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List: busybox
Subject: =?gb2312?B?tPC4tDogW1BhdGNoXSB1ZGhjcGM2OiBzdXBwb3J0IGdlbmVyYXRlIGEgY29u?= =?gb2312?Q?sistent_iaid?=
From: "zhousiqi (A)" <zhousiqi5 () huawei ! com>
Date: 2024-04-22 1:58:40
Message-ID: 36f2498a1888402e9a6b764c00b6e77e () huawei ! com
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Gentle ping...
Please check if the community accepts this submission.
> -----ÓʼþÔ¼þ-----
> ·¢¼þÈË: zhousiqi (A)
> ·¢ËÍʱ¼ä: 2024Äê4Ô 12ÈÕ 15:09
> ÊÕ¼þÈË: busybox@busybox.net
> Ö÷Ìâ: [Patch] udhcpc6: support generate a consistent iaid
>
> Currently, udhcpc6 does not meet the requirements for Identity Association in
> RFC 3315.
> This is a specific explanation of RFC 3315 protocol:
> https://datatracker.ietf.org/doc/html/rfc3315#section-10
> ¡°The IAID uniquely identifies the IA and must be chosen to be unique
> among the IAIDs on the client. The IAID is chosen by the client.
> For any given use of an IA by the client, the IAID for that IA MUST
> be consistent across restarts of the DHCP client.¡±
> This patch allows the client to generate a consistent IAID based on the MAC
> address.
>
> Signed-off-by: Zhou Siqi <zhousiqi5@huawei.com>
> ---
> networking/udhcp/d6_dhcpc.c | 30 ++++++++++++++++++++++++++++--
> 1 file changed, 28 insertions(+), 2 deletions(-)
>
> diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
> index a35488d..99a53c8 100644
> --- a/networking/udhcp/d6_dhcpc.c
> +++ b/networking/udhcp/d6_dhcpc.c
> @@ -741,6 +741,32 @@ static NOINLINE int send_d6_info_request(void)
> | OPTION_RECONF_ACCEPT | 0
> |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> */
> +
> +/*obtain a consistent IAID based on the MAC address*/ static int
> +d6_create_iaid() {
> + int data = 0;
> + int start_idx = 0, copy_len = 0;
> + int mac_len = 0;
> +
> + mac_len = sizeof(client_data.client_mac);
> +
> + /*
> + * A simple IAID is the last 4 bytes
> + * of the hardware address.
> + */
> + if (mac_len > 4) {
> + start_idx = mac_len - 4;
> + copy_len = 4;
> + } else {
> + copy_len = mac_len;
> + }
> +
> + memcpy(&data, &client_data.client_mac[start_idx], copy_len);
> +
> + return data;
> +}
> +
> /* NOINLINE: limit stack usage in caller */ static NOINLINE int
> send_d6_discover(struct in6_addr *requested_ipv6) { @@ -759,7 +785,7 @@
> static NOINLINE int send_d6_discover(struct in6_addr *requested_ipv6)
> client6_data.ia_na = xzalloc(len);
> client6_data.ia_na->code = D6_OPT_IA_NA;
> client6_data.ia_na->len = len - 4;
> - *(bb__aliased_uint32_t*)client6_data.ia_na->data = rand();
> /* IAID */
> + *(bb__aliased_uint32_t*)client6_data.ia_na->data =
> + d6_create_iaid(); /* IAID */
> if (requested_ipv6) {
> struct d6_option *iaaddr =
> (void*)(client6_data.ia_na->data + 4+4+4);
> iaaddr->code = D6_OPT_IAADDR; @@ -777,7
> +803,7 @@ static NOINLINE int send_d6_discover(struct in6_addr
> *requested_ipv6)
> client6_data.ia_pd = xzalloc(len);
> client6_data.ia_pd->code = D6_OPT_IA_PD;
> client6_data.ia_pd->len = len - 4;
> - *(bb__aliased_uint32_t*)client6_data.ia_pd->data = rand();
> /* IAID */
> + *(bb__aliased_uint32_t*)client6_data.ia_pd->data =
> + d6_create_iaid(); /* IAID */
> opt_ptr = mempcpy(opt_ptr, client6_data.ia_pd, len);
> }
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