Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Handle firewalling |
| 3 | * Linux ethernet bridge |
| 4 | * |
| 5 | * Authors: |
Bart De Schuymer | 8237908 | 2010-04-13 11:40:41 +0200 | [diff] [blame] | 6 | * Lennert Buytenhek <buytenh@gnu.org> |
| 7 | * Bart De Schuymer <bdschuym@pandora.be> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * Lennert dedicates this file to Kerstin Wurdinger. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/ip.h> |
| 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/skbuff.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 23 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/if_ether.h> |
| 25 | #include <linux/if_vlan.h> |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 26 | #include <linux/if_pppox.h> |
| 27 | #include <linux/ppp_defs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/netfilter_bridge.h> |
| 29 | #include <linux/netfilter_ipv4.h> |
| 30 | #include <linux/netfilter_ipv6.h> |
| 31 | #include <linux/netfilter_arp.h> |
| 32 | #include <linux/in_route.h> |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 33 | #include <linux/inetdevice.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <net/ip.h> |
| 36 | #include <net/ipv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 37 | #include <net/route.h> |
Florian Westphal | 5676864 | 2014-11-13 10:04:16 +0100 | [diff] [blame] | 38 | #include <net/netfilter/br_netfilter.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include "br_private.h" |
| 42 | #ifdef CONFIG_SYSCTL |
| 43 | #include <linux/sysctl.h> |
| 44 | #endif |
| 45 | |
| 46 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ |
| 47 | (skb->nf_bridge->data))->daddr.ipv4) |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 48 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
| 49 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #ifdef CONFIG_SYSCTL |
| 52 | static struct ctl_table_header *brnf_sysctl_header; |
Brian Haley | 9c1ea14 | 2006-09-18 00:03:41 -0700 | [diff] [blame] | 53 | static int brnf_call_iptables __read_mostly = 1; |
| 54 | static int brnf_call_ip6tables __read_mostly = 1; |
| 55 | static int brnf_call_arptables __read_mostly = 1; |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 56 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
| 57 | static int brnf_filter_pppoe_tagged __read_mostly = 0; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 58 | static int brnf_pass_vlan_indev __read_mostly = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #else |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 60 | #define brnf_call_iptables 1 |
| 61 | #define brnf_call_ip6tables 1 |
| 62 | #define brnf_call_arptables 1 |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 63 | #define brnf_filter_vlan_tagged 0 |
| 64 | #define brnf_filter_pppoe_tagged 0 |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 65 | #define brnf_pass_vlan_indev 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #endif |
| 67 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 68 | #define IS_IP(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 69 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 70 | |
| 71 | #define IS_IPV6(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 72 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 73 | |
| 74 | #define IS_ARP(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 75 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 76 | |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 77 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 78 | { |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 79 | if (skb_vlan_tag_present(skb)) |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 80 | return skb->protocol; |
| 81 | else if (skb->protocol == htons(ETH_P_8021Q)) |
| 82 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; |
| 83 | else |
| 84 | return 0; |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | #define IS_VLAN_IP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 88 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 89 | brnf_filter_vlan_tagged) |
| 90 | |
| 91 | #define IS_VLAN_IPV6(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 92 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 93 | brnf_filter_vlan_tagged) |
| 94 | |
| 95 | #define IS_VLAN_ARP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 96 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 97 | brnf_filter_vlan_tagged) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 99 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
| 100 | { |
| 101 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + |
| 102 | sizeof(struct pppoe_hdr))); |
| 103 | } |
| 104 | |
| 105 | #define IS_PPPOE_IP(skb) \ |
| 106 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 107 | pppoe_proto(skb) == htons(PPP_IP) && \ |
| 108 | brnf_filter_pppoe_tagged) |
| 109 | |
| 110 | #define IS_PPPOE_IPV6(skb) \ |
| 111 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 112 | pppoe_proto(skb) == htons(PPP_IPV6) && \ |
| 113 | brnf_filter_pppoe_tagged) |
| 114 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 115 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
| 116 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 117 | struct net_bridge_port *port; |
| 118 | |
| 119 | port = br_port_get_rcu(dev); |
| 120 | return port ? &port->br->fake_rtable : NULL; |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 121 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 123 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
| 124 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 125 | struct net_bridge_port *port; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 126 | |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 127 | port = br_port_get_rcu(dev); |
| 128 | return port ? port->br->dev : NULL; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 131 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
| 132 | { |
| 133 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); |
| 134 | if (likely(skb->nf_bridge)) |
| 135 | atomic_set(&(skb->nf_bridge->use), 1); |
| 136 | |
| 137 | return skb->nf_bridge; |
| 138 | } |
| 139 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 140 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
| 141 | { |
| 142 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 143 | |
| 144 | if (atomic_read(&nf_bridge->use) > 1) { |
| 145 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); |
| 146 | |
| 147 | if (tmp) { |
| 148 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); |
| 149 | atomic_set(&tmp->use, 1); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 150 | } |
Changli Gao | 4c3a76a | 2010-08-22 19:03:26 +0000 | [diff] [blame] | 151 | nf_bridge_put(nf_bridge); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 152 | nf_bridge = tmp; |
| 153 | } |
| 154 | return nf_bridge; |
| 155 | } |
| 156 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 157 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
| 158 | { |
| 159 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 160 | |
| 161 | skb_push(skb, len); |
| 162 | skb->network_header -= len; |
| 163 | } |
| 164 | |
| 165 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
| 166 | { |
| 167 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 168 | |
| 169 | skb_pull(skb, len); |
| 170 | skb->network_header += len; |
| 171 | } |
| 172 | |
| 173 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
| 174 | { |
| 175 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 176 | |
| 177 | skb_pull_rcsum(skb, len); |
| 178 | skb->network_header += len; |
| 179 | } |
| 180 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 181 | static inline void nf_bridge_save_header(struct sk_buff *skb) |
| 182 | { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 183 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 184 | |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 185 | skb_copy_from_linear_data_offset(skb, -header_size, |
| 186 | skb->nf_bridge->data, header_size); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 187 | } |
| 188 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 189 | /* When handing a packet over to the IP layer |
| 190 | * check whether we have a skb that is in the |
| 191 | * expected format |
| 192 | */ |
| 193 | |
stephen hemminger | d028023 | 2010-10-18 14:03:21 +0000 | [diff] [blame] | 194 | static int br_parse_ip_options(struct sk_buff *skb) |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 195 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 196 | const struct iphdr *iph; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 197 | struct net_device *dev = skb->dev; |
| 198 | u32 len; |
| 199 | |
Sarveshwar Bandi | 6caab7b | 2012-10-10 01:15:01 +0000 | [diff] [blame] | 200 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 201 | goto inhdr_error; |
| 202 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 203 | iph = ip_hdr(skb); |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 204 | |
| 205 | /* Basic sanity checks */ |
| 206 | if (iph->ihl < 5 || iph->version != 4) |
| 207 | goto inhdr_error; |
| 208 | |
| 209 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 210 | goto inhdr_error; |
| 211 | |
| 212 | iph = ip_hdr(skb); |
| 213 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
| 214 | goto inhdr_error; |
| 215 | |
| 216 | len = ntohs(iph->tot_len); |
| 217 | if (skb->len < len) { |
| 218 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); |
| 219 | goto drop; |
| 220 | } else if (len < (iph->ihl*4)) |
| 221 | goto inhdr_error; |
| 222 | |
| 223 | if (pskb_trim_rcsum(skb, len)) { |
| 224 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
| 225 | goto drop; |
| 226 | } |
| 227 | |
Eric Dumazet | f8e9881 | 2011-04-12 13:39:14 -0700 | [diff] [blame] | 228 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
Herbert Xu | 7677e86 | 2014-10-04 22:18:02 +0800 | [diff] [blame] | 229 | /* We should really parse IP options here but until |
| 230 | * somebody who actually uses IP options complains to |
| 231 | * us we'll just silently ignore the options because |
| 232 | * we're lazy! |
| 233 | */ |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 234 | return 0; |
| 235 | |
| 236 | inhdr_error: |
| 237 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); |
| 238 | drop: |
| 239 | return -1; |
| 240 | } |
| 241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
| 243 | /* Undo the changes made for ip6tables PREROUTING and continue the |
| 244 | * bridge PRE_ROUTING hook. */ |
| 245 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) |
| 246 | { |
| 247 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 248 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 251 | skb->pkt_type = PACKET_OTHERHOST; |
| 252 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 253 | } |
| 254 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
| 255 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 256 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 257 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 258 | kfree_skb(skb); |
| 259 | return 0; |
| 260 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 261 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 264 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 265 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 266 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | br_handle_frame_finish, 1); |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 272 | /* Obtain the correct destination MAC address, while preserving the original |
| 273 | * source MAC address. If we already know this address, we just copy it. If we |
| 274 | * don't, we use the neighbour framework to find out. In both cases, we make |
| 275 | * sure that br_handle_frame_finish() is called afterwards. |
| 276 | */ |
| 277 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
| 278 | { |
| 279 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 280 | struct neighbour *neigh; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 281 | struct dst_entry *dst; |
| 282 | |
| 283 | skb->dev = bridge_parent(skb->dev); |
| 284 | if (!skb->dev) |
| 285 | goto free_skb; |
| 286 | dst = skb_dst(skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 287 | neigh = dst_neigh_lookup_skb(dst, skb); |
| 288 | if (neigh) { |
| 289 | int ret; |
| 290 | |
| 291 | if (neigh->hh.hh_len) { |
| 292 | neigh_hh_bridge(&neigh->hh, skb); |
| 293 | skb->dev = nf_bridge->physindev; |
| 294 | ret = br_handle_frame_finish(skb); |
| 295 | } else { |
| 296 | /* the neighbour function below overwrites the complete |
| 297 | * MAC header, so we save the Ethernet source address and |
| 298 | * protocol number. |
| 299 | */ |
| 300 | skb_copy_from_linear_data_offset(skb, |
| 301 | -(ETH_HLEN-ETH_ALEN), |
| 302 | skb->nf_bridge->data, |
| 303 | ETH_HLEN-ETH_ALEN); |
| 304 | /* tell br_dev_xmit to continue with forwarding */ |
| 305 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 306 | /* FIXME Need to refragment */ |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 307 | ret = neigh->output(neigh, skb); |
| 308 | } |
| 309 | neigh_release(neigh); |
| 310 | return ret; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 311 | } |
| 312 | free_skb: |
| 313 | kfree_skb(skb); |
| 314 | return 0; |
| 315 | } |
| 316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | /* This requires some explaining. If DNAT has taken place, |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 318 | * we will need to fix up the destination Ethernet address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | * |
| 320 | * There are two cases to consider: |
| 321 | * 1. The packet was DNAT'ed to a device in the same bridge |
| 322 | * port group as it was received on. We can still bridge |
| 323 | * the packet. |
| 324 | * 2. The packet was DNAT'ed to a different device, either |
| 325 | * a non-bridged device or another bridge port group. |
| 326 | * The packet will need to be routed. |
| 327 | * |
| 328 | * The correct way of distinguishing between these two cases is to |
| 329 | * call ip_route_input() and to look at skb->dst->dev, which is |
| 330 | * changed to the destination device if ip_route_input() succeeds. |
| 331 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 332 | * Let's first consider the case that ip_route_input() succeeds: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 334 | * If the output device equals the logical bridge device the packet |
| 335 | * came in on, we can consider this bridging. The corresponding MAC |
| 336 | * address will be obtained in br_nf_pre_routing_finish_bridge. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | * Otherwise, the packet is considered to be routed and we just |
| 338 | * change the destination MAC address so that the packet will |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 339 | * later be passed up to the IP stack to be routed. For a redirected |
| 340 | * packet, ip_route_input() will give back the localhost as output device, |
| 341 | * which differs from the bridge device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 343 | * Let's now consider the case that ip_route_input() fails: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | * |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 345 | * This can be because the destination address is martian, in which case |
| 346 | * the packet will be dropped. |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 347 | * If IP forwarding is disabled, ip_route_input() will fail, while |
| 348 | * ip_route_output_key() can return success. The source |
| 349 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | * thinks we're handling a locally generated packet and won't care |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 351 | * if IP forwarding is enabled. If the output device equals the logical bridge |
| 352 | * device, we proceed as if ip_route_input() succeeded. If it differs from the |
| 353 | * logical bridge port or if ip_route_output_key() fails we drop the packet. |
| 354 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
| 356 | { |
| 357 | struct net_device *dev = skb->dev; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 358 | struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 360 | struct rtable *rt; |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 361 | int err; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 362 | int frag_max_size; |
| 363 | |
| 364 | frag_max_size = IPCB(skb)->frag_max_size; |
| 365 | BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 368 | skb->pkt_type = PACKET_OTHERHOST; |
| 369 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 370 | } |
| 371 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | if (dnat_took_place(skb)) { |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 373 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
Eric Dumazet | f3abc9b | 2009-08-24 19:35:38 +0200 | [diff] [blame] | 374 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 375 | |
| 376 | /* If err equals -EHOSTUNREACH the error is due to a |
| 377 | * martian destination or due to the fact that |
| 378 | * forwarding is disabled. For most martian packets, |
| 379 | * ip_route_output_key() will fail. It won't fail for 2 types of |
| 380 | * martian destinations: loopback destinations and destination |
| 381 | * 0.0.0.0. In both cases the packet will be dropped because the |
| 382 | * destination is the loopback device and not the bridge. */ |
| 383 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) |
| 384 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
David S. Miller | 78fbfd8 | 2011-03-12 00:00:52 -0500 | [diff] [blame] | 386 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
| 387 | RT_TOS(iph->tos), 0); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 388 | if (!IS_ERR(rt)) { |
Bart De Schuymer | 1c011be | 2005-09-14 20:55:16 -0700 | [diff] [blame] | 389 | /* - Bridged-and-DNAT'ed traffic doesn't |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 390 | * require ip_forwarding. */ |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 391 | if (rt->dst.dev == dev) { |
| 392 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | goto bridged_dnat; |
| 394 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 395 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 397 | free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | kfree_skb(skb); |
| 399 | return 0; |
| 400 | } else { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 401 | if (skb_dst(skb)->dev == dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | bridged_dnat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 404 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 405 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 406 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
| 407 | NF_BR_PRE_ROUTING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | skb, skb->dev, NULL, |
| 409 | br_nf_pre_routing_finish_bridge, |
| 410 | 1); |
| 411 | return 0; |
| 412 | } |
Joe Perches | 0409114 | 2014-02-23 00:05:26 -0800 | [diff] [blame] | 413 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | skb->pkt_type = PACKET_HOST; |
| 415 | } |
| 416 | } else { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 417 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 418 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 419 | kfree_skb(skb); |
| 420 | return 0; |
| 421 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 422 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 426 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 427 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 428 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | br_handle_frame_finish, 1); |
| 430 | |
| 431 | return 0; |
| 432 | } |
| 433 | |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 434 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
| 435 | { |
| 436 | struct net_device *vlan, *br; |
| 437 | |
| 438 | br = bridge_parent(dev); |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 439 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 440 | return br; |
| 441 | |
dingtianhong | f06c7f9 | 2014-05-09 14:58:05 +0800 | [diff] [blame] | 442 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 443 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 444 | |
| 445 | return vlan ? vlan : br; |
| 446 | } |
| 447 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | /* Some common code for IPv4/IPv6 */ |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 449 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | { |
| 451 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 452 | |
| 453 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 454 | skb->pkt_type = PACKET_HOST; |
| 455 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 456 | } |
| 457 | |
| 458 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; |
| 459 | nf_bridge->physindev = skb->dev; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 460 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 461 | if (skb->protocol == htons(ETH_P_8021Q)) |
| 462 | nf_bridge->mask |= BRNF_8021Q; |
| 463 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
| 464 | nf_bridge->mask |= BRNF_PPPoE; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 465 | |
Florian Westphal | 6b8dbcf | 2013-10-24 21:32:42 +0200 | [diff] [blame] | 466 | /* Must drop socket now because of tproxy. */ |
| 467 | skb_orphan(skb); |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 468 | return skb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ |
| 472 | static int check_hbh_len(struct sk_buff *skb) |
| 473 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 474 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | u32 pkt_len; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 476 | const unsigned char *nh = skb_network_header(skb); |
| 477 | int off = raw - nh; |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 478 | int len = (raw[1] + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | if ((raw + len) - skb->data > skb_headlen(skb)) |
| 481 | goto bad; |
| 482 | |
| 483 | off += 2; |
| 484 | len -= 2; |
| 485 | |
| 486 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 487 | int optlen = nh[off + 1] + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 489 | switch (nh[off]) { |
Eldad Zack | 1de5a71 | 2012-05-17 06:00:25 +0000 | [diff] [blame] | 490 | case IPV6_TLV_PAD1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | optlen = 1; |
| 492 | break; |
| 493 | |
| 494 | case IPV6_TLV_PADN: |
| 495 | break; |
| 496 | |
| 497 | case IPV6_TLV_JUMBO: |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 498 | if (nh[off + 1] != 4 || (off & 3) != 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 500 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 501 | if (pkt_len <= IPV6_MAXPLEN || |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 502 | ipv6_hdr(skb)->payload_len) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 503 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
| 505 | goto bad; |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 506 | if (pskb_trim_rcsum(skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 507 | pkt_len + sizeof(struct ipv6hdr))) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 508 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 509 | nh = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | break; |
| 511 | default: |
| 512 | if (optlen > len) |
| 513 | goto bad; |
| 514 | break; |
| 515 | } |
| 516 | off += optlen; |
| 517 | len -= optlen; |
| 518 | } |
| 519 | if (len == 0) |
| 520 | return 0; |
| 521 | bad: |
| 522 | return -1; |
| 523 | |
| 524 | } |
| 525 | |
| 526 | /* Replicate the checks that IPv6 does on packet reception and pass the packet |
| 527 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 528 | static unsigned int br_nf_pre_routing_ipv6(const struct nf_hook_ops *ops, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 529 | struct sk_buff *skb, |
| 530 | const struct net_device *in, |
| 531 | const struct net_device *out, |
| 532 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 534 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | u32 pkt_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
| 537 | if (skb->len < sizeof(struct ipv6hdr)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 538 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
| 540 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 541 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 543 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
| 545 | if (hdr->version != 6) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 546 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
| 548 | pkt_len = ntohs(hdr->payload_len); |
| 549 | |
| 550 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
| 551 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 552 | return NF_DROP; |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 553 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 554 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
| 556 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 557 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 559 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 560 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 562 | if (!setup_pre_routing(skb)) |
| 563 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 565 | skb->protocol = htons(ETH_P_IPV6); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 566 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | br_nf_pre_routing_finish_ipv6); |
| 568 | |
| 569 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | } |
| 571 | |
| 572 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
| 573 | * Replicate the checks that IPv4 does on packet reception. |
| 574 | * Set skb->dev to the bridge device (i.e. parent of the |
| 575 | * receiving device) to make netfilter happy, the REDIRECT |
| 576 | * target in particular. Save the original destination IP |
| 577 | * address to be able to detect DNAT afterwards. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 578 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
| 579 | struct sk_buff *skb, |
Stephen Hemminger | ee02b3a | 2006-01-06 13:13:29 -0800 | [diff] [blame] | 580 | const struct net_device *in, |
| 581 | const struct net_device *out, |
| 582 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 584 | struct net_bridge_port *p; |
| 585 | struct net_bridge *br; |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 586 | __u32 len = nf_bridge_encap_header_len(skb); |
| 587 | |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 588 | if (unlikely(!pskb_may_pull(skb, len))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 589 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
David S. Miller | e490c1de | 2010-07-02 22:42:06 -0700 | [diff] [blame] | 591 | p = br_port_get_rcu(in); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 592 | if (p == NULL) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 593 | return NF_DROP; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 594 | br = p->br; |
| 595 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 596 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 597 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 599 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 600 | nf_bridge_pull_encap_header_rcsum(skb); |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 601 | return br_nf_pre_routing_ipv6(ops, skb, in, out, okfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 603 | |
| 604 | if (!brnf_call_iptables && !br->nf_call_iptables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 607 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | return NF_ACCEPT; |
| 609 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 610 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 612 | if (br_parse_ip_options(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 613 | return NF_DROP; |
Herbert Xu | 1776206 | 2010-07-05 21:29:28 +0000 | [diff] [blame] | 614 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 615 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 616 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 618 | if (!setup_pre_routing(skb)) |
| 619 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | store_orig_dstaddr(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 621 | skb->protocol = htons(ETH_P_IP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 623 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | br_nf_pre_routing_finish); |
| 625 | |
| 626 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
| 628 | |
| 629 | |
| 630 | /* PF_BRIDGE/LOCAL_IN ************************************************/ |
| 631 | /* The packet is locally destined, which requires a real |
| 632 | * dst_entry, so detach the fake one. On the way up, the |
| 633 | * packet would pass through PRE_ROUTING again (which already |
| 634 | * took place when the packet entered the bridge), but we |
| 635 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will |
| 636 | * prevent this from happening. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 637 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
| 638 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 639 | const struct net_device *in, |
| 640 | const struct net_device *out, |
| 641 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | { |
Peter Huang (Peng) | a881e96 | 2012-04-19 20:12:51 +0000 | [diff] [blame] | 643 | br_drop_fake_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | return NF_ACCEPT; |
| 645 | } |
| 646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | /* PF_BRIDGE/FORWARD *************************************************/ |
| 648 | static int br_nf_forward_finish(struct sk_buff *skb) |
| 649 | { |
| 650 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 651 | struct net_device *in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 653 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | in = nf_bridge->physindev; |
| 655 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 656 | skb->pkt_type = PACKET_OTHERHOST; |
| 657 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 658 | } |
Bart De Schuymer | e94c674 | 2010-05-13 14:55:34 +0200 | [diff] [blame] | 659 | nf_bridge_update_protocol(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | } else { |
| 661 | in = *((struct net_device **)(skb->cb)); |
| 662 | } |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 663 | nf_bridge_push_encap_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 664 | |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 665 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 666 | skb->dev, br_forward_finish, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return 0; |
| 668 | } |
| 669 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
| 672 | * netfilter with indev and outdev set to the bridge device, |
| 673 | * but we are still able to filter on the 'real' indev/outdev |
| 674 | * because of the physdev module. For ARP, indev and outdev are the |
| 675 | * bridge ports. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 676 | static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops, |
| 677 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 678 | const struct net_device *in, |
| 679 | const struct net_device *out, |
| 680 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | struct nf_bridge_info *nf_bridge; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 683 | struct net_device *parent; |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 684 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | |
| 686 | if (!skb->nf_bridge) |
| 687 | return NF_ACCEPT; |
| 688 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 689 | /* Need exclusive nf_bridge_info since we might have multiple |
| 690 | * different physoutdevs. */ |
| 691 | if (!nf_bridge_unshare(skb)) |
| 692 | return NF_DROP; |
| 693 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 694 | parent = bridge_parent(out); |
| 695 | if (!parent) |
| 696 | return NF_DROP; |
| 697 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 698 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 699 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 700 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 701 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 702 | else |
| 703 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 705 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | nf_bridge = skb->nf_bridge; |
| 708 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 709 | skb->pkt_type = PACKET_HOST; |
| 710 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 711 | } |
| 712 | |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 713 | if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb)) |
Herbert Xu | 6b1e960 | 2011-03-18 05:27:28 +0000 | [diff] [blame] | 714 | return NF_DROP; |
| 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | /* The physdev module checks on this */ |
| 717 | nf_bridge->mask |= BRNF_BRIDGED; |
| 718 | nf_bridge->physoutdev = skb->dev; |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 719 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 720 | skb->protocol = htons(ETH_P_IP); |
| 721 | else |
| 722 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 724 | NF_HOOK(pf, NF_INET_FORWARD, skb, brnf_get_logical_dev(skb, in), parent, |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 725 | br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
| 727 | return NF_STOLEN; |
| 728 | } |
| 729 | |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 730 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
| 731 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 732 | const struct net_device *in, |
| 733 | const struct net_device *out, |
| 734 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 736 | struct net_bridge_port *p; |
| 737 | struct net_bridge *br; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | struct net_device **d = (struct net_device **)(skb->cb); |
| 739 | |
David S. Miller | e490c1de | 2010-07-02 22:42:06 -0700 | [diff] [blame] | 740 | p = br_port_get_rcu(out); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 741 | if (p == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 743 | br = p->br; |
| 744 | |
| 745 | if (!brnf_call_arptables && !br->nf_call_arptables) |
| 746 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 748 | if (!IS_ARP(skb)) { |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 749 | if (!IS_VLAN_ARP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | return NF_ACCEPT; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 751 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | } |
| 753 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 754 | if (arp_hdr(skb)->ar_pln != 4) { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 755 | if (IS_VLAN_ARP(skb)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 756 | nf_bridge_push_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | return NF_ACCEPT; |
| 758 | } |
| 759 | *d = (struct net_device *)in; |
Jan Engelhardt | fdc9314 | 2008-10-20 03:34:51 -0700 | [diff] [blame] | 760 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | (struct net_device *)out, br_nf_forward_finish); |
| 762 | |
| 763 | return NF_STOLEN; |
| 764 | } |
| 765 | |
Vasily Averin | aff09ce | 2014-05-05 00:17:48 +0400 | [diff] [blame] | 766 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame^] | 767 | static bool nf_bridge_copy_header(struct sk_buff *skb) |
| 768 | { |
| 769 | int err; |
| 770 | unsigned int header_size; |
| 771 | |
| 772 | nf_bridge_update_protocol(skb); |
| 773 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
| 774 | err = skb_cow_head(skb, header_size); |
| 775 | if (err) |
| 776 | return false; |
| 777 | |
| 778 | skb_copy_to_linear_data_offset(skb, -header_size, |
| 779 | skb->nf_bridge->data, header_size); |
| 780 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
| 781 | return true; |
| 782 | } |
| 783 | |
| 784 | static int br_nf_push_frag_xmit(struct sk_buff *skb) |
| 785 | { |
| 786 | if (!nf_bridge_copy_header(skb)) { |
| 787 | kfree_skb(skb); |
| 788 | return 0; |
| 789 | } |
| 790 | |
| 791 | return br_dev_queue_push_xmit(skb); |
| 792 | } |
| 793 | |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 794 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
| 795 | { |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 796 | int ret; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 797 | int frag_max_size; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 798 | |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 799 | /* This is wrong! We should preserve the original fragment |
| 800 | * boundaries by preserving frag_list rather than refragmenting. |
| 801 | */ |
Vasily Averin | aff09ce | 2014-05-05 00:17:48 +0400 | [diff] [blame] | 802 | if (skb->protocol == htons(ETH_P_IP) && |
Bart De Schuymer | 6c79bf0 | 2010-04-20 16:22:01 +0200 | [diff] [blame] | 803 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
David S. Miller | 87f94b4 | 2010-09-01 18:06:39 -0700 | [diff] [blame] | 804 | !skb_is_gso(skb)) { |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 805 | frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 806 | if (br_parse_ip_options(skb)) |
| 807 | /* Drop invalid packet */ |
| 808 | return NF_DROP; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 809 | IPCB(skb)->frag_max_size = frag_max_size; |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame^] | 810 | ret = ip_fragment(skb, br_nf_push_frag_xmit); |
David S. Miller | 87f94b4 | 2010-09-01 18:06:39 -0700 | [diff] [blame] | 811 | } else |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 812 | ret = br_dev_queue_push_xmit(skb); |
| 813 | |
| 814 | return ret; |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 815 | } |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 816 | #else |
| 817 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
| 818 | { |
| 819 | return br_dev_queue_push_xmit(skb); |
| 820 | } |
| 821 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
| 823 | /* PF_BRIDGE/POST_ROUTING ********************************************/ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 824 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
| 825 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 826 | const struct net_device *in, |
| 827 | const struct net_device *out, |
| 828 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 830 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | struct net_device *realoutdev = bridge_parent(skb->dev); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 832 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 834 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
Patrick McHardy | 81d9dda | 2007-11-13 02:58:44 -0800 | [diff] [blame] | 835 | return NF_ACCEPT; |
| 836 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 837 | if (!realoutdev) |
| 838 | return NF_DROP; |
| 839 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 840 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 841 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 842 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 843 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 844 | else |
| 845 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
| 848 | * about the value of skb->pkt_type. */ |
| 849 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 850 | skb->pkt_type = PACKET_HOST; |
| 851 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 852 | } |
| 853 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 854 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | nf_bridge_save_header(skb); |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 856 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 857 | skb->protocol = htons(ETH_P_IP); |
| 858 | else |
| 859 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 861 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 862 | br_nf_dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | } |
| 866 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | /* IP/SABOTAGE *****************************************************/ |
| 868 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING |
| 869 | * for the second time. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 870 | static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops, |
| 871 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 872 | const struct net_device *in, |
| 873 | const struct net_device *out, |
| 874 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 876 | if (skb->nf_bridge && |
| 877 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | return NF_STOP; |
| 879 | } |
| 880 | |
| 881 | return NF_ACCEPT; |
| 882 | } |
| 883 | |
Pablo Neira Ayuso | 4b7fd5d | 2014-10-02 11:13:21 +0200 | [diff] [blame] | 884 | void br_netfilter_enable(void) |
| 885 | { |
| 886 | } |
| 887 | EXPORT_SYMBOL_GPL(br_netfilter_enable); |
| 888 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 889 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
| 890 | * br_dev_queue_push_xmit is called afterwards */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 891 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 892 | { |
| 893 | .hook = br_nf_pre_routing, |
| 894 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 895 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 896 | .hooknum = NF_BR_PRE_ROUTING, |
| 897 | .priority = NF_BR_PRI_BRNF, |
| 898 | }, |
| 899 | { |
| 900 | .hook = br_nf_local_in, |
| 901 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 902 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 903 | .hooknum = NF_BR_LOCAL_IN, |
| 904 | .priority = NF_BR_PRI_BRNF, |
| 905 | }, |
| 906 | { |
| 907 | .hook = br_nf_forward_ip, |
| 908 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 909 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 910 | .hooknum = NF_BR_FORWARD, |
| 911 | .priority = NF_BR_PRI_BRNF - 1, |
| 912 | }, |
| 913 | { |
| 914 | .hook = br_nf_forward_arp, |
| 915 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 916 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 917 | .hooknum = NF_BR_FORWARD, |
| 918 | .priority = NF_BR_PRI_BRNF, |
| 919 | }, |
| 920 | { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 921 | .hook = br_nf_post_routing, |
| 922 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 923 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 924 | .hooknum = NF_BR_POST_ROUTING, |
| 925 | .priority = NF_BR_PRI_LAST, |
| 926 | }, |
| 927 | { |
| 928 | .hook = ip_sabotage_in, |
| 929 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 930 | .pf = NFPROTO_IPV4, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 931 | .hooknum = NF_INET_PRE_ROUTING, |
| 932 | .priority = NF_IP_PRI_FIRST, |
| 933 | }, |
| 934 | { |
| 935 | .hook = ip_sabotage_in, |
| 936 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 937 | .pf = NFPROTO_IPV6, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 938 | .hooknum = NF_INET_PRE_ROUTING, |
| 939 | .priority = NF_IP6_PRI_FIRST, |
| 940 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | }; |
| 942 | |
| 943 | #ifdef CONFIG_SYSCTL |
| 944 | static |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 945 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
tanxiaojun | 56b148e | 2013-12-19 13:28:13 +0800 | [diff] [blame] | 946 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | { |
| 948 | int ret; |
| 949 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 950 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | |
| 952 | if (write && *(int *)(ctl->data)) |
| 953 | *(int *)(ctl->data) = 1; |
| 954 | return ret; |
| 955 | } |
| 956 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 957 | static struct ctl_table brnf_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | .procname = "bridge-nf-call-arptables", |
| 960 | .data = &brnf_call_arptables, |
| 961 | .maxlen = sizeof(int), |
| 962 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 963 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | }, |
| 965 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | .procname = "bridge-nf-call-iptables", |
| 967 | .data = &brnf_call_iptables, |
| 968 | .maxlen = sizeof(int), |
| 969 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 970 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | }, |
| 972 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | .procname = "bridge-nf-call-ip6tables", |
| 974 | .data = &brnf_call_ip6tables, |
| 975 | .maxlen = sizeof(int), |
| 976 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 977 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | }, |
| 979 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | .procname = "bridge-nf-filter-vlan-tagged", |
| 981 | .data = &brnf_filter_vlan_tagged, |
| 982 | .maxlen = sizeof(int), |
| 983 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 984 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | }, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 986 | { |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 987 | .procname = "bridge-nf-filter-pppoe-tagged", |
| 988 | .data = &brnf_filter_pppoe_tagged, |
| 989 | .maxlen = sizeof(int), |
| 990 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 991 | .proc_handler = brnf_sysctl_call_tables, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 992 | }, |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 993 | { |
| 994 | .procname = "bridge-nf-pass-vlan-input-dev", |
| 995 | .data = &brnf_pass_vlan_indev, |
| 996 | .maxlen = sizeof(int), |
| 997 | .mode = 0644, |
| 998 | .proc_handler = brnf_sysctl_call_tables, |
| 999 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 1000 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | #endif |
| 1003 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1004 | static int __init br_netfilter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1006 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1008 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1009 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | return ret; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 1011 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 1013 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | if (brnf_sysctl_header == NULL) { |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 1015 | printk(KERN_WARNING |
| 1016 | "br_netfilter: can't register to sysctl.\n"); |
Geert Uytterhoeven | 9672723 | 2015-02-12 15:17:27 +0100 | [diff] [blame] | 1017 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
| 1018 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | } |
| 1020 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | return 0; |
| 1023 | } |
| 1024 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1025 | static void __exit br_netfilter_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1027 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | 5dd3df1 | 2012-04-19 13:24:33 +0000 | [diff] [blame] | 1029 | unregister_net_sysctl_table(brnf_sysctl_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | } |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1032 | |
| 1033 | module_init(br_netfilter_init); |
| 1034 | module_exit(br_netfilter_fini); |
| 1035 | |
| 1036 | MODULE_LICENSE("GPL"); |
| 1037 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); |
| 1038 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); |
| 1039 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |