From: Jakub Sitnicki <jakub@cloudflare.com>
To: netdev@vger.kernel.org, bpf@vger.kernel.org
Cc: dccp@vger.kernel.org, kernel-team@cloudflare.com,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Gerrit Renker <gerrit@erg.abdn.ac.uk>,
Jakub Kicinski <kuba@kernel.org>,
Marek Majkowski <marek@cloudflare.com>,
Lorenz Bauer <lmb@cloudflare.com>
Subject: [PATCH bpf-next 07/17] inet6: Run SK_LOOKUP BPF program on socket lookup
Date: Wed, 6 May 2020 14:55:03 +0200 [thread overview]
Message-ID: <20200506125514.1020829-8-jakub@cloudflare.com> (raw)
In-Reply-To: <20200506125514.1020829-1-jakub@cloudflare.com>
Following ipv4 stack changes, run a BPF program attached to netns before
looking up a listening socket. Program can return a listening socket to use
as result of socket lookup, fail the lookup, or take no action.
Suggested-by: Marek Majkowski <marek@cloudflare.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
---
include/net/inet6_hashtables.h | 20 ++++++++++++++++++++
net/ipv6/inet6_hashtables.c | 15 ++++++++++++++-
2 files changed, 34 insertions(+), 1 deletion(-)
diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index 81b965953036..8b8c0cb92ea8 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -21,6 +21,7 @@
#include <net/ipv6.h>
#include <net/netns/hash.h>
+#include <net/inet_hashtables.h>
struct inet_hashinfo;
@@ -103,6 +104,25 @@ struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
const int dif);
int inet6_hash(struct sock *sk);
+
+static inline struct sock *inet6_lookup_run_bpf(struct net *net, u8 protocol,
+ const struct in6_addr *saddr,
+ __be16 sport,
+ const struct in6_addr *daddr,
+ u16 dport)
+{
+ struct bpf_sk_lookup_kern ctx = {
+ .family = AF_INET6,
+ .protocol = protocol,
+ .v6.saddr = *saddr,
+ .v6.daddr = *daddr,
+ .sport = sport,
+ .dport = dport,
+ };
+
+ return bpf_sk_lookup_run(net, &ctx);
+}
+
#endif /* IS_ENABLED(CONFIG_IPV6) */
#define INET6_MATCH(__sk, __net, __saddr, __daddr, __ports, __dif, __sdif) \
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 03942eef8ab6..6d91de89fd2b 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -167,9 +167,22 @@ struct sock *inet6_lookup_listener(struct net *net,
const unsigned short hnum, const int dif, const int sdif)
{
struct inet_listen_hashbucket *ilb2;
- struct sock *result = NULL;
+ struct sock *result, *reuse_sk;
unsigned int hash2;
+ /* Lookup redirect from BPF */
+ result = inet6_lookup_run_bpf(net, hashinfo->protocol,
+ saddr, sport, daddr, hnum);
+ if (IS_ERR(result))
+ return NULL;
+ if (result) {
+ reuse_sk = lookup_reuseport(net, result, skb, doff,
+ saddr, sport, daddr, hnum);
+ if (reuse_sk)
+ result = reuse_sk;
+ goto done;
+ }
+
hash2 = ipv6_portaddr_hash(net, daddr, hnum);
ilb2 = inet_lhash2_bucket(hashinfo, hash2);
--
2.25.3
next prev parent reply other threads:[~2020-05-06 12:55 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-06 12:54 [PATCH bpf-next 00/17] Run a BPF program on socket lookup Jakub Sitnicki
2020-05-06 12:54 ` [PATCH bpf-next 01/17] flow_dissector: Extract attach/detach/query helpers Jakub Sitnicki
2020-05-06 12:54 ` [PATCH bpf-next 02/17] bpf: Introduce SK_LOOKUP program type with a dedicated attach point Jakub Sitnicki
2020-05-06 13:16 ` Lorenz Bauer
2020-05-06 13:53 ` Jakub Sitnicki
2020-05-07 20:55 ` Martin KaFai Lau
2020-05-08 8:54 ` Jakub Sitnicki
2020-05-08 7:06 ` Martin KaFai Lau
2020-05-08 10:45 ` Jakub Sitnicki
2020-05-08 18:39 ` Martin KaFai Lau
2020-05-11 9:08 ` Jakub Sitnicki
2020-05-11 18:59 ` Martin KaFai Lau
2020-05-11 19:26 ` Jakub Sitnicki
2020-05-11 20:54 ` Martin KaFai Lau
2020-05-12 14:16 ` Jakub Sitnicki
2020-05-06 12:54 ` [PATCH bpf-next 03/17] inet: Store layer 4 protocol in inet_hashinfo Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 04/17] inet: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 05/17] inet: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 06/17] inet6: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-06 12:55 ` Jakub Sitnicki [this message]
2020-05-06 12:55 ` [PATCH bpf-next 08/17] udp: Store layer 4 protocol in udp_table Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 09/17] udp: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 10/17] udp: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 11/17] udp6: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 12/17] udp6: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 13/17] bpf: Sync linux/bpf.h to tools/ Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 14/17] libbpf: Add support for SK_LOOKUP program type Jakub Sitnicki
2020-05-08 17:41 ` Andrii Nakryiko
2020-05-08 17:52 ` Yonghong Song
2020-05-08 17:59 ` Andrii Nakryiko
2020-05-11 8:12 ` Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 15/17] selftests/bpf: Add verifier tests for bpf_sk_lookup context access Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 16/17] selftests/bpf: Rename test_sk_lookup_kern.c to test_ref_track_kern.c Jakub Sitnicki
2020-05-06 12:55 ` [PATCH bpf-next 17/17] selftests/bpf: Tests for BPF_SK_LOOKUP attach point Jakub Sitnicki
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