Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Handle firewalling |
| 3 | * Linux ethernet bridge |
| 4 | * |
| 5 | * Authors: |
Bart De Schuymer | 8237908 | 2010-04-13 11:40:41 +0200 | [diff] [blame] | 6 | * Lennert Buytenhek <buytenh@gnu.org> |
| 7 | * Bart De Schuymer <bdschuym@pandora.be> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * Lennert dedicates this file to Kerstin Wurdinger. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/ip.h> |
| 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/skbuff.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 23 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/if_ether.h> |
| 25 | #include <linux/if_vlan.h> |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 26 | #include <linux/if_pppox.h> |
| 27 | #include <linux/ppp_defs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/netfilter_bridge.h> |
| 29 | #include <linux/netfilter_ipv4.h> |
| 30 | #include <linux/netfilter_ipv6.h> |
| 31 | #include <linux/netfilter_arp.h> |
| 32 | #include <linux/in_route.h> |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 33 | #include <linux/inetdevice.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <net/ip.h> |
| 36 | #include <net/ipv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 37 | #include <net/route.h> |
Florian Westphal | 5676864 | 2014-11-13 10:04:16 +0100 | [diff] [blame] | 38 | #include <net/netfilter/br_netfilter.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 39 | |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 40 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| 41 | #include <net/netfilter/nf_conntrack.h> |
| 42 | #endif |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include "br_private.h" |
| 46 | #ifdef CONFIG_SYSCTL |
| 47 | #include <linux/sysctl.h> |
| 48 | #endif |
| 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) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 68 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 69 | |
| 70 | #define IS_IPV6(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 71 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 72 | |
| 73 | #define IS_ARP(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 74 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 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 | { |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 78 | if (skb_vlan_tag_present(skb)) |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 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 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 114 | /* largest possible L2 header, see br_nf_dev_queue_xmit() */ |
| 115 | #define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN) |
| 116 | |
| 117 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
| 118 | struct brnf_frag_data { |
| 119 | char mac[NF_BRIDGE_MAX_MAC_HEADER_LENGTH]; |
| 120 | u8 encap_size; |
| 121 | u8 size; |
| 122 | }; |
| 123 | |
| 124 | static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage); |
| 125 | #endif |
| 126 | |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 127 | static struct nf_bridge_info *nf_bridge_info_get(const struct sk_buff *skb) |
| 128 | { |
| 129 | return skb->nf_bridge; |
| 130 | } |
| 131 | |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame^] | 132 | static void nf_bridge_info_free(struct sk_buff *skb) |
| 133 | { |
| 134 | if (skb->nf_bridge) { |
| 135 | nf_bridge_put(skb->nf_bridge); |
| 136 | skb->nf_bridge = NULL; |
| 137 | } |
| 138 | } |
| 139 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 140 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
| 141 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 142 | struct net_bridge_port *port; |
| 143 | |
| 144 | port = br_port_get_rcu(dev); |
| 145 | return port ? &port->br->fake_rtable : NULL; |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 146 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 148 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
| 149 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 150 | struct net_bridge_port *port; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 151 | |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 152 | port = br_port_get_rcu(dev); |
| 153 | return port ? port->br->dev : NULL; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 154 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 156 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
| 157 | { |
| 158 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); |
| 159 | if (likely(skb->nf_bridge)) |
| 160 | atomic_set(&(skb->nf_bridge->use), 1); |
| 161 | |
| 162 | return skb->nf_bridge; |
| 163 | } |
| 164 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 165 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
| 166 | { |
| 167 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 168 | |
| 169 | if (atomic_read(&nf_bridge->use) > 1) { |
| 170 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); |
| 171 | |
| 172 | if (tmp) { |
| 173 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); |
| 174 | atomic_set(&tmp->use, 1); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 175 | } |
Changli Gao | 4c3a76a | 2010-08-22 19:03:26 +0000 | [diff] [blame] | 176 | nf_bridge_put(nf_bridge); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 177 | nf_bridge = tmp; |
| 178 | } |
| 179 | return nf_bridge; |
| 180 | } |
| 181 | |
Florian Westphal | 8d04516 | 2015-03-18 20:55:31 +0100 | [diff] [blame] | 182 | static unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) |
| 183 | { |
| 184 | switch (skb->protocol) { |
| 185 | case __cpu_to_be16(ETH_P_8021Q): |
| 186 | return VLAN_HLEN; |
| 187 | case __cpu_to_be16(ETH_P_PPP_SES): |
| 188 | return PPPOE_SES_HLEN; |
| 189 | default: |
| 190 | return 0; |
| 191 | } |
| 192 | } |
| 193 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 194 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
| 195 | { |
| 196 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 197 | |
| 198 | skb_push(skb, len); |
| 199 | skb->network_header -= len; |
| 200 | } |
| 201 | |
| 202 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
| 203 | { |
| 204 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 205 | |
| 206 | skb_pull(skb, len); |
| 207 | skb->network_header += len; |
| 208 | } |
| 209 | |
| 210 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
| 211 | { |
| 212 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 213 | |
| 214 | skb_pull_rcsum(skb, len); |
| 215 | skb->network_header += len; |
