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Date: Thu, 17 Jan 2019 16:41:02 -0800
From: Stanislav Fomichev <sdf@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next 1/5] bpf: add BPF_CGROUP_INET{4,6}_SOCK_RELEASE hooks
These hooks mirror existing BPF_CGROUP_INET{4,6}_SOCK hooks (which
trigger upon socket creation), but trigger when the socket is closed.
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
include/linux/bpf-cgroup.h | 6 ++++++
include/net/inet_common.h | 1 +
include/uapi/linux/bpf.h | 2 ++
kernel/bpf/syscall.c | 8 ++++++++
net/core/filter.c | 7 +++++++
net/ipv4/af_inet.c | 13 ++++++++++++-
net/ipv6/af_inet6.c | 5 ++++-
7 files changed, 40 insertions(+), 2 deletions(-)
diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index 588dd5f0bd85..31fcfe215d80 100644
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -176,6 +176,12 @@ int bpf_percpu_cgroup_storage_update(struct bpf_map *map, void *key,
#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) \
BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET_SOCK_CREATE)
+#define BPF_CGROUP_RUN_PROG_INET4_SOCK_RELEASE(sk) \
+ BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_SOCK_RELEASE)
+
+#define BPF_CGROUP_RUN_PROG_INET6_SOCK_RELEASE(sk) \
+ BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET6_SOCK_RELEASE)
+
#define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) \
BPF_CGROUP_RUN_SK_PROG(sk, BPF_CGROUP_INET4_POST_BIND)
diff --git a/include/net/inet_common.h b/include/net/inet_common.h
index 975901a95c0f..0e64046afe30 100644
--- a/include/net/inet_common.h
+++ b/include/net/inet_common.h
@@ -17,6 +17,7 @@ struct sockaddr;
struct socket;
int inet_release(struct socket *sock);
+int __inet_release(struct socket *sock);
int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
int addr_len, int flags);
int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 91c43884f295..8e78aa28a42e 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -186,6 +186,8 @@ enum bpf_attach_type {
BPF_CGROUP_UDP6_SENDMSG,
BPF_LIRC_MODE2,
BPF_FLOW_DISSECTOR,
+ BPF_CGROUP_INET4_SOCK_RELEASE,
+ BPF_CGROUP_INET6_SOCK_RELEASE,
__MAX_BPF_ATTACH_TYPE
};
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index b155cd17c1bd..6fa113448580 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1417,6 +1417,8 @@ bpf_prog_load_check_attach_type(enum bpf_prog_type prog_type,
case BPF_PROG_TYPE_CGROUP_SOCK:
switch (expected_attach_type) {
case BPF_CGROUP_INET_SOCK_CREATE:
+ case BPF_CGROUP_INET4_SOCK_RELEASE:
+ case BPF_CGROUP_INET6_SOCK_RELEASE:
case BPF_CGROUP_INET4_POST_BIND:
case BPF_CGROUP_INET6_POST_BIND:
return 0;
@@ -1709,6 +1711,8 @@ static int bpf_prog_attach(const union bpf_attr *attr)
ptype = BPF_PROG_TYPE_CGROUP_SKB;
break;
case BPF_CGROUP_INET_SOCK_CREATE:
+ case BPF_CGROUP_INET4_SOCK_RELEASE:
+ case BPF_CGROUP_INET6_SOCK_RELEASE:
case BPF_CGROUP_INET4_POST_BIND:
case BPF_CGROUP_INET6_POST_BIND:
ptype = BPF_PROG_TYPE_CGROUP_SOCK;
@@ -1791,6 +1795,8 @@ static int bpf_prog_detach(const union bpf_attr *attr)
ptype = BPF_PROG_TYPE_CGROUP_SKB;
break;
case BPF_CGROUP_INET_SOCK_CREATE:
+ case BPF_CGROUP_INET4_SOCK_RELEASE:
+ case BPF_CGROUP_INET6_SOCK_RELEASE:
case BPF_CGROUP_INET4_POST_BIND:
case BPF_CGROUP_INET6_POST_BIND:
ptype = BPF_PROG_TYPE_CGROUP_SOCK;
@@ -1841,6 +1847,8 @@ static int bpf_prog_query(const union bpf_attr *attr,
case BPF_CGROUP_INET_INGRESS:
case BPF_CGROUP_INET_EGRESS:
case BPF_CGROUP_INET_SOCK_CREATE:
+ case BPF_CGROUP_INET4_SOCK_RELEASE:
+ case BPF_CGROUP_INET6_SOCK_RELEASE:
case BPF_CGROUP_INET4_BIND:
case BPF_CGROUP_INET6_BIND:
case BPF_CGROUP_INET4_POST_BIND:
diff --git a/net/core/filter.c b/net/core/filter.c
index 2b3b436ef545..b4da6793fdbc 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5885,12 +5885,16 @@ static bool __sock_filter_check_attach_type(int off,
switch (attach_type) {
case BPF_CGROUP_INET_SOCK_CREATE:
goto full_access;
+ case BPF_CGROUP_INET4_SOCK_RELEASE:
+ case BPF_CGROUP_INET6_SOCK_RELEASE:
+ goto read_only;
default:
return false;
}
case bpf_ctx_range(struct bpf_sock, src_ip4):
switch (attach_type) {
case BPF_CGROUP_INET4_POST_BIND:
+ case BPF_CGROUP_INET4_SOCK_RELEASE:
goto read_only;
default:
return false;
@@ -5898,6 +5902,7 @@ static bool __sock_filter_check_attach_type(int off,
case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
switch (attach_type) {
case BPF_CGROUP_INET6_POST_BIND:
+ case BPF_CGROUP_INET6_SOCK_RELEASE:
goto read_only;
default:
return false;
@@ -5906,6 +5911,8 @@ static bool __sock_filter_check_attach_type(int off,
switch (attach_type) {
case BPF_CGROUP_INET4_POST_BIND:
case BPF_CGROUP_INET6_POST_BIND:
+ case BPF_CGROUP_INET4_SOCK_RELEASE:
+ case BPF_CGROUP_INET6_SOCK_RELEASE:
goto read_only;
default:
return false;
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 0dfb72c46671..b703ad242365 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -403,7 +403,7 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
* function we are destroying the object and from then on nobody
* should refer to it.
*/
-int inet_release(struct socket *sock)
+int __inet_release(struct socket *sock)
{
struct sock *sk = sock->sk;
@@ -429,6 +429,17 @@ int inet_release(struct socket *sock)
}
return 0;
}
+EXPORT_SYMBOL(__inet_release);
+
+int inet_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ if (sk && !sk->sk_kern_sock)
+ BPF_CGROUP_RUN_PROG_INET4_SOCK_RELEASE(sk);
+
+ return __inet_release(sock);
+}
EXPORT_SYMBOL(inet_release);
int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index d99753b5e39b..44c86595eba8 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -464,13 +464,16 @@ int inet6_release(struct socket *sock)
if (!sk)
return -EINVAL;
+ if (!sk->sk_kern_sock)
+ BPF_CGROUP_RUN_PROG_INET6_SOCK_RELEASE(sock->sk);
+
/* Free mc lists */
ipv6_sock_mc_close(sk);
/* Free ac lists */
ipv6_sock_ac_close(sk);
- return inet_release(sock);
+ return __inet_release(sock);
}
EXPORT_SYMBOL(inet6_release);
--
2.20.1.321.g9e740568ce-goog
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