From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f47.google.com (mail-wm1-f47.google.com [209.85.128.47]) (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 F3F173B4EB5 for ; Fri, 14 Aug 2026 19:29:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786735770; cv=none; b=fc4cIH6zR9r/8iGHnTFTya73qF9zwthOsWnH9qNYaH/yqkTh4d+lcPVlW7svgmceqqIYYmhGWiAoUJb+8PGxC1q+AjNfqpwSa/++wfx0fCYu73ATixK3NU08NAQjHUDumZnrQyBqLueLA+S13g6viV5e2pXFI1mWQGBcQEqBDOA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786735770; c=relaxed/simple; bh=GhZD17cuw5gYUVnyHmaSI6jBf22mSnRirzc/2LtRvPA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=RuEtnDZOTGBL7Opao8RP41PJ/emkUpCe1xDt+GXZ5ilKvLrtZ6Z6Eh6PCgDH5s5upNVCnZaoBfNdJYRfDAuPSrgkmwaitzwtqsqbZwSAvleuqt+SEeABD0l3y/EQCeDep+uPc8IKtqGNh1i4/XoLsHL368kmCFp/Ua6yp4NfoSk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=QOPsqEvR; arc=none smtp.client-ip=209.85.128.47 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="QOPsqEvR" Received: by mail-wm1-f47.google.com with SMTP id 5b1f17b1804b1-495502852d1so782465e9.2 for ; Fri, 14 Aug 2026 12:29:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1786735763; x=1787340563; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=ECtMwAmDF1K5nODesCePL78MgfJUPMGWesJDcm6OOPY=; b=QOPsqEvRJFzQUX9vjFED9pbpo1XrEuAIvh0I+Nz/3aduc2wa6PzhB/ncpoHNXXgLGv 5W2KAnz8/XunoXxScZQmfVGRKqXukI463JdBNhTVMdzB0X/gp52r/YlM8DjNXki+8Egk dBA5pwn9/1wsrG4vUQ9LjZkvEv06+IUdAfgxlQlzCuzVRGbTzR6HGAYE5VdwAgKL8Yl8 844B5Fw58gCetE3bW6863HtZnXh7VCPrpZjf6FTIbYwQmnmvcZbbabGNNRLKSXlvThAi jG/wrn8qt8x84l7RE+YpsC9HlTHP7OZYqVBTmfMt0lA2xDE8v21O3N+mSnamROnSIY84 zwCg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786735763; x=1787340563; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=ECtMwAmDF1K5nODesCePL78MgfJUPMGWesJDcm6OOPY=; b=agdqlscFz75A5LYWJC0sSiCNtMSP7vXotzfezxHGCC9fxw+kXXXHtGfJ0mLLsRKqjn R2RvNvWxY0zAhd0H128OqItYAGXgfhlVYShHAKFrLy2b9U+2n4iKB3ET6XfjqANCo9Zm sg40n1RhYlbuXypfDZsVpIxztZZD90zRasI/Ho2ue3HS+PaAYoafMRuYWWZOjF8aPwu5 tpSFrVORMltkVfO7+Lw6xOS7tNAbxYLN6Ben35JX47992bWE8ApnkPtxHz+3W1uZvuX4 XbIPkmy2roWe5wr+4diUqfxwjpj22ZRUX8NJsnfTDjSYaV7zGFKhBYfo46bBOmWF1Mft tetQ== X-Forwarded-Encrypted: i=1; AHgh+RqSbsVleKS74JUV/zETNTXei/6HWr50KZI50WqzPM4koad2dPBzTCBHwygT2JEOWch0H1cTlCg=@vger.kernel.org X-Gm-Message-State: AOJu0Yw+XCn4FGlnttznIgApceVEiN8voXnblsoJI5SsV2pVxzMw5Nac fQ3YJv9QXRgyCaLEh2sMqShccFSI4fXv0wqATzbKIKjU/AtCDCZNlMcv X-Gm-Gg: AR+sD11XmGBfmifMYA2qEqzmbhsKFPAuWUH+utpZ8Ggm7wT/0NMB8yQl5JGLYZfsqmL +8qTxVSpRgA3hBAcqgGGHwpG0zf34WZ3Wn7JT/sDSdKqFzt2FB3g8IPpTY6lqnPBsJ+2xcT2pOl JF+oHqrjKmtEf+D8IXrDnaty0MGm9gAIgXYO1Z7uqyWdjMbI/lp4k3uwYsTGInfgT9xz/Eo0gAC OC0Rp6a2C3/h3fpLQ4VXXVU+vBczFjbs2ICA/9gWvelUrpLNYZrpWh4sk1MxlKUMJHXTyOKYARY ryS49n6cqQgLo6zqZp+2/H5hXPF3uZ7kj/rChHrfCK4f9X423RtXonABo8NzSj4WN+J9jWq5RkF z+ruUJd7c9Xgy8OeaC5jLt+zpLEjvITSbLApJ363hBb1may5LBvgRaBmw72BrMfWfdPL/LXc/2o 5872VQ9PsNKYotON1w697EWdRdE65QgCtzV7snV7w1eDA= X-Received: by 2002:a05:600c:3b1f:b0:490:ec79:3046 with SMTP id 5b1f17b1804b1-499878d463cmr57282875e9.0.1786735763094; Fri, 14 Aug 2026 12:29:23 -0700 (PDT) Received: from localhost ([2620:10d:c092:500::4:391e]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49988b2a509sm73702315e9.14.2026.08.14.12.29.