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Date: Mon, 07 Oct 2019 16:32:41 +0200
From: Petr Oros <poros@...hat.com>
To: Nicolas Dichtel <nicolas.dichtel@...nd.com>,
stephen@...workplumber.org
Cc: netdev@...r.kernel.org, dsahern@...il.com
Subject: Re: [PATCH iproute2] ipnetns: enable to dump nsid conversion table
Nicolas Dichtel píše v Po 07. 10. 2019 v 15:44 +0200:
> This patch enables to dump/get nsid from a netns into another netns.
>
> Example:
> $ ./test.sh
> + ip netns add foo
> + ip netns add bar
> + touch /var/run/netns/init_net
> + mount --bind /proc/1/ns/net /var/run/netns/init_net
> + ip netns set init_net 11
> + ip netns set foo 12
> + ip netns set bar 13
> + ip netns
> init_net (id: 11)
> bar (id: 13)
> foo (id: 12)
> + ip -n foo netns set init_net 21
> + ip -n foo netns set foo 22
> + ip -n foo netns set bar 23
> + ip -n foo netns
> init_net (id: 21)
> bar (id: 23)
> foo (id: 22)
> + ip -n bar netns set init_net 31
> + ip -n bar netns set foo 32
> + ip -n bar netns set bar 33
> + ip -n bar netns
> init_net (id: 31)
> bar (id: 33)
> foo (id: 32)
> + ip netns list-id target-nsid 12
> nsid 21 current-nsid 11 (iproute2 netns name: init_net)
> nsid 22 current-nsid 12 (iproute2 netns name: foo)
> nsid 23 current-nsid 13 (iproute2 netns name: bar)
> + ip -n foo netns list-id target-nsid 21
> nsid 11 current-nsid 21 (iproute2 netns name: init_net)
> nsid 12 current-nsid 22 (iproute2 netns name: foo)
> nsid 13 current-nsid 23 (iproute2 netns name: bar)
> + ip -n bar netns list-id target-nsid 33 nsid 32
> nsid 32 current-nsid 32 (iproute2 netns name: foo)
> + ip -n bar netns list-id target-nsid 31 nsid 32
> nsid 12 current-nsid 32 (iproute2 netns name: foo)
> + ip netns list-id nsid 13
> nsid 13 (iproute2 netns name: bar)
>
> CC: Petr Oros <poros@...hat.com>
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> ---
> include/libnetlink.h | 5 +-
> ip/ip_common.h | 1 +
> ip/ipnetns.c | 115 +++++++++++++++++++++++++++++++++++++++++--
> lib/libnetlink.c | 15 ++++--
> 4 files changed, 126 insertions(+), 10 deletions(-)
>
> diff --git a/include/libnetlink.h b/include/libnetlink.h
> index 311cf3fc90f8..8ebdc6d3d03e 100644
> --- a/include/libnetlink.h
> +++ b/include/libnetlink.h
> @@ -71,8 +71,6 @@ int rtnl_mdbdump_req(struct rtnl_handle *rth, int family)
> __attribute__((warn_unused_result));
> int rtnl_netconfdump_req(struct rtnl_handle *rth, int family)
> __attribute__((warn_unused_result));
> -int rtnl_nsiddump_req(struct rtnl_handle *rth, int family)
> - __attribute__((warn_unused_result));
>
> int rtnl_linkdump_req(struct rtnl_handle *rth, int fam)
> __attribute__((warn_unused_result));
> @@ -85,6 +83,9 @@ int rtnl_linkdump_req_filter_fn(struct rtnl_handle *rth, int fam,
> int rtnl_fdb_linkdump_req_filter_fn(struct rtnl_handle *rth,
> req_filter_fn_t filter_fn)
> __attribute__((warn_unused_result));
> +int rtnl_nsiddump_req_filter_fn(struct rtnl_handle *rth, int family,
> + req_filter_fn_t filter_fn)
> + __attribute__((warn_unused_result));
> int rtnl_statsdump_req_filter(struct rtnl_handle *rth, int fam, __u32 filt_mask)
> __attribute__((warn_unused_result));
> int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
> diff --git a/ip/ip_common.h b/ip/ip_common.h
> index cd916ec87c26..879287e3e506 100644
> --- a/ip/ip_common.h
> +++ b/ip/ip_common.h
> @@ -24,6 +24,7 @@ struct link_filter {
> int master;
> char *kind;
> char *slave_kind;
> + int target_nsid;
> };
>
> int get_operstate(const char *name);
> diff --git a/ip/ipnetns.c b/ip/ipnetns.c
> index a883f210d7ba..20110ef0f58e 100644
> --- a/ip/ipnetns.c
> +++ b/ip/ipnetns.c
> @@ -36,7 +36,7 @@ static int usage(void)
> " ip netns pids NAME\n"
> " ip [-all] netns exec [NAME] cmd ...\n"
> " ip netns monitor\n"
> - " ip netns list-id\n"
> + " ip netns list-id [target-nsid POSITIVE-INT] [nsid POSITIVE-INT]\n"
> "NETNSID := auto | POSITIVE-INT\n");
> exit(-1);
> }
> @@ -46,6 +46,7 @@ static struct rtnl_handle rtnsh = { .fd = -1 };
>
> static int have_rtnl_getnsid = -1;
> static int saved_netns = -1;
> +static struct link_filter filter;
>
> static int ipnetns_accept_msg(struct rtnl_ctrl_data *ctrl,
> struct nlmsghdr *n, void *arg)
> @@ -294,7 +295,7 @@ int print_nsid(struct nlmsghdr *n, void *arg)
> FILE *fp = (FILE *)arg;
> struct nsid_cache *c;
> char name[NAME_MAX];
> - int nsid;
> + int nsid, current;
>
> if (n->nlmsg_type != RTM_NEWNSID && n->nlmsg_type != RTM_DELNSID)
> return 0;
> @@ -317,9 +318,22 @@ int print_nsid(struct nlmsghdr *n, void *arg)
> print_bool(PRINT_ANY, "deleted", "Deleted ", true);
>
> nsid = rta_getattr_u32(tb[NETNSA_NSID]);
> - print_uint(PRINT_ANY, "nsid", "nsid %u ", nsid);
> + if (nsid < 0)
> + print_string(PRINT_ANY, "nsid", "nsid %s ", "not-assigned");
> + else
> + print_uint(PRINT_ANY, "nsid", "nsid %u ", nsid);
> +
> + if (tb[NETNSA_CURRENT_NSID]) {
> + current = rta_getattr_u32(tb[NETNSA_CURRENT_NSID]);
> + if (current < 0)
> + print_string(PRINT_ANY, "current-nsid",
> + "current-nsid %s ", "not-assigned");
> + else
> + print_uint(PRINT_ANY, "current-nsid",
> + "current-nsid %u ", current);
> + }
>
> - c = netns_map_get_by_nsid(nsid);
> + c = netns_map_get_by_nsid(tb[NETNSA_CURRENT_NSID] ? current : nsid);
> if (c != NULL) {
> print_string(PRINT_ANY, "name",
> "(iproute2 netns name: %s)", c->name);
> @@ -340,15 +354,106 @@ int print_nsid(struct nlmsghdr *n, void *arg)
> return 0;
> }
>
> +static int get_netnsid_from_netnsid(int nsid)
> +{
> + struct {
> + struct nlmsghdr n;
> + struct rtgenmsg g;
> + char buf[1024];
> + } req = {
> + .n.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct rtgenmsg))),
> + .n.nlmsg_flags = NLM_F_REQUEST,
> + .n.nlmsg_type = RTM_GETNSID,
> + .g.rtgen_family = AF_UNSPEC,
> + };
> + struct nlmsghdr *answer;
> + int err;
> +
> + netns_nsid_socket_init();
> +
> + err = addattr32(&req.n, sizeof(req), NETNSA_NSID, nsid);
> + if (err)
> + return err;
> +
> + if (filter.target_nsid >= 0) {
> + err = addattr32(&req.n, sizeof(req), NETNSA_TARGET_NSID,
> + filter.target_nsid);
> + if (err)
> + return err;
> + }
> +
> + if (rtnl_talk(&rtnsh, &req.n, &answer) < 0)
> + return -2;
> +
> + /* Validate message and parse attributes */
> + if (answer->nlmsg_type == NLMSG_ERROR)
> + goto err_out;
> +
> + new_json_obj(json);
> + err = print_nsid(answer, stdout);
> + delete_json_obj();
> +err_out:
> + free(answer);
> + return err;
> +}
> +
> +static int netns_filter_req(struct nlmsghdr *nlh, int reqlen)
> +{
> + int err;
> +
> + if (filter.target_nsid >= 0) {
> + err = addattr32(nlh, reqlen, NETNSA_TARGET_NSID,
> + filter.target_nsid);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> static int netns_list_id(int argc, char **argv)
> {
> + int nsid = -1;
> +
> if (!ipnetns_have_nsid()) {
> fprintf(stderr,
> "RTM_GETNSID is not supported by the kernel.\n");
> return -ENOTSUP;
> }
>
> - if (rtnl_nsiddump_req(&rth, AF_UNSPEC) < 0) {
> + filter.target_nsid = -1;
> + while (argc > 0) {
> + if (strcmp(*argv, "target-nsid") == 0) {
> + if (filter.target_nsid >= 0)
> + duparg("target-nsid", *argv);
> + NEXT_ARG();
> +
> + if (get_integer(&filter.target_nsid, *argv, 0))
> + invarg("\"target-nsid\" value is invalid\n",
> + *argv);
> + else if (filter.target_nsid < 0)
> + invarg("\"target-nsid\" value should be >= 0\n",
> + argv[1]);
> + } else if (strcmp(*argv, "nsid") == 0) {
> + if (nsid >= 0)
> + duparg("nsid", *argv);
> + NEXT_ARG();
> +
> + if (get_integer(&nsid, *argv, 0))
> + invarg("\"nsid\" value is invalid\n", *argv);
> + else if (nsid < 0)
> + invarg("\"nsid\" value should be >= 0\n",
> + argv[1]);
> + } else
> + usage();
> + argc--; argv++;
> + }
> +
> + if (nsid >= 0)
> + return get_netnsid_from_netnsid(nsid);
> +
> + if (rtnl_nsiddump_req_filter_fn(&rth, AF_UNSPEC,
> + netns_filter_req) < 0) {
> perror("Cannot send dump request");
> exit(1);
> }
> diff --git a/lib/libnetlink.c b/lib/libnetlink.c
> index 8c490f896326..6ce8b199f441 100644
> --- a/lib/libnetlink.c
> +++ b/lib/libnetlink.c
> @@ -438,12 +438,13 @@ int rtnl_netconfdump_req(struct rtnl_handle *rth, int family)
> return send(rth->fd, &req, sizeof(req), 0);
> }
>
> -int rtnl_nsiddump_req(struct rtnl_handle *rth, int family)
> +int rtnl_nsiddump_req_filter_fn(struct rtnl_handle *rth, int family,
> + req_filter_fn_t filter_fn)
> {
> struct {
> struct nlmsghdr nlh;
> struct rtgenmsg rtm;
> - char buf[0] __aligned(NLMSG_ALIGNTO);
> + char buf[1024];
> } req = {
> .nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct rtgenmsg))),
> .nlh.nlmsg_type = RTM_GETNSID,
> @@ -451,8 +452,16 @@ int rtnl_nsiddump_req(struct rtnl_handle *rth, int family)
> .nlh.nlmsg_seq = rth->dump = ++rth->seq,
> .rtm.rtgen_family = family,
> };
> + int err;
>
> - return send(rth->fd, &req, sizeof(req), 0);
> + 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);
> }
>
> static int __rtnl_linkdump_req(struct rtnl_handle *rth, int family)
Works great. Thanks, Nicolas.
Tested-by: Petr Oros <poros@...hat.com>
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