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efi_loader: device_path: add efi_dp_from_ipv4

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Add efi_dp_from_ipv4 to form a device path from an ipv4 address.

Signed-off-by: Adriano Cordova <adrianox@gmail.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Adriano Cordova 2024-12-04 00:05:18 -03:00 • committed by Heinrich Schuchardt
parent 5a65b23322
commit f43641decf
1 changed files with 47 additions and 0 deletions
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47
lib/efi_loader/efi_device_path.c
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@ -974,6 +974,53 @@ struct efi_device_path __maybe_unused *efi_dp_from_eth(void)
return start;
}
/**
* efi_dp_from_ipv4() - set device path from IPv4 address
*
* Set the device path to an ethernet device path as provided by
* efi_dp_from_eth() concatenated with a device path of subtype
* DEVICE_PATH_SUB_TYPE_MSG_IPV4, and an END node.
*
* @ip: IPv4 local address
* @mask: network mask
* @srv: IPv4 remote/server address
* Return: pointer to device path, NULL on error
*/
static struct efi_device_path *efi_dp_from_ipv4(struct efi_ipv4_address *ip,
struct efi_ipv4_address *mask,
struct efi_ipv4_address *srv)
{
struct efi_device_path *dp1, *dp2, *pos;
struct {
struct efi_device_path_ipv4 ipv4dp;
struct efi_device_path end;
} dp;
memset(&dp.ipv4dp, 0, sizeof(dp.ipv4dp));
dp.ipv4dp.dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
dp.ipv4dp.dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_IPV4;
dp.ipv4dp.dp.length = sizeof(dp.ipv4dp);
dp.ipv4dp.protocol = 6;
if (ip)
memcpy(&dp.ipv4dp.local_ip_address, ip, sizeof(*ip));
if (mask)
memcpy(&dp.ipv4dp.subnet_mask, mask, sizeof(*mask));
if (srv)
memcpy(&dp.ipv4dp.remote_ip_address, srv, sizeof(*srv));
pos = &dp.end;
memcpy(pos, &END, sizeof(END));
dp1 = efi_dp_from_eth();
if (!dp1)
return NULL;
dp2 = efi_dp_concat(dp1, (const struct efi_device_path *)&dp, 0);
efi_free_pool(dp1);
return dp2;
}
/* Construct a device-path for memory-mapped image */
struct efi_device_path *efi_dp_from_mem(uint32_t memory_type,
uint64_t start_address,