From mboxrd@z Thu Jan 1 00:00:00 1970 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 4170AC433EF for ; Thu, 23 Dec 2021 00:46:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238150AbhLWAqD (ORCPT ); Wed, 22 Dec 2021 19:46:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60496 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238131AbhLWAqC (ORCPT ); Wed, 22 Dec 2021 19:46:02 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B43AEC06173F for ; Wed, 22 Dec 2021 16:46:02 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id b15-20020a25ae8f000000b005c20f367790so7207832ybj.2 for ; Wed, 22 Dec 2021 16:46:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=IaZ4c/YqOfXqUxxQLSFcG1Ic/BQxO8upMj6Y2D5CqKI=; b=EM/q7rVWGpaJYUxzMY1mrHbYJkxCV/ZMut+cwIEvIDCB0T2FDnhcTWNOx1K2919jKt yZbp1uQFfKwbyXfTom87IUGDb0oeR86B0GoQ7cqpS2OvIRs+NYr8JqSnjAPXsKVj333V uBmuTsj7Hyl/iTKErfQlg4ZTtg67o4PUBSzkrCmOG57BrSyBh/ZuggxSWvWRdSweR5wL eP7ReZ9wTyLp+GLU2nnfgutZnLiK2NzW37aW98HGpZFTjkkmMNF3IoCbLolCuTEksfRB 39Oth3+9t+W5pudwlHoEGw2PHBlRfJ6gSAJ5mOCkVZn1C6wcb6x0wN+5jURBvANY/KLJ 2wQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=IaZ4c/YqOfXqUxxQLSFcG1Ic/BQxO8upMj6Y2D5CqKI=; b=X2B2CG6esbU3mEaKu43UeBiWINLP24KaFWGWjqn5ty33bPvSLOt5NLw9uOyjXnpK/x /v1oXaNrn4vvr7aaIGE/UZof1dxO3ItghuxX2zu6xvqFfoGE8em82E/mEAZQ0BDfrZDE jBkuf42zKeQ/Gi7PpuNKMqvbVYOKQlHRqQcq5ySnioRV2RoHcudOeqy9mtqI0Fa+Hg6e xqhTSSZHwq2ymJkm9MCms9e9CWqCJp33EAnaaLgF/O+gpI8uXL9gca6rb+RYX8f3+wXZ qH5ng9T3oNdhyTVN69R1rN1JO/TMgBFT5DuUleXoyMIw/gtXJLqZvmp5DdlAfmJeUP1K +QJA== X-Gm-Message-State: AOAM532rh4xSELSlc0zpsdRRnyhCBR+k7OtOxO/14HbX5YPavs/qSEDI 5/E3tyqxJDo4FHM8MOAEW49z+QyRYef2sA== X-Google-Smtp-Source: ABdhPJykY35aMK5sPDASUeRkT8FM5/nNwMuaWHQoaGpn3ttYiFWfazV9FahXpMS2YSE3xYTtxKVrNh/CxSAYYw== X-Received: from evitayan.mtv.corp.google.com ([2620:0:1000:5711:78f5:9c84:70bc:be20]) (user=evitayan job=sendgmr) by 2002:a25:a2c1:: with SMTP id c1mr209089ybn.473.1640220361962; Wed, 22 Dec 2021 16:46:01 -0800 (PST) Date: Wed, 22 Dec 2021 16:45:54 -0800 In-Reply-To: <20211223004555.1284666-1-evitayan@google.com> Message-Id: <20211223004555.1284666-2-evitayan@google.com> Mime-Version: 1.0 References: <20211223004555.1284666-1-evitayan@google.com> X-Mailer: git-send-email 2.34.1.307.g9b7440fafd-goog Subject: [PATCH v1 1/2] xfrm: Check if_id in xfrm_migrate From: Yan Yan To: steffen.klassert@secunet.com Cc: herbert@gondor.apana.org.au, davem@davemloft.net, netdev@vger.kernel.org, nharold@google.com, benedictwong@google.com, maze@google.com, lorenzo@google.com, Yan Yan Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patch enables distinguishing SAs and SPs based on if_id during the xfrm_migrate flow. This ensures support for xfrm interfaces throughout the SA/SP lifecycle. When there are multiple existing SPs with the same direction, the same xfrm_selector and different endpoint addresses, xfrm_migrate might fail with ENODATA. Specifically, the code path for performing xfrm_migrate is: Stage 1: find policy to migrate with xfrm_migrate_policy_find(sel, dir, type, net) Stage 2: find and update state(s) with xfrm_migrate_state_find(mp, net) Stage 3: update endpoint address(es) of template(s) with xfrm_policy_migrate(pol, m, num_migrate) Currently "Stage 1" always returns the first xfrm_policy that matches, and "Stage 3" looks for the xfrm_tmpl that matches the old endpoint address. Thus if there are multiple xfrm_policy with same selector, direction, type and net, "Stage 1" might rertun a wrong xfrm_policy and "Stage 3" will fail with ENODATA because it cannot find a xfrm_tmpl with the matching endpoint address. The fix is to allow userspace to pass an if_id and add if_id to the matching rule in Stage 1 and Stage 2 since if_id is a unique ID for xfrm_policy and xfrm_state. For compatibility, if_id will only be checked if the attribute is set. Tested with additions to Android's kernel unit test suite: https://android-review.googlesource.com/c/kernel/tests/+/1668886 Signed-off-by: Yan Yan --- include/net/xfrm.h | 5 +++-- net/xfrm/xfrm_policy.c | 14 ++++++++------ net/xfrm/xfrm_state.c | 7 ++++++- net/xfrm/xfrm_user.c | 6 +++++- 4 files changed, 22 insertions(+), 10 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 2308210793a0..4fdd0c44b705 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -1675,14 +1675,15 @@ int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, const