| 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 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 225 | const struct iphdr *iph; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 226 | struct net_device *dev = skb->dev; |
| 227 | u32 len; |
| 228 | |
Sarveshwar Bandi | 6caab7b | 2012-10-10 01:15:01 +0000 | [diff] [blame] | 229 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 230 | goto inhdr_error; |
| 231 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 232 | iph = ip_hdr(skb); |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 233 | |
| 234 | /* Basic sanity checks */ |
| 235 | if (iph->ihl < 5 || iph->version != 4) |
| 236 | goto inhdr_error; |
| 237 | |
| 238 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 239 | goto inhdr_error; |
| 240 | |
| 241 | iph = ip_hdr(skb); |
| 242 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
| 243 | goto inhdr_error; |
| 244 | |
| 245 | len = ntohs(iph->tot_len); |
| 246 | if (skb->len < len) { |
| 247 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); |
| 248 | goto drop; |
| 249 | } else if (len < (iph->ihl*4)) |
| 250 | goto inhdr_error; |
| 251 | |
| 252 | if (pskb_trim_rcsum(skb, len)) { |
| 253 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
| 254 | goto drop; |
| 255 | } |
| 256 | |
Eric Dumazet | f8e9881 | 2011-04-12 13:39:14 -0700 | [diff] [blame] | 257 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
Herbert Xu | 7677e86 | 2014-10-04 22:18:02 +0800 | [diff] [blame] | 258 | /* We should really parse IP options here but until |
| 259 | * somebody who actually uses IP options complains to |
| 260 | * us we'll just silently ignore the options because |
| 261 | * we're lazy! |
| 262 | */ |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 263 | return 0; |
| 264 | |
| 265 | inhdr_error: |
| 266 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); |
| 267 | drop: |
| 268 | return -1; |
| 269 | } |
| 270 | |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 271 | static void nf_bridge_update_protocol(struct sk_buff *skb) |
| 272 | { |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 273 | switch (skb->nf_bridge->orig_proto) { |
| 274 | case BRNF_PROTO_8021Q: |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 275 | skb->protocol = htons(ETH_P_8021Q); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 276 | break; |
| 277 | case BRNF_PROTO_PPPOE: |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 278 | skb->protocol = htons(ETH_P_PPP_SES); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 279 | break; |
| 280 | case BRNF_PROTO_UNCHANGED: |
| 281 | break; |
| 282 | } |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 283 | } |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
| 286 | /* Undo the changes made for ip6tables PREROUTING and continue the |
| 287 | * bridge PRE_ROUTING hook. */ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 288 | static int br_nf_pre_routing_finish_ipv6(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 290 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 291 | struct rtable *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 293 | if (nf_bridge->pkt_otherhost) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | skb->pkt_type = PACKET_OTHERHOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 295 | nf_bridge->pkt_otherhost = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
| 297 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
| 298 | |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 299 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 300 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 301 | kfree_skb(skb); |
| 302 | return 0; |
| 303 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 304 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 307 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 308 | nf_bridge_push_encap_header(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 309 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, sk, skb, |
| 310 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | br_handle_frame_finish, 1); |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 316 | /* Obtain the correct destination MAC address, while preserving the original |
| 317 | * source MAC address. If we already know this address, we just copy it. If we |
| 318 | * don't, we use the neighbour framework to find out. In both cases, we make |
| 319 | * sure that br_handle_frame_finish() is called afterwards. |
| 320 | */ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 321 | static int br_nf_pre_routing_finish_bridge(struct sock *sk, struct sk_buff *skb) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 322 | { |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 323 | struct neighbour *neigh; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 324 | struct dst_entry *dst; |
| 325 | |
| 326 | skb->dev = bridge_parent(skb->dev); |
| 327 | if (!skb->dev) |
| 328 | goto free_skb; |
| 329 | dst = skb_dst(skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 330 | neigh = dst_neigh_lookup_skb(dst, skb); |
| 331 | if (neigh) { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 332 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 333 | int ret; |
| 334 | |
| 335 | if (neigh->hh.hh_len) { |
| 336 | neigh_hh_bridge(&neigh->hh, skb); |
| 337 | skb->dev = nf_bridge->physindev; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 338 | ret = br_handle_frame_finish(sk, skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 339 | } else { |
| 340 | /* the neighbour function below overwrites the complete |
| 341 | * MAC header, so we save the Ethernet source address and |
| 342 | * protocol number. |
| 343 | */ |
| 344 | skb_copy_from_linear_data_offset(skb, |
| 345 | -(ETH_HLEN-ETH_ALEN), |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 346 | nf_bridge->neigh_header, |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 347 | ETH_HLEN-ETH_ALEN); |
| 348 | /* tell br_dev_xmit to continue with forwarding */ |
| 349 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 350 | /* FIXME Need to refragment */ |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 351 | ret = neigh->output(neigh, skb); |
| 352 | } |
| 353 | neigh_release(neigh); |
| 354 | return ret; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 355 | } |
| 356 | free_skb: |
| 357 | kfree_skb(skb); |
| 358 | return 0; |
| 359 | } |
| 360 | |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 361 | static bool dnat_took_place(const struct sk_buff *skb) |
| 362 | { |
| 363 | #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| 364 | enum ip_conntrack_info ctinfo; |
