#include <stdio.h>
#include <stdlib.h>
+#include <stdbool.h>
#include <unistd.h>
-#include <syslog.h>
#include <fcntl.h>
#include <net/if_arp.h>
#include <sys/socket.h>
#include <errno.h>
#include <time.h>
#include <sys/uio.h>
+#include <linux/if_addrlabel.h>
+#include <linux/if_bridge.h>
#include "libnetlink.h"
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
+#ifndef MIN
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
int rcvbuf = 1024 * 1024;
+#ifdef HAVE_LIBMNL
+#include <libmnl/libmnl.h>
+
+static const enum mnl_attr_data_type extack_policy[NLMSGERR_ATTR_MAX + 1] = {
+ [NLMSGERR_ATTR_MSG] = MNL_TYPE_NUL_STRING,
+ [NLMSGERR_ATTR_OFFS] = MNL_TYPE_U32,
+};
+
+static int err_attr_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = data;
+ uint16_t type;
+
+ if (mnl_attr_type_valid(attr, NLMSGERR_ATTR_MAX) < 0) {
+ fprintf(stderr, "Invalid extack attribute\n");
+ return MNL_CB_ERROR;
+ }
+
+ type = mnl_attr_get_type(attr);
+ if (mnl_attr_validate(attr, extack_policy[type]) < 0) {
+ fprintf(stderr, "extack attribute %d failed validation\n",
+ type);
+ return MNL_CB_ERROR;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+/* dump netlink extended ack error message */
+int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
+{
+ struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {};
+ const struct nlmsgerr *err = mnl_nlmsg_get_payload(nlh);
+ const struct nlmsghdr *err_nlh = NULL;
+ unsigned int hlen = sizeof(*err);
+ const char *msg = NULL;
+ uint32_t off = 0;
+
+ /* no TLVs, nothing to do here */
+ if (!(nlh->nlmsg_flags & NLM_F_ACK_TLVS))
+ return 0;
+
+ /* if NLM_F_CAPPED is set then the inner err msg was capped */
+ if (!(nlh->nlmsg_flags & NLM_F_CAPPED))
+ hlen += mnl_nlmsg_get_payload_len(&err->msg);
+
+ if (mnl_attr_parse(nlh, hlen, err_attr_cb, tb) != MNL_CB_OK)
+ return 0;
+
+ if (tb[NLMSGERR_ATTR_MSG])
+ msg = mnl_attr_get_str(tb[NLMSGERR_ATTR_MSG]);
+
+ if (tb[NLMSGERR_ATTR_OFFS]) {
+ off = mnl_attr_get_u32(tb[NLMSGERR_ATTR_OFFS]);
+
+ if (off > nlh->nlmsg_len) {
+ fprintf(stderr,
+ "Invalid offset for NLMSGERR_ATTR_OFFS\n");
+ off = 0;
+ } else if (!(nlh->nlmsg_flags & NLM_F_CAPPED))
+ err_nlh = &err->msg;
+ }
+
+ if (errfn)
+ return errfn(msg, off, err_nlh);
+
+ if (msg && *msg != '\0') {
+ bool is_err = !!err->error;
+
+ fprintf(stderr, "%s: %s",
+ is_err ? "Error" : "Warning", msg);
+ if (msg[strlen(msg) - 1] != '.')
