gfwleak/tango-tsg-service-chaining-engine
Archived
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

TSG-17749 tsg-service-chaining-engine更改VXLAN Frame源端口的计算方式

Browse Source
This commit is contained in:
luwenpeng
2023-11-20 10:31:21 +08:00
parent 83f9880ff0
commit 134d2c82b7
14 changed files with 327 additions and 271 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
common/src/utils.cpp
View File

@@ -153,79 +153,6 @@ void throughput_metrics_inc(struct throughput_metrics *iterm, uint64_t n_pkts, u
iterm->n_pkts += n_pkts;
}
/******************************************************************************
* protocol
******************************************************************************/
int checksum(uint16_t *addr, int len)
{
int sum = 0;
int nleft = len;
uint16_t ans = 0;
uint16_t *w = addr;
while (nleft > 1)
{
sum += *w++;
nleft -= 2;
}
if (nleft == 1)
{
*(char *)(&ans) = *(char *)w;
sum += ans;
}
return sum;
}
void build_udp_header(const char *l3_hdr, int l3_hdr_len, struct udp_hdr *udp_hdr, uint16_t udp_sport, uint16_t udp_dport, int payload_len)
{
memset(udp_hdr, 0, sizeof(struct udp_hdr));
int udp_hlen = sizeof(struct udp_hdr) + payload_len;
udp_hdr->uh_sport = htons(udp_sport);
udp_hdr->uh_dport = htons(udp_dport);
udp_hdr->uh_ulen = htons(udp_hlen);
udp_hdr->uh_sum = 0;
int sum = checksum((uint16_t *)l3_hdr, l3_hdr_len);
sum += ntohs(IPPROTO_UDP + udp_hlen);
sum += checksum((uint16_t *)udp_hdr, udp_hlen);
udp_hdr->uh_sum = CHECKSUM_CARRY(sum);
}
void build_ip_header(struct ip *ip_hdr, uint8_t next_protocol, uint16_t ipid, const in_addr_t src_ip, const in_addr_t dst_ip, uint16_t payload_len)
{
memset(ip_hdr, 0, sizeof(struct ip));
ip_hdr->ip_hl = 5; /* 20 byte header */
ip_hdr->ip_v = 4; /* version 4 */
ip_hdr->ip_tos = 0; /* IP tos */
ip_hdr->ip_id = htons(ipid); /* IP ID */
ip_hdr->ip_ttl = 80; /* time to live */
ip_hdr->ip_p = next_protocol; /* transport protocol */
ip_hdr->ip_src.s_addr = src_ip;
ip_hdr->ip_dst.s_addr = dst_ip;
ip_hdr->ip_len = htons(sizeof(struct ip) + payload_len); /* total length */
ip_hdr->ip_off = htons(0); /* fragmentation flags */
ip_hdr->ip_sum = 0; /* do this later */
int sum = checksum((uint16_t *)ip_hdr, 20);
ip_hdr->ip_sum = CHECKSUM_CARRY(sum);
}
// l3_protocol: ETH_P_IPV6/ETH_P_IP
void build_ether_header(struct ethhdr *eth_hdr, uint16_t next_protocol, const u_char src_mac[], const u_char dst_mac[])
{
memset(eth_hdr, 0, sizeof(struct ethhdr));
memcpy(eth_hdr->h_source, src_mac, ETH_ALEN);
memcpy(eth_hdr->h_dest, dst_mac, ETH_ALEN);
eth_hdr->h_proto = htons(next_protocol);
}
/******************************************************************************
* device
******************************************************************************/