"Robert P. J. Day" | 63fc1a9 | 2006-07-02 19:47:05 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 2 | /* |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 3 | * This program is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU General Public License |
| 5 | * as published by the Free Software Foundation; either version |
| 6 | * 2 of the License, or (at your option) any later version. |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 7 | * |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 9 | */ |
| 10 | |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 11 | #include <sys/socket.h> |
Eric Andersen | 0f08e53 | 2003-06-20 09:05:00 +0000 | [diff] [blame] | 12 | #include <sys/uio.h> |
| 13 | |
Denis Vlasenko | fad2b86 | 2007-05-31 22:16:38 +0000 | [diff] [blame] | 14 | #include "libbb.h" |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 15 | #include "libnetlink.h" |
| 16 | |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 17 | void FAST_FUNC xrtnl_open(struct rtnl_handle *rth/*, unsigned subscriptions*/) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 18 | { |
Eric Andersen | d78aea8 | 2006-01-30 18:00:02 +0000 | [diff] [blame] | 19 | socklen_t addr_len; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 20 | |
Denis Vlasenko | a771e7c | 2009-04-21 23:48:38 +0000 | [diff] [blame] | 21 | memset(rth, 0, sizeof(*rth)); |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 22 | rth->fd = xsocket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 23 | rth->local.nl_family = AF_NETLINK; |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 24 | /*rth->local.nl_groups = subscriptions;*/ |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 25 | |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 26 | xbind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local)); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 27 | addr_len = sizeof(rth->local); |
Denis Vlasenko | a771e7c | 2009-04-21 23:48:38 +0000 | [diff] [blame] | 28 | getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len); |
| 29 | |
| 30 | /* too much paranoia |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 31 | if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0) |
Bernhard Reutner-Fischer | d73cbd3 | 2008-07-21 14:41:33 +0000 | [diff] [blame] | 32 | bb_perror_msg_and_die("getsockname"); |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 33 | if (addr_len != sizeof(rth->local)) |
| 34 | bb_error_msg_and_die("wrong address length %d", addr_len); |
| 35 | if (rth->local.nl_family != AF_NETLINK) |
| 36 | bb_error_msg_and_die("wrong address family %d", rth->local.nl_family); |
Denis Vlasenko | a771e7c | 2009-04-21 23:48:38 +0000 | [diff] [blame] | 37 | */ |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 38 | rth->seq = time(NULL); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 39 | } |
| 40 | |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 41 | int FAST_FUNC xrtnl_wilddump_request(struct rtnl_handle *rth, int family, int type) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 42 | { |
| 43 | struct { |
| 44 | struct nlmsghdr nlh; |
| 45 | struct rtgenmsg g; |
| 46 | } req; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 47 | |
| 48 | req.nlh.nlmsg_len = sizeof(req); |
| 49 | req.nlh.nlmsg_type = type; |
| 50 | req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST; |
| 51 | req.nlh.nlmsg_pid = 0; |
| 52 | req.nlh.nlmsg_seq = rth->dump = ++rth->seq; |
| 53 | req.g.rtgen_family = family; |
| 54 | |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 55 | return rtnl_send(rth, (void*)&req, sizeof(req)); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 56 | } |
| 57 | |
Denys Vlasenko | f133471 | 2011-02-09 04:39:09 +0100 | [diff] [blame] | 58 | //TODO: pass rth->fd instead of full rth? |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 59 | int FAST_FUNC rtnl_send(struct rtnl_handle *rth, char *buf, int len) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 60 | { |
| 61 | struct sockaddr_nl nladdr; |
| 62 | |
| 63 | memset(&nladdr, 0, sizeof(nladdr)); |
| 64 | nladdr.nl_family = AF_NETLINK; |
| 65 | |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 66 | return xsendto(rth->fd, buf, len, (struct sockaddr*)&nladdr, sizeof(nladdr)); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 67 | } |
| 68 | |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 69 | int FAST_FUNC rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 70 | { |
| 71 | struct nlmsghdr nlh; |
| 72 | struct sockaddr_nl nladdr; |
| 73 | struct iovec iov[2] = { { &nlh, sizeof(nlh) }, { req, len } }; |
| 74 | struct msghdr msg = { |
| 75 | (void*)&nladdr, sizeof(nladdr), |
Denys Vlasenko | fb132e4 | 2010-10-29 11:46:52 +0200 | [diff] [blame] | 76 | iov, 2, |
| 77 | NULL, 0, |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 78 | 0 |
| 79 | }; |
| 80 | |
| 81 | memset(&nladdr, 0, sizeof(nladdr)); |
| 82 | nladdr.nl_family = AF_NETLINK; |
| 83 | |
| 84 | nlh.nlmsg_len = NLMSG_LENGTH(len); |
| 85 | nlh.nlmsg_type = type; |
| 86 | nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST; |
| 87 | nlh.nlmsg_pid = 0; |
| 88 | nlh.nlmsg_seq = rth->dump = ++rth->seq; |
| 89 | |
| 90 | return sendmsg(rth->fd, &msg, 0); |
| 91 | } |
| 92 | |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 93 | static int rtnl_dump_filter(struct rtnl_handle *rth, |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 94 | int (*filter)(const struct sockaddr_nl *, struct nlmsghdr *n, void *) FAST_FUNC, |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 95 | void *arg1/*, |
Bernhard Reutner-Fischer | 921f5df | 2006-11-21 15:36:08 +0000 | [diff] [blame] | 96 | int (*junk)(struct sockaddr_nl *, struct nlmsghdr *n, void *), |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 97 | void *arg2*/) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 98 | { |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 99 | int retval = -1; |
| 100 | char *buf = xmalloc(8*1024); /* avoid big stack buffer */ |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 101 | struct sockaddr_nl nladdr; |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 102 | struct iovec iov = { buf, 8*1024 }; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 103 | |
| 104 | while (1) { |
| 105 | int status; |
| 106 | struct nlmsghdr *h; |
| 107 | |
| 108 | struct msghdr msg = { |
| 109 | (void*)&nladdr, sizeof(nladdr), |
Denys Vlasenko | fb132e4 | 2010-10-29 11:46:52 +0200 | [diff] [blame] | 110 | &iov, 1, |
| 111 | NULL, 0, |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 112 | 0 |
| 113 | }; |
| 114 | |
| 115 | status = recvmsg(rth->fd, &msg, 0); |
| 116 | |
| 117 | if (status < 0) { |
| 118 | if (errno == EINTR) |
| 119 | continue; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 120 | bb_perror_msg("OVERRUN"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 121 | continue; |
| 122 | } |
| 123 | if (status == 0) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 124 | bb_error_msg("EOF on netlink"); |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 125 | goto ret; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 126 | } |
| 127 | if (msg.msg_namelen != sizeof(nladdr)) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 128 | bb_error_msg_and_die("sender address length == %d", msg.msg_namelen); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 129 | } |
| 130 | |
| 131 | h = (struct nlmsghdr*)buf; |
| 132 | while (NLMSG_OK(h, status)) { |
| 133 | int err; |
| 134 | |
Eric Andersen | 6c8161d | 2004-05-05 07:05:32 +0000 | [diff] [blame] | 135 | if (nladdr.nl_pid != 0 || |
| 136 | h->nlmsg_pid != rth->local.nl_pid || |
Denys Vlasenko | 6b9f163 | 2010-01-28 02:24:24 +0100 | [diff] [blame] | 137 | h->nlmsg_seq != rth->dump |
| 138 | ) { |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 139 | // if (junk) { |
| 140 | // err = junk(&nladdr, h, arg2); |
| 141 | // if (err < 0) { |
| 142 | // retval = err; |
| 143 | // goto ret; |
| 144 | // } |
| 145 | // } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 146 | goto skip_it; |
| 147 | } |
| 148 | |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 149 | if (h->nlmsg_type == NLMSG_DONE) { |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 150 | goto ret_0; |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 151 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 152 | if (h->nlmsg_type == NLMSG_ERROR) { |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 153 | struct nlmsgerr *l_err = (struct nlmsgerr*)NLMSG_DATA(h); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 154 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 155 | bb_error_msg("ERROR truncated"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 156 | } else { |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 157 | errno = -l_err->error; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 158 | bb_perror_msg("RTNETLINK answers"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 159 | } |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 160 | goto ret; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 161 | } |
