selftests/bpf: add XDP selftests for modifying and popping VLAN headers
This XDP selftest also contain a small TC-bpf component. It provoke the generic-XDP bug fixed in previous commit. The selftest itself shows how to do VLAN manipulation from XDP and TC. The test demonstrate how XDP ingress can remove a VLAN tag, and how TC egress can add back a VLAN tag. This use-case originates from a production need by ISP (kviknet.dk), who gets DSL-lines terminated as VLAN Q-in-Q tagged packets, and want to avoid having an net_device for every end-customer on the box doing the L2 to L3 termination. The test-setup is done via a veth-pair and creating two network namespaces (ns1 and ns2). The 'ns1' simulate the ISP network that are loading the BPF-progs stripping and adding VLAN IDs. The 'ns2' simulate the DSL-customer that are using VLAN tagged packets. Running the script with --interactive, will simply not call the cleanup function. This gives the effect of creating a testlab, that the users can inspect and play with. The --verbose option will simply request that the shell will print input lines as they are read, this include comments, which in effect make the comments visible docs. Reported-by: Yoel Caspersen <yoel@kviknet.dk> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>hifive-unleashed-5.1
Jesper Dangaard Brouer
Alexei Starovoitov
parent
4f775448f4
commit
97396ff0bc
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@ -36,7 +36,8 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
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test_get_stack_rawtp.o test_sockmap_kern.o test_sockhash_kern.o \
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test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
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get_cgroup_id_kern.o socket_cookie_prog.o test_select_reuseport_kern.o \
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test_skb_cgroup_id_kern.o bpf_flow.o netcnt_prog.o test_sk_lookup_kern.o
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test_skb_cgroup_id_kern.o bpf_flow.o netcnt_prog.o \
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test_sk_lookup_kern.o test_xdp_vlan.o
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# Order correspond to 'make run_tests' order
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TEST_PROGS := test_kmod.sh \
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@ -49,7 +50,8 @@ TEST_PROGS := test_kmod.sh \
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test_lwt_seg6local.sh \
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test_lirc_mode2.sh \
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test_skb_cgroup_id.sh \
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test_flow_dissector.sh
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test_flow_dissector.sh \
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test_xdp_vlan.sh
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# Compile but not part of 'make run_tests'
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TEST_GEN_PROGS_EXTENDED = test_libbpf_open test_sock_addr test_skb_cgroup_id_user \
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@ -0,0 +1,292 @@
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/* SPDX-License-Identifier: GPL-2.0
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* Copyright(c) 2018 Jesper Dangaard Brouer.
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*
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* XDP/TC VLAN manipulation example
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*
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* GOTCHA: Remember to disable NIC hardware offloading of VLANs,
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* else the VLAN tags are NOT inlined in the packet payload:
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*
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* # ethtool -K ixgbe2 rxvlan off
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*
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* Verify setting:
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* # ethtool -k ixgbe2 | grep rx-vlan-offload
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* rx-vlan-offload: off
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*
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*/
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#include <stddef.h>
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#include <stdbool.h>
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#include <string.h>
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#include <linux/bpf.h>
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <linux/in.h>
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#include <linux/pkt_cls.h>
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#include "bpf_helpers.h"
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#include "bpf_endian.h"
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/* linux/if_vlan.h have not exposed this as UAPI, thus mirror some here
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*
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* struct vlan_hdr - vlan header
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* @h_vlan_TCI: priority and VLAN ID
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* @h_vlan_encapsulated_proto: packet type ID or len
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*/
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struct _vlan_hdr {
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__be16 h_vlan_TCI;
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__be16 h_vlan_encapsulated_proto;
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};
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#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
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#define VLAN_PRIO_SHIFT 13
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#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
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#define VLAN_TAG_PRESENT VLAN_CFI_MASK
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#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
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#define VLAN_N_VID 4096
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struct parse_pkt {
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__u16 l3_proto;
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__u16 l3_offset;
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__u16 vlan_outer;
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__u16 vlan_inner;
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__u8 vlan_outer_offset;
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__u8 vlan_inner_offset;
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};
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char _license[] SEC("license") = "GPL";
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static __always_inline
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bool parse_eth_frame(struct ethhdr *eth, void *data_end, struct parse_pkt *pkt)
