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nodeport.h
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nodeport.h
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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2019-2020 Authors of Cilium */
#ifndef __NODEPORT_H_
#define __NODEPORT_H_
#include <bpf/ctx/ctx.h>
#include <bpf/api.h>
#include "tailcall.h"
#include "nat.h"
#include "edt.h"
#include "lb.h"
#include "common.h"
#include "overloadable.h"
#include "eps.h"
#include "conntrack.h"
#include "csum.h"
#include "encap.h"
#include "trace.h"
#include "ghash.h"
#include "pcap.h"
#include "host_firewall.h"
#define CB_SRC_IDENTITY 0
#ifdef ENABLE_NODEPORT
/* Define dummy values to make bpf_{lxc,overlay}.c to compile */
#ifndef NATIVE_DEV_IFINDEX
#define NATIVE_DEV_IFINDEX 0
#endif
#ifndef DSR_ENCAP_MODE
#define DSR_ENCAP_MODE 0
#define DSR_ENCAP_IPIP 2
#endif
#if defined(ENABLE_IPV4) && defined(ENABLE_MASQUERADE) && !defined(IPV4_MASQUERADE)
#define IPV4_MASQUERADE 0
#endif
#endif /* ENABLE_NODEPORT */
static __always_inline __maybe_unused void
bpf_skip_nodeport_clear(struct __ctx_buff *ctx)
{
ctx_skip_nodeport_clear(ctx);
}
static __always_inline __maybe_unused void
bpf_skip_nodeport_set(struct __ctx_buff *ctx)
{
ctx_skip_nodeport_set(ctx);
}
static __always_inline __maybe_unused bool
bpf_skip_nodeport(struct __ctx_buff *ctx)
{
return ctx_skip_nodeport(ctx);
}
#ifdef ENABLE_NODEPORT
#ifdef ENABLE_IPV4
struct bpf_elf_map __section_maps NODEPORT_NEIGH4 = {
.type = BPF_MAP_TYPE_LRU_HASH,
.size_key = sizeof(__be32), /* ipv4 addr */
.size_value = sizeof(union macaddr), /* hw addr */
.pinning = PIN_GLOBAL_NS,
.max_elem = NODEPORT_NEIGH4_SIZE,
};
#endif /* ENABLE_IPV4 */
#ifdef ENABLE_IPV6
struct bpf_elf_map __section_maps NODEPORT_NEIGH6 = {
.type = BPF_MAP_TYPE_LRU_HASH,
.size_key = sizeof(union v6addr), /* ipv6 addr */
.size_value = sizeof(union macaddr), /* hw addr */
.pinning = PIN_GLOBAL_NS,
.max_elem = NODEPORT_NEIGH6_SIZE,
};
/* The IPv6 extension should be 8-bytes aligned */
struct dsr_opt_v6 {
__u8 nexthdr;
__u8 len;
__u8 opt_type;
__u8 opt_len;
union v6addr addr;
__be32 port;
};
#endif /* ENABLE_IPV6 */
static __always_inline bool nodeport_uses_dsr(__u8 nexthdr __maybe_unused)
{
# if defined(ENABLE_DSR) && !defined(ENABLE_DSR_HYBRID)
return true;
# elif defined(ENABLE_DSR) && defined(ENABLE_DSR_HYBRID)
if (nexthdr == IPPROTO_TCP)
return true;
return false;
# else
return false;
# endif
}
static __always_inline bool nodeport_lb_hairpin(void)
{
return is_defined(ENABLE_NODEPORT_HAIRPIN);
}
static __always_inline bool fib_lookup_bypass(void)
{
return is_defined(ENABLE_FIB_LOOKUP_BYPASS);
}
static __always_inline void
bpf_mark_snat_done(struct __ctx_buff *ctx __maybe_unused)
{
/* From XDP layer, we do not go through an egress hook from
* here, hence nothing to be done.
*/
#if __ctx_is == __ctx_skb
ctx->mark |= MARK_MAGIC_SNAT_DONE;
#endif
}
static __always_inline bool
bpf_skip_recirculation(const struct __ctx_buff *ctx __maybe_unused)
{
/* From XDP layer, we do not go through an egress hook from
* here, hence nothing to be skipped.
