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ip: source address selection

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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>
This commit is contained in:
Ole Troan
2021-08-11 13:54:14 +02:00
committed by Neale Ranns
parent d170681b24
commit 8034a36a9c
7 changed files with 310 additions and 201 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
src/plugins/ping/ping.c
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@@ -19,8 +19,9 @@
#include <vlib/unix/unix.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/fib_sas.h>
#include <vnet/ip/ip_sas.h>
#include <vnet/ip/ip6_link.h>
#include <vnet/ip/ip6_ll_table.h>
#include <vnet/plugin/plugin.h>
#include <vpp/app/version.h>
@@ -682,13 +683,16 @@ ip46_get_resolving_interface (u32 fib_index, ip46_address_t * pa46,
}
static u32
ip46_fib_table_get_index_for_sw_if_index (u32 sw_if_index, int is_ip6)
ip46_fib_table_get_index_for_sw_if_index (u32 sw_if_index, int is_ip6,
ip46_address_t *pa46)
{
u32 fib_table_index = is_ip6 ?
ip6_fib_table_get_index_for_sw_if_index (sw_if_index) :
ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
return fib_table_index;
if (is_ip6)
{
if (ip6_address_is_link_local_unicast (&pa46->ip6))
return ip6_ll_fib_get (sw_if_index);
return ip6_fib_table_get_index_for_sw_if_index (sw_if_index);
}
return ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
}
@@ -735,13 +739,15 @@ ip46_set_src_address (u32 sw_if_index, vlib_buffer_t * b0, int is_ip6)
{
ip6_header_t *ip6 = vlib_buffer_get_current (b0);
res = fib_sas6_get (sw_if_index, &ip6->dst_address, &ip6->src_address);
res = ip6_sas_by_sw_if_index (sw_if_index, &ip6->dst_address,
&ip6->src_address);
}
else
{
ip4_header_t *ip4 = vlib_buffer_get_current (b0);
res = fib_sas4_get (sw_if_index, &ip4->dst_address, &ip4->src_address);
res = ip4_sas_by_sw_if_index (sw_if_index, &ip4->dst_address,
&ip4->src_address);
}
return res;
}
@@ -870,12 +876,10 @@ at_most_a_frame (u32 count)
}
static int
ip46_enqueue_packet (vlib_main_t * vm, vlib_buffer_t * b0, u32 burst,
int is_ip6)
ip46_enqueue_packet (vlib_main_t *vm, vlib_buffer_t *b0, u32 burst,
u32 lookup_node_index)
{
vlib_frame_t *f = 0;
u32 lookup_node_index =
is_ip6 ? ip6_lookup_node.index : ip4_lookup_node.index;
int n_sent = 0;
u16 n_to_send;
@@ -978,7 +982,7 @@ send_ip46_ping (vlib_main_t * vm,
}
else
fib_index =
ip46_fib_table_get_index_for_sw_if_index (sw_if_index, is_ip6);
ip46_fib_table_get_index_for_sw_if_index (sw_if_index, is_ip6, pa46);
if (~0 == fib_index)
ERROR_OUT (SEND_PING_NO_TABLE);
@@ -986,7 +990,6 @@ send_ip46_ping (vlib_main_t * vm,
ERROR_OUT (SEND_PING_NO_INTERFACE);
vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index;
int l4_header_offset = ip46_fill_l3_header (pa46, b0, is_ip6);
@@ -1002,7 +1005,23 @@ send_ip46_ping (vlib_main_t * vm,
ip46_fix_len_and_csum (vm, l4_header_offset, data_len, b0, is_ip6);
int n_sent = ip46_enqueue_packet (vm, b0, burst, is_ip6);
u32 node_index = ip6_lookup_node.index;
if (is_ip6)
{
if (pa46->ip6.as_u32[0] == clib_host_to_net_u32 (0xff020000))
{
node_index = ip6_rewrite_mcast_node.index;
vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index;
vnet_buffer (b0)->sw_if_index[VLIB_TX] = sw_if_index;
vnet_buffer (b0)->ip.adj_index[VLIB_TX] =
ip6_link_get_mcast_adj (sw_if_index);
}
}
else
{
node_index = ip4_lookup_node.index;
}
int n_sent = ip46_enqueue_packet (vm, b0, burst, node_index);
if (n_sent < burst)
err = SEND_PING_NO_BUFFERS;