static struct ip_header *
pull_ip(struct ofpbuf *packet)
{
if (packet->size >= IP_HEADER_LEN) {
struct ip_header *ip = packet->data;
int ip_len = IP_IHL(ip->ip_ihl_ver) * 4;
if (ip_len >= IP_HEADER_LEN && packet->size >= ip_len) {
return ofpbuf_pull(packet, ip_len);
}
}
return NULL;
}
void *
netdev_tnl_ip_extract_tnl_md(struct dp_packet *packet, struct flow_tnl *tnl,
unsigned int *hlen)
{
void *nh;
struct ip_header *ip;
struct ovs_16aligned_ip6_hdr *ip6;
void *l4;
int l3_size;
nh = dp_packet_l3(packet);
ip = nh;
ip6 = nh;
l4 = dp_packet_l4(packet);
if (!nh || !l4) {
return NULL;
}
*hlen = sizeof(struct eth_header);
l3_size = dp_packet_size(packet) -
((char *)nh - (char *)dp_packet_data(packet));
if (IP_VER(ip->ip_ihl_ver) == 4) {
ovs_be32 ip_src, ip_dst;
if (csum(ip, IP_IHL(ip->ip_ihl_ver) * 4)) {
VLOG_WARN_RL(&err_rl, "ip packet has invalid checksum");
return NULL;
}
if (ntohs(ip->ip_tot_len) > l3_size) {
VLOG_WARN_RL(&err_rl, "ip packet is truncated (IP length %d, actual %d)",
ntohs(ip->ip_tot_len), l3_size);
return NULL;
}
if (IP_IHL(ip->ip_ihl_ver) * 4 > sizeof(struct ip_header)) {
VLOG_WARN_RL(&err_rl, "ip options not supported on tunnel packets "
"(%d bytes)", IP_IHL(ip->ip_ihl_ver) * 4);
return NULL;
}
ip_src = get_16aligned_be32(&ip->ip_src);
ip_dst = get_16aligned_be32(&ip->ip_dst);
tnl->ip_src = ip_src;
tnl->ip_dst = ip_dst;
tnl->ip_tos = ip->ip_tos;
tnl->ip_ttl = ip->ip_ttl;
*hlen += IP_HEADER_LEN;
} else if (IP_VER(ip->ip_ihl_ver) == 6) {
ovs_be32 tc_flow = get_16aligned_be32(&ip6->ip6_flow);
memcpy(tnl->ipv6_src.s6_addr, ip6->ip6_src.be16, sizeof ip6->ip6_src);
memcpy(tnl->ipv6_dst.s6_addr, ip6->ip6_dst.be16, sizeof ip6->ip6_dst);
tnl->ip_tos = ntohl(tc_flow) >> 20;
tnl->ip_ttl = ip6->ip6_hlim;
*hlen += IPV6_HEADER_LEN;
} else {