+ fprintf(stderr, ".");
+ fprintf(stderr, "\n");
+
+ return is_err ? 1 : 0;
+ }
+
+ return 0;
+}
+#else
+#warning "libmnl required for error support"
+
+/* No extended error ack without libmnl */
+int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
+{
+ return 0;
+}
+#endif
+
void rtnl_close(struct rtnl_handle *rth)
{
if (rth->fd >= 0) {
}
}
-int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
+int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions,
int protocol)
{
socklen_t addr_len;
int sndbuf = 32768;
+ int one = 1;
memset(rth, 0, sizeof(*rth));
return -1;
}
- if (setsockopt(rth->fd,SOL_SOCKET,SO_SNDBUF,&sndbuf,sizeof(sndbuf)) < 0) {
+ if (setsockopt(rth->fd, SOL_SOCKET, SO_SNDBUF,
+ &sndbuf, sizeof(sndbuf)) < 0) {
perror("SO_SNDBUF");
return -1;
}
- if (setsockopt(rth->fd,SOL_SOCKET,SO_RCVBUF,&rcvbuf,sizeof(rcvbuf)) < 0) {
+ if (setsockopt(rth->fd, SOL_SOCKET, SO_RCVBUF,
+ &rcvbuf, sizeof(rcvbuf)) < 0) {
perror("SO_RCVBUF");
return -1;
}
+ /* Older kernels may no support extended ACK reporting */
+ setsockopt(rth->fd, SOL_NETLINK, NETLINK_EXT_ACK,
+ &one, sizeof(one));
+
memset(&rth->local, 0, sizeof(rth->local));
rth->local.nl_family = AF_NETLINK;
rth->local.nl_groups = subscriptions;
- if (bind(rth->fd, (struct sockaddr*)&rth->local, sizeof(rth->local)) < 0) {
+ if (bind(rth->fd, (struct sockaddr *)&rth->local,
+ sizeof(rth->local)) < 0) {
perror("Cannot bind netlink socket");
return -1;
}
addr_len = sizeof(rth->local);
- if (getsockname(rth->fd, (struct sockaddr*)&rth->local, &addr_len) < 0) {
+ if (getsockname(rth->fd, (struct sockaddr *)&rth->local,
+ &addr_len) < 0) {
perror("Cannot getsockname");
return -1;
}
return -1;
}
if (rth->local.nl_family != AF_NETLINK) {
- fprintf(stderr, "Wrong address family %d\n", rth->local.nl_family);
+ fprintf(stderr, "Wrong address family %d\n",
+ rth->local.nl_family);
return -1;
}
rth->seq = time(NULL);
return 0;
}
-int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
+int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
{
return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
}
+int rtnl_addrdump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct ifaddrmsg ifm;
+ } req = {
+ .nlh.nlmsg_len = sizeof(req),
+ .nlh.nlmsg_type = RTM_GETADDR,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .ifm.ifa_family = family,
+ };
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+int rtnl_addrlbldump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct ifaddrlblmsg ifal;
+ } req = {
+ .nlh.nlmsg_len = sizeof(req),
+ .nlh.nlmsg_type = RTM_GETADDRLABEL,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .ifal.ifal_family = family,
+ };
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+int rtnl_routedump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct rtmsg rtm;
+ } req = {
+ .nlh.nlmsg_len = sizeof(req),
+ .nlh.nlmsg_type = RTM_GETROUTE,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .rtm.rtm_family = family,
+ };
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+int rtnl_mdbdump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct br_port_msg bpm;
+ } req = {
+ .nlh.nlmsg_len = sizeof(req),
+ .nlh.nlmsg_type = RTM_GETMDB,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .bpm.family = family,
+ };
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
{
return rtnl_wilddump_req_filter(rth, family, type, RTEXT_FILTER_VF);
