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Message-ID: <a0db4efa-2328-4935-9eb6-3344fcbc4b07@gmail.com>
Date: Mon, 14 Oct 2024 20:34:07 +0200
From: Eric Woudstra <ericwouds@...il.com>
To: Nikolay Aleksandrov <razor@...ckwall.org>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>, Roopa Prabhu <roopa@...dia.com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
Jiri Pirko <jiri@...nulli.us>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Frank Wunderlich <frank-w@...lic-files.de>,
Daniel Golle <daniel@...rotopia.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
netfilter-devel@...r.kernel.org, coreteam@...filter.org,
bridge@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC v1 net-next 06/12] net: core: dev: Add
dev_fill_bridge_path()
On 10/14/24 8:59 AM, Nikolay Aleksandrov wrote:
> On 13/10/2024 21:55, Eric Woudstra wrote:
>> New function dev_fill_bridge_path(), similar to dev_fill_forward_path().
>> It handles starting from a bridge port instead of the bridge master.
>> The structures ctx and nft_forward_info need to be already filled in with
>> the (vlan) encaps.
>>
>> Signed-off-by: Eric Woudstra <ericwouds@...il.com>
>> ---
>> include/linux/netdevice.h | 2 +
>> net/core/dev.c | 77 ++++++++++++++++++++++++++++++++-------
>> 2 files changed, 66 insertions(+), 13 deletions(-)
>>
>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>> index e87b5e488325..9d80f650345e 100644
>> --- a/include/linux/netdevice.h
>> +++ b/include/linux/netdevice.h
>> @@ -3069,6 +3069,8 @@ void dev_remove_offload(struct packet_offload *po);
>>
>> int dev_get_iflink(const struct net_device *dev);
>> int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb);
>> +int dev_fill_bridge_path(struct net_device_path_ctx *ctx,
>> + struct net_device_path_stack *stack);
>> int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr,
>> struct net_device_path_stack *stack);
>> struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index cd479f5f22f6..49959c4904fc 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -713,44 +713,95 @@ static struct net_device_path *dev_fwd_path(struct net_device_path_stack *stack)
>> return &stack->path[k];
>> }
>>
>> -int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr,
>> - struct net_device_path_stack *stack)
>> +static int dev_fill_forward_path_common(struct net_device_path_ctx *ctx,
>> + struct net_device_path_stack *stack)
>> {
>> const struct net_device *last_dev;
>> - struct net_device_path_ctx ctx = {
>> - .dev = dev,
>> - };
>> struct net_device_path *path;
>> int ret = 0;
>>
>> - memcpy(ctx.daddr, daddr, sizeof(ctx.daddr));
>> - stack->num_paths = 0;
>> - while (ctx.dev && ctx.dev->netdev_ops->ndo_fill_forward_path) {
>> - last_dev = ctx.dev;
>> + while (ctx->dev && ctx->dev->netdev_ops->ndo_fill_forward_path) {
>> + last_dev = ctx->dev;
>> path = dev_fwd_path(stack);
>> if (!path)
>> return -1;
>>
>> memset(path, 0, sizeof(struct net_device_path));
>> - ret = ctx.dev->netdev_ops->ndo_fill_forward_path(&ctx, path);
>> + ret = ctx->dev->netdev_ops->ndo_fill_forward_path(ctx, path);
>> if (ret < 0)
>> return -1;
>>
>> - if (WARN_ON_ONCE(last_dev == ctx.dev))
>> + if (WARN_ON_ONCE(last_dev == ctx->dev))
>> return -1;
>> }
>>
>> - if (!ctx.dev)
>> + if (!ctx->dev)
>> return ret;
>>
>> path = dev_fwd_path(stack);
>> if (!path)
>> return -1;
>> path->type = DEV_PATH_ETHERNET;
>> - path->dev = ctx.dev;
>> + path->dev = ctx->dev;
>> +
>> + return ret;
>> +}
>> +
>> +int dev_fill_bridge_path(struct net_device_path_ctx *ctx,
>> + struct net_device_path_stack *stack)
>> +{
>> + const struct net_device *last_dev, *br_dev;
>> + struct net_device_path *path;
>> + int ret = 0;
>> +
>> + stack->num_paths = 0;
>> +
>> + if (!ctx->dev || !netif_is_bridge_port(ctx->dev))
>> + return -1;
>> +
>> + br_dev = netdev_master_upper_dev_get_rcu((struct net_device *)ctx->dev);
>> + if (!br_dev || !br_dev->netdev_ops->ndo_fill_forward_path)
>> + return -1;
>> +
>> + last_dev = ctx->dev;
>> + path = dev_fwd_path(stack);
>> + if (!path)
>> + return -1;
>> +
>> + memset(path, 0, sizeof(struct net_device_path));
>> + ret = br_dev->netdev_ops->ndo_fill_forward_path(ctx, path);
>> + if (ret < 0)
>> + return -1;
>> +
>> + if (!ctx->dev || WARN_ON_ONCE(last_dev == ctx->dev))
>> + return -1;
>> +
>> + if (!netif_is_bridge_master(ctx->dev))
>
> hmm, do we expect ctx->dev to be a bridge master? Looking at
> br_fill_forward_path, it seems to be == fdb->dst->dev which
> should be the target port
It would indeed be very unlikely. It was a left-over from code I wrote,
thinking that here I could handle cascaded bridges (via vlan-device). I
dropped that, since conntrack does not follow this flow.
So would it be better to only make sure that ctx->dev is not a bridge
master?
if (netif_is_bridge_master(ctx->dev))
return -1;
return dev_fill_forward_path_common(ctx, stack);
>> + return dev_fill_forward_path_common(ctx, stack);
>> +
>> + path = dev_fwd_path(stack);
>> + if (!path)
>> + return -1;
>> + path->type = DEV_PATH_ETHERNET;
>> + path->dev = ctx->dev;
>>
>> return ret;
>> }
>> +EXPORT_SYMBOL_GPL(dev_fill_bridge_path);
>> +
>> +int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr,
>> + struct net_device_path_stack *stack)
>> +{
>> + struct net_device_path_ctx ctx = {
>> + .dev = dev,
>> + };
>> +
>> + memcpy(ctx.daddr, daddr, sizeof(ctx.daddr));
>> +
>> + stack->num_paths = 0;
>> +
>> + return dev_fill_forward_path_common(&ctx, stack);
>> +}
>> EXPORT_SYMBOL_GPL(dev_fill_forward_path);
>>
>> /**
>
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