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net: ipv6: Add support for default gateway discovery.

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In IPv6, the default gateway and prefix length are determined by receiving
a router advertisement as defined in -
https://www.rfc-editor.org/rfc/rfc4861.

Add support for sending router solicitation (RS) and processing router
advertisements (RA).

If the RA has prefix info option and following conditions are met, then
gatewayip6 and net_prefix_length of ip6addr env variables are initialized.
These are later consumed by IPv6 code for non-local destination IP.

- "Router Lifetime" != 0
- Prefix is NOT link-local prefix (0xfe80::/10)
- L flag is 1
- "Valid Lifetime" != 0

Timing Parameters:
- MAX_RTR_SOLICITATION_DELAY (0-1s)
- RTR_SOLICITATION_INTERVAL (4s) (min retransmit delay)
- MAX_RTR_SOLICITATIONS (3 RS transmissions)

The functionality is enabled by CONFIG_IPV6_ROUTER_DISCOVERY and invoked
automatically from net_init_loop().

Signed-off-by: Ehsan Mohandesi <emohandesi@linux.microsoft.com>
Tested-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>Reviewed-by:
Tested-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>
Reviewed-by: Viacheslav Mitrofanov <v.v.mitrofanov@yadro.com>
Tested-by: Sergei Antonov <saproj@gmail.com>
Reviewed-by: Sergei Antonov <saproj@gmail.com>
This commit is contained in:
Ehsan Mohandesi
2023-04-21 17:08:21 -07:00
committed by Tom Rini
parent 09005c2fb2
commit 6de98b60ba
7 changed files with 338 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
net/net.c
View File

@@ -24,7 +24,7 @@
* - name of bootfile
* Next step: ARP
*
* LINK_LOCAL:
* LINKLOCAL:
*
* Prerequisites: - own ethernet address
* We want: - own IP address
@@ -124,6 +124,7 @@
#include "wol.h"
#endif
#include "dhcpv6.h"
#include "net_rand.h"
/** BOOTP EXTENTIONS **/
@@ -350,6 +351,8 @@ void net_auto_load(void)
static int net_init_loop(void)
{
static bool first_call = true;
if (eth_get_dev()) {
memcpy(net_ethaddr, eth_get_ethaddr(), 6);
@@ -369,6 +372,12 @@ static int net_init_loop(void)
*/
return -ENONET;
if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
if (first_call && use_ip6) {
first_call = false;
srand_mac(); /* This is for rand used in ip6_send_rs. */
net_loop(RS);
}
return 0;
}
@@ -587,6 +596,10 @@ restart:
ncsi_probe_packages();
break;
#endif
case RS:
if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
ip6_send_rs();
break;
default:
break;
}
@@ -684,7 +697,13 @@ restart:
x = time_handler;
time_handler = (thand_f *)0;
(*x)();
}
} else if (IS_ENABLED(CONFIG_IPV6_ROUTER_DISCOVERY))
if (time_handler && protocol == RS)
if (!ip6_is_unspecified_addr(&net_gateway6) &&
net_prefix_length != 0) {
net_set_state(NETLOOP_SUCCESS);
net_set_timeout_handler(0, NULL);
}
if (net_state == NETLOOP_FAIL)
ret = net_start_again();