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authorOle Troan <ot@cisco.com>2021-08-11 13:54:14 +0200
committerNeale Ranns <neale@graphiant.com>2021-08-13 18:07:23 +0000
commit8034a36a9cedc95f6762bf0a07f6617d0bf69bfe (patch)
treed22313b64c46a26c5c46fcf8c2cb799b02e92197 /src/vnet/ip/icmp4.c
parentd170681b24724c522adaf1e2f4f0e1f3289dbf82 (diff)
ip: source address selection
Implement a simple source address selection algorithm for IPv4 and IPv6. IPv6 does not yet implement RFC6724 but supports link-locals. ping now chooses correct source address for link-local destination. Added ping support for link-local multicast (e.g. allnodes). Type: feature Signed-off-by: Ole Troan <ot@cisco.com> Change-Id: I1a3382c1f7d4ace0386c2c19e4e47b045b73a3ed Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/vnet/ip/icmp4.c')
-rw-r--r--src/vnet/ip/icmp4.c26
1 files changed, 7 insertions, 19 deletions
diff --git a/src/vnet/ip/icmp4.c b/src/vnet/ip/icmp4.c
index 0363092d5d5..5f9ffa3b2b7 100644
--- a/src/vnet/ip/icmp4.c
+++ b/src/vnet/ip/icmp4.c
@@ -40,6 +40,7 @@
#include <vlib/vlib.h>
#include <vnet/ip/ip.h>
#include <vnet/pg/pg.h>
+#include <vnet/ip/ip_sas.h>
static char *icmp_error_strings[] = {
#define _(f,s) s,
@@ -254,8 +255,6 @@ ip4_icmp_error (vlib_main_t * vm,
u32 *from, *to_next;
uword n_left_from, n_left_to_next;
ip4_icmp_error_next_t next_index;
- ip4_main_t *im = &ip4_main;
- ip_lookup_main_t *lm = &im->lookup_main;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
@@ -286,7 +285,7 @@ ip4_icmp_error (vlib_main_t * vm,
vlib_buffer_t *p0, *org_p0;
ip4_header_t *ip0, *out_ip0;
icmp46_header_t *icmp0;
- u32 sw_if_index0, if_add_index0;
+ u32 sw_if_index0;
ip_csum_t sum;
org_p0 = vlib_get_buffer (vm, org_pi0);
@@ -323,25 +322,14 @@ ip4_icmp_error (vlib_main_t * vm,
out_ip0->ttl = 0xff;
out_ip0->protocol = IP_PROTOCOL_ICMP;
out_ip0->dst_address = ip0->src_address;
- if_add_index0 = ~0;
- if (PREDICT_TRUE (vec_len (lm->if_address_pool_index_by_sw_if_index)
- > sw_if_index0))
- if_add_index0 =
- lm->if_address_pool_index_by_sw_if_index[sw_if_index0];
- if (PREDICT_TRUE (if_add_index0 != ~0))
- {
- ip_interface_address_t *if_add =
- pool_elt_at_index (lm->if_address_pool, if_add_index0);
- ip4_address_t *if_ip =
- ip_interface_address_get_address (lm, if_add);
- out_ip0->src_address = *if_ip;
- }
- else
- {
- /* interface has no IP4 address - should not happen */
+ /* Prefer a source address from "offending interface" */
+ if (!ip4_sas_by_sw_if_index (sw_if_index0, &out_ip0->dst_address,
+ &out_ip0->src_address))
+ { /* interface has no IP6 address - should not happen */
next0 = IP4_ICMP_ERROR_NEXT_DROP;
error0 = ICMP4_ERROR_DROP;
}
+
out_ip0->checksum = ip4_header_checksum (out_ip0);
/* Fill icmp header fields */