enum ofp_return_code ofp_ipv4_processing(odp_packet_t *pkt)
{
int frag_res = 0, res;
int protocol = IS_IPV4;
uint32_t flags;
struct ofp_ip *ip;
struct ofp_nh_entry *nh;
struct ofp_ifnet *dev = odp_packet_user_ptr(*pkt);
uint32_t is_ours;
ip = (struct ofp_ip *)odp_packet_l3_ptr(*pkt, NULL);
if (odp_unlikely(ip == NULL)) {
OFP_DBG("ip is NULL");
return OFP_PKT_DROP;
}
if (odp_unlikely(ofp_if_type(dev) == OFP_IFT_VXLAN)) {
struct ofp_packet_user_area *ua;
/* Look for the correct device. */
ua = ofp_packet_user_area(*pkt);
dev = ofp_get_ifnet(VXLAN_PORTS, ua->vxlan.vni);
if (!dev)
return OFP_PKT_DROP;
}
if (odp_unlikely(ip->ip_v != OFP_IPVERSION))
return OFP_PKT_DROP;
if (ofp_packet_user_area(*pkt)->chksum_flags
& OFP_L3_CHKSUM_STATUS_VALID) {
switch (odp_packet_l3_chksum_status(*pkt)) {
case ODP_PACKET_CHKSUM_OK:
break;
case ODP_PACKET_CHKSUM_UNKNOWN:
/* Checksum was not validated by HW */
if (odp_unlikely(ofp_cksum_iph(ip, ip->ip_hl)))
return OFP_PKT_DROP;
break;
case ODP_PACKET_CHKSUM_BAD:
return OFP_PKT_DROP;
break;
}
ofp_packet_user_area(*pkt)->chksum_flags &=
~OFP_L3_CHKSUM_STATUS_VALID;
} else if (odp_unlikely(ofp_cksum_iph(ip, ip->ip_hl)))
return OFP_PKT_DROP;
/* TODO: handle broadcast */
if (dev->bcast_addr == ip->ip_dst.s_addr)
return OFP_PKT_DROP;
OFP_DBG("Device IP: %s, Packet Dest IP: %s",
ofp_print_ip_addr(dev->ip_addr),
ofp_print_ip_addr(ip->ip_dst.s_addr));
is_ours = dev->ip_addr == ip->ip_dst.s_addr ||
OFP_IN_MULTICAST(odp_be_to_cpu_32(ip->ip_dst.s_addr));
if (!is_ours) {
/* This may be for some other local interface. */
nh = ofp_get_next_hop(dev->vrf, ip->ip_dst.s_addr, &flags);
if (nh)
is_ours = nh->flags & OFP_RTF_LOCAL;
}
if (is_ours) {
if (odp_be_to_cpu_16(ip->ip_off) & 0x3fff) {
frag_res = pkt_reassembly(pkt);
if (frag_res != OFP_PKT_CONTINUE)
return frag_res;
ip = (struct ofp_ip *)odp_packet_l3_ptr(*pkt, NULL);
}
OFP_HOOK(OFP_HOOK_LOCAL, *pkt, &protocol, &res);
if (res != OFP_PKT_CONTINUE) {
OFP_DBG("OFP_HOOK_LOCAL returned %d", res);
return res;
}
OFP_HOOK(OFP_HOOK_LOCAL_IPv4, *pkt, NULL, &res);
if (res != OFP_PKT_CONTINUE) {
OFP_DBG("OFP_HOOK_LOCAL_IPv4 returned %d", res);
return res;
}
return ipv4_transport_classifier(pkt, ip->ip_p);
}
OFP_HOOK(OFP_HOOK_FWD_IPv4, *pkt, nh, &res);
if (res != OFP_PKT_CONTINUE) {
OFP_DBG("OFP_HOOK_FWD_IPv4 returned %d", res);
return res;
}
if (nh == NULL) {
OFP_DBG("nh is NULL, vrf=%d dest=%x", dev->vrf, ip->ip_dst.s_addr);
return OFP_PKT_CONTINUE;
}
if (ip->ip_ttl <= 1) {
OFP_DBG("OFP_ICMP_TIMXCEED");
ofp_icmp_error(*pkt, OFP_ICMP_TIMXCEED,
OFP_ICMP_TIMXCEED_INTRANS, 0, 0);
return OFP_PKT_DROP;
}
/*
* Decrement TTL and incrementally change the IP header checksum.
*/
ip->ip_ttl--;
uint16_t a = ~odp_cpu_to_be_16(1 << 8);
if (ip->ip_sum >= a)
ip->ip_sum -= a;
else
ip->ip_sum += odp_cpu_to_be_16(1 << 8);
#ifdef OFP_SEND_ICMP_REDIRECT
/* 1. The interface on which the packet comes into the router is the
* same interface on which the packet gets routed out.
* 2. The subnet or network of the source IP address is on the same
* subnet or network of the next-hop IP address of the routed packet.
* 3. Stack configured to send redirects.
