Alexei Starovoitov | 1bc38b8 | 2018-10-05 16:40:00 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 2 | /* Copyright (c) 2018 Facebook */ |
| 3 | |
| 4 | #include <stdlib.h> |
| 5 | #include <memory.h> |
| 6 | #include <unistd.h> |
| 7 | #include <linux/bpf.h> |
| 8 | #include <linux/rtnetlink.h> |
| 9 | #include <sys/socket.h> |
| 10 | #include <errno.h> |
| 11 | #include <time.h> |
| 12 | |
| 13 | #include "bpf.h" |
| 14 | #include "libbpf.h" |
| 15 | #include "nlattr.h" |
| 16 | |
| 17 | #ifndef SOL_NETLINK |
| 18 | #define SOL_NETLINK 270 |
| 19 | #endif |
| 20 | |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 21 | typedef int (*__dump_nlmsg_t)(struct nlmsghdr *nlmsg, libbpf_dump_nlmsg_t, |
Andrey Ignatov | 434fe9d | 2018-10-03 15:26:38 -0700 | [diff] [blame] | 22 | void *cookie); |
| 23 | |
Maciej Fijalkowski | 50db9f0 | 2019-02-01 22:42:29 +0100 | [diff] [blame] | 24 | struct xdp_id_md { |
| 25 | int ifindex; |
| 26 | __u32 flags; |
| 27 | __u32 id; |
| 28 | }; |
| 29 | |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 30 | int libbpf_netlink_open(__u32 *nl_pid) |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 31 | { |
| 32 | struct sockaddr_nl sa; |
| 33 | socklen_t addrlen; |
| 34 | int one = 1, ret; |
| 35 | int sock; |
| 36 | |
| 37 | memset(&sa, 0, sizeof(sa)); |
| 38 | sa.nl_family = AF_NETLINK; |
| 39 | |
| 40 | sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
| 41 | if (sock < 0) |
| 42 | return -errno; |
| 43 | |
| 44 | if (setsockopt(sock, SOL_NETLINK, NETLINK_EXT_ACK, |
| 45 | &one, sizeof(one)) < 0) { |
| 46 | fprintf(stderr, "Netlink error reporting not supported\n"); |
| 47 | } |
| 48 | |
| 49 | if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) { |
| 50 | ret = -errno; |
| 51 | goto cleanup; |
| 52 | } |
| 53 | |
| 54 | addrlen = sizeof(sa); |
| 55 | if (getsockname(sock, (struct sockaddr *)&sa, &addrlen) < 0) { |
| 56 | ret = -errno; |
| 57 | goto cleanup; |
| 58 | } |
| 59 | |
| 60 | if (addrlen != sizeof(sa)) { |
| 61 | ret = -LIBBPF_ERRNO__INTERNAL; |
| 62 | goto cleanup; |
| 63 | } |
| 64 | |
| 65 | *nl_pid = sa.nl_pid; |
| 66 | return sock; |
| 67 | |
| 68 | cleanup: |
| 69 | close(sock); |
| 70 | return ret; |
| 71 | } |
| 72 | |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 73 | static int bpf_netlink_recv(int sock, __u32 nl_pid, int seq, |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 74 | __dump_nlmsg_t _fn, libbpf_dump_nlmsg_t fn, |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 75 | void *cookie) |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 76 | { |
Yonghong Song | 9d0b3c1 | 2018-09-11 14:09:11 -0700 | [diff] [blame] | 77 | bool multipart = true; |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 78 | struct nlmsgerr *err; |
| 79 | struct nlmsghdr *nh; |
| 80 | char buf[4096]; |
| 81 | int len, ret; |
| 82 | |
Yonghong Song | 9d0b3c1 | 2018-09-11 14:09:11 -0700 | [diff] [blame] | 83 | while (multipart) { |
| 84 | multipart = false; |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 85 | len = recv(sock, buf, sizeof(buf), 0); |
| 86 | if (len < 0) { |
| 87 | ret = -errno; |
| 88 | goto done; |
| 89 | } |
| 90 | |
Yonghong Song | 9d0b3c1 | 2018-09-11 14:09:11 -0700 | [diff] [blame] | 91 | if (len == 0) |
