From patchwork Fri Oct 15 11:23:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Pashmfouroush X-Patchwork-Id: 12561069 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD032C433FE for ; Fri, 15 Oct 2021 11:24:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A19BE61163 for ; Fri, 15 Oct 2021 11:24:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238486AbhJOL0U (ORCPT ); Fri, 15 Oct 2021 07:26:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238477AbhJOL0T (ORCPT ); Fri, 15 Oct 2021 07:26:19 -0400 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50F14C061764 for ; Fri, 15 Oct 2021 04:24:12 -0700 (PDT) Received: by mail-wr1-x42f.google.com with SMTP id e3so25699434wrc.11 for ; Fri, 15 Oct 2021 04:24:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=scltVqB0ADiyG2kyTo2Yvt+Yks0Dgd2QhYZsV3VCMSk=; b=CqSKHXaaVC/9b8Rcjd/zhxzMAtN/2nENA4jbage0RmBDwBJLVce0cjYHuDR1TE1fcr 1NExAhhAH7uYkDJ9naMUbqbEI8uIZorlcIjt84ez/EWqC2YJj9ppxbKLcm4pggOVZx9W tr9cQ5cKKkAneToZpn22TuaHjGzILtIpGMsK8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=scltVqB0ADiyG2kyTo2Yvt+Yks0Dgd2QhYZsV3VCMSk=; b=SVoMKHb1vkl1Kr6ZpZqBACNiyxI3AaKCv/X+FMLxg0Pqv6PtXJRKl17YieFFU8xXJM ZL3kXTuNTNGbo0gFziAiwnk8LoNclALuIVFOsxzE6sBhNlVApFQu83KemxTK7LCAmoTP UQTI6ByzI8uolwhXWunobEA592l0ZTNm0riGqWWxJLS6zSo/k1NZEDJgkqoFsd4QgWZ5 sBtCi0zmv0b5EtTChKZNbrWAutLguldmXgI6HsLSbuLraPxh+CPuTaVUWBkr787t9Hkx 0UUzB+BmuJveHcmRSmyTDe9viuEfTIeudtEAgfkvWc3VceClNB4J72XT4vZ5TKwN63CP R5Aw== X-Gm-Message-State: AOAM530fvVknZMC7OmJirsvYcqjIzMpsBxvYB6xcfGTxsi5BXQePiNpE OO8UZOB62+swILnx/SP/1S8fcA== X-Google-Smtp-Source: ABdhPJxigk/8CrjqrkPhu3WRHxLMOrjGGSrxpqrl6Jbhf/Ed4u2jxRh1jSnevbt9jyVuD+BXEnfduA== X-Received: by 2002:adf:8bcf:: with SMTP id w15mr13820673wra.144.1634297050872; Fri, 15 Oct 2021 04:24:10 -0700 (PDT) Received: from kharboze.dr-pashinator-m-d.gmail.com.beta.tailscale.net ([2a02:390:85ca:6:be5f:f4ff:fe85:e406]) by smtp.gmail.com with ESMTPSA id o12sm4631223wrv.78.2021.10.15.04.24.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Oct 2021 04:24:10 -0700 (PDT) From: Mark Pashmfouroush To: markpash@cloudflare.com Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , "David S. Miller" , Jakub Kicinski , Hideaki YOSHIFUJI , David Ahern , Shuah Khan , Florent Revest , Brendan Jackman , Joe Stringer , Jesper Dangaard Brouer , Hangbin Liu , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgen?= =?utf-8?q?sen?= , Lorenz Bauer , Dave Marchevsky , Luke Nelson , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next 1/2] bpf: Add ifindex to bpf_sk_lookup Date: Fri, 15 Oct 2021 12:23:29 +0100 Message-Id: <20211015112336.1973229-2-markpash@cloudflare.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211015112336.1973229-1-markpash@cloudflare.com> References: <20211015112336.1973229-1-markpash@cloudflare.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org It may be helpful to have access to the ifindex during bpf socket lookup. Add this to the bpf_sk_lookup API. Signed-off-by: Mark Pashmfouroush Acked-by: John Fastabend diff --git a/include/linux/filter.h b/include/linux/filter.h index 47f80adbe744..54ffd8036be6 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -1370,6 +1370,7 @@ struct bpf_sk_lookup_kern { const struct in6_addr *daddr; } v6; struct sock *selected_sk; + u32 ifindex; bool no_reuseport; }; @@ -1432,7 +1433,7 @@ extern struct static_key_false bpf_sk_lookup_enabled; static inline bool bpf_sk_lookup_run_v4(struct net *net, int protocol, const __be32 saddr, const __be16 sport, const __be32 daddr, const u16 dport, - struct sock **psk) + const int ifindex, struct sock **psk) { struct bpf_prog_array *run_array; struct sock *selected_sk = NULL; @@ -1448,6 +1449,7 @@ static inline bool bpf_sk_lookup_run_v4(struct net *net, int protocol, .v4.daddr = daddr, .sport = sport, .dport = dport, + .ifindex = ifindex, }; u32 act; @@ -1470,7 +1472,7 @@ static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol, const __be16 sport, const struct in6_addr *daddr, const u16 dport, - struct sock **psk) + const int ifindex, struct sock **psk) { struct bpf_prog_array *run_array; struct sock *selected_sk = NULL; @@ -1486,6 +1488,7 @@ static inline bool bpf_sk_lookup_run_v6(struct net *net, int protocol, .v6.daddr = daddr, .sport = sport, .dport = dport, + .ifindex = ifindex, }; u32 act; diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 6fc59d61937a..9bd3e8b8a659 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -6262,6 +6262,7 @@ struct bpf_sk_lookup { __u32 local_ip4; /* Network byte order */ __u32 local_ip6[4]; /* Network byte order */ __u32 local_port; /* Host byte order */ + __u32 ifindex; /* Maps to skb->dev->ifindex */ }; /* diff --git a/net/core/filter.c b/net/core/filter.c index 4bace37a6a44..9514c6bbd117 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -10491,6 +10491,7 @@ static bool sk_lookup_is_valid_access(int off, int size, case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]): case bpf_ctx_range(struct bpf_sk_lookup, remote_port): case bpf_ctx_range(struct bpf_sk_lookup, local_port): + case bpf_ctx_range(struct bpf_sk_lookup, ifindex): bpf_ctx_record_field_size(info, sizeof(__u32)); return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32)); @@ -10580,6 +10581,12 @@ static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type, bpf_target_off(struct bpf_sk_lookup_kern, dport, 2, target_size)); break; + + case offsetof(struct bpf_sk_lookup, ifindex): + *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, + bpf_target_off(struct bpf_sk_lookup_kern, + ifindex, 4, target_size)); + break; } return insn - insn_buf; diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index 80aeaf9e6e16..088bb6c27114 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -305,7 +305,7 @@ 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) + __be32 daddr, u16 hnum, const int dif) { struct sock *sk, *reuse_sk; bool no_reuseport; @@ -313,8 +313,8 @@ static inline struct sock *inet_lookup_run_bpf(struct net *net, if (hashinfo != &tcp_hashinfo) return NULL; /* only TCP is supported */ - no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP, - saddr, sport, daddr, hnum, &sk); + no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_TCP, saddr, sport, + daddr, hnum, dif, &sk); if (no_reuseport || IS_ERR_OR_NULL(sk)) return sk; @@ -338,7 +338,7 @@ struct sock *__inet_lookup_listener(struct net *net, /* 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); + saddr, sport, daddr, hnum, dif); if (result) goto done; } diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 2a7825a5b842..f4ddfa38449e 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -459,7 +459,7 @@ 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) + __be32 daddr, u16 hnum, const int dif) { struct sock *sk, *reuse_sk; bool no_reuseport; @@ -467,8 +467,8 @@ static struct sock *udp4_lookup_run_bpf(struct net *net, if (udptable != &udp_table) return NULL; /* only UDP is supported */ - no_reuseport = bpf_sk_lookup_run_v4(net, IPPROTO_UDP, - saddr, sport, daddr, hnum, &sk); + 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; @@ -504,7 +504,7 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, /* Lookup redirect from BPF */ if (static_branch_unlikely(&bpf_sk_lookup_enabled)) { sk = udp4_lookup_run_bpf(net, udptable, skb, - saddr, sport, daddr, hnum); + saddr, sport, daddr, hnum, dif); if (sk) { result = sk; goto done; diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c index 55c290d55605..8d25cb5d124b 100644 --- a/net/ipv6/inet6_hashtables.c +++ b/net/ipv6/inet6_hashtables.c @@ -165,7 +165,7 @@ static inline struct sock *inet6_lookup_run_bpf(struct net *net, const struct in6_addr *saddr, const __be16 sport, const struct in6_addr *daddr, - const u16 hnum) + const u16 hnum, const int dif) { struct sock *sk, *reuse_sk; bool no_reuseport; @@ -173,8 +173,8 @@ static inline struct sock *inet6_lookup_run_bpf(struct net *net, if (hashinfo != &tcp_hashinfo) return NULL; /* only TCP is supported */ - no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_TCP, - saddr, sport, daddr, hnum, &sk); + no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_TCP, saddr, sport, + daddr, hnum, dif, &sk); if (no_reuseport || IS_ERR_OR_NULL(sk)) return sk; @@ -198,7 +198,7 @@ struct sock *inet6_lookup_listener(struct net *net, /* 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); + saddr, sport, daddr, hnum, dif); if (result) goto done; } diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index e505bb007e9f..77ba0917b3ea 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -194,7 +194,7 @@ static inline struct sock *udp6_lookup_run_bpf(struct net *net, const struct in6_addr *saddr, __be16 sport, const struct in6_addr *daddr, - u16 hnum) + u16 hnum, const int dif) { struct sock *sk, *reuse_sk; bool no_reuseport; @@ -202,8 +202,8 @@ static inline struct sock *udp6_lookup_run_bpf(struct net *net, if (udptable != &udp_table) return NULL; /* only UDP is supported */ - no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, - saddr, sport, daddr, hnum, &sk); + 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; @@ -239,7 +239,7 @@ struct sock *__udp6_lib_lookup(struct net *net, /* Lookup redirect from BPF */ if (static_branch_unlikely(&bpf_sk_lookup_enabled)) { sk = udp6_lookup_run_bpf(net, udptable, skb, - saddr, sport, daddr, hnum); + saddr, sport, daddr, hnum, dif); if (sk) { result = sk; goto done; diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 6fc59d61937a..9bd3e8b8a659 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -6262,6 +6262,7 @@ struct bpf_sk_lookup { __u32 local_ip4; /* Network byte order */ __u32 local_ip6[4]; /* Network byte order */ __u32 local_port; /* Host byte order */ + __u32 ifindex; /* Maps to skb->dev->ifindex */ }; /* From patchwork Fri Oct 15 11:23:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Pashmfouroush X-Patchwork-Id: 12561071 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E22EC433F5 for ; Fri, 15 Oct 2021 11:24:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 200F061108 for ; Fri, 15 Oct 2021 11:24:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238485AbhJOL00 (ORCPT ); Fri, 15 Oct 2021 07:26:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40636 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238457AbhJOL0Z (ORCPT ); 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Miller" , Jakub Kicinski , Hideaki YOSHIFUJI , David Ahern , Shuah Khan , Florent Revest , Brendan Jackman , Joe Stringer , Jesper Dangaard Brouer , Hangbin Liu , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgen?= =?utf-8?q?sen?= , Lorenz Bauer , Dave Marchevsky , Luke Nelson , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next 2/2] selftests/bpf: Add tests for accessing ifindex in bpf_sk_lookup Date: Fri, 15 Oct 2021 12:23:30 +0100 Message-Id: <20211015112336.1973229-3-markpash@cloudflare.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211015112336.1973229-1-markpash@cloudflare.com> References: <20211015112336.1973229-1-markpash@cloudflare.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org A new field was added to the bpf_sk_lookup data that users can access. Add tests that validate that the new ifindex field contains the right data. Signed-off-by: Mark Pashmfouroush Acked-by: John Fastabend diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c index aee41547e7f4..951e5dcf297e 100644 --- a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c +++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c @@ -937,6 +937,37 @@ static void test_drop_on_lookup(struct test_sk_lookup *skel) .connect_to = { EXT_IP6, EXT_PORT }, .listen_at = { EXT_IP6, INT_PORT }, }, + /* The program will drop on success, meaning that the ifindex + * was 1. + */ + { + .desc = "TCP IPv4 drop on valid ifindex", + .lookup_prog = skel->progs.check_ifindex, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { EXT_IP4, EXT_PORT }, + }, + { + .desc = "TCP IPv6 drop on valid ifindex", + .lookup_prog = skel->progs.check_ifindex, + .sotype = SOCK_STREAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { EXT_IP6, EXT_PORT }, + }, + { + .desc = "UDP IPv4 drop on valid ifindex", + .lookup_prog = skel->progs.check_ifindex, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP4, EXT_PORT }, + .listen_at = { EXT_IP4, EXT_PORT }, + }, + { + .desc = "UDP IPv6 drop on valid ifindex", + .lookup_prog = skel->progs.check_ifindex, + .sotype = SOCK_DGRAM, + .connect_to = { EXT_IP6, EXT_PORT }, + .listen_at = { EXT_IP6, EXT_PORT }, + }, }; const struct test *t; diff --git a/tools/testing/selftests/bpf/progs/test_sk_lookup.c b/tools/testing/selftests/bpf/progs/test_sk_lookup.c index 19d2465d9442..0f3283bfe3b6 100644 --- a/tools/testing/selftests/bpf/progs/test_sk_lookup.c +++ b/tools/testing/selftests/bpf/progs/test_sk_lookup.c @@ -84,6 +84,14 @@ int lookup_drop(struct bpf_sk_lookup *ctx) return SK_DROP; } +SEC("sk_lookup") +int check_ifindex(struct bpf_sk_lookup *ctx) +{ + if (ctx->ifindex == 1) + return SK_DROP; + return SK_PASS; +} + SEC("sk_reuseport") int reuseport_pass(struct sk_reuseport_md *ctx) { diff --git a/tools/testing/selftests/bpf/verifier/ctx_sk_lookup.c b/tools/testing/selftests/bpf/verifier/ctx_sk_lookup.c index d78627be060f..0b3088da1e89 100644 --- a/tools/testing/selftests/bpf/verifier/ctx_sk_lookup.c +++ b/tools/testing/selftests/bpf/verifier/ctx_sk_lookup.c @@ -229,6 +229,24 @@ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, offsetof(struct bpf_sk_lookup, local_port)), + /* 1-byte read from ifindex field */ + BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, + offsetof(struct bpf_sk_lookup, ifindex)), + BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, + offsetof(struct bpf_sk_lookup, ifindex) + 1), + BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, + offsetof(struct bpf_sk_lookup, ifindex) + 2), + BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1, + offsetof(struct bpf_sk_lookup, ifindex) + 3), + /* 2-byte read from ifindex field */ + BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_1, + offsetof(struct bpf_sk_lookup, ifindex)), + BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_1, + offsetof(struct bpf_sk_lookup, ifindex) + 2), + /* 4-byte read from ifindex field */ + BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1, + offsetof(struct bpf_sk_lookup, ifindex)), + /* 8-byte read from sk field */ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, offsetof(struct bpf_sk_lookup, sk)), @@ -351,6 +369,20 @@ .expected_attach_type = BPF_SK_LOOKUP, .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS, }, +{ + "invalid 8-byte read from bpf_sk_lookup ifindex field", + .insns = { + BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, + offsetof(struct bpf_sk_lookup, ifindex)), + BPF_MOV32_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }, + .errstr = "invalid bpf_context access", + .result = REJECT, + .prog_type = BPF_PROG_TYPE_SK_LOOKUP, + .expected_attach_type = BPF_SK_LOOKUP, + .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS, +}, /* invalid 1,2,4-byte reads from 8-byte fields in bpf_sk_lookup */ { "invalid 4-byte read from bpf_sk_lookup sk field",