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{
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__u16 eth_type;
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__u8 offset;
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offset = sizeof(*eth);
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/* Make sure packet is large enough for parsing eth + 2 VLAN headers */
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if ((void *)eth + offset + (2*sizeof(struct _vlan_hdr)) > data_end)
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return false;
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eth_type = eth->h_proto;
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/* Handle outer VLAN tag */
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if (eth_type == bpf_htons(ETH_P_8021Q)
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|| eth_type == bpf_htons(ETH_P_8021AD)) {
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struct _vlan_hdr *vlan_hdr;
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vlan_hdr = (void *)eth + offset;
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pkt->vlan_outer_offset = offset;
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pkt->vlan_outer = bpf_ntohs(vlan_hdr->h_vlan_TCI)
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& VLAN_VID_MASK;
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eth_type = vlan_hdr->h_vlan_encapsulated_proto;
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offset += sizeof(*vlan_hdr);
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}
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/* Handle inner (double) VLAN tag */
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if (eth_type == bpf_htons(ETH_P_8021Q)
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|| eth_type == bpf_htons(ETH_P_8021AD)) {
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struct _vlan_hdr *vlan_hdr;
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vlan_hdr = (void *)eth + offset;
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pkt->vlan_inner_offset = offset;
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pkt->vlan_inner = bpf_ntohs(vlan_hdr->h_vlan_TCI)
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& VLAN_VID_MASK;
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eth_type = vlan_hdr->h_vlan_encapsulated_proto;
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offset += sizeof(*vlan_hdr);
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}
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pkt->l3_proto = bpf_ntohs(eth_type); /* Convert to host-byte-order */
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pkt->l3_offset = offset;
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return true;
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}
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/* Hint, VLANs are choosen to hit network-byte-order issues */
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#define TESTVLAN 4011 /* 0xFAB */
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// #define TO_VLAN 4000 /* 0xFA0 (hint 0xOA0 = 160) */
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SEC("xdp_drop_vlan_4011")
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int xdp_prognum0(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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struct parse_pkt pkt = { 0 };
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if (!parse_eth_frame(data, data_end, &pkt))
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return XDP_ABORTED;
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/* Drop specific VLAN ID example */
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if (pkt.vlan_outer == TESTVLAN)
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return XDP_ABORTED;
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/*
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* Using XDP_ABORTED makes it possible to record this event,
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* via tracepoint xdp:xdp_exception like:
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* # perf record -a -e xdp:xdp_exception
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* # perf script
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*/
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return XDP_PASS;
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}
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/*
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Commands to setup VLAN on Linux to test packets gets dropped:
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export ROOTDEV=ixgbe2
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export VLANID=4011
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ip link add link $ROOTDEV name $ROOTDEV.$VLANID type vlan id $VLANID
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ip link set dev $ROOTDEV.$VLANID up
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ip link set dev $ROOTDEV mtu 1508
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ip addr add 100.64.40.11/24 dev $ROOTDEV.$VLANID
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Load prog with ip tool:
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ip link set $ROOTDEV xdp off
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ip link set $ROOTDEV xdp object xdp_vlan01_kern.o section xdp_drop_vlan_4011
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*/
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/* Changing VLAN to zero, have same practical effect as removing the VLAN. */
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#define TO_VLAN 0
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SEC("xdp_vlan_change")
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int xdp_prognum1(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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struct parse_pkt pkt = { 0 };
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if (!parse_eth_frame(data, data_end, &pkt))
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return XDP_ABORTED;
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/* Change specific VLAN ID */
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if (pkt.vlan_outer == TESTVLAN) {
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struct _vlan_hdr *vlan_hdr = data + pkt.vlan_outer_offset;
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/* Modifying VLAN, preserve top 4 bits */
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vlan_hdr->h_vlan_TCI =
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bpf_htons((bpf_ntohs(vlan_hdr->h_vlan_TCI) & 0xf000)
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| TO_VLAN);
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}
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return XDP_PASS;
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}
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/*
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* Show XDP+TC can cooperate, on creating a VLAN rewriter.
