#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/fib_rules.h>
+#include <linux/if_addrlabel.h>
+#include <linux/if_bridge.h>
#include "libnetlink.h"
+#define __aligned(x) __attribute__((aligned(x)))
+
#ifndef SOL_NETLINK
#define SOL_NETLINK 270
#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;
+}
+
+static void print_ext_ack_msg(bool is_err, const char *msg)
+{
+ fprintf(stderr, "%s: %s", is_err ? "Error" : "Warning", msg);
+ if (msg[strlen(msg) - 1] != '.')
+ fprintf(stderr, ".");
+ fprintf(stderr, "\n");
+}
+
+/* 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;
+
+ print_ext_ack_msg(is_err, msg);
+ return is_err ? 1 : 0;
+ }
+
+ return 0;
+}
+
+static int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, int error)
+{
+ struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {};
+ unsigned int hlen = sizeof(int);
+ const char *msg = NULL;
+
+ 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 (msg && *msg != '\0') {
+ bool is_err = !!error;
+
+ print_ext_ack_msg(is_err, msg);
+ 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;
+}
+
+static int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, int error)
+{
+ return 0;
+}
+#endif
+
+/* Older kernels may not support strict dump and filtering */
+void rtnl_set_strict_dump(struct rtnl_handle *rth)
+{
+ int one = 1;
+
+ if (setsockopt(rth->fd, SOL_NETLINK, NETLINK_GET_STRICT_CHK,
+ &one, sizeof(one)) < 0)
+ return;
+
+ rth->flags |= RTNL_HANDLE_F_STRICT_CHK;
+}
+
void rtnl_close(struct rtnl_handle *rth)
{
if (rth->fd >= 0) {
{
socklen_t addr_len;
int sndbuf = 32768;
+ int one = 1;
memset(rth, 0, sizeof(*rth));
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;
return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
}
-int rtnl_wilddump_request(struct rtnl_handle *rth, int family, int type)
+int rtnl_addrdump_req(struct rtnl_handle *rth, int family,
+ req_filter_fn_t filter_fn)
{
- return rtnl_wilddump_req_filter(rth, family, type, RTEXT_FILTER_VF);
+ struct {
+ struct nlmsghdr nlh;
+ struct ifaddrmsg ifm;
+ char buf[128];
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
+ .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,
+ };
+
+ if (filter_fn) {
+ int err;
+
+ err = filter_fn(&req.nlh, sizeof(req));
+ if (err)
+ return err;
+ }
+
+ return send(rth->fd, &req, sizeof(req), 0);
}
-int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int family, int type,
- __u32 filt_mask)
+int rtnl_addrlbldump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct ifaddrlblmsg ifal;
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg)),
+ .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,
+ req_filter_fn_t filter_fn)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct rtmsg rtm;
+ char buf[128];
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
+ .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,
+ };
+
+ if (filter_fn) {
+ int err;
+
+ err = filter_fn(&req.nlh, sizeof(req));
+ if (err)
+ return err;
+ }
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+int rtnl_ruledump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct fib_rule_hdr frh;
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
+ .nlh.nlmsg_type = RTM_GETRULE,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .frh.family = family
+ };
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+int rtnl_neighdump_req(struct rtnl_handle *rth, int family,
+ req_filter_fn_t filter_fn)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct ndmsg ndm;
+ char buf[256];
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
+ .nlh.nlmsg_type = RTM_GETNEIGH,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .ndm.ndm_family = family,
+ };
+
+ if (filter_fn) {
+ int err;
+
+ err = filter_fn(&req.nlh, sizeof(req));
+ if (err)
+ return err;
+ }
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+int rtnl_neightbldump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct ndtmsg ndtmsg;
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndtmsg)),
+ .nlh.nlmsg_type = RTM_GETNEIGHTBL,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .ndtmsg.ndtm_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 = NLMSG_LENGTH(sizeof(struct br_port_msg)),
+ .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_netconfdump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct netconfmsg ncm;
+ char buf[0] __aligned(NLMSG_ALIGNTO);
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct netconfmsg))),
+ .nlh.nlmsg_type = RTM_GETNETCONF,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .ncm.ncm_family = family,
+ };
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+int rtnl_nsiddump_req(struct rtnl_handle *rth, int family)
+{
+ struct {
+ struct nlmsghdr nlh;
+ struct rtgenmsg rtm;
+ char buf[0] __aligned(NLMSG_ALIGNTO);
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct rtgenmsg))),
+ .nlh.nlmsg_type = RTM_GETNSID,
+ .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlh.nlmsg_seq = rth->dump = ++rth->seq,
+ .rtm.rtgen_family = family,
+ };
+
+ return send(rth->fd, &req, sizeof(req), 0);
+}
+
+static int __rtnl_linkdump_req(struct rtnl_handle *rth, int family)
{
struct {
struct nlmsghdr nlh;
struct ifinfomsg ifm;
- /* 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_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+ .nlh.nlmsg_type = RTM_GETLINK,
.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,
+int rtnl_linkdump_req(struct rtnl_handle *rth, int family)
+{
+ if (family == AF_UNSPEC)
+ return rtnl_linkdump_req_filter(rth, family, RTEXT_FILTER_VF);
+
+ return __rtnl_linkdump_req(rth, family);
+}
+
+int rtnl_linkdump_req_filter(struct rtnl_handle *rth, int family,
+ __u32 filt_mask)
+{
+ if (family == AF_UNSPEC || family == AF_BRIDGE) {
+ struct {
+ struct nlmsghdr nlh;
+ struct ifinfomsg ifm;
+ /* attribute has to be NLMSG aligned */
+ struct rtattr ext_req __aligned(NLMSG_ALIGNTO);
+ __u32 ext_filter_mask;
+ } req = {
+ .nlh.nlmsg_len = sizeof(req),
+ .nlh.nlmsg_type = RTM_GETLINK,
+ .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);
+ }
+
+ return __rtnl_linkdump_req(rth, family);
+}
+
+int rtnl_linkdump_req_filter_fn(struct rtnl_handle *rth, int family,
req_filter_fn_t filter_fn)
+{
+ if (family == AF_UNSPEC || family == AF_PACKET) {
+ struct {
+ struct nlmsghdr nlh;
+ struct ifinfomsg ifm;
+ char buf[1024];
+ } req = {
+ .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+ .nlh.nlmsg_type = RTM_GETLINK,
+ .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);
+ }
+
+ return __rtnl_linkdump_req(rth, family);
+}
+
+int rtnl_fdb_linkdump_req_filter_fn(struct rtnl_handle *rth,
+ req_filter_fn_t filter_fn)
{
struct {
struct nlmsghdr nlh;
struct ifinfomsg ifm;
- char buf[1024];
+ char buf[128];
} req = {
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
- .nlh.nlmsg_type = type,
+ .nlh.nlmsg_type = RTM_GETNEIGH,
.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
.nlh.nlmsg_seq = rth->dump = ++rth->seq,
- .ifm.ifi_family = family,
+ .ifm.ifi_family = PF_BRIDGE,
};
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);
+ return send(rth->fd, &req, sizeof(req), 0);
}
-int rtnl_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type,
- __u32 filt_mask)
+int rtnl_statsdump_req_filter(struct rtnl_handle *rth, int fam, __u32 filt_mask)
{
struct {
struct nlmsghdr nlh;
memset(&req, 0, sizeof(req));
req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct if_stats_msg));
- req.nlh.nlmsg_type = type;
+ req.nlh.nlmsg_type = RTM_GETSTATS;
req.nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST;
req.nlh.nlmsg_pid = 0;
req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
return sendmsg(rth->fd, &msg, 0);
}
-static int rtnl_dump_done(const struct rtnl_handle *rth,
- struct nlmsghdr *h)
+static int rtnl_dump_done(struct nlmsghdr *h)
{
int len = *(int *)NLMSG_DATA(h);
- if (rth->proto == NETLINK_SOCK_DIAG) {
- if (h->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
- fprintf(stderr, "DONE truncated\n");
- return -1;
- }
+ if (h->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
+ fprintf(stderr, "DONE truncated\n");
+ return -1;
+ }
+ if (len < 0) {
+ /* check for any messages returned from kernel */
+ if (nl_dump_ext_ack_done(h, len))
+ return len;
- if (len < 0) {
- errno = -len;
- if (errno == ENOENT || errno == EOPNOTSUPP)
- return -1;
+ 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;
}
+ return len;
}
+
+ /* check for any messages returned from kernel */
+ nl_dump_ext_ack(h, NULL);
+
return 0;
}
}
}
-int rtnl_dump_filter_l(struct rtnl_handle *rth,
- const struct rtnl_dump_filter_arg *arg)
+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;
+
+ if (len < 32768)
+ len = 32768;
+ 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;
+}
+
+static int rtnl_dump_filter_l(struct rtnl_handle *rth,
+ const struct rtnl_dump_filter_arg *arg)
{
struct sockaddr_nl nladdr;
struct iovec iov;
.msg_iov = &iov,
.msg_iovlen = 1,
};
- char buf[32768];
+ 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);
-
- 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;
- }
+ status = rtnl_recvmsg(rth->fd, &msg, &buf);
+ if (status < 0)
+ return status;
if (rth->dump_fp)
fwrite(buf, 1, NLMSG_ALIGN(status), rth->dump_fp);
dump_intr = 1;
if (h->nlmsg_type == NLMSG_DONE) {
- err = rtnl_dump_done(rth, h);
- if (err < 0)
+ 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) {
rtnl_dump_error(rth, h);
+ free(buf);
return -1;
}
if (!rth->dump_fp) {
- err = a->filter(&nladdr, h, a->arg1);
- if (err < 0)
+ err = a->filter(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)
return rtnl_dump_filter_l(rth, a);
}
-static int __rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
- struct nlmsghdr *answer, size_t maxlen,
- bool show_rtnl_err)
+static void rtnl_talk_error(struct nlmsghdr *h, struct nlmsgerr *err,
+ nl_ext_ack_fn_t errfn)
+{
+ 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)
{
- int status;
- unsigned int seq;
- struct nlmsghdr *h;
struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
- struct iovec iov = {
- .iov_base = n,
- .iov_len = n->nlmsg_len
- };
+ 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[32768] = {};
-
- 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) {
return -1;
}
- 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);
+next:
+ 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",
if (l < 0 || len > status) {
if (msg.msg_flags & MSG_TRUNC) {
fprintf(stderr, "Truncated message\n");
+ free(buf);
return -1;
}
fprintf(stderr,
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));
if (h->nlmsg_type == NLMSG_ERROR) {
struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
+ int error = err->error;
if (l < sizeof(struct nlmsgerr)) {
fprintf(stderr, "ERROR truncated\n");
- } else if (!err->error) {
- if (answer)
- memcpy(answer, h,
- MIN(maxlen, h->nlmsg_len));
- return 0;
+ free(buf);
+ return -1;
}
- if (rtnl->proto != NETLINK_SOCK_DIAG && show_rtnl_err)
- fprintf(stderr,
- "RTNETLINK answers: %s\n",
- strerror(-err->error));
- errno = -err->error;
- return -1;
+ if (!error) {
+ /* check messages from kernel */
+ nl_dump_ext_ack(h, errfn);
+ } else {
+ errno = -error;
+
+ if (rtnl->proto != NETLINK_SOCK_DIAG &&
+ show_rtnl_err)
+ rtnl_talk_error(h, err, errfn);
+ }
+
+ if (answer)
+ *answer = (struct nlmsghdr *)buf;
+ else
+ free(buf);
+
+ if (i < iovlen)
+ goto next;
+ return error ? -i : 0;
}
if (answer) {
- memcpy(answer, h,
- MIN(maxlen, h->nlmsg_len));
+ *answer = (struct nlmsghdr *)buf;
return 0;
}
status -= NLMSG_ALIGN(len);
h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
}
+ free(buf);
if (msg.msg_flags & MSG_TRUNC) {
fprintf(stderr, "Message truncated\n");
}
}
+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, size_t maxlen)
+ struct nlmsghdr **answer)
{
- return __rtnl_talk(rtnl, n, answer, maxlen, true);
+ 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_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
- struct nlmsghdr *answer, size_t maxlen)
+ struct nlmsghdr **answer)
{
- return __rtnl_talk(rtnl, n, answer, maxlen, false);
+ return __rtnl_talk(rtnl, n, answer, false, NULL);
}
int rtnl_listen_all_nsid(struct rtnl_handle *rth)
exit(1);
}
- err = handler(&nladdr, &ctrl, h, jarg);
+ err = handler(&ctrl, h, jarg);
if (err < 0)
return err;
void *jarg)
{
int status;
- struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
char buf[16384];
struct nlmsghdr *h = (struct nlmsghdr *)buf;
return -1;
}
- err = handler(&nladdr, NULL, h, jarg);
+ err = handler(NULL, h, jarg);
if (err < 0)
return err;
}
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;
}
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;
}
return 0;
}
-int parse_rtattr_byindex(struct rtattr *tb[], int max,
- struct rtattr *rta, int len)
-{
- int i = 0;
-
- memset(tb, 0, sizeof(struct rtattr *) * max);
- while (RTA_OK(rta, len)) {
- if (rta->rta_type <= max && i < max)
- tb[i++] = rta;
- rta = RTA_NEXT(rta, len);
- }
- if (len)
- fprintf(stderr, "!!!Deficit %d, rta_len=%d\n",
- len, rta->rta_len);
- return i;
-}
-
struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len)
{
while (RTA_OK(rta, len)) {
projects / mirror_iproute2.git / blobdiff