Merge branch 'af_xdp-fixes'
Björn Töpel says: ==================== William found two bugs, when doing socket teardown within the same process. The first issue was an invalid munmap call, and the second one was an invalid XSKMAP cleanup. Both resulted in that the process kept references to the socket, which was not correctly cleaned up. When a new socket was created, the bind() call would fail, since the old socket was still lingering, refusing to give up the queue on the netdev. More details can be found in the individual commits. Thanks, Björn ==================== Reviewed-by: Jonathan Lemon <jonathan.lemon@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov
commit
ec1c8fa04f
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@ -248,8 +248,7 @@ int xsk_umem__create(struct xsk_umem **umem_ptr, void *umem_area, __u64 size,
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return 0;
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out_mmap:
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munmap(umem->fill,
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off.fr.desc + umem->config.fill_size * sizeof(__u64));
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munmap(map, off.fr.desc + umem->config.fill_size * sizeof(__u64));
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out_socket:
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close(umem->fd);
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out_umem_alloc:
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@ -388,21 +387,17 @@ static void xsk_delete_bpf_maps(struct xsk_socket *xsk)
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{
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close(xsk->qidconf_map_fd);
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close(xsk->xsks_map_fd);
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xsk->qidconf_map_fd = -1;
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xsk->xsks_map_fd = -1;
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}
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static int xsk_update_bpf_maps(struct xsk_socket *xsk, int qidconf_value,
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int xsks_value)
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static int xsk_lookup_bpf_maps(struct xsk_socket *xsk)
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{
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bool qidconf_map_updated = false, xsks_map_updated = false;
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__u32 i, *map_ids, num_maps, prog_len = sizeof(struct bpf_prog_info);
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__u32 map_len = sizeof(struct bpf_map_info);
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struct bpf_prog_info prog_info = {};
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__u32 prog_len = sizeof(prog_info);
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struct bpf_map_info map_info;
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__u32 map_len = sizeof(map_info);
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__u32 *map_ids;
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int reset_value = 0;
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__u32 num_maps;
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unsigned int i;
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int err;
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int fd, err;
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err = bpf_obj_get_info_by_fd(xsk->prog_fd, &prog_info, &prog_len);
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if (err)
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@ -423,66 +418,71 @@ static int xsk_update_bpf_maps(struct xsk_socket *xsk, int qidconf_value,
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goto out_map_ids;
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for (i = 0; i < prog_info.nr_map_ids; i++) {
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int fd;
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if (xsk->qidconf_map_fd != -1 && xsk->xsks_map_fd != -1)
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break;
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fd = bpf_map_get_fd_by_id(map_ids[i]);
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if (fd < 0) {
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err = -errno;
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goto out_maps;
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}
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if (fd < 0)
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continue;
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err = bpf_obj_get_info_by_fd(fd, &map_info, &map_len);
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if (err)
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goto out_maps;
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if (!strcmp(map_info.name, "qidconf_map")) {
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err = bpf_map_update_elem(fd, &xsk->queue_id,
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&qidconf_value, 0);
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if (err)
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goto out_maps;
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qidconf_map_updated = true;
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xsk->qidconf_map_fd = fd;
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} else if (!strcmp(map_info.name, "xsks_map")) {
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err = bpf_map_update_elem(fd, &xsk->queue_id,
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&xsks_value, 0);
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if (err)
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goto out_maps;
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xsks_map_updated = true;
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xsk->xsks_map_fd = fd;
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if (err) {
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close(fd);
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continue;
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}
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if (qidconf_map_updated && xsks_map_updated)
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break;
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}
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if (!strcmp(map_info.name, "qidconf_map")) {
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xsk->qidconf_map_fd = fd;
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continue;
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}
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if (!(qidconf_map_updated && xsks_map_updated)) {
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err = -ENOENT;
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goto out_maps;
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if (!strcmp(map_info.name, "xsks_map")) {
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xsk->xsks_map_fd = fd;
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continue;
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}
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close(fd);
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}
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err = 0;
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goto out_success;
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if (xsk->qidconf_map_fd < 0 || xsk->xsks_map_fd < 0) {
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err = -ENOENT;
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xsk_delete_bpf_maps(xsk);
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}
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out_maps:
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if (qidconf_map_updated)
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(void)bpf_map_update_elem(xsk->qidconf_map_fd, &xsk->queue_id,
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&reset_value, 0);
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if (xsks_map_updated)
