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efi_loader: EFI_SIMPLE_NETWORK.Transmit() fill header

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Fill the media header in EFI_SIMPLE_NETWORK.Transmit().
Check that the buffer size is large enough for the header.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-08-31 10:55:29 +02:00
parent 0c7adf4b5f
commit 5947b49b09
1 changed files with 25 additions and 6 deletions
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31
lib/efi_loader/efi_net.c
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@ -409,15 +409,33 @@ static efi_status_t EFIAPI efi_net_transmit
goto out;
}
if (header_size) {
/*
* TODO: We would need to create the header
* if header_size != 0
*/
ret = EFI_UNSUPPORTED;
/* At least the IP header has to fit into the buffer */
if (buffer_size < this->mode->media_header_size) {
ret = EFI_BUFFER_TOO_SMALL;
goto out;
}
/*
* TODO:
* Support VLANs. Use net_set_ether() for copying the header. Use a
* U_BOOT_ENV_CALLBACK to update the media header size.
*/
if (header_size) {
struct ethernet_hdr *header = buffer;
if (!dest_addr || !protocol ||
header_size != this->mode->media_header_size) {
ret = EFI_INVALID_PARAMETER;
goto out;
}
if (!src_addr)
src_addr = &this->mode->current_address;
memcpy(header->et_dest, dest_addr, ARP_HLEN);
memcpy(header->et_src, src_addr, ARP_HLEN);
header->et_protlen = htons(*protocol);
}
switch (this->mode->state) {
case EFI_NETWORK_STOPPED:
ret = EFI_NOT_STARTED;
@ -764,6 +782,7 @@ efi_status_t efi_net_register(void)
netobj->net_mode.state = EFI_NETWORK_STARTED;
memcpy(netobj->net_mode.current_address.mac_addr, eth_get_ethaddr(), 6);
netobj->net_mode.hwaddr_size = ARP_HLEN;
netobj->net_mode.media_header_size = ETHER_HDR_SIZE;
netobj->net_mode.max_packet_size = PKTSIZE;
netobj->net_mode.if_type = ARP_ETHER;