https://github.com/cilium/cilium
Tip revision: d43085fc3dbae97551c430ff34481b18f29f7c98 authored by Daniel Borkmann on 01 April 2020, 12:37:29 UTC
cilium, bpf: select v3 BPF CPU in llc for 5.7+ kernels
cilium, bpf: select v3 BPF CPU in llc for 5.7+ kernels
Tip revision: d43085f
bpf_netdev.c
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2016-2020 Authors of Cilium */
#include <bpf/ctx/skb.h>
#include <bpf/api.h>
#include <node_config.h>
#include <netdev_config.h>
/* These are configuartion options which have a default value in their
* respective header files and must thus be defined beforehand:
*
* Pass unknown ICMPv6 NS to stack */
#define ACTION_UNKNOWN_ICMP6_NS CTX_ACT_OK
/* Include policy_can_access_ingress() */
#define REQUIRES_CAN_ACCESS
#include "lib/utils.h"
#include "lib/common.h"
#include "lib/arp.h"
#include "lib/maps.h"
#include "lib/ipv6.h"
#include "lib/ipv4.h"
#include "lib/icmp6.h"
#include "lib/eth.h"
#include "lib/dbg.h"
#include "lib/trace.h"
#include "lib/identity.h"
#include "lib/l3.h"
#include "lib/l4.h"
#include "lib/drop.h"
#include "lib/encap.h"
#include "lib/nat.h"
#include "lib/lb.h"
#include "lib/nodeport.h"
#if defined FROM_HOST && (defined ENABLE_IPV4 || defined ENABLE_IPV6)
static __always_inline int rewrite_dmac_to_host(struct __ctx_buff *ctx,
__u32 src_identity)
{
/* When attached to cilium_host, we rewrite the DMAC to the mac of
* cilium_host (peer) to ensure the packet is being considered to be
* addressed to the host (PACKET_HOST) */
union macaddr cilium_net_mac = CILIUM_NET_MAC;
/* Rewrite to destination MAC of cilium_net (remote peer) */
if (eth_store_daddr(ctx, (__u8 *) &cilium_net_mac.addr, 0) < 0)
return send_drop_notify_error(ctx, src_identity, DROP_WRITE_ERROR,
CTX_ACT_OK, METRIC_INGRESS);
return CTX_ACT_OK;
}
#endif
#ifdef ENABLE_IPV6
#ifndef FROM_HOST
static __always_inline __u32
derive_src_id(const union v6addr *node_ip, struct ipv6hdr *ip6, __u32 *identity)
{
if (ipv6_match_prefix_64((union v6addr *) &ip6->saddr, node_ip)) {
/* Read initial 4 bytes of header and then extract flowlabel */
__u32 *tmp = (__u32 *) ip6;
*identity = bpf_ntohl(*tmp & IPV6_FLOWLABEL_MASK);
/* A remote node 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;
}
return 0;
}
#endif
static __always_inline __u32
resolve_srcid_ipv6(struct __ctx_buff *ctx, struct ipv6hdr *ip6,
__u32 srcid_from_proxy)
{
__u32 src_id = WORLD_ID, srcid_from_ipcache = srcid_from_proxy;
struct remote_endpoint_info *info = NULL;
union v6addr *src;
#ifndef FROM_HOST
union v6addr node_ip = {};
int ret;
BPF_V6(node_ip, ROUTER_IP);
ret = derive_src_id(&node_ip, ip6, &src_id);
if (IS_ERR(ret))
return ret;
#endif
/* Packets from the proxy will already have a real identity. */
if (identity_is_reserved(srcid_from_ipcache)) {
src = (union v6addr *) &ip6->saddr;
info = ipcache_lookup6(&IPCACHE_MAP, src, V6_CACHE_KEY_LEN);
if (info != NULL && info->sec_label)
srcid_from_ipcache = info->sec_label;
cilium_dbg(ctx, info ? DBG_IP_ID_MAP_SUCCEED6 : DBG_IP_ID_MAP_FAILED6,
((__u32 *) src)[3], srcid_from_ipcache);
}
#ifdef FROM_HOST
src_id = srcid_from_ipcache;
#elif ENABLE_SECCTX_FROM_IPCACHE
/* If we could not derive the secctx from the packet itself but
* from the ipcache instead, then use the ipcache identity. E.g.
* used in ipvlan master device's datapath on ingress.
*/
if (src_id == WORLD_ID && !identity_is_reserved(srcid_from_ipcache))
src_id = srcid_from_ipcache;
#endif
return src_id;
}
static __always_inline int handle_ipv6(struct __ctx_buff *ctx,
__u32 srcid_from_proxy)
{
struct remote_endpoint_info *info = NULL;
void *data, *data_end;
struct ipv6hdr *ip6;
union v6addr *dst;
int ret, l3_off = ETH_HLEN, hdrlen;
struct endpoint_info *ep;
__u8 nexthdr;
__u32 secctx;
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return DROP_INVALID;
#ifdef ENABLE_NODEPORT
if (!bpf_skip_nodeport(ctx)) {
int ret = nodeport_lb6(ctx, srcid_from_proxy);
if (ret < 0)
return ret;
}
#if defined(ENCAP_IFINDEX) || defined(NO_REDIRECT)
/* See IPv4 case for NO_REDIRECT comments */
return CTX_ACT_OK;
#endif /* ENCAP_IFINDEX || NO_REDIRECT */
/* Verifier workaround: modified ctx access. */
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return DROP_INVALID;
#endif /* ENABLE_NODEPORT */
nexthdr = ip6->nexthdr;
hdrlen = ipv6_hdrlen(ctx, l3_off, &nexthdr);
if (hdrlen < 0)
return hdrlen;
#ifdef HANDLE_NS
if (unlikely(nexthdr == IPPROTO_ICMPV6)) {
int ret = icmp6_handle(ctx, ETH_HLEN, ip6, METRIC_INGRESS);
if (IS_ERR(ret))
return ret;
}
#endif
secctx = resolve_srcid_ipv6(ctx, ip6, srcid_from_proxy);
#ifdef FROM_HOST
if (1) {
int ret;
/* If we are attached to cilium_host at egress, this will
* rewrite the destination mac address to the MAC of cilium_net */
ret = rewrite_dmac_to_host(ctx, secctx);
/* DIRECT PACKET READ INVALID */
if (IS_ERR(ret))
return ret;
}
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return DROP_INVALID;
#endif
/* Lookup IPv4 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)
return CTX_ACT_OK;
return ipv6_local_delivery(ctx, l3_off, secctx, ep, METRIC_INGRESS);
}
#ifdef ENCAP_IFINDEX
dst = (union v6addr *) &ip6->daddr;
info = ipcache_lookup6(&IPCACHE_MAP, dst, V6_CACHE_KEY_LEN);
if (info != NULL && info->tunnel_endpoint != 0) {
ret = encap_and_redirect_with_nodeid(ctx, info->tunnel_endpoint,
info->key,
secctx, TRACE_PAYLOAD_LEN);
/* If IPSEC is needed recirc through ingress to use xfrm stack
* and then result will routed back through bpf_netdev on egress
* but with encrypt marks.
*/
if (ret == IPSEC_ENDPOINT)
return CTX_ACT_OK;
else
return ret;
} else {
struct endpoint_key key = {};
/* IPv6 lookup key: daddr/96 */
dst = (union v6addr *) &ip6->daddr;
key.ip6.p1 = dst->p1;
key.ip6.p2 = dst->p2;
key.ip6.p3 = dst->p3;
key.ip6.p4 = 0;
key.family = ENDPOINT_KEY_IPV6;
ret = encap_and_redirect_netdev(ctx, &key, secctx, TRACE_PAYLOAD_LEN);
if (ret == IPSEC_ENDPOINT)
return CTX_ACT_OK;
else if (ret != DROP_NO_TUNNEL_ENDPOINT)
return ret;
}
#endif
dst = (union v6addr *) &ip6->daddr;
info = ipcache_lookup6(&IPCACHE_MAP, dst, V6_CACHE_KEY_LEN);
#ifdef FROM_HOST
if (info == NULL || info->sec_label == WORLD_ID) {
/* See IPv4 comment. */
return DROP_UNROUTABLE;
}
#endif
#ifdef ENABLE_IPSEC
if (info && info->key && info->tunnel_endpoint) {
__u8 key = get_min_encrypt_key(info->key);
set_encrypt_key_cb(ctx, key);
#ifdef IP_POOLS
set_encrypt_dip(ctx, info->tunnel_endpoint);
#else
set_identity_cb(ctx, secctx);
#endif
}
#endif
return CTX_ACT_OK;
}
__section_tail(CILIUM_MAP_CALLS, CILIUM_CALL_IPV6_FROM_LXC)
int tail_handle_ipv6(struct __ctx_buff *ctx)
{
__u32 proxy_identity = ctx_load_meta(ctx, CB_SRC_IDENTITY);
int ret;
ctx_store_meta(ctx, CB_SRC_IDENTITY, 0);
ret = handle_ipv6(ctx, proxy_identity);
if (IS_ERR(ret))
return send_drop_notify_error(ctx, proxy_identity, ret,
CTX_ACT_DROP, METRIC_INGRESS);
return ret;
}
#endif /* ENABLE_IPV6 */
#ifdef ENABLE_IPV4
static __always_inline __u32
resolve_srcid_ipv4(struct __ctx_buff *ctx, struct iphdr *ip4,
__u32 srcid_from_proxy)
{
__u32 src_id = WORLD_ID, srcid_from_ipcache = srcid_from_proxy;
struct remote_endpoint_info *info = NULL;
/* Packets from the proxy will already have a real identity. */
if (identity_is_reserved(srcid_from_ipcache)) {
info = ipcache_lookup4(&IPCACHE_MAP, ip4->saddr, V4_CACHE_KEY_LEN);
if (info != NULL) {
__u32 sec_label = info->sec_label;
if (sec_label) {
/* When SNAT is enabled on traffic ingressing
* into Cilium, all traffic from the world will
* have a source IP of the host. It will only
* actually be from the host if
* "srcid_from_proxy" (passed into this
* function) reports the src as the host. So we
* can ignore the ipcache if it reports the
* source as HOST_ID.
*/
#ifdef ENABLE_EXTRA_HOST_DEV
if (sec_label != HOST_ID)
#endif
srcid_from_ipcache = sec_label;
}
}
cilium_dbg(ctx, info ? DBG_IP_ID_MAP_SUCCEED4 : DBG_IP_ID_MAP_FAILED4,
ip4->saddr, srcid_from_ipcache);
}
#ifdef FROM_HOST
src_id = srcid_from_ipcache;
#elif ENABLE_SECCTX_FROM_IPCACHE
/* If we could not derive the secctx from the packet itself but
* from the ipcache instead, then use the ipcache identity. E.g.
* used in ipvlan master device's datapath on ingress.
*/
if (!identity_is_reserved(srcid_from_ipcache))
src_id = srcid_from_ipcache;
#endif
return src_id;
}
static __always_inline int handle_ipv4(struct __ctx_buff *ctx,
__u32 srcid_from_proxy)
{
struct remote_endpoint_info *info = NULL;
struct ipv4_ct_tuple tuple = {};
struct endpoint_info *ep;
void *data, *data_end;
struct iphdr *ip4;
__u32 secctx;
if (!revalidate_data(ctx, &data, &data_end, &ip4))
return DROP_INVALID;
#ifdef ENABLE_NODEPORT
if (!bpf_skip_nodeport(ctx)) {
int ret = nodeport_lb4(ctx, srcid_from_proxy);
if (ret < 0)
return ret;
}
#if defined(ENCAP_IFINDEX) || defined(NO_REDIRECT)
/* We cannot redirect a packet to a local endpoint in the direct
* routing mode, as the redirect bypasses nf_conntrack table.
* This makes a second reply from the endpoint to be MASQUERADEd or
* to be DROPed by k8s's "--ctstate INVALID -j DROP" depending via
* which interface it was inputed. */
return CTX_ACT_OK;
#endif /* ENCAP_IFINDEX || NO_REDIRECT */
/* Verifier workaround: modified ctx access. */
if (!revalidate_data(ctx, &data, &data_end, &ip4))
return DROP_INVALID;
#endif /* ENABLE_NODEPORT */
tuple.nexthdr = ip4->protocol;
secctx = resolve_srcid_ipv4(ctx, ip4, srcid_from_proxy);
#ifdef FROM_HOST
if (1) {
int ret;
/* If we are attached to cilium_host at egress, this will
* rewrite the destination mac address to the MAC of cilium_net */
ret = rewrite_dmac_to_host(ctx, secctx);
/* DIRECT PACKET READ INVALID */
if (IS_ERR(ret))
return ret;
}
if (!revalidate_data(ctx, &data, &data_end, &ip4))
return DROP_INVALID;
#endif
/* Lookup IPv4 address in list of local endpoints and host IPs */
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)
#ifdef HOST_REDIRECT_TO_INGRESS
/* This is required for L7 proxy to send packets to the host. */
return redirect(HOST_IFINDEX, BPF_F_INGRESS);
#else
return CTX_ACT_OK;
#endif
return ipv4_local_delivery(ctx, ETH_HLEN, secctx, ip4, ep, METRIC_INGRESS);
}
#ifdef ENCAP_IFINDEX
info = ipcache_lookup4(&IPCACHE_MAP, ip4->daddr, V4_CACHE_KEY_LEN);
if (info != NULL && info->tunnel_endpoint != 0) {
int ret = encap_and_redirect_with_nodeid(ctx, info->tunnel_endpoint,
info->key,
secctx, TRACE_PAYLOAD_LEN);
if (ret == IPSEC_ENDPOINT)
return CTX_ACT_OK;
else
return ret;
} else {
/* IPv4 lookup key: daddr & IPV4_MASK */
struct endpoint_key key = {};
int ret;
key.ip4 = ip4->daddr & IPV4_MASK;
key.family = ENDPOINT_KEY_IPV4;
cilium_dbg(ctx, DBG_NETDEV_ENCAP4, key.ip4, secctx);
ret = encap_and_redirect_netdev(ctx, &key, secctx, TRACE_PAYLOAD_LEN);
if (ret == IPSEC_ENDPOINT)
return CTX_ACT_OK;
else if (ret != DROP_NO_TUNNEL_ENDPOINT)
return ret;
}
#endif
#ifdef HOST_REDIRECT_TO_INGRESS
return redirect(HOST_IFINDEX, BPF_F_INGRESS);
#else
info = ipcache_lookup4(&IPCACHE_MAP, ip4->daddr, V4_CACHE_KEY_LEN);
#ifdef FROM_HOST
if (info == NULL || info->sec_label == WORLD_ID) {
/* We have received a packet for which no ipcache entry exists,
* we do not know what to do with this packet, drop it.
*
* The info == NULL test is soley to satisfy verifier requirements
* as in Cilium case we'll always hit the 0.0.0.0/32 catch-all
* entry. Therefore we need to test for WORLD_ID. It is clearly
* wrong to route a ctx to cilium_host for which we don't know
* anything about it as otherwise we'll run into a routing loop.
*/
return DROP_UNROUTABLE;
}
#endif
#ifdef ENABLE_IPSEC
if (info && info->key && info->tunnel_endpoint) {
__u8 key = get_min_encrypt_key(info->key);
set_encrypt_key_cb(ctx, key);
#ifdef IP_POOLS
set_encrypt_dip(ctx, info->tunnel_endpoint);
#else
set_identity_cb(ctx, secctx);
#endif
}
#endif
return CTX_ACT_OK;
#endif
}
__section_tail(CILIUM_MAP_CALLS, CILIUM_CALL_IPV4_FROM_LXC)
int tail_handle_ipv4(struct __ctx_buff *ctx)
{
__u32 proxy_identity = ctx_load_meta(ctx, CB_SRC_IDENTITY);
int ret;
ctx_store_meta(ctx, CB_SRC_IDENTITY, 0);
ret = handle_ipv4(ctx, proxy_identity);
if (IS_ERR(ret))
return send_drop_notify_error(ctx, proxy_identity, ret, CTX_ACT_DROP, METRIC_INGRESS);
return ret;
}
#endif /* ENABLE_IPV4 */
#ifdef ENABLE_IPSEC
#ifndef ENCAP_IFINDEX
static __always_inline int do_netdev_encrypt_pools(struct __ctx_buff *ctx)
{
int ret = 0;
#ifdef IP_POOLS
__u32 tunnel_endpoint = 0;
void *data, *data_end;
__u32 tunnel_source = IPV4_ENCRYPT_IFACE;
struct iphdr *iphdr;
__be32 sum;
tunnel_endpoint = ctx_load_meta(ctx, 4);
ctx->mark = 0;
if (!revalidate_data(ctx, &data, &data_end, &iphdr)) {
ret = DROP_INVALID;
goto drop_err;
}
/* When IP_POOLS is enabled ip addresses are not
* assigned on a per node basis so lacking node
* affinity we can not use IP address to assign the
* destination IP. Instead rewrite it here from cb[].
*/
sum = csum_diff(&iphdr->daddr, 4, &tunnel_endpoint, 4, 0);
if (ctx_store_bytes(ctx, ETH_HLEN + offsetof(struct iphdr, daddr),
&tunnel_endpoint, 4, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
if (l3_csum_replace(ctx, ETH_HLEN + offsetof(struct iphdr, check),
0, sum, 0) < 0) {
ret = DROP_CSUM_L3;
goto drop_err;
}
if (!revalidate_data(ctx, &data, &data_end, &iphdr)) {
ret = DROP_INVALID;
goto drop_err;
}
sum = csum_diff(&iphdr->saddr, 4, &tunnel_source, 4, 0);
if (ctx_store_bytes(ctx, ETH_HLEN + offsetof(struct iphdr, saddr),
&tunnel_source, 4, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
if (l3_csum_replace(ctx, ETH_HLEN + offsetof(struct iphdr, check),
0, sum, 0) < 0) {
ret = DROP_CSUM_L3;
goto drop_err;
}
drop_err:
#endif // IP_POOLS
return ret;
}
static __always_inline int do_netdev_encrypt_fib(struct __ctx_buff *ctx,
__u16 proto,
int *encrypt_iface)
{
int ret = 0;
#if HAVE_PROG_TYPE_HELPER(sched_cls, bpf_fib_lookup)
struct bpf_fib_lookup fib_params = {};
void *data, *data_end;
__be32 sum;
int err;
if (proto == bpf_htons(ETH_P_IP)) {
struct iphdr *ip4;
if (!revalidate_data(ctx, &data, &data_end, &ip4)) {
ret = DROP_INVALID;
goto drop_err_fib;
}
fib_params.family = AF_INET;
fib_params.ipv4_src = ip4->saddr;
fib_params.ipv4_dst = ip4->daddr;
} else {
struct ipv6hdr *ip6;
if (!revalidate_data(ctx, &data, &data_end, &ip6)) {
ret = DROP_INVALID;
goto drop_err_fib;
}
fib_params.family = AF_INET6;
ipv6_addr_copy((union v6addr *) &fib_params.ipv6_src, (union v6addr *) &ip6->saddr);
ipv6_addr_copy((union v6addr *) &fib_params.ipv6_dst, (union v6addr *) &ip6->daddr);
}
fib_params.ifindex = *encrypt_iface;
err = fib_lookup(ctx, &fib_params, sizeof(fib_params),
BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT);
if (err != 0) {
ret = DROP_NO_FIB;
goto drop_err_fib;
}
if (eth_store_daddr(ctx, fib_params.dmac, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err_fib;
}
if (eth_store_saddr(ctx, fib_params.smac, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err_fib;
}
*encrypt_iface = fib_params.ifindex;
drop_err_fib:
#endif /* HAVE_PROG_TYPE_HELPER(sched_cls, bpf_fib_lookup) */
return ret;
}
static __always_inline int do_netdev_encrypt(struct __ctx_buff *ctx, __u16 proto)
{
int encrypt_iface = 0;
int ret = 0;
#if defined(ENCRYPT_NODE) || HAVE_PROG_TYPE_HELPER(sched_cls, bpf_fib_lookup)
encrypt_iface = ENCRYPT_IFACE;
#endif
ret = do_netdev_encrypt_pools(ctx);
if (ret)
return send_drop_notify_error(ctx, 0, ret, CTX_ACT_DROP, METRIC_INGRESS);
ret = do_netdev_encrypt_fib(ctx, proto, &encrypt_iface);
if (ret)
return send_drop_notify_error(ctx, 0, ret, CTX_ACT_DROP, METRIC_INGRESS);
bpf_clear_cb(ctx);
#if defined(ENCRYPT_NODE) || HAVE_PROG_TYPE_HELPER(sched_cls, bpf_fib_lookup)
return redirect(encrypt_iface, 0);
#else
return CTX_ACT_OK;
#endif
}
#else /* ENCAP_IFINDEX */
static __always_inline int do_netdev_encrypt_encap(struct __ctx_buff *ctx)
{
__u32 seclabel, tunnel_endpoint = 0;
seclabel = get_identity(ctx);
tunnel_endpoint = ctx_load_meta(ctx, 4);
ctx->mark = 0;
bpf_clear_cb(ctx);
return __encap_and_redirect_with_nodeid(ctx, tunnel_endpoint, seclabel, TRACE_PAYLOAD_LEN);
}
static __always_inline int do_netdev_encrypt(struct __ctx_buff *ctx, __u16 proto __maybe_unused)
{
return do_netdev_encrypt_encap(ctx);
}
#endif /* ENCAP_IFINDEX */
#endif /* ENABLE_IPSEC */
static __always_inline int do_netdev(struct __ctx_buff *ctx, __u16 proto)
{
__u32 __maybe_unused identity = 0;
int ret;
#ifdef ENABLE_IPSEC
if (1) {
__u32 magic = ctx->mark & MARK_MAGIC_HOST_MASK;
if (magic == MARK_MAGIC_ENCRYPT)
return do_netdev_encrypt(ctx, proto);
}
#endif
bpf_clear_cb(ctx);
bpf_skip_nodeport_clear(ctx);
#ifdef FROM_HOST
if (1) {
#ifdef HOST_REDIRECT_TO_INGRESS
if (proto == bpf_htons(ETH_P_ARP)) {
union macaddr mac = HOST_IFINDEX_MAC;
return arp_respond(ctx, &mac, BPF_F_INGRESS);
}
#endif
int trace = TRACE_FROM_HOST;
bool from_proxy;
from_proxy = inherit_identity_from_host(ctx, &identity);
if (from_proxy)
trace = TRACE_FROM_PROXY;
send_trace_notify(ctx, trace, identity, 0, 0,
ctx->ingress_ifindex, 0, TRACE_PAYLOAD_LEN);
}
#else
send_trace_notify(ctx, TRACE_FROM_STACK, 0, 0, 0, ctx->ingress_ifindex,
0, TRACE_PAYLOAD_LEN);
#endif
switch (proto) {
#ifdef ENABLE_IPV6
case bpf_htons(ETH_P_IPV6):
ctx_store_meta(ctx, CB_SRC_IDENTITY, identity);
ep_tail_call(ctx, CILIUM_CALL_IPV6_FROM_LXC);
/* See comment below for IPv4. */
return send_drop_notify_error(ctx, identity, DROP_MISSED_TAIL_CALL,
CTX_ACT_OK, METRIC_INGRESS);
#endif
#ifdef ENABLE_IPV4
case bpf_htons(ETH_P_IP):
ctx_store_meta(ctx, CB_SRC_IDENTITY, identity);
ep_tail_call(ctx, CILIUM_CALL_IPV4_FROM_LXC);
/* We are not returning an error here to always allow traffic to
* the stack in case maps have become unavailable.
*
* Note: Since drop notification requires a tail call as well,
* this notification is unlikely to succeed. */
return send_drop_notify_error(ctx, identity, DROP_MISSED_TAIL_CALL,
CTX_ACT_OK, METRIC_INGRESS);
#endif
default:
/* Pass unknown traffic to the stack */
ret = CTX_ACT_OK;
}
return ret;
}
__section("from-netdev")
int from_netdev(struct __ctx_buff *ctx)
{
int ret = ret;
__u16 proto;
if (!validate_ethertype(ctx, &proto))
/* Pass unknown traffic to the stack */
return CTX_ACT_OK;
#ifdef ENABLE_MASQUERADE
cilium_dbg_capture(ctx, DBG_CAPTURE_SNAT_PRE, ctx_get_ifindex(ctx));
ret = snat_process(ctx, BPF_PKT_DIR);
if (ret != CTX_ACT_OK) {
return ret;
}
cilium_dbg_capture(ctx, DBG_CAPTURE_SNAT_POST, ctx_get_ifindex(ctx));
#endif /* ENABLE_MASQUERADE */
return do_netdev(ctx, proto);
}
__section("to-netdev")
int to_netdev(struct __ctx_buff *ctx __maybe_unused)
{
/* Cannot compile the section out entriely, test/bpf/verifier-test.sh
* workaround.
*/
int ret = CTX_ACT_OK;
#if defined(ENABLE_NODEPORT) && (!defined(ENABLE_DSR) || (defined(ENABLE_DSR) && defined(ENABLE_DSR_HYBRID)))
if ((ctx->mark & MARK_MAGIC_SNAT_DONE) == MARK_MAGIC_SNAT_DONE)
return CTX_ACT_OK;
ret = nodeport_nat_fwd(ctx, false);
if (IS_ERR(ret))
return send_drop_notify_error(ctx, 0, ret, CTX_ACT_DROP, METRIC_EGRESS);
#elif defined(ENABLE_MASQUERADE)
__u16 proto;
if (!validate_ethertype(ctx, &proto))
/* Pass unknown traffic to the stack */
return CTX_ACT_OK;
cilium_dbg_capture(ctx, DBG_CAPTURE_SNAT_PRE, ctx_get_ifindex(ctx));
ret = snat_process(ctx, BPF_PKT_DIR);
if (!ret)
cilium_dbg_capture(ctx, DBG_CAPTURE_SNAT_POST, ctx_get_ifindex(ctx));
#endif /* ENABLE_MASQUERADE */
return ret;
}
BPF_LICENSE("GPL");