[PATCH bpf-next v4 0/7] Add SO_REUSEPORT support for TC bpf_sk_assign

[PATCH bpf-next v4 0/7] Add SO_REUSEPORT support for TC bpf_sk_assign

[Lorenz Bauer]

We want to replace iptables TPROXY with a BPF program at TC ingress.
To make this work in all cases we need to assign a SO_REUSEPORT socket
to an skb, which is currently prohibited. This series adds support for
such sockets to bpf_sk_assing.

I did some refactoring to cut down on the amount of duplicate code. The
key to this is to use INDIRECT_CALL in the reuseport helpers. To show
that this approach is not just beneficial to TC sk_assign I removed
duplicate code for bpf_sk_lookup as well.

Joint work with Daniel Borkmann.

Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
---
Changes in v4:
- WARN_ON_ONCE if reuseport socket is refcounted (Kuniyuki)
- Use inet[6]_ehashfn_t to shorten function declarations (Kuniyuki)
- Shuffle documentation patch around (Kuniyuki)
- Update commit message to explain why IPv6 needs EXPORT_SYMBOL
- Link to v3: https://lore.kernel.org/r/20230613-so-reuseport-v3-0-907b4cbb7b99@isovalent.com

Changes in v3:
- Fix warning re udp_ehashfn and udp6_ehashfn (Simon)
- Return higher scoring connected UDP reuseport sockets (Kuniyuki)
- Fix ipv6 module builds
- Link to v2: https://lore.kernel.org/r/20230613-so-reuseport-v2-0-b7c69a342613@isovalent.com

Changes in v2:
- Correct commit abbrev length (Kuniyuki)
- Reduce duplication (Kuniyuki)
- Add checks on sk_state (Martin)
- Split exporting inet[6]_lookup_reuseport into separate patch (Eric)

---
Daniel Borkmann (1):
      selftests/bpf: Test that SO_REUSEPORT can be used with sk_assign helper

Lorenz Bauer (6):
      udp: re-score reuseport groups when connected sockets are present
      net: export inet_lookup_reuseport and inet6_lookup_reuseport
      net: remove duplicate reuseport_lookup functions
      net: document inet[6]_lookup_reuseport sk_state requirements
      net: remove duplicate sk_lookup helpers
      bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign

 include/net/inet6_hashtables.h                     |  81 ++++++++-
 include/net/inet_hashtables.h                      |  74 +++++++-
 include/net/sock.h                                 |   7 +-
 include/uapi/linux/bpf.h                           |   3 -
 net/core/filter.c                                  |   2 -
 net/ipv4/inet_hashtables.c                         |  67 ++++---
 net/ipv4/udp.c                                     |  88 ++++-----
 net/ipv6/inet6_hashtables.c                        |  70 +++++---
 net/ipv6/udp.c                                     |  98 ++++------
 tools/include/uapi/linux/bpf.h                     |   3 -
 tools/testing/selftests/bpf/network_helpers.c      |   3 +
 .../selftests/bpf/prog_tests/assign_reuse.c        | 197 +++++++++++++++++++++
 .../selftests/bpf/progs/test_assign_reuse.c        | 142 +++++++++++++++
 13 files changed, 656 insertions(+), 179 deletions(-)
---
base-commit: 970308a7b544fa1c7ee98a2721faba3765be8dd8
change-id: 20230613-so-reuseport-e92c526173ee

Best regards,
-- 
Lorenz Bauer <lmb@isovalent.com>

[PATCH bpf-next v4 1/7] udp: re-score reuseport groups when connected sockets are present

[Lorenz Bauer]

Contrary to TCP, UDP reuseport groups can contain TCP_ESTABLISHED
sockets. To support these properly we remember whether a group has
a connected socket and skip the fast reuseport early-return. In
effect we continue scoring all reuseport sockets and then choose the
one with the highest score.

The current code fails to re-calculate the score for the result of
lookup_reuseport. According to Kuniyuki Iwashima:

    1) SO_INCOMING_CPU is set
       -> selected sk might have +1 score

    2) BPF prog returns ESTABLISHED and/or SO_INCOMING_CPU sk
       -> selected sk will have more than 8

  Using the old score could trigger more lookups depending on the
  order that sockets are created.

    sk -> sk (SO_INCOMING_CPU) -> sk (ESTABLISHED)
    |     |
    `-> select the next SO_INCOMING_CPU sk
          |
          `-> select itself (We should save this lookup)

Fixes: efc6b6f6c311 ("udp: Improve load balancing for SO_REUSEPORT.")
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
---
 net/ipv4/udp.c | 20 +++++++++++++++-----
 net/ipv6/udp.c | 19 ++++++++++++++-----
 2 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index fd3dae081f3a..5ef478d2c408 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -450,14 +450,24 @@ static struct sock *udp4_lib_lookup2(struct net *net,
 		score = compute_score(sk, net, saddr, sport,
 				      daddr, hnum, dif, sdif);
 		if (score > badness) {
-			result = lookup_reuseport(net, sk, skb,
-						  saddr, sport, daddr, hnum);
+			badness = score;
+			result = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
+			if (!result) {
+				result = sk;
+				continue;
+			}
+
 			/* Fall back to scoring if group has connections */
-			if (result && !reuseport_has_conns(sk))
+			if (!reuseport_has_conns(sk))
 				return result;
 
-			result = result ? : sk;
-			badness = score;
+			/* Reuseport logic returned an error, keep original score. */
+			if (IS_ERR(result))
+				continue;
+
+			badness = compute_score(result, net, saddr, sport,
+						daddr, hnum, dif, sdif);
+
 		}
 	}
 	return result;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index e5a337e6b970..8b3cb1d7da7c 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -193,14 +193,23 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 		score = compute_score(sk, net, saddr, sport,
 				      daddr, hnum, dif, sdif);
 		if (score > badness) {
-			result = lookup_reuseport(net, sk, skb,
-						  saddr, sport, daddr, hnum);
+			badness = score;
+			result = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
+			if (!result) {
+				result = sk;
+				continue;
+			}
+
 			/* Fall back to scoring if group has connections */
-			if (result && !reuseport_has_conns(sk))
+			if (!reuseport_has_conns(sk))
 				return result;
 
-			result = result ? : sk;
-			badness = score;
+			/* Reuseport logic returned an error, keep original score. */
+			if (IS_ERR(result))
+				continue;
+
+			badness = compute_score(sk, net, saddr, sport,
+						daddr, hnum, dif, sdif);
 		}
 	}
 	return result;

-- 
2.40.1

[PATCH bpf-next v4 2/7] net: export inet_lookup_reuseport and inet6_lookup_reuseport

[Lorenz Bauer]

Rename the existing reuseport helpers for IPv4 and IPv6 so that they
can be invoked in the follow up commit. Export them so that building
DCCP and IPv6 as a module works.

No change in functionality.

Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
---
 include/net/inet6_hashtables.h |  7 +++++++
 include/net/inet_hashtables.h  |  5 +++++
 net/ipv4/inet_hashtables.c     | 15 ++++++++-------
 net/ipv6/inet6_hashtables.c    | 19 ++++++++++---------
 4 files changed, 30 insertions(+), 16 deletions(-)

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index 56f1286583d3..032ddab48f8f 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -48,6 +48,13 @@ struct sock *__inet6_lookup_established(struct net *net,
 					const u16 hnum, const int dif,
 					const int sdif);
 
+struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
+				    struct sk_buff *skb, int doff,
+				    const struct in6_addr *saddr,
+				    __be16 sport,
+				    const struct in6_addr *daddr,
+				    unsigned short hnum);
+
 struct sock *inet6_lookup_listener(struct net *net,
 				   struct inet_hashinfo *hashinfo,
 				   struct sk_buff *skb, int doff,
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 99bd823e97f6..8734f3488f5d 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -379,6 +379,11 @@ struct sock *__inet_lookup_established(struct net *net,
 				       const __be32 daddr, const u16 hnum,
 				       const int dif, const int sdif);
 
+struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
+				   struct sk_buff *skb, int doff,
+				   __be32 saddr, __be16 sport,
+				   __be32 daddr, unsigned short hnum);
+
 static inline struct sock *
 	inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
 				const __be32 saddr, const __be16 sport,
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index e7391bf310a7..920131e4a65d 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -332,10 +332,10 @@ static inline int compute_score(struct sock *sk, struct net *net,
 	return score;
 }
 
-static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
-					    struct sk_buff *skb, int doff,
-					    __be32 saddr, __be16 sport,
-					    __be32 daddr, unsigned short hnum)
+struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
+				   struct sk_buff *skb, int doff,
+				   __be32 saddr, __be16 sport,
+				   __be32 daddr, unsigned short hnum)
 {
 	struct sock *reuse_sk = NULL;
 	u32 phash;
@@ -346,6 +346,7 @@ static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
 	}
 	return reuse_sk;
 }
+EXPORT_SYMBOL_GPL(inet_lookup_reuseport);
 
