1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2 /* Copyright (c) 2018 Facebook */
8 #include <linux/rtnetlink.h>
9 #include <sys/socket.h>
15 #include "libbpf_internal.h"
18 /* make sure libbpf doesn't use kernel-only integer typedefs */
19 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
22 #define SOL_NETLINK 270
25 typedef int (*__dump_nlmsg_t)(struct nlmsghdr *nlmsg, libbpf_dump_nlmsg_t,
31 struct xdp_link_info info;
34 int libbpf_netlink_open(__u32 *nl_pid)
36 struct sockaddr_nl sa;
41 memset(&sa, 0, sizeof(sa));
42 sa.nl_family = AF_NETLINK;
44 sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
48 if (setsockopt(sock, SOL_NETLINK, NETLINK_EXT_ACK,
49 &one, sizeof(one)) < 0) {
50 pr_warn("Netlink error reporting not supported\n");
53 if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
59 if (getsockname(sock, (struct sockaddr *)&sa, &addrlen) < 0) {
64 if (addrlen != sizeof(sa)) {
65 ret = -LIBBPF_ERRNO__INTERNAL;
77 static int bpf_netlink_recv(int sock, __u32 nl_pid, int seq,
78 __dump_nlmsg_t _fn, libbpf_dump_nlmsg_t fn,
81 bool multipart = true;
89 len = recv(sock, buf, sizeof(buf), 0);
98 for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len);
99 nh = NLMSG_NEXT(nh, len)) {
100 if (nh->nlmsg_pid != nl_pid) {
101 ret = -LIBBPF_ERRNO__WRNGPID;
104 if (nh->nlmsg_seq != seq) {
105 ret = -LIBBPF_ERRNO__INVSEQ;
108 if (nh->nlmsg_flags & NLM_F_MULTI)
110 switch (nh->nlmsg_type) {
112 err = (struct nlmsgerr *)NLMSG_DATA(nh);
116 libbpf_nla_dump_errormsg(nh);
124 ret = _fn(nh, fn, cookie);
135 int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags)
137 int sock, seq = 0, ret;
138 struct nlattr *nla, *nla_xdp;
141 struct ifinfomsg ifinfo;
146 sock = libbpf_netlink_open(&nl_pid);
150 memset(&req, 0, sizeof(req));
151 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
152 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
153 req.nh.nlmsg_type = RTM_SETLINK;
154 req.nh.nlmsg_pid = 0;
155 req.nh.nlmsg_seq = ++seq;
156 req.ifinfo.ifi_family = AF_UNSPEC;
157 req.ifinfo.ifi_index = ifindex;
159 /* started nested attribute for XDP */
160 nla = (struct nlattr *)(((char *)&req)
161 + NLMSG_ALIGN(req.nh.nlmsg_len));
162 nla->nla_type = NLA_F_NESTED | IFLA_XDP;
163 nla->nla_len = NLA_HDRLEN;
166 nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
167 nla_xdp->nla_type = IFLA_XDP_FD;
168 nla_xdp->nla_len = NLA_HDRLEN + sizeof(int);
169 memcpy((char *)nla_xdp + NLA_HDRLEN, &fd, sizeof(fd));
170 nla->nla_len += nla_xdp->nla_len;
172 /* if user passed in any flags, add those too */
174 nla_xdp = (struct nlattr *)((char *)nla + nla->nla_len);
175 nla_xdp->nla_type = IFLA_XDP_FLAGS;
176 nla_xdp->nla_len = NLA_HDRLEN + sizeof(flags);
177 memcpy((char *)nla_xdp + NLA_HDRLEN, &flags, sizeof(flags));
178 nla->nla_len += nla_xdp->nla_len;
181 req.nh.nlmsg_len += NLA_ALIGN(nla->nla_len);
183 if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
187 ret = bpf_netlink_recv(sock, nl_pid, seq, NULL, NULL, NULL);
194 static int __dump_link_nlmsg(struct nlmsghdr *nlh,
195 libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie)
197 struct nlattr *tb[IFLA_MAX + 1], *attr;
198 struct ifinfomsg *ifi = NLMSG_DATA(nlh);
201 len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*ifi));
202 attr = (struct nlattr *) ((void *) ifi + NLMSG_ALIGN(sizeof(*ifi)));
203 if (libbpf_nla_parse(tb, IFLA_MAX, attr, len, NULL) != 0)
204 return -LIBBPF_ERRNO__NLPARSE;
206 return dump_link_nlmsg(cookie, ifi, tb);
209 static int get_xdp_info(void *cookie, void *msg, struct nlattr **tb)
211 struct nlattr *xdp_tb[IFLA_XDP_MAX + 1];
212 struct xdp_id_md *xdp_id = cookie;
213 struct ifinfomsg *ifinfo = msg;
216 if (xdp_id->ifindex && xdp_id->ifindex != ifinfo->ifi_index)
222 ret = libbpf_nla_parse_nested(xdp_tb, IFLA_XDP_MAX, tb[IFLA_XDP], NULL);
226 if (!xdp_tb[IFLA_XDP_ATTACHED])
229 xdp_id->info.attach_mode = libbpf_nla_getattr_u8(
230 xdp_tb[IFLA_XDP_ATTACHED]);
232 if (xdp_id->info.attach_mode == XDP_ATTACHED_NONE)
235 if (xdp_tb[IFLA_XDP_PROG_ID])
236 xdp_id->info.prog_id = libbpf_nla_getattr_u32(
237 xdp_tb[IFLA_XDP_PROG_ID]);
239 if (xdp_tb[IFLA_XDP_SKB_PROG_ID])
240 xdp_id->info.skb_prog_id = libbpf_nla_getattr_u32(
241 xdp_tb[IFLA_XDP_SKB_PROG_ID]);
243 if (xdp_tb[IFLA_XDP_DRV_PROG_ID])
244 xdp_id->info.drv_prog_id = libbpf_nla_getattr_u32(
245 xdp_tb[IFLA_XDP_DRV_PROG_ID]);
247 if (xdp_tb[IFLA_XDP_HW_PROG_ID])
248 xdp_id->info.hw_prog_id = libbpf_nla_getattr_u32(
249 xdp_tb[IFLA_XDP_HW_PROG_ID]);
254 int bpf_get_link_xdp_info(int ifindex, struct xdp_link_info *info,
255 size_t info_size, __u32 flags)
257 struct xdp_id_md xdp_id = {};
262 if (flags & ~XDP_FLAGS_MASK || !info_size)
265 /* Check whether the single {HW,DRV,SKB} mode is set */
266 flags &= (XDP_FLAGS_SKB_MODE | XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE);
268 if (flags && flags & mask)
271 sock = libbpf_netlink_open(&nl_pid);
275 xdp_id.ifindex = ifindex;
276 xdp_id.flags = flags;
278 ret = libbpf_nl_get_link(sock, nl_pid, get_xdp_info, &xdp_id);
280 size_t sz = min(info_size, sizeof(xdp_id.info));
282 memcpy(info, &xdp_id.info, sz);
283 memset((void *) info + sz, 0, info_size - sz);
290 static __u32 get_xdp_id(struct xdp_link_info *info, __u32 flags)
292 if (info->attach_mode != XDP_ATTACHED_MULTI)
293 return info->prog_id;
294 if (flags & XDP_FLAGS_DRV_MODE)
295 return info->drv_prog_id;
296 if (flags & XDP_FLAGS_HW_MODE)
297 return info->hw_prog_id;
298 if (flags & XDP_FLAGS_SKB_MODE)
299 return info->skb_prog_id;
304 int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags)
306 struct xdp_link_info info;
309 ret = bpf_get_link_xdp_info(ifindex, &info, sizeof(info), flags);
311 *prog_id = get_xdp_id(&info, flags);
316 int libbpf_nl_get_link(int sock, unsigned int nl_pid,
317 libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie)
321 struct ifinfomsg ifm;
323 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
324 .nlh.nlmsg_type = RTM_GETLINK,
325 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
326 .ifm.ifi_family = AF_PACKET,
328 int seq = time(NULL);
330 req.nlh.nlmsg_seq = seq;
331 if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
334 return bpf_netlink_recv(sock, nl_pid, seq, __dump_link_nlmsg,
335 dump_link_nlmsg, cookie);
338 static int __dump_class_nlmsg(struct nlmsghdr *nlh,
339 libbpf_dump_nlmsg_t dump_class_nlmsg,
342 struct nlattr *tb[TCA_MAX + 1], *attr;
343 struct tcmsg *t = NLMSG_DATA(nlh);
346 len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
347 attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
348 if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
349 return -LIBBPF_ERRNO__NLPARSE;
351 return dump_class_nlmsg(cookie, t, tb);
354 int libbpf_nl_get_class(int sock, unsigned int nl_pid, int ifindex,
355 libbpf_dump_nlmsg_t dump_class_nlmsg, void *cookie)
361 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
362 .nlh.nlmsg_type = RTM_GETTCLASS,
363 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
364 .t.tcm_family = AF_UNSPEC,
365 .t.tcm_ifindex = ifindex,
367 int seq = time(NULL);
369 req.nlh.nlmsg_seq = seq;
370 if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
373 return bpf_netlink_recv(sock, nl_pid, seq, __dump_class_nlmsg,
374 dump_class_nlmsg, cookie);
377 static int __dump_qdisc_nlmsg(struct nlmsghdr *nlh,
378 libbpf_dump_nlmsg_t dump_qdisc_nlmsg,
381 struct nlattr *tb[TCA_MAX + 1], *attr;
382 struct tcmsg *t = NLMSG_DATA(nlh);
385 len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
386 attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
387 if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
388 return -LIBBPF_ERRNO__NLPARSE;
390 return dump_qdisc_nlmsg(cookie, t, tb);
393 int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
394 libbpf_dump_nlmsg_t dump_qdisc_nlmsg, void *cookie)
400 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
401 .nlh.nlmsg_type = RTM_GETQDISC,
402 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
403 .t.tcm_family = AF_UNSPEC,
404 .t.tcm_ifindex = ifindex,
406 int seq = time(NULL);
408 req.nlh.nlmsg_seq = seq;
409 if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
412 return bpf_netlink_recv(sock, nl_pid, seq, __dump_qdisc_nlmsg,
413 dump_qdisc_nlmsg, cookie);
416 static int __dump_filter_nlmsg(struct nlmsghdr *nlh,
417 libbpf_dump_nlmsg_t dump_filter_nlmsg,
420 struct nlattr *tb[TCA_MAX + 1], *attr;
421 struct tcmsg *t = NLMSG_DATA(nlh);
424 len = nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*t));
425 attr = (struct nlattr *) ((void *) t + NLMSG_ALIGN(sizeof(*t)));
426 if (libbpf_nla_parse(tb, TCA_MAX, attr, len, NULL) != 0)
427 return -LIBBPF_ERRNO__NLPARSE;
429 return dump_filter_nlmsg(cookie, t, tb);
432 int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
433 libbpf_dump_nlmsg_t dump_filter_nlmsg, void *cookie)
439 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
440 .nlh.nlmsg_type = RTM_GETTFILTER,
441 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
442 .t.tcm_family = AF_UNSPEC,
443 .t.tcm_ifindex = ifindex,
444 .t.tcm_parent = handle,
446 int seq = time(NULL);
448 req.nlh.nlmsg_seq = seq;
449 if (send(sock, &req, req.nlh.nlmsg_len, 0) < 0)
452 return bpf_netlink_recv(sock, nl_pid, seq, __dump_filter_nlmsg,
453 dump_filter_nlmsg, cookie);