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Aug 2026 12:29:22 -0700 (PDT) From: Gustavo Luiz Duarte Date: Fri, 14 Aug 2026 20:28:53 +0100 Subject: [PATCH net-next v3 2/7] netconsole: use the address family instead of the ipv6 flag Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260814-netcons_ipv6-v3-2-bc0915e8c75f@gmail.com> References: <20260814-netcons_ipv6-v3-0-bc0915e8c75f@gmail.com> In-Reply-To: <20260814-netcons_ipv6-v3-0-bc0915e8c75f@gmail.com> To: Breno Leitao , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Jonathan Corbet , Shuah Khan Cc: Gustavo Luiz Duarte , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org X-Mailer: b4 0.15.2 Now that we have the address family in inet_addr, use that and remove nt->ipv6. We no longer need netcons_local_ip_unset() to check that all bytes are zeroes, as that is now denoted by (family == AF_UNSPEC). Reviewed-by: Breno Leitao Signed-off-by: Gustavo Luiz Duarte --- drivers/net/netconsole.c | 82 ++++++++++++++---------------------------------- 1 file changed, 23 insertions(+), 59 deletions(-) diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 432b66cf111a..351754d53cf9 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -195,7 +195,6 @@ struct netcons_userdata { * local_mac (read-only) * @local_ip: Source IP address of the target (read-write). * @remote_ip: Destination IP address of the target (read-write). - * @ipv6: Whether the target addresses are IPv6 (read-write). * @local_port: Source UDP port of the target (read-write). * @remote_port: Destination UDP port of the target (read-write). * @remote_mac: Destination ethernet address of the target (read-write). @@ -226,7 +225,6 @@ struct netconsole_target { bool release; struct netpoll np; struct inet_addr local_ip, remote_ip; - bool ipv6; u16 local_port, remote_port; u8 remote_mac[ETH_ALEN]; /* protected by target_list_lock; +1 gives scnprintf() room for its @@ -476,23 +474,6 @@ static int netcons_take_ipv4(struct netconsole_target *nt, return 0; } -/* - * Test whether the caller left nt->local_ip unset, so that - * netcons_netpoll_setup() should auto-populate it from the egress device. - * - * nt->local_ip is a union of __be32 (IPv4) and struct in6_addr (IPv6), - * so an IPv6 address whose first 4 bytes are zero (e.g. ::1, ::2, - * IPv4-mapped ::ffff:a.b.c.d) must not be tested via the IPv4 arm — - * doing so would misclassify a caller-supplied address as unset and - * silently overwrite it with whatever address the device exposes. - */ -static bool netcons_local_ip_unset(const struct netconsole_target *nt) -{ - if (nt->ipv6) - return ipv6_addr_any(&nt->local_ip.in6); - return !nt->local_ip.ip; -} - static int netcons_netpoll_setup(struct netconsole_target *nt) { struct net *net = current->nsproxy->net_ns; @@ -538,16 +519,13 @@ static int netcons_netpoll_setup(struct netconsole_target *nt) rtnl_lock(); } - if (netcons_local_ip_unset(nt)) { - if (!nt->ipv6) { - err = netcons_take_ipv4(nt, ndev); - if (err) - goto put; - } else { + if (nt->local_ip.family == AF_UNSPEC) { + if (nt->remote_ip.family == AF_INET6) err = netcons_take_ipv6(nt, ndev); - if (err) - goto put; - } + else + err = netcons_take_ipv4(nt, ndev); + if (err) + goto put; ip_overwritten = true; } @@ -729,22 +707,22 @@ static void netconsole_print_banner(struct netconsole_target *nt) struct netpoll *np = &nt->np; np_info(np, "local port %d\n", nt->local_port); - if (nt->ipv6) + if (nt->local_ip.family == AF_INET6) np_info(np, "local IPv6 address %pI6c\n", &nt->local_ip.in6); else np_info(np, "local IPv4 address %pI4\n", &nt->local_ip.ip); np_info(np, "interface name '%s'\n", np->dev_name); np_info(np, "local ethernet address '%pM'\n", np->dev_mac); np_info(np, "remote port %d\n", nt->remote_port); - if (nt->ipv6) + if (nt->remote_ip.family == AF_INET6) np_info(np, "remote IPv6 address %pI6c\n", &nt->remote_ip.in6); else np_info(np, "remote IPv4 address %pI4\n", &nt->remote_ip.ip); np_info(np, "remote ethernet address %pM\n", nt->remote_mac); } -/* Parse the string and populate the `inet_addr` struct. Return 0 if IPv4 is - * populated, 1 if IPv6 is populated, and -1 upon failure. +/* Parse the string and populate the `inet_addr` struct. Return 0 on success + * and -1 upon failure. */ static int netpoll_parse_ip_addr(const char *str, struct inet_addr *addr) { @@ -768,7 +746,7 @@ static int netpoll_parse_ip_addr(const char *str, struct inet_addr *addr) in6_pton(str, len, (void *)&addr->in6, -1, &end) > 0 && (!end || *end == 0 || *end == '\n')) { addr->family = AF_INET6; - return 1; + return 0; } return -1; @@ -874,7 +852,7 @@ static ssize_t local_ip_show(struct config_item *item, char *buf) { struct netconsole_target *nt = to_target(item); - if (nt->ipv6) + if (nt->local_ip.family == AF_INET6) return sysfs_emit(buf, "%pI6c\n", &nt->local_ip.in6); else return sysfs_emit(buf, "%pI4\n", &nt->local_ip.ip); @@ -884,7 +862,7 @@ static ssize_t remote_ip_show(struct config_item *item, char *buf) { struct netconsole_target *nt = to_target(item); - if (nt->ipv6) + if (nt->remote_ip.family == AF_INET6) return sysfs_emit(buf, "%pI6c\n", &nt->remote_ip.in6); else return sysfs_emit(buf, "%pI4\n", &nt->remote_ip.ip); @@ -1232,7 +1210,6 @@ static ssize_t local_ip_store(struct config_item *item, const char *buf, { struct netconsole_target *nt = to_target(item); ssize_t ret = -EINVAL; - int ipv6; dynamic_netconsole_mutex_lock(); if (nt->state == STATE_ENABLED) { @@ -1241,10 +1218,8 @@ static ssize_t local_ip_store(struct config_item *item, const char *buf, goto out_unlock; } - ipv6 = netpoll_parse_ip_addr(buf, &nt->local_ip); - if (ipv6 == -1) + if (netpoll_parse_ip_addr(buf, &nt->local_ip) < 0) goto out_unlock; - nt->ipv6 = !!ipv6; ret = count; out_unlock: @@ -1257,7 +1232,6 @@ static ssize_t remote_ip_store(struct config_item *item, const char *buf, { struct netconsole_target *nt = to_target(item); ssize_t ret = -EINVAL; - int ipv6; dynamic_netconsole_mutex_lock(); if (nt->state == STATE_ENABLED) { @@ -1266,10 +1240,8 @@ static ssize_t remote_ip_store(struct config_item *item, const char *buf, goto out_unlock; } - ipv6 = netpoll_parse_ip_addr(buf, &nt->remote_ip); - if (ipv6 == -1) + if (netpoll_parse_ip_addr(buf, &nt->remote_ip) < 0) goto out_unlock; - nt->ipv6 = !!ipv6; ret = count; out_unlock: @@ -2078,7 +2050,7 @@ static void netpoll_udp_checksum(struct netconsole_target *nt, /* check needs to be set, since it will be consumed in csum_partial */ udph->check = 0; - if (nt->ipv6) + if (nt->remote_ip.family == AF_INET6) udph->check = csum_ipv6_magic(&nt->local_ip.in6, &nt->remote_ip.in6, udp_len, IPPROTO_UDP, @@ -2119,7 +2091,7 @@ static void push_eth(struct netconsole_target *nt, struct sk_buff *skb) skb_reset_mac_header(skb); ether_addr_copy(eth->h_source, np->dev->dev_addr); ether_addr_copy(eth->h_dest, nt->remote_mac); - if (nt->ipv6) + if (nt->remote_ip.family == AF_INET6) eth->h_proto = htons(ETH_P_IPV6); else eth->h_proto = htons(ETH_P_IP); @@ -2188,7 +2160,7 @@ static int netpoll_send_udp(struct netconsole_target *nt, const char *msg, WARN_ON_ONCE(!irqs_disabled()); udp_len = len + sizeof(struct udphdr); - if (nt->ipv6) + if (nt->remote_ip.family == AF_INET6) ip_len = udp_len + sizeof(struct ipv6hdr); else ip_len = udp_len + sizeof(struct iphdr); @@ -2204,7 +2176,7 @@ static int netpoll_send_udp(struct netconsole_target *nt, const char *msg, skb_put(skb, len); push_udp(nt, skb, len); - if (nt->ipv6) + if (nt->remote_ip.family == AF_INET6) push_ipv6(nt, skb, len); else push_ipv4(nt, skb, len); @@ -2533,10 +2505,8 @@ __releases(&target_list_lock) static int netconsole_parser_cmdline(struct netconsole_target *nt, char *opt) { struct netpoll *np = &nt->np; - bool ipversion_set = false; char *cur = opt; char *delim; - int ipv6; if (*cur != '@') { delim = strchr(cur, '@'); @@ -2550,16 +2520,12 @@ static int netconsole_parser_cmdline(struct netconsole_target *nt, char *opt) cur++; if (*cur != '/') { - ipversion_set = true; delim = strchr(cur, '/'); if (!delim) goto parse_failed; *delim = 0; - ipv6 = netpoll_parse_ip_addr(cur, &nt->local_ip); - if (ipv6 < 0) + if (netpoll_parse_ip_addr(cur, &nt->local_ip) < 0) goto parse_failed; - else - nt->ipv6 = (bool)ipv6; cur = delim; } cur++; @@ -2601,13 +2567,11 @@ static int netconsole_parser_cmdline(struct netconsole_target *nt, char *opt) if (!delim) goto parse_failed; *delim = 0; - ipv6 = netpoll_parse_ip_addr(cur, &nt->remote_ip); - if (ipv6 < 0) + if (netpoll_parse_ip_addr(cur, &nt->remote_ip) < 0) goto parse_failed; - else if (ipversion_set && nt->ipv6 != (bool)ipv6) + if (nt->local_ip.family != AF_UNSPEC && + nt->local_ip.family != nt->remote_ip.family) goto parse_failed; - else - nt->ipv6 = (bool)ipv6; cur = delim + 1; if (*cur != 0) { -- 2.55.0