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| author | Bin Meng <bmeng.cn@gmail.com> | 2021-03-17 14:26:27 +0800 |
|---|---|---|
| committer | Jason Wang <jasowang@redhat.com> | 2021-03-22 17:34:31 +0800 |
| commit | af774513f7d646badfdb5b686650254f7f08af6b (patch) | |
| tree | 42cbc1d3a53f55415bb40da770b15bd7a40ba584 /include/net | |
| parent | bdee969c0e65d4d509932b1d70e3a3b2ffbff6d5 (diff) | |
| download | qemu-af774513f7d646badfdb5b686650254f7f08af6b.zip qemu-af774513f7d646badfdb5b686650254f7f08af6b.tar.gz qemu-af774513f7d646badfdb5b686650254f7f08af6b.tar.bz2 | |
net: eth: Add a helper to pad a short Ethernet frame
Add a helper to pad a short Ethernet frame to the minimum required
length, which can be used by backends' code.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/eth.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/net/eth.h b/include/net/eth.h index 0671be6..7767ae8 100644 --- a/include/net/eth.h +++ b/include/net/eth.h @@ -31,6 +31,7 @@ #define ETH_ALEN 6 #define ETH_HLEN 14 +#define ETH_ZLEN 60 /* Min. octets in frame without FCS */ struct eth_header { uint8_t h_dest[ETH_ALEN]; /* destination eth addr */ @@ -422,4 +423,20 @@ bool eth_parse_ipv6_hdr(const struct iovec *pkt, int pkt_frags, size_t ip6hdr_off, eth_ip6_hdr_info *info); +/** + * eth_pad_short_frame - pad a short frame to the minimum Ethernet frame length + * + * If the Ethernet frame size is shorter than 60 bytes, it will be padded to + * 60 bytes at the address @padded_pkt. + * + * @padded_pkt: buffer address to hold the padded frame + * @padded_buflen: pointer holding length of @padded_pkt. If the frame is + * padded, the length will be updated to the padded one. + * @pkt: address to hold the original Ethernet frame + * @pkt_size: size of the original Ethernet frame + * @return true if the frame is padded, otherwise false + */ +bool eth_pad_short_frame(uint8_t *padded_pkt, size_t *padded_buflen, + const void *pkt, size_t pkt_size); + #endif |