| 162 | err = filter(&nladdr, h, arg1); |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 163 | if (err < 0) { |
| 164 | retval = err; |
| 165 | goto ret; |
| 166 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 167 | |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 168 | skip_it: |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 169 | h = NLMSG_NEXT(h, status); |
| 170 | } |
| 171 | if (msg.msg_flags & MSG_TRUNC) { |
Denis Vlasenko | d3d004d | 2006-10-27 09:02:31 +0000 | [diff] [blame] | 172 | bb_error_msg("message truncated"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 173 | continue; |
| 174 | } |
| 175 | if (status) { |
Denis Vlasenko | d3d004d | 2006-10-27 09:02:31 +0000 | [diff] [blame] | 176 | bb_error_msg_and_die("remnant of size %d!", status); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 177 | } |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 178 | } /* while (1) */ |
| 179 | ret_0: |
| 180 | retval++; /* = 0 */ |
| 181 | ret: |
| 182 | free(buf); |
| 183 | return retval; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 184 | } |
| 185 | |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 186 | int FAST_FUNC xrtnl_dump_filter(struct rtnl_handle *rth, |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 187 | int (*filter)(const struct sockaddr_nl *, struct nlmsghdr *, void *) FAST_FUNC, |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 188 | void *arg1) |
| 189 | { |
| 190 | int ret = rtnl_dump_filter(rth, filter, arg1/*, NULL, NULL*/); |
| 191 | if (ret < 0) |
| 192 | bb_error_msg_and_die("dump terminated"); |
| 193 | return ret; |
| 194 | } |
| 195 | |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 196 | int FAST_FUNC rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 197 | pid_t peer, unsigned groups, |
| 198 | struct nlmsghdr *answer, |
| 199 | int (*junk)(struct sockaddr_nl *, struct nlmsghdr *, void *), |
| 200 | void *jarg) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 201 | { |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 202 | /* bbox doesn't use parameters no. 3, 4, 6, 7, they are stubbed out */ |
| 203 | #define peer 0 |
| 204 | #define groups 0 |
| 205 | #define junk NULL |
| 206 | #define jarg NULL |
| 207 | int retval = -1; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 208 | int status; |
| 209 | unsigned seq; |
| 210 | struct nlmsghdr *h; |
| 211 | struct sockaddr_nl nladdr; |
| 212 | struct iovec iov = { (void*)n, n->nlmsg_len }; |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 213 | char *buf = xmalloc(8*1024); /* avoid big stack buffer */ |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 214 | struct msghdr msg = { |
| 215 | (void*)&nladdr, sizeof(nladdr), |
Denys Vlasenko | fb132e4 | 2010-10-29 11:46:52 +0200 | [diff] [blame] | 216 | &iov, 1, |
| 217 | NULL, 0, |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 218 | 0 |
| 219 | }; |
| 220 | |
| 221 | memset(&nladdr, 0, sizeof(nladdr)); |
| 222 | nladdr.nl_family = AF_NETLINK; |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 223 | // nladdr.nl_pid = peer; |
| 224 | // nladdr.nl_groups = groups; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 225 | |
| 226 | n->nlmsg_seq = seq = ++rtnl->seq; |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 227 | if (answer == NULL) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 228 | n->nlmsg_flags |= NLM_F_ACK; |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 229 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 230 | status = sendmsg(rtnl->fd, &msg, 0); |
| 231 | |
| 232 | if (status < 0) { |
Denys Vlasenko | 6331cf0 | 2009-11-13 09:08:27 +0100 | [diff] [blame] | 233 | bb_perror_msg("can't talk to rtnetlink"); |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 234 | goto ret; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | iov.iov_base = buf; |
| 238 | |
| 239 | while (1) { |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 240 | iov.iov_len = 8*1024; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 241 | status = recvmsg(rtnl->fd, &msg, 0); |
| 242 | |
| 243 | if (status < 0) { |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 244 | if (errno == EINTR) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 245 | continue; |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 246 | } |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 247 | bb_perror_msg("OVERRUN"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 248 | continue; |
| 249 | } |
| 250 | if (status == 0) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 251 | bb_error_msg("EOF on netlink"); |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 252 | goto ret; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 253 | } |
| 254 | if (msg.msg_namelen != sizeof(nladdr)) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 255 | bb_error_msg_and_die("sender address length == %d", msg.msg_namelen); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 256 | } |
Denis Vlasenko | 6b06cb8 | 2008-05-15 21:30:45 +0000 | [diff] [blame] | 257 | for (h = (struct nlmsghdr*)buf; status >= (int)sizeof(*h); ) { |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 258 | // int l_err; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 259 | int len = h->nlmsg_len; |
| 260 | int l = len - sizeof(*h); |
| 261 | |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 262 | if (l < 0 || len > status) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 263 | if (msg.msg_flags & MSG_TRUNC) { |
Denis Vlasenko | d3d004d | 2006-10-27 09:02:31 +0000 | [diff] [blame] | 264 | bb_error_msg("truncated message"); |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 265 | goto ret; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 266 | } |
Denis Vlasenko | d3d004d | 2006-10-27 09:02:31 +0000 | [diff] [blame] | 267 | bb_error_msg_and_die("malformed message: len=%d!", len); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 268 | } |
| 269 | |
Eric Andersen | 6c8161d | 2004-05-05 07:05:32 +0000 | [diff] [blame] | 270 | if (nladdr.nl_pid != peer || |
| 271 | h->nlmsg_pid != rtnl->local.nl_pid || |
Denys Vlasenko | 6b9f163 | 2010-01-28 02:24:24 +0100 | [diff] [blame] | 272 | h->nlmsg_seq != seq |
| 273 | ) { |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 274 | // if (junk) { |
| 275 | // l_err = junk(&nladdr, h, jarg); |
| 276 | // if (l_err < 0) { |
| 277 | // retval = l_err; |
| 278 | // goto ret; |
| 279 | // } |
| 280 | // } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 281 | continue; |
| 282 | } |
| 283 | |
| 284 | if (h->nlmsg_type == NLMSG_ERROR) { |
| 285 | struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h); |
Denis Vlasenko | 6b06cb8 | 2008-05-15 21:30:45 +0000 | [diff] [blame] | 286 | if (l < (int)sizeof(struct nlmsgerr)) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 287 | bb_error_msg("ERROR truncated"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 288 | } else { |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 289 | errno = - err->error; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 290 | if (errno == 0) { |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 291 | if (answer) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 292 | memcpy(answer, h, h->nlmsg_len); |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 293 | } |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 294 | goto ret_0; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 295 | } |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 296 | bb_perror_msg("RTNETLINK answers"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 297 | } |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 298 | goto ret; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 299 | } |
| 300 | if (answer) { |
| 301 | memcpy(answer, h, h->nlmsg_len); |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 302 | goto ret_0; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 303 | } |
| 304 | |
Denis Vlasenko | d3d004d | 2006-10-27 09:02:31 +0000 | [diff] [blame] | 305 | bb_error_msg("unexpected reply!"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 306 | |
| 307 | status -= NLMSG_ALIGN(len); |
| 308 | h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len)); |
| 309 | } |
| 310 | if (msg.msg_flags & MSG_TRUNC) { |
Denis Vlasenko | d3d004d | 2006-10-27 09:02:31 +0000 | [diff] [blame] | 311 | bb_error_msg("message truncated"); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 312 | continue; |
| 313 | } |
| 314 | if (status) { |
Denis Vlasenko | d3d004d | 2006-10-27 09:02:31 +0000 | [diff] [blame] | 315 | bb_error_msg_and_die("remnant of size %d!", status); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 316 | } |
Denis Vlasenko | 8723a94 | 2007-12-02 06:30:57 +0000 | [diff] [blame] | 317 | } /* while (1) */ |
| 318 | ret_0: |
| 319 | retval++; /* = 0 */ |
| 320 | ret: |
