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// SPDX-License-Identifier: GPL-2.0
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#include <stdio.h>
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#include <string.h>
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#include <rt_names.h>
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#include <errno.h>
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#include <linux/genetlink.h>
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#include <linux/mptcp.h>
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#include "utils.h"
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#include "ip_common.h"
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#include "libgenl.h"
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#include "json_print.h"
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: ip mptcp endpoint add ADDRESS [ dev NAME ] [ id ID ]\n"
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" [ FLAG-LIST ]\n"
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" ip mptcp endpoint delete id ID\n"
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" ip mptcp endpoint show [ id ID ]\n"
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" ip mptcp endpoint flush\n"
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" ip mptcp limits set [ subflows NR ] [ add_addr_accepted NR ]\n"
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" ip mptcp limits show\n"
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"FLAG-LIST := [ FLAG-LIST ] FLAG\n"
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"FLAG := [ signal | subflow | backup ]\n");
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exit(-1);
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}
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/* netlink socket */
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static struct rtnl_handle genl_rth = { .fd = -1 };
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static int genl_family = -1;
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#define MPTCP_BUFLEN 4096
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#define MPTCP_REQUEST(_req, _cmd, _flags) \
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GENL_REQUEST(_req, MPTCP_BUFLEN, genl_family, 0, \
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MPTCP_PM_VER, _cmd, _flags)
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/* Mapping from argument to address flag mask */
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static const struct {
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const char *name;
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unsigned long value;
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} mptcp_addr_flag_names[] = {
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{ "signal", MPTCP_PM_ADDR_FLAG_SIGNAL },
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{ "subflow", MPTCP_PM_ADDR_FLAG_SUBFLOW },
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{ "backup", MPTCP_PM_ADDR_FLAG_BACKUP },
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};
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static void print_mptcp_addr_flags(unsigned int flags)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(mptcp_addr_flag_names); i++) {
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unsigned long mask = mptcp_addr_flag_names[i].value;
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if (flags & mask) {
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print_string(PRINT_FP, NULL, "%s ",
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mptcp_addr_flag_names[i].name);
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print_bool(PRINT_JSON,
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mptcp_addr_flag_names[i].name, NULL, true);
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}
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flags &= ~mask;
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}
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if (flags) {
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/* unknown flags */
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SPRINT_BUF(b1);
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snprintf(b1, sizeof(b1), "%02x", flags);
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print_string(PRINT_ANY, "rawflags", "rawflags %s ", b1);
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}
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}
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static int get_flags(const char *arg, __u32 *flags)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(mptcp_addr_flag_names); i++) {
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if (strcmp(arg, mptcp_addr_flag_names[i].name))
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continue;
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*flags |= mptcp_addr_flag_names[i].value;
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return 0;
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}
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return -1;
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}
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static int mptcp_parse_opt(int argc, char **argv, struct nlmsghdr *n,
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bool adding)
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{
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struct rtattr *attr_addr;
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bool addr_set = false;
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inet_prefix address;
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bool id_set = false;
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__u32 index = 0;
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__u32 flags = 0;
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__u8 id = 0;
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ll_init_map(&rth);
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while (argc > 0) {
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if (get_flags(*argv, &flags) == 0) {
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} else if (matches(*argv, "id") == 0) {