/* attribute has to be NLMSG aligned */
struct rtattr ext_req __attribute__ ((aligned(NLMSG_ALIGNTO)));
__u32 ext_filter_mask;
+ } req = {
+ .nlh.nlmsg_len = sizeof(req),
+ .nlh.nlmsg_type = type,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .ifm.ifi_family = family,
+ .ext_req.rta_type = IFLA_EXT_MASK,
+ .ext_req.rta_len = RTA_LENGTH(sizeof(__u32)),
+ .ext_filter_mask = filt_mask,
+ };
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+int rtnl_wilddump_req_filter_fn(struct rtnl_handle *rth, int family, int type,
+ req_filter_fn_t filter_fn)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct ifinfomsg ifm;
+ char buf[1024];
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+ .nlh.nlmsg_type = type,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .ifm.ifi_family = family,
+ };
+ int err;
+
+ if (!filter_fn)
+ return -EINVAL;
+
+ err = filter_fn(&req.nlh, sizeof(req));
+ if (err)
+ return err;
+
+ return send(rth->fd, &req, req.nlh.nlmsg_len, 0);
+}
+
+int rtnl_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type,
+ __u32 filt_mask)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct if_stats_msg ifsm;
} req;
memset(&req, 0, sizeof(req));
- req.nlh.nlmsg_len = sizeof(req);
+ req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct if_stats_msg));
req.nlh.nlmsg_type = type;
req.nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST;
req.nlh.nlmsg_pid = 0;
req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
- req.ifm.ifi_family = family;
-
- req.ext_req.rta_type = IFLA_EXT_MASK;
- req.ext_req.rta_len = RTA_LENGTH(sizeof(__u32));
- req.ext_filter_mask = filt_mask;
+ req.ifsm.family = fam;
+ req.ifsm.filter_mask = filt_mask;
- return send(rth->fd, (void*)&req, sizeof(req), 0);
+ return send(rth->fd, &req, sizeof(req), 0);
}
int rtnl_send(struct rtnl_handle *rth, const void *buf, int len)
for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status);
h = NLMSG_NEXT(h, status)) {
if (h->nlmsg_type == NLMSG_ERROR) {
- struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
+
if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
fprintf(stderr, "ERROR truncated\n");
- else
+ else
errno = -err->error;
return -1;
}
int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
{
- struct nlmsghdr nlh;
+ struct nlmsghdr nlh = {
+ .nlmsg_len = NLMSG_LENGTH(len),
+ .nlmsg_type = type,
+ .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlmsg_seq = rth->dump = ++rth->seq,
+ };
struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
struct iovec iov[2] = {
{ .iov_base = &nlh, .iov_len = sizeof(nlh) },
};
struct msghdr msg = {
.msg_name = &nladdr,
- .msg_namelen = sizeof(nladdr),
+ .msg_namelen = sizeof(nladdr),
.msg_iov = iov,
.msg_iovlen = 2,
};
- nlh.nlmsg_len = NLMSG_LENGTH(len);
- nlh.nlmsg_type = type;
- nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST;
- nlh.nlmsg_pid = 0;
- nlh.nlmsg_seq = rth->dump = ++rth->seq;
+ return sendmsg(rth->fd, &msg, 0);
+}
+
+int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
+{
+ struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
+ struct iovec iov = {
+ .iov_base = n,
+ .iov_len = n->nlmsg_len
+ };
+ struct msghdr msg = {
+ .msg_name = &nladdr,
+ .msg_namelen = sizeof(nladdr),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ };
+
+ n->nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST;
+ n->nlmsg_pid = 0;
+ n->nlmsg_seq = rth->dump = ++rth->seq;
return sendmsg(rth->fd, &msg, 0);
}
+static int rtnl_dump_done(struct nlmsghdr *h)
+{
+ int len = *(int *)NLMSG_DATA(h);
+
+ if (h->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
+ fprintf(stderr, "DONE truncated\n");
+ return -1;
+ }
+
+ if (len < 0) {
+ errno = -len;
+ switch (errno) {
+ case ENOENT:
+ case EOPNOTSUPP:
+ return -1;
+ case EMSGSIZE:
+ fprintf(stderr,
+ "Error: Buffer too small for object.\n");
+ break;
+ default:
+ perror("RTNETLINK answers");
+ }
+ return len;
+ }
+
+ /* check for any messages returned from kernel */
+ nl_dump_ext_ack(h, NULL);
+
+ return 0;
+}
+
+static void rtnl_dump_error(const struct rtnl_handle *rth,
+ struct nlmsghdr *h)
+{
+
+ if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
+ fprintf(stderr, "ERROR truncated\n");
+ } else {
+ const struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
+
+ errno = -err->error;
+ if (rth->proto == NETLINK_SOCK_DIAG &&
+ (errno == ENOENT ||
+ errno == EOPNOTSUPP))
+ return;
+
+ if (!(rth->flags & RTNL_HANDLE_F_SUPPRESS_NLERR))
+ perror("RTNETLINK answers");
+ }
+}
+
+static int __rtnl_recvmsg(int fd, struct msghdr *msg, int flags)
+{
+ int len;
+
+ do {
+ len = recvmsg(fd, msg, flags);
+ } while (len < 0 && (errno == EINTR || errno == EAGAIN));
+
+ if (len < 0) {
+ fprintf(stderr, "netlink receive error %s (%d)\n",
+ strerror(errno), errno);
+ return -errno;
+ }
+
+ if (len == 0) {
+ fprintf(stderr, "EOF on netlink\n");
+ return -ENODATA;
+ }
+
+ return len;
+}
+
+static int rtnl_recvmsg(int fd, struct msghdr *msg, char **answer)
+{
+ struct iovec *iov = msg->msg_iov;
+ char *buf;
+ int len;
+
+ iov->iov_base = NULL;
+ iov->iov_len = 0;
+
+ len = __rtnl_recvmsg(fd, msg, MSG_PEEK | MSG_TRUNC);
+ if (len < 0)
+ return len;
+
+ buf = malloc(len);
+ if (!buf) {
+ fprintf(stderr, "malloc error: not enough buffer\n");
+ return -ENOMEM;
+ }
+
+ iov->iov_base = buf;
+ iov->iov_len = len;
+
+ len = __rtnl_recvmsg(fd, msg, 0);
+ if (len < 0) {
+ free(buf);
+ return len;
+ }
+
+ if (answer)
+ *answer = buf;
+ else
+ free(buf);
+
+ return len;
+}
+
int rtnl_dump_filter_l(struct rtnl_handle *rth,
const struct rtnl_dump_filter_arg *arg)
{
.msg_iov = &iov,
.msg_iovlen = 1,
};
- char buf[16384];
+ char *buf;
int dump_intr = 0;
- iov.iov_base = buf;
while (1) {
int status;
const struct rtnl_dump_filter_arg *a;
int found_done = 0;
int msglen = 0;
- iov.iov_len = sizeof(buf);
- status = recvmsg(rth->fd, &msg, 0);
+ status = rtnl_recvmsg(rth->fd, &msg, &buf);
+ if (status < 0)
+ return status;
- if (status < 0) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- fprintf(stderr, "netlink receive error %s (%d)\n",
- strerror(errno), errno);
- return -1;
- }
-
- if (status == 0) {
- fprintf(stderr, "EOF on netlink\n");
- return -1;
- }
+ if (rth->dump_fp)
+ fwrite(buf, 1, NLMSG_ALIGN(status), rth->dump_fp);
for (a = arg; a->filter; a++) {
- struct nlmsghdr *h = (struct nlmsghdr*)buf;
+ struct nlmsghdr *h = (struct nlmsghdr *)buf;
+
msglen = status;
while (NLMSG_OK(h, msglen)) {
- int err;
+ int err = 0;
+
+ h->nlmsg_flags &= ~a->nc_flags;
if (nladdr.nl_pid != 0 ||
h->nlmsg_pid != rth->local.nl_pid ||
dump_intr = 1;
if (h->nlmsg_type == NLMSG_DONE) {
+ err = rtnl_dump_done(h);
+ if (err < 0) {
+ free(buf);
+ return -1;
+ }
+
found_done = 1;
break; /* process next filter */
}
+
if (h->nlmsg_type == NLMSG_ERROR) {
- struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
- if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
- fprintf(stderr,
- "ERROR truncated\n");
- } else {
- errno = -err->error;
- if (rth->proto == NETLINK_SOCK_DIAG &&
- errno == ENOENT)
- return -1;
-
- perror("RTNETLINK answers");
- }
+ rtnl_dump_error(rth, h);
+ free(buf);
return -1;
}
- err = a->filter(&nladdr, h, a->arg1);
- if (err < 0)
- return err;
+
+ if (!rth->dump_fp) {
+ err = a->filter(&nladdr, h, a->arg1);
+ if (err < 0) {
+ free(buf);
+ return err;
+ }
+ }
skip_it:
h = NLMSG_NEXT(h, msglen);
}
}
+ free(buf);
if (found_done) {
if (dump_intr)
}
}
-int rtnl_dump_filter(struct rtnl_handle *rth,
+int rtnl_dump_filter_nc(struct rtnl_handle *rth,
rtnl_filter_t filter,
- void *arg1)
+ void *arg1, __u16 nc_flags)
{
const struct rtnl_dump_filter_arg a[2] = {
- { .filter = filter, .arg1 = arg1, },
- { .filter = NULL, .arg1 = NULL, },
+ { .filter = filter, .arg1 = arg1, .nc_flags = nc_flags, },
+ { .filter = NULL, .arg1 = NULL, .nc_flags = 0, },
};
return rtnl_dump_filter_l(rth, a);
}
-int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
- unsigned groups, struct nlmsghdr *answer)
+static void rtnl_talk_error(struct nlmsghdr *h, struct nlmsgerr *err,
+ nl_ext_ack_fn_t errfn)
{
- int status;
- unsigned seq;
- struct nlmsghdr *h;
- struct sockaddr_nl nladdr;
- struct iovec iov = {
- .iov_base = (void*) n,
- .iov_len = n->nlmsg_len
- };
+ if (nl_dump_ext_ack(h, errfn))
+ return;
+
+ fprintf(stderr, "RTNETLINK answers: %s\n",
+ strerror(-err->error));
+}
+
+
+static int __rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iov,
+ size_t iovlen, struct nlmsghdr **answer,
+ bool show_rtnl_err, nl_ext_ack_fn_t errfn)
+{
+ struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
+ struct iovec riov;
struct msghdr msg = {
.msg_name = &nladdr,
.msg_namelen = sizeof(nladdr),
- .msg_iov = &iov,
- .msg_iovlen = 1,
+ .msg_iov = iov,
+ .msg_iovlen = iovlen,
};
- char buf[16384];
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
- nladdr.nl_pid = peer;
- nladdr.nl_groups = groups;
-
- n->nlmsg_seq = seq = ++rtnl->seq;
-
- if (answer == NULL)
- n->nlmsg_flags |= NLM_F_ACK;
+ unsigned int seq = 0;
+ struct nlmsghdr *h;
+ int i, status;
+ char *buf;
+
+ for (i = 0; i < iovlen; i++) {
+ h = iov[i].iov_base;
+ h->nlmsg_seq = seq = ++rtnl->seq;
+ if (answer == NULL)
+ h->nlmsg_flags |= NLM_F_ACK;
+ }
status = sendmsg(rtnl->fd, &msg, 0);
-
if (status < 0) {
perror("Cannot talk to rtnetlink");
return -1;
}
- memset(buf,0,sizeof(buf));
-
- iov.iov_base = buf;
-
+ /* change msg to use the response iov */
+ msg.msg_iov = &riov;
+ msg.msg_iovlen = 1;
+ i = 0;
while (1) {
- iov.iov_len = sizeof(buf);
- status = recvmsg(rtnl->fd, &msg, 0);
+ status = rtnl_recvmsg(rtnl->fd, &msg, &buf);
+ ++i;
+
+ if (status < 0)
+ return status;
- if (status < 0) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- fprintf(stderr, "netlink receive error %s (%d)\n",
- strerror(errno), errno);
- return -1;
- }
- if (status == 0) {
- fprintf(stderr, "EOF on netlink\n");
- return -1;
- }
if (msg.msg_namelen != sizeof(nladdr)) {
- fprintf(stderr, "sender address length == %d\n", msg.msg_namelen);
+ fprintf(stderr,
+ "sender address length == %d\n",
+ msg.msg_namelen);
exit(1);
}
- for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) {
+ for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) {
int len = h->nlmsg_len;
int l = len - sizeof(*h);
- if (l < 0 || len>status) {
+ if (l < 0 || len > status) {
if (msg.msg_flags & MSG_TRUNC) {
fprintf(stderr, "Truncated message\n");
+ free(buf);
return -1;
}
- fprintf(stderr, "!!!malformed message: len=%d\n", len);
+ fprintf(stderr,
+ "!!!malformed message: len=%d\n",
+ len);
exit(1);
}
- if (nladdr.nl_pid != peer ||
+ if (nladdr.nl_pid != 0 ||
h->nlmsg_pid != rtnl->local.nl_pid ||
- h->nlmsg_seq != seq) {
+ h->nlmsg_seq > seq || h->nlmsg_seq < seq - iovlen) {
/* Don't forget to skip that message. */
status -= NLMSG_ALIGN(len);
- h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
+ h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
continue;
}
if (h->nlmsg_type == NLMSG_ERROR) {
- struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
+
if (l < sizeof(struct nlmsgerr)) {
fprintf(stderr, "ERROR truncated\n");
- } else {
- if (!err->error) {
- if (answer)
- memcpy(answer, h, h->nlmsg_len);
- return 0;
- }
+ free(buf);
+ return -1;
+ }
- fprintf(stderr, "RTNETLINK answers: %s\n", strerror(-err->error));
+ if (!err->error)
+ /* check messages from kernel */
+ nl_dump_ext_ack(h, errfn);
+ else {
errno = -err->error;
+
+ if (rtnl->proto != NETLINK_SOCK_DIAG &&
+ show_rtnl_err)
+ rtnl_talk_error(h, err, errfn);
}
- return -1;
+
+ if (answer)
+ *answer = (struct nlmsghdr *)buf;
+ else
+ free(buf);
+
+ return err->error ? -i : 0;
}
+
if (answer) {
- memcpy(answer, h, h->nlmsg_len);
+ *answer = (struct nlmsghdr *)buf;
return 0;
}
fprintf(stderr, "Unexpected reply!!!\n");
status -= NLMSG_ALIGN(len);
- h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
+ h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
}
+ free(buf);
+
if (msg.msg_flags & MSG_TRUNC) {
fprintf(stderr, "Message truncated\n");
continue;
}
+
if (status) {
fprintf(stderr, "!!!Remnant of size %d\n", status);
exit(1);
}
}
+static int __rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
+ struct nlmsghdr **answer,
+ bool show_rtnl_err, nl_ext_ack_fn_t errfn)
+{
+ struct iovec iov = {
+ .iov_base = n,
+ .iov_len = n->nlmsg_len
+ };
+
+ return __rtnl_talk_iov(rtnl, &iov, 1, answer, show_rtnl_err, errfn);
+}
+
+int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
+ struct nlmsghdr **answer)
+{
+ return __rtnl_talk(rtnl, n, answer, true, NULL);
+}
+
+int rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iovec, size_t iovlen,
+ struct nlmsghdr **answer)
+{
+ return __rtnl_talk_iov(rtnl, iovec, iovlen, answer, true, NULL);
+}
+
+int rtnl_talk_extack(struct rtnl_handle *rtnl, struct nlmsghdr *n,
+ struct nlmsghdr **answer,
+ nl_ext_ack_fn_t errfn)
+{
+ return __rtnl_talk(rtnl, n, answer, true, errfn);
+}
+
+int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
+ struct nlmsghdr **answer)
+{
+ return __rtnl_talk(rtnl, n, answer, false, NULL);
+}
+
+int rtnl_listen_all_nsid(struct rtnl_handle *rth)
+{
+ unsigned int on = 1;
+
+ if (setsockopt(rth->fd, SOL_NETLINK, NETLINK_LISTEN_ALL_NSID, &on,
+ sizeof(on)) < 0) {
+ perror("NETLINK_LISTEN_ALL_NSID");
+ return -1;
+ }
+ rth->flags |= RTNL_HANDLE_F_LISTEN_ALL_NSID;
+ return 0;
+}
+
int rtnl_listen(struct rtnl_handle *rtnl,
- rtnl_filter_t handler,
+ rtnl_listen_filter_t handler,
void *jarg)
{
int status;
struct nlmsghdr *h;
- struct sockaddr_nl nladdr;
+ struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
struct iovec iov;
struct msghdr msg = {
.msg_name = &nladdr,
.msg_iovlen = 1,
};
char buf[16384];
+ char cmsgbuf[BUFSIZ];
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
- nladdr.nl_pid = 0;
- nladdr.nl_groups = 0;
+ if (rtnl->flags & RTNL_HANDLE_F_LISTEN_ALL_NSID) {
+ msg.msg_control = &cmsgbuf;
+ msg.msg_controllen = sizeof(cmsgbuf);
+ }
iov.iov_base = buf;
while (1) {
+ struct rtnl_ctrl_data ctrl;
+ struct cmsghdr *cmsg;
+
iov.iov_len = sizeof(buf);
status = recvmsg(rtnl->fd, &msg, 0);
return -1;
}
if (msg.msg_namelen != sizeof(nladdr)) {
- fprintf(stderr, "Sender address length == %d\n", msg.msg_namelen);
+ fprintf(stderr,
+ "Sender address length == %d\n",
+ msg.msg_namelen);
exit(1);
}
- for (h = (struct nlmsghdr*)buf; status >= sizeof(*h); ) {
+
+ if (rtnl->flags & RTNL_HANDLE_F_LISTEN_ALL_NSID) {
+ memset(&ctrl, 0, sizeof(ctrl));
+ ctrl.nsid = -1;
+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg;
+ cmsg = CMSG_NXTHDR(&msg, cmsg))
+ if (cmsg->cmsg_level == SOL_NETLINK &&
+ cmsg->cmsg_type == NETLINK_LISTEN_ALL_NSID &&
+ cmsg->cmsg_len == CMSG_LEN(sizeof(int))) {
+ int *data = (int *)CMSG_DATA(cmsg);
+
+ ctrl.nsid = *data;
+ }
+ }
+
+ for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) {
int err;
int len = h->nlmsg_len;
int l = len - sizeof(*h);
- if (l<0 || len>status) {
+ if (l < 0 || len > status) {
if (msg.msg_flags & MSG_TRUNC) {
fprintf(stderr, "Truncated message\n");
return -1;
}
- fprintf(stderr, "!!!malformed message: len=%d\n", len);
+ fprintf(stderr,
+ "!!!malformed message: len=%d\n",
+ len);
exit(1);
}
- err = handler(&nladdr, h, jarg);
+ err = handler(&nladdr, &ctrl, h, jarg);
if (err < 0)
return err;
status -= NLMSG_ALIGN(len);
- h = (struct nlmsghdr*)((char*)h + NLMSG_ALIGN(len));
+ h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
}
if (msg.msg_flags & MSG_TRUNC) {
fprintf(stderr, "Message truncated\n");
}
}
-int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler,
+int rtnl_from_file(FILE *rtnl, rtnl_listen_filter_t handler,
void *jarg)
{
int status;
- struct sockaddr_nl nladdr;
- char buf[16384];
- struct nlmsghdr *h = (void*)buf;
-
- memset(&nladdr, 0, sizeof(nladdr));
- nladdr.nl_family = AF_NETLINK;
- nladdr.nl_pid = 0;
- nladdr.nl_groups = 0;
+ struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
+ char buf[16384];
+ struct nlmsghdr *h = (struct nlmsghdr *)buf;
while (1) {
int err, len;
len = h->nlmsg_len;
l = len - sizeof(*h);
- if (l<0 || len>sizeof(buf)) {
+ if (l < 0 || len > sizeof(buf)) {
fprintf(stderr, "!!!malformed message: len=%d @%lu\n",
len, ftell(rtnl));
return -1;
return -1;
}
- err = handler(&nladdr, h, jarg);
+ err = handler(&nladdr, NULL, h, jarg);
if (err < 0)
return err;
}
struct rtattr *rta;
if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
- fprintf(stderr, "addattr_l ERROR: message exceeded bound of %d\n",maxlen);
+ fprintf(stderr,
+ "addattr_l ERROR: message exceeded bound of %d\n",
+ maxlen);
return -1;
}
rta = NLMSG_TAIL(n);
rta->rta_type = type;
rta->rta_len = len;
- memcpy(RTA_DATA(rta), data, alen);
+ if (alen)
+ memcpy(RTA_DATA(rta), data, alen);
n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
return 0;
}
int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len)
{
if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) {
- fprintf(stderr, "addraw_l ERROR: message exceeded bound of %d\n",maxlen);
+ fprintf(stderr,
+ "addraw_l ERROR: message exceeded bound of %d\n",
+ maxlen);
return -1;
}
struct rtattr *subrta;
if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
- fprintf(stderr,"rta_addattr32: Error! max allowed bound %d exceeded\n",maxlen);
+ fprintf(stderr,
+ "rta_addattr32: Error! max allowed bound %d exceeded\n",
+ maxlen);
return -1;
}
- subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
+ subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len));
subrta->rta_type = type;
subrta->rta_len = len;
memcpy(RTA_DATA(subrta), &data, 4);
int len = RTA_LENGTH(alen);
if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) {
- fprintf(stderr,"rta_addattr_l: Error! max allowed bound %d exceeded\n",maxlen);
+ fprintf(stderr,
+ "rta_addattr_l: Error! max allowed bound %d exceeded\n",
+ maxlen);
return -1;
}
- subrta = (struct rtattr*)(((char*)rta) + RTA_ALIGN(rta->rta_len));
+ subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len));
subrta->rta_type = type;
subrta->rta_len = len;
- memcpy(RTA_DATA(subrta), data, alen);
+ if (alen)
+ memcpy(RTA_DATA(subrta), data, alen);
rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len);
return 0;
}
+int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data)
+{
+ return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u8));
+}
+
+int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data)
+{
+ return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u16));
+}
+
+int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data)
+{
+ return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u64));
+}
+
+struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type)
+{
+ struct rtattr *nest = RTA_TAIL(rta);
+
+ rta_addattr_l(rta, maxlen, type, NULL, 0);
+
+ return nest;
+}
+
+int rta_nest_end(struct rtattr *rta, struct rtattr *nest)
+{
+ nest->rta_len = (void *)RTA_TAIL(rta) - (void *)nest;
+
+ return rta->rta_len;
+}
+
int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
{
return parse_rtattr_flags(tb, max, rta, len, 0);
type = rta->rta_type & ~flags;
if ((type <= max) && (!tb[type]))
tb[type] = rta;
- rta = RTA_NEXT(rta,len);
+ rta = RTA_NEXT(rta, len);
}
if (len)
- fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
+ fprintf(stderr, "!!!Deficit %d, rta_len=%d\n",
+ len, rta->rta_len);
return 0;
}
-int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len)
+int parse_rtattr_byindex(struct rtattr *tb[], int max,
+ struct rtattr *rta, int len)
{
int i = 0;
while (RTA_OK(rta, len)) {
if (rta->rta_type <= max && i < max)
tb[i++] = rta;
- rta = RTA_NEXT(rta,len);
+ rta = RTA_NEXT(rta, len);
}
if (len)
- fprintf(stderr, "!!!Deficit %d, rta_len=%d\n", len, rta->rta_len);
+ fprintf(stderr, "!!!Deficit %d, rta_len=%d\n",
+ len, rta->rta_len);
return i;
}
-int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta,
- int len)
+struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len)
+{
+ while (RTA_OK(rta, len)) {
+ if (rta->rta_type == type)
+ return rta;
+ rta = RTA_NEXT(rta, len);
+ }
+
+ if (len)
+ fprintf(stderr, "!!!Deficit %d, rta_len=%d\n",
+ len, rta->rta_len);
+ return NULL;
+}
+
+int __parse_rtattr_nested_compat(struct rtattr *tb[], int max,
+ struct rtattr *rta,
+ int len)
{
if (RTA_PAYLOAD(rta) < len)
return -1;
projects / mirror_iproute2.git / blobdiff