a/src/vnet/ip/ip6_forward.c
+++ b/src/vnet/ip/ip6_forward.c
@@ -1561,6 +1561,19 @@ typedef enum
*/
#define IP6_MCAST_ADDR_MASK 0xffffffff
+always_inline void
+ip6_mtu_check (vlib_buffer_t * b, u16 packet_bytes,
+ u16 adj_packet_bytes, u32 * next, u32 * error)
+{
+ if (adj_packet_bytes >= 1280 && packet_bytes > adj_packet_bytes)
+ {
+ *error = IP6_ERROR_MTU_EXCEEDED;
+ icmp6_error_set_vnet_buffer (b, ICMP6_packet_too_big, 0,
+ adj_packet_bytes);
+ *next = IP6_REWRITE_NEXT_ICMP_ERROR;
+ }
+}
+
always_inline uword
ip6_rewrite_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
@@ -1706,16 +1719,14 @@ ip6_rewrite_inline (vlib_main_t * vm,
}
/* Check MTU of outgoing interface. */
- error0 =
- (vlib_buffer_length_in_chain (vm, p0) >
- adj0[0].
- rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED :
- error0);
- error1 =
- (vlib_buffer_length_in_chain (vm, p1) >
- adj1[0].
- rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED :
- error1);
+ ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
+ sizeof (ip6_header_t),
+ adj0[0].rewrite_header.max_l3_packet_bytes,
+ &next0, &error0);
+ ip6_mtu_check (p1, clib_net_to_host_u16 (ip1->payload_length) +
+ sizeof (ip6_header_t),
+ adj1[0].rewrite_header.max_l3_packet_bytes,
+ &next1, &error1);
/* Don't adjust the buffer for hop count issue; icmp-error node
* wants to see the IP headerr */
@@ -1849,14 +1860,13 @@ ip6_rewrite_inline (vlib_main_t * vm,
}
/* Check MTU of outgoing interface. */
- error0 =
- (vlib_buffer_length_in_chain (vm, p0) >
- adj0[0].
- rewrite_header.max_l3_packet_bytes ? IP6_ERROR_MTU_EXCEEDED :
- error0);
+ ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
+ sizeof (ip6_header_t),
+ adj0[0].rewrite_header.max_l3_packet_bytes,
+ &next0, &error0);
/* Don't adjust the buffer for hop count issue; icmp-error node
- * wants to see the IP headerr */
+ * wants to see the IP header */
if (PREDICT_TRUE (error0 == IP6_ERROR_NONE))
{
p0->current_data -= rw_len0;