[PATCH v9 nf 07/15] net: core: dev: Add dev_fill_bridge_path()
From: Eric Woudstra <hidden>
Date: 2025-03-05 10:30:14
Also in:
bridge, linux-arm-kernel, linux-hardening, linux-mediatek, lkml, netfilter-devel
Subsystem:
networking drivers, networking [general], the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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. Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: Eric Woudstra <redacted> --- include/linux/netdevice.h | 2 ++ net/core/dev.c | 66 +++++++++++++++++++++++++++++++-------- 2 files changed, 55 insertions(+), 13 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7ab86ec228b7..81cdad85d9f1 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h@@ -3318,6 +3318,8 @@ 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 2dc705604509..d0810f052d3a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -714,44 +714,84 @@ 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; + + 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)); + if (br_dev->netdev_ops->ndo_fill_forward_path(ctx, path) < 0) + return -1; + + if (!ctx->dev || WARN_ON_ONCE(last_dev == ctx->dev)) + return -1; + + return dev_fill_forward_path_common(ctx, stack); +} +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); /* must be called under rcu_read_lock(), as we dont take a reference */
--
2.47.1