| 365 | struct nf_conn *ct; |
| 366 | |
| 367 | ct = nf_ct_get(skb, &ctinfo); |
| 368 | if (!ct || nf_ct_is_untracked(ct)) |
| 369 | return false; |
| 370 | |
| 371 | return test_bit(IPS_DST_NAT_BIT, &ct->status); |
| 372 | #else |
| 373 | return false; |
| 374 | #endif |
| 375 | } |
| 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | /* This requires some explaining. If DNAT has taken place, |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 378 | * we will need to fix up the destination Ethernet address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | * |
| 380 | * There are two cases to consider: |
| 381 | * 1. The packet was DNAT'ed to a device in the same bridge |
| 382 | * port group as it was received on. We can still bridge |
| 383 | * the packet. |
| 384 | * 2. The packet was DNAT'ed to a different device, either |
| 385 | * a non-bridged device or another bridge port group. |
| 386 | * The packet will need to be routed. |
| 387 | * |
| 388 | * The correct way of distinguishing between these two cases is to |
| 389 | * call ip_route_input() and to look at skb->dst->dev, which is |
| 390 | * changed to the destination device if ip_route_input() succeeds. |
| 391 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 392 | * Let's first consider the case that ip_route_input() succeeds: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 394 | * If the output device equals the logical bridge device the packet |
| 395 | * came in on, we can consider this bridging. The corresponding MAC |
| 396 | * address will be obtained in br_nf_pre_routing_finish_bridge. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | * Otherwise, the packet is considered to be routed and we just |
| 398 | * change the destination MAC address so that the packet will |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 399 | * later be passed up to the IP stack to be routed. For a redirected |
| 400 | * packet, ip_route_input() will give back the localhost as output device, |
| 401 | * which differs from the bridge device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 403 | * Let's now consider the case that ip_route_input() fails: |
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 | * This can be because the destination address is martian, in which case |
| 406 | * the packet will be dropped. |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 407 | * If IP forwarding is disabled, ip_route_input() will fail, while |
| 408 | * ip_route_output_key() can return success. The source |
| 409 | * 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] | 410 | * 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] | 411 | * if IP forwarding is enabled. If the output device equals the logical bridge |
| 412 | * device, we proceed as if ip_route_input() succeeded. If it differs from the |
| 413 | * logical bridge port or if ip_route_output_key() fails we drop the packet. |
| 414 | */ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 415 | static int br_nf_pre_routing_finish(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | { |
| 417 | struct net_device *dev = skb->dev; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 418 | struct iphdr *iph = ip_hdr(skb); |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 419 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 420 | struct rtable *rt; |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 421 | int err; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 422 | int frag_max_size; |
| 423 | |
| 424 | frag_max_size = IPCB(skb)->frag_max_size; |
| 425 | BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 427 | if (nf_bridge->pkt_otherhost) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | skb->pkt_type = PACKET_OTHERHOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 429 | nf_bridge->pkt_otherhost = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | } |
| 431 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | if (dnat_took_place(skb)) { |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 433 | 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] | 434 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 435 | |
| 436 | /* If err equals -EHOSTUNREACH the error is due to a |
| 437 | * martian destination or due to the fact that |
| 438 | * forwarding is disabled. For most martian packets, |
| 439 | * ip_route_output_key() will fail. It won't fail for 2 types of |
| 440 | * martian destinations: loopback destinations and destination |
| 441 | * 0.0.0.0. In both cases the packet will be dropped because the |
| 442 | * destination is the loopback device and not the bridge. */ |
| 443 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) |
| 444 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
David S. Miller | 78fbfd8 | 2011-03-12 00:00:52 -0500 | [diff] [blame] | 446 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
| 447 | RT_TOS(iph->tos), 0); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 448 | if (!IS_ERR(rt)) { |
Bart De Schuymer | 1c011be | 2005-09-14 20:55:16 -0700 | [diff] [blame] | 449 | /* - Bridged-and-DNAT'ed traffic doesn't |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 450 | * require ip_forwarding. */ |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 451 | if (rt->dst.dev == dev) { |
| 452 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | goto bridged_dnat; |
| 454 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 455 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | } |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 457 | free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | kfree_skb(skb); |
| 459 | return 0; |
| 460 | } else { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 461 | if (skb_dst(skb)->dev == dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | bridged_dnat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 464 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 465 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 466 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
| 467 | NF_BR_PRE_ROUTING, |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 468 | sk, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | br_nf_pre_routing_finish_bridge, |
| 470 | 1); |
| 471 | return 0; |
| 472 | } |
Joe Perches | 0409114 | 2014-02-23 00:05:26 -0800 | [diff] [blame] | 473 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | skb->pkt_type = PACKET_HOST; |
| 475 | } |
| 476 | } else { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 477 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 478 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 479 | kfree_skb(skb); |
| 480 | return 0; |
| 481 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 482 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | |
| 485 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 486 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 487 | nf_bridge_push_encap_header(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 488 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, sk, skb, |
| 489 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | br_handle_frame_finish, 1); |
| 491 | |
| 492 | return 0; |
| 493 | } |
| 494 | |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 495 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
| 496 | { |
| 497 | struct net_device *vlan, *br; |
| 498 | |
| 499 | br = bridge_parent(dev); |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 500 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 501 | return br; |
| 502 | |
dingtianhong | f06c7f9 | 2014-05-09 14:58:05 +0800 | [diff] [blame] | 503 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 504 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 505 | |
| 506 | return vlan ? vlan : br; |
| 507 | } |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | /* Some common code for IPv4/IPv6 */ |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 510 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 512 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 515 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 516 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; |
| 520 | nf_bridge->physindev = skb->dev; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 521 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 522 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 523 | if (skb->protocol == htons(ETH_P_8021Q)) |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 524 | nf_bridge->orig_proto = BRNF_PROTO_8021Q; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 525 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 526 | nf_bridge->orig_proto = BRNF_PROTO_PPPOE; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 527 | |
Florian Westphal | 6b8dbcf | 2013-10-24 21:32:42 +0200 | [diff] [blame] | 528 | /* Must drop socket now because of tproxy. */ |
| 529 | skb_orphan(skb); |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 530 | return skb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ |
| 534 | static int check_hbh_len(struct sk_buff *skb) |
| 535 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 536 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | u32 pkt_len; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 538 | const unsigned char *nh = skb_network_header(skb); |
| 539 | int off = raw - nh; |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 540 | int len = (raw[1] + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
| 542 | if ((raw + len) - skb->data > skb_headlen(skb)) |
| 543 | goto bad; |
| 544 | |
| 545 | off += 2; |
| 546 | len -= 2; |
| 547 | |
| 548 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 549 | int optlen = nh[off + 1] + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 551 | switch (nh[off]) { |
Eldad Zack | 1de5a71 | 2012-05-17 06:00:25 +0000 | [diff] [blame] | 552 | case IPV6_TLV_PAD1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | optlen = 1; |
| 554 | break; |
| 555 | |
| 556 | case IPV6_TLV_PADN: |
| 557 | break; |
| 558 | |
| 559 | case IPV6_TLV_JUMBO: |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 560 | if (nh[off + 1] != 4 || (off & 3) != 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 562 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 563 | if (pkt_len <= IPV6_MAXPLEN || |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 564 | ipv6_hdr(skb)->payload_len) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 565 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
| 567 | goto bad; |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 568 | if (pskb_trim_rcsum(skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 569 | pkt_len + sizeof(struct ipv6hdr))) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 570 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 571 | nh = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | break; |
| 573 | default: |
| 574 | if (optlen > len) |
| 575 | goto bad; |
| 576 | break; |
| 577 | } |
| 578 | off += optlen; |
| 579 | len -= optlen; |
| 580 | } |
| 581 | if (len == 0) |
| 582 | return 0; |
| 583 | bad: |
| 584 | return -1; |
| 585 | |
| 586 | } |
| 587 | |
| 588 | /* Replicate the checks that IPv6 does on packet reception and pass the packet |
| 589 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 590 | 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] | 591 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 592 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 594 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | u32 pkt_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
| 597 | if (skb->len < sizeof(struct ipv6hdr)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 598 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 601 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 603 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | if (hdr->version != 6) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 606 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
| 608 | pkt_len = ntohs(hdr->payload_len); |
| 609 | |
| 610 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
| 611 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 612 | return NF_DROP; |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 613 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 614 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } |
| 616 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 617 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 619 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 620 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 622 | if (!setup_pre_routing(skb)) |
| 623 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 625 | skb->protocol = htons(ETH_P_IPV6); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 626 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, state->sk, skb, |
| 627 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | br_nf_pre_routing_finish_ipv6); |
| 629 | |
| 630 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |
| 632 | |
| 633 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
| 634 | * Replicate the checks that IPv4 does on packet reception. |
| 635 | * Set skb->dev to the bridge device (i.e. parent of the |
| 636 | * receiving device) to make netfilter happy, the REDIRECT |
| 637 | * target in particular. Save the original destination IP |
| 638 | * address to be able to detect DNAT afterwards. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 639 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
| 640 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 641 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 643 | struct net_bridge_port *p; |
| 644 | struct net_bridge *br; |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 645 | __u32 len = nf_bridge_encap_header_len(skb); |
| 646 | |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 647 | if (unlikely(!pskb_may_pull(skb, len))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 648 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 650 | p = br_port_get_rcu(state->in); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 651 | if (p == NULL) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 652 | return NF_DROP; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 653 | br = p->br; |
| 654 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 655 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 656 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 658 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 659 | nf_bridge_pull_encap_header_rcsum(skb); |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 660 | return br_nf_pre_routing_ipv6(ops, skb, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 662 | |
| 663 | if (!brnf_call_iptables && !br->nf_call_iptables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 666 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return NF_ACCEPT; |
| 668 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 669 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 671 | if (br_parse_ip_options(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 672 | return NF_DROP; |
Herbert Xu | 1776206 | 2010-07-05 21:29:28 +0000 | [diff] [blame] | 673 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 674 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 675 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 677 | if (!setup_pre_routing(skb)) |
| 678 | return NF_DROP; |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 679 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 680 | skb->protocol = htons(ETH_P_IP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 682 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->sk, skb, |
| 683 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | br_nf_pre_routing_finish); |
| 685 | |
| 686 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | |
| 690 | /* PF_BRIDGE/LOCAL_IN ************************************************/ |
| 691 | /* The packet is locally destined, which requires a real |
| 692 | * dst_entry, so detach the fake one. On the way up, the |
| 693 | * packet would pass through PRE_ROUTING again (which already |
| 694 | * took place when the packet entered the bridge), but we |
| 695 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will |
| 696 | * prevent this from happening. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 697 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
| 698 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 699 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | { |
Peter Huang (Peng) | a881e96 | 2012-04-19 20:12:51 +0000 | [diff] [blame] | 701 | br_drop_fake_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | return NF_ACCEPT; |
| 703 | } |
| 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | /* PF_BRIDGE/FORWARD *************************************************/ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 706 | static int br_nf_forward_finish(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 708 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | struct net_device *in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 711 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 712 | int frag_max_size; |
| 713 | |
| 714 | if (skb->protocol == htons(ETH_P_IP)) { |
| 715 | frag_max_size = IPCB(skb)->frag_max_size; |
| 716 | BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; |
| 717 | } |
| 718 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | in = nf_bridge->physindev; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 720 | if (nf_bridge->pkt_otherhost) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | skb->pkt_type = PACKET_OTHERHOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 722 | nf_bridge->pkt_otherhost = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | } |
Bart De Schuymer | e94c674 | 2010-05-13 14:55:34 +0200 | [diff] [blame] | 724 | nf_bridge_update_protocol(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } else { |
| 726 | in = *((struct net_device **)(skb->cb)); |
| 727 | } |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 728 | nf_bridge_push_encap_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 729 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 730 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, sk, skb, |
| 731 | in, skb->dev, br_forward_finish, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | return 0; |
| 733 | } |
| 734 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
| 737 | * netfilter with indev and outdev set to the bridge device, |
| 738 | * but we are still able to filter on the 'real' indev/outdev |
| 739 | * because of the physdev module. For ARP, indev and outdev are the |
| 740 | * bridge ports. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 741 | static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops, |
| 742 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 743 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | struct nf_bridge_info *nf_bridge; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 746 | struct net_device *parent; |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 747 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
| 749 | if (!skb->nf_bridge) |
| 750 | return NF_ACCEPT; |
| 751 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 752 | /* Need exclusive nf_bridge_info since we might have multiple |
| 753 | * different physoutdevs. */ |
| 754 | if (!nf_bridge_unshare(skb)) |
| 755 | return NF_DROP; |
| 756 | |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 757 | nf_bridge = nf_bridge_info_get(skb); |
| 758 | if (!nf_bridge) |
| 759 | return NF_DROP; |
