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{
    "id": 2227074,
    "url": "http://patchwork.ozlabs.org/api/1.1/patches/2227074/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260423072155.352333-1-pablo@netfilter.org/",
    "project": {
        "id": 26,
        "url": "http://patchwork.ozlabs.org/api/1.1/projects/26/?format=api",
        "name": "Netfilter Development",
        "link_name": "netfilter-devel",
        "list_id": "netfilter-devel.vger.kernel.org",
        "list_email": "netfilter-devel@vger.kernel.org",
        "web_url": null,
        "scm_url": null,
        "webscm_url": null
    },
    "msgid": "<20260423072155.352333-1-pablo@netfilter.org>",
    "date": "2026-04-23T07:21:53",
    "name": "[nf,v4,1/3] netfilter: replace skb_try_make_writable() by skb_ensure_writable()",
    "commit_ref": null,
    "pull_url": null,
    "state": "changes-requested",
    "archived": false,
    "hash": "c3281a270636241f67c06af26678734bf7e0171c",
    "submitter": {
        "id": 1315,
        "url": "http://patchwork.ozlabs.org/api/1.1/people/1315/?format=api",
        "name": "Pablo Neira Ayuso",
        "email": "pablo@netfilter.org"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260423072155.352333-1-pablo@netfilter.org/mbox/",
    "series": [
        {
            "id": 501153,
            "url": "http://patchwork.ozlabs.org/api/1.1/series/501153/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=501153",
            "date": "2026-04-23T07:21:54",
            "name": "[nf,v4,1/3] netfilter: replace skb_try_make_writable() by skb_ensure_writable()",
            "version": 4,
            "mbox": "http://patchwork.ozlabs.org/series/501153/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2227074/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2227074/checks/",
    "tags": {},
    "headers": {
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        "From": "Pablo Neira Ayuso <pablo@netfilter.org>",
        "To": "netfilter-devel@vger.kernel.org",
        "Subject": "[PATCH nf,v4 1/3] netfilter: replace skb_try_make_writable() by\n skb_ensure_writable()",
        "Date": "Thu, 23 Apr 2026 09:21:53 +0200",
        "Message-ID": "<20260423072155.352333-1-pablo@netfilter.org>",
        "X-Mailer": "git-send-email 2.47.3",
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        "X-Mailing-List": "netfilter-devel@vger.kernel.org",
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        "List-Unsubscribe": "<mailto:netfilter-devel+unsubscribe@vger.kernel.org>",
        "MIME-Version": "1.0",
        "Content-Transfer-Encoding": "8bit"
    },
    "content": "skb_try_make_writable() only works on clones and uncloned packets might\nhave their network header in paged fragments.\n\nnft_fwd needs to work for the ingress and egress hooks, but the egress\nhook where skb->data points to the mac header, use skb_network_offset()\nto include the mac header. The flowtable is fine since it already uses\nthe transport offset.\n\nFixes: d32de98ea70f (\"netfilter: nft_fwd_netdev: allow to forward packets via neighbour layer\")\nFixes: 7d2086871762 (\"netfilter: nf_flow_table: move ipv4 offload hook code to nf_flow_table\")\nSigned-off-by: Pablo Neira Ayuso <pablo@netfilter.org>\n---\nv4: no changes.\n\n net/netfilter/nf_flow_table_ip.c | 4 ++--\n net/netfilter/nft_fwd_netdev.c   | 5 +++--\n 2 files changed, 5 insertions(+), 4 deletions(-)",
    "diff": "diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c\nindex fd56d663cb5b..dbd7644fdbeb 100644\n--- a/net/netfilter/nf_flow_table_ip.c\n+++ b/net/netfilter/nf_flow_table_ip.c\n@@ -524,7 +524,7 @@ static int nf_flow_offload_forward(struct nf_flowtable_ctx *ctx,\n \t\treturn 0;\n \t}\n \n-\tif (skb_try_make_writable(skb, thoff + ctx->hdrsize))\n+\tif (skb_ensure_writable(skb, thoff + ctx->hdrsize))\n \t\treturn -1;\n \n \tflow_offload_refresh(flow_table, flow, false);\n@@ -1037,7 +1037,7 @@ static int nf_flow_offload_ipv6_forward(struct nf_flowtable_ctx *ctx,\n \t\treturn 0;\n \t}\n \n-\tif (skb_try_make_writable(skb, thoff + ctx->hdrsize))\n+\tif (skb_ensure_writable(skb, thoff + ctx->hdrsize))\n \t\treturn -1;\n \n \tflow_offload_refresh(flow_table, flow, false);\ndiff --git a/net/netfilter/nft_fwd_netdev.c b/net/netfilter/nft_fwd_netdev.c\nindex 4bce36c3a6a0..2cc809303ce8 100644\n--- a/net/netfilter/nft_fwd_netdev.c\n+++ b/net/netfilter/nft_fwd_netdev.c\n@@ -100,6 +100,7 @@ static void nft_fwd_neigh_eval(const struct nft_expr *expr,\n \tint oif = regs->data[priv->sreg_dev];\n \tunsigned int verdict = NF_STOLEN;\n \tstruct sk_buff *skb = pkt->skb;\n+\tint nhoff = skb_network_offset(skb);\n \tstruct net_device *dev;\n \tint neigh_table;\n \n@@ -111,7 +112,7 @@ static void nft_fwd_neigh_eval(const struct nft_expr *expr,\n \t\t\tverdict = NFT_BREAK;\n \t\t\tgoto out;\n \t\t}\n-\t\tif (skb_try_make_writable(skb, sizeof(*iph))) {\n+\t\tif (skb_ensure_writable(skb, nhoff + sizeof(*iph))) {\n \t\t\tverdict = NF_DROP;\n \t\t\tgoto out;\n \t\t}\n@@ -132,7 +133,7 @@ static void nft_fwd_neigh_eval(const struct nft_expr *expr,\n \t\t\tverdict = NFT_BREAK;\n \t\t\tgoto out;\n \t\t}\n-\t\tif (skb_try_make_writable(skb, sizeof(*ip6h))) {\n+\t\tif (skb_ensure_writable(skb, nhoff + sizeof(*ip6h))) {\n \t\t\tverdict = NF_DROP;\n \t\t\tgoto out;\n \t\t}\n",
    "prefixes": [
        "nf",
        "v4",
        "1/3"
    ]
}