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* 1. Create a XDP prog that can "pop"/remove a VLAN header.
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* 2. Create a TC-bpf prog that egress can add a VLAN header.
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*/
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#ifndef ETH_ALEN /* Ethernet MAC address length */
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#define ETH_ALEN 6 /* bytes */
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#endif
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#define VLAN_HDR_SZ 4 /* bytes */
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SEC("xdp_vlan_remove_outer")
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int xdp_prognum2(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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struct parse_pkt pkt = { 0 };
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char *dest;
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if (!parse_eth_frame(data, data_end, &pkt))
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return XDP_ABORTED;
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/* Skip packet if no outer VLAN was detected */
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if (pkt.vlan_outer_offset == 0)
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return XDP_PASS;
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/* Moving Ethernet header, dest overlap with src, memmove handle this */
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dest = data;
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dest+= VLAN_HDR_SZ;
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/*
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* Notice: Taking over vlan_hdr->h_vlan_encapsulated_proto, by
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* only moving two MAC addrs (12 bytes), not overwriting last 2 bytes
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*/
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__builtin_memmove(dest, data, ETH_ALEN * 2);
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/* Note: LLVM built-in memmove inlining require size to be constant */
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/* Move start of packet header seen by Linux kernel stack */
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bpf_xdp_adjust_head(ctx, VLAN_HDR_SZ);
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return XDP_PASS;
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}
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static __always_inline
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void shift_mac_4bytes_16bit(void *data)
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{
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__u16 *p = data;
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p[7] = p[5]; /* delete p[7] was vlan_hdr->h_vlan_TCI */
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p[6] = p[4]; /* delete p[6] was ethhdr->h_proto */
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p[5] = p[3];
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p[4] = p[2];
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p[3] = p[1];
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p[2] = p[0];
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}
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static __always_inline
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void shift_mac_4bytes_32bit(void *data)
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{
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__u32 *p = data;
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/* Assuming VLAN hdr present. The 4 bytes in p[3] that gets
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* overwritten, is ethhdr->h_proto and vlan_hdr->h_vlan_TCI.
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* The vlan_hdr->h_vlan_encapsulated_proto take over role as
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* ethhdr->h_proto.
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*/
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p[3] = p[2];
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p[2] = p[1];
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p[1] = p[0];
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}
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SEC("xdp_vlan_remove_outer2")
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int xdp_prognum3(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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struct ethhdr *orig_eth = data;
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struct parse_pkt pkt = { 0 };
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if (!parse_eth_frame(orig_eth, data_end, &pkt))
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return XDP_ABORTED;
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/* Skip packet if no outer VLAN was detected */
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if (pkt.vlan_outer_offset == 0)
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return XDP_PASS;
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/* Simply shift down MAC addrs 4 bytes, overwrite h_proto + TCI */
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shift_mac_4bytes_32bit(data);
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/* Move start of packet header seen by Linux kernel stack */
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bpf_xdp_adjust_head(ctx, VLAN_HDR_SZ);
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return XDP_PASS;
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}
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/*=====================================
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* BELOW: TC-hook based ebpf programs
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* ====================================
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* The TC-clsact eBPF programs (currently) need to be attach via TC commands
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*/
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SEC("tc_vlan_push")
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int _tc_progA(struct __sk_buff *ctx)
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{
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bpf_skb_vlan_push(ctx, bpf_htons(ETH_P_8021Q), TESTVLAN);
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return TC_ACT_OK;
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}
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/*
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Commands to setup TC to use above bpf prog:
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export ROOTDEV=ixgbe2
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export FILE=xdp_vlan01_kern.o
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# Re-attach clsact to clear/flush existing role
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tc qdisc del dev $ROOTDEV clsact 2> /dev/null ;\
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tc qdisc add dev $ROOTDEV clsact
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# Attach BPF prog EGRESS
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tc filter add dev $ROOTDEV egress \
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prio 1 handle 1 bpf da obj $FILE sec tc_vlan_push
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tc filter show dev $ROOTDEV egress
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*/
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@ -0,0 +1,195 @@
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#!/bin/bash
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TESTNAME=xdp_vlan
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usage() {
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echo "Testing XDP + TC eBPF VLAN manipulations: $TESTNAME"
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echo ""
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echo "Usage: $0 [-vfh]"
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echo " -v | --verbose : Verbose"
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echo " --flush : Flush before starting (e.g. after --interactive)"
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echo " --interactive : Keep netns setup running after test-run"
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echo ""
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}
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cleanup()
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{
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local status=$?
