Revision f9302d917452e5ada93ccc8ced0f0268ae4264ec authored by Joe Stringer on 21 January 2021, 01:10:58 UTC, committed by Joe Stringer on 21 January 2021, 01:10:58 UTC
Workflow: ./contrib/go-mod/wrapper.sh This launches a docker container with your current Cilium working directory mounted into the correct gopath inside the container. Inside the container: go mod download Then, use make / unit-tests / go-mod scripts to update dependencies etc. Signed-off-by: Joe Stringer <joe@cilium.io>
1 parent c4933f1
bpf_overlay.c
/*
* Copyright (C) 2016-2019 Authors of Cilium
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <node_config.h>
#include <netdev_config.h>
#include <bpf/api.h>
#include <stdint.h>
#include <stdio.h>
#include <linux/if_packet.h>
#include "lib/tailcall.h"
#include "lib/utils.h"
#include "lib/common.h"
#include "lib/maps.h"
#include "lib/ipv6.h"
#include "lib/eth.h"
#include "lib/dbg.h"
#include "lib/trace.h"
#include "lib/l3.h"
#include "lib/drop.h"
#include "lib/identity.h"
#include "lib/nodeport.h"
#ifdef ENABLE_IPV6
static inline int handle_ipv6(struct __sk_buff *skb, __u32 *identity)
{
int ret, l4_off, l3_off = ETH_HLEN, hdrlen;
void *data_end, *data;
struct ipv6hdr *ip6;
struct bpf_tunnel_key key = {};
struct endpoint_info *ep;
bool decrypted;
/* verifier workaround (dereference of modified ctx ptr) */
if (!revalidate_data_pull(skb, &data, &data_end, &ip6))
return DROP_INVALID;
#ifdef ENABLE_NODEPORT
if (!bpf_skip_nodeport(skb)) {
int ret = nodeport_lb6(skb, *identity);
if (ret < 0)
return ret;
}
#endif
ret = encap_remap_v6_host_address(skb, false);
if (unlikely(ret < 0))
return ret;
if (!revalidate_data(skb, &data, &data_end, &ip6))
return DROP_INVALID;
decrypted = ((skb->mark & MARK_MAGIC_HOST_MASK) == MARK_MAGIC_DECRYPT);
if (decrypted) {
*identity = get_identity(skb);
} else {
if (unlikely(skb_get_tunnel_key(skb, &key, sizeof(key), 0) < 0))
return DROP_NO_TUNNEL_KEY;
*identity = key.tunnel_id;
#ifndef ALLOW_HOST_SRC
/* Any node encapsulating will map any HOST_ID source to be
* presented as REMOTE_NODE_ID, therefore any attempt to signal
* HOST_ID as source from a remote node can be droppped. */
if (*identity == HOST_ID) {
return DROP_INVALID_IDENTITY;
}
#endif /* ALLOW_HOST_SRC */
}
cilium_dbg(skb, DBG_DECAP, key.tunnel_id, key.tunnel_label);
#ifdef ENABLE_IPSEC
if (!decrypted) {
/* IPSec is not currently enforce (feature coming soon)
* so for now just handle normally
*/
if (ip6->nexthdr != IPPROTO_ESP) {
update_metrics(skb->len, METRIC_INGRESS, REASON_PLAINTEXT);
goto not_esp;
}
/* Decrypt "key" is determined by SPI */
skb->mark = MARK_MAGIC_DECRYPT;
set_identity(skb, key.tunnel_id);
/* To IPSec stack on cilium_vxlan we are going to pass
* this up the stack but eth_type_trans has already labeled
* this as an OTHERHOST type packet. To avoid being dropped
* by IP stack before IPSec can be processed mark as a HOST
* packet.
