From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794451197; b=Ij4BlPyD4RlrB23JUHOobwnDAvu6tEf3aiPonoz0SOcxghLwUU5GrPqd/A2K/owpEOFE 4kQawqZQ1QzhaD/7p/+yaHXd3PZpBZxgZ1aqiH6VRlcv4tYarRkarFLbIT4acY2nCTJRd lYmYboqZCfyScAdP+Lf1T0dmK6sayhmPlotTN32fPgR2OnU8Mfv5QubBCrOfmg2pTVVq1 OcjKScGS2dGZUlJ++ki8REi7lma+Aa7TdboAPIADTeqMpisQysD1yCgb7k+b8gXCj71Si AQeQ8NWL6BNtFEeaSwacCr1j84T9pqrPbIv3lxpHaErRmbdGucfTUmj9hrw4GGDkcNA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794451197; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=oWw3Dki61DbF+g+XlMox63UYqVQujnNueblDRi1gztw=; b=ogD/5PCCaYnUO7cFzkhaWsWINLGdbVDit1SE1/r5e47m5RKiDdWwdHxBVzjmbuAOfwtu atFtVrQnXwS8qNV++Q42V/qXIzEirVd6K5xj28jO5b4VKIN0+LoLFWO2EtpxkVdNofd3l juuti1HKZFDMd87qBR+3ydpbh3X5eO6fdnk2aYPUbFGRScCagosCDDjypg5zL6vNLbCXx e6d2n8t3fqGc9heAJju+zBPhGRRmvcWyRPcYKdHAzw/CpnklzaxDzLKV0owNk8TWVsoqg 1sZedfp6g300RlWhFUd+QcU7A+3WGKIXAAvZ98zCS9GDza5OLvIrZA9RpNy6gcPyYrw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=eUg3V5vU; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AA516606A31C for ; Thu, 12 Nov 2026 02:39:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=eUg3V5vU Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1238B1F00A05; Thu, 12 Nov 2026 02:39:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794451197; bh=oWw3Dki61DbF+g+XlMox63UYqVQujnNueblDRi1gztw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=eUg3V5vUzSqkbV3qbm5jDNwzKV1Y1nP9qj/KmfRWhVqixL7j3F0NN+AQGm2ufaMPo Z4+wWyZhP0qAQtrl7G/k9+g0KXqAe/cy76FSzcrQ0Z7jYqVNZdSw35SVeKLOR7o9My etk0hGWOyZ3Wk5Z5JWsRcnTYh4/eePLAbDmH7OaP/cszmW/kM9ud4pGFznVi6tOCGz 2SMnvLH+Y0X1sj6nOA4SEceLRpuoDIX8J81HpHfHiCuakQIhmuRLofjsatWN3NTRkQ cWOErtMzAYoToWm0Y14V/T9wRMoSYLwPDBeIIy5M/d/yb+FwGbifbwhbsnFnLd7P3c LpDZ/zBJErfoQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Ondrej Mosnacek , "David S. Miller" , Sasha Levin Subject: [PATCH 6.6.y 1/2] cipso: make cipso_v4_skbuff_delattr() fully remove the CIPSO options Date: Wed, 11 Nov 2026 21:39:54 -0500 Message-ID: <20261112023938.1396308-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261109201138-failed-6.6-1f1f8e8c5176@kernel.org> References: <20261109201138-failed-6.6-1f1f8e8c5176@kernel.org> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ondrej Mosnacek [ Upstream commit 89aa3619d141d6cfb6040a561aebb6d99d3e2285 ] As the comment in this function says, the code currently just clears the CIPSO part with IPOPT_NOP, rather than removing it completely and trimming the packet. The other cipso_v4_*_delattr() functions, however, do the proper removal and also calipso_skbuff_delattr() makes an effort to remove the CALIPSO options instead of replacing them with padding. Some routers treat IPv4 packets with anything (even NOPs) in the option header as a special case and take them through a slower processing path. Consequently, hardening guides such as STIG recommend to configure such routers to drop packets with non-empty IP option headers [1][2]. Thus, users might expect NetLabel to produce packets with minimal padding (or at least with no padding when no actual options are present). Implement the proper option removal to address this and to be closer to what the peer functions do. [1] https://www.stigviewer.com/stig/juniper_router_rtr/2019-09-27/finding/V-90937 [2] https://www.stigviewer.com/stig/cisco_ios_xe_router_rtr/2021-03-26/finding/V-217001 Signed-off-by: Ondrej Mosnacek Signed-off-by: David S. Miller Stable-dep-of: 1f1f8e8c5176 ("cipso: fix optlen corruption in cipso_v4_delopt()") Signed-off-by: Sasha Levin --- net/ipv4/cipso_ipv4.c | 79 +++++++++++++++++++++++++++++-------------- 1 file changed, 54 insertions(+), 25 deletions(-) diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c index 8daa6418e25a0..83f58bb82c867 100644 --- a/net/ipv4/cipso_ipv4.c +++ b/net/ipv4/cipso_ipv4.c @@ -1813,6 +1813,29 @@ static int cipso_v4_genopt(unsigned char *buf, u32 buf_len, return CIPSO_V4_HDR_LEN + ret_val; } +static int cipso_v4_get_actual_opt_len(const unsigned char *data, int len) +{ + int iter = 0, optlen = 0; + + /* determining the new total option length is tricky because of + * the padding necessary, the only thing i can think to do at + * this point is walk the options one-by-one, skipping the + * padding at the end to determine the actual option size and + * from there we can determine the new total option length + */ + while (iter < len) { + if (data[iter] == IPOPT_END) { + break; + } else if (data[iter] == IPOPT_NOP) { + iter++; + } else { + iter += data[iter + 1]; + optlen = iter; + } + } + return optlen; +} + /** * cipso_v4_sock_setattr - Add a CIPSO option to a socket * @sk: the socket @@ -1988,7 +2011,6 @@ static int cipso_v4_delopt(struct ip_options_rcu __rcu **opt_ptr) u8 cipso_len; u8 cipso_off; unsigned char *cipso_ptr; - int iter; int optlen_new; cipso_off = opt->opt.cipso - sizeof(struct iphdr); @@ -2008,23 +2030,8 @@ static int cipso_v4_delopt(struct ip_options_rcu __rcu **opt_ptr) memmove(cipso_ptr, cipso_ptr + cipso_len, opt->opt.optlen - cipso_off - cipso_len); - /* determining the new total option length is tricky because of - * the padding necessary, the only thing i can think to do at - * this point is walk the options one-by-one, skipping the - * padding at the end to determine the actual option size and - * from there we can determine the new total option length */ - iter = 0; - optlen_new = 0; - while (iter < opt->opt.optlen) { - if (opt->opt.__data[iter] == IPOPT_END) { - break; - } else if (opt->opt.__data[iter] == IPOPT_NOP) { - iter++; - } else { - iter += opt->opt.__data[iter + 1]; - optlen_new = iter; - } - } + optlen_new = cipso_v4_get_actual_opt_len(opt->opt.__data, + opt->opt.optlen); hdr_delta = opt->opt.optlen; opt->opt.optlen = (optlen_new + 3) & ~3; hdr_delta -= opt->opt.optlen; @@ -2244,7 +2251,8 @@ int cipso_v4_skbuff_setattr(struct sk_buff *skb, */ int cipso_v4_skbuff_delattr(struct sk_buff *skb) { - int ret_val; + int ret_val, cipso_len, hdr_len_actual, new_hdr_len_actual, new_hdr_len, + hdr_len_delta; struct iphdr *iph; struct ip_options *opt = &IPCB(skb)->opt; unsigned char *cipso_ptr; @@ -2257,16 +2265,37 @@ int cipso_v4_skbuff_delattr(struct sk_buff *skb) if (ret_val < 0) return ret_val; - /* the easiest thing to do is just replace the cipso option with noop - * options since we don't change the size of the packet, although we - * still need to recalculate the checksum */ - iph = ip_hdr(skb); cipso_ptr = (unsigned char *)iph + opt->cipso; - memset(cipso_ptr, IPOPT_NOOP, cipso_ptr[1]); + cipso_len = cipso_ptr[1]; + + hdr_len_actual = sizeof(struct iphdr) + + cipso_v4_get_actual_opt_len((unsigned char *)(iph + 1), + opt->optlen); + new_hdr_len_actual = hdr_len_actual - cipso_len; + new_hdr_len = (new_hdr_len_actual + 3) & ~3; + hdr_len_delta = (iph->ihl << 2) - new_hdr_len; + + /* 1. shift any options after CIPSO to the left */ + memmove(cipso_ptr, cipso_ptr + cipso_len, + new_hdr_len_actual - opt->cipso); + /* 2. move the whole IP header to its new place */ + memmove((unsigned char *)iph + hdr_len_delta, iph, new_hdr_len_actual); + /* 3. adjust the skb layout */ + skb_pull(skb, hdr_len_delta); + skb_reset_network_header(skb); + iph = ip_hdr(skb); + /* 4. re-fill new padding with IPOPT_END (may now be longer) */ + memset((unsigned char *)iph + new_hdr_len_actual, IPOPT_END, + new_hdr_len - new_hdr_len_actual); + + opt->optlen -= hdr_len_delta; opt->cipso = 0; opt->is_changed = 1; - + if (hdr_len_delta != 0) { + iph->ihl = new_hdr_len >> 2; + iph_set_totlen(iph, skb->len); + } ip_send_check(iph); return 0; -- 2.53.0