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if [ "$status" = "0" ]; then
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echo "selftests: $TESTNAME [PASS]";
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else
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echo "selftests: $TESTNAME [FAILED]";
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fi
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if [ -n "$INTERACTIVE" ]; then
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echo "Namespace setup still active explore with:"
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echo " ip netns exec ns1 bash"
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echo " ip netns exec ns2 bash"
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exit $status
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fi
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set +e
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ip link del veth1 2> /dev/null
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ip netns del ns1 2> /dev/null
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ip netns del ns2 2> /dev/null
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}
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# Using external program "getopt" to get --long-options
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OPTIONS=$(getopt -o hvfi: \
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--long verbose,flush,help,interactive,debug -- "$@")
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if (( $? != 0 )); then
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usage
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echo "selftests: $TESTNAME [FAILED] Error calling getopt, unknown option?"
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exit 2
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fi
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eval set -- "$OPTIONS"
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## --- Parse command line arguments / parameters ---
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while true; do
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case "$1" in
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-v | --verbose)
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export VERBOSE=yes
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shift
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;;
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-i | --interactive | --debug )
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INTERACTIVE=yes
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shift
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;;
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-f | --flush )
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cleanup
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shift
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;;
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-- )
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shift
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break
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;;
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-h | --help )
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usage;
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echo "selftests: $TESTNAME [SKIP] usage help info requested"
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exit 0
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;;
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* )
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shift
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break
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;;
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esac
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done
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if [ "$EUID" -ne 0 ]; then
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echo "selftests: $TESTNAME [FAILED] need root privileges"
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exit 1
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fi
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ip link set dev lo xdp off 2>/dev/null > /dev/null
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if [ $? -ne 0 ];then
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echo "selftests: $TESTNAME [SKIP] need ip xdp support"
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exit 0
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fi
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# Interactive mode likely require us to cleanup netns
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if [ -n "$INTERACTIVE" ]; then
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ip link del veth1 2> /dev/null
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ip netns del ns1 2> /dev/null
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ip netns del ns2 2> /dev/null
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fi
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# Exit on failure
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set -e
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# Some shell-tools dependencies
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which ip > /dev/null
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which tc > /dev/null
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which ethtool > /dev/null
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# Make rest of shell verbose, showing comments as doc/info
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if [ -n "$VERBOSE" ]; then
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set -v
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fi
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# Create two namespaces
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ip netns add ns1
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ip netns add ns2
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# Run cleanup if failing or on kill
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trap cleanup 0 2 3 6 9
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# Create veth pair
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ip link add veth1 type veth peer name veth2
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# Move veth1 and veth2 into the respective namespaces
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ip link set veth1 netns ns1
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ip link set veth2 netns ns2
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# NOTICE: XDP require VLAN header inside packet payload
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# - Thus, disable VLAN offloading driver features
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# - For veth REMEMBER TX side VLAN-offload
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#
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# Disable rx-vlan-offload (mostly needed on ns1)
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ip netns exec ns1 ethtool -K veth1 rxvlan off
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ip netns exec ns2 ethtool -K veth2 rxvlan off
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#
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# Disable tx-vlan-offload (mostly needed on ns2)
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ip netns exec ns2 ethtool -K veth2 txvlan off
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ip netns exec ns1 ethtool -K veth1 txvlan off
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|
||||
export IPADDR1=100.64.41.1
|
||||
export IPADDR2=100.64.41.2
|
||||
|
||||
# In ns1/veth1 add IP-addr on plain net_device
|
||||
ip netns exec ns1 ip addr add ${IPADDR1}/24 dev veth1
|
||||
ip netns exec ns1 ip link set veth1 up
|
||||
|
||||
# In ns2/veth2 create VLAN device
|
||||
export VLAN=4011
|
||||
export DEVNS2=veth2
|
||||
ip netns exec ns2 ip link add link $DEVNS2 name $DEVNS2.$VLAN type vlan id $VLAN
|
||||
ip netns exec ns2 ip addr add ${IPADDR2}/24 dev $DEVNS2.$VLAN
|
||||
ip netns exec ns2 ip link set $DEVNS2 up
|
||||
ip netns exec ns2 ip link set $DEVNS2.$VLAN up
|
||||
|
||||
# Bringup lo in netns (to avoids confusing people using --interactive)
|
||||
ip netns exec ns1 ip link set lo up
|
||||
ip netns exec ns2 ip link set lo up
|
||||
|
||||
# At this point, the hosts cannot reach each-other,
|
||||
# because ns2 are using VLAN tags on the packets.
|
||||
|
||||
ip netns exec ns2 sh -c 'ping -W 1 -c 1 100.64.41.1 || echo "Okay ping fails"'
|
||||
|
||||
|
||||
# Now we can use the test_xdp_vlan.c program to pop/push these VLAN tags
|
||||
# ----------------------------------------------------------------------
|
||||
# In ns1: ingress use XDP to remove VLAN tags
|
||||
export DEVNS1=veth1
|
||||
export FILE=test_xdp_vlan.o
|
||||
|
||||
# First test: Remove VLAN by setting VLAN ID 0, using "xdp_vlan_change"
|
||||
export XDP_PROG=xdp_vlan_change
|
||||
ip netns exec ns1 ip link set $DEVNS1 xdp object $FILE section $XDP_PROG
|
||||
|
||||
# In ns1: egress use TC to add back VLAN tag 4011
|
||||
# (del cmd)
|
||||
# tc qdisc del dev $DEVNS1 clsact 2> /dev/null
|
||||
#
|
||||
ip netns exec ns1 tc qdisc add dev $DEVNS1 clsact
|
||||
ip netns exec ns1 tc filter add dev $DEVNS1 egress \
|
||||
prio 1 handle 1 bpf da obj $FILE sec tc_vlan_push
|
||||
|
||||
# Now the namespaces can reach each-other, test with ping:
|
||||
ip netns exec ns2 ping -W 2 -c 3 $IPADDR1
|
||||
ip netns exec ns1 ping -W 2 -c 3 $IPADDR2
|
||||
|
||||
# Second test: Replace xdp prog, that fully remove vlan header
|
||||
#
|
||||
# Catch kernel bug for generic-XDP, that does didn't allow us to
|
||||
# remove a VLAN header, because skb->protocol still contain VLAN
|
||||
# ETH_P_8021Q indication, and this cause overwriting of our changes.
|
||||
#
|
||||
export XDP_PROG=xdp_vlan_remove_outer2
|
||||
ip netns exec ns1 ip link set $DEVNS1 xdp off
|
||||
ip netns exec ns1 ip link set $DEVNS1 xdp object $FILE section $XDP_PROG
|
||||
|
||||
# Now the namespaces should still be able reach each-other, test with ping:
|
||||
ip netns exec ns2 ping -W 2 -c 3 $IPADDR1
|
||||
ip netns exec ns1 ping -W 2 -c 3 $IPADDR2
|
||||
Loading…
Reference in New Issue