From patchwork Thu Dec 21 18:58:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Gobert X-Patchwork-Id: 758333 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EDE266518D; Thu, 21 Dec 2023 18:59:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="lHqSD+RS" Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-40c339d2b88so11206565e9.3; Thu, 21 Dec 2023 10:59:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1703185169; x=1703789969; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:references:to:from:subject :mime-version:date:message-id:from:to:cc:subject:date:message-id :reply-to; bh=prT5zhWN3Xwvhx/dTTcm4J0NQjHP/BjQ2cfs9rXhsKs=; b=lHqSD+RSsDjFxrJEMe6Qoe0zxcgBrD8zkmFqYW2ePmh1XtshVem307PtC0MQTXorx7 U86y1TFVtneYga/IBKShDqaEuwSPrDMC6hAFRC/XHPOxnZy3ccUUXfCX0LPtiUiTVbef N/QrKNyKvH+POorpXyer4+0kO109HKNfNHAow5jog92QlImDbjlhQDt9mpGlO/pcNYOB fH08xKdweRr/Hw1IpzNvAq70R9Aqh5yvYQueazOVN3DDzoD+Hya2w61IutNPiQqeE5vc m5gra0d/KGRjD3FO1CTVRBISJ6itpbgmVf4jWX2hn1sncKj7H/9rEyn0ZX+aW+WtzpTY yMQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1703185169; x=1703789969; h=content-transfer-encoding:in-reply-to:references:to:from:subject :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=prT5zhWN3Xwvhx/dTTcm4J0NQjHP/BjQ2cfs9rXhsKs=; b=M8cY33Dm+uC+WieVo2jfP3FKC+DnHs9FMn94wwXSoHN4LZ+kOdDbNSv1gQqrE2qj1y aqhPc63ppSFL+i9YEAXlSbY2djkys47rJs9qxcAoz4RcT68y8l9cwDR5sli9jmzN5yRy rITspeehYoWPUQRwxttSjzyjNI0WslFymlrynOxfZKe9q98vE2R0/ajCP3DPp1cQTOrJ RNbR99nItDFxENyU6dhLK5tqPE4t8kHmFpvQpgCH+ExKMZyF8YglXJKsn+GQVUeuItti vw/XXofUVSET0ahN0PNY1jLdrMWN2b527NwYW3PxnS/SsYx5kPANwycnp8gadVsa4zcS CLXQ== X-Gm-Message-State: AOJu0Yxk94nxpJg7I/5yi9v20fDJBxdpuE9OIh4EOSE3RBnuVBbkx/uJ Pf29nkewFTQA0JuJJDANAd8= X-Google-Smtp-Source: AGHT+IGcfjzOQgIK3oE5a0xkZ7F3VXQnA2OqVx/WoldDgtxZW8s2O5rFIGVBr5oJ6hVqxbxAUbsFww== X-Received: by 2002:a05:600c:4f0f:b0:40c:2cc5:4539 with SMTP id l15-20020a05600c4f0f00b0040c2cc54539mr99103wmq.23.1703185168870; Thu, 21 Dec 2023 10:59:28 -0800 (PST) Received: from debian ([146.70.204.204]) by smtp.gmail.com with ESMTPSA id p6-20020a05600c468600b004053e9276easm11868269wmo.32.2023.12.21.10.59.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 Dec 2023 10:59:28 -0800 (PST) Message-ID: <641157c0-f224-4910-874d-7906a48d914b@gmail.com> Date: Thu, 21 Dec 2023 19:58:59 +0100 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: [PATCH net-next 3/3] selftests/net: fix GRO coalesce test and add ext From: Richard Gobert To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, shuah@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org References: In-Reply-To: Currently there is no test which checks that IPv6 extension header packets successfully coalesce. This commit adds a test, which verifies two IPv6 packets with HBH extension headers do coalesce. I changed the receive socket filter to accept a packet with one extension header. This change exposed a bug in the fragment test -- the old BPF did not accept the fragment packet. I updated correct_num_packets in the fragment test accordingly. Signed-off-by: Richard Gobert --- tools/testing/selftests/net/gro.c | 78 ++++++++++++++++++++++++++++--- 1 file changed, 71 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/net/gro.c b/tools/testing/selftests/net/gro.c index 30024d0ed373..4ee34dca8e5f 100644 --- a/tools/testing/selftests/net/gro.c +++ b/tools/testing/selftests/net/gro.c @@ -71,6 +71,10 @@ #define MAX_PAYLOAD (IP_MAXPACKET - sizeof(struct tcphdr) - sizeof(struct ipv6hdr)) #define NUM_LARGE_PKT (MAX_PAYLOAD / MSS) #define MAX_HDR_LEN (ETH_HLEN + sizeof(struct ipv6hdr) + sizeof(struct tcphdr)) +#define MIN_EXTHDR_SIZE 8 /* minimum size of IPv6 extension header */ + +#define ipv6_optlen(p) (((p)->hdrlen+1) << 3) /* calculate IPv6 extension header len */ + static const char *addr6_src = "fdaa::2"; static const char *addr6_dst = "fdaa::1"; @@ -104,7 +108,7 @@ static void setup_sock_filter(int fd) const int dport_off = tcp_offset + offsetof(struct tcphdr, dest); const int ethproto_off = offsetof(struct ethhdr, h_proto); int optlen = 0; - int ipproto_off; + int ipproto_off, opt_ipproto_off; int next_off; if (proto == PF_INET) @@ -116,14 +120,27 @@ static void setup_sock_filter(int fd) if (strcmp(testname, "ip") == 0) { if (proto == PF_INET) optlen = sizeof(struct ip_timestamp); - else - optlen = sizeof(struct ip6_frag); + else { + // same size for HBH and Fragment extension header types + optlen = MIN_EXTHDR_SIZE; + opt_ipproto_off = ETH_HLEN + sizeof(struct ipv6hdr) + + offsetof(struct ip6_ext, ip6e_nxt); + } } + /* + * this filter validates the following: + * - packet is IPv4/IPv6 according to the running test. + * - packet is TCP. Also handles the case of one extension header and then TCP. + * - checks the packet tcp dport equals to DPORT. + * (also handles the case of one extension header and then TCP.) + */ struct sock_filter filter[] = { BPF_STMT(BPF_LD + BPF_H + BPF_ABS, ethproto_off), - BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ntohs(ethhdr_proto), 0, 7), + BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ntohs(ethhdr_proto), 0, 9), BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ipproto_off), + BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_TCP, 2, 0), + BPF_STMT(BPF_LD + BPF_B + BPF_ABS, opt_ipproto_off), BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_TCP, 0, 5), BPF_STMT(BPF_LD + BPF_H + BPF_ABS, dport_off), BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DPORT, 2, 0), @@ -576,6 +593,39 @@ static void add_ipv4_ts_option(void *buf, void *optpkt) iph->check = checksum_fold(iph, sizeof(struct iphdr) + optlen, 0); } +static void add_ipv6_exthdr(void *buf, void *optpkt, __u8 exthdr_type) +{ + struct ipv6_opt_hdr *hbh_hdr = (struct ipv6_opt_hdr *)(optpkt + tcp_offset); + struct ipv6hdr *iph = (struct ipv6hdr *)(optpkt + ETH_HLEN); + int opt_len; + + hbh_hdr->hdrlen = 0; + hbh_hdr->nexthdr = IPPROTO_TCP; + opt_len = ipv6_optlen(hbh_hdr); + + memcpy(optpkt, buf, tcp_offset); + memcpy(optpkt + tcp_offset + MIN_EXTHDR_SIZE, buf + tcp_offset, + sizeof(struct tcphdr) + PAYLOAD_LEN); + + iph->nexthdr = exthdr_type; + iph->payload_len = htons(ntohs(iph->payload_len) + MIN_EXTHDR_SIZE); +} + +/* Send IPv6 packet with extension header */ +static void send_ipv6_exthdr(int fd, struct sockaddr_ll *daddr) +{ + static char buf[MAX_HDR_LEN + PAYLOAD_LEN]; + static char exthdr_pck[sizeof(buf) + MIN_EXTHDR_SIZE]; + + create_packet(buf, 0, 0, PAYLOAD_LEN, 0); + add_ipv6_exthdr(buf, exthdr_pck, IPPROTO_HOPOPTS); + write_packet(fd, exthdr_pck, total_hdr_len + PAYLOAD_LEN + MIN_EXTHDR_SIZE, daddr); + + create_packet(buf, PAYLOAD_LEN * 1, 0, PAYLOAD_LEN, 0); + add_ipv6_exthdr(buf, exthdr_pck, IPPROTO_HOPOPTS); + write_packet(fd, exthdr_pck, total_hdr_len + PAYLOAD_LEN + MIN_EXTHDR_SIZE, daddr); +} + /* IPv4 options shouldn't coalesce */ static void send_ip_options(int fd, struct sockaddr_ll *daddr) { @@ -697,7 +747,7 @@ static void send_fragment6(int fd, struct sockaddr_ll *daddr) create_packet(buf, PAYLOAD_LEN * i, 0, PAYLOAD_LEN, 0); write_packet(fd, buf, bufpkt_len, daddr); } - + sleep(1); create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0); memset(extpkt, 0, extpkt_len); @@ -760,6 +810,7 @@ static void check_recv_pkts(int fd, int *correct_payload, vlog("}, Total %d packets\nReceived {", correct_num_pkts); while (1) { + ip_ext_len = 0; pkt_size = recv(fd, buffer, IP_MAXPACKET + ETH_HLEN + 1, 0); if (pkt_size < 0) error(1, errno, "could not receive"); @@ -767,7 +818,7 @@ static void check_recv_pkts(int fd, int *correct_payload, if (iph->version == 4) ip_ext_len = (iph->ihl - 5) * 4; else if (ip6h->version == 6 && ip6h->nexthdr != IPPROTO_TCP) - ip_ext_len = sizeof(struct ip6_frag); + ip_ext_len = MIN_EXTHDR_SIZE; tcph = (struct tcphdr *)(buffer + tcp_offset + ip_ext_len); @@ -880,7 +931,14 @@ static void gro_sender(void) sleep(1); write_packet(txfd, fin_pkt, total_hdr_len, &daddr); } else if (proto == PF_INET6) { + sleep(1); send_fragment6(txfd, &daddr); + sleep(1); + write_packet(txfd, fin_pkt, total_hdr_len, &daddr); + + sleep(1); + send_ipv6_exthdr(txfd, &daddr); + sleep(1); write_packet(txfd, fin_pkt, total_hdr_len, &daddr); } } else if (strcmp(testname, "large") == 0) { @@ -997,7 +1055,13 @@ static void gro_receiver(void) */ printf("fragmented ip6 doesn't coalesce: "); correct_payload[0] = PAYLOAD_LEN * 2; - check_recv_pkts(rxfd, correct_payload, 2); + correct_payload[1] = PAYLOAD_LEN; + correct_payload[2] = PAYLOAD_LEN; + check_recv_pkts(rxfd, correct_payload, 3); + + correct_payload[0] = PAYLOAD_LEN * 2; + printf("ipv6 with extension header DOES coalesce: "); + check_recv_pkts(rxfd, correct_payload, 1); } } else if (strcmp(testname, "large") == 0) { int offset = proto == PF_INET ? 20 : 0;