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Date: Thu, 15 Oct 2020 17:46:49 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Daniel Borkmann <daniel@...earbox.net>
Cc: David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
bpf@...r.kernel.org
Subject: [PATCH RFC bpf-next 2/2] selftests: Update test_tc_neigh to use the
modified bpf_redirect_neigh()
From: Toke Høiland-Jørgensen <toke@...hat.com>
This updates the test_tc_neigh selftest to use the new syntax of
bpf_redirect_neigh(). To exercise the helper both with and without the
optional parameter, one forwarding direction is changed to do a
bpf_fib_lookup() followed by a call to bpf_redirect_neigh(), while the
other direction is using the map-based ifindex lookup letting the redirect
helper resolve the nexthop from the FIB.
This also fixes the test_tc_redirect.sh script to work on systems that have
a consolidated dual-stack 'ping' binary instead of separate ping/ping6
versions.
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
tools/testing/selftests/bpf/progs/test_tc_neigh.c | 83 ++++++++++++++++++---
tools/testing/selftests/bpf/test_tc_redirect.sh | 8 +-
2 files changed, 78 insertions(+), 13 deletions(-)
diff --git a/tools/testing/selftests/bpf/progs/test_tc_neigh.c b/tools/testing/selftests/bpf/progs/test_tc_neigh.c
index fe182616b112..ba03e603ba9b 100644
--- a/tools/testing/selftests/bpf/progs/test_tc_neigh.c
+++ b/tools/testing/selftests/bpf/progs/test_tc_neigh.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <stdint.h>
#include <stdbool.h>
+#include <stddef.h>
#include <linux/bpf.h>
#include <linux/stddef.h>
@@ -32,6 +33,9 @@
a.s6_addr32[3] == b.s6_addr32[3])
#endif
+#define AF_INET 2
+#define AF_INET6 10
+
enum {
dev_src,
dev_dst,
@@ -45,7 +49,8 @@ struct bpf_map_def SEC("maps") ifindex_map = {
};
static __always_inline bool is_remote_ep_v4(struct __sk_buff *skb,
- __be32 addr)
+ __be32 addr,
+ struct bpf_fib_lookup *fib_params)
{
void *data_end = ctx_ptr(skb->data_end);
void *data = ctx_ptr(skb->data);
@@ -58,11 +63,26 @@ static __always_inline bool is_remote_ep_v4(struct __sk_buff *skb,
if ((void *)(ip4h + 1) > data_end)
return false;
- return ip4h->daddr == addr;
+ if (ip4h->daddr != addr)
+ return false;
+
+ if (fib_params) {
+ fib_params->family = AF_INET;
+ fib_params->tos = ip4h->tos;
+ fib_params->l4_protocol = ip4h->protocol;
+ fib_params->sport = 0;
+ fib_params->dport = 0;
+ fib_params->tot_len = bpf_ntohs(ip4h->tot_len);
+ fib_params->ipv4_src = ip4h->saddr;
+ fib_params->ipv4_dst = ip4h->daddr;
+ }
+
+ return true;
}
static __always_inline bool is_remote_ep_v6(struct __sk_buff *skb,
- struct in6_addr addr)
+ struct in6_addr addr,
+ struct bpf_fib_lookup *fib_params)
{
void *data_end = ctx_ptr(skb->data_end);
void *data = ctx_ptr(skb->data);
@@ -75,7 +95,24 @@ static __always_inline bool is_remote_ep_v6(struct __sk_buff *skb,
if ((void *)(ip6h + 1) > data_end)
return false;
- return v6_equal(ip6h->daddr, addr);
+ if (!v6_equal(ip6h->daddr, addr))
+ return false;
+
+ if (fib_params) {
+ struct in6_addr *src = (struct in6_addr *)fib_params->ipv6_src;
+ struct in6_addr *dst = (struct in6_addr *)fib_params->ipv6_dst;
+
+ fib_params->family = AF_INET6;
+ fib_params->flowinfo = 0;
+ fib_params->l4_protocol = ip6h->nexthdr;
+ fib_params->sport = 0;
+ fib_params->dport = 0;
+ fib_params->tot_len = bpf_ntohs(ip6h->payload_len);
+ *src = ip6h->saddr;
+ *dst = ip6h->daddr;
+ }
+
+ return true;
}
static __always_inline int get_dev_ifindex(int which)
@@ -99,15 +136,17 @@ SEC("chk_egress") int tc_chk(struct __sk_buff *skb)
SEC("dst_ingress") int tc_dst(struct __sk_buff *skb)
{
+ struct bpf_fib_lookup fib_params = { .ifindex = skb->ingress_ifindex };
__u8 zero[ETH_ALEN * 2];
bool redirect = false;
+ int ret;
switch (skb->protocol) {
case __bpf_constant_htons(ETH_P_IP):
- redirect = is_remote_ep_v4(skb, __bpf_constant_htonl(ip4_src));
+ redirect = is_remote_ep_v4(skb, __bpf_constant_htonl(ip4_src), &fib_params);
break;
case __bpf_constant_htons(ETH_P_IPV6):
- redirect = is_remote_ep_v6(skb, (struct in6_addr)ip6_src);
+ redirect = is_remote_ep_v6(skb, (struct in6_addr)ip6_src, &fib_params);
break;
}
@@ -118,7 +157,31 @@ SEC("dst_ingress") int tc_dst(struct __sk_buff *skb)
if (bpf_skb_store_bytes(skb, 0, &zero, sizeof(zero), 0) < 0)
return TC_ACT_SHOT;
- return bpf_redirect_neigh(get_dev_ifindex(dev_src), 0);
+ ret = bpf_fib_lookup(skb, &fib_params, sizeof(fib_params), 0);
+ bpf_printk("bpf_fib_lookup() ret: %d\n", ret);
+ if (ret == BPF_FIB_LKUP_RET_SUCCESS) {
+ void *data_end = ctx_ptr(skb->data_end);
+ struct ethhdr *eth = ctx_ptr(skb->data);
+
+ if (eth + 1 > data_end)
+ return TC_ACT_SHOT;
+
+ __builtin_memcpy(eth->h_dest, fib_params.dmac, ETH_ALEN);
+ __builtin_memcpy(eth->h_source, fib_params.smac, ETH_ALEN);
+
+ return bpf_redirect(fib_params.ifindex, 0);
+
+ } else if (ret == BPF_FIB_LKUP_RET_NO_NEIGH) {
+ struct bpf_redir_neigh nh_params = {};
+
+ nh_params.nh_family = fib_params.family;
+ __builtin_memcpy(&nh_params.ipv6_nh, &fib_params.ipv6_dst,
+ sizeof(nh_params.ipv6_nh));
+
+ return bpf_redirect_neigh(fib_params.ifindex, &nh_params,
+ sizeof(nh_params), 0);
+ }
+ return TC_ACT_SHOT;
}
SEC("src_ingress") int tc_src(struct __sk_buff *skb)
@@ -128,10 +191,10 @@ SEC("src_ingress") int tc_src(struct __sk_buff *skb)
switch (skb->protocol) {
case __bpf_constant_htons(ETH_P_IP):
- redirect = is_remote_ep_v4(skb, __bpf_constant_htonl(ip4_dst));
+ redirect = is_remote_ep_v4(skb, __bpf_constant_htonl(ip4_dst), NULL);
break;
case __bpf_constant_htons(ETH_P_IPV6):
- redirect = is_remote_ep_v6(skb, (struct in6_addr)ip6_dst);
+ redirect = is_remote_ep_v6(skb, (struct in6_addr)ip6_dst, NULL);
break;
}
@@ -142,7 +205,7 @@ SEC("src_ingress") int tc_src(struct __sk_buff *skb)
if (bpf_skb_store_bytes(skb, 0, &zero, sizeof(zero), 0) < 0)
return TC_ACT_SHOT;
- return bpf_redirect_neigh(get_dev_ifindex(dev_dst), 0);
+ return bpf_redirect_neigh(get_dev_ifindex(dev_dst), NULL, 0, 0);
}
char __license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/test_tc_redirect.sh b/tools/testing/selftests/bpf/test_tc_redirect.sh
index 6d7482562140..09b20f24d018 100755
--- a/tools/testing/selftests/bpf/test_tc_redirect.sh
+++ b/tools/testing/selftests/bpf/test_tc_redirect.sh
@@ -24,8 +24,7 @@ command -v timeout >/dev/null 2>&1 || \
{ echo >&2 "timeout is not available"; exit 1; }
command -v ping >/dev/null 2>&1 || \
{ echo >&2 "ping is not available"; exit 1; }
-command -v ping6 >/dev/null 2>&1 || \
- { echo >&2 "ping6 is not available"; exit 1; }
+if command -v ping6 >/dev/null 2>&1; then PING6=ping6; else PING6=ping; fi
command -v perl >/dev/null 2>&1 || \
{ echo >&2 "perl is not available"; exit 1; }
command -v jq >/dev/null 2>&1 || \
@@ -152,7 +151,7 @@ netns_test_connectivity()
echo -e "${TEST}: ${GREEN}PASS${NC}"
TEST="ICMPv6 connectivity test"
- ip netns exec ${NS_SRC} ping6 $PING_ARG ${IP6_DST}
+ ip netns exec ${NS_SRC} $PING6 $PING_ARG ${IP6_DST}
if [ $? -ne 0 ]; then
echo -e "${TEST}: ${RED}FAIL${NC}"
exit 1
@@ -179,6 +178,9 @@ netns_setup_bpf()
ip netns exec ${NS_FWD} tc filter add dev veth_dst_fwd ingress bpf da obj $obj sec dst_ingress
ip netns exec ${NS_FWD} tc filter add dev veth_dst_fwd egress bpf da obj $obj sec chk_egress
+ # bpf_fib_lookup() checks if forwarding is enabled
+ ip netns exec ${NS_FWD} sysctl -w net.ipv4.ip_forward=1 net.ipv6.conf.veth_dst_fwd.forwarding=1
+
veth_src=$(ip netns exec ${NS_FWD} cat /sys/class/net/veth_src_fwd/ifindex)
veth_dst=$(ip netns exec ${NS_FWD} cat /sys/class/net/veth_dst_fwd/ifindex)
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