 /*
  * Here are some nice properties to exploit here. The BSD API
@@ -369,8 +370,8 @@ static struct sock *inet_lhash2_lookup(struct net *net,
 	sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
 		score = compute_score(sk, net, hnum, daddr, dif, sdif);
 		if (score > hiscore) {
-			result = lookup_reuseport(net, sk, skb, doff,
-						  saddr, sport, daddr, hnum);
+			result = inet_lookup_reuseport(net, sk, skb, doff,
+						       saddr, sport, daddr, hnum);
 			if (result)
 				return result;
 
@@ -399,7 +400,7 @@ static inline struct sock *inet_lookup_run_bpf(struct net *net,
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
-	reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
+	reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index b64b49012655..b7c56867314e 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -111,12 +111,12 @@ static inline int compute_score(struct sock *sk, struct net *net,
 	return score;
 }
 
-static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
-					    struct sk_buff *skb, int doff,
-					    const struct in6_addr *saddr,
-					    __be16 sport,
-					    const struct in6_addr *daddr,
-					    unsigned short hnum)
+struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
+				    struct sk_buff *skb, int doff,
+				    const struct in6_addr *saddr,
+				    __be16 sport,
+				    const struct in6_addr *daddr,
+				    unsigned short hnum)
 {
 	struct sock *reuse_sk = NULL;
 	u32 phash;
@@ -127,6 +127,7 @@ static inline struct sock *lookup_reuseport(struct net *net, struct sock *sk,
 	}
 	return reuse_sk;
 }
+EXPORT_SYMBOL_GPL(inet6_lookup_reuseport);
 
 /* called with rcu_read_lock() */
 static struct sock *inet6_lhash2_lookup(struct net *net,
@@ -143,8 +144,8 @@ static struct sock *inet6_lhash2_lookup(struct net *net,
 	sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
 		score = compute_score(sk, net, hnum, daddr, dif, sdif);
 		if (score > hiscore) {
-			result = lookup_reuseport(net, sk, skb, doff,
-						  saddr, sport, daddr, hnum);
+			result = inet6_lookup_reuseport(net, sk, skb, doff,
+							saddr, sport, daddr, hnum);
 			if (result)
 				return result;
 
@@ -175,7 +176,7 @@ static inline struct sock *inet6_lookup_run_bpf(struct net *net,
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
-	reuse_sk = lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
+	reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;

-- 
2.40.1

[PATCH bpf-next v4 3/7] net: remove duplicate reuseport_lookup functions

[Lorenz Bauer]

There are currently four copies of reuseport_lookup: one each for
(TCP, UDP)x(IPv4, IPv6). This forces us to duplicate all callers of
those functions as well. This is already the case for sk_lookup
helpers (inet,inet6,udp4,udp6)_lookup_run_bpf.

There are two differences between the reuseport_lookup helpers:

1. They call different hash functions depending on protocol
2. UDP reuseport_lookup checks that sk_state != TCP_ESTABLISHED

Move the check for sk_state into the caller and use the INDIRECT_CALL
infrastructure to cut down the helpers to one per IP version.

Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
---
 include/net/inet6_hashtables.h | 11 ++++++++++-
 include/net/inet_hashtables.h  | 15 ++++++++++-----
 net/ipv4/inet_hashtables.c     | 20 +++++++++++++-------
 net/ipv4/udp.c                 | 34 +++++++++++++---------------------
 net/ipv6/inet6_hashtables.c    | 14 ++++++++++----
 net/ipv6/udp.c                 | 41 ++++++++++++++++-------------------------
 6 files changed, 72 insertions(+), 63 deletions(-)

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index 032ddab48f8f..f89320b6fee3 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -48,12 +48,21 @@ struct sock *__inet6_lookup_established(struct net *net,
 					const u16 hnum, const int dif,
 					const int sdif);
 
+typedef u32 (inet6_ehashfn_t)(const struct net *net,
+			       const struct in6_addr *laddr, const u16 lport,
+			       const struct in6_addr *faddr, const __be16 fport);
+
+inet6_ehashfn_t inet6_ehashfn;
+
+INDIRECT_CALLABLE_DECLARE(inet6_ehashfn_t udp6_ehashfn);
+
 struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
 				    struct sk_buff *skb, int doff,
 				    const struct in6_addr *saddr,
 				    __be16 sport,
 				    const struct in6_addr *daddr,
-				    unsigned short hnum);
+				    unsigned short hnum,
+				    inet6_ehashfn_t *ehashfn);
 
 struct sock *inet6_lookup_listener(struct net *net,
 				   struct inet_hashinfo *hashinfo,
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 8734f3488f5d..ddfa2e67fdb5 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -379,10 +379,19 @@ struct sock *__inet_lookup_established(struct net *net,
 				       const __be32 daddr, const u16 hnum,
 				       const int dif, const int sdif);
 
+typedef u32 (inet_ehashfn_t)(const struct net *net,
+			      const __be32 laddr, const __u16 lport,
+			      const __be32 faddr, const __be16 fport);
+
+inet_ehashfn_t inet_ehashfn;
+
+INDIRECT_CALLABLE_DECLARE(inet_ehashfn_t udp_ehashfn);
+
 struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
 				   struct sk_buff *skb, int doff,
 				   __be32 saddr, __be16 sport,
-				   __be32 daddr, unsigned short hnum);
+				   __be32 daddr, unsigned short hnum,
+				   inet_ehashfn_t *ehashfn);
 
 static inline struct sock *
 	inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
@@ -453,10 +462,6 @@ static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
 			     refcounted);
 }
 
-u32 inet6_ehashfn(const struct net *net,
-		  const struct in6_addr *laddr, const u16 lport,
-		  const struct in6_addr *faddr, const __be16 fport);
-
 static inline void sk_daddr_set(struct sock *sk, __be32 addr)
 {
 	sk->sk_daddr = addr; /* alias of inet_daddr */
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 920131e4a65d..352eb371c93b 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -28,9 +28,9 @@
 #include <net/tcp.h>
 #include <net/sock_reuseport.h>
 
-static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
-			const __u16 lport, const __be32 faddr,
-			const __be16 fport)
+u32 inet_ehashfn(const struct net *net, const __be32 laddr,
+		 const __u16 lport, const __be32 faddr,
+		 const __be16 fport)
 {
 	static u32 inet_ehash_secret __read_mostly;
 
@@ -39,6 +39,7 @@ static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
 	return __inet_ehashfn(laddr, lport, faddr, fport,
 			      inet_ehash_secret + net_hash_mix(net));
 }
+EXPORT_SYMBOL_GPL(inet_ehashfn);
 
 /* This function handles inet_sock, but also timewait and request sockets
  * for IPv4/IPv6.
@@ -332,16 +333,20 @@ static inline int compute_score(struct sock *sk, struct net *net,
 	return score;
 }
 
+INDIRECT_CALLABLE_DECLARE(inet_ehashfn_t udp_ehashfn);
+
 struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
 				   struct sk_buff *skb, int doff,
 				   __be32 saddr, __be16 sport,
-				   __be32 daddr, unsigned short hnum)
+				   __be32 daddr, unsigned short hnum,
+				   inet_ehashfn_t *ehashfn)
 {
 	struct sock *reuse_sk = NULL;
 	u32 phash;
 
 	if (sk->sk_reuseport) {
-		phash = inet_ehashfn(net, daddr, hnum, saddr, sport);
+		phash = INDIRECT_CALL_2(ehashfn, udp_ehashfn, inet_ehashfn,
+					net, daddr, hnum, saddr, sport);
 		reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
 	}
 	return reuse_sk;
@@ -371,7 +376,7 @@ static struct sock *inet_lhash2_lookup(struct net *net,
 		score = compute_score(sk, net, hnum, daddr, dif, sdif);
 		if (score > hiscore) {
 			result = inet_lookup_reuseport(net, sk, skb, doff,
-						       saddr, sport, daddr, hnum);
+						       saddr, sport, daddr, hnum, inet_ehashfn);
 			if (result)
 				return result;
 
@@ -400,7 +405,8 @@ static inline struct sock *inet_lookup_run_bpf(struct net *net,
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
-	reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
+	reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum,
+					 inet_ehashfn);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 5ef478d2c408..7258edece691 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -405,9 +405,9 @@ static int compute_score(struct sock *sk, struct net *net,
 	return score;
 }
 
-static u32 udp_ehashfn(const struct net *net, const __be32 laddr,
-		       const __u16 lport, const __be32 faddr,
-		       const __be16 fport)
+INDIRECT_CALLABLE_SCOPE
+u32 udp_ehashfn(const struct net *net, const __be32 laddr, const __u16 lport,
+		const __be32 faddr, const __be16 fport)
 {
 	static u32 udp_ehash_secret __read_mostly;
 
@@ -417,22 +417,6 @@ static u32 udp_ehashfn(const struct net *net, const __be32 laddr,
 			      udp_ehash_secret + net_hash_mix(net));
 }
 
-static struct sock *lookup_reuseport(struct net *net, struct sock *sk,
-				     struct sk_buff *skb,
-				     __be32 saddr, __be16 sport,
-				     __be32 daddr, unsigned short hnum)
-{
-	struct sock *reuse_sk = NULL;
-	u32 hash;
-
-	if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) {
-		hash = udp_ehashfn(net, daddr, hnum, saddr, sport);
-		reuse_sk = reuseport_select_sock(sk, hash, skb,
-						 sizeof(struct udphdr));
-	}
-	return reuse_sk;
-}
-
 /* called with rcu_read_lock() */
 static struct sock *udp4_lib_lookup2(struct net *net,
 				     __be32 saddr, __be16 sport,
@@ -451,7 +435,14 @@ static struct sock *udp4_lib_lookup2(struct net *net,
 				      daddr, hnum, dif, sdif);
 		if (score > badness) {
 			badness = score;
-			result = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
+
+			if (sk->sk_state == TCP_ESTABLISHED) {
+				result = sk;
+				continue;
+			}
+
+			result = inet_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
+						       saddr, sport, daddr, hnum, udp_ehashfn);
 			if (!result) {
 				result = sk;
 				continue;
@@ -490,7 +481,8 @@ static struct sock *udp4_lookup_run_bpf(struct net *net,
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
-	reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
+	reuse_sk = inet_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
+					 saddr, sport, daddr, hnum, udp_ehashfn);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index b7c56867314e..3616225c89ef 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -39,6 +39,7 @@ u32 inet6_ehashfn(const struct net *net,
 	return __inet6_ehashfn(lhash, lport, fhash, fport,
 			       inet6_ehash_secret + net_hash_mix(net));
 }
+EXPORT_SYMBOL_GPL(inet6_ehashfn);
 
 /*
  * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
@@ -111,18 +112,22 @@ static inline int compute_score(struct sock *sk, struct net *net,
 	return score;
 }
 
+INDIRECT_CALLABLE_DECLARE(inet6_ehashfn_t udp6_ehashfn);
+
 struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
 				    struct sk_buff *skb, int doff,
 				    const struct in6_addr *saddr,
 				    __be16 sport,
 				    const struct in6_addr *daddr,
-				    unsigned short hnum)
+				    unsigned short hnum,
+				    inet6_ehashfn_t *ehashfn)
 {
 	struct sock *reuse_sk = NULL;
 	u32 phash;
 
 	if (sk->sk_reuseport) {
-		phash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
+		phash = INDIRECT_CALL_INET(ehashfn, udp6_ehashfn, inet6_ehashfn,
+					   net, daddr, hnum, saddr, sport);
 		reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
 	}
 	return reuse_sk;
@@ -145,7 +150,7 @@ static struct sock *inet6_lhash2_lookup(struct net *net,
 		score = compute_score(sk, net, hnum, daddr, dif, sdif);
 		if (score > hiscore) {
 			result = inet6_lookup_reuseport(net, sk, skb, doff,
-							saddr, sport, daddr, hnum);
+							saddr, sport, daddr, hnum, inet6_ehashfn);
 			if (result)
 				return result;
 
@@ -176,7 +181,8 @@ static inline struct sock *inet6_lookup_run_bpf(struct net *net,
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
-	reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum);
+	reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
+					  saddr, sport, daddr, hnum, inet6_ehashfn);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8b3cb1d7da7c..ebac9200b15c 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -70,11 +70,12 @@ int udpv6_init_sock(struct sock *sk)
 	return 0;
 }
 
-static u32 udp6_ehashfn(const struct net *net,
-			const struct in6_addr *laddr,
-			const u16 lport,
-			const struct in6_addr *faddr,
-			const __be16 fport)
+INDIRECT_CALLABLE_SCOPE
+u32 udp6_ehashfn(const struct net *net,
+		 const struct in6_addr *laddr,
+		 const u16 lport,
+		 const struct in6_addr *faddr,
+		 const __be16 fport)
 {
 	static u32 udp6_ehash_secret __read_mostly;
 	static u32 udp_ipv6_hash_secret __read_mostly;
@@ -159,24 +160,6 @@ static int compute_score(struct sock *sk, struct net *net,
 	return score;
 }
 
-static struct sock *lookup_reuseport(struct net *net, struct sock *sk,
-				     struct sk_buff *skb,
-				     const struct in6_addr *saddr,
-				     __be16 sport,
-				     const struct in6_addr *daddr,
-				     unsigned int hnum)
-{
-	struct sock *reuse_sk = NULL;
-	u32 hash;
-
-	if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) {
-		hash = udp6_ehashfn(net, daddr, hnum, saddr, sport);
-		reuse_sk = reuseport_select_sock(sk, hash, skb,
-						 sizeof(struct udphdr));
-	}
-	return reuse_sk;
-}
-
 /* called with rcu_read_lock() */
 static struct sock *udp6_lib_lookup2(struct net *net,
 		const struct in6_addr *saddr, __be16 sport,
@@ -194,7 +177,14 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 				      daddr, hnum, dif, sdif);
 		if (score > badness) {
 			badness = score;
-			result = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
+
+			if (sk->sk_state == TCP_ESTABLISHED) {
+				result = sk;
+				continue;
+			}
+
+			result = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
+							saddr, sport, daddr, hnum, udp6_ehashfn);
 			if (!result) {
 				result = sk;
 				continue;
@@ -234,7 +224,8 @@ static inline struct sock *udp6_lookup_run_bpf(struct net *net,
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
-	reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
+	reuse_sk = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
+					  saddr, sport, daddr, hnum, udp6_ehashfn);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;

-- 
2.40.1

Re: [PATCH bpf-next v4 3/7] net: remove duplicate reuseport_lookup functions

[Lorenz Bauer]

On Wed, Jun 28, 2023 at 7:33 PM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:

> > +
> > +inet6_ehashfn_t inet6_ehashfn;
> > +
> > +INDIRECT_CALLABLE_DECLARE(inet6_ehashfn_t udp6_ehashfn);
>
> We need not define udp6_ehashfn() here as inet6_hashtables.c has
> the definition.
>
> Only inet6_ehashfn() is needed because sk_ehashfn() uses it.

Without udp6_ehashfn we get the following error, as reported by Simon
against v1:

net/ipv4/udp.c:410:5: error: no previous prototype for ‘udp_ehashfn’
[-Werror=missing-prototypes]
  410 | u32 udp_ehashfn(const struct net *net, const __be32 laddr,
const __u16 lport,
      |     ^~~~~~~~~~~

> > +inet_ehashfn_t inet_ehashfn;
> > +
> > +INDIRECT_CALLABLE_DECLARE(inet_ehashfn_t udp_ehashfn);
> > +
>
> We don't need inet_ehashfn() and udp_ehashfn() declarations here.

Without inet_ehashfn I get:

./include/net/inet_hashtables.h: In function ‘__inet_lookup_skb’:
./include/net/inet_hashtables.h:501:42: error: ‘inet_ehashfn’
undeclared (first use in this function); did you mean ‘inet_bhashfn’?
  501 |                              refcounted, inet_ehashfn);

Same problem with the warning as above.

I think this needs to stay the way it is.

[PATCH bpf-next v4 4/7] net: document inet[6]_lookup_reuseport sk_state requirements

[Lorenz Bauer]

The current implementation was extracted from inet[6]_lhash2_lookup
in commit 80b373f74f9e ("inet: Extract helper for selecting socket
from reuseport group") and commit 5df6531292b5 ("inet6: Extract helper
for selecting socket from reuseport group"). In the original context,
sk is always in TCP_LISTEN state and so did not have a separate check.

Add documentation that specifies which sk_state are valid to pass to
the function.

Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
---
 net/ipv4/inet_hashtables.c  | 14 ++++++++++++++
 net/ipv6/inet6_hashtables.c | 14 ++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 352eb371c93b..ac927a635a6f 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -335,6 +335,20 @@ static inline int compute_score(struct sock *sk, struct net *net,
 
 INDIRECT_CALLABLE_DECLARE(inet_ehashfn_t udp_ehashfn);
 
+/**
+ * inet_lookup_reuseport() - execute reuseport logic on AF_INET socket if necessary.
+ * @net: network namespace.
+ * @sk: AF_INET socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP.
+ * @skb: context for a potential SK_REUSEPORT program.
+ * @doff: header offset.
+ * @saddr: source address.
+ * @sport: source port.
+ * @daddr: destination address.
+ * @hnum: destination port in host byte order.
+ *
+ * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to
+ *         the selected sock or an error.
+ */
 struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
 				   struct sk_buff *skb, int doff,
 				   __be32 saddr, __be16 sport,
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 3616225c89ef..d37602fabc00 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -114,6 +114,20 @@ static inline int compute_score(struct sock *sk, struct net *net,
 
 INDIRECT_CALLABLE_DECLARE(inet6_ehashfn_t udp6_ehashfn);
 
+/**
+ * inet6_lookup_reuseport() - execute reuseport logic on AF_INET6 socket if necessary.
+ * @net: network namespace.
+ * @sk: AF_INET6 socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP.
+ * @skb: context for a potential SK_REUSEPORT program.
+ * @doff: header offset.
+ * @saddr: source address.
+ * @sport: source port.
+ * @daddr: destination address.
+ * @hnum: destination port in host byte order.
+ *
+ * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to
+ *         the selected sock or an error.
+ */
 struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
 				    struct sk_buff *skb, int doff,
 				    const struct in6_addr *saddr,

-- 
2.40.1

[PATCH bpf-next v4 5/7] net: remove duplicate sk_lookup helpers

[Lorenz Bauer]

Now that inet[6]_lookup_reuseport are parameterised on the ehashfn
we can remove two sk_lookup helpers.

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
---
 include/net/inet6_hashtables.h |  9 +++++++++
 include/net/inet_hashtables.h  |  7 +++++++
 net/ipv4/inet_hashtables.c     | 26 +++++++++++++-------------
 net/ipv4/udp.c                 | 32 +++++---------------------------
 net/ipv6/inet6_hashtables.c    | 31 ++++++++++++++++---------------
 net/ipv6/udp.c                 | 34 +++++-----------------------------
 6 files changed, 55 insertions(+), 84 deletions(-)

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index f89320b6fee3..a6722d6ef80f 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -73,6 +73,15 @@ struct sock *inet6_lookup_listener(struct net *net,
 				   const unsigned short hnum,
 				   const int dif, const int sdif);
 
+struct sock *inet6_lookup_run_sk_lookup(struct net *net,
+					int protocol,
+					struct sk_buff *skb, int doff,
+					const struct in6_addr *saddr,
+					const __be16 sport,
+					const struct in6_addr *daddr,
+					const u16 hnum, const int dif,
+					inet6_ehashfn_t *ehashfn);
+
 static inline struct sock *__inet6_lookup(struct net *net,
 					  struct inet_hashinfo *hashinfo,
 					  struct sk_buff *skb, int doff,
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index ddfa2e67fdb5..c0532cc7587f 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -393,6 +393,13 @@ struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk,
 				   __be32 daddr, unsigned short hnum,
 				   inet_ehashfn_t *ehashfn);
 
+struct sock *inet_lookup_run_sk_lookup(struct net *net,
+				       int protocol,
+				       struct sk_buff *skb, int doff,
+				       __be32 saddr, __be16 sport,
+				       __be32 daddr, u16 hnum, const int dif,
+				       inet_ehashfn_t *ehashfn);
+
 static inline struct sock *
 	inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
 				const __be32 saddr, const __be16 sport,
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index ac927a635a6f..a411ae560bdf 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -402,25 +402,23 @@ static struct sock *inet_lhash2_lookup(struct net *net,
 	return result;
 }
 
-static inline struct sock *inet_lookup_run_bpf(struct net *net,
-					       struct inet_hashinfo *hashinfo,
-					       struct sk_buff *skb, int doff,
-					       __be32 saddr, __be16 sport,
-					       __be32 daddr, u16 hnum, const int dif)
+struct sock *inet_lookup_run_sk_lookup(struct net *net,
+				       int protocol,
+				       struct sk_buff *skb, int doff,
+				       __be32 saddr, __be16 sport,
+				       __be32 daddr, u16 hnum, const int dif,
+				       inet_ehashfn_t *ehashfn)
 {
 	struct sock *sk, *reuse_sk;
 	bool no_reuseport;
 
-	if (hashinfo != net->ipv4.tcp_death_row.hashinfo)
-		return NULL; /* only TCP is supported */
-
-	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP, saddr, sport,
+	no_reuseport = bpf_sk_lookup_run_v4(net, protocol, saddr, sport,
 					    daddr, hnum, dif, &sk);
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
 	reuse_sk = inet_lookup_reuseport(net, sk, skb, doff, saddr, sport, daddr, hnum,
-					 inet_ehashfn);
+					 ehashfn);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;
@@ -438,9 +436,11 @@ struct sock *__inet_lookup_listener(struct net *net,
 	unsigned int hash2;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
-		result = inet_lookup_run_bpf(net, hashinfo, skb, doff,
-					     saddr, sport, daddr, hnum, dif);
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+	    hashinfo == net->ipv4.tcp_death_row.hashinfo) {
+		result = inet_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
+						   saddr, sport, daddr, hnum, dif,
+						   inet_ehashfn);
 		if (result)
 			goto done;
 	}
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 7258edece691..eb79268f216d 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -464,30 +464,6 @@ static struct sock *udp4_lib_lookup2(struct net *net,
 	return result;
 }
 
-static struct sock *udp4_lookup_run_bpf(struct net *net,
-					struct udp_table *udptable,
-					struct sk_buff *skb,
-					__be32 saddr, __be16 sport,
-					__be32 daddr, u16 hnum, const int dif)
-{
-	struct sock *sk, *reuse_sk;
-	bool no_reuseport;
-
-	if (udptable != net->ipv4.udp_table)
-		return NULL; /* only UDP is supported */
-
-	no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_UDP, saddr, sport,
-					    daddr, hnum, dif, &sk);
-	if (no_reuseport || IS_ERR_OR_NULL(sk))
-		return sk;
-
-	reuse_sk = inet_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
-					 saddr, sport, daddr, hnum, udp_ehashfn);
-	if (reuse_sk)
-		sk = reuse_sk;
-	return sk;
-}
-
 /* UDP is nearly always wildcards out the wazoo, it makes no sense to try
  * harder than this. -DaveM
  */
@@ -512,9 +488,11 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
 		goto done;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
-		sk = udp4_lookup_run_bpf(net, udptable, skb,
-					 saddr, sport, daddr, hnum, dif);
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+	    udptable == net->ipv4.udp_table) {
+		sk = inet_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr),
+					       saddr, sport, daddr, hnum, dif,
+					       udp_ehashfn);
 		if (sk) {
 			result = sk;
 			goto done;
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index d37602fabc00..f9653675f577 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -176,31 +176,30 @@ static struct sock *inet6_lhash2_lookup(struct net *net,
 	return result;
 }
 
-static inline struct sock *inet6_lookup_run_bpf(struct net *net,
-						struct inet_hashinfo *hashinfo,
-						struct sk_buff *skb, int doff,
-						const struct in6_addr *saddr,
-						const __be16 sport,
-						const struct in6_addr *daddr,
-						const u16 hnum, const int dif)
+struct sock *inet6_lookup_run_sk_lookup(struct net *net,
+					int protocol,
+					struct sk_buff *skb, int doff,
+					const struct in6_addr *saddr,
+					const __be16 sport,
+					const struct in6_addr *daddr,
+					const u16 hnum, const int dif,
+					inet6_ehashfn_t *ehashfn)
 {
 	struct sock *sk, *reuse_sk;
 	bool no_reuseport;
 
-	if (hashinfo != net->ipv4.tcp_death_row.hashinfo)
-		return NULL; /* only TCP is supported */
-
-	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_TCP, saddr, sport,
+	no_reuseport = bpf_sk_lookup_run_v6(net, protocol, saddr, sport,
 					    daddr, hnum, dif, &sk);
 	if (no_reuseport || IS_ERR_OR_NULL(sk))
 		return sk;
 
 	reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
-					  saddr, sport, daddr, hnum, inet6_ehashfn);
+					  saddr, sport, daddr, hnum, ehashfn);
 	if (reuse_sk)
 		sk = reuse_sk;
 	return sk;
 }
+EXPORT_SYMBOL_GPL(inet6_lookup_run_sk_lookup);
 
 struct sock *inet6_lookup_listener(struct net *net,
 		struct inet_hashinfo *hashinfo,
@@ -214,9 +213,11 @@ struct sock *inet6_lookup_listener(struct net *net,
 	unsigned int hash2;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
-		result = inet6_lookup_run_bpf(net, hashinfo, skb, doff,
-					      saddr, sport, daddr, hnum, dif);
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+	    hashinfo == net->ipv4.tcp_death_row.hashinfo) {
+		result = inet6_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
+						    saddr, sport, daddr, hnum, dif,
+						    inet6_ehashfn);
 		if (result)
 			goto done;
 	}
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ebac9200b15c..8a6d94cabee0 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -205,32 +205,6 @@ static struct sock *udp6_lib_lookup2(struct net *net,
 	return result;
 }
 
-static inline struct sock *udp6_lookup_run_bpf(struct net *net,
-					       struct udp_table *udptable,
-					       struct sk_buff *skb,
-					       const struct in6_addr *saddr,
-					       __be16 sport,
-					       const struct in6_addr *daddr,
-					       u16 hnum, const int dif)
-{
-	struct sock *sk, *reuse_sk;
-	bool no_reuseport;
-
-	if (udptable != net->ipv4.udp_table)
-		return NULL; /* only UDP is supported */
-
-	no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport,
-					    daddr, hnum, dif, &sk);
-	if (no_reuseport || IS_ERR_OR_NULL(sk))
-		return sk;
-
-	reuse_sk = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr),
-					  saddr, sport, daddr, hnum, udp6_ehashfn);
-	if (reuse_sk)
-		sk = reuse_sk;
-	return sk;
-}
-
 /* rcu_read_lock() must be held */
 struct sock *__udp6_lib_lookup(struct net *net,
 			       const struct in6_addr *saddr, __be16 sport,
@@ -255,9 +229,11 @@ struct sock *__udp6_lib_lookup(struct net *net,
 		goto done;
 
 	/* Lookup redirect from BPF */
-	if (static_branch_unlikely(&bpf_sk_lookup_enabled)) {
-		sk = udp6_lookup_run_bpf(net, udptable, skb,
-					 saddr, sport, daddr, hnum, dif);
+	if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
+	    udptable == net->ipv4.udp_table) {
+		sk = inet6_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr),
+						saddr, sport, daddr, hnum, dif,
+						udp6_ehashfn);
 		if (sk) {
 			result = sk;
 			goto done;

-- 
2.40.1

[PATCH bpf-next v4 6/7] bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign

[Lorenz Bauer]

Currently the bpf_sk_assign helper in tc BPF context refuses SO_REUSEPORT
sockets. This means we can't use the helper to steer traffic to Envoy,
which configures SO_REUSEPORT on its sockets. In turn, we're blocked
from removing TPROXY from our setup.

