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> |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include "br_private.h" |
| 41 | #ifdef CONFIG_SYSCTL |
| 42 | #include <linux/sysctl.h> |
| 43 | #endif |
| 44 | |
| 45 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ |
| 46 | (skb->nf_bridge->data))->daddr.ipv4) |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 47 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
| 48 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #ifdef CONFIG_SYSCTL |
| 51 | static struct ctl_table_header *brnf_sysctl_header; |
Brian Haley | 9c1ea14 | 2006-09-18 00:03:41 -0700 | [diff] [blame] | 52 | static int brnf_call_iptables __read_mostly = 1; |
| 53 | static int brnf_call_ip6tables __read_mostly = 1; |
| 54 | static int brnf_call_arptables __read_mostly = 1; |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 55 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
| 56 | static int brnf_filter_pppoe_tagged __read_mostly = 0; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 57 | static int brnf_pass_vlan_indev __read_mostly = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #else |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 59 | #define brnf_call_iptables 1 |
| 60 | #define brnf_call_ip6tables 1 |
| 61 | #define brnf_call_arptables 1 |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 62 | #define brnf_filter_vlan_tagged 0 |
| 63 | #define brnf_filter_pppoe_tagged 0 |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 64 | #define brnf_pass_vlan_indev 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #endif |
| 66 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 67 | #define IS_IP(skb) \ |
| 68 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) |
| 69 | |
| 70 | #define IS_IPV6(skb) \ |
| 71 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) |
| 72 | |
| 73 | #define IS_ARP(skb) \ |
| 74 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) |
| 75 | |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 76 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 77 | { |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 78 | if (vlan_tx_tag_present(skb)) |
| 79 | return skb->protocol; |
| 80 | else if (skb->protocol == htons(ETH_P_8021Q)) |
| 81 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; |
| 82 | else |
| 83 | return 0; |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | #define IS_VLAN_IP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 87 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 88 | brnf_filter_vlan_tagged) |
| 89 | |
| 90 | #define IS_VLAN_IPV6(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 91 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 92 | brnf_filter_vlan_tagged) |
| 93 | |
| 94 | #define IS_VLAN_ARP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 95 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 96 | brnf_filter_vlan_tagged) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 98 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
| 99 | { |
| 100 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + |
| 101 | sizeof(struct pppoe_hdr))); |
| 102 | } |
| 103 | |
| 104 | #define IS_PPPOE_IP(skb) \ |
| 105 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 106 | pppoe_proto(skb) == htons(PPP_IP) && \ |
| 107 | brnf_filter_pppoe_tagged) |
| 108 | |
| 109 | #define IS_PPPOE_IPV6(skb) \ |
| 110 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 111 | pppoe_proto(skb) == htons(PPP_IPV6) && \ |
| 112 | brnf_filter_pppoe_tagged) |
| 113 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 114 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
| 115 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 116 | struct net_bridge_port *port; |
| 117 | |
| 118 | port = br_port_get_rcu(dev); |
| 119 | return port ? &port->br->fake_rtable : NULL; |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 120 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 122 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
| 123 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 124 | struct net_bridge_port *port; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 125 | |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 126 | port = br_port_get_rcu(dev); |
| 127 | return port ? port->br->dev : NULL; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 128 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 130 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
| 131 | { |
| 132 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); |
| 133 | if (likely(skb->nf_bridge)) |
| 134 | atomic_set(&(skb->nf_bridge->use), 1); |
| 135 | |
| 136 | return skb->nf_bridge; |
| 137 | } |
| 138 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 139 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
| 140 | { |
| 141 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 142 | |
| 143 | if (atomic_read(&nf_bridge->use) > 1) { |
| 144 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); |
| 145 | |
| 146 | if (tmp) { |
| 147 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); |
| 148 | atomic_set(&tmp->use, 1); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 149 | } |
Changli Gao | 4c3a76a | 2010-08-22 19:03:26 +0000 | [diff] [blame] | 150 | nf_bridge_put(nf_bridge); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 151 | nf_bridge = tmp; |
| 152 | } |
| 153 | return nf_bridge; |
| 154 | } |
| 155 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 156 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
