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bpf: sockmap: Add UDP support

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Allow adding hashed UDP sockets to sockmaps.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200309111243.6982-9-lmb@cloudflare.com
This commit is contained in:
Lorenz Bauer 2020-03-09 11:12:39 +00:00 committed by Daniel Borkmann
parent edc6741cc6
commit 7b98cd42b0
1 changed files with 33 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

33
net/core/sock_map.c
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@ -11,6 +11,7 @@
#include <linux/list.h> #include <linux/list.h>
#include <linux/jhash.h> #include <linux/jhash.h>
#include <linux/sock_diag.h> #include <linux/sock_diag.h>
#include <net/udp.h>
struct bpf_stab { struct bpf_stab {
struct bpf_map map; struct bpf_map map;
@ -147,7 +148,19 @@ static int sock_map_init_proto(struct sock *sk, struct sk_psock *psock)
sock_owned_by_me(sk); sock_owned_by_me(sk);
switch (sk->sk_type) {
case SOCK_STREAM:
prot = tcp_bpf_get_proto(sk, psock); prot = tcp_bpf_get_proto(sk, psock);
break;
case SOCK_DGRAM:
prot = udp_bpf_get_proto(sk, psock);
break;
default:
return -EINVAL;
}
if (IS_ERR(prot)) if (IS_ERR(prot))
return PTR_ERR(prot); return PTR_ERR(prot);
@ -162,7 +175,7 @@ static struct sk_psock *sock_map_psock_get_checked(struct sock *sk)
rcu_read_lock(); rcu_read_lock();
psock = sk_psock(sk); psock = sk_psock(sk);
if (psock) { if (psock) {
if (sk->sk_prot->recvmsg != tcp_bpf_recvmsg) { if (sk->sk_prot->close != sock_map_close) {
psock = ERR_PTR(-EBUSY); psock = ERR_PTR(-EBUSY);
goto out; goto out;
} }
@ -474,15 +487,31 @@ static bool sock_map_op_okay(const struct bpf_sock_ops_kern *ops)
ops->op == BPF_SOCK_OPS_TCP_LISTEN_CB; ops->op == BPF_SOCK_OPS_TCP_LISTEN_CB;
} }
static bool sock_map_sk_is_suitable(const struct sock *sk) static bool sk_is_tcp(const struct sock *sk)
{ {
return sk->sk_type == SOCK_STREAM && return sk->sk_type == SOCK_STREAM &&
sk->sk_protocol == IPPROTO_TCP; sk->sk_protocol == IPPROTO_TCP;
} }
static bool sk_is_udp(const struct sock *sk)
{
return sk->sk_type == SOCK_DGRAM &&
sk->sk_protocol == IPPROTO_UDP;
}
static bool sock_map_sk_is_suitable(const struct sock *sk)
{
return sk_is_tcp(sk) || sk_is_udp(sk);
}
static bool sock_map_sk_state_allowed(const struct sock *sk) static bool sock_map_sk_state_allowed(const struct sock *sk)
{ {
if (sk_is_tcp(sk))
return (1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_LISTEN); return (1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_LISTEN);
else if (sk_is_udp(sk))
return sk_hashed(sk);
return false;
} }
static int sock_map_update_elem(struct bpf_map *map, void *key, static int sock_map_update_elem(struct bpf_map *map, void *key,