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net: ipv4: Refactor IPv4 header length handling

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Change the length to uint16_t and work with it
through standard htons/ntohs() macros.

Signed-off-by: Oleg Zhurakivskyy <oleg.zhurakivskyy@intel.com>
This commit is contained in:
Oleg Zhurakivskyy 2018-08-08 15:22:00 +03:00 • committed by Jukka Rissanen
commit fbac80bb94
9 changed files with 13 additions and 19 deletions
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2
include/net/net_ip.h
View file

@ -286,7 +286,7 @@ struct net_ipv6_frag_hdr {
struct net_ipv4_hdr {
u8_t vhl;
u8_t tos;
u8_t len[2];
u16_t len;
u8_t id[2];
u8_t offset[2];
u8_t ttl;

3
subsys/net/ip/connection.c
View file

@ -867,8 +867,7 @@ enum net_verdict net_conn_input(enum net_ip_protocol proto, struct net_pkt *pkt)
if (IS_ENABLED(CONFIG_NET_IPV4) &&
net_pkt_family(pkt) == AF_INET) {
data_len = NET_IPV4_HDR(pkt)->len[0] * 256 +
NET_IPV4_HDR(pkt)->len[1];
data_len = ntohs(NET_IPV4_HDR(pkt)->len);
} else if (IS_ENABLED(CONFIG_NET_IPV6) &&
net_pkt_family(pkt) == AF_INET6) {
data_len = NET_IPV6_HDR(pkt)->len[0] * 256 +

5
subsys/net/ip/ipv4.c
View file

@ -70,8 +70,7 @@ void net_ipv4_finalize(struct net_pkt *pkt, u8_t next_header_proto)
total_len = net_pkt_get_len(pkt);
NET_IPV4_HDR(pkt)->len[0] = total_len >> 8;
NET_IPV4_HDR(pkt)->len[1] = total_len & 0xff;
NET_IPV4_HDR(pkt)->len = htons(total_len);
NET_IPV4_HDR(pkt)->chksum = 0;
@ -109,7 +108,7 @@ enum net_verdict net_ipv4_process_pkt(struct net_pkt *pkt)
{
struct net_ipv4_hdr *hdr = NET_IPV4_HDR(pkt);
int real_len = net_pkt_get_len(pkt);
int pkt_len = (hdr->len[0] << 8) + hdr->len[1];
int pkt_len = ntohs(hdr->len);
enum net_verdict verdict = NET_DROP;
if (real_len != pkt_len) {

3
subsys/net/ip/utils.c
View file

@ -467,8 +467,7 @@ u16_t net_calc_chksum(struct net_pkt *pkt, u8_t proto)
switch (net_pkt_family(pkt)) {
#if defined(CONFIG_NET_IPV4)
case AF_INET:
upper_layer_len = (NET_IPV4_HDR(pkt)->len[0] << 8) +
NET_IPV4_HDR(pkt)->len[1] -
upper_layer_len = ntohs(NET_IPV4_HDR(pkt)->len) -
net_pkt_ipv6_ext_len(pkt) -
net_pkt_ip_hdr_len(pkt);

3
subsys/net/l2/ethernet/ethernet.c
View file

@ -99,8 +99,7 @@ static inline void ethernet_update_length(struct net_if *iface,
*/
if (net_pkt_family(pkt) == AF_INET) {
len = ((NET_IPV4_HDR(pkt)->len[0] << 8) +
NET_IPV4_HDR(pkt)->len[1]);
len = ntohs(NET_IPV4_HDR(pkt)->len);
} else {
len = ((NET_IPV6_HDR(pkt)->len[0] << 8) +
NET_IPV6_HDR(pkt)->len[1]) +

2
subsys/usb/class/netusb/function_ecm.c
View file

@ -97,7 +97,7 @@ static size_t ecm_eth_size(void *ecm_pkt, size_t len)
switch (ntohs(hdr->type)) {
case NET_ETH_PTYPE_IP:
case NET_ETH_PTYPE_ARP:
ip_len = sys_get_be16(((struct net_ipv4_hdr *)ip_data)->len);
ip_len = ntohs(((struct net_ipv4_hdr *)ip_data)->len);
break;
case NET_ETH_PTYPE_IPV6:
ip_len = sys_get_be16(((struct net_ipv6_hdr *)ip_data)->len);

3
tests/net/dhcpv4/src/main.c
View file

@ -233,8 +233,7 @@ static void set_ipv4_header(struct net_pkt *pkt)
length = sizeof(offer) + sizeof(struct net_ipv4_hdr) +
sizeof(struct net_udp_hdr);
ipv4->len[1] = length;
ipv4->len[0] = length >> 8;
ipv4->len = htons(length);
memset(ipv4->id, 0, 4); /* id and offset */

5
tests/net/tcp/src/main.c
View file

@ -278,9 +278,8 @@ static void setup_ipv4_tcp(struct net_pkt *pkt,
ipv4.vhl = 0x45;
ipv4.tos = 0;
ipv4.len[0] = 0;
ipv4.len[1] = NET_TCPH_LEN + sizeof(data) +
sizeof(struct net_ipv4_hdr);
ipv4.len = htons(NET_TCPH_LEN + sizeof(data) +
sizeof(struct net_ipv4_hdr));
ipv4.proto = IPPROTO_TCP;

6
tests/net/udp/src/main.c
View file

@ -318,9 +318,9 @@ static void setup_ipv4_udp(struct net_pkt *pkt,
{
NET_IPV4_HDR(pkt)->vhl = 0x45;
NET_IPV4_HDR(pkt)->tos = 0;
NET_IPV4_HDR(pkt)->len[0] = 0;
NET_IPV4_HDR(pkt)->len[1] = NET_UDPH_LEN +
sizeof(struct net_ipv4_hdr) + strlen(payload);
NET_IPV4_HDR(pkt)->len = htons(NET_UDPH_LEN +
sizeof(struct net_ipv4_hdr) +
strlen(payload));
NET_IPV4_HDR(pkt)->proto = IPPROTO_UDP;