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Miller" , Jakub Kicinski , Shuah Khan , Jesper Dangaard Brouer , "Maxim Mikityanskiy" , Tariq Toukan Subject: [PATCH bpf v5 1/2] bpf: Support dual-stack sockets in bpf_tcp_check_syncookie Date: Wed, 6 Apr 2022 15:41:12 +0300 Message-ID: <20220406124113.2795730-1-maximmi@nvidia.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 88f42e7e-5005-4f42-3fc0-08da17cace49 X-MS-TrafficTypeDiagnostic: DM6PR12MB3052:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.234; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:mail.nvidia.com; PTR:InfoNoRecords; CAT:NONE; SFS:(13230001)(4636009)(40470700004)(46966006)(36840700001)(6666004)(82310400005)(40460700003)(186003)(83380400001)(1076003)(47076005)(86362001)(316002)(26005)(336012)(508600001)(7416002)(5660300002)(426003)(8676002)(36860700001)(70586007)(36756003)(70206006)(7696005)(4326008)(8936002)(81166007)(107886003)(110136005)(54906003)(2616005)(356005)(2906002)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Apr 2022 12:41:43.6992 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 88f42e7e-5005-4f42-3fc0-08da17cace49 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[12.22.5.234]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT015.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3052 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org bpf_tcp_gen_syncookie looks at the IP version in the IP header and validates the address family of the socket. It supports IPv4 packets in AF_INET6 dual-stack sockets. On the other hand, bpf_tcp_check_syncookie looks only at the address family of the socket, ignoring the real IP version in headers, and validates only the packet size. This implementation has some drawbacks: 1. Packets are not validated properly, allowing a BPF program to trick bpf_tcp_check_syncookie into handling an IPv6 packet on an IPv4 socket. 2. Dual-stack sockets fail the checks on IPv4 packets. IPv4 clients end up receiving a SYNACK with the cookie, but the following ACK gets dropped. This patch fixes these issues by changing the checks in bpf_tcp_check_syncookie to match the ones in bpf_tcp_gen_syncookie. IP version from the header is taken into account, and it is validated properly with address family. Fixes: 399040847084 ("bpf: add helper to check for a valid SYN cookie") Signed-off-by: Maxim Mikityanskiy Reviewed-by: Tariq Toukan Acked-by: Arthur Fabre --- net/core/filter.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/net/core/filter.c b/net/core/filter.c index a7044e98765e..64470a727ef7 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -7016,24 +7016,33 @@ BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len if (!th->ack || th->rst || th->syn) return -ENOENT; + if (unlikely(iph_len < sizeof(struct iphdr))) + return -EINVAL; + if (tcp_synq_no_recent_overflow(sk)) return -ENOENT; cookie = ntohl(th->ack_seq) - 1; - switch (sk->sk_family) { - case AF_INET: - if (unlikely(iph_len < sizeof(struct iphdr))) + /* Both struct iphdr and struct ipv6hdr have the version field at the + * same offset so we can cast to the shorter header (struct iphdr). + */ + switch (((struct iphdr *)iph)->version) { + case 4: + if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) return -EINVAL; ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); break; #if IS_BUILTIN(CONFIG_IPV6) - case AF_INET6: + case 6: if (unlikely(iph_len < sizeof(struct ipv6hdr))) return -EINVAL; + if (sk->sk_family != AF_INET6) + return -EINVAL; + ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); break; #endif /* CONFIG_IPV6 */ From patchwork Wed Apr 6 12:41:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Mikityanskiy X-Patchwork-Id: 558417 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6FE1AC4332F for ; Wed, 6 Apr 2022 15:31:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236125AbiDFPdc (ORCPT ); Wed, 6 Apr 2022 11:33:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41880 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236191AbiDFPdO (ORCPT ); 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Miller" , Jakub Kicinski , Shuah Khan , Jesper Dangaard Brouer , "Maxim Mikityanskiy" Subject: [PATCH bpf v5 2/2] bpf: Adjust bpf_tcp_check_syncookie selftest to test dual-stack sockets Date: Wed, 6 Apr 2022 15:41:13 +0300 Message-ID: <20220406124113.2795730-2-maximmi@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220406124113.2795730-1-maximmi@nvidia.com> References: <20220406124113.2795730-1-maximmi@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d0c8dbfc-1e34-4a14-f4db-08da17cad167 X-MS-TrafficTypeDiagnostic: BN6PR12MB1810:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.235; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:mail.nvidia.com; PTR:InfoNoRecords; CAT:NONE; SFS:(13230001)(4636009)(46966006)(40470700004)(36840700001)(7696005)(6666004)(426003)(36860700001)(2616005)(47076005)(83380400001)(107886003)(26005)(186003)(336012)(1076003)(7416002)(8936002)(4326008)(36756003)(70206006)(81166007)(5660300002)(82310400005)(356005)(8676002)(2906002)(316002)(508600001)(110136005)(40460700003)(54906003)(86362001)(70586007)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Apr 2022 12:41:48.8711 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d0c8dbfc-1e34-4a14-f4db-08da17cad167 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[12.22.5.235]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT010.