diff options
| author | Chenbo Feng <fengc@google.com> | 2017-03-22 17:27:35 -0700 |
|---|---|---|
| committer | Michael Bestas <mkbestas@lineageos.org> | 2022-04-19 00:51:38 +0300 |
| commit | 1710f46491716938fbf538fb6643d77c676aa9c7 (patch) | |
| tree | 530b2e2c9e1c9b672b91ccc86c2702369db67aae | |
| parent | 7b8bf634ea1a7114d8929692860ef57d49ec7dc8 (diff) | |
BACKPORT: UPSTREAM: Add a eBPF helper function to retrieve socket uid
Cherry-pick from commit 6acc5c2910689fc6ee181bf63085c5efff6a42bd
Returns the owner uid of the socket inside a sk_buff. This is useful to
perform per-UID accounting of network traffic or per-UID packet
filtering. The socket need to be a fullsock otherwise overflowuid is
returned.
Signed-off-by: Chenbo Feng <fengc@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Bug: 30950746
Change-Id: Idc00947ccfdd4e9f2214ffc4178d701cd9ead0ac
Signed-off-by: Chatur27 <jasonbright2709@gmail.com>
| -rw-r--r-- | include/uapi/linux/bpf.h | 9 | ||||
| -rw-r--r-- | net/core/filter.c | 20 |
2 files changed, 29 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 92803fd8467d..5bac307880a6 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -543,6 +543,15 @@ enum bpf_func_id { */ BPF_FUNC_get_socket_cookie, + /** + * u32 bpf_get_socket_uid(skb) + * Get the owner uid of the socket stored inside sk_buff. + * @skb: pointer to skb + * Return: uid of the socket owner on success or 0 if the socket pointer + * inside sk_buff is NULL + */ + BPF_FUNC_get_socket_uid, + __BPF_FUNC_MAX_ID, }; diff --git a/net/core/filter.c b/net/core/filter.c index f75d8ad887ea..bfc5ab6ad10c 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -2498,6 +2498,24 @@ static const struct bpf_func_proto bpf_get_socket_cookie_proto = { .arg1_type = ARG_PTR_TO_CTX, }; +BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) +{ + struct sock *sk = sk_to_full_sk(skb->sk); + kuid_t kuid; + + if (!sk || !sk_fullsock(sk)) + return overflowuid; + kuid = sock_net_uid(sock_net(sk), sk); + return from_kuid_munged(sock_net(sk)->user_ns, kuid); +} + +static const struct bpf_func_proto bpf_get_socket_uid_proto = { + .func = bpf_get_socket_uid, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, +}; + static const struct bpf_func_proto * sk_filter_func_proto(enum bpf_func_id func_id) { @@ -2521,6 +2539,8 @@ sk_filter_func_proto(enum bpf_func_id func_id) return bpf_get_trace_printk_proto(); case BPF_FUNC_get_socket_cookie: return &bpf_get_socket_cookie_proto; + case BPF_FUNC_get_socket_uid: + return &bpf_get_socket_uid_proto; default: return NULL; } |