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)  *	Handle incoming frames
^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/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/etherdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/netfilter_bridge.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/netfilter/nf_queue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/neighbour.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/dsa.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/rculist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include "br_private.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include "br_private_tunnel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) br_netif_receive_skb(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	br_drop_fake_rtable(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	return netif_receive_skb(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) static int br_pass_frame_up(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct net_bridge *br = netdev_priv(brdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct net_bridge_vlan_group *vg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	u64_stats_update_begin(&brstats->syncp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	brstats->rx_packets++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	brstats->rx_bytes += skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	u64_stats_update_end(&brstats->syncp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	vg = br_vlan_group_rcu(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	/* Bridge is just like any other port.  Make sure the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	 * packet is allowed except in promisc modue when someone
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	 * may be running packet capture.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (!(brdev->flags & IFF_PROMISC) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	    !br_allowed_egress(vg, skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	indev = skb->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	skb->dev = brdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	skb = br_handle_vlan(br, NULL, vg, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		return NET_RX_DROP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	/* update the multicast stats if the packet is IGMP/MLD */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	br_multicast_count(br, NULL, skb, br_multicast_igmp_type(skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			   BR_MCAST_DIR_TX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	return NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		       dev_net(indev), NULL, skb, indev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		       br_netif_receive_skb);
^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) /* note: already called with rcu_read_lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	enum br_pkt_type pkt_type = BR_PKT_UNICAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct net_bridge_fdb_entry *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	struct net_bridge_mdb_entry *mdst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	bool local_rcv, mcast_hit = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	struct net_bridge *br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	u16 vid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	u8 state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (!p || p->state == BR_STATE_DISABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	state = p->state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (!br_allowed_ingress(p->br, nbp_vlan_group_rcu(p), skb, &vid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 				&state))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	nbp_switchdev_frame_mark(p, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	/* insert into forwarding database after filtering to avoid spoofing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	br = p->br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (p->flags & BR_LEARNING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		br_fdb_update(br, p, eth_hdr(skb)->h_source, vid, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	local_rcv = !!(br->dev->flags & IFF_PROMISC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		/* by definition the broadcast is also a multicast address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		if (is_broadcast_ether_addr(eth_hdr(skb)->h_dest)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 			pkt_type = BR_PKT_BROADCAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			local_rcv = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			pkt_type = BR_PKT_MULTICAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			if (br_multicast_rcv(br, p, skb, vid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 				goto drop;
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (state == BR_STATE_LEARNING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	BR_INPUT_SKB_CB(skb)->src_port_isolated = !!(p->flags & BR_ISOLATED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (IS_ENABLED(CONFIG_INET) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	    (skb->protocol == htons(ETH_P_ARP) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	     skb->protocol == htons(ETH_P_RARP))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		br_do_proxy_suppress_arp(skb, br, vid, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	} else if (IS_ENABLED(CONFIG_IPV6) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		   skb->protocol == htons(ETH_P_IPV6) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		   br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		   pskb_may_pull(skb, sizeof(struct ipv6hdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 				 sizeof(struct nd_msg)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		   ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			struct nd_msg *msg, _msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 			msg = br_is_nd_neigh_msg(skb, &_msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			if (msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 				br_do_suppress_nd(skb, br, vid, p, msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	switch (pkt_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	case BR_PKT_MULTICAST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		mdst = br_mdb_get(br, skb, vid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		if ((mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		    br_multicast_querier_exists(br, eth_hdr(skb))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			if ((mdst && mdst->host_joined) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			    br_multicast_is_router(br)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 				local_rcv = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 				br->dev->stats.multicast++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			mcast_hit = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			local_rcv = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			br->dev->stats.multicast++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	case BR_PKT_UNICAST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		dst = br_fdb_find_rcu(br, eth_hdr(skb)->h_dest, vid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (dst) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		unsigned long now = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		if (test_bit(BR_FDB_LOCAL, &dst->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			return br_pass_frame_up(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		if (now != dst->used)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			dst->used = now;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		br_forward(dst->dst, skb, local_rcv, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		if (!mcast_hit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			br_flood(br, skb, pkt_type, local_rcv, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			br_multicast_flood(mdst, skb, local_rcv, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (local_rcv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		return br_pass_frame_up(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) EXPORT_SYMBOL_GPL(br_handle_frame_finish);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static void __br_handle_local_finish(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	u16 vid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	/* check if vlan is allowed, to avoid spoofing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if ((p->flags & BR_LEARNING) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	    nbp_state_should_learn(p) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	    !br_opt_get(p->br, BROPT_NO_LL_LEARN) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	    br_should_learn(p, skb, &vid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* note: already called with rcu_read_lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static int br_handle_local_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	__br_handle_local_finish(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	/* return 1 to signal the okfn() was called so it's ok to use the skb */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static int nf_hook_bridge_pre(struct sk_buff *skb, struct sk_buff **pskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	struct nf_hook_entries *e = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	struct nf_hook_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	unsigned int verdict, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	struct net *net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	net = dev_net(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) #ifdef HAVE_JUMP_LABEL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (!static_key_false(&nf_hooks_needed[NFPROTO_BRIDGE][NF_BR_PRE_ROUTING]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		goto frame_finish;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	e = rcu_dereference(net->nf.hooks_bridge[NF_BR_PRE_ROUTING]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (!e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		goto frame_finish;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	nf_hook_state_init(&state, NF_BR_PRE_ROUTING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			   NFPROTO_BRIDGE, skb->dev, NULL, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			   net, br_handle_frame_finish);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	for (i = 0; i < e->num_hook_entries; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		verdict = nf_hook_entry_hookfn(&e->hooks[i], skb, &state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		switch (verdict & NF_VERDICT_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		case NF_ACCEPT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 			if (BR_INPUT_SKB_CB(skb)->br_netfilter_broute) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 				*pskb = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 				return RX_HANDLER_PASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		case NF_DROP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			return RX_HANDLER_CONSUMED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		case NF_QUEUE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			ret = nf_queue(skb, &state, i, verdict);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 			if (ret == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			return RX_HANDLER_CONSUMED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		default: /* STOLEN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			return RX_HANDLER_CONSUMED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) frame_finish:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	net = dev_net(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	br_handle_frame_finish(net, NULL, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	br_handle_frame_finish(dev_net(skb->dev), NULL, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	return RX_HANDLER_CONSUMED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)  * Return NULL if skb is handled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)  * note: already called with rcu_read_lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct sk_buff *skb = *pskb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	const unsigned char *dest = eth_hdr(skb)->h_dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		return RX_HANDLER_PASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	skb = skb_share_check(skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		return RX_HANDLER_CONSUMED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	memset(skb->cb, 0, sizeof(struct br_input_skb_cb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	p = br_port_get_rcu(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (p->flags & BR_VLAN_TUNNEL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		if (br_handle_ingress_vlan_tunnel(skb, p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 						  nbp_vlan_group_rcu(p)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	if (unlikely(is_link_local_ether_addr(dest))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		u16 fwd_mask = p->br->group_fwd_mask_required;
^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) 		 * See IEEE 802.1D Table 7-10 Reserved addresses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		 * Assignment		 		Value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		 * Bridge Group Address		01-80-C2-00-00-00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		 * (MAC Control) 802.3		01-80-C2-00-00-01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		 * (Link Aggregation) 802.3	01-80-C2-00-00-02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		 * 802.1X PAE address		01-80-C2-00-00-03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		 * 802.1AB LLDP 		01-80-C2-00-00-0E
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		 * Others reserved for future standardization
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		fwd_mask |= p->group_fwd_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		switch (dest[5]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		case 0x00:	/* Bridge Group Address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 			/* If STP is turned off,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			   then must forward to keep loop detection */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			if (p->br->stp_enabled == BR_NO_STP ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 			    fwd_mask & (1u << dest[5]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 				goto forward;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 			*pskb = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 			__br_handle_local_finish(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			return RX_HANDLER_PASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		case 0x01:	/* IEEE MAC (Pause) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 			goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		case 0x0E:	/* 802.1AB LLDP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			fwd_mask |= p->br->group_fwd_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			if (fwd_mask & (1u << dest[5]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 				goto forward;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			*pskb = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			__br_handle_local_finish(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			return RX_HANDLER_PASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 			/* Allow selective forwarding for most other protocols */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 			fwd_mask |= p->br->group_fwd_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 			if (fwd_mask & (1u << dest[5]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 				goto forward;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		/* The else clause should be hit when nf_hook():
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		 *   - returns < 0 (drop/error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		 *   - returns = 0 (stolen/nf_queue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		 * Thus return 1 from the okfn() to signal the skb is ok to pass
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		if (NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			    dev_net(skb->dev), NULL, skb, skb->dev, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 			    br_handle_local_finish) == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 			return RX_HANDLER_PASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 			return RX_HANDLER_CONSUMED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (unlikely(br_mrp_process(p, skb)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		return RX_HANDLER_PASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) forward:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	switch (p->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	case BR_STATE_FORWARDING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	case BR_STATE_LEARNING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		if (ether_addr_equal(p->br->dev->dev_addr, dest))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			skb->pkt_type = PACKET_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		return nf_hook_bridge_pre(skb, pskb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	return RX_HANDLER_CONSUMED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) /* This function has no purpose other than to appease the br_port_get_rcu/rtnl
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)  * helpers which identify bridged ports according to the rx_handler installed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)  * on them (so there _needs_ to be a bridge rx_handler even if we don't need it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)  * to do anything useful). This bridge won't support traffic to/from the stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)  * but only hardware bridging. So return RX_HANDLER_PASS so we don't steal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)  * frames from the ETH_P_XDSA packet_type handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) static rx_handler_result_t br_handle_frame_dummy(struct sk_buff **pskb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	return RX_HANDLER_PASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) rx_handler_func_t *br_get_rx_handler(const struct net_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	if (netdev_uses_dsa(dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		return br_handle_frame_dummy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	return br_handle_frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }