selftests/bpf: test for seg6local End.BPF action (c99a84ea) · Commits · 戴 / test

tools/include/uapi/linux/bpf.h

+96 −1

Original line number	Diff line number	Diff line
		@@ -141,6 +141,7 @@ enum bpf_prog_type {
		BPF_PROG_TYPE_SK_MSG,
		BPF_PROG_TYPE_RAW_TRACEPOINT,
		BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
		BPF_PROG_TYPE_LWT_SEG6LOCAL,
		};

		enum bpf_attach_type {
		@@ -1902,6 +1903,90 @@ union bpf_attr {
		* egress otherwise). This is the only flag supported for now.
		* Return
		* SK_PASS on success, or SK_DROP on error.
		*
		* int bpf_lwt_push_encap(struct sk_buff skb, u32 type, void hdr, u32 len)
		* Description
		* Encapsulate the packet associated to skb within a Layer 3
		* protocol header. This header is provided in the buffer at
		* address hdr, with len its size in bytes. type indicates
		* the protocol of the header and can be one of:
		*
		* BPF_LWT_ENCAP_SEG6
		* IPv6 encapsulation with Segment Routing Header
		* (struct ipv6_sr_hdr). hdr only contains the SRH,
		* the IPv6 header is computed by the kernel.
		* BPF_LWT_ENCAP_SEG6_INLINE
		* Only works if skb contains an IPv6 packet. Insert a
		* Segment Routing Header (struct ipv6_sr_hdr) inside
		* the IPv6 header.
		*
		* A call to this helper is susceptible to change the underlaying
		* packet buffer. Therefore, at load time, all checks on pointers
		* previously done by the verifier are invalidated and must be
		* performed again, if the helper is used in combination with
		* direct packet access.
		* Return
		* 0 on success, or a negative error in case of failure.
		*
		* int bpf_lwt_seg6_store_bytes(struct sk_buff skb, u32 offset, const void from, u32 len)
		* Description
		* Store len bytes from address from into the packet
		* associated to skb, at offset. Only the flags, tag and TLVs
		* inside the outermost IPv6 Segment Routing Header can be
		* modified through this helper.
		*
		* A call to this helper is susceptible to change the underlaying
		* packet buffer. Therefore, at load time, all checks on pointers
		* previously done by the verifier are invalidated and must be
		* performed again, if the helper is used in combination with
		* direct packet access.
		* Return
		* 0 on success, or a negative error in case of failure.
		*
		* int bpf_lwt_seg6_adjust_srh(struct sk_buff *skb, u32 offset, s32 delta)
		* Description
		* Adjust the size allocated to TLVs in the outermost IPv6
		* Segment Routing Header contained in the packet associated to
		* skb, at position offset by delta bytes. Only offsets
		* after the segments are accepted. delta can be as well
		* positive (growing) as negative (shrinking).
		*
		* A call to this helper is susceptible to change the underlaying
		* packet buffer. Therefore, at load time, all checks on pointers
		* previously done by the verifier are invalidated and must be
		* performed again, if the helper is used in combination with
		* direct packet access.
		* Return
		* 0 on success, or a negative error in case of failure.
		*
		* int bpf_lwt_seg6_action(struct sk_buff skb, u32 action, void param, u32 param_len)
		* Description
		* Apply an IPv6 Segment Routing action of type action to the
		* packet associated to skb. Each action takes a parameter
		* contained at address param, and of length param_len bytes.
		* action can be one of:
		*
		* SEG6_LOCAL_ACTION_END_X
		* End.X action: Endpoint with Layer-3 cross-connect.
		* Type of param: struct in6_addr.
		* SEG6_LOCAL_ACTION_END_T
		* End.T action: Endpoint with specific IPv6 table lookup.
		* Type of param: int.
		* SEG6_LOCAL_ACTION_END_B6
		* End.B6 action: Endpoint bound to an SRv6 policy.
		* Type of param: struct ipv6_sr_hdr.
		* SEG6_LOCAL_ACTION_END_B6_ENCAP
		* End.B6.Encap action: Endpoint bound to an SRv6
		* encapsulation policy.
		* Type of param: struct ipv6_sr_hdr.
		*
		* A call to this helper is susceptible to change the underlaying
		* packet buffer. Therefore, at load time, all checks on pointers
		* previously done by the verifier are invalidated and must be
		* performed again, if the helper is used in combination with
		* direct packet access.
		* Return
		* 0 on success, or a negative error in case of failure.
		*/
		#define __BPF_FUNC_MAPPER(FN) \
		FN(unspec), \
		@@ -1976,7 +2061,11 @@ union bpf_attr {
		FN(fib_lookup), \
		FN(sock_hash_update), \
		FN(msg_redirect_hash), \
		FN(sk_redirect_hash),
		FN(sk_redirect_hash), \
		FN(lwt_push_encap), \
		FN(lwt_seg6_store_bytes), \
		FN(lwt_seg6_adjust_srh), \
		FN(lwt_seg6_action),

		/* integer value in 'imm' field of BPF_CALL instruction selects which helper
		* function eBPF program intends to call
		@@ -2043,6 +2132,12 @@ enum bpf_hdr_start_off {
		BPF_HDR_START_NET,
		};

		/* Encapsulation type for BPF_FUNC_lwt_push_encap helper. */
		enum bpf_lwt_encap_mode {
		BPF_LWT_ENCAP_SEG6,
		BPF_LWT_ENCAP_SEG6_INLINE
		};

		/* user accessible mirror of in-kernel sk_buff.
		* new fields can only be added to the end of this structure
		*/

tools/testing/selftests/bpf/Makefile

+4 −2

Original line number	Diff line number	Diff line
		@@ -33,7 +33,8 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
		sample_map_ret0.o test_tcpbpf_kern.o test_stacktrace_build_id.o \
		sockmap_tcp_msg_prog.o connect4_prog.o connect6_prog.o test_adjust_tail.o \
		test_btf_haskv.o test_btf_nokv.o test_sockmap_kern.o test_tunnel_kern.o \
		test_get_stack_rawtp.o test_sockmap_kern.o test_sockhash_kern.o
		test_get_stack_rawtp.o test_sockmap_kern.o test_sockhash_kern.o \
		test_lwt_seg6local.o

		# Order correspond to 'make run_tests' order
		TEST_PROGS := test_kmod.sh \
		@@ -42,7 +43,8 @@ TEST_PROGS := test_kmod.sh \
		test_xdp_meta.sh \
		test_offload.py \
		test_sock_addr.sh \
		test_tunnel.sh
		test_tunnel.sh \
		test_lwt_seg6local.sh

		# Compile but not part of 'make run_tests'
		TEST_GEN_PROGS_EXTENDED = test_libbpf_open test_sock_addr

tools/testing/selftests/bpf/bpf_helpers.h

+12 −0

Original line number	Diff line number	Diff line
		@@ -114,6 +114,18 @@ static int (bpf_get_stack)(void ctx, void *buf, int size, int flags) =
		static int (bpf_fib_lookup)(void ctx, struct bpf_fib_lookup *params,
		int plen, __u32 flags) =
		(void *) BPF_FUNC_fib_lookup;
		static int (bpf_lwt_push_encap)(void ctx, unsigned int type, void *hdr,
		unsigned int len) =
		(void *) BPF_FUNC_lwt_push_encap;
		static int (bpf_lwt_seg6_store_bytes)(void ctx, unsigned int offset,
		void *from, unsigned int len) =
		(void *) BPF_FUNC_lwt_seg6_store_bytes;
		static int (bpf_lwt_seg6_action)(void ctx, unsigned int action, void *param,
		unsigned int param_len) =
		(void *) BPF_FUNC_lwt_seg6_action;
		static int (bpf_lwt_seg6_adjust_srh)(void ctx, unsigned int offset,
		unsigned int len) =
		(void *) BPF_FUNC_lwt_seg6_adjust_srh;

		/* llvm builtin functions that eBPF C program may use to
		* emit BPF_LD_ABS and BPF_LD_IND instructions

tools/testing/selftests/bpf/test_lwt_seg6local.c

0 → 100644

+437 −0

Original line number	Diff line number	Diff line
		#include <stddef.h>
		#include <inttypes.h>
		#include <errno.h>
		#include <linux/seg6_local.h>
		#include <linux/bpf.h>
		#include "bpf_helpers.h"
		#include "bpf_endian.h"

		#define bpf_printk(fmt, ...) \
		({ \
		char ____fmt[] = fmt; \
		bpf_trace_printk(____fmt, sizeof(____fmt), \
		##__VA_ARGS__); \
		})

