Once receiving a packet by rte_eth_rx_burst(), I printed IP header as
below.
It seems that length(uint16_t) is in big endian, but ip addresses are in
little endian.
I'm confused and appreciate any comment.
### print_ipv4_header src = 11.0.168.192, dst = 2.173.248.143, length = 60,
ttl = 64, proto = 6
This log was printed with these functions.
void print_ipv4_header(struct rte_mbuf *m) {
struct ether_hdr *eth_header;
struct ipv4_hdr *ipv4_header;
uint16_t length;
uint8_t ttl, proto;
uint32_t src_ip, dst_ip;
char src_ip_str[MAX_IP_STR_LEN], dst_ip_str[MAX_IP_STR_LEN];
eth_header = rte_pktmbuf_mtod(m, struct ether_hdr *);
ipv4_header = (struct ipv4_hdr*)(eth_header + 1);
* length = rte_be_to_cpu_16(ipv4_header->total_length);*
ttl = ipv4_header->time_to_live;
proto = ipv4_header->next_proto_id;
* src_ip = rte_be_to_cpu_32(ipv4_header->src_addr);*
* dst_ip = rte_be_to_cpu_32(ipv4_header->dst_addr);*
convert_ip_to_string(src_ip_str, src_ip);
convert_ip_to_string(dst_ip_str, dst_ip);
debug("### print_ipv4_header src = %s, dst = %s, length = %d, ttl = %d,
proto = %d", src_ip_str, dst_ip_str, length, ttl, proto);
}
void convert_ip_to_string(char *str, uint32_t ip) {
unsigned char *ptr = (unsigned char *)&ip;
sprintf(str, "%u.%u.%u.%u", ptr[0], ptr[1], ptr[2], ptr[3]);
}
--
Moon-Sang Lee, SW Engineer
Email: sang0627 at gmail.com
Wisdom begins in wonder. *Socrates*