*/
skb_change_type(skb, PACKET_HOST);
return TC_ACT_OK;
} else {
key.tunnel_id = get_identity(skb);
skb->mark = 0;
}
not_esp:
#endif
/* Lookup IPv6 address in list of local endpoints */
if ((ep = lookup_ip6_endpoint(ip6)) != NULL) {
/* Let through packets to the node-ip so they are
* processed by the local ip stack */
if (ep->flags & ENDPOINT_F_HOST)
goto to_host;
__u8 nexthdr = ip6->nexthdr;
hdrlen = ipv6_hdrlen(skb, l3_off, &nexthdr);
if (hdrlen < 0)
return hdrlen;
l4_off = l3_off + hdrlen;
return ipv6_local_delivery(skb, l3_off, l4_off, key.tunnel_id, ip6, nexthdr, ep, METRIC_INGRESS);
}
to_host:
#ifdef HOST_IFINDEX
if (1) {
union macaddr host_mac = HOST_IFINDEX_MAC;
union macaddr router_mac = NODE_MAC;
int ret;
ret = ipv6_l3(skb, ETH_HLEN, (__u8 *) &router_mac.addr, (__u8 *) &host_mac.addr, METRIC_INGRESS);
if (ret != TC_ACT_OK)
return ret;
cilium_dbg_capture(skb, DBG_CAPTURE_DELIVERY, HOST_IFINDEX);
return redirect(HOST_IFINDEX, 0);
}
#else
return TC_ACT_OK;
#endif
}
__section_tail(CILIUM_MAP_CALLS, CILIUM_CALL_IPV6_FROM_LXC) int tail_handle_ipv6(struct __sk_buff *skb)
{
__u32 src_identity = 0;
int ret = handle_ipv6(skb, &src_identity);
if (IS_ERR(ret))
return send_drop_notify_error(skb, src_identity, ret, TC_ACT_SHOT, METRIC_INGRESS);
return ret;
}
#endif /* ENABLE_IPV6 */
#ifdef ENABLE_IPV4
static inline int handle_ipv4(struct __sk_buff *skb, __u32 *identity)
{
void *data_end, *data;
struct iphdr *ip4;
struct endpoint_info *ep;
struct bpf_tunnel_key key = {};
bool decrypted;
int l4_off;
/* verifier workaround (dereference of modified ctx ptr) */
if (!revalidate_data_pull(skb, &data, &data_end, &ip4))
return DROP_INVALID;
#ifdef ENABLE_NODEPORT
if (!bpf_skip_nodeport(skb)) {
int ret = nodeport_lb4(skb, *identity);
if (ret < 0)
return ret;
}
#endif
if (!revalidate_data(skb, &data, &data_end, &ip4))
return DROP_INVALID;
decrypted = ((skb->mark & MARK_MAGIC_HOST_MASK) == MARK_MAGIC_DECRYPT);
/* If packets are decrypted the key has already been pushed into metadata. */
if (decrypted) {
*identity = get_identity(skb);
} else {
if (unlikely(skb_get_tunnel_key(skb, &key, sizeof(key), 0) < 0))
return DROP_NO_TUNNEL_KEY;
*identity = key.tunnel_id;
#ifndef ALLOW_HOST_SRC
if (*identity == HOST_ID) {
return DROP_INVALID_IDENTITY;
}
#endif /* ALLOW_HOST_SRC */
}
l4_off = ETH_HLEN + ipv4_hdrlen(ip4);
#ifdef ENABLE_IPSEC
if (!decrypted) {
/* IPSec is not currently enforce (feature coming soon)
* so for now just handle normally
*/
if (ip4->protocol != IPPROTO_ESP) {
update_metrics(skb->len, METRIC_INGRESS, REASON_PLAINTEXT);
goto not_esp;
}
skb->mark = MARK_MAGIC_DECRYPT;
set_identity(skb, key.tunnel_id);
/* To IPSec stack on cilium_vxlan we are going to pass
* this up the stack but eth_type_trans has already labeled
* this as an OTHERHOST type packet. To avoid being dropped
* by IP stack before IPSec can be processed mark as a HOST
* packet.