		/* Packet parsing state machine helpers. */
		#define cursor_advance(_cursor, _len) \
		({ void *_tmp = _cursor; _cursor += _len; _tmp; })

		#define SR6_FLAG_ALERT (1 << 4)

		#define htonll(x) ((bpf_htonl(1)) == 1 ? (x) : ((uint64_t)bpf_htonl((x) & \
		0xFFFFFFFF) << 32) \| bpf_htonl((x) >> 32))
		#define ntohll(x) ((bpf_ntohl(1)) == 1 ? (x) : ((uint64_t)bpf_ntohl((x) & \
		0xFFFFFFFF) << 32) \| bpf_ntohl((x) >> 32))
		#define BPF_PACKET_HEADER __attribute__((packed))

		struct ip6_t {
		unsigned int ver:4;
		unsigned int priority:8;
		unsigned int flow_label:20;
		unsigned short payload_len;
		unsigned char next_header;
		unsigned char hop_limit;
		unsigned long long src_hi;
		unsigned long long src_lo;
		unsigned long long dst_hi;
		unsigned long long dst_lo;
		} BPF_PACKET_HEADER;

		struct ip6_addr_t {
		unsigned long long hi;
		unsigned long long lo;
		} BPF_PACKET_HEADER;

		struct ip6_srh_t {
		unsigned char nexthdr;
		unsigned char hdrlen;
		unsigned char type;
		unsigned char segments_left;
		unsigned char first_segment;
		unsigned char flags;
		unsigned short tag;

		struct ip6_addr_t segments[0];
		} BPF_PACKET_HEADER;

		struct sr6_tlv_t {
		unsigned char type;
		unsigned char len;
		unsigned char value[0];
		} BPF_PACKET_HEADER;

		__attribute__((always_inline)) struct ip6_srh_t get_srh(struct __sk_buff skb)
		{
		void cursor, data_end;
		struct ip6_srh_t *srh;
		struct ip6_t *ip;
		uint8_t *ipver;

		data_end = (void *)(long)skb->data_end;
		cursor = (void *)(long)skb->data;
		ipver = (uint8_t *)cursor;

		if ((void )ipver + sizeof(ipver) > data_end)
		return NULL;

		if ((*ipver >> 4) != 6)
		return NULL;

		ip = cursor_advance(cursor, sizeof(*ip));
		if ((void )ip + sizeof(ip) > data_end)
		return NULL;

		if (ip->next_header != 43)
		return NULL;

		srh = cursor_advance(cursor, sizeof(*srh));
		if ((void )srh + sizeof(srh) > data_end)
		return NULL;

		if (srh->type != 4)
		return NULL;

		return srh;
		}

		__attribute__((always_inline))
		int update_tlv_pad(struct __sk_buff *skb, uint32_t new_pad,
		uint32_t old_pad, uint32_t pad_off)
		{
		int err;

		if (new_pad != old_pad) {
		err = bpf_lwt_seg6_adjust_srh(skb, pad_off,
		(int) new_pad - (int) old_pad);
		if (err)
		return err;
		}

		if (new_pad > 0) {
		char pad_tlv_buf[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
		0, 0, 0};
		struct sr6_tlv_t pad_tlv = (struct sr6_tlv_t ) pad_tlv_buf;

		pad_tlv->type = SR6_TLV_PADDING;
		pad_tlv->len = new_pad - 2;

		err = bpf_lwt_seg6_store_bytes(skb, pad_off,
		(void *)pad_tlv_buf, new_pad);
		if (err)
		return err;
		}

		return 0;
		}

		__attribute__((always_inline))
		int is_valid_tlv_boundary(struct __sk_buff skb, struct ip6_srh_t srh,
		uint32_t tlv_off, uint32_t pad_size,
		uint32_t *pad_off)
		{
		uint32_t srh_off, cur_off;
		int offset_valid = 0;
		int err;

		srh_off = (char )srh - (char )(long)skb->data;
		// cur_off = end of segments, start of possible TLVs
		cur_off = srh_off + sizeof(*srh) +
		sizeof(struct ip6_addr_t) * (srh->first_segment + 1);

		*pad_off = 0;

		// we can only go as far as ~10 TLVs due to the BPF max stack size
		#pragma clang loop unroll(full)
		for (int i = 0; i < 10; i++) {
		struct sr6_tlv_t tlv;

		if (cur_off == *tlv_off)
		offset_valid = 1;

		if (cur_off >= srh_off + ((srh->hdrlen + 1) << 3))
		break;

		err = bpf_skb_load_bytes(skb, cur_off, &tlv, sizeof(tlv));
		if (err)
		return err;

		if (tlv.type == SR6_TLV_PADDING) {
		*pad_size = tlv.len + sizeof(tlv);
		*pad_off = cur_off;

		if (*tlv_off == srh_off) {
		*tlv_off = cur_off;
		offset_valid = 1;
		}
		break;

		} else if (tlv.type == SR6_TLV_HMAC) {
		break;
		}

		cur_off += sizeof(tlv) + tlv.len;
		} // we reached the padding or HMAC TLVs, or the end of the SRH

		if (*pad_off == 0)
		*pad_off = cur_off;

		if (*tlv_off == -1)
		*tlv_off = cur_off;
		else if (!offset_valid)
		return -EINVAL;

		return 0;
		}

		__attribute__((always_inline))
		int add_tlv(struct __sk_buff skb, struct ip6_srh_t srh, uint32_t tlv_off,
		struct sr6_tlv_t *itlv, uint8_t tlv_size)
		{
		uint32_t srh_off = (char )srh - (char )(long)skb->data;
		uint8_t len_remaining, new_pad;
		uint32_t pad_off = 0;
		uint32_t pad_size = 0;
		uint32_t partial_srh_len;
		int err;

		if (tlv_off != -1)
		tlv_off += srh_off;

		if (itlv->type == SR6_TLV_PADDING \|\| itlv->type == SR6_TLV_HMAC)
		return -EINVAL;

		err = is_valid_tlv_boundary(skb, srh, &tlv_off, &pad_size, &pad_off);
		if (err)
		return err;

		err = bpf_lwt_seg6_adjust_srh(skb, tlv_off, sizeof(*itlv) + itlv->len);
		if (err)
		return err;

		err = bpf_lwt_seg6_store_bytes(skb, tlv_off, (void *)itlv, tlv_size);
		if (err)
		return err;

		// the following can't be moved inside update_tlv_pad because the
		// bpf verifier has some issues with it
		pad_off += sizeof(*itlv) + itlv->len;
		partial_srh_len = pad_off - srh_off;
		len_remaining = partial_srh_len % 8;
		new_pad = 8 - len_remaining;

		if (new_pad == 1) // cannot pad for 1 byte only
		new_pad = 9;
		else if (new_pad == 8)
		new_pad = 0;

		return update_tlv_pad(skb, new_pad, pad_size, pad_off);
		}

		__attribute__((always_inline))
		int delete_tlv(struct __sk_buff skb, struct ip6_srh_t srh,
		uint32_t tlv_off)
		{
		uint32_t srh_off = (char )srh - (char )(long)skb->data;
		uint8_t len_remaining, new_pad;
		uint32_t partial_srh_len;
		uint32_t pad_off = 0;
		uint32_t pad_size = 0;
		struct sr6_tlv_t tlv;
		int err;

		tlv_off += srh_off;

		err = is_valid_tlv_boundary(skb, srh, &tlv_off, &pad_size, &pad_off);
		if (err)
		return err;

		err = bpf_skb_load_bytes(skb, tlv_off, &tlv, sizeof(tlv));
		if (err)
		return err;

		err = bpf_lwt_seg6_adjust_srh(skb, tlv_off, -(sizeof(tlv) + tlv.len));
		if (err)
		return err;

		pad_off -= sizeof(tlv) + tlv.len;
		partial_srh_len = pad_off - srh_off;
		len_remaining = partial_srh_len % 8;
		new_pad = 8 - len_remaining;
		if (new_pad == 1) // cannot pad for 1 byte only
		new_pad = 9;
		else if (new_pad == 8)
		new_pad = 0;

		return update_tlv_pad(skb, new_pad, pad_size, pad_off);
		}

		__attribute__((always_inline))
		int has_egr_tlv(struct __sk_buff skb, struct ip6_srh_t srh)
		{
		int tlv_offset = sizeof(struct ip6_t) + sizeof(struct ip6_srh_t) +
		((srh->first_segment + 1) << 4);
		struct sr6_tlv_t tlv;

		if (bpf_skb_load_bytes(skb, tlv_offset, &tlv, sizeof(struct sr6_tlv_t)))
		return 0;

		if (tlv.type == SR6_TLV_EGRESS && tlv.len == 18) {
		struct ip6_addr_t egr_addr;

		if (bpf_skb_load_bytes(skb, tlv_offset + 4, &egr_addr, 16))
		return 0;

		// check if egress TLV value is correct
		if (ntohll(egr_addr.hi) == 0xfd00000000000000 &&
		ntohll(egr_addr.lo) == 0x4)
		return 1;
		}

		return 0;
		}

		// This function will push a SRH with segments fd00::1, fd00::2, fd00::3,
		// fd00::4
		SEC("encap_srh")
		int __encap_srh(struct __sk_buff *skb)
		{
		unsigned long long hi = 0xfd00000000000000;
		struct ip6_addr_t *seg;
		struct ip6_srh_t *srh;
		char srh_buf[72]; // room for 4 segments
		int err;

		srh = (struct ip6_srh_t *)srh_buf;
		srh->nexthdr = 0;
		srh->hdrlen = 8;
		srh->type = 4;
		srh->segments_left = 3;
		srh->first_segment = 3;
		srh->flags = 0;
		srh->tag = 0;

		seg = (struct ip6_addr_t )((char )srh + sizeof(*srh));

		#pragma clang loop unroll(full)
		for (unsigned long long lo = 0; lo < 4; lo++) {
		seg->lo = htonll(4 - lo);
		seg->hi = htonll(hi);
		seg = (struct ip6_addr_t )((char )seg + sizeof(*seg));
		}

		err = bpf_lwt_push_encap(skb, 0, (void *)srh, sizeof(srh_buf));
		if (err)
		return BPF_DROP;

		return BPF_REDIRECT;
		}

		// Add an Egress TLV fc00::4, add the flag A,
		// and apply End.X action to fc42::1
		SEC("add_egr_x")
		int __add_egr_x(struct __sk_buff *skb)
		{
		unsigned long long hi = 0xfc42000000000000;
		unsigned long long lo = 0x1;
		struct ip6_srh_t *srh = get_srh(skb);
		uint8_t new_flags = SR6_FLAG_ALERT;
		struct ip6_addr_t addr;
		int err, offset;

		if (srh == NULL)
		return BPF_DROP;

		uint8_t tlv[20] = {2, 18, 0, 0, 0xfd, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
		0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4};

		err = add_tlv(skb, srh, (srh->hdrlen+1) << 3,
		(struct sr6_tlv_t *)&tlv, 20);
		if (err)
		return BPF_DROP;

		offset = sizeof(struct ip6_t) + offsetof(struct ip6_srh_t, flags);
		err = bpf_lwt_seg6_store_bytes(skb, offset,
		(void *)&new_flags, sizeof(new_flags));
		if (err)
		return BPF_DROP;

		addr.lo = htonll(lo);
		addr.hi = htonll(hi);
		err = bpf_lwt_seg6_action(skb, SEG6_LOCAL_ACTION_END_X,
		(void *)&addr, sizeof(addr));
		if (err)
		return BPF_DROP;
		return BPF_REDIRECT;
		}

		// Pop the Egress TLV, reset the flags, change the tag 2442 and finally do a
		// simple End action
		SEC("pop_egr")
		int __pop_egr(struct __sk_buff *skb)
		{
		struct ip6_srh_t *srh = get_srh(skb);
		uint16_t new_tag = bpf_htons(2442);
		uint8_t new_flags = 0;
		int err, offset;

		if (srh == NULL)
		return BPF_DROP;

		if (srh->flags != SR6_FLAG_ALERT)
		return BPF_DROP;

		if (srh->hdrlen != 11) // 4 segments + Egress TLV + Padding TLV
		return BPF_DROP;

		if (!has_egr_tlv(skb, srh))
		return BPF_DROP;

		err = delete_tlv(skb, srh, 8 + (srh->first_segment + 1) * 16);
		if (err)
		return BPF_DROP;

		offset = sizeof(struct ip6_t) + offsetof(struct ip6_srh_t, flags);
		if (bpf_lwt_seg6_store_bytes(skb, offset, (void *)&new_flags,
		sizeof(new_flags)))
		return BPF_DROP;

		offset = sizeof(struct ip6_t) + offsetof(struct ip6_srh_t, tag);
		if (bpf_lwt_seg6_store_bytes(skb, offset, (void *)&new_tag,
		sizeof(new_tag)))
		return BPF_DROP;

