diff options
| author |   Ole Troan <ot@cisco.com> | 2021-08-11 13:54:14 +0200 |
|---|---|---|
| committer |   Neale Ranns <neale@graphiant.com> | 2021-08-13 18:07:23 +0000 |
| commit | 8034a36a9cedc95f6762bf0a07f6617d0bf69bfe (patch) | |
| tree | d22313b64c46a26c5c46fcf8c2cb799b02e92197 /src/vnet/ip/icmp4.c | |
| parent | d170681b24724c522adaf1e2f4f0e1f3289dbf82 (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.c | 26 |
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 */ |