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[212.51.151.130]) by smtp.gmail.com with ESMTPSA id r1sm2456216wmh.32.2021.06.24.02.18.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Jun 2021 02:18:58 -0700 (PDT) From: joamaki@gmail.com To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, daniel@iogearbox.net, j.vosburgh@gmail.com, andy@greyhouse.net, vfalico@gmail.com, andrii@kernel.org, maciej.fijalkowski@intel.com, magnus.karlsson@intel.com, Jussi Maki Subject: [PATCH bpf-next v2 4/4] devmap: Exclude XDP broadcast to master device Date: Thu, 24 Jun 2021 09:18:43 +0000 Message-Id: <20210624091843.5151-5-joamaki@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210624091843.5151-1-joamaki@gmail.com> References: <20210609135537.1460244-1-joamaki@gmail.com> <20210624091843.5151-1-joamaki@gmail.com> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Jussi Maki If the ingress device is bond slave, do not broadcast back through it or the bond master. Signed-off-by: Jussi Maki --- kernel/bpf/devmap.c | 34 ++++++++++++++++++++++++++++------ 1 file changed, 28 insertions(+), 6 deletions(-) diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 2a75e6c2d27d..0864fb28c8b5 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -514,9 +514,11 @@ int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp, } static bool is_valid_dst(struct bpf_dtab_netdev *obj, struct xdp_buff *xdp, - int exclude_ifindex) + int exclude_ifindex, int exclude_ifindex_master) { - if (!obj || obj->dev->ifindex == exclude_ifindex || + if (!obj || + obj->dev->ifindex == exclude_ifindex || + obj->dev->ifindex == exclude_ifindex_master || !obj->dev->netdev_ops->ndo_xdp_xmit) return false; @@ -546,12 +548,19 @@ int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx, { struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); int exclude_ifindex = exclude_ingress ? dev_rx->ifindex : 0; + int exclude_ifindex_master = 0; struct bpf_dtab_netdev *dst, *last_dst = NULL; struct hlist_head *head; struct xdp_frame *xdpf; unsigned int i; int err; + if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) { + struct net_device *master = netdev_master_upper_dev_get_rcu(dev_rx); + + exclude_ifindex_master = (master && exclude_ingress) ? master->ifindex : 0; + } + xdpf = xdp_convert_buff_to_frame(xdp); if (unlikely(!xdpf)) return -EOVERFLOW; @@ -559,7 +568,7 @@ int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx, if (map->map_type == BPF_MAP_TYPE_DEVMAP) { for (i = 0; i < map->max_entries; i++) { dst = READ_ONCE(dtab->netdev_map[i]); - if (!is_valid_dst(dst, xdp, exclude_ifindex)) + if (!is_valid_dst(dst, xdp, exclude_ifindex, exclude_ifindex_master)) continue; /* we only need n-1 clones; last_dst enqueued below */ @@ -579,7 +588,9 @@ int dev_map_enqueue_multi(struct xdp_buff *xdp, struct net_device *dev_rx, head = dev_map_index_hash(dtab, i); hlist_for_each_entry_rcu(dst, head, index_hlist, lockdep_is_held(&dtab->index_lock)) { - if (!is_valid_dst(dst, xdp, exclude_ifindex)) + if (!is_valid_dst(dst, xdp, + exclude_ifindex, + exclude_ifindex_master)) continue; /* we only need n-1 clones; last_dst enqueued below */ @@ -646,16 +657,25 @@ int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, { struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); int exclude_ifindex = exclude_ingress ? dev->ifindex : 0; + int exclude_ifindex_master = 0; struct bpf_dtab_netdev *dst, *last_dst = NULL; struct hlist_head *head; struct hlist_node *next; unsigned int i; int err; + if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) { + struct net_device *master = netdev_master_upper_dev_get_rcu(dev); + + exclude_ifindex_master = (master && exclude_ingress) ? master->ifindex : 0; + } + if (map->map_type == BPF_MAP_TYPE_DEVMAP) { for (i = 0; i < map->max_entries; i++) { dst = READ_ONCE(dtab->netdev_map[i]); - if (!dst || dst->dev->ifindex == exclude_ifindex) + if (!dst || + dst->dev->ifindex == exclude_ifindex || + dst->dev->ifindex == exclude_ifindex_master) continue; /* we only need n-1 clones; last_dst enqueued below */ @@ -674,7 +694,9 @@ int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb, for (i = 0; i < dtab->n_buckets; i++) { head = dev_map_index_hash(dtab, i); hlist_for_each_entry_safe(dst, next, head, index_hlist) { - if (!dst || dst->dev->ifindex == exclude_ifindex) + if (!dst || + dst->dev->ifindex == exclude_ifindex || + dst->dev->ifindex == exclude_ifindex_master) continue; /* we only need n-1 clones; last_dst enqueued below */ -- 2.27.0