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(void)bpf_map_update_elem(xsk->xsks_map_fd, &xsk->queue_id,
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&reset_value, 0);
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out_success:
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if (qidconf_map_updated)
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close(xsk->qidconf_map_fd);
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if (xsks_map_updated)
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close(xsk->xsks_map_fd);
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out_map_ids:
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free(map_ids);
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return err;
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}
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static void xsk_clear_bpf_maps(struct xsk_socket *xsk)
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{
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int qid = false;
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(void)bpf_map_update_elem(xsk->qidconf_map_fd, &xsk->queue_id, &qid, 0);
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(void)bpf_map_delete_elem(xsk->xsks_map_fd, &xsk->queue_id);
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}
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static int xsk_set_bpf_maps(struct xsk_socket *xsk)
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{
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int qid = true, fd = xsk->fd, err;
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err = bpf_map_update_elem(xsk->qidconf_map_fd, &xsk->queue_id, &qid, 0);
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if (err)
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goto out;
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err = bpf_map_update_elem(xsk->xsks_map_fd, &xsk->queue_id, &fd, 0);
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if (err)
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goto out;
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return 0;
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out:
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xsk_clear_bpf_maps(xsk);
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return err;
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}
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static int xsk_setup_xdp_prog(struct xsk_socket *xsk)
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{
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bool prog_attached = false;
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__u32 prog_id = 0;
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int err;
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@ -492,7 +492,6 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk)
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return err;
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if (!prog_id) {
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prog_attached = true;
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err = xsk_create_bpf_maps(xsk);
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if (err)
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return err;
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@ -502,20 +501,21 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk)
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goto out_maps;
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} else {
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xsk->prog_fd = bpf_prog_get_fd_by_id(prog_id);
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err = xsk_lookup_bpf_maps(xsk);
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if (err)
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goto out_load;
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}
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err = xsk_update_bpf_maps(xsk, true, xsk->fd);
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err = xsk_set_bpf_maps(xsk);
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if (err)
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goto out_load;
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return 0;
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out_load:
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if (prog_attached)
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close(xsk->prog_fd);
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close(xsk->prog_fd);
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out_maps:
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if (prog_attached)
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xsk_delete_bpf_maps(xsk);
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xsk_delete_bpf_maps(xsk);
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return err;
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}
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@ -524,11 +524,11 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
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struct xsk_ring_cons *rx, struct xsk_ring_prod *tx,
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const struct xsk_socket_config *usr_config)
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{
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void *rx_map = NULL, *tx_map = NULL;
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struct sockaddr_xdp sxdp = {};
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struct xdp_mmap_offsets off;
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struct xsk_socket *xsk;
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socklen_t optlen;
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void *map;
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int err;
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if (!umem || !xsk_ptr || !rx || !tx)
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@ -594,40 +594,40 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
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}
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if (rx) {
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map = xsk_mmap(NULL, off.rx.desc +
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xsk->config.rx_size * sizeof(struct xdp_desc),
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PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_POPULATE,
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xsk->fd, XDP_PGOFF_RX_RING);
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if (map == MAP_FAILED) {
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rx_map = xsk_mmap(NULL, off.rx.desc +
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xsk->config.rx_size * sizeof(struct xdp_desc),
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PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_POPULATE,
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xsk->fd, XDP_PGOFF_RX_RING);
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if (rx_map == MAP_FAILED) {
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err = -errno;
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goto out_socket;
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}
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rx->mask = xsk->config.rx_size - 1;
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rx->size = xsk->config.rx_size;
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rx->producer = map + off.rx.producer;
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rx->consumer = map + off.rx.consumer;
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rx->ring = map + off.rx.desc;
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rx->producer = rx_map + off.rx.producer;
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rx->consumer = rx_map + off.rx.consumer;
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rx->ring = rx_map + off.rx.desc;
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}
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xsk->rx = rx;
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if (tx) {
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map = xsk_mmap(NULL, off.tx.desc +
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xsk->config.tx_size * sizeof(struct xdp_desc),
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PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_POPULATE,
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xsk->fd, XDP_PGOFF_TX_RING);
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if (map == MAP_FAILED) {
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tx_map = xsk_mmap(NULL, off.tx.desc +
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xsk->config.tx_size * sizeof(struct xdp_desc),
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PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_POPULATE,
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xsk->fd, XDP_PGOFF_TX_RING);
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if (tx_map == MAP_FAILED) {
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err = -errno;
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goto out_mmap_rx;
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}
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tx->mask = xsk->config.tx_size - 1;
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tx->size = xsk->config.tx_size;
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tx->producer = map + off.tx.producer;
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tx->consumer = map + off.tx.consumer;
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tx->ring = map + off.tx.desc;
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tx->producer = tx_map + off.tx.producer;
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tx->consumer = tx_map + off.tx.consumer;
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tx->ring = tx_map + off.tx.desc;
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tx->cached_cons = xsk->config.tx_size;
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}
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xsk->tx = tx;
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@ -643,6 +643,9 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
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goto out_mmap_tx;
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}
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xsk->qidconf_map_fd = -1;
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xsk->xsks_map_fd = -1;
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if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) {
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err = xsk_setup_xdp_prog(xsk);
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if (err)
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@ -654,13 +657,11 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
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out_mmap_tx:
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if (tx)
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munmap(xsk->tx,
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off.tx.desc +
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munmap(tx_map, off.tx.desc +
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xsk->config.tx_size * sizeof(struct xdp_desc));
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out_mmap_rx:
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if (rx)
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munmap(xsk->rx,
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off.rx.desc +
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munmap(rx_map, off.rx.desc +
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xsk->config.rx_size * sizeof(struct xdp_desc));
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out_socket:
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if (--umem->refcount)
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@ -685,10 +686,12 @@ int xsk_umem__delete(struct xsk_umem *umem)
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optlen = sizeof(off);
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err = getsockopt(umem->fd, SOL_XDP, XDP_MMAP_OFFSETS, &off, &optlen);
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if (!err) {
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munmap(umem->fill->ring,
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off.fr.desc + umem->config.fill_size * sizeof(__u64));
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munmap(umem->comp->ring,
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off.cr.desc + umem->config.comp_size * sizeof(__u64));
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(void)munmap(umem->fill->ring - off.fr.desc,
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off.fr.desc +
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umem->config.fill_size * sizeof(__u64));
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(void)munmap(umem->comp->ring - off.cr.desc,
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off.cr.desc +
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umem->config.comp_size * sizeof(__u64));
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}
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close(umem->fd);
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@ -699,6 +702,7 @@ int xsk_umem__delete(struct xsk_umem *umem)
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void xsk_socket__delete(struct xsk_socket *xsk)
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{
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size_t desc_sz = sizeof(struct xdp_desc);
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struct xdp_mmap_offsets off;
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socklen_t optlen;
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int err;
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@ -706,19 +710,23 @@ void xsk_socket__delete(struct xsk_socket *xsk)
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if (!xsk)
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return;
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(void)xsk_update_bpf_maps(xsk, 0, 0);
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xsk_clear_bpf_maps(xsk);
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xsk_delete_bpf_maps(xsk);
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optlen = sizeof(off);
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err = getsockopt(xsk->fd, SOL_XDP, XDP_MMAP_OFFSETS, &off, &optlen);
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if (!err) {
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if (xsk->rx)
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munmap(xsk->rx->ring,
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off.rx.desc +
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xsk->config.rx_size * sizeof(struct xdp_desc));
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if (xsk->tx)
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munmap(xsk->tx->ring,
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off.tx.desc +
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xsk->config.tx_size * sizeof(struct xdp_desc));
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if (xsk->rx) {
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(void)munmap(xsk->rx->ring - off.rx.desc,
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off.rx.desc +
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xsk->config.rx_size * desc_sz);
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}
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if (xsk->tx) {
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(void)munmap(xsk->tx->ring - off.tx.desc,
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off.tx.desc +
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xsk->config.tx_size * desc_sz);
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}
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}
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xsk->umem->refcount--;
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