[PATCH v3 08/15] efi_loader: device_path: add support for HTTP device path

Adriano Cordova
2024-11-12T02:49:30Z

Add efi_dp_from_http to form a device path from HTTP. The
device path is the concatenation of the device path returned
by efi_dp_from_ipv4 together with an URI node and an END node.

Signed-off-by: Adriano Cordova <adrianox@gmail.com>
---

Changes in v3:
- Moved argument checks in efi_dp_from_http to the beginning of the function

include/efi_loader.h | 1 +
lib/efi_loader/efi_device_path.c | 55 ++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+)

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 612bc42816..96b204dfc3 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -872,6 +872,7 @@ struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part);
struct efi_device_path *efi_dp_from_file(const struct efi_device_path *dp,
const char *path);
struct efi_device_path *efi_dp_from_eth(void);
+struct efi_device_path *efi_dp_from_http(const char *server);
struct efi_device_path *efi_dp_from_mem(uint32_t mem_type,
uint64_t start_address,
size_t size);
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 82a45da1fa..158f08b9e5 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -1012,6 +1012,61 @@ struct efi_device_path *efi_dp_from_ipv4(struct efi_ipv4_address *ip,
return dp2;
}

+struct efi_device_path *efi_dp_from_http(const char *server)
+{
+ struct efi_device_path *dp1, *dp2;
+ struct efi_device_path_uri *uridp;
+ efi_uintn_t uridp_len;
+ char *pos;
+ char tmp[128];
+ struct efi_ipv4_address ip;
+ struct efi_ipv4_address mask;
+
+ if ((server && strlen("http://") + strlen(server) + 1 > 128) ||
+ (!server && IS_ENABLED(CONFIG_NET_LWIP)))
+ return NULL;
+
+ efi_net_get_addr(&ip, &mask, NULL);
+
+ dp1 = efi_dp_from_ipv4(&ip, &mask, NULL);
+
+ strcpy(tmp, "http://");
+
+#if IS_ENABLED(CONFIG_NET_LWIP)
+ if (server) {
+ memcpy(tmp + strlen("http://"), server, strlen(server) + 1);
+ }
+#else
+ if (server) {
+ memcpy(tmp + strlen("http://"), server, strlen(server) + 1);
+ } else {
+ ip_to_string(net_server_ip, tmp + strlen("http://"));
+ }
+#endif
+
+ uridp_len = sizeof(struct efi_device_path) + strlen(tmp) + 1;
+ uridp = efi_alloc(uridp_len + sizeof(END));
+ if (!uridp) {
+ log_err("Out of memory\n");
+ return NULL;
+ }
+ uridp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
+ uridp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_URI;
+ uridp->dp.length = uridp_len;
+ debug("device path: setting uri device path to %s\n", tmp);
+ memcpy(uridp->uri, tmp, strlen(tmp) + 1);
+
+ pos = (char *)uridp + uridp_len;
+ memcpy(pos, &END, sizeof(END));
+
+ dp2 = efi_dp_concat(dp1, (const struct efi_device_path *)uridp, 0);
+
+ efi_free_pool(uridp);
+ 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,
--
2.43.0