AX25_HEADER_LEN
#define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
skb_pull(ourskb, AX25_HEADER_LEN - 1); /* Keep PID */
return -AX25_HEADER_LEN;
buff = skb_push(skb, AX25_HEADER_LEN);
return AX25_HEADER_LEN;
return -AX25_HEADER_LEN; /* Unfinished header */