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR12MB1810 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The previous commit fixed support for dual-stack sockets in bpf_tcp_check_syncookie. This commit adjusts the selftest to verify the fixed functionality. Signed-off-by: Maxim Mikityanskiy Acked-by: Arthur Fabre --- .../bpf/test_tcp_check_syncookie_user.c | 78 ++++++++++++++----- 1 file changed, 59 insertions(+), 19 deletions(-) diff --git a/tools/testing/selftests/bpf/test_tcp_check_syncookie_user.c b/tools/testing/selftests/bpf/test_tcp_check_syncookie_user.c index b9e991d43155..e7775d3bbe08 100644 --- a/tools/testing/selftests/bpf/test_tcp_check_syncookie_user.c +++ b/tools/testing/selftests/bpf/test_tcp_check_syncookie_user.c @@ -18,8 +18,9 @@ #include "bpf_rlimit.h" #include "cgroup_helpers.h" -static int start_server(const struct sockaddr *addr, socklen_t len) +static int start_server(const struct sockaddr *addr, socklen_t len, bool dual) { + int mode = !dual; int fd; fd = socket(addr->sa_family, SOCK_STREAM, 0); @@ -28,6 +29,14 @@ static int start_server(const struct sockaddr *addr, socklen_t len) goto out; } + if (addr->sa_family == AF_INET6) { + if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&mode, + sizeof(mode)) == -1) { + log_err("Failed to set the dual-stack mode"); + goto close_out; + } + } + if (bind(fd, addr, len) == -1) { log_err("Failed to bind server socket"); goto close_out; @@ -47,24 +56,17 @@ static int start_server(const struct sockaddr *addr, socklen_t len) return fd; } -static int connect_to_server(int server_fd) +static int connect_to_server(const struct sockaddr *addr, socklen_t len) { - struct sockaddr_storage addr; - socklen_t len = sizeof(addr); int fd = -1; - if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) { - log_err("Failed to get server addr"); - goto out; - } - - fd = socket(addr.ss_family, SOCK_STREAM, 0); + fd = socket(addr->sa_family, SOCK_STREAM, 0); if (fd == -1) { log_err("Failed to create client socket"); goto out; } - if (connect(fd, (const struct sockaddr *)&addr, len) == -1) { + if (connect(fd, (const struct sockaddr *)addr, len) == -1) { log_err("Fail to connect to server"); goto close_out; } @@ -116,7 +118,8 @@ static int get_map_fd_by_prog_id(int prog_id, bool *xdp) return map_fd; } -static int run_test(int server_fd, int results_fd, bool xdp) +static int run_test(int server_fd, int results_fd, bool xdp, + const struct sockaddr *addr, socklen_t len) { int client = -1, srv_client = -1; int ret = 0; @@ -142,7 +145,7 @@ static int run_test(int server_fd, int results_fd, bool xdp) goto err; } - client = connect_to_server(server_fd); + client = connect_to_server(addr, len); if (client == -1) goto err; @@ -199,12 +202,30 @@ static int run_test(int server_fd, int results_fd, bool xdp) return ret; } +static bool get_port(int server_fd, in_port_t *port) +{ + struct sockaddr_in addr; + socklen_t len = sizeof(addr); + + if (getsockname(server_fd, (struct sockaddr *)&addr, &len)) { + log_err("Failed to get server addr"); + return false; + } + + /* sin_port and sin6_port are located at the same offset. */ + *port = addr.sin_port; + return true; +} + int main(int argc, char **argv) { struct sockaddr_in addr4; struct sockaddr_in6 addr6; + struct sockaddr_in addr4dual; + struct sockaddr_in6 addr6dual; int server = -1; int server_v6 = -1; + int server_dual = -1; int results = -1; int err = 0; bool xdp; @@ -224,25 +245,43 @@ int main(int argc, char **argv) addr4.sin_family = AF_INET; addr4.sin_addr.s_addr = htonl(INADDR_LOOPBACK); addr4.sin_port = 0; + memcpy(&addr4dual, &addr4, sizeof(addr4dual)); memset(&addr6, 0, sizeof(addr6)); addr6.sin6_family = AF_INET6; addr6.sin6_addr = in6addr_loopback; addr6.sin6_port = 0; - server = start_server((const struct sockaddr *)&addr4, sizeof(addr4)); - if (server == -1) + memset(&addr6dual, 0, sizeof(addr6dual)); + addr6dual.sin6_family = AF_INET6; + addr6dual.sin6_addr = in6addr_any; + addr6dual.sin6_port = 0; + + server = start_server((const struct sockaddr *)&addr4, sizeof(addr4), + false); + if (server == -1 || !get_port(server, &addr4.sin_port)) goto err; server_v6 = start_server((const struct sockaddr *)&addr6, - sizeof(addr6)); - if (server_v6 == -1) + sizeof(addr6), false); + if (server_v6 == -1 || !get_port(server_v6, &addr6.sin6_port)) + goto err; + + server_dual = start_server((const struct sockaddr *)&addr6dual, + sizeof(addr6dual), true); + if (server_dual == -1 || !get_port(server_dual, &addr4dual.sin_port)) + goto err; + + if (run_test(server, results, xdp, + (const struct sockaddr *)&addr4, sizeof(addr4))) goto err; - if (run_test(server, results, xdp)) + if (run_test(server_v6, results, xdp, + (const struct sockaddr *)&addr6, sizeof(addr6))) goto err; - if (run_test(server_v6, results, xdp)) + if (run_test(server_dual, results, xdp, + (const struct sockaddr *)&addr4dual, sizeof(addr4dual))) goto err; printf("ok\n"); @@ -252,6 +291,7 @@ int main(int argc, char **argv) out: close(server); close(server_v6); + close(server_dual); close(results); return err; }