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NEXT_ARG();
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if (get_u8(&id, *argv, 0))
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invarg("invalid ID\n", *argv);
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id_set = true;
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} else if (matches(*argv, "dev") == 0) {
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const char *ifname;
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NEXT_ARG();
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ifname = *argv;
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if (check_ifname(ifname))
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invarg("invalid interface name\n", ifname);
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index = ll_name_to_index(ifname);
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if (!index)
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invarg("device does not exist\n", ifname);
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} else if (get_addr(&address, *argv, AF_UNSPEC) == 0) {
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addr_set = true;
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} else {
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invarg("unknown argument", *argv);
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}
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NEXT_ARG_FWD();
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}
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if (!addr_set && adding)
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missarg("ADDRESS");
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if (!id_set && !adding)
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missarg("ID");
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attr_addr = addattr_nest(n, MPTCP_BUFLEN,
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MPTCP_PM_ATTR_ADDR | NLA_F_NESTED);
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if (id_set)
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addattr8(n, MPTCP_BUFLEN, MPTCP_PM_ADDR_ATTR_ID, id);
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if (flags)
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addattr32(n, MPTCP_BUFLEN, MPTCP_PM_ADDR_ATTR_FLAGS, flags);
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if (index)
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addattr32(n, MPTCP_BUFLEN, MPTCP_PM_ADDR_ATTR_IF_IDX, index);
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if (addr_set) {
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int type;
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addattr16(n, MPTCP_BUFLEN, MPTCP_PM_ADDR_ATTR_FAMILY,
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address.family);
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type = address.family == AF_INET ? MPTCP_PM_ADDR_ATTR_ADDR4 :
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MPTCP_PM_ADDR_ATTR_ADDR6;
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addattr_l(n, MPTCP_BUFLEN, type, &address.data,
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address.bytelen);
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}
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addattr_nest_end(n, attr_addr);
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return 0;
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}
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static int mptcp_addr_modify(int argc, char **argv, int cmd)
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{
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MPTCP_REQUEST(req, cmd, NLM_F_REQUEST);
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int ret;
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ret = mptcp_parse_opt(argc, argv, &req.n, cmd == MPTCP_PM_CMD_ADD_ADDR);
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if (ret)
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return ret;
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if (rtnl_talk(&genl_rth, &req.n, NULL) < 0)
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return -2;
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return 0;
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}
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static int print_mptcp_addrinfo(struct rtattr *addrinfo)
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{
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struct rtattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1];
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__u8 family = AF_UNSPEC, addr_attr_type;
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const char *ifname;
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unsigned int flags;
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int index;
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__u16 id;
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parse_rtattr_nested(tb, MPTCP_PM_ADDR_ATTR_MAX, addrinfo);
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open_json_object(NULL);
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if (tb[MPTCP_PM_ADDR_ATTR_FAMILY])
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family = rta_getattr_u8(tb[MPTCP_PM_ADDR_ATTR_FAMILY]);
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addr_attr_type = family == AF_INET ? MPTCP_PM_ADDR_ATTR_ADDR4 :
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MPTCP_PM_ADDR_ATTR_ADDR6;
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if (tb[addr_attr_type]) {
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print_string(PRINT_ANY, "address", "%s ",
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format_host_rta(family, tb[addr_attr_type]));
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}
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if (tb[MPTCP_PM_ADDR_ATTR_ID]) {
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id = rta_getattr_u8(tb[MPTCP_PM_ADDR_ATTR_ID]);
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print_uint(PRINT_ANY, "id", "id %u ", id);
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}
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if (tb[MPTCP_PM_ADDR_ATTR_FLAGS]) {
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flags = rta_getattr_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]);
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print_mptcp_addr_flags(flags);
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}
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if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) {
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index = rta_getattr_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]);
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ifname = index ? ll_index_to_name(index) : NULL;
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if (ifname)
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print_string(PRINT_ANY, "dev", "dev %s ", ifname);
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}
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close_json_object();
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print_string(PRINT_FP, NULL, "\n", NULL);
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fflush(stdout);
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return 0;
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}
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static int print_mptcp_addr(struct nlmsghdr *n, void *arg)
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{
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struct rtattr *tb[MPTCP_PM_ATTR_MAX + 1];
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struct genlmsghdr *ghdr;
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struct rtattr *addrinfo;
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int len = n->nlmsg_len;
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if (n->nlmsg_type != genl_family)
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return 0;
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len -= NLMSG_LENGTH(GENL_HDRLEN);
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if (len < 0)
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return -1;
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ghdr = NLMSG_DATA(n);
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parse_rtattr_flags(tb, MPTCP_PM_ATTR_MAX, (void *) ghdr + GENL_HDRLEN,
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len, NLA_F_NESTED);
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addrinfo = tb[MPTCP_PM_ATTR_ADDR];
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if (!addrinfo)
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return -1;
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ll_init_map(&rth);
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return print_mptcp_addrinfo(addrinfo);
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}
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static int mptcp_addr_dump(void)
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{
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MPTCP_REQUEST(req, MPTCP_PM_CMD_GET_ADDR, NLM_F_REQUEST | NLM_F_DUMP);
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if (rtnl_send(&genl_rth, &req.n, req.n.nlmsg_len) < 0) {
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perror("Cannot send show request");
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exit(1);
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}
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new_json_obj(json);
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if (rtnl_dump_filter(&genl_rth, print_mptcp_addr, stdout) < 0) {
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fprintf(stderr, "Dump terminated\n");
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delete_json_obj();
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fflush(stdout);
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return -2;
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}
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close_json_object();
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fflush(stdout);
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return 0;
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}
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static int mptcp_addr_show(int argc, char **argv)
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{
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MPTCP_REQUEST(req, MPTCP_PM_CMD_GET_ADDR, NLM_F_REQUEST);
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struct nlmsghdr *answer;
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int ret;
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if (argc <= 0)
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return mptcp_addr_dump();
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ret = mptcp_parse_opt(argc, argv, &req.n, false);
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if (ret)
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return ret;
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if (rtnl_talk(&genl_rth, &req.n, &answer) < 0)
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return -2;
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return print_mptcp_addr(answer, stdout);
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}
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static int mptcp_addr_flush(int argc, char **argv)
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{
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MPTCP_REQUEST(req, MPTCP_PM_CMD_FLUSH_ADDRS, NLM_F_REQUEST);
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3880ab |
if (rtnl_talk(&genl_rth, &req.n, NULL) < 0)
|
|
Packit Service |
3880ab |
return -2;
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
return 0;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
static int mptcp_parse_limit(int argc, char **argv, struct nlmsghdr *n)
|
|
Packit Service |
3880ab |
{
|
|
Packit Service |
3880ab |
bool set_rcv_add_addrs = false;
|
|
Packit Service |
3880ab |
bool set_subflows = false;
|
|
Packit Service |
3880ab |
__u32 rcv_add_addrs = 0;
|
|
Packit Service |
3880ab |
__u32 subflows = 0;
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
while (argc > 0) {
|
|
Packit Service |
3880ab |
if (matches(*argv, "subflows") == 0) {
|
|
Packit Service |
3880ab |
NEXT_ARG();
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (get_u32(&subflows, *argv, 0))
|
|
Packit Service |
3880ab |
invarg("invalid subflows\n", *argv);
|
|
Packit Service |
3880ab |
set_subflows = true;
|
|
Packit Service |
3880ab |
} else if (matches(*argv, "add_addr_accepted") == 0) {
|
|
Packit Service |
3880ab |
NEXT_ARG();
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (get_u32(&rcv_add_addrs, *argv, 0))
|
|
Packit Service |
3880ab |
invarg("invalid add_addr_accepted\n", *argv);
|
|
Packit Service |
3880ab |
set_rcv_add_addrs = true;
|
|
Packit Service |
3880ab |
} else {
|
|
Packit Service |
3880ab |
invarg("unknown limit", *argv);
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
NEXT_ARG_FWD();
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (set_rcv_add_addrs)
|
|
Packit Service |
3880ab |
addattr32(n, MPTCP_BUFLEN, MPTCP_PM_ATTR_RCV_ADD_ADDRS,
|
|
Packit Service |
3880ab |
rcv_add_addrs);
|
|
Packit Service |
3880ab |
if (set_subflows)
|
|
Packit Service |
3880ab |
addattr32(n, MPTCP_BUFLEN, MPTCP_PM_ATTR_SUBFLOWS, subflows);
|
|
Packit Service |
3880ab |
return set_rcv_add_addrs || set_subflows;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
static int print_mptcp_limit(struct nlmsghdr *n, void *arg)
|
|
Packit Service |
3880ab |
{
|
|
Packit Service |
3880ab |
struct rtattr *tb[MPTCP_PM_ATTR_MAX + 1];
|
|
Packit Service |
3880ab |
struct genlmsghdr *ghdr;
|
|
Packit Service |
3880ab |
int len = n->nlmsg_len;
|
|
Packit Service |
3880ab |
__u32 val;
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (n->nlmsg_type != genl_family)
|
|
Packit Service |
3880ab |
return 0;
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
len -= NLMSG_LENGTH(GENL_HDRLEN);
|
|
Packit Service |
3880ab |
if (len < 0)
|
|
Packit Service |
3880ab |
return -1;
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
ghdr = NLMSG_DATA(n);
|
|
Packit Service |
3880ab |
parse_rtattr(tb, MPTCP_PM_ATTR_MAX, (void *) ghdr + GENL_HDRLEN, len);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
open_json_object(NULL);
|
|
Packit Service |
3880ab |
if (tb[MPTCP_PM_ATTR_RCV_ADD_ADDRS]) {
|
|
Packit Service |
3880ab |
val = rta_getattr_u32(tb[MPTCP_PM_ATTR_RCV_ADD_ADDRS]);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
print_uint(PRINT_ANY, "add_addr_accepted",
|
|
Packit Service |
3880ab |
"add_addr_accepted %d ", val);
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (tb[MPTCP_PM_ATTR_SUBFLOWS]) {
|
|
Packit Service |
3880ab |
val = rta_getattr_u32(tb[MPTCP_PM_ATTR_SUBFLOWS]);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
print_uint(PRINT_ANY, "subflows", "subflows %d ", val);
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
print_string(PRINT_FP, NULL, "%s", "\n");
|
|
Packit Service |
3880ab |
fflush(stdout);
|
|
Packit Service |
3880ab |
close_json_object();
|
|
Packit Service |
3880ab |
return 0;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
static int mptcp_limit_get_set(int argc, char **argv, int cmd)
|
|
Packit Service |
3880ab |
{
|
|
Packit Service |
3880ab |
bool do_get = cmd == MPTCP_PM_CMD_GET_LIMITS;
|
|
Packit Service |
3880ab |
MPTCP_REQUEST(req, cmd, NLM_F_REQUEST);
|
|
Packit Service |
3880ab |
struct nlmsghdr *answer;
|
|
Packit Service |
3880ab |
int ret;
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
ret = mptcp_parse_limit(argc, argv, &req.n);
|
|
Packit Service |
3880ab |
if (ret < 0)
|
|
Packit Service |
3880ab |
return -1;
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (rtnl_talk(&genl_rth, &req.n, do_get ? &answer : NULL) < 0)
|
|
Packit Service |
3880ab |
return -2;
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (do_get)
|
|
Packit Service |
3880ab |
return print_mptcp_limit(answer, stdout);
|
|
Packit Service |
3880ab |
return 0;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
int do_mptcp(int argc, char **argv)
|
|
Packit Service |
3880ab |
{
|
|
Packit Service |
3880ab |
if (argc == 0)
|
|
Packit Service |
3880ab |
usage();
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (matches(*argv, "help") == 0)
|
|
Packit Service |
3880ab |
usage();
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (genl_init_handle(&genl_rth, MPTCP_PM_NAME, &genl_family))
|
|
Packit Service |
3880ab |
exit(1);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (matches(*argv, "endpoint") == 0) {
|
|
Packit Service |
3880ab |
NEXT_ARG_FWD();
|
|
Packit Service |
3880ab |
if (argc == 0)
|
|
Packit Service |
3880ab |
return mptcp_addr_show(0, NULL);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (matches(*argv, "add") == 0)
|
|
Packit Service |
3880ab |
return mptcp_addr_modify(argc-1, argv+1,
|
|
Packit Service |
3880ab |
MPTCP_PM_CMD_ADD_ADDR);
|
|
Packit Service |
3880ab |
if (matches(*argv, "delete") == 0)
|
|
Packit Service |
3880ab |
return mptcp_addr_modify(argc-1, argv+1,
|
|
Packit Service |
3880ab |
MPTCP_PM_CMD_DEL_ADDR);
|
|
Packit Service |
3880ab |
if (matches(*argv, "show") == 0)
|
|
Packit Service |
3880ab |
return mptcp_addr_show(argc-1, argv+1);
|
|
Packit Service |
3880ab |
if (matches(*argv, "flush") == 0)
|
|
Packit Service |
3880ab |
return mptcp_addr_flush(argc-1, argv+1);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
goto unknown;
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (matches(*argv, "limits") == 0) {
|
|
Packit Service |
3880ab |
NEXT_ARG_FWD();
|
|
Packit Service |
3880ab |
if (argc == 0)
|
|
Packit Service |
3880ab |
return mptcp_limit_get_set(0, NULL,
|
|
Packit Service |
3880ab |
MPTCP_PM_CMD_GET_LIMITS);
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
if (matches(*argv, "set") == 0)
|
|
Packit Service |
3880ab |
return mptcp_limit_get_set(argc-1, argv+1,
|
|
Packit Service |
3880ab |
MPTCP_PM_CMD_SET_LIMITS);
|
|
Packit Service |
3880ab |
if (matches(*argv, "show") == 0)
|
|
Packit Service |
3880ab |
return mptcp_limit_get_set(argc-1, argv+1,
|
|
Packit Service |
3880ab |
MPTCP_PM_CMD_GET_LIMITS);
|
|
Packit Service |
3880ab |
}
|
|
Packit Service |
3880ab |
|
|
Packit Service |
3880ab |
unknown:
|
|
Packit Service |
3880ab |
fprintf(stderr, "Command \"%s\" is unknown, try \"ip mptcp help\".\n",
|
|
Packit Service |
3880ab |
*argv);
|
|
Packit Service |
3880ab |
exit(-1);
|
|
Packit Service |
3880ab |
}
|