*/
skb_change_type(skb, PACKET_HOST);
return TC_ACT_OK;
} else {
key.tunnel_id = get_identity(skb);
skb->mark = 0;
}
not_esp:
#endif
/* Lookup IPv4 address in list of local endpoints */
if ((ep = lookup_ip4_endpoint(ip4)) != NULL) {
/* Let through packets to the node-ip so they are
* processed by the local ip stack */
if (ep->flags & ENDPOINT_F_HOST)
goto to_host;
return ipv4_local_delivery(skb, ETH_HLEN, l4_off, key.tunnel_id, ip4, ep, METRIC_INGRESS);
}
to_host:
#ifdef HOST_IFINDEX
if (1) {
union macaddr host_mac = HOST_IFINDEX_MAC;
union macaddr router_mac = NODE_MAC;
int ret;
ret = ipv4_l3(skb, ETH_HLEN, (__u8 *) &router_mac.addr, (__u8 *) &host_mac.addr, ip4);
if (ret != TC_ACT_OK)
return ret;
cilium_dbg_capture(skb, DBG_CAPTURE_DELIVERY, HOST_IFINDEX);
return redirect(HOST_IFINDEX, 0);
}
#else
return TC_ACT_OK;
#endif
}
__section_tail(CILIUM_MAP_CALLS, CILIUM_CALL_IPV4_FROM_LXC) int tail_handle_ipv4(struct __sk_buff *skb)
{
__u32 src_identity = 0;
int ret = handle_ipv4(skb, &src_identity);
if (IS_ERR(ret))
return send_drop_notify_error(skb, src_identity, ret, TC_ACT_SHOT, METRIC_INGRESS);
return ret;
}
#endif /* ENABLE_IPV4 */
__section("from-overlay")
int from_overlay(struct __sk_buff *skb)
{
__u16 proto;
int ret;
bpf_clear_cb(skb);
bpf_clear_nodeport(skb);
if (!validate_ethertype(skb, &proto)) {
/* Pass unknown traffic to the stack */
ret = TC_ACT_OK;
goto out;
}
#ifdef ENABLE_IPSEC
if ((skb->mark & MARK_MAGIC_HOST_MASK) == MARK_MAGIC_DECRYPT) {
send_trace_notify(skb, TRACE_FROM_OVERLAY, get_identity(skb), 0, 0,
skb->ingress_ifindex,
TRACE_REASON_ENCRYPTED, TRACE_PAYLOAD_LEN);
} else
#endif
{
send_trace_notify(skb, TRACE_FROM_OVERLAY, 0, 0, 0,
skb->ingress_ifindex, 0, TRACE_PAYLOAD_LEN);
}
switch (proto) {
case bpf_htons(ETH_P_IPV6):
#ifdef ENABLE_IPV6
ep_tail_call(skb, CILIUM_CALL_IPV6_FROM_LXC);
ret = DROP_MISSED_TAIL_CALL;
#else
ret = DROP_UNKNOWN_L3;
#endif
break;
case bpf_htons(ETH_P_IP):
#ifdef ENABLE_IPV4
ep_tail_call(skb, CILIUM_CALL_IPV4_FROM_LXC);
ret = DROP_MISSED_TAIL_CALL;
#else
ret = DROP_UNKNOWN_L3;
#endif
break;
default:
/* Pass unknown traffic to the stack */
ret = TC_ACT_OK;
}
out:
if (IS_ERR(ret))
return send_drop_notify_error(skb, 0, ret, TC_ACT_SHOT, METRIC_INGRESS);
return ret;
}
#ifdef ENABLE_NODEPORT
declare_tailcall_if(is_defined(ENABLE_IPV6), CILIUM_CALL_ENCAP_NODEPORT_NAT)
int tail_handle_nat_fwd(struct __sk_buff *skb)
{
int ret;
if ((skb->mark & MARK_MAGIC_SNAT_DONE) == MARK_MAGIC_SNAT_DONE)
return TC_ACT_OK;
ret = nodeport_nat_fwd(skb, true);
if (IS_ERR(ret))
return send_drop_notify_error(skb, 0, ret, TC_ACT_SHOT, METRIC_EGRESS);
return ret;
}
#endif
__section("to-overlay")
int to_overlay(struct __sk_buff *skb)
{
int ret = encap_remap_v6_host_address(skb, true);
if (unlikely(ret < 0))
goto out;
#ifdef ENABLE_NODEPORT
invoke_tailcall_if(is_defined(ENABLE_IPV6),
CILIUM_CALL_ENCAP_NODEPORT_NAT, tail_handle_nat_fwd);
#endif
out:
if (IS_ERR(ret))
return send_drop_notify_error(skb, 0, ret, TC_ACT_SHOT, METRIC_EGRESS);
return ret;
}
BPF_LICENSE("GPL");
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...