| 157 | { |
| 158 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 159 | |
| 160 | skb_push(skb, len); |
| 161 | skb->network_header -= len; |
| 162 | } |
| 163 | |
| 164 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
| 165 | { |
| 166 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 167 | |
| 168 | skb_pull(skb, len); |
| 169 | skb->network_header += len; |
| 170 | } |
| 171 | |
| 172 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
| 173 | { |
| 174 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 175 | |
| 176 | skb_pull_rcsum(skb, len); |
| 177 | skb->network_header += len; |
| 178 | } |
| 179 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 180 | static inline void nf_bridge_save_header(struct sk_buff *skb) |
| 181 | { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 182 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 183 | |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 184 | skb_copy_from_linear_data_offset(skb, -header_size, |
| 185 | skb->nf_bridge->data, header_size); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 186 | } |
| 187 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 188 | /* When handing a packet over to the IP layer |
| 189 | * check whether we have a skb that is in the |
| 190 | * expected format |
| 191 | */ |
| 192 | |
stephen hemminger | d028023 | 2010-10-18 14:03:21 +0000 | [diff] [blame] | 193 | static int br_parse_ip_options(struct sk_buff *skb) |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 194 | { |
| 195 | struct ip_options *opt; |
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); |
| 204 | opt = &(IPCB(skb)->opt); |
| 205 | |
| 206 | /* Basic sanity checks */ |
| 207 | if (iph->ihl < 5 || iph->version != 4) |
| 208 | goto inhdr_error; |
| 209 | |
| 210 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 211 | goto inhdr_error; |
| 212 | |
| 213 | iph = ip_hdr(skb); |
| 214 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
| 215 | goto inhdr_error; |
| 216 | |
| 217 | len = ntohs(iph->tot_len); |
| 218 | if (skb->len < len) { |
| 219 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); |
| 220 | goto drop; |
| 221 | } else if (len < (iph->ihl*4)) |
| 222 | goto inhdr_error; |
| 223 | |
| 224 | if (pskb_trim_rcsum(skb, len)) { |
| 225 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
| 226 | goto drop; |
| 227 | } |
| 228 | |
Eric Dumazet | f8e9881 | 2011-04-12 13:39:14 -0700 | [diff] [blame] | 229 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
| 230 | if (iph->ihl == 5) |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 231 | return 0; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 232 | |
| 233 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); |
| 234 | if (ip_options_compile(dev_net(dev), opt, skb)) |
| 235 | goto inhdr_error; |
| 236 | |
| 237 | /* Check correct handling of SRR option */ |
| 238 | if (unlikely(opt->srr)) { |
| 239 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
| 240 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) |
| 241 | goto drop; |
| 242 | |
| 243 | if (ip_options_rcv_srr(skb)) |
| 244 | goto drop; |
| 245 | } |
| 246 | |
| 247 | return 0; |
| 248 | |
| 249 | inhdr_error: |
| 250 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); |
| 251 | drop: |
| 252 | return -1; |
| 253 | } |
| 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
| 256 | /* Undo the changes made for ip6tables PREROUTING and continue the |
| 257 | * bridge PRE_ROUTING hook. */ |
| 258 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) |
| 259 | { |
| 260 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 261 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 264 | skb->pkt_type = PACKET_OTHERHOST; |
| 265 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 266 | } |
| 267 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
| 268 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 269 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 270 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 271 | kfree_skb(skb); |
| 272 | return 0; |
| 273 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 274 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 277 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 278 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 279 | 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] | 280 | br_handle_frame_finish, 1); |
| 281 | |
| 282 | return 0; |
| 283 | } |
| 284 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 285 | /* Obtain the correct destination MAC address, while preserving the original |
| 286 | * source MAC address. If we already know this address, we just copy it. If we |
| 287 | * don't, we use the neighbour framework to find out. In both cases, we make |
| 288 | * sure that br_handle_frame_finish() is called afterwards. |
| 289 | */ |
| 290 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
| 291 | { |
| 292 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 293 | struct neighbour *neigh; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 294 | struct dst_entry *dst; |
| 295 | |
| 296 | skb->dev = bridge_parent(skb->dev); |
| 297 | if (!skb->dev) |
| 298 | goto free_skb; |
| 299 | dst = skb_dst(skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 300 | neigh = dst_neigh_lookup_skb(dst, skb); |
| 301 | if (neigh) { |
| 302 | int ret; |
| 303 | |
| 304 | if (neigh->hh.hh_len) { |
| 305 | neigh_hh_bridge(&neigh->hh, skb); |
| 306 | skb->dev = nf_bridge->physindev; |
| 307 | ret = br_handle_frame_finish(skb); |
| 308 | } else { |
| 309 | /* the neighbour function below overwrites the complete |
| 310 | * MAC header, so we save the Ethernet source address and |
| 311 | * protocol number. |
| 312 | */ |
| 313 | skb_copy_from_linear_data_offset(skb, |
| 314 | -(ETH_HLEN-ETH_ALEN), |
| 315 | skb->nf_bridge->data, |
| 316 | ETH_HLEN-ETH_ALEN); |
| 317 | /* tell br_dev_xmit to continue with forwarding */ |
| 318 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; |
| 319 | ret = neigh->output(neigh, skb); |
| 320 | } |
| 321 | neigh_release(neigh); |
| 322 | return ret; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 323 | } |
| 324 | free_skb: |
| 325 | kfree_skb(skb); |
| 326 | return 0; |
| 327 | } |
| 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | /* This requires some explaining. If DNAT has taken place, |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 330 | * we will need to fix up the destination Ethernet address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | * |
| 332 | * There are two cases to consider: |
| 333 | * 1. The packet was DNAT'ed to a device in the same bridge |
| 334 | * port group as it was received on. We can still bridge |
| 335 | * the packet. |
| 336 | * 2. The packet was DNAT'ed to a different device, either |
| 337 | * a non-bridged device or another bridge port group. |
| 338 | * The packet will need to be routed. |
| 339 | * |
| 340 | * The correct way of distinguishing between these two cases is to |
| 341 | * call ip_route_input() and to look at skb->dst->dev, which is |
| 342 | * changed to the destination device if ip_route_input() succeeds. |
| 343 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 344 | * Let's first consider the case that ip_route_input() succeeds: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 346 | * If the output device equals the logical bridge device the packet |
| 347 | * came in on, we can consider this bridging. The corresponding MAC |
| 348 | * address will be obtained in br_nf_pre_routing_finish_bridge. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | * Otherwise, the packet is considered to be routed and we just |
| 350 | * change the destination MAC address so that the packet will |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 351 | * later be passed up to the IP stack to be routed. For a redirected |
| 352 | * packet, ip_route_input() will give back the localhost as output device, |
| 353 | * which differs from the bridge device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 355 | * Let's now consider the case that ip_route_input() fails: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | * |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 357 | * This can be because the destination address is martian, in which case |
| 358 | * the packet will be dropped. |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 359 | * If IP forwarding is disabled, ip_route_input() will fail, while |
| 360 | * ip_route_output_key() can return success. The source |
| 361 | * 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] | 362 | * 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] | 363 | * if IP forwarding is enabled. If the output device equals the logical bridge |
| 364 | * device, we proceed as if ip_route_input() succeeded. If it differs from the |
| 365 | * logical bridge port or if ip_route_output_key() fails we drop the packet. |
| 366 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
| 368 | { |
| 369 | struct net_device *dev = skb->dev; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 370 | struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 372 | struct rtable *rt; |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 373 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 376 | skb->pkt_type = PACKET_OTHERHOST; |
| 377 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 378 | } |
| 379 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | if (dnat_took_place(skb)) { |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 381 | 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] | 382 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 383 | |
| 384 | /* If err equals -EHOSTUNREACH the error is due to a |
| 385 | * martian destination or due to the fact that |
| 386 | * forwarding is disabled. For most martian packets, |
| 387 | * ip_route_output_key() will fail. It won't fail for 2 types of |
| 388 | * martian destinations: loopback destinations and destination |
| 389 | * 0.0.0.0. In both cases the packet will be dropped because the |
| 390 | * destination is the loopback device and not the bridge. */ |
| 391 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) |
| 392 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
David S. Miller | 78fbfd8 | 2011-03-12 00:00:52 -0500 | [diff] [blame] | 394 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
| 395 | RT_TOS(iph->tos), 0); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 396 | if (!IS_ERR(rt)) { |
Bart De Schuymer | 1c011be | 2005-09-14 20:55:16 -0700 | [diff] [blame] | 397 | /* - Bridged-and-DNAT'ed traffic doesn't |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 398 | * require ip_forwarding. */ |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 399 | if (rt->dst.dev == dev) { |
| 400 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | goto bridged_dnat; |
| 402 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 403 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 405 | free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | kfree_skb(skb); |
| 407 | return 0; |
| 408 | } else { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 409 | if (skb_dst(skb)->dev == dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | bridged_dnat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 412 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 413 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 414 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
| 415 | NF_BR_PRE_ROUTING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | skb, skb->dev, NULL, |
| 417 | br_nf_pre_routing_finish_bridge, |
| 418 | 1); |
| 419 | return 0; |
| 420 | } |
Joe Perches | 0409114 | 2014-02-23 00:05:26 -0800 | [diff] [blame] | 421 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | skb->pkt_type = PACKET_HOST; |
| 423 | } |
| 424 | } else { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 425 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 426 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 427 | kfree_skb(skb); |
| 428 | return 0; |
| 429 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 430 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 434 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 435 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 436 | 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] | 437 | br_handle_frame_finish, 1); |
| 438 | |
| 439 | return 0; |
| 440 | } |
| 441 | |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 442 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
| 443 | { |
| 444 | struct net_device *vlan, *br; |
| 445 | |
| 446 | br = bridge_parent(dev); |
| 447 | if (brnf_pass_vlan_indev == 0 || !vlan_tx_tag_present(skb)) |
| 448 | return br; |
| 449 | |
dingtianhong | f06c7f9 | 2014-05-09 14:58:05 +0800 | [diff] [blame] | 450 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
Patrick McHardy | 1fd9b1f | 2013-04-19 02:04:29 +0000 | [diff] [blame] | 451 | vlan_tx_tag_get(skb) & VLAN_VID_MASK); |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 452 | |
| 453 | return vlan ? vlan : br; |
| 454 | } |
| 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | /* Some common code for IPv4/IPv6 */ |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 457 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
| 459 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 460 | |
| 461 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 462 | skb->pkt_type = PACKET_HOST; |
| 463 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 464 | } |
| 465 | |
| 466 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; |
| 467 | nf_bridge->physindev = skb->dev; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 468 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 469 | if (skb->protocol == htons(ETH_P_8021Q)) |
| 470 | nf_bridge->mask |= BRNF_8021Q; |
| 471 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
| 472 | nf_bridge->mask |= BRNF_PPPoE; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 473 | |
Florian Westphal | 6b8dbcf | 2013-10-24 21:32:42 +0200 | [diff] [blame] | 474 | /* Must drop socket now because of tproxy. */ |
| 475 | skb_orphan(skb); |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 476 | return skb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ |
| 480 | static int check_hbh_len(struct sk_buff *skb) |
| 481 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 482 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | u32 pkt_len; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 484 | const unsigned char *nh = skb_network_header(skb); |
| 485 | int off = raw - nh; |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 486 | int len = (raw[1] + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
| 488 | if ((raw + len) - skb->data > skb_headlen(skb)) |
| 489 | goto bad; |
| 490 | |
| 491 | off += 2; |
| 492 | len -= 2; |
| 493 | |
| 494 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 495 | int optlen = nh[off + 1] + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 497 | switch (nh[off]) { |
Eldad Zack | 1de5a71 | 2012-05-17 06:00:25 +0000 | [diff] [blame] | 498 | case IPV6_TLV_PAD1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | optlen = 1; |
| 500 | break; |
| 501 | |
| 502 | case IPV6_TLV_PADN: |
| 503 | break; |
| 504 | |
| 505 | case IPV6_TLV_JUMBO: |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 506 | if (nh[off + 1] != 4 || (off & 3) != 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 508 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 509 | if (pkt_len <= IPV6_MAXPLEN || |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 510 | ipv6_hdr(skb)->payload_len) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 511 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
| 513 | goto bad; |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 514 | if (pskb_trim_rcsum(skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 515 | pkt_len + sizeof(struct ipv6hdr))) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 516 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 517 | nh = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | break; |
| 519 | default: |
| 520 | if (optlen > len) |
| 521 | goto bad; |
| 522 | break; |
| 523 | } |
| 524 | off += optlen; |
| 525 | len -= optlen; |
| 526 | } |
| 527 | if (len == 0) |
| 528 | return 0; |
| 529 | bad: |
| 530 | return -1; |
| 531 | |
| 532 | } |
| 533 | |
| 534 | /* Replicate the checks that IPv6 does on packet reception and pass the packet |
| 535 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 536 | 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] | 537 | struct sk_buff *skb, |
| 538 | const struct net_device *in, |
| 539 | const struct net_device *out, |
| 540 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 542 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | u32 pkt_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
| 545 | if (skb->len < sizeof(struct ipv6hdr)) |
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 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 549 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 551 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
| 553 | if (hdr->version != 6) |
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 | pkt_len = ntohs(hdr->payload_len); |
| 557 | |
| 558 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
| 559 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 560 | return NF_DROP; |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 561 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 562 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 565 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 567 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 568 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 570 | if (!setup_pre_routing(skb)) |
| 571 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 573 | skb->protocol = htons(ETH_P_IPV6); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 574 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | br_nf_pre_routing_finish_ipv6); |
| 576 | |
| 577 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | } |
| 579 | |
| 580 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
| 581 | * Replicate the checks that IPv4 does on packet reception. |
| 582 | * Set skb->dev to the bridge device (i.e. parent of the |
| 583 | * receiving device) to make netfilter happy, the REDIRECT |
| 584 | * target in particular. Save the original destination IP |
| 585 | * address to be able to detect DNAT afterwards. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 586 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
| 587 | struct sk_buff *skb, |
Stephen Hemminger | ee02b3a | 2006-01-06 13:13:29 -0800 | [diff] [blame] | 588 | const struct net_device *in, |
| 589 | const struct net_device *out, |
| 590 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 592 | struct net_bridge_port *p; |
| 593 | struct net_bridge *br; |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 594 | __u32 len = nf_bridge_encap_header_len(skb); |
| 595 | |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 596 | if (unlikely(!pskb_may_pull(skb, len))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 597 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
David S. Miller | e490c1de | 2010-07-02 22:42:06 -0700 | [diff] [blame] | 599 | p = br_port_get_rcu(in); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 600 | if (p == NULL) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 601 | return NF_DROP; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 602 | br = p->br; |
| 603 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 604 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 605 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 607 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 608 | nf_bridge_pull_encap_header_rcsum(skb); |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 609 | return br_nf_pre_routing_ipv6(ops, skb, in, out, okfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | } |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 611 | |
| 612 | if (!brnf_call_iptables && !br->nf_call_iptables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 615 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | return NF_ACCEPT; |
| 617 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 618 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 620 | if (br_parse_ip_options(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 621 | return NF_DROP; |
Herbert Xu | 1776206 | 2010-07-05 21:29:28 +0000 | [diff] [blame] | 622 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 623 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 624 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 626 | if (!setup_pre_routing(skb)) |
| 627 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | store_orig_dstaddr(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 629 | skb->protocol = htons(ETH_P_IP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 631 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | br_nf_pre_routing_finish); |
| 633 | |
| 634 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | |
| 638 | /* PF_BRIDGE/LOCAL_IN ************************************************/ |
| 639 | /* The packet is locally destined, which requires a real |
| 640 | * dst_entry, so detach the fake one. On the way up, the |
| 641 | * packet would pass through PRE_ROUTING again (which already |
| 642 | * took place when the packet entered the bridge), but we |
| 643 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will |
| 644 | * prevent this from happening. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 645 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
| 646 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 647 | const struct net_device *in, |
| 648 | const struct net_device *out, |
| 649 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | { |
Peter Huang (Peng) | a881e96 | 2012-04-19 20:12:51 +0000 | [diff] [blame] | 651 | br_drop_fake_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | return NF_ACCEPT; |
| 653 | } |
| 654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | /* PF_BRIDGE/FORWARD *************************************************/ |
| 656 | static int br_nf_forward_finish(struct sk_buff *skb) |
| 657 | { |
| 658 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 659 | struct net_device *in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 661 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | in = nf_bridge->physindev; |
| 663 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 664 | skb->pkt_type = PACKET_OTHERHOST; |
| 665 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 666 | } |
Bart De Schuymer | e94c674 | 2010-05-13 14:55:34 +0200 | [diff] [blame] | 667 | nf_bridge_update_protocol(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } else { |
| 669 | in = *((struct net_device **)(skb->cb)); |
| 670 | } |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 671 | nf_bridge_push_encap_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 672 | |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 673 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 674 | skb->dev, br_forward_finish, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | return 0; |
| 676 | } |
| 677 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
| 680 | * netfilter with indev and outdev set to the bridge device, |
| 681 | * but we are still able to filter on the 'real' indev/outdev |
| 682 | * because of the physdev module. For ARP, indev and outdev are the |
| 683 | * bridge ports. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 684 | static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops, |
| 685 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 686 | const struct net_device *in, |
| 687 | const struct net_device *out, |
| 688 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | struct nf_bridge_info *nf_bridge; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 691 | struct net_device *parent; |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 692 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
| 694 | if (!skb->nf_bridge) |
| 695 | return NF_ACCEPT; |
| 696 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 697 | /* Need exclusive nf_bridge_info since we might have multiple |
| 698 | * different physoutdevs. */ |
| 699 | if (!nf_bridge_unshare(skb)) |
| 700 | return NF_DROP; |
| 701 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 702 | parent = bridge_parent(out); |
| 703 | if (!parent) |
| 704 | return NF_DROP; |
| 705 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 706 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 707 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 708 | 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] | 709 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 710 | else |
| 711 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 713 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | nf_bridge = skb->nf_bridge; |
| 716 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 717 | skb->pkt_type = PACKET_HOST; |
| 718 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 719 | } |
| 720 | |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 721 | if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb)) |
Herbert Xu | 6b1e960 | 2011-03-18 05:27:28 +0000 | [diff] [blame] | 722 | return NF_DROP; |
| 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | /* The physdev module checks on this */ |
| 725 | nf_bridge->mask |= BRNF_BRIDGED; |
| 726 | nf_bridge->physoutdev = skb->dev; |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 727 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 728 | skb->protocol = htons(ETH_P_IP); |
| 729 | else |
| 730 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 732 | 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] | 733 | br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
| 735 | return NF_STOLEN; |
| 736 | } |
| 737 | |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 738 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
| 739 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 740 | const struct net_device *in, |
| 741 | const struct net_device *out, |
| 742 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 744 | struct net_bridge_port *p; |
| 745 | struct net_bridge *br; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | struct net_device **d = (struct net_device **)(skb->cb); |
| 747 | |
David S. Miller | e490c1de | 2010-07-02 22:42:06 -0700 | [diff] [blame] | 748 | p = br_port_get_rcu(out); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 749 | if (p == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 751 | br = p->br; |
| 752 | |
| 753 | if (!brnf_call_arptables && !br->nf_call_arptables) |
| 754 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 756 | if (!IS_ARP(skb)) { |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 757 | if (!IS_VLAN_ARP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | return NF_ACCEPT; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 759 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | } |
| 761 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 762 | if (arp_hdr(skb)->ar_pln != 4) { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 763 | if (IS_VLAN_ARP(skb)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 764 | nf_bridge_push_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | return NF_ACCEPT; |
| 766 | } |
| 767 | *d = (struct net_device *)in; |
Jan Engelhardt | fdc9314 | 2008-10-20 03:34:51 -0700 | [diff] [blame] | 768 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | (struct net_device *)out, br_nf_forward_finish); |
| 770 | |
| 771 | return NF_STOLEN; |
| 772 | } |
| 773 | |
Vasily Averin | aff09ce | 2014-05-05 00:17:48 +0400 | [diff] [blame] | 774 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 775 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
| 776 | { |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 777 | int ret; |
| 778 | |
Vasily Averin | aff09ce | 2014-05-05 00:17:48 +0400 | [diff] [blame] | 779 | if (skb->protocol == htons(ETH_P_IP) && |
Bart De Schuymer | 6c79bf0 | 2010-04-20 16:22:01 +0200 | [diff] [blame] | 780 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
David S. Miller | 87f94b4 | 2010-09-01 18:06:39 -0700 | [diff] [blame] | 781 | !skb_is_gso(skb)) { |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 782 | if (br_parse_ip_options(skb)) |
| 783 | /* Drop invalid packet */ |
| 784 | return NF_DROP; |
| 785 | ret = ip_fragment(skb, br_dev_queue_push_xmit); |
David S. Miller | 87f94b4 | 2010-09-01 18:06:39 -0700 | [diff] [blame] | 786 | } else |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 787 | ret = br_dev_queue_push_xmit(skb); |
| 788 | |
| 789 | return ret; |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 790 | } |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 791 | #else |
| 792 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
| 793 | { |
| 794 | return br_dev_queue_push_xmit(skb); |
| 795 | } |
| 796 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | /* PF_BRIDGE/POST_ROUTING ********************************************/ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 799 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
| 800 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 801 | const struct net_device *in, |
| 802 | const struct net_device *out, |
| 803 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 805 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | struct net_device *realoutdev = bridge_parent(skb->dev); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 807 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 809 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
Patrick McHardy | 81d9dda | 2007-11-13 02:58:44 -0800 | [diff] [blame] | 810 | return NF_ACCEPT; |
| 811 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 812 | if (!realoutdev) |
| 813 | return NF_DROP; |
| 814 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 815 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 816 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 817 | 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] | 818 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 819 | else |
| 820 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
| 823 | * about the value of skb->pkt_type. */ |
| 824 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 825 | skb->pkt_type = PACKET_HOST; |
| 826 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 827 | } |
| 828 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 829 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | nf_bridge_save_header(skb); |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 831 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 832 | skb->protocol = htons(ETH_P_IP); |
| 833 | else |
| 834 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 836 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 837 | br_nf_dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
| 839 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
| 841 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | /* IP/SABOTAGE *****************************************************/ |
| 843 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING |
| 844 | * for the second time. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 845 | static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops, |
| 846 | struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 847 | const struct net_device *in, |
| 848 | const struct net_device *out, |
| 849 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 851 | if (skb->nf_bridge && |
| 852 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | return NF_STOP; |
| 854 | } |
| 855 | |
| 856 | return NF_ACCEPT; |
| 857 | } |
| 858 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 859 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
| 860 | * br_dev_queue_push_xmit is called afterwards */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 861 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 862 | { |
| 863 | .hook = br_nf_pre_routing, |
| 864 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 865 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 866 | .hooknum = NF_BR_PRE_ROUTING, |
| 867 | .priority = NF_BR_PRI_BRNF, |
| 868 | }, |
| 869 | { |
| 870 | .hook = br_nf_local_in, |
| 871 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 872 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 873 | .hooknum = NF_BR_LOCAL_IN, |
| 874 | .priority = NF_BR_PRI_BRNF, |
| 875 | }, |
| 876 | { |
| 877 | .hook = br_nf_forward_ip, |
| 878 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 879 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 880 | .hooknum = NF_BR_FORWARD, |
| 881 | .priority = NF_BR_PRI_BRNF - 1, |
| 882 | }, |
| 883 | { |
| 884 | .hook = br_nf_forward_arp, |
| 885 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 886 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 887 | .hooknum = NF_BR_FORWARD, |
| 888 | .priority = NF_BR_PRI_BRNF, |
| 889 | }, |
| 890 | { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 891 | .hook = br_nf_post_routing, |
| 892 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 893 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 894 | .hooknum = NF_BR_POST_ROUTING, |
| 895 | .priority = NF_BR_PRI_LAST, |
| 896 | }, |
| 897 | { |
| 898 | .hook = ip_sabotage_in, |
| 899 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 900 | .pf = NFPROTO_IPV4, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 901 | .hooknum = NF_INET_PRE_ROUTING, |
| 902 | .priority = NF_IP_PRI_FIRST, |
| 903 | }, |
| 904 | { |
| 905 | .hook = ip_sabotage_in, |
| 906 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 907 | .pf = NFPROTO_IPV6, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 908 | .hooknum = NF_INET_PRE_ROUTING, |
| 909 | .priority = NF_IP6_PRI_FIRST, |
| 910 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | }; |
| 912 | |
| 913 | #ifdef CONFIG_SYSCTL |
| 914 | static |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 915 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
tanxiaojun | 56b148e | 2013-12-19 13:28:13 +0800 | [diff] [blame] | 916 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | { |
| 918 | int ret; |
| 919 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 920 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
| 922 | if (write && *(int *)(ctl->data)) |
| 923 | *(int *)(ctl->data) = 1; |
| 924 | return ret; |
| 925 | } |
| 926 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 927 | static struct ctl_table brnf_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | .procname = "bridge-nf-call-arptables", |
| 930 | .data = &brnf_call_arptables, |
| 931 | .maxlen = sizeof(int), |
| 932 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 933 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | }, |
| 935 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | .procname = "bridge-nf-call-iptables", |
| 937 | .data = &brnf_call_iptables, |
| 938 | .maxlen = sizeof(int), |
| 939 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 940 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | }, |
| 942 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | .procname = "bridge-nf-call-ip6tables", |
| 944 | .data = &brnf_call_ip6tables, |
| 945 | .maxlen = sizeof(int), |
| 946 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 947 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | }, |
| 949 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | .procname = "bridge-nf-filter-vlan-tagged", |
| 951 | .data = &brnf_filter_vlan_tagged, |
| 952 | .maxlen = sizeof(int), |
| 953 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 954 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | }, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 956 | { |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 957 | .procname = "bridge-nf-filter-pppoe-tagged", |
| 958 | .data = &brnf_filter_pppoe_tagged, |
| 959 | .maxlen = sizeof(int), |
| 960 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 961 | .proc_handler = brnf_sysctl_call_tables, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 962 | }, |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 963 | { |
| 964 | .procname = "bridge-nf-pass-vlan-input-dev", |
| 965 | .data = &brnf_pass_vlan_indev, |
| 966 | .maxlen = sizeof(int), |
| 967 | .mode = 0644, |
| 968 | .proc_handler = brnf_sysctl_call_tables, |
| 969 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 970 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | #endif |
| 973 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame^] | 974 | static int __init br_netfilter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 976 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame^] | 978 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 979 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | return ret; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 981 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 983 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | if (brnf_sysctl_header == NULL) { |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 985 | printk(KERN_WARNING |
| 986 | "br_netfilter: can't register to sysctl.\n"); |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame^] | 987 | ret = -ENOMEM; |
| 988 | goto err1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | } |
| 990 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | return 0; |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame^] | 993 | err1: |
| 994 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
| 995 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
| 997 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame^] | 998 | static void __exit br_netfilter_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1000 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | 5dd3df1 | 2012-04-19 13:24:33 +0000 | [diff] [blame] | 1002 | unregister_net_sysctl_table(brnf_sysctl_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | } |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame^] | 1005 | |
| 1006 | module_init(br_netfilter_init); |
| 1007 | module_exit(br_netfilter_fini); |
| 1008 | |
| 1009 | MODULE_LICENSE("GPL"); |
| 1010 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); |
| 1011 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); |
| 1012 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |