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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #else |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 58 | #define brnf_call_iptables 1 |
| 59 | #define brnf_call_ip6tables 1 |
| 60 | #define brnf_call_arptables 1 |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 61 | #define brnf_filter_vlan_tagged 0 |
| 62 | #define brnf_filter_pppoe_tagged 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #endif |
| 64 | |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 65 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 66 | { |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 67 | if (vlan_tx_tag_present(skb)) |
| 68 | return skb->protocol; |
| 69 | else if (skb->protocol == htons(ETH_P_8021Q)) |
| 70 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; |
| 71 | else |
| 72 | return 0; |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | #define IS_VLAN_IP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 76 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 77 | brnf_filter_vlan_tagged) |
| 78 | |
| 79 | #define IS_VLAN_IPV6(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 80 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 81 | brnf_filter_vlan_tagged) |
| 82 | |
| 83 | #define IS_VLAN_ARP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 84 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 85 | brnf_filter_vlan_tagged) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 87 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
| 88 | { |
| 89 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + |
| 90 | sizeof(struct pppoe_hdr))); |
| 91 | } |
| 92 | |
| 93 | #define IS_PPPOE_IP(skb) \ |
| 94 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 95 | pppoe_proto(skb) == htons(PPP_IP) && \ |
| 96 | brnf_filter_pppoe_tagged) |
| 97 | |
| 98 | #define IS_PPPOE_IPV6(skb) \ |
| 99 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 100 | pppoe_proto(skb) == htons(PPP_IPV6) && \ |
| 101 | brnf_filter_pppoe_tagged) |
| 102 | |
Herbert Xu | 631339f | 2008-11-24 16:06:50 -0800 | [diff] [blame] | 103 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 104 | { |
| 105 | } |
| 106 | |
| 107 | static struct dst_ops fake_dst_ops = { |
| 108 | .family = AF_INET, |
Harvey Harrison | 09640e6 | 2009-02-01 00:45:17 -0800 | [diff] [blame] | 109 | .protocol = cpu_to_be16(ETH_P_IP), |
Herbert Xu | 631339f | 2008-11-24 16:06:50 -0800 | [diff] [blame] | 110 | .update_pmtu = fake_update_pmtu, |
Herbert Xu | 631339f | 2008-11-24 16:06:50 -0800 | [diff] [blame] | 111 | }; |
| 112 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 113 | /* |
| 114 | * Initialize bogus route table used to keep netfilter happy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | * Currently, we fill in the PMTU entry because netfilter |
| 116 | * refragmentation needs it, and the rt_flags entry because |
| 117 | * ipt_REJECT needs it. Future netfilter modules might |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 118 | * require us to fill additional fields. |
| 119 | */ |
Eric Dumazet | 33eb987 | 2011-05-24 13:32:18 -0400 | [diff] [blame] | 120 | static const u32 br_dst_default_metrics[RTAX_MAX] = { |
| 121 | [RTAX_MTU - 1] = 1500, |
| 122 | }; |
| 123 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 124 | void br_netfilter_rtable_init(struct net_bridge *br) |
| 125 | { |
| 126 | struct rtable *rt = &br->fake_rtable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 128 | atomic_set(&rt->dst.__refcnt, 1); |
| 129 | rt->dst.dev = br->dev; |
| 130 | rt->dst.path = &rt->dst; |
Eric Dumazet | 33eb987 | 2011-05-24 13:32:18 -0400 | [diff] [blame] | 131 | dst_init_metrics(&rt->dst, br_dst_default_metrics, true); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 132 | rt->dst.flags = DST_NOXFRM; |
| 133 | rt->dst.ops = &fake_dst_ops; |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
| 137 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 138 | struct net_bridge_port *port; |
| 139 | |
| 140 | port = br_port_get_rcu(dev); |
| 141 | return port ? &port->br->fake_rtable : NULL; |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 142 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 144 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
| 145 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 146 | struct net_bridge_port *port; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 147 | |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 148 | port = br_port_get_rcu(dev); |
| 149 | return port ? port->br->dev : NULL; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 150 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 152 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
| 153 | { |
| 154 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); |
| 155 | if (likely(skb->nf_bridge)) |
| 156 | atomic_set(&(skb->nf_bridge->use), 1); |
| 157 | |
| 158 | return skb->nf_bridge; |
| 159 | } |
| 160 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 161 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
| 162 | { |
| 163 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 164 | |
| 165 | if (atomic_read(&nf_bridge->use) > 1) { |
| 166 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); |
| 167 | |
| 168 | if (tmp) { |
| 169 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); |
| 170 | atomic_set(&tmp->use, 1); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 171 | } |
Changli Gao | 4c3a76a | 2010-08-22 19:03:26 +0000 | [diff] [blame] | 172 | nf_bridge_put(nf_bridge); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 173 | nf_bridge = tmp; |
| 174 | } |
| 175 | return nf_bridge; |
| 176 | } |
| 177 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 178 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
| 179 | { |
| 180 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 181 | |
| 182 | skb_push(skb, len); |
| 183 | skb->network_header -= len; |
| 184 | } |
| 185 | |
| 186 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
| 187 | { |
| 188 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 189 | |
| 190 | skb_pull(skb, len); |
| 191 | skb->network_header += len; |
| 192 | } |
| 193 | |
| 194 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
| 195 | { |
| 196 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 197 | |
| 198 | skb_pull_rcsum(skb, len); |
| 199 | skb->network_header += len; |
| 200 | } |
| 201 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 202 | static inline void nf_bridge_save_header(struct sk_buff *skb) |
| 203 | { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 204 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 205 | |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 206 | skb_copy_from_linear_data_offset(skb, -header_size, |
| 207 | skb->nf_bridge->data, header_size); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 208 | } |
| 209 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 210 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
| 211 | { |
| 212 | if (skb->nf_bridge->mask & BRNF_8021Q) |
| 213 | skb->protocol = htons(ETH_P_8021Q); |
| 214 | else if (skb->nf_bridge->mask & BRNF_PPPoE) |
| 215 | skb->protocol = htons(ETH_P_PPP_SES); |
| 216 | } |
| 217 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 218 | /* When handing a packet over to the IP layer |
| 219 | * check whether we have a skb that is in the |
| 220 | * expected format |
| 221 | */ |
| 222 | |
stephen hemminger | d028023 | 2010-10-18 14:03:21 +0000 | [diff] [blame] | 223 | static int br_parse_ip_options(struct sk_buff *skb) |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 224 | { |
| 225 | struct ip_options *opt; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 226 | const struct iphdr *iph; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 227 | struct net_device *dev = skb->dev; |
| 228 | u32 len; |
| 229 | |
| 230 | iph = ip_hdr(skb); |
| 231 | opt = &(IPCB(skb)->opt); |
| 232 | |
| 233 | /* Basic sanity checks */ |
| 234 | if (iph->ihl < 5 || iph->version != 4) |
| 235 | goto inhdr_error; |
| 236 | |
| 237 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 238 | goto inhdr_error; |
| 239 | |
| 240 | iph = ip_hdr(skb); |
| 241 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
| 242 | goto inhdr_error; |
| 243 | |
| 244 | len = ntohs(iph->tot_len); |
| 245 | if (skb->len < len) { |
| 246 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); |
| 247 | goto drop; |
| 248 | } else if (len < (iph->ihl*4)) |
| 249 | goto inhdr_error; |
| 250 | |
| 251 | if (pskb_trim_rcsum(skb, len)) { |
| 252 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
| 253 | goto drop; |
| 254 | } |
| 255 | |
Eric Dumazet | f8e9881 | 2011-04-12 13:39:14 -0700 | [diff] [blame] | 256 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
| 257 | if (iph->ihl == 5) |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 258 | return 0; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 259 | |
| 260 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); |
| 261 | if (ip_options_compile(dev_net(dev), opt, skb)) |
| 262 | goto inhdr_error; |
| 263 | |
| 264 | /* Check correct handling of SRR option */ |
| 265 | if (unlikely(opt->srr)) { |
| 266 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
| 267 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) |
| 268 | goto drop; |
| 269 | |
| 270 | if (ip_options_rcv_srr(skb)) |
| 271 | goto drop; |
| 272 | } |
| 273 | |
| 274 | return 0; |
| 275 | |
| 276 | inhdr_error: |
| 277 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); |
| 278 | drop: |
| 279 | return -1; |
| 280 | } |
| 281 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 282 | /* Fill in the header for fragmented IP packets handled by |
| 283 | * the IPv4 connection tracking code. |
Stephen Hemminger | 07317621 | 2006-08-29 17:48:17 -0700 | [diff] [blame] | 284 | */ |
| 285 | int nf_bridge_copy_header(struct sk_buff *skb) |
| 286 | { |
| 287 | int err; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 288 | unsigned int header_size; |
Stephen Hemminger | 07317621 | 2006-08-29 17:48:17 -0700 | [diff] [blame] | 289 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 290 | nf_bridge_update_protocol(skb); |
| 291 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
Herbert Xu | d9cc204 | 2007-09-16 16:21:16 -0700 | [diff] [blame] | 292 | err = skb_cow_head(skb, header_size); |
Stephen Hemminger | 07317621 | 2006-08-29 17:48:17 -0700 | [diff] [blame] | 293 | if (err) |
| 294 | return err; |
| 295 | |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 296 | skb_copy_to_linear_data_offset(skb, -header_size, |
| 297 | skb->nf_bridge->data, header_size); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 298 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
Stephen Hemminger | 07317621 | 2006-08-29 17:48:17 -0700 | [diff] [blame] | 299 | return 0; |
| 300 | } |
| 301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
| 303 | /* Undo the changes made for ip6tables PREROUTING and continue the |
| 304 | * bridge PRE_ROUTING hook. */ |
| 305 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) |
| 306 | { |
| 307 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 308 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 311 | skb->pkt_type = PACKET_OTHERHOST; |
| 312 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 313 | } |
| 314 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
| 315 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 316 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 317 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 318 | kfree_skb(skb); |
| 319 | return 0; |
| 320 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 321 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 324 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 325 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 326 | 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] | 327 | br_handle_frame_finish, 1); |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 332 | /* Obtain the correct destination MAC address, while preserving the original |
| 333 | * source MAC address. If we already know this address, we just copy it. If we |
| 334 | * don't, we use the neighbour framework to find out. In both cases, we make |
| 335 | * sure that br_handle_frame_finish() is called afterwards. |
| 336 | */ |
| 337 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
| 338 | { |
| 339 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 340 | struct dst_entry *dst; |
| 341 | |
| 342 | skb->dev = bridge_parent(skb->dev); |
| 343 | if (!skb->dev) |
| 344 | goto free_skb; |
| 345 | dst = skb_dst(skb); |
| 346 | if (dst->hh) { |
| 347 | neigh_hh_bridge(dst->hh, skb); |
| 348 | skb->dev = nf_bridge->physindev; |
| 349 | return br_handle_frame_finish(skb); |
| 350 | } else if (dst->neighbour) { |
| 351 | /* the neighbour function below overwrites the complete |
| 352 | * MAC header, so we save the Ethernet source address and |
| 353 | * protocol number. */ |
| 354 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); |
| 355 | /* tell br_dev_xmit to continue with forwarding */ |
| 356 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; |
| 357 | return dst->neighbour->output(skb); |
| 358 | } |
| 359 | free_skb: |
| 360 | kfree_skb(skb); |
| 361 | return 0; |
| 362 | } |
| 363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | /* This requires some explaining. If DNAT has taken place, |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 365 | * we will need to fix up the destination Ethernet address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | * |
| 367 | * There are two cases to consider: |
| 368 | * 1. The packet was DNAT'ed to a device in the same bridge |
| 369 | * port group as it was received on. We can still bridge |
| 370 | * the packet. |
| 371 | * 2. The packet was DNAT'ed to a different device, either |
| 372 | * a non-bridged device or another bridge port group. |
| 373 | * The packet will need to be routed. |
| 374 | * |
| 375 | * The correct way of distinguishing between these two cases is to |
| 376 | * call ip_route_input() and to look at skb->dst->dev, which is |
| 377 | * changed to the destination device if ip_route_input() succeeds. |
| 378 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 379 | * Let's first consider the case that ip_route_input() succeeds: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 381 | * If the output device equals the logical bridge device the packet |
| 382 | * came in on, we can consider this bridging. The corresponding MAC |
| 383 | * address will be obtained in br_nf_pre_routing_finish_bridge. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | * Otherwise, the packet is considered to be routed and we just |
| 385 | * change the destination MAC address so that the packet will |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 386 | * later be passed up to the IP stack to be routed. For a redirected |
| 387 | * packet, ip_route_input() will give back the localhost as output device, |
| 388 | * which differs from the bridge device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 390 | * Let's now consider the case that ip_route_input() fails: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | * |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 392 | * This can be because the destination address is martian, in which case |
| 393 | * the packet will be dropped. |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 394 | * If IP forwarding is disabled, ip_route_input() will fail, while |
| 395 | * ip_route_output_key() can return success. The source |
| 396 | * 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] | 397 | * 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] | 398 | * if IP forwarding is enabled. If the output device equals the logical bridge |
| 399 | * device, we proceed as if ip_route_input() succeeded. If it differs from the |
| 400 | * logical bridge port or if ip_route_output_key() fails we drop the packet. |
| 401 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
| 403 | { |
| 404 | struct net_device *dev = skb->dev; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 405 | struct iphdr *iph = ip_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 407 | struct rtable *rt; |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 408 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 411 | skb->pkt_type = PACKET_OTHERHOST; |
| 412 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 413 | } |
| 414 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | if (dnat_took_place(skb)) { |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 416 | 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] | 417 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 418 | |
| 419 | /* If err equals -EHOSTUNREACH the error is due to a |
| 420 | * martian destination or due to the fact that |
| 421 | * forwarding is disabled. For most martian packets, |
| 422 | * ip_route_output_key() will fail. It won't fail for 2 types of |
| 423 | * martian destinations: loopback destinations and destination |
| 424 | * 0.0.0.0. In both cases the packet will be dropped because the |
| 425 | * destination is the loopback device and not the bridge. */ |
| 426 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) |
| 427 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
David S. Miller | 78fbfd8 | 2011-03-12 00:00:52 -0500 | [diff] [blame] | 429 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
| 430 | RT_TOS(iph->tos), 0); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 431 | if (!IS_ERR(rt)) { |
Bart De Schuymer | 1c011be | 2005-09-14 20:55:16 -0700 | [diff] [blame] | 432 | /* - Bridged-and-DNAT'ed traffic doesn't |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 433 | * require ip_forwarding. */ |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 434 | if (rt->dst.dev == dev) { |
| 435 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | goto bridged_dnat; |
| 437 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 438 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 440 | free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | kfree_skb(skb); |
| 442 | return 0; |
| 443 | } else { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 444 | if (skb_dst(skb)->dev == dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | bridged_dnat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 447 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 448 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 449 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
| 450 | NF_BR_PRE_ROUTING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | skb, skb->dev, NULL, |
| 452 | br_nf_pre_routing_finish_bridge, |
| 453 | 1); |
| 454 | return 0; |
| 455 | } |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 456 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | skb->pkt_type = PACKET_HOST; |
| 458 | } |
| 459 | } else { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 460 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 461 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 462 | kfree_skb(skb); |
| 463 | return 0; |
| 464 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 465 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 469 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 470 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 471 | 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] | 472 | br_handle_frame_finish, 1); |
| 473 | |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | /* Some common code for IPv4/IPv6 */ |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 478 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
| 480 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 481 | |
| 482 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 483 | skb->pkt_type = PACKET_HOST; |
| 484 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 485 | } |
| 486 | |
| 487 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; |
| 488 | nf_bridge->physindev = skb->dev; |
| 489 | skb->dev = bridge_parent(skb->dev); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 490 | if (skb->protocol == htons(ETH_P_8021Q)) |
| 491 | nf_bridge->mask |= BRNF_8021Q; |
| 492 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
| 493 | nf_bridge->mask |= BRNF_PPPoE; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 494 | |
| 495 | return skb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ |
| 499 | static int check_hbh_len(struct sk_buff *skb) |
| 500 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 501 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | u32 pkt_len; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 503 | const unsigned char *nh = skb_network_header(skb); |
| 504 | int off = raw - nh; |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 505 | int len = (raw[1] + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
| 507 | if ((raw + len) - skb->data > skb_headlen(skb)) |
| 508 | goto bad; |
| 509 | |
| 510 | off += 2; |
| 511 | len -= 2; |
| 512 | |
| 513 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 514 | int optlen = nh[off + 1] + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 516 | switch (nh[off]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | case IPV6_TLV_PAD0: |
| 518 | optlen = 1; |
| 519 | break; |
| 520 | |
| 521 | case IPV6_TLV_PADN: |
| 522 | break; |
| 523 | |
| 524 | case IPV6_TLV_JUMBO: |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 525 | if (nh[off + 1] != 4 || (off & 3) != 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 527 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 528 | if (pkt_len <= IPV6_MAXPLEN || |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 529 | ipv6_hdr(skb)->payload_len) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 530 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
| 532 | goto bad; |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 533 | if (pskb_trim_rcsum(skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 534 | pkt_len + sizeof(struct ipv6hdr))) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 535 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 536 | nh = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | break; |
| 538 | default: |
| 539 | if (optlen > len) |
| 540 | goto bad; |
| 541 | break; |
| 542 | } |
| 543 | off += optlen; |
| 544 | len -= optlen; |
| 545 | } |
| 546 | if (len == 0) |
| 547 | return 0; |
| 548 | bad: |
| 549 | return -1; |
| 550 | |
| 551 | } |
| 552 | |
| 553 | /* Replicate the checks that IPv6 does on packet reception and pass the packet |
| 554 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ |
| 555 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 556 | struct sk_buff *skb, |
| 557 | const struct net_device *in, |
| 558 | const struct net_device *out, |
| 559 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 561 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | u32 pkt_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | if (skb->len < sizeof(struct ipv6hdr)) |
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 | |
| 567 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 568 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 570 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
| 572 | if (hdr->version != 6) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 573 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
| 575 | pkt_len = ntohs(hdr->payload_len); |
| 576 | |
| 577 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
| 578 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 579 | return NF_DROP; |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 580 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 581 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | } |
| 583 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 584 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 586 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 587 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 589 | if (!setup_pre_routing(skb)) |
| 590 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 592 | skb->protocol = htons(ETH_P_IPV6); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 593 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | br_nf_pre_routing_finish_ipv6); |
| 595 | |
| 596 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
| 600 | * Replicate the checks that IPv4 does on packet reception. |
| 601 | * Set skb->dev to the bridge device (i.e. parent of the |
| 602 | * receiving device) to make netfilter happy, the REDIRECT |
| 603 | * target in particular. Save the original destination IP |
| 604 | * address to be able to detect DNAT afterwards. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 605 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | ee02b3a | 2006-01-06 13:13:29 -0800 | [diff] [blame] | 606 | const struct net_device *in, |
| 607 | const struct net_device *out, |
| 608 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 610 | struct net_bridge_port *p; |
| 611 | struct net_bridge *br; |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 612 | __u32 len = nf_bridge_encap_header_len(skb); |
| 613 | |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 614 | if (unlikely(!pskb_may_pull(skb, len))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 615 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
David S. Miller | e490c1de | 2010-07-02 22:42:06 -0700 | [diff] [blame] | 617 | p = br_port_get_rcu(in); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 618 | if (p == NULL) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 619 | return NF_DROP; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 620 | br = p->br; |
| 621 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 622 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
| 623 | IS_PPPOE_IPV6(skb)) { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 624 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 626 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 627 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
| 629 | } |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 630 | |
| 631 | if (!brnf_call_iptables && !br->nf_call_iptables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 634 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
| 635 | !IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | return NF_ACCEPT; |
| 637 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 638 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 640 | if (br_parse_ip_options(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 641 | return NF_DROP; |
Herbert Xu | 1776206 | 2010-07-05 21:29:28 +0000 | [diff] [blame] | 642 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 643 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 644 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 646 | if (!setup_pre_routing(skb)) |
| 647 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | store_orig_dstaddr(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 649 | skb->protocol = htons(ETH_P_IP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 651 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | br_nf_pre_routing_finish); |
| 653 | |
| 654 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } |
| 656 | |
| 657 | |
| 658 | /* PF_BRIDGE/LOCAL_IN ************************************************/ |
| 659 | /* The packet is locally destined, which requires a real |
| 660 | * dst_entry, so detach the fake one. On the way up, the |
| 661 | * packet would pass through PRE_ROUTING again (which already |
| 662 | * took place when the packet entered the bridge), but we |
