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// SPDX-License-Identifier: GPL-2.0+
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/*
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* mnl_utils.c Helpers for working with libmnl.
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*/
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#include <errno.h>
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#include <string.h>
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#include <time.h>
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#include <libmnl/libmnl.h>
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#include <linux/genetlink.h>
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#include "libnetlink.h"
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#include "mnl_utils.h"
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#include "utils.h"
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struct mnl_socket *mnlu_socket_open(int bus)
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{
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struct mnl_socket *nl;
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int one = 1;
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nl = mnl_socket_open(bus);
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if (nl == NULL)
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return NULL;
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mnl_socket_setsockopt(nl, NETLINK_CAP_ACK, &one, sizeof(one));
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mnl_socket_setsockopt(nl, NETLINK_EXT_ACK, &one, sizeof(one));
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if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0)
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goto err_bind;
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return nl;
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err_bind:
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mnl_socket_close(nl);
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return NULL;
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}
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struct nlmsghdr *mnlu_msg_prepare(void *buf, uint32_t nlmsg_type, uint16_t flags,
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void *extra_header, size_t extra_header_size)
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{
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struct nlmsghdr *nlh;
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void *eh;
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nlh = mnl_nlmsg_put_header(buf);
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nlh->nlmsg_type = nlmsg_type;
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nlh->nlmsg_flags = flags;
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nlh->nlmsg_seq = time(NULL);
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eh = mnl_nlmsg_put_extra_header(nlh, extra_header_size);
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memcpy(eh, extra_header, extra_header_size);
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return nlh;
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}
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static int mnlu_cb_noop(const struct nlmsghdr *nlh, void *data)
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{
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return MNL_CB_OK;
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}
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static int mnlu_cb_error(const struct nlmsghdr *nlh, void *data)
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{
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const struct nlmsgerr *err = mnl_nlmsg_get_payload(nlh);
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/* Netlink subsystems returns the errno value with different signess */
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if (err->error < 0)
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errno = -err->error;
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else
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errno = err->error;
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if (nl_dump_ext_ack(nlh, NULL))
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return MNL_CB_ERROR;
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return err->error == 0 ? MNL_CB_STOP : MNL_CB_ERROR;
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}
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static int mnlu_cb_stop(const struct nlmsghdr *nlh, void *data)
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{
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int len = *(int *)NLMSG_DATA(nlh);
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if (len < 0) {
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errno = -len;
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nl_dump_ext_ack_done(nlh, len);
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return MNL_CB_ERROR;
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}
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return MNL_CB_STOP;
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}
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static mnl_cb_t mnlu_cb_array[NLMSG_MIN_TYPE] = {
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[NLMSG_NOOP] = mnlu_cb_noop,
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[NLMSG_ERROR] = mnlu_cb_error,
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[NLMSG_DONE] = mnlu_cb_stop,
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[NLMSG_OVERRUN] = mnlu_cb_noop,
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};
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int mnlu_socket_recv_run(struct mnl_socket *nl, unsigned int seq, void *buf, size_t buf_size,
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mnl_cb_t cb, void *data)
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{
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unsigned int portid = mnl_socket_get_portid(nl);
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int err;
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do {
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err = mnl_socket_recvfrom(nl, buf, buf_size);
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if (err <= 0)
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break;
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err = mnl_cb_run2(buf, err, seq, portid,
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cb, data, mnlu_cb_array,
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ARRAY_SIZE(mnlu_cb_array));
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} while (err > 0);
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return err;
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}
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static int get_family_id_attr_cb(const struct nlattr *attr, void *data)
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{
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int type = mnl_attr_get_type(attr);
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const struct nlattr **tb = data;
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if (mnl_attr_type_valid(attr, CTRL_ATTR_MAX) < 0)
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return MNL_CB_ERROR;
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if (type == CTRL_ATTR_FAMILY_ID &&
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mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
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return MNL_CB_ERROR;
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tb[type] = attr;
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return MNL_CB_OK;
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}
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static int get_family_id_cb(const struct nlmsghdr *nlh, void *data)
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{
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struct genlmsghdr *genl = mnl_nlmsg_get_payload(nlh);
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struct nlattr *tb[CTRL_ATTR_MAX + 1] = {};
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uint32_t *p_id = data;
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mnl_attr_parse(nlh, sizeof(*genl), get_family_id_attr_cb, tb);
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if (!tb[CTRL_ATTR_FAMILY_ID])
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return MNL_CB_ERROR;
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*p_id = mnl_attr_get_u16(tb[CTRL_ATTR_FAMILY_ID]);
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return MNL_CB_OK;
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}
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static int family_get(struct mnlu_gen_socket *nlg, const char *family_name)
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{
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struct genlmsghdr hdr = {};
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struct nlmsghdr *nlh;
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int err;
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hdr.cmd = CTRL_CMD_GETFAMILY;
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hdr.version = 0x1;
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nlh = mnlu_msg_prepare(nlg->buf, GENL_ID_CTRL,
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NLM_F_REQUEST | NLM_F_ACK,
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&hdr, sizeof(hdr));
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mnl_attr_put_strz(nlh, CTRL_ATTR_FAMILY_NAME, family_name);
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err = mnl_socket_sendto(nlg->nl, nlh, nlh->nlmsg_len);
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if (err < 0)
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return err;
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err = mnlu_socket_recv_run(nlg->nl, nlh->nlmsg_seq, nlg->buf,
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MNL_SOCKET_BUFFER_SIZE,
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get_family_id_cb, &nlg->family);
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return err;
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}
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int mnlu_gen_socket_open(struct mnlu_gen_socket *nlg, const char *family_name,
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uint8_t version)
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{
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int err;
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nlg->buf = malloc(MNL_SOCKET_BUFFER_SIZE);
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if (!nlg->buf)
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goto err_buf_alloc;
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nlg->nl = mnlu_socket_open(NETLINK_GENERIC);
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if (!nlg->nl)
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goto err_socket_open;
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err = family_get(nlg, family_name);
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if (err)
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goto err_socket;
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return 0;
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err_socket:
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mnl_socket_close(nlg->nl);
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err_socket_open:
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free(nlg->buf);
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err_buf_alloc:
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return -1;
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}
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void mnlu_gen_socket_close(struct mnlu_gen_socket *nlg)
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{
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mnl_socket_close(nlg->nl);
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free(nlg->buf);
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}
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struct nlmsghdr *mnlu_gen_socket_cmd_prepare(struct mnlu_gen_socket *nlg,
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uint8_t cmd, uint16_t flags)
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{
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struct genlmsghdr hdr = {};
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struct nlmsghdr *nlh;
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hdr.cmd = cmd;
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hdr.version = nlg->version;
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nlh = mnlu_msg_prepare(nlg->buf, nlg->family, flags, &hdr, sizeof(hdr));
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nlg->seq = nlh->nlmsg_seq;
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return nlh;
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}
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int mnlu_gen_socket_sndrcv(struct mnlu_gen_socket *nlg, const struct nlmsghdr *nlh,
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mnl_cb_t data_cb, void *data)
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{
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int err;
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err = mnl_socket_sendto(nlg->nl, nlh, nlh->nlmsg_len);
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if (err < 0) {
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perror("Failed to send data");
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return -errno;
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}
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err = mnlu_socket_recv_run(nlg->nl, nlh->nlmsg_seq, nlg->buf,
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MNL_SOCKET_BUFFER_SIZE,
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data_cb, data);
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if (err < 0) {
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fprintf(stderr, "kernel answers: %s\n", strerror(errno));
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return -errno;
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}
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return 0;
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}
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