/* * Forwarding decision * Linux ethernet bridge * * Authors: * Lennert Buytenhek * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include #include #include #include #include "br_private.h" /* Don't forward packets to originating port or forwarding disabled */ static inline int should_deliver(const struct net_bridge_port *p, const struct sk_buff *skb) { struct net_bridge_vlan_group *vg; vg = nbp_vlan_group_rcu(p); return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) && br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING && nbp_switchdev_allowed_egress(p, skb); } int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) { if (!is_skb_forwardable(skb->dev, skb)) goto drop; skb_push(skb, ETH_HLEN); br_drop_fake_rtable(skb); if (skb->ip_summed == CHECKSUM_PARTIAL && (skb->protocol == htons(ETH_P_8021Q) || skb->protocol == htons(ETH_P_8021AD))) { int depth; if (!__vlan_get_protocol(skb, skb->protocol, &depth)) goto drop; skb_set_network_header(skb, depth); } dev_queue_xmit(skb); return 0; drop: kfree_skb(skb); return 0; } EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit); int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb) { return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING, net, sk, skb, NULL, skb->dev, br_dev_queue_push_xmit); } EXPORT_SYMBOL_GPL(br_forward_finish); static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb, bool local_orig) { struct net_bridge_vlan_group *vg; struct net_device *indev; struct net *net; int br_hook; vg = nbp_vlan_group_rcu(to); skb = br_handle_vlan(to->br, vg, skb); if (!skb) return; indev = skb->dev; skb->dev = to->dev; if (!local_orig) { if (skb_warn_if_lro(skb)) { kfree_skb(skb); return; } br_hook = NF_BR_FORWARD; skb_forward_csum(skb); net = dev_net(indev); } else { if (unlikely(netpoll_tx_running(to->br->dev))) { if (!is_skb_forwardable(skb->dev, skb)) { kfree_skb(skb); } else { skb_push(skb, ETH_HLEN); br_netpoll_send_skb(to, skb); } return; } br_hook = NF_BR_LOCAL_OUT; net = dev_net(skb->dev); indev = NULL; } NF_HOOK(NFPROTO_BRIDGE, br_hook, net, NULL, skb, indev, skb->dev, br_forward_finish); } static int deliver_clone(const struct net_bridge_port *prev, struct sk_buff *skb, bool local_orig) { struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev; skb = skb_clone(skb, GFP_ATOMIC); if (!skb) { dev->stats.tx_dropped++; return -ENOMEM; } __br_forward(prev, skb, local_orig); return 0; } /** * br_forward - forward a packet to a specific port * @to: destination port * @skb: packet being forwarded * @local_rcv: packet will be received locally after forwarding * @local_orig: packet is locally originated * * Should be called with rcu_read_lock. */ void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, bool local_rcv, bool local_orig) { if (to && should_deliver(to, skb)) { if (local_rcv) deliver_clone(to, skb, local_orig); else __br_forward(to, skb, local_orig); return; } if (!local_rcv) kfree_skb(skb); } EXPORT_SYMBOL_GPL(br_forward); static struct net_bridge_port *maybe_deliver( struct net_bridge_port *prev, struct net_bridge_port *p, struct sk_buff *skb, bool local_orig) { int err; if (!should_deliver(p, skb)) return prev; if (!prev) goto out; err = deliver_clone(prev, skb, local_orig); if (err) return ERR_PTR(err); out: return p; } /* called under rcu_read_lock */ void br_flood(struct net_bridge *br, struct sk_buff *skb, enum br_pkt_type pkt_type, bool local_rcv, bool local_orig) { u8 igmp_type = br_multicast_igmp_type(skb); struct net_bridge_port *prev = NULL; struct net_bridge_port *p; list_for_each_entry_rcu(p, &br->port_list, list) { /* Do not flood unicast traffic to ports that turn it off */ if (pkt_type == BR_PKT_UNICAST && !(p->flags & BR_FLOOD)) continue; if (pkt_type == BR_PKT_MULTICAST && !(p->flags & BR_MCAST_FLOOD)) continue; /* Do not flood to ports that enable proxy ARP */ if (p->flags & BR_PROXYARP) continue; if ((p->flags & BR_PROXYARP_WIFI) && BR_INPUT_SKB_CB(skb)->proxyarp_replied) continue; prev = maybe_deliver(prev, p, skb, local_orig); if (IS_ERR(prev)) goto out; if (prev == p) br_multicast_count(p->br, p, skb, igmp_type, BR_MCAST_DIR_TX); } if (!prev) goto out; if (local_rcv) deliver_clone(prev, skb, local_orig); else __br_forward(prev, skb, local_orig); return; out: if (!local_rcv) kfree_skb(skb); } #ifdef CONFIG_BRIDGE_IGMP_SNOOPING /* called with rcu_read_lock */ void br_multicast_flood(struct net_bridge_mdb_entry *mdst, struct sk_buff *skb, bool local_rcv, bool local_orig) { struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev; u8 igmp_type = br_multicast_igmp_type(skb); struct net_bridge *br = netdev_priv(dev); struct net_bridge_port *prev = NULL; struct net_bridge_port_group *p; struct hlist_node *rp; rp = rcu_dereference(hlist_first_rcu(&br->router_list)); p = mdst ? rcu_dereference(mdst->ports) : NULL; while (p || rp) { struct net_bridge_port *port, *lport, *rport; lport = p ? p->port : NULL; rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) : NULL; port = (unsigned long)lport > (unsigned long)rport ? lport : rport; prev = maybe_deliver(prev, port, skb, local_orig); if (IS_ERR(prev)) goto out; if (prev == port) br_multicast_count(port->br, port, skb, igmp_type, BR_MCAST_DIR_TX); if ((unsigned long)lport >= (unsigned long)port) p = rcu_dereference(p->next); if ((unsigned long)rport >= (unsigned long)port) rp = rcu_dereference(hlist_next_rcu(rp)); } if (!prev) goto out; if (local_rcv) deliver_clone(prev, skb, local_orig); else __br_forward(prev, skb, local_orig); return; out: if (!local_rcv) kfree_skb(skb); } #endif - Use mutex_destroy. Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Sean Paul <seanpaul@chromium.org> Reported-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161218133545.2106-1-daniel.vetter@ffwll.ch (cherry picked from commit e73ab00e9a0f1731f34d0620a9c55f5c30c4ad4e)
Diffstat (limited to 'include/net/mpls_iptunnel.h')