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bpf: Allow bpf_{s,g}etsockopt from cgroup bind{4,6} hooks

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I have to now lock/unlock socket for the bind hook execution.
That shouldn't cause any overhead because the socket is unbound
and shouldn't receive any traffic.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrey Ignatov <rdna@fb.com>
Link: https://lore.kernel.org/bpf/20201202172516.3483656-3-sdf@google.com
This commit is contained in:
Stanislav Fomichev 2020-12-02 09:25:15 -08:00 • committed by Alexei Starovoitov
parent a999696c54
commit 427167c0b0
4 changed files with 12 additions and 8 deletions
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12
include/linux/bpf-cgroup.h
View file

@ -246,11 +246,11 @@ int bpf_percpu_cgroup_storage_update(struct bpf_map *map, void *key,
__ret; \ __ret; \
}) })
#define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) \ #define BPF_CGROUP_RUN_PROG_INET4_BIND_LOCK(sk, uaddr) \
BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET4_BIND) BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET4_BIND, NULL)
#define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) \ #define BPF_CGROUP_RUN_PROG_INET6_BIND_LOCK(sk, uaddr) \
BPF_CGROUP_RUN_SA_PROG(sk, uaddr, BPF_CGROUP_INET6_BIND) BPF_CGROUP_RUN_SA_PROG_LOCK(sk, uaddr, BPF_CGROUP_INET6_BIND, NULL)
#define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \ #define BPF_CGROUP_PRE_CONNECT_ENABLED(sk) (cgroup_bpf_enabled && \
sk->sk_prot->pre_connect) sk->sk_prot->pre_connect)
@ -434,8 +434,8 @@ static inline int bpf_percpu_cgroup_storage_update(struct bpf_map *map,
#define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; }) #define BPF_CGROUP_RUN_PROG_INET_EGRESS(sk,skb) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; }) #define BPF_CGROUP_RUN_PROG_INET_SOCK(sk) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk) ({ 0; }) #define BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr) ({ 0; }) #define BPF_CGROUP_RUN_PROG_INET4_BIND_LOCK(sk, uaddr) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr) ({ 0; }) #define BPF_CGROUP_RUN_PROG_INET6_BIND_LOCK(sk, uaddr) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; }) #define BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; }) #define BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk) ({ 0; })
#define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; }) #define BPF_CGROUP_RUN_PROG_INET4_CONNECT(sk, uaddr) ({ 0; })

4
net/core/filter.c
View file

@ -6995,6 +6995,8 @@ sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_sk_storage_delete_proto; return &bpf_sk_storage_delete_proto;
case BPF_FUNC_setsockopt: case BPF_FUNC_setsockopt:
switch (prog->expected_attach_type) { switch (prog->expected_attach_type) {
case BPF_CGROUP_INET4_BIND:
case BPF_CGROUP_INET6_BIND:
case BPF_CGROUP_INET4_CONNECT: case BPF_CGROUP_INET4_CONNECT:
case BPF_CGROUP_INET6_CONNECT: case BPF_CGROUP_INET6_CONNECT:
return &bpf_sock_addr_setsockopt_proto; return &bpf_sock_addr_setsockopt_proto;
@ -7003,6 +7005,8 @@ sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
} }
case BPF_FUNC_getsockopt: case BPF_FUNC_getsockopt:
switch (prog->expected_attach_type) { switch (prog->expected_attach_type) {
case BPF_CGROUP_INET4_BIND:
case BPF_CGROUP_INET6_BIND:
case BPF_CGROUP_INET4_CONNECT: case BPF_CGROUP_INET4_CONNECT:
case BPF_CGROUP_INET6_CONNECT: case BPF_CGROUP_INET6_CONNECT:
return &bpf_sock_addr_getsockopt_proto; return &bpf_sock_addr_getsockopt_proto;

2
net/ipv4/af_inet.c
View file

@ -450,7 +450,7 @@ int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
/* BPF prog is run before any checks are done so that if the prog /* BPF prog is run before any checks are done so that if the prog
* changes context in a wrong way it will be caught. * changes context in a wrong way it will be caught.
*/ */
err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr); err = BPF_CGROUP_RUN_PROG_INET4_BIND_LOCK(sk, uaddr);
if (err) if (err)
return err; return err;

2
net/ipv6/af_inet6.c
View file

@ -451,7 +451,7 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
/* BPF prog is run before any checks are done so that if the prog /* BPF prog is run before any checks are done so that if the prog
* changes context in a wrong way it will be caught. * changes context in a wrong way it will be caught.
*/ */
err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr); err = BPF_CGROUP_RUN_PROG_INET6_BIND_LOCK(sk, uaddr);
if (err) if (err)
return err; return err;