| 663 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will |
| 664 | * prevent this from happening. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 665 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 666 | const struct net_device *in, |
| 667 | const struct net_device *out, |
| 668 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 670 | struct rtable *rt = skb_rtable(skb); |
| 671 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 672 | if (rt && rt == bridge_parent_rtable(in)) |
| 673 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
| 675 | return NF_ACCEPT; |
| 676 | } |
| 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | /* PF_BRIDGE/FORWARD *************************************************/ |
| 679 | static int br_nf_forward_finish(struct sk_buff *skb) |
| 680 | { |
| 681 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 682 | struct net_device *in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 684 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | in = nf_bridge->physindev; |
| 686 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
| 687 | skb->pkt_type = PACKET_OTHERHOST; |
| 688 | nf_bridge->mask ^= BRNF_PKT_TYPE; |
| 689 | } |
Bart De Schuymer | e94c674 | 2010-05-13 14:55:34 +0200 | [diff] [blame] | 690 | nf_bridge_update_protocol(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } else { |
| 692 | in = *((struct net_device **)(skb->cb)); |
| 693 | } |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 694 | nf_bridge_push_encap_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 695 | |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 696 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 697 | skb->dev, br_forward_finish, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | return 0; |
| 699 | } |
| 700 | |
| 701 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
| 702 | * netfilter with indev and outdev set to the bridge device, |
| 703 | * but we are still able to filter on the 'real' indev/outdev |
| 704 | * because of the physdev module. For ARP, indev and outdev are the |
| 705 | * bridge ports. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 706 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 707 | const struct net_device *in, |
| 708 | const struct net_device *out, |
| 709 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | struct nf_bridge_info *nf_bridge; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 712 | struct net_device *parent; |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 713 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
| 715 | if (!skb->nf_bridge) |
| 716 | return NF_ACCEPT; |
| 717 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 718 | /* Need exclusive nf_bridge_info since we might have multiple |
| 719 | * different physoutdevs. */ |
| 720 | if (!nf_bridge_unshare(skb)) |
| 721 | return NF_DROP; |
| 722 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 723 | parent = bridge_parent(out); |
| 724 | if (!parent) |
| 725 | return NF_DROP; |
| 726 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 727 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
| 728 | IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | pf = PF_INET; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 730 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
| 731 | IS_PPPOE_IPV6(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | pf = PF_INET6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 733 | else |
| 734 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 736 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | nf_bridge = skb->nf_bridge; |
| 739 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 740 | skb->pkt_type = PACKET_HOST; |
| 741 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 742 | } |
| 743 | |
Stephen Hemminger | cb68552 | 2011-05-13 16:03:24 -0400 | [diff] [blame] | 744 | if (pf == PF_INET && br_parse_ip_options(skb)) |
Herbert Xu | 6b1e960 | 2011-03-18 05:27:28 +0000 | [diff] [blame] | 745 | return NF_DROP; |
| 746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | /* The physdev module checks on this */ |
| 748 | nf_bridge->mask |= BRNF_BRIDGED; |
| 749 | nf_bridge->physoutdev = skb->dev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 750 | if (pf == PF_INET) |
| 751 | skb->protocol = htons(ETH_P_IP); |
| 752 | else |
| 753 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 755 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 756 | br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
| 758 | return NF_STOLEN; |
| 759 | } |
| 760 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 761 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 762 | const struct net_device *in, |
| 763 | const struct net_device *out, |
| 764 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 766 | struct net_bridge_port *p; |
| 767 | struct net_bridge *br; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | struct net_device **d = (struct net_device **)(skb->cb); |
| 769 | |
David S. Miller | e490c1de | 2010-07-02 22:42:06 -0700 | [diff] [blame] | 770 | p = br_port_get_rcu(out); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 771 | if (p == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 773 | br = p->br; |
| 774 | |
| 775 | if (!brnf_call_arptables && !br->nf_call_arptables) |
| 776 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Stephen Hemminger | f8a2602 | 2006-03-20 22:57:46 -0800 | [diff] [blame] | 778 | if (skb->protocol != htons(ETH_P_ARP)) { |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 779 | if (!IS_VLAN_ARP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | return NF_ACCEPT; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 781 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | } |
| 783 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 784 | if (arp_hdr(skb)->ar_pln != 4) { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 785 | if (IS_VLAN_ARP(skb)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 786 | nf_bridge_push_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | return NF_ACCEPT; |
| 788 | } |
| 789 | *d = (struct net_device *)in; |
Jan Engelhardt | fdc9314 | 2008-10-20 03:34:51 -0700 | [diff] [blame] | 790 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | (struct net_device *)out, br_nf_forward_finish); |
| 792 | |
| 793 | return NF_STOLEN; |
| 794 | } |
| 795 | |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 796 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 797 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
| 798 | { |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 799 | int ret; |
| 800 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 801 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
Bart De Schuymer | 6c79bf0 | 2010-04-20 16:22:01 +0200 | [diff] [blame] | 802 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
David S. Miller | 87f94b4 | 2010-09-01 18:06:39 -0700 | [diff] [blame] | 803 | !skb_is_gso(skb)) { |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 804 | if (br_parse_ip_options(skb)) |
| 805 | /* Drop invalid packet */ |
| 806 | return NF_DROP; |
| 807 | ret = ip_fragment(skb, br_dev_queue_push_xmit); |
David S. Miller | 87f94b4 | 2010-09-01 18:06:39 -0700 | [diff] [blame] | 808 | } else |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 809 | ret = br_dev_queue_push_xmit(skb); |
| 810 | |
| 811 | return ret; |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 812 | } |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 813 | #else |
| 814 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
| 815 | { |
| 816 | return br_dev_queue_push_xmit(skb); |
| 817 | } |
| 818 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | /* PF_BRIDGE/POST_ROUTING ********************************************/ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 821 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 822 | const struct net_device *in, |
| 823 | const struct net_device *out, |
| 824 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 826 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | struct net_device *realoutdev = bridge_parent(skb->dev); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 828 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 830 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
Patrick McHardy | 81d9dda | 2007-11-13 02:58:44 -0800 | [diff] [blame] | 831 | return NF_ACCEPT; |
| 832 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 833 | if (!realoutdev) |
| 834 | return NF_DROP; |
| 835 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 836 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
| 837 | IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | pf = PF_INET; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 839 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
| 840 | IS_PPPOE_IPV6(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | pf = PF_INET6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 842 | else |
| 843 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
| 846 | * about the value of skb->pkt_type. */ |
| 847 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 848 | skb->pkt_type = PACKET_HOST; |
| 849 | nf_bridge->mask |= BRNF_PKT_TYPE; |
| 850 | } |
| 851 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 852 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | nf_bridge_save_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 854 | if (pf == PF_INET) |
| 855 | skb->protocol = htons(ETH_P_IP); |
| 856 | else |
| 857 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 859 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 860 | br_nf_dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
| 862 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | } |
| 864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | /* IP/SABOTAGE *****************************************************/ |
| 866 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING |
| 867 | * for the second time. */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 868 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 869 | const struct net_device *in, |
| 870 | const struct net_device *out, |
| 871 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 873 | if (skb->nf_bridge && |
| 874 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | return NF_STOP; |
| 876 | } |
| 877 | |
| 878 | return NF_ACCEPT; |
| 879 | } |
| 880 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 881 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
| 882 | * br_dev_queue_push_xmit is called afterwards */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 883 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 884 | { |
| 885 | .hook = br_nf_pre_routing, |
| 886 | .owner = THIS_MODULE, |
| 887 | .pf = PF_BRIDGE, |
| 888 | .hooknum = NF_BR_PRE_ROUTING, |
| 889 | .priority = NF_BR_PRI_BRNF, |
| 890 | }, |
| 891 | { |
| 892 | .hook = br_nf_local_in, |
| 893 | .owner = THIS_MODULE, |
| 894 | .pf = PF_BRIDGE, |
| 895 | .hooknum = NF_BR_LOCAL_IN, |
| 896 | .priority = NF_BR_PRI_BRNF, |
| 897 | }, |
| 898 | { |
| 899 | .hook = br_nf_forward_ip, |
| 900 | .owner = THIS_MODULE, |
| 901 | .pf = PF_BRIDGE, |
| 902 | .hooknum = NF_BR_FORWARD, |
| 903 | .priority = NF_BR_PRI_BRNF - 1, |
| 904 | }, |
| 905 | { |
| 906 | .hook = br_nf_forward_arp, |
| 907 | .owner = THIS_MODULE, |
| 908 | .pf = PF_BRIDGE, |
| 909 | .hooknum = NF_BR_FORWARD, |
| 910 | .priority = NF_BR_PRI_BRNF, |
| 911 | }, |
| 912 | { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 913 | .hook = br_nf_post_routing, |
| 914 | .owner = THIS_MODULE, |
| 915 | .pf = PF_BRIDGE, |
| 916 | .hooknum = NF_BR_POST_ROUTING, |
| 917 | .priority = NF_BR_PRI_LAST, |
| 918 | }, |
| 919 | { |
| 920 | .hook = ip_sabotage_in, |
| 921 | .owner = THIS_MODULE, |
| 922 | .pf = PF_INET, |
| 923 | .hooknum = NF_INET_PRE_ROUTING, |
| 924 | .priority = NF_IP_PRI_FIRST, |
| 925 | }, |
| 926 | { |
| 927 | .hook = ip_sabotage_in, |
| 928 | .owner = THIS_MODULE, |
| 929 | .pf = PF_INET6, |
| 930 | .hooknum = NF_INET_PRE_ROUTING, |
| 931 | .priority = NF_IP6_PRI_FIRST, |
| 932 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | }; |
| 934 | |
| 935 | #ifdef CONFIG_SYSCTL |
| 936 | static |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 937 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 938 | void __user * buffer, size_t * lenp, loff_t * ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | { |
| 940 | int ret; |
| 941 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 942 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
| 944 | if (write && *(int *)(ctl->data)) |
| 945 | *(int *)(ctl->data) = 1; |
| 946 | return ret; |
| 947 | } |
| 948 | |
| 949 | static ctl_table brnf_table[] = { |
| 950 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | .procname = "bridge-nf-call-arptables", |
| 952 | .data = &brnf_call_arptables, |
| 953 | .maxlen = sizeof(int), |
| 954 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 955 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | }, |
| 957 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | .procname = "bridge-nf-call-iptables", |
| 959 | .data = &brnf_call_iptables, |
| 960 | .maxlen = sizeof(int), |
| 961 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 962 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | }, |
| 964 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | .procname = "bridge-nf-call-ip6tables", |
| 966 | .data = &brnf_call_ip6tables, |
| 967 | .maxlen = sizeof(int), |
| 968 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 969 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | }, |
| 971 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | .procname = "bridge-nf-filter-vlan-tagged", |
| 973 | .data = &brnf_filter_vlan_tagged, |
| 974 | .maxlen = sizeof(int), |
| 975 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 976 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | }, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 978 | { |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 979 | .procname = "bridge-nf-filter-pppoe-tagged", |
| 980 | .data = &brnf_filter_pppoe_tagged, |
| 981 | .maxlen = sizeof(int), |
| 982 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 983 | .proc_handler = brnf_sysctl_call_tables, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 984 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 985 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | }; |
| 987 | |
Pavel Emelyanov | b5ccd79 | 2008-01-09 00:30:05 -0800 | [diff] [blame] | 988 | static struct ctl_path brnf_path[] = { |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 989 | { .procname = "net", }, |
| 990 | { .procname = "bridge", }, |
Pavel Emelyanov | b5ccd79 | 2008-01-09 00:30:05 -0800 | [diff] [blame] | 991 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | }; |
| 993 | #endif |
| 994 | |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 995 | int __init br_netfilter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 997 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 999 | ret = dst_entries_init(&fake_dst_ops); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1000 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | return ret; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 1002 | |
| 1003 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
| 1004 | if (ret < 0) { |
| 1005 | dst_entries_destroy(&fake_dst_ops); |
| 1006 | return ret; |
| 1007 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | #ifdef CONFIG_SYSCTL |
Pavel Emelyanov | b5ccd79 | 2008-01-09 00:30:05 -0800 | [diff] [blame] | 1009 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | if (brnf_sysctl_header == NULL) { |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 1011 | printk(KERN_WARNING |
| 1012 | "br_netfilter: can't register to sysctl.\n"); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1013 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 1014 | dst_entries_destroy(&fake_dst_ops); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1015 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | } |
| 1017 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | return 0; |
| 1020 | } |
| 1021 | |
| 1022 | void br_netfilter_fini(void) |
| 1023 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1024 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | #ifdef CONFIG_SYSCTL |
| 1026 | unregister_sysctl_table(brnf_sysctl_header); |
| 1027 | #endif |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 1028 | dst_entries_destroy(&fake_dst_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |