Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *	Forwarding decision
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *	Linux ethernet bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *	Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *	Lennert Buytenhek		<buytenh@gnu.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/netpoll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/if_vlan.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/netfilter_bridge.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "br_private.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /* Don't forward packets to originating port or forwarding disabled */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static inline int should_deliver(const struct net_bridge_port *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 				 const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct net_bridge_vlan_group *vg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	vg = nbp_vlan_group_rcu(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		p->state == BR_STATE_FORWARDING && br_allowed_egress(vg, skb) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		nbp_switchdev_allowed_egress(p, skb) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		!br_skb_isolated(p, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	skb_push(skb, ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	if (!is_skb_forwardable(skb->dev, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	br_drop_fake_rtable(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if (skb->ip_summed == CHECKSUM_PARTIAL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	    (skb->protocol == htons(ETH_P_8021Q) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	     skb->protocol == htons(ETH_P_8021AD))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		int depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		if (!__vlan_get_protocol(skb, skb->protocol, &depth))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 			goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		skb_set_network_header(skb, depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	dev_queue_xmit(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) EXPORT_SYMBOL_GPL(br_dev_queue_push_xmit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	skb->tstamp = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		       net, sk, skb, NULL, skb->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		       br_dev_queue_push_xmit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) EXPORT_SYMBOL_GPL(br_forward_finish);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static void __br_forward(const struct net_bridge_port *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			 struct sk_buff *skb, bool local_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct net_bridge_vlan_group *vg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	struct net_device *indev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct net *net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	int br_hook;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	vg = nbp_vlan_group_rcu(to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	skb = br_handle_vlan(to->br, to, vg, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	indev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	skb->dev = to->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (!local_orig) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		if (skb_warn_if_lro(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		br_hook = NF_BR_FORWARD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		skb_forward_csum(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		net = dev_net(indev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		if (unlikely(netpoll_tx_running(to->br->dev))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 			skb_push(skb, ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			if (!is_skb_forwardable(skb->dev, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 				kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 				br_netpoll_send_skb(to, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		br_hook = NF_BR_LOCAL_OUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		net = dev_net(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		indev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	NF_HOOK(NFPROTO_BRIDGE, br_hook,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		net, NULL, skb, indev, skb->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		br_forward_finish);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int deliver_clone(const struct net_bridge_port *prev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			 struct sk_buff *skb, bool local_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	skb = skb_clone(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		dev->stats.tx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	__br_forward(prev, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  * br_forward - forward a packet to a specific port
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  * @to: destination port
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  * @skb: packet being forwarded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * @local_rcv: packet will be received locally after forwarding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * @local_orig: packet is locally originated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * Should be called with rcu_read_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) void br_forward(const struct net_bridge_port *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		struct sk_buff *skb, bool local_rcv, bool local_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (unlikely(!to))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	/* redirect to backup link if the destination port is down */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (rcu_access_pointer(to->backup_port) && !netif_carrier_ok(to->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		struct net_bridge_port *backup_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		backup_port = rcu_dereference(to->backup_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		if (unlikely(!backup_port))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		to = backup_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (should_deliver(to, skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		if (local_rcv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			deliver_clone(to, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			__br_forward(to, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (!local_rcv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) EXPORT_SYMBOL_GPL(br_forward);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static struct net_bridge_port *maybe_deliver(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	struct net_bridge_port *prev, struct net_bridge_port *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct sk_buff *skb, bool local_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	u8 igmp_type = br_multicast_igmp_type(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (!should_deliver(p, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		return prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (!prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	err = deliver_clone(prev, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	br_multicast_count(p->br, p, skb, igmp_type, BR_MCAST_DIR_TX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /* called under rcu_read_lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) void br_flood(struct net_bridge *br, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	struct net_bridge_port *prev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	list_for_each_entry_rcu(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		/* Do not flood unicast traffic to ports that turn it off, nor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		 * other traffic if flood off, except for traffic we originate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		switch (pkt_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		case BR_PKT_UNICAST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			if (!(p->flags & BR_FLOOD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		case BR_PKT_MULTICAST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			if (!(p->flags & BR_MCAST_FLOOD) && skb->dev != br->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		case BR_PKT_BROADCAST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			if (!(p->flags & BR_BCAST_FLOOD) && skb->dev != br->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		/* Do not flood to ports that enable proxy ARP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		if (p->flags & BR_PROXYARP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		if ((p->flags & (BR_PROXYARP_WIFI | BR_NEIGH_SUPPRESS)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		    BR_INPUT_SKB_CB(skb)->proxyarp_replied)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		prev = maybe_deliver(prev, p, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		if (IS_ERR(prev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (!prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (local_rcv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		deliver_clone(prev, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		__br_forward(prev, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (!local_rcv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			       const unsigned char *addr, bool local_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	const unsigned char *src = eth_hdr(skb)->h_source;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (!should_deliver(p, skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	/* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (skb->dev == p->dev && ether_addr_equal(src, addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	skb = skb_copy(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		dev->stats.tx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (!is_broadcast_ether_addr(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	__br_forward(p, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) /* called with rcu_read_lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			bool local_rcv, bool local_orig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	struct net_bridge *br = netdev_priv(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	struct net_bridge_port *prev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	struct net_bridge_port_group *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	bool allow_mode_include = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	struct hlist_node *rp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	rp = rcu_dereference(hlist_first_rcu(&br->router_list));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	if (mdst) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		p = rcu_dereference(mdst->ports);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		if (br_multicast_should_handle_mode(br, mdst->addr.proto) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		    br_multicast_is_star_g(&mdst->addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			allow_mode_include = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	while (p || rp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		struct net_bridge_port *port, *lport, *rport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		lport = p ? p->key.port : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		rport = hlist_entry_safe(rp, struct net_bridge_port, rlist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		if ((unsigned long)lport > (unsigned long)rport) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			port = lport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			if (port->flags & BR_MULTICAST_TO_UNICAST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 				maybe_deliver_addr(lport, skb, p->eth_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 						   local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 				goto delivered;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 			if ((!allow_mode_include &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 			     p->filter_mode == MCAST_INCLUDE) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			    (p->flags & MDB_PG_FLAGS_BLOCKED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 				goto delivered;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			port = rport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		prev = maybe_deliver(prev, port, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		if (IS_ERR(prev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) delivered:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		if ((unsigned long)lport >= (unsigned long)port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			p = rcu_dereference(p->next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		if ((unsigned long)rport >= (unsigned long)port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			rp = rcu_dereference(hlist_next_rcu(rp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (!prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	if (local_rcv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 		deliver_clone(prev, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		__br_forward(prev, skb, local_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (!local_rcv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) #endif