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net: Consolidate UDP header functions

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Make it possible to add TCP versions of the same, while reusing
IP portions. This patch should not change any behavior.

Signed-off-by: Duncan Hare <DH@Synoia.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Duncan Hare 2018-06-24 15:40:41 -07:00 committed by Joe Hershberger
parent ac3f26cc15
commit 5d457ecbef
3 changed files with 32 additions and 16 deletions
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6
include/net.h
View file

@ -597,7 +597,8 @@ int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot);
int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
/* Set IP header */
void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source);
void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
u16 pkt_len, u8 proto);
void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport,
int sport, int len);
@ -680,6 +681,9 @@ static inline void net_send_packet(uchar *pkt, int len)
* @param sport Source UDP port
* @param payload_len Length of data after the UDP header
*/
int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
int payload_len, int proto, u8 action, u32 tcp_seq_num,
u32 tcp_ack_num);
int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport,
int sport, int payload_len);

35
net/net.c
View file

@ -809,6 +809,14 @@ uchar *net_get_async_tx_pkt_buf(void)
int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
int payload_len)
{
return net_send_ip_packet(ether, dest, dport, sport, payload_len,
IPPROTO_UDP, 0, 0, 0);
}
int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
int payload_len, int proto, u8 action, u32 tcp_seq_num,
u32 tcp_ack_num)
{
uchar *pkt;
int eth_hdr_size;
@ -830,9 +838,16 @@ int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
pkt = (uchar *)net_tx_packet;
eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
pkt += eth_hdr_size;
net_set_udp_header(pkt, dest, dport, sport, payload_len);
pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
switch (proto) {
case IPPROTO_UDP:
net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport,
payload_len);
pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
break;
default:
return -EINVAL;
}
/* if MAC address was not discovered yet, do an ARP request */
if (memcmp(ether, net_null_ethaddr, 6) == 0) {
@ -1463,7 +1478,8 @@ int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
}
}
void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
u16 pkt_len, u8 proto)
{
struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
@ -1473,7 +1489,8 @@ void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
/* IP_HDR_SIZE / 4 (not including UDP) */
ip->ip_hl_v = 0x45;
ip->ip_tos = 0;
ip->ip_len = htons(IP_HDR_SIZE);
ip->ip_len = htons(pkt_len);
ip->ip_p = proto;
ip->ip_id = htons(net_ip_id++);
ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
ip->ip_ttl = 255;
@ -1482,6 +1499,8 @@ void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
net_copy_ip((void *)&ip->ip_src, &source);
/* already in network byte order */
net_copy_ip((void *)&ip->ip_dst, &dest);
ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
}
void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
@ -1497,10 +1516,8 @@ void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
if (len & 1)
pkt[IP_UDP_HDR_SIZE + len] = 0;
net_set_ip_header(pkt, dest, net_ip);
ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
ip->ip_p = IPPROTO_UDP;
ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
IPPROTO_UDP);
ip->udp_src = htons(sport);
ip->udp_dst = htons(dport);

7
net/ping.c
View file

@ -22,14 +22,9 @@ static void set_icmp_header(uchar *pkt, struct in_addr dest)
/*
* Construct an IP and ICMP header.
*/
struct ip_hdr *ip = (struct ip_hdr *)pkt;
struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
net_set_ip_header(pkt, dest, net_ip);
ip->ip_len = htons(IP_ICMP_HDR_SIZE);
ip->ip_p = IPPROTO_ICMP;
ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);
net_set_ip_header(pkt, dest, net_ip, IP_ICMP_HDR_SIZE, IPPROTO_ICMP);
icmp->type = ICMP_ECHO_REQUEST;
icmp->code = 0;