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ip neigh: Add support for filtering dumps by master device

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Add support for filtering neighbor dumps by master device. Kernel side
support provided by commit 21fdd092acc7. Since the feature is not
available in older kernels the user is given a warning message if the
kernel does not support the request.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
This commit is contained in:
David Ahern 2015-10-02 09:42:27 -07:00 committed by Stephen Hemminger
parent 23e905096c
commit 0d238ca2b8
3 changed files with 54 additions and 4 deletions
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2
include/libnetlink.h
View File

@ -42,6 +42,8 @@ int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
int len)
__attribute__((warn_unused_result));
int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
__attribute__((warn_unused_result));
struct rtnl_ctrl_data {
int nsid;

35
ip/ipneigh.c
View File

@ -39,6 +39,7 @@ static struct
char *flushb;
int flushp;
int flushe;
int master;
} filter;
static void usage(void) __attribute__((noreturn));
@ -193,6 +194,7 @@ int print_neigh(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
int len = n->nlmsg_len;
struct rtattr * tb[NDA_MAX+1];
char abuf[256];
static int logit = 1;
if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH &&
n->nlmsg_type != RTM_GETNEIGH) {
@ -220,6 +222,14 @@ int print_neigh(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
(r->ndm_family != AF_DECnet))
return 0;
if (filter.master && !(n->nlmsg_flags & NLM_F_DUMP_FILTERED)) {
if (logit) {
logit = 0;
fprintf(fp,
"\nWARNING: Kernel does not support filtering by master device\n\n");
}
}
parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
if (tb[NDA_DST]) {
@ -327,9 +337,18 @@ void ipneigh_reset_filter(int ifindex)
static int do_show_or_flush(int argc, char **argv, int flush)
{
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
char *filter_dev = NULL;
int state_given = 0;
struct ndmsg ndm = { 0 };
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = RTM_GETNEIGH;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
ipneigh_reset_filter(0);
@ -351,6 +370,14 @@ static int do_show_or_flush(int argc, char **argv, int flush)
if (filter_dev)
duparg("dev", *argv);
filter_dev = *argv;
} else if (strcmp(*argv, "master") == 0) {
int ifindex;
NEXT_ARG();
ifindex = ll_name_to_index(*argv);
if (!ifindex)
invarg("Device does not exist\n", *argv);
addattr32(&req.n, sizeof(req), NDA_MASTER, ifindex);
filter.master = ifindex;
} else if (strcmp(*argv, "unused") == 0) {
filter.unused_only = 1;
} else if (strcmp(*argv, "nud") == 0) {
@ -371,7 +398,7 @@ static int do_show_or_flush(int argc, char **argv, int flush)
state = 0x100;
filter.state |= state;
} else if (strcmp(*argv, "proxy") == 0)
ndm.ndm_flags = NTF_PROXY;
req.ndm.ndm_flags = NTF_PROXY;
else {
if (strcmp(*argv, "to") == 0) {
NEXT_ARG();
@ -436,9 +463,9 @@ static int do_show_or_flush(int argc, char **argv, int flush)
return 1;
}
ndm.ndm_family = filter.family;
req.ndm.ndm_family = filter.family;
if (rtnl_dump_request(&rth, RTM_GETNEIGH, &ndm, sizeof(struct ndmsg)) < 0) {
if (rtnl_dump_request_n(&rth, &req.n) < 0) {
perror("Cannot send dump request");
exit(1);
}

21
lib/libnetlink.c
View File

@ -191,6 +191,27 @@ int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
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 = (void*) 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);
}
int rtnl_dump_filter_l(struct rtnl_handle *rth,
const struct rtnl_dump_filter_arg *arg)
{