*/
#if __ctx_is == __ctx_skb
return ctx->tc_index & TC_INDEX_F_SKIP_RECIRCULATION;
#else
return false;
#endif
}
static __always_inline __u64 ctx_adjust_hroom_dsr_flags(void)
{
#ifdef BPF_HAVE_CSUM_LEVEL
return BPF_F_ADJ_ROOM_NO_CSUM_RESET;
#else
return 0;
#endif
}
static __always_inline bool dsr_fail_needs_reply(int code __maybe_unused)
{
#ifdef ENABLE_DSR_ICMP_ERRORS
if (code == DROP_FRAG_NEEDED)
return true;
#endif
return false;
}
static __always_inline bool dsr_is_too_big(struct __ctx_buff *ctx __maybe_unused,
__u16 expanded_len __maybe_unused)
{
#ifdef ENABLE_DSR_ICMP_ERRORS
if (expanded_len > THIS_MTU)
return true;
#endif
return false;
}
static __always_inline int
maybe_add_l2_hdr(struct __ctx_buff *ctx __maybe_unused,
__u32 ifindex __maybe_unused,
bool *l2_hdr_required __maybe_unused)
{
if (IS_L3_DEV(ifindex))
/* NodePort request is going to be redirected to L3 dev, so skip
* L2 addr settings.
*/
*l2_hdr_required = false;
else if (ETH_HLEN == 0) {
/* NodePort request is going to be redirected from L3 to L2 dev,
* so we need to create L2 hdr first.
*/
__u16 proto = ctx_get_protocol(ctx);
if (ctx_change_head(ctx, __ETH_HLEN, 0))
return DROP_INVALID;
if (eth_store_proto(ctx, proto, 0) < 0)
return DROP_WRITE_ERROR;
}
return 0;
}
#ifdef ENABLE_IPV6
static __always_inline bool nodeport_uses_dsr6(const struct ipv6_ct_tuple *tuple)
{
return nodeport_uses_dsr(tuple->nexthdr);
}
/* TODO(brb): after GH#6320, we can move snat_v{4,6}_needed() to lib/nat.h, as
* then the helper function won't depend the dsr checks.
*/
static __always_inline bool snat_v6_needed(struct __ctx_buff *ctx,
union v6addr *addr)
{
void *data, *data_end;
struct ipv6hdr *ip6;
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return false;
#ifdef ENABLE_DSR_HYBRID
{
__u8 nexthdr = ip6->nexthdr;
int ret;
ret = ipv6_hdrlen(ctx, ETH_HLEN, &nexthdr);
if (ret > 0) {
if (nodeport_uses_dsr(nexthdr))
return false;
}
}
#endif /* ENABLE_DSR_HYBRID */
/* See snat_v4_needed(). */
return !ipv6_addrcmp((union v6addr *)&ip6->saddr, addr);
}
static __always_inline int nodeport_nat_ipv6_fwd(struct __ctx_buff *ctx,
union v6addr *addr)
{
struct ipv6_nat_target target = {
.min_port = NODEPORT_PORT_MIN_NAT,
.max_port = NODEPORT_PORT_MAX_NAT,
};
int ret;
ipv6_addr_copy(&target.addr, addr);
ret = snat_v6_needed(ctx, addr) ?
snat_v6_process(ctx, NAT_DIR_EGRESS, &target) : CTX_ACT_OK;
if (ret == NAT_PUNT_TO_STACK)
ret = CTX_ACT_OK;
return ret;
}
#ifdef ENABLE_DSR
#if DSR_ENCAP_MODE == DSR_ENCAP_IPIP
static __always_inline void rss_gen_src6(union v6addr *src,
const union v6addr *client,
__be32 l4_hint)
{
__u32 bits = 128 - IPV6_RSS_PREFIX_BITS;
*src = (union v6addr)IPV6_RSS_PREFIX;
if (bits) {
__u32 todo;
if (bits > 96) {
todo = bits - 96;
src->p1 |= bpf_htonl(hash_32(client->p1 ^ l4_hint, todo));
bits -= todo;
}
if (bits > 64) {
todo = bits - 64;
src->p2 |= bpf_htonl(hash_32(client->p2 ^ l4_hint, todo));
bits -= todo;
}
if (bits > 32) {
todo = bits - 32;
src->p3 |= bpf_htonl(hash_32(client->p3 ^ l4_hint, todo));
bits -= todo;
}
src->p4 |= bpf_htonl(hash_32(client->p4 ^ l4_hint, bits));
}
}
static __always_inline int dsr_set_ipip6(struct __ctx_buff *ctx,
const struct ipv6hdr *ip6,
union v6addr *backend_addr,
__be32 l4_hint, int *ohead)
{
__u16 payload_len = bpf_ntohs(ip6->payload_len) + sizeof(*ip6);
const int l3_off = ETH_HLEN;