struct xfrm_migrate *m, int num_bundles, const struct xfrm_kmaddress *k, const struct xfrm_encap_tmpl *encap); -struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net); +struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, + u32 if_id); struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, struct xfrm_migrate *m, struct xfrm_encap_tmpl *encap); int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k, struct net *net, - struct xfrm_encap_tmpl *encap); + struct xfrm_encap_tmpl *encap, u32 if_id); #endif int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport); diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 1a06585022ab..cd656b4ec5b9 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -4235,7 +4235,7 @@ static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, } static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel, - u8 dir, u8 type, struct net *net) + u8 dir, u8 type, struct net *net, u32 if_id) { struct xfrm_policy *pol, *ret = NULL; struct hlist_head *chain; @@ -4244,7 +4244,8 @@ static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector * spin_lock_bh(&net->xfrm.xfrm_policy_lock); chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); hlist_for_each_entry(pol, chain, bydst) { - if (xfrm_migrate_selector_match(sel, &pol->selector) && + if ((if_id == 0 || pol->if_id == if_id) && + xfrm_migrate_selector_match(sel, &pol->selector) && pol->type == type) { ret = pol; priority = ret->priority; @@ -4256,7 +4257,8 @@ static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector * if ((pol->priority >= priority) && ret) break; - if (xfrm_migrate_selector_match(sel, &pol->selector) && + if ((if_id == 0 || pol->if_id == if_id) && + xfrm_migrate_selector_match(sel, &pol->selector) && pol->type == type) { ret = pol; break; @@ -4372,7 +4374,7 @@ static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_migrate, struct xfrm_kmaddress *k, struct net *net, - struct xfrm_encap_tmpl *encap) + struct xfrm_encap_tmpl *encap, u32 if_id) { int i, err, nx_cur = 0, nx_new = 0; struct xfrm_policy *pol = NULL; @@ -4391,14 +4393,14 @@ int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, } /* Stage 1 - find policy */ - if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) { + if ((pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id)) == NULL) { err = -ENOENT; goto out; } /* Stage 2 - find and update state(s) */ for (i = 0, mp = m; i < num_migrate; i++, mp++) { - if ((x = xfrm_migrate_state_find(mp, net))) { + if (x = xfrm_migrate_state_find(mp, net, if_id)) { x_cur[nx_cur] = x; nx_cur++; xc = xfrm_state_migrate(x, mp, encap); diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index a2f4001221d1..74d4283ed282 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -1602,7 +1602,8 @@ static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, return NULL; } -struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net) +struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, + u32 if_id) { unsigned int h; struct xfrm_state *x = NULL; @@ -1618,6 +1619,8 @@ struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *n continue; if (m->reqid && x->props.reqid != m->reqid) continue; + if (if_id != 0 && x->if_id != if_id) + continue; if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, m->old_family) || !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, @@ -1633,6 +1636,8 @@ struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *n if (x->props.mode != m->mode || x->id.proto != m->proto) continue; + if (if_id != 0 && x->if_id != if_id) + continue; if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, m->old_family) || !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 7c36cc1f3d79..8cbbe8107543 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -2579,6 +2579,7 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, int n = 0; struct net *net = sock_net(skb->sk); struct xfrm_encap_tmpl *encap = NULL; + u32 if_id = 0; if (attrs[XFRMA_MIGRATE] == NULL) return -EINVAL; @@ -2603,7 +2604,10 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, return -ENOMEM; } - err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap); + if (attrs[XFRMA_IF_ID]) + if_id = nla_get_u32(attrs[XFRMA_IF_ID]); + + err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, if_id); kfree(encap); -- 2.34.1.307.g9b7440fafd-goog