| 321 | free(buf); |
| 322 | return retval; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 323 | } |
| 324 | |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 325 | int FAST_FUNC addattr32(struct nlmsghdr *n, int maxlen, int type, uint32_t data) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 326 | { |
| 327 | int len = RTA_LENGTH(4); |
| 328 | struct rtattr *rta; |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 329 | |
| 330 | if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 331 | return -1; |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 332 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 333 | rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len)); |
| 334 | rta->rta_type = type; |
| 335 | rta->rta_len = len; |
Denis Vlasenko | efb545b | 2008-12-08 22:56:18 +0000 | [diff] [blame] | 336 | move_to_unaligned32(RTA_DATA(rta), data); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 337 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len; |
| 338 | return 0; |
| 339 | } |
| 340 | |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 341 | int FAST_FUNC addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 342 | { |
| 343 | int len = RTA_LENGTH(alen); |
| 344 | struct rtattr *rta; |
| 345 | |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 346 | if ((int)(NLMSG_ALIGN(n->nlmsg_len) + len) > maxlen) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 347 | return -1; |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 348 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 349 | rta = (struct rtattr*)(((char*)n) + NLMSG_ALIGN(n->nlmsg_len)); |
| 350 | rta->rta_type = type; |
| 351 | rta->rta_len = len; |
| 352 | memcpy(RTA_DATA(rta), data, alen); |
| 353 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + len; |
| 354 | return 0; |
| 355 | } |
| 356 | |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 357 | int FAST_FUNC rta_addattr32(struct rtattr *rta, int maxlen, int type, uint32_t data) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 358 | { |
| 359 | int len = RTA_LENGTH(4); |
| 360 | struct rtattr *subrta; |
| 361 | |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 362 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 363 | return -1; |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 364 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 365 | subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len)); |
| 366 | subrta->rta_type = type; |
| 367 | subrta->rta_len = len; |
Denis Vlasenko | efb545b | 2008-12-08 22:56:18 +0000 | [diff] [blame] | 368 | move_to_unaligned32(RTA_DATA(subrta), data); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 369 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len; |
| 370 | return 0; |
| 371 | } |
| 372 | |
Denis Vlasenko | 0db2c2e | 2008-06-29 06:22:40 +0000 | [diff] [blame] | 373 | int FAST_FUNC rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 374 | { |
| 375 | struct rtattr *subrta; |
| 376 | int len = RTA_LENGTH(alen); |
| 377 | |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 378 | if (RTA_ALIGN(rta->rta_len) + len > maxlen) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 379 | return -1; |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 380 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 381 | subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len)); |
| 382 | subrta->rta_type = type; |
| 383 | subrta->rta_len = len; |
| 384 | memcpy(RTA_DATA(subrta), data, alen); |
| 385 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len; |
| 386 | return 0; |
| 387 | } |
| 388 | |
| 389 | |
Natanael Copa | b78ac5a | 2010-07-23 01:31:24 +0200 | [diff] [blame] | 390 | void FAST_FUNC parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 391 | { |
| 392 | while (RTA_OK(rta, len)) { |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 393 | if (rta->rta_type <= max) { |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 394 | tb[rta->rta_type] = rta; |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 395 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 396 | rta = RTA_NEXT(rta,len); |
| 397 | } |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 398 | if (len) { |
Denis Vlasenko | d3d004d | 2006-10-27 09:02:31 +0000 | [diff] [blame] | 399 | bb_error_msg("deficit %d, rta_len=%d!", len, rta->rta_len); |
Glenn L McGrath | d4de975 | 2002-11-28 12:35:46 +0000 | [diff] [blame] | 400 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 401 | } |