Ref: https://man7.org/linux/man-pages/man7/packet.7.html
1. For `socket(AF_PACKET, int socket_type, int protocol)`: When `protocol` is set to `htons(ETH_P_ALL)`, then all protocols are received. If `protocol` is set to zero, no packets are received.
2. For `bind`: `bind` can optionally be called with a nonzero `sll_protocol` to start receiving packets for the protocols specified.
Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
76d3e6a064