*/
#define INET_SUBNET_PREFIX(addr) \
(odp_be_to_cpu_32(addr) & ((~0) << (32 - dev->masklen)))
if (nh->port == dev->port &&
(INET_SUBNET_PREFIX(ip->ip_src.s_addr) ==
INET_SUBNET_PREFIX(nh->gw))) {
OFP_DBG("send OFP_ICMP_REDIRECT");
ofp_icmp_error(*pkt, OFP_ICMP_REDIRECT,
OFP_ICMP_REDIRECT_HOST, nh->gw, 0);
}
#endif
return ofp_ip_output_common_inline(*pkt, nh, 0);
}
enum ofp_return_code ofp_ipv4_processing(odp_packet_t pkt)
{
int res;
int protocol = IS_IPV4;
uint32_t flags;
struct ofp_ip *ip;
struct ofp_nh_entry *nh;
struct ofp_ifnet *dev = odp_packet_user_ptr(pkt);
uint32_t is_ours;
ip = (struct ofp_ip *)odp_packet_l3_ptr(pkt, NULL);
if (odp_unlikely(ip == NULL)) {
OFP_DBG("ip is NULL");
return OFP_PKT_DROP;
}
if (odp_unlikely(!PHYS_PORT(dev->port))) {
switch (dev->port) {
case GRE_PORTS:
/* Doesn't happen. */
break;
case VXLAN_PORTS: {
/* Look for the correct device. */
struct vxlan_user_data *saved = odp_packet_user_area(pkt);
dev = ofp_get_ifnet(VXLAN_PORTS, saved->vni);
if (!dev)
return OFP_PKT_DROP;
break;
}
}
}
#ifndef OFP_PERFORMANCE
if (odp_unlikely(ip->ip_v != 4))
return OFP_PKT_DROP;
if (odp_unlikely(ofp_cksum_buffer((uint16_t *) ip, ip->ip_hl<<2)))
return OFP_PKT_DROP;
/* TODO: handle broadcast */
if (dev->bcast_addr == ip->ip_dst.s_addr)
return OFP_PKT_DROP;
#endif
OFP_DBG("Device IP: %s, Packet Dest IP: %s",
ofp_print_ip_addr(dev->ip_addr),
ofp_print_ip_addr(ip->ip_dst.s_addr));
is_ours = dev->ip_addr == ip->ip_dst.s_addr ||
OFP_IN_MULTICAST(odp_be_to_cpu_32(ip->ip_dst.s_addr));
if (!is_ours) {
/* This may be for some other local interface. */
nh = ofp_get_next_hop(dev->vrf, ip->ip_dst.s_addr, &flags);
if (nh)
is_ours = nh->flags & OFP_RTF_LOCAL;
}
if (is_ours) {
if (odp_be_to_cpu_16(ip->ip_off) & 0x3fff) {
OFP_UPDATE_PACKET_STAT(rx_ip_frag, 1);
pkt = ofp_ip_reass(pkt);
if (pkt == ODP_PACKET_INVALID)
return OFP_PKT_ON_HOLD;
OFP_UPDATE_PACKET_STAT(rx_ip_reass, 1);
ip = (struct ofp_ip *)odp_packet_l3_ptr(pkt, NULL);
}
OFP_HOOK(OFP_HOOK_LOCAL, pkt, &protocol, &res);
if (res != OFP_PKT_CONTINUE) {
OFP_DBG("OFP_HOOK_LOCAL returned %d", res);
return res;
}
OFP_HOOK(OFP_HOOK_LOCAL_IPv4, pkt, NULL, &res);
if (res != OFP_PKT_CONTINUE) {
OFP_DBG("OFP_HOOK_LOCAL_IPv4 returned %d", res);
return res;
}
return ipv4_transport_classifier(pkt, ip->ip_p);
}
OFP_HOOK(OFP_HOOK_FWD_IPv4, pkt, nh, &res);
if (res != OFP_PKT_CONTINUE) {
OFP_DBG("OFP_HOOK_FWD_IPv4 returned %d", res);
return res;
}
if (nh == NULL) {
OFP_DBG("nh is NULL, vrf=%d dest=%x", dev->vrf, ip->ip_dst.s_addr);
return OFP_PKT_CONTINUE;
}
if (ip->ip_ttl <= 1) {
OFP_DBG("OFP_ICMP_TIMXCEED");
ofp_icmp_error(pkt, OFP_ICMP_TIMXCEED,
OFP_ICMP_TIMXCEED_INTRANS, 0, 0);
return OFP_PKT_DROP;
}
/*
* Decrement TTL and incrementally change the IP header checksum.
*/
ip->ip_ttl--;
uint16_t a = ~odp_cpu_to_be_16(1 << 8);
if (ip->ip_sum >= a)
ip->ip_sum -= a;
else
ip->ip_sum += odp_cpu_to_be_16(1 << 8);
#ifdef OFP_SEND_ICMP_REDIRECT
/* 1. The interface on which the packet comes into the router is the
* same interface on which the packet gets routed out.
* 2. The subnet or network of the source IP address is on the same
* subnet or network of the next-hop IP address of the routed packet.
* 3. Stack configured to send redirects.
*/
#define INET_SUBNET_PREFIX(addr) \
(odp_be_to_cpu_32(addr) & ((~0) << (32 - dev->masklen)))
if (nh->port == dev->port &&
(INET_SUBNET_PREFIX(ip->ip_src.s_addr) ==
INET_SUBNET_PREFIX(nh->gw))) {
OFP_DBG("send OFP_ICMP_REDIRECT");
ofp_icmp_error(pkt, OFP_ICMP_REDIRECT,
OFP_ICMP_REDIRECT_HOST, nh->gw, 0);
}
#endif
return ofp_ip_output(pkt, nh);
}
