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authorThomas Graf <tgraf@suug.ch>2016-11-30 17:10:11 +0100
committerDavid S. Miller <davem@davemloft.net>2016-12-02 10:52:00 -0500
commitf74599f7c5309b21151233b98139e9b723fd1110 (patch)
treeac7fa7fac909e55054a01ade7d924c94fe7ab402
parent3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 (diff)
bpf: Add tests and samples for LWT-BPF
Adds a series of tests to verify the functionality of attaching BPF programs at LWT hooks. Also adds a sample which collects a histogram of packet sizes which pass through an LWT hook. $ ./lwt_len_hist.sh Starting netserver with host 'IN(6)ADDR_ANY' port '12865' and family AF_UNSPEC MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.253.2 () port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 39857.69 1 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 22 | | 64 -> 127 : 98 | | 128 -> 255 : 213 | | 256 -> 511 : 1444251 |******** | 512 -> 1023 : 660610 |*** | 1024 -> 2047 : 535241 |** | 2048 -> 4095 : 19 | | 4096 -> 8191 : 180 | | 8192 -> 16383 : 5578023 |************************************* | 16384 -> 32767 : 632099 |*** | 32768 -> 65535 : 6575 | | Signed-off-by: Thomas Graf <tgraf@suug.ch> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--samples/bpf/Makefile4
-rw-r--r--samples/bpf/bpf_helpers.h4
-rw-r--r--samples/bpf/lwt_len_hist.sh37
-rw-r--r--samples/bpf/lwt_len_hist_kern.c82
-rw-r--r--samples/bpf/lwt_len_hist_user.c76
-rw-r--r--samples/bpf/test_lwt_bpf.c253
-rw-r--r--samples/bpf/test_lwt_bpf.sh399
7 files changed, 855 insertions, 0 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 3ceb5a9..44532fb 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -29,6 +29,7 @@ hostprogs-y += test_current_task_under_cgroup
hostprogs-y += trace_event
hostprogs-y += sampleip
hostprogs-y += tc_l2_redirect
+hostprogs-y += lwt_len_hist
test_lru_dist-objs := test_lru_dist.o libbpf.o
sock_example-objs := sock_example.o libbpf.o
@@ -59,6 +60,7 @@ test_current_task_under_cgroup-objs := bpf_load.o libbpf.o \
trace_event-objs := bpf_load.o libbpf.o trace_event_user.o
sampleip-objs := bpf_load.o libbpf.o sampleip_user.o
tc_l2_redirect-objs := bpf_load.o libbpf.o tc_l2_redirect_user.o
+lwt_len_hist-objs := bpf_load.o libbpf.o lwt_len_hist_user.o
# Tell kbuild to always build the programs
always := $(hostprogs-y)
@@ -89,6 +91,7 @@ always += xdp2_kern.o
always += test_current_task_under_cgroup_kern.o
always += trace_event_kern.o
always += sampleip_kern.o
+always += lwt_len_hist_kern.o
HOSTCFLAGS += -I$(objtree)/usr/include
HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
@@ -117,6 +120,7 @@ HOSTLOADLIBES_test_current_task_under_cgroup += -lelf
HOSTLOADLIBES_trace_event += -lelf
HOSTLOADLIBES_sampleip += -lelf
HOSTLOADLIBES_tc_l2_redirect += -l elf
+HOSTLOADLIBES_lwt_len_hist += -l elf
# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
diff --git a/samples/bpf/bpf_helpers.h b/samples/bpf/bpf_helpers.h
index 90f44bd..a246c61 100644
--- a/samples/bpf/bpf_helpers.h
+++ b/samples/bpf/bpf_helpers.h
@@ -80,6 +80,8 @@ struct bpf_map_def {
unsigned int map_flags;
};
+static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
+ (void *) BPF_FUNC_skb_load_bytes;
static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
(void *) BPF_FUNC_skb_store_bytes;
static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
@@ -88,6 +90,8 @@ static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flag
(void *) BPF_FUNC_l4_csum_replace;
static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
(void *) BPF_FUNC_skb_under_cgroup;
+static int (*bpf_skb_change_head)(void *, int len, int flags) =
+ (void *) BPF_FUNC_skb_change_head;
#if defined(__x86_64__)
diff --git a/samples/bpf/lwt_len_hist.sh b/samples/bpf/lwt_len_hist.sh
new file mode 100644
index 0000000..7d56774
--- /dev/null
+++ b/samples/bpf/lwt_len_hist.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+
+NS1=lwt_ns1
+VETH0=tst_lwt1a
+VETH1=tst_lwt1b
+
+TRACE_ROOT=/sys/kernel/debug/tracing
+
+function cleanup {
+ ip route del 192.168.253.2/32 dev $VETH0 2> /dev/null
+ ip link del $VETH0 2> /dev/null
+ ip link del $VETH1 2> /dev/null
+ ip netns exec $NS1 killall netserver
+ ip netns delete $NS1 2> /dev/null
+}
+
+cleanup
+
+ip netns add $NS1
+ip link add $VETH0 type veth peer name $VETH1
+ip link set dev $VETH0 up
+ip addr add 192.168.253.1/24 dev $VETH0
+ip link set $VETH1 netns $NS1
+ip netns exec $NS1 ip link set dev $VETH1 up
+ip netns exec $NS1 ip addr add 192.168.253.2/24 dev $VETH1
+ip netns exec $NS1 netserver
+
+echo 1 > ${TRACE_ROOT}/tracing_on
+cp /dev/null ${TRACE_ROOT}/trace
+ip route add 192.168.253.2/32 encap bpf out obj lwt_len_hist_kern.o section len_hist dev $VETH0
+netperf -H 192.168.253.2 -t TCP_STREAM
+cat ${TRACE_ROOT}/trace | grep -v '^#'
+./lwt_len_hist
+cleanup
+echo 0 > ${TRACE_ROOT}/tracing_on
+
+exit 0
diff --git a/samples/bpf/lwt_len_hist_kern.c b/samples/bpf/lwt_len_hist_kern.c
new file mode 100644
index 0000000..df75383
--- /dev/null
+++ b/samples/bpf/lwt_len_hist_kern.c
@@ -0,0 +1,82 @@
+/* Copyright (c) 2016 Thomas Graf <tgraf@tgraf.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <uapi/linux/bpf.h>
+#include <uapi/linux/if_ether.h>
+#include <uapi/linux/ip.h>
+#include <uapi/linux/in.h>
+#include "bpf_helpers.h"
+
+# define printk(fmt, ...) \
+ ({ \
+ char ____fmt[] = fmt; \
+ bpf_trace_printk(____fmt, sizeof(____fmt), \
+ ##__VA_ARGS__); \
+ })
+
+struct bpf_elf_map {
+ __u32 type;
+ __u32 size_key;
+ __u32 size_value;
+ __u32 max_elem;
+ __u32 flags;
+ __u32 id;
+ __u32 pinning;
+};
+
+struct bpf_elf_map SEC("maps") lwt_len_hist_map = {
+ .type = BPF_MAP_TYPE_PERCPU_HASH,
+ .size_key = sizeof(__u64),
+ .size_value = sizeof(__u64),
+ .pinning = 2,
+ .max_elem = 1024,
+};
+
+static unsigned int log2(unsigned int v)
+{
+ unsigned int r;
+ unsigned int shift;
+
+ r = (v > 0xFFFF) << 4; v >>= r;
+ shift = (v > 0xFF) << 3; v >>= shift; r |= shift;
+ shift = (v > 0xF) << 2; v >>= shift; r |= shift;
+ shift = (v > 0x3) << 1; v >>= shift; r |= shift;
+ r |= (v >> 1);
+ return r;
+}
+
+static unsigned int log2l(unsigned long v)
+{
+ unsigned int hi = v >> 32;
+ if (hi)
+ return log2(hi) + 32;
+ else
+ return log2(v);
+}
+
+SEC("len_hist")
+int do_len_hist(struct __sk_buff *skb)
+{
+ __u64 *value, key, init_val = 1;
+
+ key = log2l(skb->len);
+
+ value = bpf_map_lookup_elem(&lwt_len_hist_map, &key);
+ if (value)
+ __sync_fetch_and_add(value, 1);
+ else
+ bpf_map_update_elem(&lwt_len_hist_map, &key, &init_val, BPF_ANY);
+
+ return BPF_OK;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
new file mode 100644
index 0000000..05d783f
--- /dev/null
+++ b/samples/bpf/lwt_len_hist_user.c
@@ -0,0 +1,76 @@
+#include <linux/unistd.h>
+#include <linux/bpf.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <arpa/inet.h>
+
+#include "libbpf.h"
+#include "bpf_util.h"
+
+#define MAX_INDEX 64
+#define MAX_STARS 38
+
+static void stars(char *str, long val, long max, int width)
+{
+ int i;
+
+ for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++)
+ str[i] = '*';
+ if (val > max)
+ str[i - 1] = '+';
+ str[i] = '\0';
+}
+
+int main(int argc, char **argv)
+{
+ unsigned int nr_cpus = bpf_num_possible_cpus();
+ const char *map_filename = "/sys/fs/bpf/tc/globals/lwt_len_hist_map";
+ uint64_t values[nr_cpus], sum, max_value = 0, data[MAX_INDEX] = {};
+ uint64_t key = 0, next_key, max_key = 0;
+ char starstr[MAX_STARS];
+ int i, map_fd;
+
+ map_fd = bpf_obj_get(map_filename);
+ if (map_fd < 0) {
+ fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n",
+ map_filename, strerror(errno), errno);
+ return -1;
+ }
+
+ while (bpf_get_next_key(map_fd, &key, &next_key) == 0) {
+ if (next_key >= MAX_INDEX) {
+ fprintf(stderr, "Key %lu out of bounds\n", next_key);
+ continue;
+ }
+
+ bpf_lookup_elem(map_fd, &next_key, values);
+
+ sum = 0;
+ for (i = 0; i < nr_cpus; i++)
+ sum += values[i];
+
+ data[next_key] = sum;
+ if (sum && next_key > max_key)
+ max_key = next_key;
+
+ if (sum > max_value)
+ max_value = sum;
+
+ key = next_key;
+ }
+
+ for (i = 1; i <= max_key + 1; i++) {
+ stars(starstr, data[i - 1], max_value, MAX_STARS);
+ printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
+ (1l << i) >> 1, (1l << i) - 1, data[i - 1],
+ MAX_STARS, starstr);
+ }
+
+ close(map_fd);
+
+ return 0;
+}
diff --git a/samples/bpf/test_lwt_bpf.c b/samples/bpf/test_lwt_bpf.c
new file mode 100644
index 0000000..bacc801
--- /dev/null
+++ b/samples/bpf/test_lwt_bpf.c
@@ -0,0 +1,253 @@
+/* Copyright (c) 2016 Thomas Graf <tgraf@tgraf.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+#include <linux/bpf.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/icmpv6.h>
+#include <linux/if_ether.h>
+#include "bpf_helpers.h"
+#include <string.h>
+
+# define printk(fmt, ...) \
+ ({ \
+ char ____fmt[] = fmt; \
+ bpf_trace_printk(____fmt, sizeof(____fmt), \
+ ##__VA_ARGS__); \
+ })
+
+#define CB_MAGIC 1234
+
+/* Test: Pass all packets through */
+SEC("nop")
+int do_nop(struct __sk_buff *skb)
+{
+ return BPF_OK;
+}
+
+/* Test: Verify context information can be accessed */
+SEC("test_ctx")
+int do_test_ctx(struct __sk_buff *skb)
+{
+ skb->cb[0] = CB_MAGIC;
+ printk("len %d hash %d protocol %d\n", skb->len, skb->hash,
+ skb->protocol);
+ printk("cb %d ingress_ifindex %d ifindex %d\n", skb->cb[0],
+ skb->ingress_ifindex, skb->ifindex);
+
+ return BPF_OK;
+}
+
+/* Test: Ensure skb->cb[] buffer is cleared */
+SEC("test_cb")
+int do_test_cb(struct __sk_buff *skb)
+{
+ printk("cb0: %x cb1: %x cb2: %x\n", skb->cb[0], skb->cb[1],
+ skb->cb[2]);
+ printk("cb3: %x cb4: %x\n", skb->cb[3], skb->cb[4]);
+
+ return BPF_OK;
+}
+
+/* Test: Verify skb data can be read */
+SEC("test_data")
+int do_test_data(struct __sk_buff *skb)
+{
+ void *data = (void *)(long)skb->data;
+ void *data_end = (void *)(long)skb->data_end;
+ struct iphdr *iph = data;
+
+ if (data + sizeof(*iph) > data_end) {
+ printk("packet truncated\n");
+ return BPF_DROP;
+ }
+
+ printk("src: %x dst: %x\n", iph->saddr, iph->daddr);
+
+ return BPF_OK;
+}
+
+#define IP_CSUM_OFF offsetof(struct iphdr, check)
+#define IP_DST_OFF offsetof(struct iphdr, daddr)
+#define IP_SRC_OFF offsetof(struct iphdr, saddr)
+#define IP_PROTO_OFF offsetof(struct iphdr, protocol)
+#define TCP_CSUM_OFF offsetof(struct tcphdr, check)
+#define UDP_CSUM_OFF offsetof(struct udphdr, check)
+#define IS_PSEUDO 0x10
+
+static inline int rewrite(struct __sk_buff *skb, uint32_t old_ip,
+ uint32_t new_ip, int rw_daddr)
+{
+ int ret, off = 0, flags = IS_PSEUDO;
+ uint8_t proto;
+
+ ret = bpf_skb_load_bytes(skb, IP_PROTO_OFF, &proto, 1);
+ if (ret < 0) {
+ printk("bpf_l4_csum_replace failed: %d\n", ret);
+ return BPF_DROP;
+ }
+
+ switch (proto) {
+ case IPPROTO_TCP:
+ off = TCP_CSUM_OFF;
+ break;
+
+ case IPPROTO_UDP:
+ off = UDP_CSUM_OFF;
+ flags |= BPF_F_MARK_MANGLED_0;
+ break;
+
+ case IPPROTO_ICMPV6:
+ off = offsetof(struct icmp6hdr, icmp6_cksum);
+ break;
+ }
+
+ if (off) {
+ ret = bpf_l4_csum_replace(skb, off, old_ip, new_ip,
+ flags | sizeof(new_ip));
+ if (ret < 0) {
+ printk("bpf_l4_csum_replace failed: %d\n");
+ return BPF_DROP;
+ }
+ }
+
+ ret = bpf_l3_csum_replace(skb, IP_CSUM_OFF, old_ip, new_ip, sizeof(new_ip));
+ if (ret < 0) {
+ printk("bpf_l3_csum_replace failed: %d\n", ret);
+ return BPF_DROP;
+ }
+
+ if (rw_daddr)
+ ret = bpf_skb_store_bytes(skb, IP_DST_OFF, &new_ip, sizeof(new_ip), 0);
+ else
+ ret = bpf_skb_store_bytes(skb, IP_SRC_OFF, &new_ip, sizeof(new_ip), 0);
+
+ if (ret < 0) {
+ printk("bpf_skb_store_bytes() failed: %d\n", ret);
+ return BPF_DROP;
+ }
+
+ return BPF_OK;
+}
+
+/* Test: Verify skb data can be modified */
+SEC("test_rewrite")
+int do_test_rewrite(struct __sk_buff *skb)
+{
+ uint32_t old_ip, new_ip = 0x3fea8c0;
+ int ret;
+
+ ret = bpf_skb_load_bytes(skb, IP_DST_OFF, &old_ip, 4);
+ if (ret < 0) {
+ printk("bpf_skb_load_bytes failed: %d\n", ret);
+ return BPF_DROP;
+ }
+
+ if (old_ip == 0x2fea8c0) {
+ printk("out: rewriting from %x to %x\n", old_ip, new_ip);
+ return rewrite(skb, old_ip, new_ip, 1);
+ }
+
+ return BPF_OK;
+}
+
+static inline int __do_push_ll_and_redirect(struct __sk_buff *skb)
+{
+ uint64_t smac = SRC_MAC, dmac = DST_MAC;
+ int ret, ifindex = DST_IFINDEX;
+ struct ethhdr ehdr;
+
+ ret = bpf_skb_change_head(skb, 14, 0);
+ if (ret < 0) {
+ printk("skb_change_head() failed: %d\n", ret);
+ }
+
+ ehdr.h_proto = __constant_htons(ETH_P_IP);
+ memcpy(&ehdr.h_source, &smac, 6);
+ memcpy(&ehdr.h_dest, &dmac, 6);
+
+ ret = bpf_skb_store_bytes(skb, 0, &ehdr, sizeof(ehdr), 0);
+ if (ret < 0) {
+ printk("skb_store_bytes() failed: %d\n", ret);
+ return BPF_DROP;
+ }
+
+ return bpf_redirect(ifindex, 0);
+}
+
+SEC("push_ll_and_redirect_silent")
+int do_push_ll_and_redirect_silent(struct __sk_buff *skb)
+{
+ return __do_push_ll_and_redirect(skb);
+}
+
+SEC("push_ll_and_redirect")
+int do_push_ll_and_redirect(struct __sk_buff *skb)
+{
+ int ret, ifindex = DST_IFINDEX;
+
+ ret = __do_push_ll_and_redirect(skb);
+ if (ret >= 0)
+ printk("redirected to %d\n", ifindex);
+
+ return ret;
+}
+
+static inline void __fill_garbage(struct __sk_buff *skb)
+{
+ uint64_t f = 0xFFFFFFFFFFFFFFFF;
+
+ bpf_skb_store_bytes(skb, 0, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 8, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 16, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 24, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 32, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 40, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 48, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 56, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 64, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 72, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 80, &f, sizeof(f), 0);
+ bpf_skb_store_bytes(skb, 88, &f, sizeof(f), 0);
+}
+
+SEC("fill_garbage")
+int do_fill_garbage(struct __sk_buff *skb)
+{
+ __fill_garbage(skb);
+ printk("Set initial 96 bytes of header to FF\n");
+ return BPF_OK;
+}
+
+SEC("fill_garbage_and_redirect")
+int do_fill_garbage_and_redirect(struct __sk_buff *skb)
+{
+ int ifindex = DST_IFINDEX;
+ __fill_garbage(skb);
+ printk("redirected to %d\n", ifindex);
+ return bpf_redirect(ifindex, 0);
+}
+
+/* Drop all packets */
+SEC("drop_all")
+int do_drop_all(struct __sk_buff *skb)
+{
+ printk("dropping with: %d\n", BPF_DROP);
+ return BPF_DROP;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/samples/bpf/test_lwt_bpf.sh b/samples/bpf/test_lwt_bpf.sh
new file mode 100644
index 0000000..a695ae2
--- /dev/null
+++ b/samples/bpf/test_lwt_bpf.sh
@@ -0,0 +1,399 @@
+#!/bin/bash
+
+# Uncomment to see generated bytecode
+#VERBOSE=verbose
+
+NS1=lwt_ns1
+NS2=lwt_ns2
+VETH0=tst_lwt1a
+VETH1=tst_lwt1b
+VETH2=tst_lwt2a
+VETH3=tst_lwt2b
+IPVETH0="192.168.254.1"
+IPVETH1="192.168.254.2"
+IPVETH1b="192.168.254.3"
+
+IPVETH2="192.168.111.1"
+IPVETH3="192.168.111.2"
+
+IP_LOCAL="192.168.99.1"
+
+TRACE_ROOT=/sys/kernel/debug/tracing
+
+function lookup_mac()
+{
+ set +x
+ if [ ! -z "$2" ]; then
+ MAC=$(ip netns exec $2 ip link show $1 | grep ether | awk '{print $2}')
+ else
+ MAC=$(ip link show $1 | grep ether | awk '{print $2}')
+ fi
+ MAC="${MAC//:/}"
+ echo "0x${MAC:10:2}${MAC:8:2}${MAC:6:2}${MAC:4:2}${MAC:2:2}${MAC:0:2}"
+ set -x
+}
+
+function cleanup {
+ set +ex
+ rm test_lwt_bpf.o 2> /dev/null
+ ip link del $VETH0 2> /dev/null
+ ip link del $VETH1 2> /dev/null
+ ip link del $VETH2 2> /dev/null
+ ip link del $VETH3 2> /dev/null
+ ip netns exec $NS1 killall netserver
+ ip netns delete $NS1 2> /dev/null
+ ip netns delete $NS2 2> /dev/null
+ set -ex
+}
+
+function setup_one_veth {
+ ip netns add $1
+ ip link add $2 type veth peer name $3
+ ip link set dev $2 up
+ ip addr add $4/24 dev $2
+ ip link set $3 netns $1
+ ip netns exec $1 ip link set dev $3 up
+ ip netns exec $1 ip addr add $5/24 dev $3
+
+ if [ "$6" ]; then
+ ip netns exec $1 ip addr add $6/32 dev $3
+ fi
+}
+
+function get_trace {
+ set +x
+ cat ${TRACE_ROOT}/trace | grep -v '^#'
+ set -x
+}
+
+function cleanup_routes {
+ ip route del ${IPVETH1}/32 dev $VETH0 2> /dev/null || true
+ ip route del table local local ${IP_LOCAL}/32 dev lo 2> /dev/null || true
+}
+
+function install_test {
+ cleanup_routes
+ cp /dev/null ${TRACE_ROOT}/trace
+
+ OPTS="encap bpf headroom 14 $1 obj test_lwt_bpf.o section $2 $VERBOSE"
+
+ if [ "$1" == "in" ]; then
+ ip route add table local local ${IP_LOCAL}/32 $OPTS dev lo
+ else
+ ip route add ${IPVETH1}/32 $OPTS dev $VETH0
+ fi
+}
+
+function remove_prog {
+ if [ "$1" == "in" ]; then
+ ip route del table local local ${IP_LOCAL}/32 dev lo
+ else
+ ip route del ${IPVETH1}/32 dev $VETH0
+ fi
+}
+
+function filter_trace {
+ # Add newline to allow starting EXPECT= variables on newline
+ NL=$'\n'
+ echo "${NL}$*" | sed -e 's/^.*: : //g'
+}
+
+function expect_fail {
+ set +x
+ echo "FAIL:"
+ echo "Expected: $1"
+ echo "Got: $2"
+ set -x
+ exit 1
+}
+
+function match_trace {
+ set +x
+ RET=0
+ TRACE=$1
+ EXPECT=$2
+ GOT="$(filter_trace "$TRACE")"
+
+ [ "$GOT" != "$EXPECT" ] && {
+ expect_fail "$EXPECT" "$GOT"
+ RET=1
+ }
+ set -x
+ return $RET
+}
+
+function test_start {
+ set +x
+ echo "----------------------------------------------------------------"
+ echo "Starting test: $*"
+ echo "----------------------------------------------------------------"
+ set -x
+}
+
+function failure {
+ get_trace
+ echo "FAIL: $*"
+ exit 1
+}
+
+function test_ctx_xmit {
+ test_start "test_ctx on lwt xmit"
+ install_test xmit test_ctx
+ ping -c 3 $IPVETH1 || {
+ failure "test_ctx xmit: packets are dropped"
+ }
+ match_trace "$(get_trace)" "
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 0 ifindex $DST_IFINDEX" || exit 1
+ remove_prog xmit
+}
+
+function test_ctx_out {
+ test_start "test_ctx on lwt out"
+ install_test out test_ctx
+ ping -c 3 $IPVETH1 || {
+ failure "test_ctx out: packets are dropped"
+ }
+ match_trace "$(get_trace)" "
+len 84 hash 0 protocol 0
+cb 1234 ingress_ifindex 0 ifindex 0
+len 84 hash 0 protocol 0
+cb 1234 ingress_ifindex 0 ifindex 0
+len 84 hash 0 protocol 0
+cb 1234 ingress_ifindex 0 ifindex 0" || exit 1
+ remove_prog out
+}
+
+function test_ctx_in {
+ test_start "test_ctx on lwt in"
+ install_test in test_ctx
+ ping -c 3 $IP_LOCAL || {
+ failure "test_ctx out: packets are dropped"
+ }
+ # We will both request & reply packets as the packets will
+ # be from $IP_LOCAL => $IP_LOCAL
+ match_trace "$(get_trace)" "
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 1 ifindex 1
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 1 ifindex 1
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 1 ifindex 1
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 1 ifindex 1
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 1 ifindex 1
+len 84 hash 0 protocol 8
+cb 1234 ingress_ifindex 1 ifindex 1" || exit 1
+ remove_prog in
+}
+
+function test_data {
+ test_start "test_data on lwt $1"
+ install_test $1 test_data
+ ping -c 3 $IPVETH1 || {
+ failure "test_data ${1}: packets are dropped"
+ }
+ match_trace "$(get_trace)" "
+src: 1fea8c0 dst: 2fea8c0
+src: 1fea8c0 dst: 2fea8c0
+src: 1fea8c0 dst: 2fea8c0" || exit 1
+ remove_prog $1
+}
+
+function test_data_in {
+ test_start "test_data on lwt in"
+ install_test in test_data
+ ping -c 3 $IP_LOCAL || {
+ failure "test_data in: packets are dropped"
+ }
+ # We will both request & reply packets as the packets will
+ # be from $IP_LOCAL => $IP_LOCAL
+ match_trace "$(get_trace)" "
+src: 163a8c0 dst: 163a8c0
+src: 163a8c0 dst: 163a8c0
+src: 163a8c0 dst: 163a8c0
+src: 163a8c0 dst: 163a8c0
+src: 163a8c0 dst: 163a8c0
+src: 163a8c0 dst: 163a8c0" || exit 1
+ remove_prog in
+}
+
+function test_cb {
+ test_start "test_cb on lwt $1"
+ install_test $1 test_cb
+ ping -c 3 $IPVETH1 || {
+ failure "test_cb ${1}: packets are dropped"
+ }
+ match_trace "$(get_trace)" "
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0" || exit 1
+ remove_prog $1
+}
+
+function test_cb_in {
+ test_start "test_cb on lwt in"
+ install_test in test_cb
+ ping -c 3 $IP_LOCAL || {
+ failure "test_cb in: packets are dropped"
+ }
+ # We will both request & reply packets as the packets will
+ # be from $IP_LOCAL => $IP_LOCAL
+ match_trace "$(get_trace)" "
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0
+cb0: 0 cb1: 0 cb2: 0
+cb3: 0 cb4: 0" || exit 1
+ remove_prog in
+}
+
+function test_drop_all {
+ test_start "test_drop_all on lwt $1"
+ install_test $1 drop_all
+ ping -c 3 $IPVETH1 && {
+ failure "test_drop_all ${1}: Unexpected success of ping"
+ }
+ match_trace "$(get_trace)" "
+dropping with: 2
+dropping with: 2
+dropping with: 2" || exit 1
+ remove_prog $1
+}
+
+function test_drop_all_in {
+ test_start "test_drop_all on lwt in"
+ install_test in drop_all
+ ping -c 3 $IP_LOCAL && {
+ failure "test_drop_all in: Unexpected success of ping"
+ }
+ match_trace "$(get_trace)" "
+dropping with: 2
+dropping with: 2
+dropping with: 2" || exit 1
+ remove_prog in
+}
+
+function test_push_ll_and_redirect {
+ test_start "test_push_ll_and_redirect on lwt xmit"
+ install_test xmit push_ll_and_redirect
+ ping -c 3 $IPVETH1 || {
+ failure "Redirected packets appear to be dropped"
+ }
+ match_trace "$(get_trace)" "
+redirected to $DST_IFINDEX
+redirected to $DST_IFINDEX
+redirected to $DST_IFINDEX" || exit 1
+ remove_prog xmit
+}
+
+function test_no_l2_and_redirect {
+ test_start "test_no_l2_and_redirect on lwt xmit"
+ install_test xmit fill_garbage_and_redirect
+ ping -c 3 $IPVETH1 && {
+ failure "Unexpected success despite lack of L2 header"
+ }
+ match_trace "$(get_trace)" "
+redirected to $DST_IFINDEX
+redirected to $DST_IFINDEX
+redirected to $DST_IFINDEX" || exit 1
+ remove_prog xmit
+}
+
+function test_rewrite {
+ test_start "test_rewrite on lwt xmit"
+ install_test xmit test_rewrite
+ ping -c 3 $IPVETH1 || {
+ failure "Rewritten packets appear to be dropped"
+ }
+ match_trace "$(get_trace)" "
+out: rewriting from 2fea8c0 to 3fea8c0
+out: rewriting from 2fea8c0 to 3fea8c0
+out: rewriting from 2fea8c0 to 3fea8c0" || exit 1
+ remove_prog out
+}
+
+function test_fill_garbage {
+ test_start "test_fill_garbage on lwt xmit"
+ install_test xmit fill_garbage
+ ping -c 3 $IPVETH1 && {
+ failure "test_drop_all ${1}: Unexpected success of ping"
+ }
+ match_trace "$(get_trace)" "
+Set initial 96 bytes of header to FF
+Set initial 96 bytes of header to FF
+Set initial 96 bytes of header to FF" || exit 1
+ remove_prog xmit
+}
+
+function test_netperf_nop {
+ test_start "test_netperf_nop on lwt xmit"
+ install_test xmit nop
+ netperf -H $IPVETH1 -t TCP_STREAM || {
+ failure "packets appear to be dropped"
+ }
+ match_trace "$(get_trace)" ""|| exit 1
+ remove_prog xmit
+}
+
+function test_netperf_redirect {
+ test_start "test_netperf_redirect on lwt xmit"
+ install_test xmit push_ll_and_redirect_silent
+ netperf -H $IPVETH1 -t TCP_STREAM || {
+ failure "Rewritten packets appear to be dropped"
+ }
+ match_trace "$(get_trace)" ""|| exit 1
+ remove_prog xmit
+}
+
+cleanup
+setup_one_veth $NS1 $VETH0 $VETH1 $IPVETH0 $IPVETH1 $IPVETH1b
+setup_one_veth $NS2 $VETH2 $VETH3 $IPVETH2 $IPVETH3
+ip netns exec $NS1 netserver
+echo 1 > ${TRACE_ROOT}/tracing_on
+
+DST_MAC=$(lookup_mac $VETH1 $NS1)
+SRC_MAC=$(lookup_mac $VETH0)
+DST_IFINDEX=$(cat /sys/class/net/$VETH0/ifindex)
+
+CLANG_OPTS="-O2 -target bpf -I ../include/"
+CLANG_OPTS+=" -DSRC_MAC=$SRC_MAC -DDST_MAC=$DST_MAC -DDST_IFINDEX=$DST_IFINDEX"
+clang $CLANG_OPTS -c test_lwt_bpf.c -o test_lwt_bpf.o
+
+test_ctx_xmit
+test_ctx_out
+test_ctx_in
+test_data "xmit"
+test_data "out"
+test_data_in
+test_cb "xmit"
+test_cb "out"
+test_cb_in
+test_drop_all "xmit"
+test_drop_all "out"
+test_drop_all_in
+test_rewrite
+test_push_ll_and_redirect
+test_no_l2_and_redirect
+test_fill_garbage
+test_netperf_nop
+test_netperf_redirect
+
+cleanup
+echo 0 > ${TRACE_ROOT}/tracing_on
+exit 0