The reason that bpf_sk_assign refuses such sockets is that the
bpf_sk_lookup helpers don't execute SK_REUSEPORT programs. Instead,
one of the reuseport sockets is selected by hash. This could cause
dispatch to the "wrong" socket:

    sk = bpf_sk_lookup_tcp(...) // select SO_REUSEPORT by hash
    bpf_sk_assign(skb, sk) // SK_REUSEPORT wasn't executed

Fixing this isn't as simple as invoking SK_REUSEPORT from the lookup
helpers unfortunately. In the tc context, L2 headers are at the start
of the skb, while SK_REUSEPORT expects L3 headers instead.

Instead, we execute the SK_REUSEPORT program when the assigned socket
is pulled out of the skb, further up the stack. This creates some
trickiness with regards to refcounting as bpf_sk_assign will put both
refcounted and RCU freed sockets in skb->sk. reuseport sockets are RCU
freed. We can infer that the sk_assigned socket is RCU freed if the
reuseport lookup succeeds, but convincing yourself of this fact isn't
straight forward. Therefore we defensively check refcounting on the
sk_assign sock even though it's probably not required in practice.

Fixes: 8e368dc72e86 ("bpf: Fix use of sk->sk_reuseport from sk_assign")
Fixes: cf7fbe660f2d ("bpf: Add socket assign support")
Co-developed-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
Cc: Joe Stringer <joe@cilium.io>
Link: https://lore.kernel.org/bpf/CACAyw98+qycmpQzKupquhkxbvWK4OFyDuuLMBNROnfWMZxUWeA@mail.gmail.com/
---
 include/net/inet6_hashtables.h | 56 ++++++++++++++++++++++++++++++++++++++----
 include/net/inet_hashtables.h  | 49 ++++++++++++++++++++++++++++++++++--
 include/net/sock.h             |  7 ++++--
 include/uapi/linux/bpf.h       |  3 ---
 net/core/filter.c              |  2 --
 net/ipv4/udp.c                 |  8 ++++--
 net/ipv6/udp.c                 | 10 +++++---
 tools/include/uapi/linux/bpf.h |  3 ---
 8 files changed, 116 insertions(+), 22 deletions(-)

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index a6722d6ef80f..7d677b89f269 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -103,6 +103,46 @@ static inline struct sock *__inet6_lookup(struct net *net,
 				     daddr, hnum, dif, sdif);
 }
 
+static inline
+struct sock *inet6_steal_sock(struct net *net, struct sk_buff *skb, int doff,
+			      const struct in6_addr *saddr, const __be16 sport,
+			      const struct in6_addr *daddr, const __be16 dport,
+			      bool *refcounted, inet6_ehashfn_t *ehashfn)
+{
+	struct sock *sk, *reuse_sk;
+	bool prefetched;
+
+	sk = skb_steal_sock(skb, refcounted, &prefetched);
+	if (!sk)
+		return NULL;
+
+	if (!prefetched)
+		return sk;
+
+	if (sk->sk_protocol == IPPROTO_TCP) {
+		if (sk->sk_state != TCP_LISTEN)
+			return sk;
+	} else if (sk->sk_protocol == IPPROTO_UDP) {
+		if (sk->sk_state != TCP_CLOSE)
+			return sk;
+	} else {
+		return sk;
+	}
+
+	reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
+					  saddr, sport, daddr, ntohs(dport),
+					  ehashfn);
+	if (!reuse_sk || reuse_sk == sk)
+		return sk;
+
+	/* We've chosen a new reuseport sock which is never refcounted. This
+	 * implies that sk also isn't refcounted.
+	 */
+	WARN_ON_ONCE(*refcounted);
+
+	return reuse_sk;
+}
+
 static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
 					      struct sk_buff *skb, int doff,
 					      const __be16 sport,
@@ -110,14 +150,20 @@ static inline struct sock *__inet6_lookup_skb(struct inet_hashinfo *hashinfo,
 					      int iif, int sdif,
 					      bool *refcounted)
 {
-	struct sock *sk = skb_steal_sock(skb, refcounted);
-
+	struct net *net = dev_net(skb_dst(skb)->dev);
+	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+	struct sock *sk;
+
+	sk = inet6_steal_sock(net, skb, doff, &ip6h->saddr, sport, &ip6h->daddr, dport,
+			      refcounted, inet6_ehashfn);
+	if (IS_ERR(sk))
+		return NULL;
 	if (sk)
 		return sk;
 
-	return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
-			      doff, &ipv6_hdr(skb)->saddr, sport,
-			      &ipv6_hdr(skb)->daddr, ntohs(dport),
+	return __inet6_lookup(net, hashinfo, skb,
+			      doff, &ip6h->saddr, sport,
+			      &ip6h->daddr, ntohs(dport),
 			      iif, sdif, refcounted);
 }
 
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index c0532cc7587f..c6ae0af12ce0 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -449,6 +449,46 @@ static inline struct sock *inet_lookup(struct net *net,
 	return sk;
 }
 
+static inline
+struct sock *inet_steal_sock(struct net *net, struct sk_buff *skb, int doff,
+			     const __be32 saddr, const __be16 sport,
+			     const __be32 daddr, const __be16 dport,
+			     bool *refcounted, inet_ehashfn_t *ehashfn)
+{
+	struct sock *sk, *reuse_sk;
+	bool prefetched;
+
+	sk = skb_steal_sock(skb, refcounted, &prefetched);
+	if (!sk)
+		return NULL;
+
+	if (!prefetched)
+		return sk;
+
+	if (sk->sk_protocol == IPPROTO_TCP) {
+		if (sk->sk_state != TCP_LISTEN)
+			return sk;
+	} else if (sk->sk_protocol == IPPROTO_UDP) {
+		if (sk->sk_state != TCP_CLOSE)
+			return sk;
+	} else {
+		return sk;
+	}
+
+	reuse_sk = inet_lookup_reuseport(net, sk, skb, doff,
+					 saddr, sport, daddr, ntohs(dport),
+					 ehashfn);
+	if (!reuse_sk || reuse_sk == sk)
+		return sk;
+
+	/* We've chosen a new reuseport sock which is never refcounted. This
+	 * implies that sk also isn't refcounted.
+	 */
+	WARN_ON_ONCE(*refcounted);
+
+	return reuse_sk;
+}
+
 static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
 					     struct sk_buff *skb,
 					     int doff,
@@ -457,13 +497,18 @@ static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
 					     const int sdif,
 					     bool *refcounted)
 {
-	struct sock *sk = skb_steal_sock(skb, refcounted);
+	struct net *net = dev_net(skb_dst(skb)->dev);
 	const struct iphdr *iph = ip_hdr(skb);
+	struct sock *sk;
 
+	sk = inet_steal_sock(net, skb, doff, iph->saddr, sport, iph->daddr, dport,
+			     refcounted, inet_ehashfn);
+	if (IS_ERR(sk))
+		return NULL;
 	if (sk)
 		return sk;
 
-	return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
+	return __inet_lookup(net, hashinfo, skb,
 			     doff, iph->saddr, sport,
 			     iph->daddr, dport, inet_iif(skb), sdif,
 			     refcounted);
diff --git a/include/net/sock.h b/include/net/sock.h
index 656ea89f60ff..5645570c2a64 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2806,20 +2806,23 @@ sk_is_refcounted(struct sock *sk)
  * skb_steal_sock - steal a socket from an sk_buff
  * @skb: sk_buff to steal the socket from
  * @refcounted: is set to true if the socket is reference-counted
+ * @prefetched: is set to true if the socket was assigned from bpf
  */
 static inline struct sock *
-skb_steal_sock(struct sk_buff *skb, bool *refcounted)
+skb_steal_sock(struct sk_buff *skb, bool *refcounted, bool *prefetched)
 {
 	if (skb->sk) {
 		struct sock *sk = skb->sk;
 
 		*refcounted = true;
-		if (skb_sk_is_prefetched(skb))
+		*prefetched = skb_sk_is_prefetched(skb);
+		if (*prefetched)
 			*refcounted = sk_is_refcounted(sk);
 		skb->destructor = NULL;
 		skb->sk = NULL;
 		return sk;
 	}
+	*prefetched = false;
 	*refcounted = false;
 	return NULL;
 }
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index a7b5e91dd768..d6fb6f43b0f3 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -4158,9 +4158,6 @@ union bpf_attr {
  *		**-EOPNOTSUPP** if the operation is not supported, for example
  *		a call from outside of TC ingress.
  *
- *		**-ESOCKTNOSUPPORT** if the socket type is not supported
- *		(reuseport).
- *
  * long bpf_sk_assign(struct bpf_sk_lookup *ctx, struct bpf_sock *sk, u64 flags)
  *	Description
  *		Helper is overloaded depending on BPF program type. This
diff --git a/net/core/filter.c b/net/core/filter.c
index 428df050d021..d4be0a1d754c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -7278,8 +7278,6 @@ BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
 		return -EOPNOTSUPP;
 	if (unlikely(dev_net(skb->dev) != sock_net(sk)))
 		return -ENETUNREACH;
-	if (unlikely(sk_fullsock(sk) && sk->sk_reuseport))
-		return -ESOCKTNOSUPPORT;
 	if (sk_is_refcounted(sk) &&
 	    unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
 		return -ENOENT;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index eb79268f216d..b256f1f73b4d 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2388,7 +2388,11 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
 	if (udp4_csum_init(skb, uh, proto))
 		goto csum_error;
 
-	sk = skb_steal_sock(skb, &refcounted);
+	sk = inet_steal_sock(net, skb, sizeof(struct udphdr), saddr, uh->source, daddr, uh->dest,
+			     &refcounted, udp_ehashfn);
+	if (IS_ERR(sk))
+		goto no_sk;
+
 	if (sk) {
 		struct dst_entry *dst = skb_dst(skb);
 		int ret;
@@ -2409,7 +2413,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
 	sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
 	if (sk)
 		return udp_unicast_rcv_skb(sk, skb, uh);
-
+no_sk:
 	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
 		goto drop;
 	nf_reset_ct(skb);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8a6d94cabee0..2d4c05bc322a 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -923,9 +923,9 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
 	enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED;
 	const struct in6_addr *saddr, *daddr;
 	struct net *net = dev_net(skb->dev);
+	bool refcounted;
 	struct udphdr *uh;
 	struct sock *sk;
-	bool refcounted;
 	u32 ulen = 0;
 
 	if (!pskb_may_pull(skb, sizeof(struct udphdr)))
@@ -962,7 +962,11 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
 		goto csum_error;
 
 	/* Check if the socket is already available, e.g. due to early demux */
-	sk = skb_steal_sock(skb, &refcounted);
+	sk = inet6_steal_sock(net, skb, sizeof(struct udphdr), saddr, uh->source, daddr, uh->dest,
+			      &refcounted, udp6_ehashfn);
+	if (IS_ERR(sk))
+		goto no_sk;
+
 	if (sk) {
 		struct dst_entry *dst = skb_dst(skb);
 		int ret;
@@ -996,7 +1000,7 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
 			goto report_csum_error;
 		return udp6_unicast_rcv_skb(sk, skb, uh);
 	}
-
+no_sk:
 	reason = SKB_DROP_REASON_NO_SOCKET;
 
 	if (!uh->check)
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index a7b5e91dd768..d6fb6f43b0f3 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -4158,9 +4158,6 @@ union bpf_attr {
  *		**-EOPNOTSUPP** if the operation is not supported, for example
  *		a call from outside of TC ingress.
  *
- *		**-ESOCKTNOSUPPORT** if the socket type is not supported
- *		(reuseport).
- *
  * long bpf_sk_assign(struct bpf_sk_lookup *ctx, struct bpf_sock *sk, u64 flags)
  *	Description
  *		Helper is overloaded depending on BPF program type. This

-- 
2.40.1

Re: [PATCH bpf-next v4 6/7] bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign

[Lorenz Bauer]

On Wed, Jun 28, 2023 at 7:50 PM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:

> > +     } else {
> > +             return sk;
> > +     }
> > +
> > +     reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
> > +                                       saddr, sport, daddr, ntohs(dport),
> > +                                       ehashfn);
> > +     if (!reuse_sk || reuse_sk == sk)
>
> nit: compiler might have optimised though, given here is the fast path,
> we can save reuse_sk == sk check.

Ack.

Re: [PATCH bpf-next v4 6/7] bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign

[Lorenz Bauer]

On Wed, Jun 28, 2023 at 7:54 PM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:

> > +     reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
> > +                                       saddr, sport, daddr, ntohs(dport),
> > +                                       ehashfn);
> > +     if (!reuse_sk || reuse_sk == sk)
> > +             return sk;
> > +
> > +     /* We've chosen a new reuseport sock which is never refcounted. This
> > +      * implies that sk also isn't refcounted.
> > +      */
> > +     WARN_ON_ONCE(*refcounted);
>
> One more nit.
>
> WARN_ON_ONCE() should be tested before inet6?_lookup_reuseport() not to
> miss the !reuse_sk case.

I was just pondering that as well, but I came to the opposite
conclusion. In the !reuse_sk case we don't really know anything about
sk, except that it isn't part of a reuseport group. How can we be sure
that it's not refcounted?

Re: [PATCH bpf-next v4 6/7] bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign

[Kuniyuki Iwashima]

From: Lorenz Bauer <lmb@isovalent.com>
Date: Mon, 3 Jul 2023 10:57:23 +0100
> On Wed, Jun 28, 2023 at 7:54 PM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:
> 
> > > +     reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
> > > +                                       saddr, sport, daddr, ntohs(dport),
> > > +                                       ehashfn);
> > > +     if (!reuse_sk || reuse_sk == sk)
> > > +             return sk;
> > > +
> > > +     /* We've chosen a new reuseport sock which is never refcounted. This
> > > +      * implies that sk also isn't refcounted.
> > > +      */
> > > +     WARN_ON_ONCE(*refcounted);
> >
> > One more nit.
> >
> > WARN_ON_ONCE() should be tested before inet6?_lookup_reuseport() not to
> > miss the !reuse_sk case.
> 
> I was just pondering that as well, but I came to the opposite
> conclusion. In the !reuse_sk case we don't really know anything about
> sk, except that it isn't part of a reuseport group. How can we be sure
> that it's not refcounted?

Sorry for late reply.

What we know about sk before inet6?_lookup_reuseport() are

  (1) sk was full socket in bpf_sk_assign()
  (2) sk had SOCK_RCU_FREE in bpf_sk_assign()
  (3) sk was TCP_LISTEN here if TCP

After bpf_sk_assign(), reqsk is never converted to fullsock, and UDP
never clears SOCK_RCU_FREE.  If sk is TCP, now we are in the RCU grace
period and confirmed sk->sk_state was TCP_LISTEN.  Then, TCP_LISTEN sk
cannot be reused and SOCK_RCU_FREE is never cleared.

So, before/after inet6?_lookup_reuseport(), the fact that sk is not
refcounted here should not change in spite of that reuse_sk is NULL.

What do you think ?

Re: [PATCH bpf-next v4 6/7] bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign

[Lorenz Bauer]

On Thu, Jul 6, 2023 at 1:41 AM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:
>
> Sorry for late reply.
>
> What we know about sk before inet6?_lookup_reuseport() are
>
>   (1) sk was full socket in bpf_sk_assign()
>   (2) sk had SOCK_RCU_FREE in bpf_sk_assign()
>   (3) sk was TCP_LISTEN here if TCP

Are we looking at the same bpf_sk_assign? Confusingly there are two
very similarly named functions. The one we care about is:

BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
{
    if (!sk || flags != 0)
        return -EINVAL;
    if (!skb_at_tc_ingress(skb))
        return -EOPNOTSUPP;
    if (unlikely(dev_net(skb->dev) != sock_net(sk)))
        return -ENETUNREACH;
    if (sk_is_refcounted(sk) &&
        unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
        return -ENOENT;

    skb_orphan(skb);
    skb->sk = sk;
    skb->destructor = sock_pfree;

    return 0;
}

From this we can't tell what state the socket is in or whether it is
RCU freed or not.

Thanks
Lorenz

Re: [PATCH bpf-next v4 6/7] bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign

[Kuniyuki Iwashima]

From: Lorenz Bauer <lmb@isovalent.com>
Date: Thu, 6 Jul 2023 09:11:15 +0100
> On Thu, Jul 6, 2023 at 1:41 AM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:
> >
> > Sorry for late reply.
> >
> > What we know about sk before inet6?_lookup_reuseport() are
> >
> >   (1) sk was full socket in bpf_sk_assign()
> >   (2) sk had SOCK_RCU_FREE in bpf_sk_assign()
> >   (3) sk was TCP_LISTEN here if TCP
> 
> Are we looking at the same bpf_sk_assign? Confusingly there are two
> very similarly named functions. The one we care about is:
> 
> BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
> {
>     if (!sk || flags != 0)
>         return -EINVAL;
>     if (!skb_at_tc_ingress(skb))
>         return -EOPNOTSUPP;
>     if (unlikely(dev_net(skb->dev) != sock_net(sk)))
>         return -ENETUNREACH;
>     if (sk_is_refcounted(sk) &&
>         unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
>         return -ENOENT;
> 
>     skb_orphan(skb);
>     skb->sk = sk;
>     skb->destructor = sock_pfree;
> 
>     return 0;
> }
> 
> From this we can't tell what state the socket is in or whether it is
> RCU freed or not.

But we can in inet6?_steal_sock() by calling sk_is_refcounted() again
via skb_steal_sock().

In inet6?_steal_sock(), we call inet6?_lookup_reuseport() only for
sk that was a TCP listener or UDP non-connected socket until just before
the sk_state checks.  Then, we know *refcounted should be false for such
sockets even before inet6?_lookup_reuseport().

After the checks, sk might be poped out of the reuseport group before
inet6?_lookup_reuseport() and reuse_sk might be NULL, but it's not
related because *refcounted is a value for sk, not for reuse_sk.

Re: [PATCH bpf-next v4 6/7] bpf, net: Support SO_REUSEPORT sockets with bpf_sk_assign

[Alexei Starovoitov]

On Thu, Jul 6, 2023 at 8:33 AM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:
>
> From: Lorenz Bauer <lmb@isovalent.com>
> Date: Thu, 6 Jul 2023 09:11:15 +0100
> > On Thu, Jul 6, 2023 at 1:41 AM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:
> > >
> > > Sorry for late reply.
> > >
> > > What we know about sk before inet6?_lookup_reuseport() are
> > >
> > >   (1) sk was full socket in bpf_sk_assign()
> > >   (2) sk had SOCK_RCU_FREE in bpf_sk_assign()
> > >   (3) sk was TCP_LISTEN here if TCP
> >
> > Are we looking at the same bpf_sk_assign? Confusingly there are two
> > very similarly named functions. The one we care about is:
> >
> > BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
> > {
> >     if (!sk || flags != 0)
> >         return -EINVAL;
> >     if (!skb_at_tc_ingress(skb))
> >         return -EOPNOTSUPP;
> >     if (unlikely(dev_net(skb->dev) != sock_net(sk)))
> >         return -ENETUNREACH;
> >     if (sk_is_refcounted(sk) &&
> >         unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
> >         return -ENOENT;
> >
> >     skb_orphan(skb);
> >     skb->sk = sk;
> >     skb->destructor = sock_pfree;
> >
> >     return 0;
> > }
> >
> > From this we can't tell what state the socket is in or whether it is
> > RCU freed or not.
>
> But we can in inet6?_steal_sock() by calling sk_is_refcounted() again
> via skb_steal_sock().
>
> In inet6?_steal_sock(), we call inet6?_lookup_reuseport() only for
> sk that was a TCP listener or UDP non-connected socket until just before
> the sk_state checks.  Then, we know *refcounted should be false for such
> sockets even before inet6?_lookup_reuseport().
>
> After the checks, sk might be poped out of the reuseport group before
> inet6?_lookup_reuseport() and reuse_sk might be NULL, but it's not
> related because *refcounted is a value for sk, not for reuse_sk.

I was about to apply v5 before I noticed this discussion on v4.
Sounds like v6 will be needed.
Next time please continue discussion in the latest version.

[PATCH bpf-next v4 7/7] selftests/bpf: Test that SO_REUSEPORT can be used with sk_assign helper

[Lorenz Bauer]

From: Daniel Borkmann <daniel@iogearbox.net>

We use two programs to check that the new reuseport logic is executed
appropriately.

The first is a TC clsact program which bpf_sk_assigns
the skb to a UDP or TCP socket created by user space. Since the test
communicates via lo we see both directions of packets in the eBPF.
Traffic ingressing to the reuseport socket is identified by looking
at the destination port. For TCP, we additionally need to make sure
that we only assign the initial SYN packets towards our listening
socket. The network stack then creates a request socket which
transitions to ESTABLISHED after the 3WHS.

The second is a reuseport program which shares the fact that
it has been executed with user space. This tells us that the delayed
lookup mechanism is working.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Co-developed-by: Lorenz Bauer <lmb@isovalent.com>
Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
Cc: Joe Stringer <joe@cilium.io>
---
 tools/testing/selftests/bpf/network_helpers.c      |   3 +
 .../selftests/bpf/prog_tests/assign_reuse.c        | 197 +++++++++++++++++++++
 .../selftests/bpf/progs/test_assign_reuse.c        | 142 +++++++++++++++
 3 files changed, 342 insertions(+)

diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index a105c0cd008a..8a33bcea97de 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -423,6 +423,9 @@ struct nstoken *open_netns(const char *name)
 
 void close_netns(struct nstoken *token)
 {
+	if (!token)
+		return;
+
 	ASSERT_OK(setns(token->orig_netns_fd, CLONE_NEWNET), "setns");
 	close(token->orig_netns_fd);
 	free(token);
diff --git a/tools/testing/selftests/bpf/prog_tests/assign_reuse.c b/tools/testing/selftests/bpf/prog_tests/assign_reuse.c
new file mode 100644
index 000000000000..622f123410f4
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/assign_reuse.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2023 Isovalent */
+#include <uapi/linux/if_link.h>
+#include <test_progs.h>
+
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+
+#include "network_helpers.h"
+#include "test_assign_reuse.skel.h"
+
+#define NS_TEST "assign_reuse"
+#define LOOPBACK 1
+#define PORT 4443
+
+static int attach_reuseport(int sock_fd, int prog_fd)
+{
+	return setsockopt(sock_fd, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF,
+			  &prog_fd, sizeof(prog_fd));
+}
+
+static __u64 cookie(int fd)
+{
+	__u64 cookie = 0;
+	socklen_t cookie_len = sizeof(cookie);
+	int ret;
+
+	ret = getsockopt(fd, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len);
+	ASSERT_OK(ret, "cookie");
+	ASSERT_GT(cookie, 0, "cookie_invalid");
+
+	return cookie;
+}
+
+static int echo_test_udp(int fd_sv)
+{
+	struct sockaddr_storage addr = {};
+	socklen_t len = sizeof(addr);
+	char buff[1] = {};
+	int fd_cl = -1, ret;
+
+	fd_cl = connect_to_fd(fd_sv, 100);
+	ASSERT_GT(fd_cl, 0, "create_client");
+	ASSERT_EQ(getsockname(fd_cl, (void *)&addr, &len), 0, "getsockname");
+
+	ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client");
+
+	ret = recv(fd_sv, buff, sizeof(buff), 0);
+	if (ret < 0)
+		return errno;
+
+	ASSERT_EQ(ret, 1, "recv_server");
+	ASSERT_EQ(sendto(fd_sv, buff, sizeof(buff), 0, (void *)&addr, len), 1, "send_server");
+	ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client");
+	close(fd_cl);
+	return 0;
+}
+
+static int echo_test_tcp(int fd_sv)
+{
+	char buff[1] = {};
+	int fd_cl = -1, fd_sv_cl = -1;
+
+	fd_cl = connect_to_fd(fd_sv, 100);
+	if (fd_cl < 0)
+		return errno;
+
+	fd_sv_cl = accept(fd_sv, NULL, NULL);
+	ASSERT_GE(fd_sv_cl, 0, "accept_fd");
+
+	ASSERT_EQ(send(fd_cl, buff, sizeof(buff), 0), 1, "send_client");
+	ASSERT_EQ(recv(fd_sv_cl, buff, sizeof(buff), 0), 1, "recv_server");
+	ASSERT_EQ(send(fd_sv_cl, buff, sizeof(buff), 0), 1, "send_server");
+	ASSERT_EQ(recv(fd_cl, buff, sizeof(buff), 0), 1, "recv_client");
+	close(fd_sv_cl);
+	close(fd_cl);
+	return 0;
+}
+
+void run_assign_reuse(int family, int sotype, const char *ip, __u16 port)
+{
+	DECLARE_LIBBPF_OPTS(bpf_tc_hook, tc_hook,
+		.ifindex = LOOPBACK,
+		.attach_point = BPF_TC_INGRESS,
+	);
+	DECLARE_LIBBPF_OPTS(bpf_tc_opts, tc_opts,
+		.handle = 1,
+		.priority = 1,
+	);
+	bool hook_created = false, tc_attached = false;
+	int ret, fd_tc, fd_accept, fd_drop, fd_map;
+	int *fd_sv = NULL;
+	__u64 fd_val;
+	struct test_assign_reuse *skel;
+	const int zero = 0;
+
+	skel = test_assign_reuse__open();
+	if (!ASSERT_OK_PTR(skel, "skel_open"))
+		goto cleanup;
+
+	skel->rodata->dest_port = port;
+
+	ret = test_assign_reuse__load(skel);
+	if (!ASSERT_OK(ret, "skel_load"))
+		goto cleanup;
+
+	ASSERT_EQ(skel->bss->sk_cookie_seen, 0, "cookie_init");
+
+	fd_tc = bpf_program__fd(skel->progs.tc_main);
+	fd_accept = bpf_program__fd(skel->progs.reuse_accept);
+	fd_drop = bpf_program__fd(skel->progs.reuse_drop);
+	fd_map = bpf_map__fd(skel->maps.sk_map);
+
+	fd_sv = start_reuseport_server(family, sotype, ip, port, 100, 1);
+	if (!ASSERT_NEQ(fd_sv, NULL, "start_reuseport_server"))
+		goto cleanup;
+
+	ret = attach_reuseport(*fd_sv, fd_drop);
+	if (!ASSERT_OK(ret, "attach_reuseport"))
+		goto cleanup;
+
+	fd_val = *fd_sv;
+	ret = bpf_map_update_elem(fd_map, &zero, &fd_val, BPF_NOEXIST);
+	if (!ASSERT_OK(ret, "bpf_sk_map"))
+		goto cleanup;
+
+	ret = bpf_tc_hook_create(&tc_hook);
+	if (ret == 0)
+		hook_created = true;
+	ret = ret == -EEXIST ? 0 : ret;
+	if (!ASSERT_OK(ret, "bpf_tc_hook_create"))
+		goto cleanup;
+
+	tc_opts.prog_fd = fd_tc;
+	ret = bpf_tc_attach(&tc_hook, &tc_opts);
+	if (!ASSERT_OK(ret, "bpf_tc_attach"))
+		goto cleanup;
+	tc_attached = true;
+
+	if (sotype == SOCK_STREAM)
+		ASSERT_EQ(echo_test_tcp(*fd_sv), ECONNREFUSED, "drop_tcp");
+	else
+		ASSERT_EQ(echo_test_udp(*fd_sv), EAGAIN, "drop_udp");
+	ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once");
+
+	skel->bss->sk_cookie_seen = 0;
+	skel->bss->reuseport_executed = 0;
+	ASSERT_OK(attach_reuseport(*fd_sv, fd_accept), "attach_reuseport(accept)");
+
+	if (sotype == SOCK_STREAM)
+		ASSERT_EQ(echo_test_tcp(*fd_sv), 0, "echo_tcp");
+	else
+		ASSERT_EQ(echo_test_udp(*fd_sv), 0, "echo_udp");
+
+	ASSERT_EQ(skel->bss->sk_cookie_seen, cookie(*fd_sv),
+		  "cookie_mismatch");
+	ASSERT_EQ(skel->bss->reuseport_executed, 1, "program executed once");
+cleanup:
+	if (tc_attached) {
+		tc_opts.flags = tc_opts.prog_fd = tc_opts.prog_id = 0;
+		ret = bpf_tc_detach(&tc_hook, &tc_opts);
+		ASSERT_OK(ret, "bpf_tc_detach");
+	}
+	if (hook_created) {
+		tc_hook.attach_point = BPF_TC_INGRESS | BPF_TC_EGRESS;
+		bpf_tc_hook_destroy(&tc_hook);
+	}
+	test_assign_reuse__destroy(skel);
+	free_fds(fd_sv, 1);
+}
+
+void test_assign_reuse(void)
+{
+	struct nstoken *tok = NULL;
+
+	SYS(out, "ip netns add %s", NS_TEST);
+	SYS(cleanup, "ip -net %s link set dev lo up", NS_TEST);
+
+	tok = open_netns(NS_TEST);
+	if (!ASSERT_OK_PTR(tok, "netns token"))
+		return;
+
+	if (test__start_subtest("tcpv4"))
+		run_assign_reuse(AF_INET, SOCK_STREAM, "127.0.0.1", PORT);
+	if (test__start_subtest("tcpv6"))
+		run_assign_reuse(AF_INET6, SOCK_STREAM, "::1", PORT);
+	if (test__start_subtest("udpv4"))
+		run_assign_reuse(AF_INET, SOCK_DGRAM, "127.0.0.1", PORT);
+	if (test__start_subtest("udpv6"))
+		run_assign_reuse(AF_INET6, SOCK_DGRAM, "::1", PORT);
+
+cleanup:
+	close_netns(tok);
+	SYS_NOFAIL("ip netns delete %s", NS_TEST);
+out:
+	return;
+}
diff --git a/tools/testing/selftests/bpf/progs/test_assign_reuse.c b/tools/testing/selftests/bpf/progs/test_assign_reuse.c
new file mode 100644
index 000000000000..4f2e2321ea06
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_assign_reuse.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2023 Isovalent */
+#include <stdbool.h>
+#include <linux/bpf.h>
+#include <linux/if_ether.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <bpf/bpf_endian.h>
+#include <bpf/bpf_helpers.h>
+#include <linux/pkt_cls.h>
+
+char LICENSE[] SEC("license") = "GPL";
+
+__u64 sk_cookie_seen;
+__u64 reuseport_executed;
+union {
+	struct tcphdr tcp;
+	struct udphdr udp;
+} headers;
+
+const volatile __u16 dest_port;
+
+struct {
+	__uint(type, BPF_MAP_TYPE_SOCKMAP);
+	__uint(max_entries, 1);
+	__type(key, __u32);
+	__type(value, __u64);
+} sk_map SEC(".maps");
+
+SEC("sk_reuseport")
+int reuse_accept(struct sk_reuseport_md *ctx)
+{
+	reuseport_executed++;
+
+	if (ctx->ip_protocol == IPPROTO_TCP) {
+		if (ctx->data + sizeof(headers.tcp) > ctx->data_end)
+			return SK_DROP;
+
+		if (__builtin_memcmp(&headers.tcp, ctx->data, sizeof(headers.tcp)) != 0)
+			return SK_DROP;
+	} else if (ctx->ip_protocol == IPPROTO_UDP) {
+		if (ctx->data + sizeof(headers.udp) > ctx->data_end)
+			return SK_DROP;
+
+		if (__builtin_memcmp(&headers.udp, ctx->data, sizeof(headers.udp)) != 0)
+			return SK_DROP;
+	} else {
+		return SK_DROP;
+	}
+
+	sk_cookie_seen = bpf_get_socket_cookie(ctx->sk);
+	return SK_PASS;
+}
+
+SEC("sk_reuseport")
+int reuse_drop(struct sk_reuseport_md *ctx)
+{
+	reuseport_executed++;
+	sk_cookie_seen = 0;
+	return SK_DROP;
+}
+
+static int
+assign_sk(struct __sk_buff *skb)
+{
+	int zero = 0, ret = 0;
+	struct bpf_sock *sk;
+
+	sk = bpf_map_lookup_elem(&sk_map, &zero);
+	if (!sk)
+		return TC_ACT_SHOT;
+	ret = bpf_sk_assign(skb, sk, 0);
+	bpf_sk_release(sk);
+	return ret ? TC_ACT_SHOT : TC_ACT_OK;
+}
+
+static bool
+maybe_assign_tcp(struct __sk_buff *skb, struct tcphdr *th)
+{
+	if (th + 1 > (void *)(long)(skb->data_end))
+		return TC_ACT_SHOT;
+
+	if (!th->syn || th->ack || th->dest != bpf_htons(dest_port))
+		return TC_ACT_OK;
+
+	__builtin_memcpy(&headers.tcp, th, sizeof(headers.tcp));
+	return assign_sk(skb);
+}
+
+static bool
+maybe_assign_udp(struct __sk_buff *skb, struct udphdr *uh)
+{
+	if (uh + 1 > (void *)(long)(skb->data_end))
+		return TC_ACT_SHOT;
+
+	if (uh->dest != bpf_htons(dest_port))
+		return TC_ACT_OK;
+
+	__builtin_memcpy(&headers.udp, uh, sizeof(headers.udp));
+	return assign_sk(skb);
+}
+
+SEC("tc")
+int tc_main(struct __sk_buff *skb)
+{
+	void *data_end = (void *)(long)skb->data_end;
+	void *data = (void *)(long)skb->data;
+	struct ethhdr *eth;
+
+	eth = (struct ethhdr *)(data);
+	if (eth + 1 > data_end)
+		return TC_ACT_SHOT;
+
+	if (eth->h_proto == bpf_htons(ETH_P_IP)) {
+		struct iphdr *iph = (struct iphdr *)(data + sizeof(*eth));
+
+		if (iph + 1 > data_end)
+			return TC_ACT_SHOT;
+
+		if (iph->protocol == IPPROTO_TCP)
+			return maybe_assign_tcp(skb, (struct tcphdr *)(iph + 1));
+		else if (iph->protocol == IPPROTO_UDP)
+			return maybe_assign_udp(skb, (struct udphdr *)(iph + 1));
+		else
+			return TC_ACT_SHOT;
+	} else {
+		struct ipv6hdr *ip6h = (struct ipv6hdr *)(data + sizeof(*eth));
+
+		if (ip6h + 1 > data_end)
+			return TC_ACT_SHOT;
+
+		if (ip6h->nexthdr == IPPROTO_TCP)
+			return maybe_assign_tcp(skb, (struct tcphdr *)(ip6h + 1));
+		else if (ip6h->nexthdr == IPPROTO_UDP)
+			return maybe_assign_udp(skb, (struct udphdr *)(ip6h + 1));
+		else
+			return TC_ACT_SHOT;
+	}
+}

-- 
2.40.1