		return BPF_OK;
		}

		// Inspect if the Egress TLV and flag have been removed, if the tag is correct,
		// then apply a End.T action to reach the last segment
		SEC("inspect_t")
		int __inspect_t(struct __sk_buff *skb)
		{
		struct ip6_srh_t *srh = get_srh(skb);
		int table = 117;
		int err;

		if (srh == NULL)
		return BPF_DROP;

		if (srh->flags != 0)
		return BPF_DROP;

		if (srh->tag != bpf_htons(2442))
		return BPF_DROP;

		if (srh->hdrlen != 8) // 4 segments
		return BPF_DROP;

		err = bpf_lwt_seg6_action(skb, SEG6_LOCAL_ACTION_END_T,
		(void *)&table, sizeof(table));

		if (err)
		return BPF_DROP;

		return BPF_REDIRECT;
		}

		char __license[] SEC("license") = "GPL";

tools/testing/selftests/bpf/test_lwt_seg6local.sh

0 → 100755

+140 −0

Original line number	Diff line number	Diff line
		#!/bin/bash
		# Connects 6 network namespaces through veths.
		# Each NS may have different IPv6 global scope addresses :
		# NS1 ---- NS2 ---- NS3 ---- NS4 ---- NS5 ---- NS6
		# fb00::1 fd00::1 fd00::2 fd00::3 fb00::6
		# fc42::1 fd00::4
		#
		# All IPv6 packets going to fb00::/16 through NS2 will be encapsulated in a
		# IPv6 header with a Segment Routing Header, with segments :
		# fd00::1 -> fd00::2 -> fd00::3 -> fd00::4
		#
		# 3 fd00::/16 IPv6 addresses are binded to seg6local End.BPF actions :
		# - fd00::1 : add a TLV, change the flags and apply a End.X action to fc42::1
		# - fd00::2 : remove the TLV, change the flags, add a tag
		# - fd00::3 : apply an End.T action to fd00::4, through routing table 117
		#
		# fd00::4 is a simple Segment Routing node decapsulating the inner IPv6 packet.
		# Each End.BPF action will validate the operations applied on the SRH by the
		# previous BPF program in the chain, otherwise the packet is dropped.
		#
		# An UDP datagram is sent from fb00::1 to fb00::6. The test succeeds if this
		# datagram can be read on NS6 when binding to fb00::6.

		TMP_FILE="/tmp/selftest_lwt_seg6local.txt"

		cleanup()
		{
		if [ "$?" = "0" ]; then
		echo "selftests: test_lwt_seg6local [PASS]";
		else
		echo "selftests: test_lwt_seg6local [FAILED]";
		fi

		set +e
		ip netns del ns1 2> /dev/null
		ip netns del ns2 2> /dev/null
		ip netns del ns3 2> /dev/null
		ip netns del ns4 2> /dev/null
		ip netns del ns5 2> /dev/null
		ip netns del ns6 2> /dev/null
		rm -f $TMP_FILE
		}

		set -e

		ip netns add ns1
		ip netns add ns2
		ip netns add ns3
		ip netns add ns4
		ip netns add ns5
		ip netns add ns6

		trap cleanup 0 2 3 6 9

		ip link add veth1 type veth peer name veth2
		ip link add veth3 type veth peer name veth4
		ip link add veth5 type veth peer name veth6
		ip link add veth7 type veth peer name veth8
		ip link add veth9 type veth peer name veth10

		ip link set veth1 netns ns1
		ip link set veth2 netns ns2
		ip link set veth3 netns ns2
		ip link set veth4 netns ns3
		ip link set veth5 netns ns3
		ip link set veth6 netns ns4
		ip link set veth7 netns ns4
		ip link set veth8 netns ns5
		ip link set veth9 netns ns5
		ip link set veth10 netns ns6

		ip netns exec ns1 ip link set dev veth1 up
		ip netns exec ns2 ip link set dev veth2 up
		ip netns exec ns2 ip link set dev veth3 up
		ip netns exec ns3 ip link set dev veth4 up
		ip netns exec ns3 ip link set dev veth5 up
		ip netns exec ns4 ip link set dev veth6 up
		ip netns exec ns4 ip link set dev veth7 up
		ip netns exec ns5 ip link set dev veth8 up
		ip netns exec ns5 ip link set dev veth9 up
		ip netns exec ns6 ip link set dev veth10 up
		ip netns exec ns6 ip link set dev lo up

		# All link scope addresses and routes required between veths
		ip netns exec ns1 ip -6 addr add fb00::12/16 dev veth1 scope link
		ip netns exec ns1 ip -6 route add fb00::21 dev veth1 scope link
		ip netns exec ns2 ip -6 addr add fb00::21/16 dev veth2 scope link
		ip netns exec ns2 ip -6 addr add fb00::34/16 dev veth3 scope link
		ip netns exec ns2 ip -6 route add fb00::43 dev veth3 scope link
		ip netns exec ns3 ip -6 route add fb00::65 dev veth5 scope link
		ip netns exec ns3 ip -6 addr add fb00::43/16 dev veth4 scope link
		ip netns exec ns3 ip -6 addr add fb00::56/16 dev veth5 scope link
		ip netns exec ns4 ip -6 addr add fb00::65/16 dev veth6 scope link
		ip netns exec ns4 ip -6 addr add fb00::78/16 dev veth7 scope link
		ip netns exec ns4 ip -6 route add fb00::87 dev veth7 scope link
		ip netns exec ns5 ip -6 addr add fb00::87/16 dev veth8 scope link
		ip netns exec ns5 ip -6 addr add fb00::910/16 dev veth9 scope link
		ip netns exec ns5 ip -6 route add fb00::109 dev veth9 scope link
		ip netns exec ns5 ip -6 route add fb00::109 table 117 dev veth9 scope link
		ip netns exec ns6 ip -6 addr add fb00::109/16 dev veth10 scope link

		ip netns exec ns1 ip -6 addr add fb00::1/16 dev lo
		ip netns exec ns1 ip -6 route add fb00::6 dev veth1 via fb00::21

		ip netns exec ns2 ip -6 route add fb00::6 encap bpf in obj test_lwt_seg6local.o sec encap_srh dev veth2
		ip netns exec ns2 ip -6 route add fd00::1 dev veth3 via fb00::43 scope link

		ip netns exec ns3 ip -6 route add fc42::1 dev veth5 via fb00::65
		ip netns exec ns3 ip -6 route add fd00::1 encap seg6local action End.BPF obj test_lwt_seg6local.o sec add_egr_x dev veth4

		ip netns exec ns4 ip -6 route add fd00::2 encap seg6local action End.BPF obj test_lwt_seg6local.o sec pop_egr dev veth6
		ip netns exec ns4 ip -6 addr add fc42::1 dev lo
		ip netns exec ns4 ip -6 route add fd00::3 dev veth7 via fb00::87

		ip netns exec ns5 ip -6 route add fd00::4 table 117 dev veth9 via fb00::109
		ip netns exec ns5 ip -6 route add fd00::3 encap seg6local action End.BPF obj test_lwt_seg6local.o sec inspect_t dev veth8

		ip netns exec ns6 ip -6 addr add fb00::6/16 dev lo
		ip netns exec ns6 ip -6 addr add fd00::4/16 dev lo

		ip netns exec ns1 sysctl net.ipv6.conf.all.forwarding=1 > /dev/null
		ip netns exec ns2 sysctl net.ipv6.conf.all.forwarding=1 > /dev/null
		ip netns exec ns3 sysctl net.ipv6.conf.all.forwarding=1 > /dev/null
		ip netns exec ns4 sysctl net.ipv6.conf.all.forwarding=1 > /dev/null
		ip netns exec ns5 sysctl net.ipv6.conf.all.forwarding=1 > /dev/null

		ip netns exec ns6 sysctl net.ipv6.conf.all.seg6_enabled=1 > /dev/null
		ip netns exec ns6 sysctl net.ipv6.conf.lo.seg6_enabled=1 > /dev/null
		ip netns exec ns6 sysctl net.ipv6.conf.veth10.seg6_enabled=1 > /dev/null

		ip netns exec ns6 nc -l -6 -u -d 7330 > $TMP_FILE &
		ip netns exec ns1 bash -c "echo 'foobar' \| nc -w0 -6 -u -p 2121 -s fb00::1 fb00::6 7330"
		sleep 5 # wait enough time to ensure the UDP datagram arrived to the last segment
		kill -INT $!

		if [[ $(< $TMP_FILE) != "foobar" ]]; then
		exit 1
		fi

		exit 0

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