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net: eth: Add a helper to pad a short Ethernet frame

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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>
This commit is contained in:
Bin Meng 2021-03-17 14:26:27 +08:00 • committed by Jason Wang
parent bdee969c0e
commit af774513f7
2 changed files with 34 additions and 0 deletions
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17
net/eth.c
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@ -548,3 +548,20 @@ bool eth_parse_ipv6_hdr(const struct iovec *pkt, int pkt_frags,
info->l4proto = ext_hdr.ip6r_nxt;
return true;
}
bool eth_pad_short_frame(uint8_t *padded_pkt, size_t *padded_buflen,
const void *pkt, size_t pkt_size)
{
assert(padded_buflen && *padded_buflen >= ETH_ZLEN);
if (pkt_size >= ETH_ZLEN) {
return false;
}
/* pad to minimum Ethernet frame length */
memcpy(padded_pkt, pkt, pkt_size);
memset(&padded_pkt[pkt_size], 0, ETH_ZLEN - pkt_size);
*padded_buflen = ETH_ZLEN;
return true;
}