| 92 | break; |
| 93 | |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 94 | for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len); |
| 95 | nh = NLMSG_NEXT(nh, len)) { |
| 96 | if (nh->nlmsg_pid != nl_pid) { |
| 97 | ret = -LIBBPF_ERRNO__WRNGPID; |
| 98 | goto done; |
| 99 | } |
| 100 | if (nh->nlmsg_seq != seq) { |
| 101 | ret = -LIBBPF_ERRNO__INVSEQ; |
| 102 | goto done; |
| 103 | } |
Yonghong Song | 9d0b3c1 | 2018-09-11 14:09:11 -0700 | [diff] [blame] | 104 | if (nh->nlmsg_flags & NLM_F_MULTI) |
| 105 | multipart = true; |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 106 | switch (nh->nlmsg_type) { |
| 107 | case NLMSG_ERROR: |
| 108 | err = (struct nlmsgerr *)NLMSG_DATA(nh); |
| 109 | if (!err->error) |
| 110 | continue; |
| 111 | ret = err->error; |
Andrey Ignatov | f04bc8a4 | 2018-10-03 15:26:40 -0700 | [diff] [blame] | 112 | libbpf_nla_dump_errormsg(nh); |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 113 | goto done; |
| 114 | case NLMSG_DONE: |
| 115 | return 0; |
| 116 | default: |
| 117 | break; |
| 118 | } |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 119 | if (_fn) { |
| 120 | ret = _fn(nh, fn, cookie); |
| 121 | if (ret) |
| 122 | return ret; |
| 123 | } |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 124 | } |
| 125 | } |
| 126 | ret = 0; |
| 127 | done: |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags) |
| 132 | { |
| 133 | int sock, seq = 0, ret; |
| 134 | struct nlattr *nla, *nla_xdp; |
| 135 | struct { |
| 136 | struct nlmsghdr nh; |
| 137 | struct ifinfomsg ifinfo; |
| 138 | char attrbuf[64]; |
| 139 | } req; |
| 140 | __u32 nl_pid; |
| 141 | |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 142 | sock = libbpf_netlink_open(&nl_pid); |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 143 | if (sock < 0) |
| 144 | return sock; |
| 145 | |
| 146 | memset(&req, 0, sizeof(req)); |
| 147 | req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)); |
| 148 | req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
| 149 | req.nh.nlmsg_type = RTM_SETLINK; |
| 150 | req.nh.nlmsg_pid = 0; |
| 151 | req.nh.nlmsg_seq = ++seq; |
| 152 | req.ifinfo.ifi_family = AF_UNSPEC; |
| 153 | req.ifinfo.ifi_index = ifindex; |
| 154 | |
| 155 | /* started nested attribute for XDP */ |
| 156 | nla = (struct nlattr *)(((char *)&req) |
| 157 | + NLMSG_ALIGN(req.nh.nlmsg_len)); |
| 158 | nla->nla_type = NLA_F_NESTED | IFLA_XDP; |
| 159 | nla->nla_len = NLA_HDRLEN; |
| 160 | |
| 161 | /* add XDP fd */ |
| 162 | nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len); |
| 163 | nla_xdp->nla_type = IFLA_XDP_FD; |
| 164 | nla_xdp->nla_len = NLA_HDRLEN + sizeof(int); |
| 165 | memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd)); |
| 166 | nla->nla_len += nla_xdp->nla_len; |
| 167 | |
| 168 | /* if user passed in any flags, add those too */ |
| 169 | if (flags) { |
| 170 | nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len); |
| 171 | nla_xdp->nla_type = IFLA_XDP_FLAGS; |
| 172 | nla_xdp->nla_len = NLA_HDRLEN + sizeof(flags); |
| 173 | memcpy((char *)nla_xdp + NLA_HDRLEN, &flags, sizeof(flags)); |
| 174 | nla->nla_len += nla_xdp->nla_len; |
| 175 | } |
| 176 | |
| 177 | req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len); |
| 178 | |
| 179 | if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) { |
| 180 | ret = -errno; |
| 181 | goto cleanup; |
| 182 | } |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 183 | ret = bpf_netlink_recv(sock, nl_pid, seq, NULL, NULL, NULL); |
Yonghong Song | f701077 | 2018-09-05 16:58:04 -0700 | [diff] [blame] | 184 | |
| 185 | cleanup: |
| 186 | close(sock); |
| 187 | return ret; |
| 188 | } |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 189 | |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 190 | static int __dump_link_nlmsg(struct nlmsghdr *nlh, |
| 191 | libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 192 | { |
| 193 | struct nlattr *tb[IFLA_MAX + 1], *attr; |
| 194 | struct ifinfomsg *ifi = NLMSG_DATA(nlh); |
| 195 | int len; |
| 196 | |
| 197 | len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi)); |
| 198 | attr = (struct nlattr *) ((void *) ifi + NLMSG_ALIGN(sizeof(*ifi))); |
Andrey Ignatov | f04bc8a4 | 2018-10-03 15:26:40 -0700 | [diff] [blame] | 199 | if (libbpf_nla_parse(tb, IFLA_MAX, attr, len, NULL) != 0) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 200 | return -LIBBPF_ERRNO__NLPARSE; |
| 201 | |
| 202 | return dump_link_nlmsg(cookie, ifi, tb); |
| 203 | } |
| 204 | |
Maciej Fijalkowski | 50db9f0 | 2019-02-01 22:42:29 +0100 | [diff] [blame] | 205 | static unsigned char get_xdp_id_attr(unsigned char mode, __u32 flags) |
| 206 | { |
| 207 | if (mode != XDP_ATTACHED_MULTI) |
| 208 | return IFLA_XDP_PROG_ID; |
| 209 | if (flags & XDP_FLAGS_DRV_MODE) |
| 210 | return IFLA_XDP_DRV_PROG_ID; |
| 211 | if (flags & XDP_FLAGS_HW_MODE) |
| 212 | return IFLA_XDP_HW_PROG_ID; |
| 213 | if (flags & XDP_FLAGS_SKB_MODE) |
| 214 | return IFLA_XDP_SKB_PROG_ID; |
| 215 | |
| 216 | return IFLA_XDP_UNSPEC; |
| 217 | } |
| 218 | |
| 219 | static int get_xdp_id(void *cookie, void *msg, struct nlattr **tb) |
| 220 | { |
| 221 | struct nlattr *xdp_tb[IFLA_XDP_MAX + 1]; |
| 222 | struct xdp_id_md *xdp_id = cookie; |
| 223 | struct ifinfomsg *ifinfo = msg; |
| 224 | unsigned char mode, xdp_attr; |
| 225 | int ret; |
| 226 | |
| 227 | if (xdp_id->ifindex && xdp_id->ifindex != ifinfo->ifi_index) |
| 228 | return 0; |
| 229 | |
| 230 | if (!tb[IFLA_XDP]) |
| 231 | return 0; |
| 232 | |
| 233 | ret = libbpf_nla_parse_nested(xdp_tb, IFLA_XDP_MAX, tb[IFLA_XDP], NULL); |
| 234 | if (ret) |
| 235 | return ret; |
| 236 | |
| 237 | if (!xdp_tb[IFLA_XDP_ATTACHED]) |
| 238 | return 0; |
| 239 | |
| 240 | mode = libbpf_nla_getattr_u8(xdp_tb[IFLA_XDP_ATTACHED]); |
| 241 | if (mode == XDP_ATTACHED_NONE) |
| 242 | return 0; |
| 243 | |
| 244 | xdp_attr = get_xdp_id_attr(mode, xdp_id->flags); |
| 245 | if (!xdp_attr || !xdp_tb[xdp_attr]) |
| 246 | return 0; |
| 247 | |
| 248 | xdp_id->id = libbpf_nla_getattr_u32(xdp_tb[xdp_attr]); |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags) |
| 254 | { |
| 255 | struct xdp_id_md xdp_id = {}; |
| 256 | int sock, ret; |
| 257 | __u32 nl_pid; |
| 258 | __u32 mask; |
| 259 | |
| 260 | if (flags & ~XDP_FLAGS_MASK) |
| 261 | return -EINVAL; |
| 262 | |
| 263 | /* Check whether the single {HW,DRV,SKB} mode is set */ |
| 264 | flags &= (XDP_FLAGS_SKB_MODE | XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE); |
| 265 | mask = flags - 1; |
| 266 | if (flags && flags & mask) |
| 267 | return -EINVAL; |
| 268 | |
| 269 | sock = libbpf_netlink_open(&nl_pid); |
| 270 | if (sock < 0) |
| 271 | return sock; |
| 272 | |
| 273 | xdp_id.ifindex = ifindex; |
| 274 | xdp_id.flags = flags; |
| 275 | |
| 276 | ret = libbpf_nl_get_link(sock, nl_pid, get_xdp_id, &xdp_id); |
| 277 | if (!ret) |
| 278 | *prog_id = xdp_id.id; |
| 279 | |
| 280 | close(sock); |
| 281 | return ret; |
| 282 | } |
| 283 | |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 284 | int libbpf_nl_get_link(int sock, unsigned int nl_pid, |
| 285 | libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 286 | { |
| 287 | struct { |
| 288 | struct nlmsghdr nlh; |
| 289 | struct ifinfomsg ifm; |
| 290 | } req = { |
| 291 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), |
| 292 | .nlh.nlmsg_type = RTM_GETLINK, |
| 293 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
| 294 | .ifm.ifi_family = AF_PACKET, |
| 295 | }; |
| 296 | int seq = time(NULL); |
| 297 | |
| 298 | req.nlh.nlmsg_seq = seq; |
| 299 | if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0) |
| 300 | return -errno; |
| 301 | |
| 302 | return bpf_netlink_recv(sock, nl_pid, seq, __dump_link_nlmsg, |
| 303 | dump_link_nlmsg, cookie); |
| 304 | } |
| 305 | |
| 306 | static int __dump_class_nlmsg(struct nlmsghdr *nlh, |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 307 | libbpf_dump_nlmsg_t dump_class_nlmsg, |
| 308 | void *cookie) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 309 | { |
| 310 | struct nlattr *tb[TCA_MAX + 1], *attr; |
| 311 | struct tcmsg *t = NLMSG_DATA(nlh); |
| 312 | int len; |
| 313 | |
| 314 | len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t)); |
| 315 | attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t))); |
Andrey Ignatov | f04bc8a4 | 2018-10-03 15:26:40 -0700 | [diff] [blame] | 316 | if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 317 | return -LIBBPF_ERRNO__NLPARSE; |
| 318 | |
| 319 | return dump_class_nlmsg(cookie, t, tb); |
| 320 | } |
| 321 | |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 322 | int libbpf_nl_get_class(int sock, unsigned int nl_pid, int ifindex, |
| 323 | libbpf_dump_nlmsg_t dump_class_nlmsg, void *cookie) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 324 | { |
| 325 | struct { |
| 326 | struct nlmsghdr nlh; |
| 327 | struct tcmsg t; |
| 328 | } req = { |
| 329 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), |
| 330 | .nlh.nlmsg_type = RTM_GETTCLASS, |
| 331 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
| 332 | .t.tcm_family = AF_UNSPEC, |
| 333 | .t.tcm_ifindex = ifindex, |
| 334 | }; |
| 335 | int seq = time(NULL); |
| 336 | |
| 337 | req.nlh.nlmsg_seq = seq; |
| 338 | if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0) |
| 339 | return -errno; |
| 340 | |
| 341 | return bpf_netlink_recv(sock, nl_pid, seq, __dump_class_nlmsg, |
| 342 | dump_class_nlmsg, cookie); |
| 343 | } |
| 344 | |
| 345 | static int __dump_qdisc_nlmsg(struct nlmsghdr *nlh, |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 346 | libbpf_dump_nlmsg_t dump_qdisc_nlmsg, |
| 347 | void *cookie) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 348 | { |
| 349 | struct nlattr *tb[TCA_MAX + 1], *attr; |
| 350 | struct tcmsg *t = NLMSG_DATA(nlh); |
| 351 | int len; |
| 352 | |
| 353 | len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t)); |
| 354 | attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t))); |
Andrey Ignatov | f04bc8a4 | 2018-10-03 15:26:40 -0700 | [diff] [blame] | 355 | if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 356 | return -LIBBPF_ERRNO__NLPARSE; |
| 357 | |
| 358 | return dump_qdisc_nlmsg(cookie, t, tb); |
| 359 | } |
| 360 | |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 361 | int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex, |
| 362 | libbpf_dump_nlmsg_t dump_qdisc_nlmsg, void *cookie) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 363 | { |
| 364 | struct { |
| 365 | struct nlmsghdr nlh; |
| 366 | struct tcmsg t; |
| 367 | } req = { |
| 368 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), |
| 369 | .nlh.nlmsg_type = RTM_GETQDISC, |
| 370 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
| 371 | .t.tcm_family = AF_UNSPEC, |
| 372 | .t.tcm_ifindex = ifindex, |
| 373 | }; |
| 374 | int seq = time(NULL); |
| 375 | |
| 376 | req.nlh.nlmsg_seq = seq; |
| 377 | if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0) |
| 378 | return -errno; |
| 379 | |
| 380 | return bpf_netlink_recv(sock, nl_pid, seq, __dump_qdisc_nlmsg, |
| 381 | dump_qdisc_nlmsg, cookie); |
| 382 | } |
| 383 | |
| 384 | static int __dump_filter_nlmsg(struct nlmsghdr *nlh, |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 385 | libbpf_dump_nlmsg_t dump_filter_nlmsg, |
| 386 | void *cookie) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 387 | { |
| 388 | struct nlattr *tb[TCA_MAX + 1], *attr; |
| 389 | struct tcmsg *t = NLMSG_DATA(nlh); |
| 390 | int len; |
| 391 | |
| 392 | len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t)); |
| 393 | attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t))); |
Andrey Ignatov | f04bc8a4 | 2018-10-03 15:26:40 -0700 | [diff] [blame] | 394 | if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 395 | return -LIBBPF_ERRNO__NLPARSE; |
| 396 | |
| 397 | return dump_filter_nlmsg(cookie, t, tb); |
| 398 | } |
| 399 | |
Andrey Ignatov | aae5778 | 2018-10-03 15:26:39 -0700 | [diff] [blame] | 400 | int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle, |
| 401 | libbpf_dump_nlmsg_t dump_filter_nlmsg, void *cookie) |
Yonghong Song | 36f1678 | 2018-09-05 16:58:05 -0700 | [diff] [blame] | 402 | { |
| 403 | struct { |
| 404 | struct nlmsghdr nlh; |
| 405 | struct tcmsg t; |
| 406 | } req = { |
| 407 | .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)), |
| 408 | .nlh.nlmsg_type = RTM_GETTFILTER, |
| 409 | .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, |
| 410 | .t.tcm_family = AF_UNSPEC, |
| 411 | .t.tcm_ifindex = ifindex, |
| 412 | .t.tcm_parent = handle, |
| 413 | }; |
| 414 | int seq = time(NULL); |
| 415 | |
| 416 | req.nlh.nlmsg_seq = seq; |
| 417 | if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0) |
| 418 | return -errno; |
| 419 | |
| 420 | return bpf_netlink_recv(sock, nl_pid, seq, __dump_filter_nlmsg, |
| 421 | dump_filter_nlmsg, cookie); |
| 422 | } |