From fab60e29fcc6d60396da20d63d45fd0d305ba4e4 Mon Sep 17 00:00:00 2001 From: Xu Liu Date: Fri, 20 Aug 2021 15:17:11 +0800 Subject: [PATCH] bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_SK_MSG We'd like to be able to identify netns from sk_msg hooks to accelerate local process communication form different netns. Signed-off-by: Xu Liu Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20210820071712.52852-2-liuxu623@gmail.com --- net/core/filter.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/net/core/filter.c b/net/core/filter.c index 59b8f50..cfbd011 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4688,6 +4688,18 @@ static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = { .arg1_type = ARG_PTR_TO_CTX_OR_NULL, }; +BPF_CALL_1(bpf_get_netns_cookie_sk_msg, struct sk_msg *, ctx) +{ + return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); +} + +static const struct bpf_func_proto bpf_get_netns_cookie_sk_msg_proto = { + .func = bpf_get_netns_cookie_sk_msg, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX_OR_NULL, +}; + BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) { struct sock *sk = sk_to_full_sk(skb->sk); @@ -7551,6 +7563,8 @@ sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_sk_storage_get_proto; case BPF_FUNC_sk_storage_delete: return &bpf_sk_storage_delete_proto; + case BPF_FUNC_get_netns_cookie: + return &bpf_get_netns_cookie_sk_msg_proto; #ifdef CONFIG_CGROUPS case BPF_FUNC_get_current_cgroup_id: return &bpf_get_current_cgroup_id_proto; -- 2.7.4