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Diffstat (limited to 'net')
-rw-r--r--net/core/filter.c151
1 files changed, 151 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index b2cb186252e4..591c698bc517 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -58,13 +58,17 @@
#include <net/busy_poll.h>
#include <net/tcp.h>
#include <net/xfrm.h>
+#include <net/udp.h>
#include <linux/bpf_trace.h>
#include <net/xdp_sock.h>
#include <linux/inetdevice.h>
+#include <net/inet_hashtables.h>
+#include <net/inet6_hashtables.h>
#include <net/ip_fib.h>
#include <net/flow.h>
#include <net/arp.h>
#include <net/ipv6.h>
+#include <net/net_namespace.h>
#include <linux/seg6_local.h>
#include <net/seg6.h>
#include <net/seg6_local.h>
@@ -4813,6 +4817,141 @@ static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = {
};
#endif /* CONFIG_IPV6_SEG6_BPF */
+struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
+ struct sk_buff *skb, u8 family, u8 proto)
+{
+ int dif = skb->dev->ifindex;
+ bool refcounted = false;
+ struct sock *sk = NULL;
+
+ if (family == AF_INET) {
+ __be32 src4 = tuple->ipv4.saddr;
+ __be32 dst4 = tuple->ipv4.daddr;
+ int sdif = inet_sdif(skb);
+
+ if (proto == IPPROTO_TCP)
+ sk = __inet_lookup(net, &tcp_hashinfo, skb, 0,
+ src4, tuple->ipv4.sport,
+ dst4, tuple->ipv4.dport,
+ dif, sdif, &refcounted);
+ else
+ sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport,
+ dst4, tuple->ipv4.dport,
+ dif, sdif, &udp_table, skb);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr;
+ struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr;
+ int sdif = inet6_sdif(skb);
+
+ if (proto == IPPROTO_TCP)
+ sk = __inet6_lookup(net, &tcp_hashinfo, skb, 0,
+ src6, tuple->ipv6.sport,
+ dst6, tuple->ipv6.dport,
+ dif, sdif, &refcounted);
+ else
+ sk = __udp6_lib_lookup(net, src6, tuple->ipv6.sport,
+ dst6, tuple->ipv6.dport,
+ dif, sdif, &udp_table, skb);
+#endif
+ }
+
+ if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) {
+ WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
+ sk = NULL;
+ }
+ return sk;
+}
+
+/* bpf_sk_lookup performs the core lookup for different types of sockets,
+ * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
+ * Returns the socket as an 'unsigned long' to simplify the casting in the
+ * callers to satisfy BPF_CALL declarations.
+ */
+static unsigned long
+bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
+ u8 proto, u64 netns_id, u64 flags)
+{
+ struct net *caller_net;
+ struct sock *sk = NULL;
+ u8 family = AF_UNSPEC;
+ struct net *net;
+
+ family = len == sizeof(tuple->ipv4) ? AF_INET : AF_INET6;
+ if (unlikely(family == AF_UNSPEC || netns_id > U32_MAX || flags))
+ goto out;
+
+ if (skb->dev)
+ caller_net = dev_net(skb->dev);
+ else
+ caller_net = sock_net(skb->sk);
+ if (netns_id) {
+ net = get_net_ns_by_id(caller_net, netns_id);
+ if (unlikely(!net))
+ goto out;
+ sk = sk_lookup(net, tuple, skb, family, proto);
+ put_net(net);
+ } else {
+ net = caller_net;
+ sk = sk_lookup(net, tuple, skb, family, proto);
+ }
+
+ if (sk)
+ sk = sk_to_full_sk(sk);
+out:
+ return (unsigned long) sk;
+}
+
+BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb,
+ struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
+{
+ return bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, netns_id, flags);
+}
+
+static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = {
+ .func = bpf_sk_lookup_tcp,
+ .gpl_only = false,
+ .pkt_access = true,
+ .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
+ .arg1_type = ARG_PTR_TO_CTX,
+ .arg2_type = ARG_PTR_TO_MEM,
+ .arg3_type = ARG_CONST_SIZE,
+ .arg4_type = ARG_ANYTHING,
+ .arg5_type = ARG_ANYTHING,
+};
+
+BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb,
+ struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
+{
+ return bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, netns_id, flags);
+}
+
+static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
+ .func = bpf_sk_lookup_udp,
+ .gpl_only = false,
+ .pkt_access = true,
+ .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
+ .arg1_type = ARG_PTR_TO_CTX,
+ .arg2_type = ARG_PTR_TO_MEM,
+ .arg3_type = ARG_CONST_SIZE,
+ .arg4_type = ARG_ANYTHING,
+ .arg5_type = ARG_ANYTHING,
+};
+
+BPF_CALL_1(bpf_sk_release, struct sock *, sk)
+{
+ if (!sock_flag(sk, SOCK_RCU_FREE))
+ sock_gen_put(sk);
+ return 0;
+}
+
+static const struct bpf_func_proto bpf_sk_release_proto = {
+ .func = bpf_sk_release,
+ .gpl_only = false,
+ .ret_type = RET_INTEGER,
+ .arg1_type = ARG_PTR_TO_SOCKET,
+};
+
bool bpf_helper_changes_pkt_data(void *func)
{
if (func == bpf_skb_vlan_push ||
@@ -5019,6 +5158,12 @@ tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
case BPF_FUNC_skb_ancestor_cgroup_id:
return &bpf_skb_ancestor_cgroup_id_proto;
#endif
+ case BPF_FUNC_sk_lookup_tcp:
+ return &bpf_sk_lookup_tcp_proto;
+ case BPF_FUNC_sk_lookup_udp:
+ return &bpf_sk_lookup_udp_proto;
+ case BPF_FUNC_sk_release:
+ return &bpf_sk_release_proto;
default:
return bpf_base_func_proto(func_id);
}
@@ -5119,6 +5264,12 @@ sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_sk_redirect_hash_proto;
case BPF_FUNC_get_local_storage:
return &bpf_get_local_storage_proto;
+ case BPF_FUNC_sk_lookup_tcp:
+ return &bpf_sk_lookup_tcp_proto;
+ case BPF_FUNC_sk_lookup_udp:
+ return &bpf_sk_lookup_udp_proto;
+ case BPF_FUNC_sk_release:
+ return &bpf_sk_release_proto;
default:
return bpf_base_func_proto(func_id);
}