diff options
Diffstat (limited to 'samples/bpf/xdpsock_user.c')
| -rw-r--r-- | samples/bpf/xdpsock_user.c | 144 |
1 files changed, 139 insertions, 5 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c index 909f77647deb..74a578f880b5 100644 --- a/samples/bpf/xdpsock_user.c +++ b/samples/bpf/xdpsock_user.c @@ -24,10 +24,12 @@ #include <stdio.h> #include <stdlib.h> #include <string.h> +#include <sys/capability.h> #include <sys/mman.h> #include <sys/resource.h> #include <sys/socket.h> #include <sys/types.h> +#include <sys/un.h> #include <time.h> #include <unistd.h> @@ -96,6 +98,7 @@ static bool opt_need_wakeup = true; static u32 opt_num_xsks = 1; static u32 prog_id; static bool opt_busy_poll; +static bool opt_reduced_cap; struct xsk_ring_stats { unsigned long rx_npkts; @@ -154,6 +157,7 @@ struct xsk_socket_info { static int num_socks; struct xsk_socket_info *xsks[MAX_SOCKS]; +int sock; static unsigned long get_nsecs(void) { @@ -461,6 +465,7 @@ static void *poller(void *arg) static void remove_xdp_program(void) { u32 curr_prog_id = 0; + int cmd = CLOSE_CONN; if (bpf_get_link_xdp_id(opt_ifindex, &curr_prog_id, opt_xdp_flags)) { printf("bpf_get_link_xdp_id failed\n"); @@ -472,6 +477,13 @@ static void remove_xdp_program(void) printf("couldn't find a prog id on a given interface\n"); else printf("program on interface changed, not removing\n"); + + if (opt_reduced_cap) { + if (write(sock, &cmd, sizeof(int)) < 0) { + fprintf(stderr, "Error writing into stream socket: %s", strerror(errno)); + exit(EXIT_FAILURE); + } + } } static void int_exit(int sig) @@ -854,7 +866,7 @@ static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem, xsk->umem = umem; cfg.rx_size = XSK_RING_CONS__DEFAULT_NUM_DESCS; cfg.tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS; - if (opt_num_xsks > 1) + if (opt_num_xsks > 1 || opt_reduced_cap) cfg.libbpf_flags = XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD; else cfg.libbpf_flags = 0; @@ -913,6 +925,7 @@ static struct option long_options[] = { {"app-stats", no_argument, 0, 'a'}, {"irq-string", no_argument, 0, 'I'}, {"busy-poll", no_argument, 0, 'B'}, + {"reduce-cap", no_argument, 0, 'R'}, {0, 0, 0, 0} }; @@ -935,7 +948,7 @@ static void usage(const char *prog) " -m, --no-need-wakeup Turn off use of driver need wakeup flag.\n" " -f, --frame-size=n Set the frame size (must be a power of two in aligned mode, default is %d).\n" " -u, --unaligned Enable unaligned chunk placement\n" - " -M, --shared-umem Enable XDP_SHARED_UMEM\n" + " -M, --shared-umem Enable XDP_SHARED_UMEM (cannot be used with -R)\n" " -F, --force Force loading the XDP prog\n" " -d, --duration=n Duration in secs to run command.\n" " Default: forever.\n" @@ -952,6 +965,7 @@ static void usage(const char *prog) " -a, --app-stats Display application (syscall) statistics.\n" " -I, --irq-string Display driver interrupt statistics for interface associated with irq-string.\n" " -B, --busy-poll Busy poll.\n" + " -R, --reduce-cap Use reduced capabilities (cannot be used with -M)\n" "\n"; fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE, opt_batch_size, MIN_PKT_SIZE, MIN_PKT_SIZE, @@ -967,7 +981,7 @@ static void parse_command_line(int argc, char **argv) opterr = 0; for (;;) { - c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:xQaI:B", + c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:xQaI:BR", long_options, &option_index); if (c == -1) break; @@ -1069,6 +1083,9 @@ static void parse_command_line(int argc, char **argv) case 'B': opt_busy_poll = 1; break; + case 'R': + opt_reduced_cap = true; + break; default: usage(basename(argv[0])); } @@ -1090,6 +1107,11 @@ static void parse_command_line(int argc, char **argv) opt_xsk_frame_size); usage(basename(argv[0])); } + + if (opt_reduced_cap && opt_num_xsks > 1) { + fprintf(stderr, "ERROR: -M and -R cannot be used together\n"); + usage(basename(argv[0])); + } } static void kick_tx(struct xsk_socket_info *xsk) @@ -1487,19 +1509,116 @@ static void apply_setsockopt(struct xsk_socket_info *xsk) exit_with_error(errno); } +static int recv_xsks_map_fd_from_ctrl_node(int sock, int *_fd) +{ + char cms[CMSG_SPACE(sizeof(int))]; + struct cmsghdr *cmsg; + struct msghdr msg; + struct iovec iov; + int value; + int len; + + iov.iov_base = &value; + iov.iov_len = sizeof(int); + + msg.msg_name = 0; + msg.msg_namelen = 0; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_flags = 0; + msg.msg_control = (caddr_t)cms; + msg.msg_controllen = sizeof(cms); + + len = recvmsg(sock, &msg, 0); + + if (len < 0) { + fprintf(stderr, "Recvmsg failed length incorrect.\n"); + return -EINVAL; + } + + if (len == 0) { + fprintf(stderr, "Recvmsg failed no data\n"); + return -EINVAL; + } + + cmsg = CMSG_FIRSTHDR(&msg); + *_fd = *(int *)CMSG_DATA(cmsg); + + return 0; +} + +static int +recv_xsks_map_fd(int *xsks_map_fd) +{ + struct sockaddr_un server; + int err; + + sock = socket(AF_UNIX, SOCK_STREAM, 0); + if (sock < 0) { + fprintf(stderr, "Error opening socket stream: %s", strerror(errno)); + return errno; + } + + server.sun_family = AF_UNIX; + strcpy(server.sun_path, SOCKET_NAME); + + if (connect(sock, (struct sockaddr *)&server, sizeof(struct sockaddr_un)) < 0) { + close(sock); + fprintf(stderr, "Error connecting stream socket: %s", strerror(errno)); + return errno; + } + + err = recv_xsks_map_fd_from_ctrl_node(sock, xsks_map_fd); + if (err) { + fprintf(stderr, "Error %d recieving fd\n", err); + return err; + } + return 0; +} + int main(int argc, char **argv) { + struct __user_cap_header_struct hdr = { _LINUX_CAPABILITY_VERSION_3, 0 }; + struct __user_cap_data_struct data[2] = { { 0 } }; + struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; bool rx = false, tx = false; struct xsk_umem_info *umem; struct bpf_object *obj; + int xsks_map_fd = 0; pthread_t pt; int i, ret; void *bufs; parse_command_line(argc, argv); - if (opt_num_xsks > 1) - load_xdp_program(argv, &obj); + if (opt_reduced_cap) { + if (capget(&hdr, data) < 0) + fprintf(stderr, "Error getting capabilities\n"); + + data->effective &= CAP_TO_MASK(CAP_NET_RAW); + data->permitted &= CAP_TO_MASK(CAP_NET_RAW); + + if (capset(&hdr, data) < 0) + fprintf(stderr, "Setting capabilities failed\n"); + + if (capget(&hdr, data) < 0) { + fprintf(stderr, "Error getting capabilities\n"); + } else { + fprintf(stderr, "Capabilities EFF %x Caps INH %x Caps Per %x\n", + data[0].effective, data[0].inheritable, data[0].permitted); + fprintf(stderr, "Capabilities EFF %x Caps INH %x Caps Per %x\n", + data[1].effective, data[1].inheritable, data[1].permitted); + } + } else { + if (setrlimit(RLIMIT_MEMLOCK, &r)) { + fprintf(stderr, "ERROR: setrlimit(RLIMIT_MEMLOCK) \"%s\"\n", + strerror(errno)); + exit(EXIT_FAILURE); + } + + if (opt_num_xsks > 1) + load_xdp_program(argv, &obj); + } /* Reserve memory for the umem. Use hugepages if unaligned chunk mode */ bufs = mmap(NULL, NUM_FRAMES * opt_xsk_frame_size, @@ -1534,6 +1653,21 @@ int main(int argc, char **argv) if (opt_num_xsks > 1 && opt_bench != BENCH_TXONLY) enter_xsks_into_map(obj); + if (opt_reduced_cap) { + ret = recv_xsks_map_fd(&xsks_map_fd); + if (ret) { + fprintf(stderr, "Error %d receiving xsks_map_fd\n", ret); + exit_with_error(ret); + } + if (xsks[0]->xsk) { + ret = xsk_socket__update_xskmap(xsks[0]->xsk, xsks_map_fd); + if (ret) { + fprintf(stderr, "Update of BPF map failed(%d)\n", ret); + exit_with_error(ret); + } + } + } + signal(SIGINT, int_exit); signal(SIGTERM, int_exit); signal(SIGABRT, int_exit); |