union v6addr saddr;
struct {
__be16 payload_len;
__u8 nexthdr;
__u8 hop_limit;
} tp_new = {
.payload_len = bpf_htons(payload_len),
.nexthdr = IPPROTO_IPV6,
.hop_limit = IPDEFTTL,
};
if (dsr_is_too_big(ctx, payload_len + sizeof(*ip6))) {
*ohead = sizeof(*ip6);
return DROP_FRAG_NEEDED;
}
rss_gen_src6(&saddr, (union v6addr *)&ip6->saddr, l4_hint);
if (ctx_adjust_hroom(ctx, sizeof(*ip6), BPF_ADJ_ROOM_NET,
ctx_adjust_hroom_dsr_flags()))
return DROP_INVALID;
if (ctx_store_bytes(ctx, l3_off + offsetof(struct ipv6hdr, payload_len),
&tp_new.payload_len, 4, 0) < 0)
return DROP_WRITE_ERROR;
if (ctx_store_bytes(ctx, l3_off + offsetof(struct ipv6hdr, daddr),
backend_addr, sizeof(ip6->daddr), 0) < 0)
return DROP_WRITE_ERROR;
if (ctx_store_bytes(ctx, l3_off + offsetof(struct ipv6hdr, saddr),
&saddr, sizeof(ip6->saddr), 0) < 0)
return DROP_WRITE_ERROR;
return 0;
}
#elif DSR_ENCAP_MODE == DSR_ENCAP_NONE
static __always_inline int dsr_set_ext6(struct __ctx_buff *ctx,
struct ipv6hdr *ip6,
union v6addr *svc_addr,
__be32 svc_port, int *ohead)
{
struct dsr_opt_v6 opt __align_stack_8 = {};
__u16 payload_len = bpf_ntohs(ip6->payload_len) + sizeof(opt);
if (dsr_is_too_big(ctx, payload_len)) {
*ohead = sizeof(opt);
return DROP_FRAG_NEEDED;
}
opt.nexthdr = ip6->nexthdr;
ip6->nexthdr = NEXTHDR_DEST;
ip6->payload_len = bpf_htons(payload_len);
opt.len = DSR_IPV6_EXT_LEN;
opt.opt_type = DSR_IPV6_OPT_TYPE;
opt.opt_len = DSR_IPV6_OPT_LEN;
ipv6_addr_copy(&opt.addr, svc_addr);
opt.port = svc_port;
if (ctx_adjust_hroom(ctx, sizeof(opt), BPF_ADJ_ROOM_NET,
ctx_adjust_hroom_dsr_flags()))
return DROP_INVALID;
if (ctx_store_bytes(ctx, ETH_HLEN + sizeof(*ip6), &opt,
sizeof(opt), 0) < 0)
return DROP_INVALID;
return 0;
}
#endif /* DSR_ENCAP_MODE */
static __always_inline int find_dsr_v6(struct __ctx_buff *ctx, __u8 nexthdr,
struct dsr_opt_v6 *dsr_opt, bool *found)
{
struct ipv6_opt_hdr opthdr __align_stack_8;
int i, len = sizeof(struct ipv6hdr);
__u8 nh = nexthdr;
#pragma unroll
for (i = 0; i < IPV6_MAX_HEADERS; i++) {
switch (nh) {
case NEXTHDR_NONE:
return DROP_INVALID_EXTHDR;
case NEXTHDR_FRAGMENT:
return DROP_FRAG_NOSUPPORT;
case NEXTHDR_HOP:
case NEXTHDR_ROUTING:
case NEXTHDR_AUTH:
case NEXTHDR_DEST:
if (ctx_load_bytes(ctx, ETH_HLEN + len, &opthdr, sizeof(opthdr)) < 0)
return DROP_INVALID;
if (nh == NEXTHDR_DEST && opthdr.hdrlen == DSR_IPV6_EXT_LEN) {
if (ctx_load_bytes(ctx, ETH_HLEN + len, dsr_opt,
sizeof(*dsr_opt)) < 0)
return DROP_INVALID;
if (dsr_opt->opt_type == DSR_IPV6_OPT_TYPE &&
dsr_opt->opt_len == DSR_IPV6_OPT_LEN) {
*found = true;
return 0;
}
}
nh = opthdr.nexthdr;
if (nh == NEXTHDR_AUTH)
len += ipv6_authlen(&opthdr);
else
len += ipv6_optlen(&opthdr);
break;
default:
return 0;
}
}
/* Reached limit of supported extension headers */
return DROP_INVALID_EXTHDR;
}
static __always_inline int handle_dsr_v6(struct __ctx_buff *ctx, bool *dsr)
{
struct dsr_opt_v6 opt __align_stack_8 = {};
void *data, *data_end;
struct ipv6hdr *ip6;
int ret;
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return DROP_INVALID;
ret = find_dsr_v6(ctx, ip6->nexthdr, &opt, dsr);
if (ret != 0)
return ret;
if (*dsr) {
if (snat_v6_create_dsr(ctx, &opt.addr, opt.port) < 0)
return DROP_INVALID;
}
return 0;
}
static __always_inline int xlate_dsr_v6(struct __ctx_buff *ctx,
const struct ipv6_ct_tuple *tuple,
int l4_off)
{
struct ipv6_ct_tuple nat_tup = *tuple;
struct ipv6_nat_entry *entry;
int ret = 0;
nat_tup.flags = NAT_DIR_EGRESS;
nat_tup.sport = tuple->dport;
nat_tup.dport = tuple->sport;
entry = snat_v6_lookup(&nat_tup);
if (entry)
ret = snat_v6_rewrite_egress(ctx, &nat_tup, entry, l4_off);
return ret;
}
static __always_inline int dsr_reply_icmp6(struct __ctx_buff *ctx,
struct ipv6hdr *ip6 __maybe_unused,
int code, int ohead __maybe_unused)
{
#ifdef ENABLE_DSR_ICMP_ERRORS
const __s32 orig_dgram = 64, off = ETH_HLEN;
const __u32 l3_max = sizeof(*ip6) + orig_dgram;
__be16 type = bpf_htons(ETH_P_IPV6);
__u64 len_new = off + sizeof(*ip6) + orig_dgram;
__u64 len_old = ctx_full_len(ctx);
void *data_end = ctx_data_end(ctx);
void *data = ctx_data(ctx);
__wsum wsum;
union macaddr smac, dmac;
struct icmp6hdr icmp __align_stack_8 = {
.icmp6_type = ICMPV6_PKT_TOOBIG,
.icmp6_mtu = bpf_htonl(THIS_MTU - ohead),
};
struct ipv6hdr ip __align_stack_8 = {
.version = 6,
.priority = ip6->priority,
.flow_lbl[0] = ip6->flow_lbl[0],
.flow_lbl[1] = ip6->flow_lbl[1],
.flow_lbl[2] = ip6->flow_lbl[2],
.nexthdr = IPPROTO_ICMPV6,
.hop_limit = IPDEFTTL,
.saddr = ip6->daddr,
.daddr = ip6->saddr,
.payload_len = bpf_htons(sizeof(icmp) + len_new - off),
};
update_metrics(ctx_full_len(ctx), METRIC_EGRESS, -code);
if (eth_load_saddr(ctx, smac.addr, 0) < 0)
goto drop_err;
if (eth_load_daddr(ctx, dmac.addr, 0) < 0)
goto drop_err;
if (unlikely(data + len_new > data_end))
goto drop_err;
wsum = ipv6_pseudohdr_checksum(&ip, IPPROTO_ICMPV6,
bpf_ntohs(ip.payload_len), 0);
icmp.icmp6_cksum = csum_fold(csum_diff(NULL, 0, data + off, l3_max,
csum_diff(NULL, 0, &icmp,
sizeof(icmp), wsum)));
if (ctx_adjust_troom(ctx, -(len_old - len_new)) < 0)
goto drop_err;
if (ctx_adjust_hroom(ctx, sizeof(ip) + sizeof(icmp),
BPF_ADJ_ROOM_NET,
ctx_adjust_hroom_dsr_flags()) < 0)
goto drop_err;
if (eth_store_daddr(ctx, smac.addr, 0) < 0)
goto drop_err;
if (eth_store_saddr(ctx, dmac.addr, 0) < 0)
goto drop_err;
if (ctx_store_bytes(ctx, ETH_ALEN * 2, &type, sizeof(type), 0) < 0)
goto drop_err;
if (ctx_store_bytes(ctx, off, &ip, sizeof(ip), 0) < 0)
goto drop_err;
if (ctx_store_bytes(ctx, off + sizeof(ip), &icmp,
sizeof(icmp), 0) < 0)
goto drop_err;
return ctx_redirect(ctx, ctx_get_ifindex(ctx), 0);
drop_err:
#endif
return send_drop_notify_error(ctx, 0, code, CTX_ACT_DROP,
METRIC_EGRESS);
}
__section_tail(CILIUM_MAP_CALLS, CILIUM_CALL_IPV6_NODEPORT_DSR)
int tail_nodeport_ipv6_dsr(struct __ctx_buff *ctx)
{
struct bpf_fib_lookup_padded fib_params = {
.l = {
.family = AF_INET6,
.ifindex = DIRECT_ROUTING_DEV_IFINDEX,
},
};
union macaddr *dmac = NULL;
void *data, *data_end;
struct ipv6hdr *ip6;
union v6addr addr;
int ret, ohead = 0;
bool l2_hdr_required = true;
if (!revalidate_data(ctx, &data, &data_end, &ip6)) {
ret = DROP_INVALID;
goto drop_err;
}
addr.p1 = ctx_load_meta(ctx, CB_ADDR_V6_1);
addr.p2 = ctx_load_meta(ctx, CB_ADDR_V6_2);
addr.p3 = ctx_load_meta(ctx, CB_ADDR_V6_3);
addr.p4 = ctx_load_meta(ctx, CB_ADDR_V6_4);
#if DSR_ENCAP_MODE == DSR_ENCAP_IPIP
ret = dsr_set_ipip6(ctx, ip6, &addr,
ctx_load_meta(ctx, CB_HINT), &ohead);
#elif DSR_ENCAP_MODE == DSR_ENCAP_NONE
ret = dsr_set_ext6(ctx, ip6, &addr,
ctx_load_meta(ctx, CB_PORT), &ohead);
#else
# error "Invalid load balancer DSR encapsulation mode!"
#endif
if (unlikely(ret)) {
if (dsr_fail_needs_reply(ret))
return dsr_reply_icmp6(ctx, ip6, ret, ohead);
goto drop_err;
}
if (!revalidate_data(ctx, &data, &data_end, &ip6)) {
ret = DROP_INVALID;
goto drop_err;
}
ret = maybe_add_l2_hdr(ctx, DIRECT_ROUTING_DEV_IFINDEX,
&l2_hdr_required);
if (ret != 0)
goto drop_err;
if (!l2_hdr_required)
goto out_send;
else if (!revalidate_data_with_eth_hlen(ctx, &data, &data_end, &ip6,
__ETH_HLEN))
return DROP_INVALID;
if (nodeport_lb_hairpin())
dmac = map_lookup_elem(&NODEPORT_NEIGH6, &ip6->daddr);
if (dmac) {
union macaddr mac = NATIVE_DEV_MAC_BY_IFINDEX(fib_params.l.ifindex);
if (eth_store_daddr_aligned(ctx, dmac->addr, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
if (eth_store_saddr_aligned(ctx, mac.addr, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
} else {
ipv6_addr_copy((union v6addr *) &fib_params.l.ipv6_src,
(union v6addr *) &ip6->saddr);
ipv6_addr_copy((union v6addr *) &fib_params.l.ipv6_dst,
(union v6addr *) &ip6->daddr);
ret = fib_lookup(ctx, &fib_params.l, sizeof(fib_params),
BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT);
if (ret != 0) {
ret = DROP_NO_FIB;
goto drop_err;
}
if (nodeport_lb_hairpin())
map_update_elem(&NODEPORT_NEIGH6, &ip6->daddr,
fib_params.l.dmac, 0);
if (eth_store_daddr(ctx, fib_params.l.dmac, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
if (eth_store_saddr(ctx, fib_params.l.smac, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
}
out_send:
cilium_capture_out(ctx);
return ctx_redirect(ctx, fib_params.l.ifindex, 0);
drop_err:
return send_drop_notify_error(ctx, 0, ret, CTX_ACT_DROP, METRIC_EGRESS);
}
#endif /* ENABLE_DSR */
__section_tail(CILIUM_MAP_CALLS, CILIUM_CALL_IPV6_NODEPORT_NAT)
int tail_nodeport_nat_ipv6(struct __ctx_buff *ctx)
{
int ret, dir = ctx_load_meta(ctx, CB_NAT);
union v6addr tmp = IPV6_DIRECT_ROUTING;
struct bpf_fib_lookup_padded fib_params = {
.l = {
.family = AF_INET6,
.ifindex = DIRECT_ROUTING_DEV_IFINDEX,
},
};
struct ipv6_nat_target target = {
.min_port = NODEPORT_PORT_MIN_NAT,
.max_port = NODEPORT_PORT_MAX_NAT,
.src_from_world = true,
};
union macaddr *dmac = NULL;
void *data, *data_end;
struct ipv6hdr *ip6;
bool l2_hdr_required = true;
target.addr = tmp;
#ifdef TUNNEL_MODE
if (dir == NAT_DIR_EGRESS) {
struct remote_endpoint_info *info;
union v6addr *dst;
if (!revalidate_data(ctx, &data, &data_end, &ip6)) {
ret = DROP_INVALID;
goto drop_err;
}
dst = (union v6addr *)&ip6->daddr;
info = ipcache_lookup6(&IPCACHE_MAP, dst, V6_CACHE_KEY_LEN);
if (info != NULL && info->tunnel_endpoint != 0) {
ret = __encap_with_nodeid(ctx, info->tunnel_endpoint,
SECLABEL, TRACE_PAYLOAD_LEN);
if (ret)
goto drop_err;
BPF_V6(target.addr, ROUTER_IP);
fib_params.l.ifindex = ENCAP_IFINDEX;
/* fib lookup not necessary when going over tunnel. */
if (eth_store_daddr(ctx, fib_params.l.dmac, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
if (eth_store_saddr(ctx, fib_params.l.smac, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
}
}
#endif
ret = snat_v6_process(ctx, dir, &target);
if (IS_ERR(ret)) {
/* In case of no mapping, recircle back to main path. SNAT is very
* expensive in terms of instructions (since we don't have BPF to
* BPF calls as we use tail calls) and complexity, hence this is
* done inside a tail call here.
*/
if (dir == NAT_DIR_INGRESS) {
bpf_skip_nodeport_set(ctx);
ep_tail_call(ctx, CILIUM_CALL_IPV6_FROM_LXC);
ret = DROP_MISSED_TAIL_CALL;
goto drop_err;
}
if (ret != NAT_PUNT_TO_STACK)
goto drop_err;
}
bpf_mark_snat_done(ctx);
if (dir == NAT_DIR_INGRESS) {
ep_tail_call(ctx, CILIUM_CALL_IPV6_NODEPORT_REVNAT);
ret = DROP_MISSED_TAIL_CALL;
goto drop_err;
}
#ifdef TUNNEL_MODE
if (fib_params.l.ifindex == ENCAP_IFINDEX)
goto out_send;
#endif
if (!revalidate_data(ctx, &data, &data_end, &ip6)) {
ret = DROP_INVALID;
goto drop_err;
}
ret = maybe_add_l2_hdr(ctx, DIRECT_ROUTING_DEV_IFINDEX,
&l2_hdr_required);
if (ret != 0)
goto drop_err;
if (!l2_hdr_required)
goto out_send;
else if (!revalidate_data_with_eth_hlen(ctx, &data, &data_end, &ip6,
__ETH_HLEN))
return DROP_INVALID;
if (nodeport_lb_hairpin())
dmac = map_lookup_elem(&NODEPORT_NEIGH6, &ip6->daddr);
if (dmac) {
union macaddr mac = NATIVE_DEV_MAC_BY_IFINDEX(fib_params.l.ifindex);
if (eth_store_daddr_aligned(ctx, dmac->addr, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
if (eth_store_saddr_aligned(ctx, mac.addr, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
} else {
ipv6_addr_copy((union v6addr *) &fib_params.l.ipv6_src,
(union v6addr *) &ip6->saddr);
ipv6_addr_copy((union v6addr *) &fib_params.l.ipv6_dst,
(union v6addr *) &ip6->daddr);
ret = fib_lookup(ctx, &fib_params.l, sizeof(fib_params),
BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT);
if (ret != 0) {
ret = DROP_NO_FIB;
goto drop_err;
}
if (nodeport_lb_hairpin())
map_update_elem(&NODEPORT_NEIGH6, &ip6->daddr,
fib_params.l.dmac, 0);
if (eth_store_daddr(ctx, fib_params.l.dmac, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
if (eth_store_saddr(ctx, fib_params.l.smac, 0) < 0) {
ret = DROP_WRITE_ERROR;
goto drop_err;
}
}
out_send:
cilium_capture_out(ctx);
return ctx_redirect(ctx, fib_params.l.ifindex, 0);
drop_err:
return send_drop_notify_error(ctx, 0, ret, CTX_ACT_DROP,
dir == NAT_DIR_INGRESS ?
METRIC_INGRESS : METRIC_EGRESS);
}
/* See nodeport_lb4(). */
static __always_inline int nodeport_lb6(struct __ctx_buff *ctx,
__u32 src_identity)
{
int ret, l3_off = ETH_HLEN, l4_off, hdrlen;
struct ipv6_ct_tuple tuple = {};
void *data, *data_end;
struct ipv6hdr *ip6;
struct csum_offset csum_off = {};
struct lb6_service *svc;
struct lb6_key key = {};
struct ct_state ct_state_new = {};
union macaddr smac, *mac;
bool backend_local;
__u32 monitor = 0;
cilium_capture_in(ctx);
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return DROP_INVALID;
tuple.nexthdr = ip6->nexthdr;
ipv6_addr_copy(&tuple.daddr, (union v6addr *) &ip6->daddr);
ipv6_addr_copy(&tuple.saddr, (union v6addr *) &ip6->saddr);
hdrlen = ipv6_hdrlen(ctx, l3_off, &tuple.nexthdr);
if (hdrlen < 0)
return hdrlen;
l4_off = l3_off + hdrlen;
ret = lb6_extract_key(ctx, &tuple, l4_off, &key, &csum_off, CT_EGRESS);
if (IS_ERR(ret)) {
if (ret == DROP_NO_SERVICE)
goto skip_service_lookup;
else if (ret == DROP_UNKNOWN_L4)
return CTX_ACT_OK;
else
return ret;
}
svc = lb6_lookup_service(&key, false);
if (svc) {
const bool skip_l3_xlate = DSR_ENCAP_MODE == DSR_ENCAP_IPIP;
if (!lb6_src_range_ok(svc, (union v6addr *)&ip6->saddr))
return DROP_NOT_IN_SRC_RANGE;
ret = lb6_local(get_ct_map6(&tuple), ctx, l3_off, l4_off,
&csum_off, &key, &tuple, svc, &ct_state_new,
skip_l3_xlate);
if (IS_ERR(ret))
return ret;
}
if (!svc || !lb6_svc_is_routable(svc)) {
if (svc)
return DROP_IS_CLUSTER_IP;
skip_service_lookup:
ctx_set_xfer(ctx, XFER_PKT_NO_SVC);
if (nodeport_uses_dsr6(&tuple))
return CTX_ACT_OK;
ctx_store_meta(ctx, CB_NAT, NAT_DIR_INGRESS);
ctx_store_meta(ctx, CB_SRC_IDENTITY, src_identity);
ep_tail_call(ctx, CILIUM_CALL_IPV6_NODEPORT_NAT);
return DROP_MISSED_TAIL_CALL;
}
backend_local = __lookup_ip6_endpoint(&tuple.daddr);
if (!backend_local && lb6_svc_is_hostport(svc))
return DROP_INVALID;
if (backend_local || !nodeport_uses_dsr6(&tuple)) {
struct ct_state ct_state = {};
ret = ct_lookup6(get_ct_map6(&tuple), &tuple, ctx, l4_off,
CT_EGRESS, &ct_state, &monitor);
switch (ret) {
case CT_NEW:
redo_all:
ct_state_new.src_sec_id = SECLABEL;
ct_state_new.node_port = 1;
ct_state_new.ifindex = NATIVE_DEV_IFINDEX;
ret = ct_create6(get_ct_map6(&tuple), NULL, &tuple, ctx,
CT_EGRESS, &ct_state_new, false);
if (IS_ERR(ret))
return ret;
if (backend_local) {
ct_flip_tuple_dir6(&tuple);
redo_local:
ct_state_new.rev_nat_index = 0;
ret = ct_create6(get_ct_map6(&tuple), NULL,
&tuple, ctx, CT_INGRESS,
&ct_state_new, false);
if (IS_ERR(ret))
return ret;
}
break;
case CT_REOPENED:
case CT_ESTABLISHED:
case CT_REPLY:
if (unlikely(ct_state.rev_nat_index !=
svc->rev_nat_index))
goto redo_all;
if (backend_local) {
ct_flip_tuple_dir6(&tuple);
if (!__ct_entry_keep_alive(get_ct_map6(&tuple),
&tuple)) {
ct_state_new.src_sec_id = SECLABEL;
ct_state_new.node_port = 1;
ct_state_new.ifindex = NATIVE_DEV_IFINDEX;
goto redo_local;
}
}
break;
default:
return DROP_UNKNOWN_CT;
}
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return DROP_INVALID;
if (eth_load_saddr(ctx, smac.addr, 0) < 0)
return DROP_INVALID;
mac = map_lookup_elem(&NODEPORT_NEIGH6, &ip6->saddr);
if (!mac || eth_addrcmp(mac, &smac)) {
ret = map_update_elem(&NODEPORT_NEIGH6, &ip6->saddr,
&smac, 0);
if (ret < 0)
return ret;
}
}
if (!backend_local) {
edt_set_aggregate(ctx, 0);
if (nodeport_uses_dsr6(&tuple)) {
#if DSR_ENCAP_MODE == DSR_ENCAP_IPIP
ctx_store_meta(ctx, CB_HINT,
((__u32)tuple.sport << 16) | tuple.dport);
ctx_store_meta(ctx, CB_ADDR_V6_1, tuple.daddr.p1);
ctx_store_meta(ctx, CB_ADDR_V6_2, tuple.daddr.p2);
ctx_store_meta(ctx, CB_ADDR_V6_3, tuple.daddr.p3);
ctx_store_meta(ctx, CB_ADDR_V6_4, tuple.daddr.p4);
#elif DSR_ENCAP_MODE == DSR_ENCAP_NONE
ctx_store_meta(ctx, CB_PORT, key.dport);
ctx_store_meta(ctx, CB_ADDR_V6_1, key.address.p1);
ctx_store_meta(ctx, CB_ADDR_V6_2, key.address.p2);
ctx_store_meta(ctx, CB_ADDR_V6_3, key.address.p3);
ctx_store_meta(ctx, CB_ADDR_V6_4, key.address.p4);
#endif /* DSR_ENCAP_MODE */
ep_tail_call(ctx, CILIUM_CALL_IPV6_NODEPORT_DSR);
} else {
ctx_store_meta(ctx, CB_NAT, NAT_DIR_EGRESS);
ep_tail_call(ctx, CILIUM_CALL_IPV6_NODEPORT_NAT);
}
return DROP_MISSED_TAIL_CALL;
}
ctx_set_xfer(ctx, XFER_PKT_NO_SVC);
return CTX_ACT_OK;
}
/* See comment in tail_rev_nodeport_lb4(). */
static __always_inline int rev_nodeport_lb6(struct __ctx_buff *ctx, int *ifindex,
const bool rev_dnat_at_netdev)
{
int ret, ret2, l3_off = ETH_HLEN, l4_off, hdrlen;
struct ipv6_ct_tuple tuple = {};
void *data, *data_end;
struct ipv6hdr *ip6;
struct csum_offset csum_off = {};
struct ct_state ct_state = {};
struct bpf_fib_lookup fib_params = {};
union macaddr *dmac = NULL;
__u32 monitor = 0;
bool l2_hdr_required = true;
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return DROP_INVALID;
tuple.nexthdr = ip6->nexthdr;
ipv6_addr_copy(&tuple.daddr, (union v6addr *) &ip6->daddr);
ipv6_addr_copy(&tuple.saddr, (union v6addr *) &ip6->saddr);
hdrlen = ipv6_hdrlen(ctx, l3_off, &tuple.nexthdr);
if (hdrlen < 0)
return hdrlen;
l4_off = l3_off + hdrlen;
csum_l4_offset_and_flags(tuple.nexthdr, &csum_off);
ret = ct_lookup6(get_ct_map6(&tuple), &tuple, ctx, l4_off, CT_INGRESS, &ct_state,
&monitor);
/* See ipv4 equivalent for details */
if (rev_dnat_at_netdev && !ct_state.node_port)
return CTX_ACT_OK;
if (ret == CT_REPLY && ct_state.node_port == 1 && ct_state.rev_nat_index != 0) {
ret2 = lb6_rev_nat(ctx, l4_off, &csum_off, ct_state.rev_nat_index,
&tuple, REV_NAT_F_TUPLE_SADDR);
if (IS_ERR(ret2))
return ret2;
if (!revalidate_data(ctx, &data, &data_end, &ip6))
return DROP_INVALID;
bpf_mark_snat_done(ctx);
*ifindex = ct_state.ifindex;
#ifdef TUNNEL_MODE
{
union v6addr *dst = (union v6addr *)&ip6->daddr;
struct remote_endpoint_info *info;
info = ipcache_lookup6(&IPCACHE_MAP, dst, V6_CACHE_KEY_LEN);
if (info != NULL && info->tunnel_endpoint != 0) {
ret = __encap_with_nodeid(ctx, info->tunnel_endpoint,
SECLABEL, TRACE_PAYLOAD_LEN);
if (ret)
return ret;
*ifindex = ENCAP_IFINDEX;
/* fib lookup not necessary when going over tunnel. */
if (eth_store_daddr(ctx, fib_params.dmac, 0) < 0)
return DROP_WRITE_ERROR;
if (eth_store_saddr(ctx, fib_params.smac, 0) < 0)
return DROP_WRITE_ERROR;
return CTX_ACT_OK;
}
}
#endif
ret = maybe_add_l2_hdr(ctx, *ifindex, &l2_hdr_required);
if (ret != 0)
return ret;
if (!l2_hdr_required)
return CTX_ACT_OK;
else if (!revalidate_data_with_eth_hlen(ctx, &data, &data_end,
&ip6, __ETH_HLEN))