| 760 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 761 | parent = bridge_parent(state->out); |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 762 | if (!parent) |
| 763 | return NF_DROP; |
| 764 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 765 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 766 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 767 | 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] | 768 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 769 | else |
| 770 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 772 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 775 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 776 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | } |
| 778 | |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 779 | if (pf == NFPROTO_IPV4) { |
| 780 | int frag_max = BR_INPUT_SKB_CB(skb)->frag_max_size; |
| 781 | |
| 782 | if (br_parse_ip_options(skb)) |
| 783 | return NF_DROP; |
| 784 | |
| 785 | IPCB(skb)->frag_max_size = frag_max; |
| 786 | } |
Herbert Xu | 6b1e960 | 2011-03-18 05:27:28 +0000 | [diff] [blame] | 787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | nf_bridge->physoutdev = skb->dev; |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 789 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 790 | skb->protocol = htons(ETH_P_IP); |
| 791 | else |
| 792 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 794 | NF_HOOK(pf, NF_INET_FORWARD, NULL, skb, |
| 795 | brnf_get_logical_dev(skb, state->in), |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 796 | parent, br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | return NF_STOLEN; |
| 799 | } |
| 800 | |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 801 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
| 802 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 803 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 805 | struct net_bridge_port *p; |
| 806 | struct net_bridge *br; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | struct net_device **d = (struct net_device **)(skb->cb); |
| 808 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 809 | p = br_port_get_rcu(state->out); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 810 | if (p == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 812 | br = p->br; |
| 813 | |
| 814 | if (!brnf_call_arptables && !br->nf_call_arptables) |
| 815 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 817 | if (!IS_ARP(skb)) { |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 818 | if (!IS_VLAN_ARP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | return NF_ACCEPT; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 820 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | } |
| 822 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 823 | if (arp_hdr(skb)->ar_pln != 4) { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 824 | if (IS_VLAN_ARP(skb)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 825 | nf_bridge_push_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | return NF_ACCEPT; |
| 827 | } |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 828 | *d = state->in; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 829 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, state->sk, skb, |
| 830 | state->in, state->out, br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
| 832 | return NF_STOLEN; |
| 833 | } |
| 834 | |
Vasily Averin | aff09ce | 2014-05-05 00:17:48 +0400 | [diff] [blame] | 835 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 836 | static int br_nf_push_frag_xmit(struct sock *sk, struct sk_buff *skb) |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame] | 837 | { |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 838 | struct brnf_frag_data *data; |
| 839 | int err; |
| 840 | |
| 841 | data = this_cpu_ptr(&brnf_frag_data_storage); |
| 842 | err = skb_cow_head(skb, data->size); |
| 843 | |
| 844 | if (err) { |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame] | 845 | kfree_skb(skb); |
| 846 | return 0; |
| 847 | } |
| 848 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 849 | skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size); |
| 850 | __skb_push(skb, data->encap_size); |
| 851 | |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame^] | 852 | nf_bridge_info_free(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 853 | return br_dev_queue_push_xmit(sk, skb); |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame] | 854 | } |
| 855 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 856 | static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb) |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 857 | { |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 858 | int ret; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 859 | int frag_max_size; |
Florian Westphal | 7a8d831 | 2015-03-05 00:52:36 +0100 | [diff] [blame] | 860 | unsigned int mtu_reserved; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 861 | |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame^] | 862 | if (skb_is_gso(skb) || skb->protocol != htons(ETH_P_IP)) { |
| 863 | nf_bridge_info_free(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 864 | return br_dev_queue_push_xmit(sk, skb); |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame^] | 865 | } |
Florian Westphal | 7a8d831 | 2015-03-05 00:52:36 +0100 | [diff] [blame] | 866 | |
| 867 | mtu_reserved = nf_bridge_mtu_reduction(skb); |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 868 | /* This is wrong! We should preserve the original fragment |
| 869 | * boundaries by preserving frag_list rather than refragmenting. |
| 870 | */ |
Florian Westphal | 7a8d831 | 2015-03-05 00:52:36 +0100 | [diff] [blame] | 871 | if (skb->len + mtu_reserved > skb->dev->mtu) { |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 872 | struct brnf_frag_data *data; |
| 873 | |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 874 | frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 875 | if (br_parse_ip_options(skb)) |
| 876 | /* Drop invalid packet */ |
| 877 | return NF_DROP; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 878 | IPCB(skb)->frag_max_size = frag_max_size; |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 879 | |
| 880 | nf_bridge_update_protocol(skb); |
| 881 | |
| 882 | data = this_cpu_ptr(&brnf_frag_data_storage); |
| 883 | data->encap_size = nf_bridge_encap_header_len(skb); |
| 884 | data->size = ETH_HLEN + data->encap_size; |
| 885 | |
| 886 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, |
| 887 | data->size); |
| 888 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 889 | ret = ip_fragment(sk, skb, br_nf_push_frag_xmit); |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 890 | } else { |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame^] | 891 | nf_bridge_info_free(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 892 | ret = br_dev_queue_push_xmit(sk, skb); |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 893 | } |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 894 | |
| 895 | return ret; |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 896 | } |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 897 | #else |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 898 | static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb) |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 899 | { |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame^] | 900 | nf_bridge_info_free(skb); |
| 901 | return br_dev_queue_push_xmit(sk, skb); |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 902 | } |
| 903 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
| 905 | /* PF_BRIDGE/POST_ROUTING ********************************************/ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 906 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
| 907 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 908 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 910 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | struct net_device *realoutdev = bridge_parent(skb->dev); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 912 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Florian Westphal | e4bb9bc | 2015-03-10 10:36:48 +0100 | [diff] [blame] | 914 | /* if nf_bridge is set, but ->physoutdev is NULL, this packet came in |
| 915 | * on a bridge, but was delivered locally and is now being routed: |
| 916 | * |
| 917 | * POST_ROUTING was already invoked from the ip stack. |
| 918 | */ |
| 919 | if (!nf_bridge || !nf_bridge->physoutdev) |
Patrick McHardy | 81d9dda | 2007-11-13 02:58:44 -0800 | [diff] [blame] | 920 | return NF_ACCEPT; |
| 921 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 922 | if (!realoutdev) |
| 923 | return NF_DROP; |
| 924 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 925 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 926 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 927 | 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] | 928 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 929 | else |
| 930 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
| 933 | * about the value of skb->pkt_type. */ |
| 934 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 935 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 936 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
| 938 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 939 | nf_bridge_pull_encap_header(skb); |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 940 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 941 | skb->protocol = htons(ETH_P_IP); |
| 942 | else |
| 943 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 945 | NF_HOOK(pf, NF_INET_POST_ROUTING, state->sk, skb, |
| 946 | NULL, realoutdev, |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 947 | br_nf_dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | |
| 949 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } |
| 951 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | /* IP/SABOTAGE *****************************************************/ |
| 953 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING |
| 954 | * for the second time. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 955 | static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops, |
| 956 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 957 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 959 | if (skb->nf_bridge && |
| 960 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | return NF_STOP; |
| 962 | } |
| 963 | |
| 964 | return NF_ACCEPT; |
| 965 | } |
| 966 | |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 967 | /* This is called when br_netfilter has called into iptables/netfilter, |
| 968 | * and DNAT has taken place on a bridge-forwarded packet. |
| 969 | * |
| 970 | * neigh->output has created a new MAC header, with local br0 MAC |
| 971 | * as saddr. |
| 972 | * |
| 973 | * This restores the original MAC saddr of the bridged packet |
| 974 | * before invoking bridge forward logic to transmit the packet. |
| 975 | */ |
| 976 | static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) |
| 977 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 978 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 979 | |
| 980 | skb_pull(skb, ETH_HLEN); |
| 981 | nf_bridge->mask &= ~BRNF_BRIDGED_DNAT; |
| 982 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 983 | BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN)); |
| 984 | |
| 985 | skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN), |
| 986 | nf_bridge->neigh_header, |
| 987 | ETH_HLEN - ETH_ALEN); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 988 | skb->dev = nf_bridge->physindev; |
Florian Westphal | 7fb48c5 | 2015-05-03 22:05:28 +0200 | [diff] [blame] | 989 | |
| 990 | nf_bridge->physoutdev = NULL; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 991 | br_handle_frame_finish(NULL, skb); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 992 | } |
| 993 | |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 994 | static int br_nf_dev_xmit(struct sk_buff *skb) |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 995 | { |
| 996 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { |
| 997 | br_nf_pre_routing_finish_bridge_slow(skb); |
| 998 | return 1; |
| 999 | } |
| 1000 | return 0; |
| 1001 | } |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1002 | |
| 1003 | static const struct nf_br_ops br_ops = { |
| 1004 | .br_dev_xmit_hook = br_nf_dev_xmit, |
| 1005 | }; |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1006 | |
Pablo Neira Ayuso | 4b7fd5d | 2014-10-02 11:13:21 +0200 | [diff] [blame] | 1007 | void br_netfilter_enable(void) |
| 1008 | { |
| 1009 | } |
| 1010 | EXPORT_SYMBOL_GPL(br_netfilter_enable); |
| 1011 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 1012 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
| 1013 | * br_dev_queue_push_xmit is called afterwards */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 1014 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1015 | { |
| 1016 | .hook = br_nf_pre_routing, |
| 1017 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1018 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1019 | .hooknum = NF_BR_PRE_ROUTING, |
| 1020 | .priority = NF_BR_PRI_BRNF, |
| 1021 | }, |
| 1022 | { |
| 1023 | .hook = br_nf_local_in, |
| 1024 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1025 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1026 | .hooknum = NF_BR_LOCAL_IN, |
| 1027 | .priority = NF_BR_PRI_BRNF, |
| 1028 | }, |
| 1029 | { |
| 1030 | .hook = br_nf_forward_ip, |
| 1031 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1032 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1033 | .hooknum = NF_BR_FORWARD, |
| 1034 | .priority = NF_BR_PRI_BRNF - 1, |
| 1035 | }, |
| 1036 | { |
| 1037 | .hook = br_nf_forward_arp, |
| 1038 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1039 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1040 | .hooknum = NF_BR_FORWARD, |
| 1041 | .priority = NF_BR_PRI_BRNF, |
| 1042 | }, |
| 1043 | { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1044 | .hook = br_nf_post_routing, |
| 1045 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1046 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1047 | .hooknum = NF_BR_POST_ROUTING, |
| 1048 | .priority = NF_BR_PRI_LAST, |
| 1049 | }, |
| 1050 | { |
| 1051 | .hook = ip_sabotage_in, |
| 1052 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1053 | .pf = NFPROTO_IPV4, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1054 | .hooknum = NF_INET_PRE_ROUTING, |
| 1055 | .priority = NF_IP_PRI_FIRST, |
| 1056 | }, |
| 1057 | { |
| 1058 | .hook = ip_sabotage_in, |
| 1059 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1060 | .pf = NFPROTO_IPV6, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1061 | .hooknum = NF_INET_PRE_ROUTING, |
| 1062 | .priority = NF_IP6_PRI_FIRST, |
| 1063 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | }; |
| 1065 | |
| 1066 | #ifdef CONFIG_SYSCTL |
| 1067 | static |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 1068 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
tanxiaojun | 56b148e | 2013-12-19 13:28:13 +0800 | [diff] [blame] | 1069 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | { |
| 1071 | int ret; |
| 1072 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1073 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | |
| 1075 | if (write && *(int *)(ctl->data)) |
| 1076 | *(int *)(ctl->data) = 1; |
| 1077 | return ret; |
| 1078 | } |
| 1079 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 1080 | static struct ctl_table brnf_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | .procname = "bridge-nf-call-arptables", |
| 1083 | .data = &brnf_call_arptables, |
| 1084 | .maxlen = sizeof(int), |
| 1085 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1086 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | }, |
| 1088 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | .procname = "bridge-nf-call-iptables", |
| 1090 | .data = &brnf_call_iptables, |
| 1091 | .maxlen = sizeof(int), |
| 1092 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1093 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | }, |
| 1095 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | .procname = "bridge-nf-call-ip6tables", |
| 1097 | .data = &brnf_call_ip6tables, |
| 1098 | .maxlen = sizeof(int), |
| 1099 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1100 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | }, |
| 1102 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | .procname = "bridge-nf-filter-vlan-tagged", |
| 1104 | .data = &brnf_filter_vlan_tagged, |
| 1105 | .maxlen = sizeof(int), |
| 1106 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1107 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | }, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1109 | { |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1110 | .procname = "bridge-nf-filter-pppoe-tagged", |
| 1111 | .data = &brnf_filter_pppoe_tagged, |
| 1112 | .maxlen = sizeof(int), |
| 1113 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1114 | .proc_handler = brnf_sysctl_call_tables, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1115 | }, |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 1116 | { |
| 1117 | .procname = "bridge-nf-pass-vlan-input-dev", |
| 1118 | .data = &brnf_pass_vlan_indev, |
| 1119 | .maxlen = sizeof(int), |
| 1120 | .mode = 0644, |
| 1121 | .proc_handler = brnf_sysctl_call_tables, |
| 1122 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 1123 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | #endif |
| 1126 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1127 | static int __init br_netfilter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1129 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1131 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1132 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | return ret; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 1134 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 1136 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | if (brnf_sysctl_header == NULL) { |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 1138 | printk(KERN_WARNING |
| 1139 | "br_netfilter: can't register to sysctl.\n"); |
Geert Uytterhoeven | 9672723 | 2015-02-12 15:17:27 +0100 | [diff] [blame] | 1140 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
| 1141 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | } |
| 1143 | #endif |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1144 | RCU_INIT_POINTER(nf_br_ops, &br_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | return 0; |
| 1147 | } |
| 1148 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1149 | static void __exit br_netfilter_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | { |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1151 | RCU_INIT_POINTER(nf_br_ops, NULL); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1152 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | 5dd3df1 | 2012-04-19 13:24:33 +0000 | [diff] [blame] | 1154 | unregister_net_sysctl_table(brnf_sysctl_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | } |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1157 | |
| 1158 | module_init(br_netfilter_init); |
| 1159 | module_exit(br_netfilter_fini); |
| 1160 | |
| 1161 | MODULE_LICENSE("GPL"); |
| 1162 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); |
| 1163 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); |
| 1164 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |