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>
This commit is contained in:
Thomas Graf
David S. Miller
Родитель
3a0af8fd61
Коммит
f74599f7c5
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@ -29,6 +29,7 @@ hostprogs-y += test_current_task_under_cgroup
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hostprogs-y += trace_event
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hostprogs-y += trace_event
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hostprogs-y += sampleip
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hostprogs-y += sampleip
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hostprogs-y += tc_l2_redirect
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hostprogs-y += tc_l2_redirect
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hostprogs-y += lwt_len_hist
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test_lru_dist-objs := test_lru_dist.o libbpf.o
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test_lru_dist-objs := test_lru_dist.o libbpf.o
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sock_example-objs := sock_example.o libbpf.o
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sock_example-objs := sock_example.o libbpf.o
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@ -59,6 +60,7 @@ test_current_task_under_cgroup-objs := bpf_load.o libbpf.o \
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trace_event-objs := bpf_load.o libbpf.o trace_event_user.o
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trace_event-objs := bpf_load.o libbpf.o trace_event_user.o
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sampleip-objs := bpf_load.o libbpf.o sampleip_user.o
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sampleip-objs := bpf_load.o libbpf.o sampleip_user.o
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tc_l2_redirect-objs := bpf_load.o libbpf.o tc_l2_redirect_user.o
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tc_l2_redirect-objs := bpf_load.o libbpf.o tc_l2_redirect_user.o
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lwt_len_hist-objs := bpf_load.o libbpf.o lwt_len_hist_user.o
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# Tell kbuild to always build the programs
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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always := $(hostprogs-y)
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@ -89,6 +91,7 @@ always += xdp2_kern.o
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always += test_current_task_under_cgroup_kern.o
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always += test_current_task_under_cgroup_kern.o
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always += trace_event_kern.o
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always += trace_event_kern.o
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always += sampleip_kern.o
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always += sampleip_kern.o
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always += lwt_len_hist_kern.o
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HOSTCFLAGS += -I$(objtree)/usr/include
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HOSTCFLAGS += -I$(objtree)/usr/include
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HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
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HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
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@ -117,6 +120,7 @@ HOSTLOADLIBES_test_current_task_under_cgroup += -lelf
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HOSTLOADLIBES_trace_event += -lelf
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HOSTLOADLIBES_trace_event += -lelf
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HOSTLOADLIBES_sampleip += -lelf
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HOSTLOADLIBES_sampleip += -lelf
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HOSTLOADLIBES_tc_l2_redirect += -l elf
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HOSTLOADLIBES_tc_l2_redirect += -l elf
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HOSTLOADLIBES_lwt_len_hist += -l elf
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# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
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# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
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# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
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# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
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@ -80,6 +80,8 @@ struct bpf_map_def {
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unsigned int map_flags;
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unsigned int map_flags;
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};
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};
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static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
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(void *) BPF_FUNC_skb_load_bytes;
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static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
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static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
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(void *) BPF_FUNC_skb_store_bytes;
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(void *) BPF_FUNC_skb_store_bytes;
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static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
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static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
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@ -88,6 +90,8 @@ static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flag
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(void *) BPF_FUNC_l4_csum_replace;
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(void *) BPF_FUNC_l4_csum_replace;
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static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
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static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
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(void *) BPF_FUNC_skb_under_cgroup;
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(void *) BPF_FUNC_skb_under_cgroup;
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static int (*bpf_skb_change_head)(void *, int len, int flags) =
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(void *) BPF_FUNC_skb_change_head;
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#if defined(__x86_64__)
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#if defined(__x86_64__)
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@ -0,0 +1,37 @@
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#!/bin/bash
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NS1=lwt_ns1
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VETH0=tst_lwt1a
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VETH1=tst_lwt1b
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TRACE_ROOT=/sys/kernel/debug/tracing
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function cleanup {
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ip route del 192.168.253.2/32 dev $VETH0 2> /dev/null
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ip link del $VETH0 2> /dev/null
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ip link del $VETH1 2> /dev/null
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ip netns exec $NS1 killall netserver
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ip netns delete $NS1 2> /dev/null
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}
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cleanup
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ip netns add $NS1
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ip link add $VETH0 type veth peer name $VETH1
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ip link set dev $VETH0 up
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ip addr add 192.168.253.1/24 dev $VETH0
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ip link set $VETH1 netns $NS1
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ip netns exec $NS1 ip link set dev $VETH1 up
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ip netns exec $NS1 ip addr add 192.168.253.2/24 dev $VETH1
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ip netns exec $NS1 netserver
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echo 1 > ${TRACE_ROOT}/tracing_on
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cp /dev/null ${TRACE_ROOT}/trace
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ip route add 192.168.253.2/32 encap bpf out obj lwt_len_hist_kern.o section len_hist dev $VETH0
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netperf -H 192.168.253.2 -t TCP_STREAM
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cat ${TRACE_ROOT}/trace | grep -v '^#'
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./lwt_len_hist
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cleanup
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echo 0 > ${TRACE_ROOT}/tracing_on
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exit 0
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@ -0,0 +1,82 @@
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/* Copyright (c) 2016 Thomas Graf <tgraf@tgraf.ch>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <uapi/linux/bpf.h>
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#include <uapi/linux/if_ether.h>
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#include <uapi/linux/ip.h>
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#include <uapi/linux/in.h>
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#include "bpf_helpers.h"
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# define printk(fmt, ...) \
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({ \
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char ____fmt[] = fmt; \
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bpf_trace_printk(____fmt, sizeof(____fmt), \
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##__VA_ARGS__); \
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})
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struct bpf_elf_map {
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__u32 type;
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__u32 size_key;
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__u32 size_value;
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__u32 max_elem;
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__u32 flags;
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__u32 id;
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__u32 pinning;
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};
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struct bpf_elf_map SEC("maps") lwt_len_hist_map = {
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.type = BPF_MAP_TYPE_PERCPU_HASH,
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.size_key = sizeof(__u64),
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.size_value = sizeof(__u64),
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.pinning = 2,
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.max_elem = 1024,
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};
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static unsigned int log2(unsigned int v)
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{
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unsigned int r;
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unsigned int shift;
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r = (v > 0xFFFF) << 4; v >>= r;
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shift = (v > 0xFF) << 3; v >>= shift; r |= shift;
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shift = (v > 0xF) << 2; v >>= shift; r |= shift;
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shift = (v > 0x3) << 1; v >>= shift; r |= shift;
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r |= (v >> 1);
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return r;
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}
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static unsigned int log2l(unsigned long v)
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{
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unsigned int hi = v >> 32;
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if (hi)
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return log2(hi) + 32;
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else
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return log2(v);
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}
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SEC("len_hist")
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int do_len_hist(struct __sk_buff *skb)
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{
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__u64 *value, key, init_val = 1;
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key = log2l(skb->len);
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value = bpf_map_lookup_elem(&lwt_len_hist_map, &key);
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if (value)
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__sync_fetch_and_add(value, 1);
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else
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bpf_map_update_elem(&lwt_len_hist_map, &key, &init_val, BPF_ANY);
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return BPF_OK;
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}
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char _license[] SEC("license") = "GPL";
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@ -0,0 +1,76 @@
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#include <linux/unistd.h>
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#include <linux/bpf.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include "libbpf.h"
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#include "bpf_util.h"
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#define MAX_INDEX 64
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#define MAX_STARS 38
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static void stars(char *str, long val, long max, int width)
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{
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int i;
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for (i = 0; i < (width * val / max) - 1 && i < width - 1; i++)
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str[i] = '*';
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if (val > max)
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str[i - 1] = '+';
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str[i] = '\0';
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}
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int main(int argc, char **argv)
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{
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unsigned int nr_cpus = bpf_num_possible_cpus();
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const char *map_filename = "/sys/fs/bpf/tc/globals/lwt_len_hist_map";
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uint64_t values[nr_cpus], sum, max_value = 0, data[MAX_INDEX] = {};
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uint64_t key = 0, next_key, max_key = 0;
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char starstr[MAX_STARS];
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int i, map_fd;
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map_fd = bpf_obj_get(map_filename);
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if (map_fd < 0) {
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fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n",
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map_filename, strerror(errno), errno);
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return -1;
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}
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while (bpf_get_next_key(map_fd, &key, &next_key) == 0) {
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if (next_key >= MAX_INDEX) {
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fprintf(stderr, "Key %lu out of bounds\n", next_key);
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continue;
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}
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bpf_lookup_elem(map_fd, &next_key, values);
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sum = 0;
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for (i = 0; i < nr_cpus; i++)
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sum += values[i];
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data[next_key] = sum;
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if (sum && next_key > max_key)
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max_key = next_key;
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if (sum > max_value)
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max_value = sum;
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key = next_key;
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}
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for (i = 1; i <= max_key + 1; i++) {
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stars(starstr, data[i - 1], max_value, MAX_STARS);
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printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
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(1l << i) >> 1, (1l << i) - 1, data[i - 1],
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MAX_STARS, starstr);
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}
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close(map_fd);
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return 0;
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}
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@ -0,0 +1,253 @@
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/* Copyright (c) 2016 Thomas Graf <tgraf@tgraf.ch>
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*
|
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|
* 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.
|
||||||
|
*/
|
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|
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#include <stdint.h>
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#include <stddef.h>
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#include <linux/bpf.h>
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#include <linux/ip.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/icmpv6.h>
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#include <linux/if_ether.h>
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#include "bpf_helpers.h"
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#include <string.h>
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|
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# define printk(fmt, ...) \
|
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|
({ \
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char ____fmt[] = fmt; \
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|
bpf_trace_printk(____fmt, sizeof(____fmt), \
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|
##__VA_ARGS__); \
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|
})
|
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#define CB_MAGIC 1234
|
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|
|
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/* Test: Pass all packets through */
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SEC("nop")
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int do_nop(struct __sk_buff *skb)
|
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|
{
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return BPF_OK;
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||||||
|
}
|
||||||
|
|
||||||
|
/* Test: Verify context information can be accessed */
|
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|
SEC("test_ctx")
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int do_test_ctx(struct __sk_buff *skb)
|
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|
{
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|
skb->cb[0] = CB_MAGIC;
|
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|
printk("len %d hash %d protocol %d\n", skb->len, skb->hash,
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skb->protocol);
|
||||||
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printk("cb %d ingress_ifindex %d ifindex %d\n", skb->cb[0],
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skb->ingress_ifindex, skb->ifindex);
|
||||||
|
|
||||||
|
return BPF_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Test: Ensure skb->cb[] buffer is cleared */
|
||||||
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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";
|
||||||
|
|
@ -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
|
||||||
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