// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <network_helpers.h>
#include "xdp_metadata.skel.h"
#include "xdp_metadata2.skel.h"
#include "xdp_metadata.h"
#include "xsk.h"
#include <bpf/btf.h>
#include <linux/errqueue.h>
#include <linux/if_link.h>
#include <linux/net_tstamp.h>
#include <linux/udp.h>
#include <sys/mman.h>
#include <net/if.h>
#include <poll.h>
#define TX_NAME "veTX"
#define RX_NAME "veRX"
#define UDP_PAYLOAD_BYTES 4
#define UDP_SOURCE_PORT 1234
#define AF_XDP_CONSUMER_PORT 8080
#define UMEM_NUM 16
#define UMEM_FRAME_SIZE XSK_UMEM__DEFAULT_FRAME_SIZE
#define UMEM_SIZE (UMEM_FRAME_SIZE * UMEM_NUM)
#define XDP_FLAGS XDP_FLAGS_DRV_MODE
#define QUEUE_ID 0
#define TX_ADDR "10.0.0.1"
#define RX_ADDR "10.0.0.2"
#define PREFIX_LEN "8"
#define FAMILY AF_INET
#define TX_NETNS_NAME "xdp_metadata_tx"
#define RX_NETNS_NAME "xdp_metadata_rx"
#define TX_MAC "00:00:00:00:00:01"
#define RX_MAC "00:00:00:00:00:02"
#define VLAN_ID 59
#define VLAN_PROTO "802.1Q"
#define VLAN_PID htons(ETH_P_8021Q)
#define TX_NAME_VLAN TX_NAME "." TO_STR(VLAN_ID)
#define XDP_RSS_TYPE_L4 BIT(3)
#define VLAN_VID_MASK 0xfff
struct xsk {
void *umem_area;
struct xsk_umem *umem;
struct xsk_ring_prod fill;
struct xsk_ring_cons comp;
struct xsk_ring_prod tx;
struct xsk_ring_cons rx;
struct xsk_socket *socket;
};
static int open_xsk(int ifindex, struct xsk *xsk)
{
int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
const struct xsk_socket_config socket_config = {
.rx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
.tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
.bind_flags = XDP_COPY,
};
const struct xsk_umem_config umem_config = {
.fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
.comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
.frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE,
.flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG | XDP_UMEM_TX_SW_CSUM |
XDP_UMEM_TX_METADATA_LEN,
.tx_metadata_len = sizeof(struct xsk_tx_metadata),
};
__u32 idx;
u64 addr;
int ret;
int i;
xsk->umem_area = mmap(NULL, UMEM_SIZE, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
if (!ASSERT_NEQ(xsk->umem_area, MAP_FAILED, "mmap"))
return -1;
ret = xsk_umem__create(&xsk->umem,
xsk->umem_area, UMEM_SIZE,
&xsk->fill,
&xsk->comp,
&umem_config);
if (!ASSERT_OK(ret, "xsk_umem__create"))
return ret;
ret = xsk_socket__create(&xsk->socket, ifindex, QUEUE_ID,
xsk->umem,
&xsk->rx,
&xsk->tx,
&socket_config);
if (!ASSERT_OK(ret, "xsk_socket__create"))
return ret;
/* First half of umem is for TX. This way address matches 1-to-1
* to the completion queue index.
*/
for (i = 0; i < UMEM_NUM / 2; i++) {
addr = i * UMEM_FRAME_SIZE;
printf("%p: tx_desc[%d] -> %lx\n", xsk, i, addr);
}
/* Second half of umem is for RX. */
ret = xsk_ring_prod__reserve(&xsk->fill, UMEM_NUM / 2, &idx);
if (!ASSERT_EQ(UMEM_NUM / 2, ret, "xsk_ring_prod__reserve"))
return ret;
if (!ASSERT_EQ(idx, 0, "fill idx != 0"))
return -1;
for (i = 0; i < UMEM_NUM / 2; i++) {
addr = (UMEM_NUM / 2 + i) * UMEM_FRAME_SIZE;
printf("%p: rx_desc[%d] -> %lx\n", xsk, i, addr);
*xsk_ring_prod__fill_addr(&xsk->fill, i) = addr;
}
xsk_ring_prod__submit(&xsk->fill, ret);
return 0;
}
static void close_xsk(struct xsk *xsk)
{
if (xsk->umem)
xsk_umem__delete(xsk->umem);
if (xsk->socket)
xsk_socket__delete(xsk->socket);
munmap(xsk->umem_area, UMEM_SIZE);
}
static void ip_csum(struct iphdr *iph)
{
__u32 sum = 0;
__u16 *p;
int i;
iph->check = 0;
p = (void *)iph;
for (i = 0; i < sizeof(*iph) / sizeof(*p); i++)
sum += p[i];
while (sum >> 16)
sum = (sum & 0xffff) + (sum >> 16);
iph->check = ~sum;
}
static int generate_packet(struct xsk *xsk, __u16 dst_port)
{
struct xsk_tx_metadata *meta;
struct xdp_desc *tx_desc;
struct udphdr *udph;
struct ethhdr *eth;
struct iphdr *iph;
void *data;
__u32 idx;
int ret;
ret = xsk_ring_prod__reserve(&xsk->tx, 1, &idx);
if (!ASSERT_EQ(ret, 1, "xsk_ring_prod__reserve"))
return -1;
tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx);
tx_desc->addr = idx % (UMEM_NUM / 2) * UMEM_FRAME_SIZE + sizeof(struct xsk_tx_metadata);
printf("%p: tx_desc[%u]->addr=%llx\n", xsk, idx, tx_desc->addr);
data = xsk_umem__get_data(xsk->umem_area, tx_desc->addr);
meta = data - sizeof(struct xsk_tx_metadata);
memset(meta, 0, sizeof(*meta));
meta->flags = XDP_TXMD_FLAGS_TIMESTAMP;
eth = data;
iph = (void *)(eth + 1);
udph = (void *)(iph + 1);
memcpy(eth->h_dest, "\x00\x00\x00\x00\x00\x02", ETH_ALEN);
memcpy(eth->h_source, "\x00\x00\x00\x00\x00\x01", ETH_ALEN);
eth->h_proto = htons(ETH_P_IP);
iph->version = 0x4;
iph->ihl = 0x5;
iph->tos = 0x9;
iph->tot_len = htons(sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES);
iph->id = 0;
iph->frag_off = 0;
iph->ttl = 0;
iph->protocol = IPPROTO_UDP;
ASSERT_EQ(inet_pton(FAMILY, TX_ADDR, &iph->saddr), 1, "inet_pton(TX_ADDR)");
ASSERT_EQ(inet_pton(FAMILY, RX_ADDR, &iph->daddr), 1, "inet_pton(RX_ADDR)");
ip_csum(iph);
udph->source = htons(UDP_SOURCE_PORT);
udph->dest = htons(dst_port);
udph->len = htons(sizeof(*udph) + UDP_PAYLOAD_BYTES);
udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
ntohs(udph->len), IPPROTO_UDP, 0);
memset(udph + 1, 0xAA, UDP_PAYLOAD_BYTES);
meta->flags |= XDP_TXMD_FLAGS_CHECKSUM;
meta->request.csum_start = sizeof(*eth) + sizeof(*iph);
meta->request.csum_offset = offsetof(struct udphdr, check);
tx_desc->len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES;
tx_desc->options |= XDP_TX_METADATA;
xsk_ring_prod__submit(&xsk->tx, 1);
ret = sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0);
if (!ASSERT_GE(ret, 0, "sendto"))
return ret;
return 0;
}
static int generate_packet_inet(void)
{
char udp_payload[UDP_PAYLOAD_BYTES];
struct sockaddr_in rx_addr;
int sock_fd, err = 0;
/* Build a packet */
memset(udp_payload, 0xAA, UDP_PAYLOAD_BYTES);
rx_addr.sin_addr.s_addr = inet_addr(RX_ADDR);
rx_addr.sin_family = AF_INET;
rx_addr.sin_port = htons(AF_XDP_CONSUMER_PORT);
sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (!ASSERT_GE(sock_fd, 0, "socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)"))
return sock_fd;
err = sendto(sock_fd, udp_payload, UDP_PAYLOAD_BYTES, MSG_DONTWAIT,
(void *)&rx_addr, sizeof(rx_addr));
ASSERT_GE(err, 0, "sendto");
close(sock_fd);
return err;
}
static void complete_tx(struct xsk *xsk)
{
struct xsk_tx_metadata *meta;
__u64 addr;
void *data;
__u32 idx;
if (ASSERT_EQ(xsk_ring_cons__peek(&xsk->comp, 1, &idx), 1, "xsk_ring_cons__peek")) {
addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx);
printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx, addr);
data = xsk_umem__get_data(xsk->umem_area, addr);
meta = data - sizeof(struct xsk_tx_metadata);
ASSERT_NEQ(meta->completion.tx_timestamp, 0, "tx_timestamp");
xsk_ring_cons__release(&xsk->comp, 1);
}
}
static void refill_rx(struct xsk *xsk, __u64 addr)
{
__u32 idx;
if (ASSERT_EQ(xsk_ring_prod__reserve(&xsk->fill, 1, &idx), 1, "xsk_ring_prod__reserve")) {
printf("%p: complete idx=%u addr=%llx\n", xsk, idx, addr);
*xsk_ring_prod__fill_addr(&xsk->fill, idx) = addr;
xsk_ring_prod__submit(&xsk->fill, 1);
}
}
static int verify_xsk_metadata(struct xsk *xsk, bool sent_from_af_xdp)
{
const struct xdp_desc *rx_desc;
struct pollfd fds = {};
struct xdp_meta *meta;
struct udphdr *udph;
struct ethhdr *eth;
struct iphdr *iph;
__u64 comp_addr;
void *data;
__u64 addr;
__u32 idx = 0;
int ret;
ret = recvfrom(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, NULL);
if (!ASSERT_EQ(ret, 0, "recvfrom"))
return -1;
fds.fd = xsk_socket__fd(xsk->socket);
fds.events = POLLIN;
ret = poll(&fds, 1, 1000);
if (!ASSERT_GT(ret, 0, "poll"))
return -1;
ret = xsk_ring_cons__peek(&xsk->rx, 1, &idx);
if (!ASSERT_EQ(ret, 1, "xsk_ring_cons__peek"))
return -2;
rx_desc = xsk_ring_cons__rx_desc(&xsk->rx, idx);
comp_addr = xsk_umem__extract_addr(rx_desc->addr);
addr = xsk_umem__add_offset_to_addr(rx_desc->addr);
printf("%p: rx_desc[%u]->addr=%llx addr=%llx comp_addr=%llx\n",
xsk, idx, rx_desc->addr, addr, comp_addr);
data = xsk_umem__get_data(xsk->umem_area, addr);
/* Make sure we got the packet offset correctly. */
eth = data;
ASSERT_EQ(eth->h_proto, htons(ETH_P_IP), "eth->h_proto");
iph = (void *)(eth + 1);
ASSERT_EQ((int)iph->version, 4, "iph->version");
udph = (void *)(iph + 1);
/* custom metadata */
meta = data - sizeof(struct xdp_meta);
if (!ASSERT_NEQ(meta->rx_timestamp, 0, "rx_timestamp"))
return -1;
if (!ASSERT_NEQ(meta->rx_hash, 0, "rx_hash"))
return -1;
if (!sent_from_af_xdp) {
if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
return -1;
if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
return -1;
if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
return -1;
goto done;
}
ASSERT_EQ(meta->rx_hash_type, 0, "rx_hash_type");
/* checksum offload */
ASSERT_EQ(udph->check, htons(0x721c), "csum");
done:
xsk_ring_cons__release(&xsk->rx, 1);
refill_rx(xsk, comp_addr);
return 0;
}
static void switch_ns_to_rx(struct nstoken **tok)
{
close_netns(*tok);
*tok = open_netns(RX_NETNS_NAME);
}
static void switch_ns_to_tx(struct nstoken **tok)
{
close_netns(*tok);
*tok = open_netns(TX_NETNS_NAME);
}
void test_xdp_metadata(void)
{
struct xdp_metadata2 *bpf_obj2 = NULL;
struct xdp_metadata *bpf_obj = NULL;
struct bpf_program *new_prog, *prog;
struct nstoken *tok = NULL;
__u32 queue_id = QUEUE_ID;
struct bpf_map *prog_arr;
struct xsk tx_xsk = {};
struct xsk rx_xsk = {};
__u32 val, key = 0;
int retries = 10;
int rx_ifindex;
int tx_ifindex;
int sock_fd;
int ret;
/* Setup new networking namespaces, with a veth pair. */
SYS(out, "ip netns add " TX_NETNS_NAME);
SYS(out, "ip netns add " RX_NETNS_NAME);
tok = open_netns(TX_NETNS_NAME);
if (!ASSERT_OK_PTR(tok, "setns"))
goto out;
SYS(out, "ip link add numtxqueues 1 numrxqueues 1 " TX_NAME
" type veth peer " RX_NAME " numtxqueues 1 numrxqueues 1");
SYS(out, "ip link set " RX_NAME " netns " RX_NETNS_NAME);
SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
SYS(out, "ip link set dev " TX_NAME " up");
SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
" type vlan proto " VLAN_PROTO " id " TO_STR(VLAN_ID));
SYS(out, "ip link set dev " TX_NAME_VLAN " up");
SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);
/* Avoid ARP calls */
SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);
switch_ns_to_rx(&tok);
if (!ASSERT_OK_PTR(tok, "setns rx"))
goto out;
SYS(out, "ip link set dev " RX_NAME " address " RX_MAC);
SYS(out, "ip link set dev " RX_NAME " up");
SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);
rx_ifindex = if_nametoindex(RX_NAME);
/* Setup separate AF_XDP for RX interface. */
ret = open_xsk(rx_ifindex, &rx_xsk);
if (!ASSERT_OK(ret, "open_xsk(RX_NAME)"))
goto out;
bpf_obj = xdp_metadata__open();
if (!ASSERT_OK_PTR(bpf_obj, "open skeleton"))
goto out;
prog = bpf_object__find_program_by_name(bpf_obj->obj, "rx");
bpf_program__set_ifindex(prog, rx_ifindex);
bpf_program__set_flags(prog, BPF_F_XDP_DEV_BOUND_ONLY);
if (!ASSERT_OK(xdp_metadata__load(bpf_obj), "load skeleton"))
goto out;
/* Make sure we can't add dev-bound programs to prog maps. */
prog_arr = bpf_object__find_map_by_name(bpf_obj->obj, "prog_arr");
if (!ASSERT_OK_PTR(prog_arr, "no prog_arr map"))
goto out;
val = bpf_program__fd(prog);
if (!ASSERT_ERR(bpf_map__update_elem(prog_arr, &key, sizeof(key),
&val, sizeof(val), BPF_ANY),
"update prog_arr"))
goto out;
/* Attach BPF program to RX interface. */
ret = bpf_xdp_attach(rx_ifindex,
bpf_program__fd(bpf_obj->progs.rx),
XDP_FLAGS, NULL);
if (!ASSERT_GE(ret, 0, "bpf_xdp_attach"))
goto out;
sock_fd = xsk_socket__fd(rx_xsk.socket);
ret = bpf_map_update_elem(bpf_map__fd(bpf_obj->maps.xsk), &queue_id, &sock_fd, 0);
if (!ASSERT_GE(ret, 0, "bpf_map_update_elem"))
goto out;
switch_ns_to_tx(&tok);
if (!ASSERT_OK_PTR(tok, "setns tx"))
goto out;
/* Setup separate AF_XDP for TX interface nad send packet to the RX socket. */
tx_ifindex = if_nametoindex(TX_NAME);
ret = open_xsk(tx_ifindex, &tx_xsk);
if (!ASSERT_OK(ret, "open_xsk(TX_NAME)"))
goto out;
if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
"generate AF_XDP_CONSUMER_PORT"))
goto out;
switch_ns_to_rx(&tok);
if (!ASSERT_OK_PTR(tok, "setns rx"))
goto out;
/* Verify packet sent from AF_XDP has proper metadata. */
if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk, true), 0,
"verify_xsk_metadata"))
goto out;
switch_ns_to_tx(&tok);
if (!ASSERT_OK_PTR(tok, "setns tx"))
goto out;
complete_tx(&tx_xsk);
/* Now check metadata of packet, generated with network stack */
if (!ASSERT_GE(generate_packet_inet(), 0, "generate UDP packet"))
goto out;
switch_ns_to_rx(&tok);
if (!ASSERT_OK_PTR(tok, "setns rx"))
goto out;
if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk, false), 0,
"verify_xsk_metadata"))
goto out;
/* Make sure freplace correctly picks up original bound device
* and doesn't crash.
*/
bpf_obj2 = xdp_metadata2__open();
if (!ASSERT_OK_PTR(bpf_obj2, "open skeleton"))
goto out;
new_prog = bpf_object__find_program_by_name(bpf_obj2->obj, "freplace_rx");
bpf_program__set_attach_target(new_prog, bpf_program__fd(prog), "rx");
if (!ASSERT_OK(xdp_metadata2__load(bpf_obj2), "load freplace skeleton"))
goto out;
if (!ASSERT_OK(xdp_metadata2__attach(bpf_obj2), "attach freplace"))
goto out;
switch_ns_to_tx(&tok);
if (!ASSERT_OK_PTR(tok, "setns tx"))
goto out;
/* Send packet to trigger . */
if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
"generate freplace packet"))
goto out;
switch_ns_to_rx(&tok);
if (!ASSERT_OK_PTR(tok, "setns rx"))
goto out;
while (!retries--) {
if (bpf_obj2->bss->called)
break;
usleep(10);
}
ASSERT_GT(bpf_obj2->bss->called, 0, "not called");
out:
close_xsk(&rx_xsk);
close_xsk(&tx_xsk);
xdp_metadata2__destroy(bpf_obj2);
xdp_metadata__destroy(bpf_obj);
if (tok)
close_netns(tok);
SYS_NOFAIL("ip netns del " RX_NETNS_NAME);
SYS_NOFAIL("ip netns del " TX_NETNS_NAME);
}
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