diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2016-11-28 23:16:54 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-30 10:27:20 -0500 |
| commit | 85de8576a0b14aecc99136cfbf90e367fa2142cb (patch) | |
| tree | 30b716ce4c318a241ef2456bf2ed1be29991bcab /net/core/rtnetlink.c | |
| parent | 0f29f05bd7064bdf0c9629511bcba7650ce364d5 (diff) | |
bpf, xdp: allow to pass flags to dev_change_xdp_fd
Add an IFLA_XDP_FLAGS attribute that can be passed for setting up
XDP along with IFLA_XDP_FD, which eventually allows user space to
implement typical add/replace/delete logic for programs. Right now,
calling into dev_change_xdp_fd() will always replace previous programs.
When passed XDP_FLAGS_UPDATE_IF_NOEXIST, we can handle this more
graceful when requested by returning -EBUSY in case we try to
attach a new program, but we find that another one is already
attached. This will be used by upcoming front-end for iproute2 as
well.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/rtnetlink.c')
| -rw-r--r-- | net/core/rtnetlink.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 4e60525ea586..bd85570e6e4b 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1505,6 +1505,7 @@ static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = { [IFLA_XDP_FD] = { .type = NLA_S32 }, [IFLA_XDP_ATTACHED] = { .type = NLA_U8 }, + [IFLA_XDP_FLAGS] = { .type = NLA_U32 }, }; static const struct rtnl_link_ops *linkinfo_to_kind_ops(const struct nlattr *nla) @@ -2164,6 +2165,7 @@ static int do_setlink(const struct sk_buff *skb, if (tb[IFLA_XDP]) { struct nlattr *xdp[IFLA_XDP_MAX + 1]; + u32 xdp_flags = 0; err = nla_parse_nested(xdp, IFLA_XDP_MAX, tb[IFLA_XDP], ifla_xdp_policy); @@ -2174,9 +2176,19 @@ static int do_setlink(const struct sk_buff *skb, err = -EINVAL; goto errout; } + + if (xdp[IFLA_XDP_FLAGS]) { + xdp_flags = nla_get_u32(xdp[IFLA_XDP_FLAGS]); + if (xdp_flags & ~XDP_FLAGS_MASK) { + err = -EINVAL; + goto errout; + } + } + if (xdp[IFLA_XDP_FD]) { err = dev_change_xdp_fd(dev, - nla_get_s32(xdp[IFLA_XDP_FD])); + nla_get_s32(xdp[IFLA_XDP_FD]), + xdp_flags); if (err) goto errout; status |= DO_SETLINK_NOTIFY; |