108 struct ip  struct
111     unsigned int ip_hl:4;		/* header length */  argument
112     unsigned int ip_v:4;		/* version */  argument
115     unsigned int ip_v:4;		/* version */  argument
116     unsigned int ip_hl:4;		/* header length */  argument
118     u_int8_t ip_tos;			/* type of service */  argument
119     u_short ip_len;			/* total length */  argument
120     u_short ip_id;			/* identification */  argument
121     u_short ip_off;			/* fragment offset field */  argument
126     u_int8_t ip_ttl;			/* time to live */  argument
127     u_int8_t ip_p;			/* protocol */  argument
128     u_short ip_sum;			/* checksum */  argument
129     struct in_addr ip_src, ip_dst;	/* source and dest address */  argument