[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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[2725] | 3 | * This program is free software; you can redistribute it and/or
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| 4 | * modify it under the terms of the GNU General Public License
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| 5 | * as published by the Free Software Foundation; either version
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| 6 | * 2 of the License, or (at your option) any later version.
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[821] | 7 | *
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[2725] | 8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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[821] | 9 | */
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| 10 |
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| 11 | #include <sys/socket.h>
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| 12 | #include <sys/uio.h>
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| 13 |
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[1765] | 14 | #include "libbb.h"
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[821] | 15 | #include "libnetlink.h"
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| 16 |
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[2725] | 17 | void FAST_FUNC xrtnl_open(struct rtnl_handle *rth/*, unsigned subscriptions*/)
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[821] | 18 | {
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| 19 | socklen_t addr_len;
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| 20 |
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[2725] | 21 | memset(rth, 0, sizeof(*rth));
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[1765] | 22 | rth->fd = xsocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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[821] | 23 | rth->local.nl_family = AF_NETLINK;
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[1765] | 24 | /*rth->local.nl_groups = subscriptions;*/
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[821] | 25 |
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[1765] | 26 | xbind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local));
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[821] | 27 | addr_len = sizeof(rth->local);
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[2725] | 28 | getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len);
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| 29 |
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| 30 | /* too much paranoia
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[1765] | 31 | if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0)
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[2725] | 32 | bb_perror_msg_and_die("getsockname");
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[1765] | 33 | if (addr_len != sizeof(rth->local))
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| 34 | bb_error_msg_and_die("wrong address length %d", addr_len);
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| 35 | if (rth->local.nl_family != AF_NETLINK)
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| 36 | bb_error_msg_and_die("wrong address family %d", rth->local.nl_family);
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[2725] | 37 | */
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[821] | 38 | rth->seq = time(NULL);
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| 39 | }
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| 40 |
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[2725] | 41 | int FAST_FUNC xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
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[821] | 42 | {
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| 43 | struct {
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| 44 | struct nlmsghdr nlh;
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| 45 | struct rtgenmsg g;
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| 46 | } req;
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| 47 |
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| 48 | req.nlh.nlmsg_len = sizeof(req);
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| 49 | req.nlh.nlmsg_type = type;
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| 50 | req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
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| 51 | req.nlh.nlmsg_pid = 0;
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| 52 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
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| 53 | req.g.rtgen_family = family;
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| 54 |
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[2725] | 55 | return rtnl_send(rth, (void*)&req, sizeof(req));
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[821] | 56 | }
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| 57 |
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[2725] | 58 | int FAST_FUNC rtnl_send(struct rtnl_handle *rth, char *buf, int len)
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[821] | 59 | {
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| 60 | struct sockaddr_nl nladdr;
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| 61 |
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| 62 | memset(&nladdr, 0, sizeof(nladdr));
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| 63 | nladdr.nl_family = AF_NETLINK;
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| 64 |
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[1765] | 65 | return xsendto(rth->fd, buf, len, (struct sockaddr*)&nladdr, sizeof(nladdr));
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[821] | 66 | }
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| 67 |
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[2725] | 68 | int FAST_FUNC rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
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[821] | 69 | {
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| 70 | struct nlmsghdr nlh;
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| 71 | struct sockaddr_nl nladdr;
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| 72 | struct iovec iov[2] = { { &nlh, sizeof(nlh) }, { req, len } };
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| 73 | struct msghdr msg = {
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| 74 | (void*)&nladdr, sizeof(nladdr),
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[2725] | 75 | iov, 2,
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| 76 | NULL, 0,
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[821] | 77 | 0
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| 78 | };
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| 79 |
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| 80 | memset(&nladdr, 0, sizeof(nladdr));
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| 81 | nladdr.nl_family = AF_NETLINK;
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| 82 |
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| 83 | nlh.nlmsg_len = NLMSG_LENGTH(len);
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| 84 | nlh.nlmsg_type = type;
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| 85 | nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
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| 86 | nlh.nlmsg_pid = 0;
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| 87 | nlh.nlmsg_seq = rth->dump = ++rth->seq;
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| 88 |
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| 89 | return sendmsg(rth->fd, &msg, 0);
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| 90 | }
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| 91 |
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[1765] | 92 | static int rtnl_dump_filter(struct rtnl_handle *rth,
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[2725] | 93 | int (*filter)(const struct sockaddr_nl *, struct nlmsghdr *n, void *) FAST_FUNC,
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[1765] | 94 | void *arg1/*,
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| 95 | int (*junk)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
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| 96 | void *arg2*/)
