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Message-Id: <20190801081133.13200-3-danieltimlee@gmail.com>
Date: Thu, 1 Aug 2019 17:11:33 +0900
From: "Daniel T. Lee" <danieltimlee@...il.com>
To: Daniel Borkmann <daniel@...earbox.net>,
Alexei Starovoitov <ast@...nel.org>
Cc: netdev@...r.kernel.org
Subject: [v2,2/2] tools: bpftool: add net detach command to detach XDP on interface
By this commit, using `bpftool net detach`, the attached XDP prog can
be detached. Detaching the BPF prog will be done through libbpf
'bpf_set_link_xdp_fd' with the progfd set to -1.
Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
---
Changes in v2:
- command 'unload' changed to 'detach' for the consistency
tools/bpf/bpftool/net.c | 55 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 54 insertions(+), 1 deletion(-)
diff --git a/tools/bpf/bpftool/net.c b/tools/bpf/bpftool/net.c
index f3b57660b303..2ae9a613b05c 100644
--- a/tools/bpf/bpftool/net.c
+++ b/tools/bpf/bpftool/net.c
@@ -281,6 +281,31 @@ static int parse_attach_args(int argc, char **argv, int *progfd,
return 0;
}
+static int parse_detach_args(int argc, char **argv,
+ enum net_attach_type *attach_type, int *ifindex)
+{
+ if (!REQ_ARGS(2))
+ return -EINVAL;
+
+ *attach_type = parse_attach_type(*argv);
+ if (*attach_type == __MAX_NET_ATTACH_TYPE) {
+ p_err("invalid net attach/detach type");
+ return -EINVAL;
+ }
+
+ NEXT_ARG();
+ if (!REQ_ARGS(1))
+ return -EINVAL;
+
+ *ifindex = if_nametoindex(*argv);
+ if (!*ifindex) {
+ p_err("Invalid ifname");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int do_attach_detach_xdp(int *progfd, enum net_attach_type *attach_type,
int *ifindex)
{
@@ -323,6 +348,31 @@ static int do_attach(int argc, char **argv)
return 0;
}
+static int do_detach(int argc, char **argv)
+{
+ enum net_attach_type attach_type;
+ int err, progfd, ifindex;
+
+ err = parse_detach_args(argc, argv, &attach_type, &ifindex);
+ if (err)
+ return err;
+
+ /* to detach xdp prog */
+ progfd = -1;
+ if (is_prefix("xdp", attach_type_strings[attach_type]))
+ err = do_attach_detach_xdp(&progfd, &attach_type, &ifindex);
+
+ if (err < 0) {
+ p_err("link set %s failed", attach_type_strings[attach_type]);
+ return -1;
+ }
+
+ if (json_output)
+ jsonw_null(json_wtr);
+
+ return 0;
+}
+
static int do_show(int argc, char **argv)
{
struct bpf_attach_info attach_info = {};
@@ -406,6 +456,7 @@ static int do_help(int argc, char **argv)
fprintf(stderr,
"Usage: %s %s { show | list } [dev <devname>]\n"
" %s %s attach PROG LOAD_TYPE <devname>\n"
+ " %s %s detach LOAD_TYPE <devname>\n"
" %s %s help\n"
"\n"
" " HELP_SPEC_PROGRAM "\n"
@@ -415,7 +466,8 @@ static int do_help(int argc, char **argv)
" to dump program attachments. For program types\n"
" sk_{filter,skb,msg,reuseport} and lwt/seg6, please\n"
" consult iproute2.\n",
- bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2]);
+ bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
+ bin_name, argv[-2]);
return 0;
}
@@ -424,6 +476,7 @@ static const struct cmd cmds[] = {
{ "show", do_show },
{ "list", do_show },
{ "attach", do_attach },
+ { "detach", do_detach },
{ "help", do_help },
{ 0 }
};
--
2.20.1
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