netdev - Re: [PATCH iproute2-next 5/9] libnetlink: Add helper to create nexthop dump request

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Date:   Thu, 30 May 2019 12:56:54 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     David Ahern <dsahern@...nel.org>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        netdev <netdev@...r.kernel.org>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH iproute2-next 5/9] libnetlink: Add helper to create
 nexthop dump request

On Wed, May 29, 2019 at 9:04 PM David Ahern <dsahern@...nel.org> wrote:
>
> From: David Ahern <dsahern@...il.com>
>
> Add rtnl_nexthopdump_req to initiate a dump request of nexthop objects.
>
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  include/libnetlink.h |  4 ++++
>  lib/libnetlink.c     | 27 +++++++++++++++++++++++++++
>  2 files changed, 31 insertions(+)
>
> diff --git a/include/libnetlink.h b/include/libnetlink.h
> index 599b2c592f68..1ddba8dcd220 100644
> --- a/include/libnetlink.h
> +++ b/include/libnetlink.h
> @@ -93,6 +93,10 @@ int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
>  int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
>         __attribute__((warn_unused_result));
>
> +int rtnl_nexthopdump_req(struct rtnl_handle *rth, int family,
> +                        req_filter_fn_t filter_fn)
> +       __attribute__((warn_unused_result));
> +
>  struct rtnl_ctrl_data {
>         int     nsid;
>  };
> diff --git a/lib/libnetlink.c b/lib/libnetlink.c
> index eb85bbdf01ee..c1cdda3b8d4e 100644
> --- a/lib/libnetlink.c
> +++ b/lib/libnetlink.c
> @@ -25,6 +25,7 @@
>  #include <linux/fib_rules.h>
>  #include <linux/if_addrlabel.h>
>  #include <linux/if_bridge.h>
> +#include <linux/nexthop.h>
>
>  #include "libnetlink.h"
>
> @@ -252,6 +253,32 @@ int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
>         return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
>  }
>
> +int rtnl_nexthopdump_req(struct rtnl_handle *rth, int family,
> +                        req_filter_fn_t filter_fn)
> +{
> +       struct {
> +               struct nlmsghdr nlh;
> +               struct nhmsg nhm;
> +               char buf[128];
> +       } req = {
> +               .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),

sizeof(struct nhmsg) ?


> +               .nlh.nlmsg_type = RTM_GETNEXTHOP,
> +               .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
> +               .nlh.nlmsg_seq = rth->dump = ++rth->seq,
> +               .nhm.nh_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_addrdump_req(struct rtnl_handle *rth, int family,
>                       req_filter_fn_t filter_fn)
>  {
> --
> 2.11.0
>