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[821] | 97 | {
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[2725] | 98 | int retval = -1;
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| 99 | char *buf = xmalloc(8*1024); /* avoid big stack buffer */
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[821] | 100 | struct sockaddr_nl nladdr;
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[2725] | 101 | struct iovec iov = { buf, 8*1024 };
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[821] | 102 |
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| 103 | while (1) {
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| 104 | int status;
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| 105 | struct nlmsghdr *h;
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| 106 |
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| 107 | struct msghdr msg = {
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| 108 | (void*)&nladdr, sizeof(nladdr),
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[2725] | 109 | &iov, 1,
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| 110 | NULL, 0,
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[821] | 111 | 0
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| 112 | };
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| 113 |
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| 114 | status = recvmsg(rth->fd, &msg, 0);
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| 115 |
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| 116 | if (status < 0) {
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| 117 | if (errno == EINTR)
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| 118 | continue;
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| 119 | bb_perror_msg("OVERRUN");
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| 120 | continue;
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| 121 | }
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| 122 | if (status == 0) {
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| 123 | bb_error_msg("EOF on netlink");
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[2725] | 124 | goto ret;
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[821] | 125 | }
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| 126 | if (msg.msg_namelen != sizeof(nladdr)) {
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| 127 | bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
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| 128 | }
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| 129 |
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| 130 | h = (struct nlmsghdr*)buf;
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| 131 | while (NLMSG_OK(h, status)) {
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| 132 | int err;
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| 133 |
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| 134 | if (nladdr.nl_pid != 0 ||
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| 135 | h->nlmsg_pid != rth->local.nl_pid ||
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[2725] | 136 | h->nlmsg_seq != rth->dump
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| 137 | ) {
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| 138 | // if (junk) {
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| 139 | // err = junk(&nladdr, h, arg2);
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| 140 | // if (err < 0) {
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| 141 | // retval = err;
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| 142 | // goto ret;
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| 143 | // }
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| 144 | // }
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[821] | 145 | goto skip_it;
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| 146 | }
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| 147 |
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| 148 | if (h->nlmsg_type == NLMSG_DONE) {
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[2725] | 149 | goto ret_0;
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[821] | 150 | }
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| 151 | if (h->nlmsg_type == NLMSG_ERROR) {
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| 152 | struct nlmsgerr *l_err = (struct nlmsgerr*)NLMSG_DATA(h);
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| 153 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
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| 154 | bb_error_msg("ERROR truncated");
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| 155 | } else {
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| 156 | errno = -l_err->error;
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| 157 | bb_perror_msg("RTNETLINK answers");
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| 158 | }
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[2725] | 159 | goto ret;
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[821] | 160 | }
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| 161 | err = filter(&nladdr, h, arg1);
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[2725] | 162 | if (err < 0) {
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| 163 | retval = err;
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| 164 | goto ret;
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| 165 | }
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[821] | 166 |
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[2725] | 167 | skip_it:
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[821] | 168 | h = NLMSG_NEXT(h, status);
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| 169 | }
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| 170 | if (msg.msg_flags & MSG_TRUNC) {
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[1765] | 171 | bb_error_msg("message truncated");
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[821] | 172 | continue;
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| 173 | }
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| 174 | if (status) {
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[1765] | 175 | bb_error_msg_and_die("remnant of size %d!", status);
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[821] | 176 | }
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[2725] | 177 | } /* while (1) */
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| 178 | ret_0:
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| 179 | retval++; /* = 0 */
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| 180 | ret:
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| 181 | free(buf);
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| 182 | return retval;
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[821] | 183 | }
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| 184 |
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[2725] | 185 | int FAST_FUNC xrtnl_dump_filter(struct rtnl_handle *rth,
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| 186 | int (*filter)(const struct sockaddr_nl *, struct nlmsghdr *, void *) FAST_FUNC,
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[1765] | 187 | void *arg1)
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| 188 | {
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| 189 | int ret = rtnl_dump_filter(rth, filter, arg1/*, NULL, NULL*/);
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| 190 | if (ret < 0)
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| 191 | bb_error_msg_and_die("dump terminated");
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| 192 | return ret;
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| 193 | }
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| 194 |
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[2725] | 195 | int FAST_FUNC rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
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| 196 | pid_t peer, unsigned groups,
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| 197 | struct nlmsghdr *answer,
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| 198 | int (*junk)(struct sockaddr_nl *, struct nlmsghdr *, void *),
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| 199 | void *jarg)
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[821] | 200 | {
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[2725] | 201 | /* bbox doesn't use parameters no. 3, 4, 6, 7, they are stubbed out */
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| 202 | #define peer 0
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| 203 | #define groups 0
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| 204 | #define junk NULL
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| 205 | #define jarg NULL
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| 206 | int retval = -1;
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[821] | 207 | int status;
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| 208 | unsigned seq;
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| 209 | struct nlmsghdr *h;
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| 210 | struct sockaddr_nl nladdr;
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| 211 | struct iovec iov = { (void*)n, n->nlmsg_len };
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[2725] | 212 | char *buf = xmalloc(8*1024); /* avoid big stack buffer */
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[821] | 213 | struct msghdr msg = {
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| 214 | (void*)&nladdr, sizeof(nladdr),
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[2725] | 215 | &iov, 1,
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| 216 | NULL, 0,
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[821] | 217 | 0
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| 218 | };
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| 219 |
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| 220 | memset(&nladdr, 0, sizeof(nladdr));
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| 221 | nladdr.nl_family = AF_NETLINK;
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[2725] | 222 | // nladdr.nl_pid = peer;
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| 223 | // nladdr.nl_groups = groups;
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[821] | 224 |
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| 225 | n->nlmsg_seq = seq = ++rtnl->seq;
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| 226 | if (answer == NULL) {
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| 227 | n->nlmsg_flags |= NLM_F_ACK;
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| 228 | }
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| 229 | status = sendmsg(rtnl->fd, &msg, 0);
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| 230 |
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| 231 | if (status < 0) {
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[2725] | 232 | bb_perror_msg("can't talk to rtnetlink");
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| 233 | goto ret;
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[821] | 234 | }
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| 235 |
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| 236 | iov.iov_base = buf;
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| 237 |
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| 238 | while (1) {
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[2725] | 239 | iov.iov_len = 8*1024;
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[821] | 240 | status = recvmsg(rtnl->fd, &msg, 0);
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| 241 |
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| 242 | if (status < 0) {
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| 243 | if (errno == EINTR) {
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| 244 | continue;
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| 245 | }
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| 246 | bb_perror_msg("OVERRUN");
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| 247 | continue;
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| 248 | }
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| 249 | if (status == 0) {
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| 250 | bb_error_msg("EOF on netlink");
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[2725] | 251 | goto ret;
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[821] | 252 | }
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| 253 | if (msg.msg_namelen != sizeof(nladdr)) {
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| 254 | bb_error_msg_and_die("sender address length == %d", msg.msg_namelen);
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| 255 | }
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[2725] | 256 | for (h = (struct nlmsghdr*)buf; status >= (int)sizeof(*h); ) {
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| 257 | // int l_err;
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[821] | 258 | int len = h->nlmsg_len;
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| 259 | int l = len - sizeof(*h);
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| 260 |
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[2725] | 261 | if (l < 0 || len > status) {
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[821] | 262 | if (msg.msg_flags & MSG_TRUNC) {
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[1765] | 263 | bb_error_msg("truncated message");
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[2725] | 264 | goto ret;
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[821] | 265 | }
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[1765] | 266 | bb_error_msg_and_die("malformed message: len=%d!", len);
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[821] | 267 | }
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| 268 |
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| 269 | if (nladdr.nl_pid != peer ||
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| 270 | h->nlmsg_pid != rtnl->local.nl_pid ||
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[2725] | 271 | h->nlmsg_seq != seq
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| 272 | ) {
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| 273 | // if (junk) {
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| 274 | // l_err = junk(&nladdr, h, jarg);
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| 275 | // if (l_err < 0) {
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| 276 | // retval = l_err;
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| 277 | // goto ret;
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| 278 | // }
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| 279 | // }
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[821] | 280 | continue;
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| 281 | }
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| 282 |
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| 283 | if (h->nlmsg_type == NLMSG_ERROR) {
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| 284 | struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
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[2725] | 285 | if (l < (int)sizeof(struct nlmsgerr)) {
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[821] | 286 | bb_error_msg("ERROR truncated");
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| 287 | } else {
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[2725] | 288 | errno = - err->error;
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[821] | 289 | if (errno == 0) {
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| 290 | if (answer) {
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| 291 | memcpy(answer, h, h->nlmsg_len);
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| 292 | }
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[2725] | 293 | goto ret_0;
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[821] | 294 | }
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| 295 | bb_perror_msg("RTNETLINK answers");
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| 296 | }
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[2725] | 297 | goto ret;
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[821] | 298 | }
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| 299 | if (answer) {
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| 300 | memcpy(answer, h, h->nlmsg_len);
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[2725] | 301 | goto ret_0;
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[821] | 302 | }
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| 303 |
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[1765] | 304 | bb_error_msg("unexpected reply!");
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[821] | 305 |
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| 306 | status -= NLMSG_ALIGN(len);
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| 307 | h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
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| 308 | }
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| 309 | if (msg.msg_flags & MSG_TRUNC) {
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[1765] | 310 | bb_error_msg("message truncated");
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[821] | 311 | continue;
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| 312 | }
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| 313 | if (status) {
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[1765] | 314 | bb_error_msg_and_die("remnant of size %d!", status);
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[821] | 315 | }
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[2725] | 316 | } /* while (1) */
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| 317 | ret_0:
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| 318 | retval++; /* = 0 */
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| 319 | ret:
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| 320 | free(buf);
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| 321 | return retval;
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[821] | 322 | }
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| 323 |
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[2725] | 324 | int FAST_FUNC addattr32(struct nlmsghdr *n, int maxlen, int type, uint32_t data)
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[821] | 325 | {
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| 326 | int len = RTA_LENGTH(4);
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| 327 | struct rtattr *rta;
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[2725] | 328 |
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| 329 | if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) {
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[821] | 330 | return -1;
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[2725] | 331 | }
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[821] | 332 | rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
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| 333 | rta->rta_type = type;
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| 334 | rta->rta_len = len;
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[2725] | 335 | move_to_unaligned32(RTA_DATA(rta), data);
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[821] | 336 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
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| 337 | return 0;
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| 338 | }
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| 339 |
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[2725] | 340 | int FAST_FUNC addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen)
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[821] | 341 | {
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| 342 | int len = RTA_LENGTH(alen);
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| 343 | struct rtattr *rta;
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| 344 |
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[2725] | 345 | if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) {
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[821] | 346 | return -1;
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[2725] | 347 | }
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[821] | 348 | rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len));
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| 349 | rta->rta_type = type;
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| 350 | rta->rta_len = len;
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| 351 | memcpy(RTA_DATA(rta), data, alen);
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| 352 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len;
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| 353 | return 0;
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| 354 | }
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| 355 |
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[2725] | 356 | int FAST_FUNC rta_addattr32(struct rtattr *rta, int maxlen, int type, uint32_t data)
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[821] | 357 | {
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| 358 | int len = RTA_LENGTH(4);
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| 359 | struct rtattr *subrta;
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| 360 |
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| 361 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
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| 362 | return -1;
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| 363 | }
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| 364 | subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
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| 365 | subrta->rta_type = type;
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| 366 | subrta->rta_len = len;
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[2725] | 367 | move_to_unaligned32(RTA_DATA(subrta), data);
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[821] | 368 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
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| 369 | return 0;
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| 370 | }
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| 371 |
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[2725] | 372 | int FAST_FUNC rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen)
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[821] | 373 | {
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| 374 | struct rtattr *subrta;
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| 375 | int len = RTA_LENGTH(alen);
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| 376 |
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| 377 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
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| 378 | return -1;
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| 379 | }
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| 380 | subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
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| 381 | subrta->rta_type = type;
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| 382 | subrta->rta_len = len;
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| 383 | memcpy(RTA_DATA(subrta), data, alen);
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| 384 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
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| 385 | return 0;
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| 386 | }
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| 387 |
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| 388 |
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[2725] | 389 | void FAST_FUNC parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
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[821] | 390 | {
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| 391 | while (RTA_OK(rta, len)) {
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| 392 | if (rta->rta_type <= max) {
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| 393 | tb[rta->rta_type] = rta;
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| 394 | }
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| 395 | rta = RTA_NEXT(rta,len);
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| 396 | }
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| 397 | if (len) {
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[1765] | 398 | bb_error_msg("deficit %d, rta_len=%d!", len, rta->rta_len);
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[821] | 399 | }
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| 400 | }
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