Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Handle firewalling |
| 3 | * Linux ethernet bridge |
| 4 | * |
| 5 | * Authors: |
Bart De Schuymer | 8237908 | 2010-04-13 11:40:41 +0200 | [diff] [blame] | 6 | * Lennert Buytenhek <buytenh@gnu.org> |
| 7 | * Bart De Schuymer <bdschuym@pandora.be> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * Lennert dedicates this file to Kerstin Wurdinger. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/ip.h> |
| 21 | #include <linux/netdevice.h> |
| 22 | #include <linux/skbuff.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 23 | #include <linux/if_arp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/if_ether.h> |
| 25 | #include <linux/if_vlan.h> |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 26 | #include <linux/if_pppox.h> |
| 27 | #include <linux/ppp_defs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/netfilter_bridge.h> |
| 29 | #include <linux/netfilter_ipv4.h> |
| 30 | #include <linux/netfilter_ipv6.h> |
| 31 | #include <linux/netfilter_arp.h> |
| 32 | #include <linux/in_route.h> |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 33 | #include <linux/inetdevice.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <net/ip.h> |
| 36 | #include <net/ipv6.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 37 | #include <net/route.h> |
Florian Westphal | 5676864 | 2014-11-13 10:04:16 +0100 | [diff] [blame] | 38 | #include <net/netfilter/br_netfilter.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include "br_private.h" |
| 42 | #ifdef CONFIG_SYSCTL |
| 43 | #include <linux/sysctl.h> |
| 44 | #endif |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #ifdef CONFIG_SYSCTL |
| 47 | static struct ctl_table_header *brnf_sysctl_header; |
Brian Haley | 9c1ea14 | 2006-09-18 00:03:41 -0700 | [diff] [blame] | 48 | static int brnf_call_iptables __read_mostly = 1; |
| 49 | static int brnf_call_ip6tables __read_mostly = 1; |
| 50 | static int brnf_call_arptables __read_mostly = 1; |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 51 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
| 52 | static int brnf_filter_pppoe_tagged __read_mostly = 0; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 53 | static int brnf_pass_vlan_indev __read_mostly = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #else |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 55 | #define brnf_call_iptables 1 |
| 56 | #define brnf_call_ip6tables 1 |
| 57 | #define brnf_call_arptables 1 |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 58 | #define brnf_filter_vlan_tagged 0 |
| 59 | #define brnf_filter_pppoe_tagged 0 |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 60 | #define brnf_pass_vlan_indev 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #endif |
| 62 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 63 | #define IS_IP(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 64 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 65 | |
| 66 | #define IS_IPV6(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 67 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 68 | |
| 69 | #define IS_ARP(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 70 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 71 | |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 72 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 73 | { |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 74 | if (skb_vlan_tag_present(skb)) |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 75 | return skb->protocol; |
| 76 | else if (skb->protocol == htons(ETH_P_8021Q)) |
| 77 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; |
| 78 | else |
| 79 | return 0; |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | #define IS_VLAN_IP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 83 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 84 | brnf_filter_vlan_tagged) |
| 85 | |
| 86 | #define IS_VLAN_IPV6(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 87 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 88 | brnf_filter_vlan_tagged) |
| 89 | |
| 90 | #define IS_VLAN_ARP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 91 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 92 | brnf_filter_vlan_tagged) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 94 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
| 95 | { |
| 96 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + |
| 97 | sizeof(struct pppoe_hdr))); |
| 98 | } |
| 99 | |
| 100 | #define IS_PPPOE_IP(skb) \ |
| 101 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 102 | pppoe_proto(skb) == htons(PPP_IP) && \ |
| 103 | brnf_filter_pppoe_tagged) |
| 104 | |
| 105 | #define IS_PPPOE_IPV6(skb) \ |
| 106 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 107 | pppoe_proto(skb) == htons(PPP_IPV6) && \ |
| 108 | brnf_filter_pppoe_tagged) |
| 109 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 110 | /* largest possible L2 header, see br_nf_dev_queue_xmit() */ |
| 111 | #define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN) |
| 112 | |
| 113 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
| 114 | struct brnf_frag_data { |
| 115 | char mac[NF_BRIDGE_MAX_MAC_HEADER_LENGTH]; |
| 116 | u8 encap_size; |
| 117 | u8 size; |
| 118 | }; |
| 119 | |
| 120 | static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage); |
| 121 | #endif |
| 122 | |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 123 | static struct nf_bridge_info *nf_bridge_info_get(const struct sk_buff *skb) |
| 124 | { |
| 125 | return skb->nf_bridge; |
| 126 | } |
| 127 | |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 128 | static void nf_bridge_info_free(struct sk_buff *skb) |
| 129 | { |
| 130 | if (skb->nf_bridge) { |
| 131 | nf_bridge_put(skb->nf_bridge); |
| 132 | skb->nf_bridge = NULL; |
| 133 | } |
| 134 | } |
| 135 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 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 | |
Florian Westphal | 8d04516 | 2015-03-18 20:55:31 +0100 | [diff] [blame] | 178 | static unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) |
| 179 | { |
| 180 | switch (skb->protocol) { |
| 181 | case __cpu_to_be16(ETH_P_8021Q): |
| 182 | return VLAN_HLEN; |
| 183 | case __cpu_to_be16(ETH_P_PPP_SES): |
| 184 | return PPPOE_SES_HLEN; |
| 185 | default: |
| 186 | return 0; |
| 187 | } |
| 188 | } |
| 189 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 190 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
| 191 | { |
| 192 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 193 | |
| 194 | skb_push(skb, len); |
| 195 | skb->network_header -= len; |
| 196 | } |
| 197 | |
| 198 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
| 199 | { |
| 200 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 201 | |
| 202 | skb_pull(skb, len); |
| 203 | skb->network_header += len; |
| 204 | } |
| 205 | |
| 206 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
| 207 | { |
| 208 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 209 | |
| 210 | skb_pull_rcsum(skb, len); |
| 211 | skb->network_header += len; |
| 212 | } |
| 213 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 214 | /* When handing a packet over to the IP layer |
| 215 | * check whether we have a skb that is in the |
| 216 | * expected format |
| 217 | */ |
| 218 | |
stephen hemminger | d028023 | 2010-10-18 14:03:21 +0000 | [diff] [blame] | 219 | static int br_parse_ip_options(struct sk_buff *skb) |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 220 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 221 | const struct iphdr *iph; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 222 | struct net_device *dev = skb->dev; |
| 223 | u32 len; |
| 224 | |
Sarveshwar Bandi | 6caab7b | 2012-10-10 01:15:01 +0000 | [diff] [blame] | 225 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 226 | goto inhdr_error; |
| 227 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 228 | iph = ip_hdr(skb); |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 229 | |
| 230 | /* Basic sanity checks */ |
| 231 | if (iph->ihl < 5 || iph->version != 4) |
| 232 | goto inhdr_error; |
| 233 | |
| 234 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 235 | goto inhdr_error; |
| 236 | |
| 237 | iph = ip_hdr(skb); |
| 238 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
| 239 | goto inhdr_error; |
| 240 | |
| 241 | len = ntohs(iph->tot_len); |
| 242 | if (skb->len < len) { |
| 243 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); |
| 244 | goto drop; |
| 245 | } else if (len < (iph->ihl*4)) |
| 246 | goto inhdr_error; |
| 247 | |
| 248 | if (pskb_trim_rcsum(skb, len)) { |
| 249 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
| 250 | goto drop; |
| 251 | } |
| 252 | |
Eric Dumazet | f8e9881 | 2011-04-12 13:39:14 -0700 | [diff] [blame] | 253 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
Herbert Xu | 7677e86 | 2014-10-04 22:18:02 +0800 | [diff] [blame] | 254 | /* We should really parse IP options here but until |
| 255 | * somebody who actually uses IP options complains to |
| 256 | * us we'll just silently ignore the options because |
| 257 | * we're lazy! |
| 258 | */ |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 259 | return 0; |
| 260 | |
| 261 | inhdr_error: |
| 262 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); |
| 263 | drop: |
| 264 | return -1; |
| 265 | } |
| 266 | |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 267 | static void nf_bridge_update_protocol(struct sk_buff *skb) |
| 268 | { |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 269 | switch (skb->nf_bridge->orig_proto) { |
| 270 | case BRNF_PROTO_8021Q: |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 271 | skb->protocol = htons(ETH_P_8021Q); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 272 | break; |
| 273 | case BRNF_PROTO_PPPOE: |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 274 | skb->protocol = htons(ETH_P_PPP_SES); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 275 | break; |
| 276 | case BRNF_PROTO_UNCHANGED: |
| 277 | break; |
| 278 | } |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 279 | } |
| 280 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 281 | /* Obtain the correct destination MAC address, while preserving the original |
| 282 | * source MAC address. If we already know this address, we just copy it. If we |
| 283 | * don't, we use the neighbour framework to find out. In both cases, we make |
| 284 | * sure that br_handle_frame_finish() is called afterwards. |
| 285 | */ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 286 | 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] | 287 | { |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 288 | struct neighbour *neigh; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 289 | struct dst_entry *dst; |
| 290 | |
| 291 | skb->dev = bridge_parent(skb->dev); |
| 292 | if (!skb->dev) |
| 293 | goto free_skb; |
| 294 | dst = skb_dst(skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 295 | neigh = dst_neigh_lookup_skb(dst, skb); |
| 296 | if (neigh) { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 297 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 298 | int ret; |
| 299 | |
| 300 | if (neigh->hh.hh_len) { |
| 301 | neigh_hh_bridge(&neigh->hh, skb); |
| 302 | skb->dev = nf_bridge->physindev; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 303 | ret = br_handle_frame_finish(sk, skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 304 | } else { |
| 305 | /* the neighbour function below overwrites the complete |
| 306 | * MAC header, so we save the Ethernet source address and |
| 307 | * protocol number. |
| 308 | */ |
| 309 | skb_copy_from_linear_data_offset(skb, |
| 310 | -(ETH_HLEN-ETH_ALEN), |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 311 | nf_bridge->neigh_header, |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 312 | ETH_HLEN-ETH_ALEN); |
| 313 | /* tell br_dev_xmit to continue with forwarding */ |
| 314 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 315 | /* FIXME Need to refragment */ |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 316 | ret = neigh->output(neigh, skb); |
| 317 | } |
| 318 | neigh_release(neigh); |
| 319 | return ret; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 320 | } |
| 321 | free_skb: |
| 322 | kfree_skb(skb); |
| 323 | return 0; |
| 324 | } |
| 325 | |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 326 | static bool daddr_was_changed(const struct sk_buff *skb, |
| 327 | const struct nf_bridge_info *nf_bridge) |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 328 | { |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 329 | return ip_hdr(skb)->daddr != nf_bridge->ipv4_daddr; |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 330 | } |
| 331 | |
Bernhard Thaler | 8cae308 | 2015-05-30 15:26:57 +0200 | [diff] [blame^] | 332 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
| 333 | /* Undo the changes made for ip6tables PREROUTING and continue the |
| 334 | * bridge PRE_ROUTING hook. |
| 335 | */ |
| 336 | static int br_nf_pre_routing_finish_ipv6(struct sock *sk, struct sk_buff *skb) |
| 337 | { |
| 338 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
| 339 | struct rtable *rt; |
| 340 | |
| 341 | if (nf_bridge->pkt_otherhost) { |
| 342 | skb->pkt_type = PACKET_OTHERHOST; |
| 343 | nf_bridge->pkt_otherhost = false; |
| 344 | } |
| 345 | nf_bridge->mask &= ~BRNF_NF_BRIDGE_PREROUTING; |
| 346 | |
| 347 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 348 | if (!rt) { |
| 349 | kfree_skb(skb); |
| 350 | return 0; |
| 351 | } |
| 352 | skb_dst_set_noref(skb, &rt->dst); |
| 353 | |
| 354 | skb->dev = nf_bridge->physindev; |
| 355 | nf_bridge_update_protocol(skb); |
| 356 | nf_bridge_push_encap_header(skb); |
| 357 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, sk, skb, |
| 358 | skb->dev, NULL, |
| 359 | br_handle_frame_finish, 1); |
| 360 | |
| 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. |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 366 | * This is also true when SNAT takes place (for the reply direction). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | * |
| 368 | * There are two cases to consider: |
| 369 | * 1. The packet was DNAT'ed to a device in the same bridge |
| 370 | * port group as it was received on. We can still bridge |
| 371 | * the packet. |
| 372 | * 2. The packet was DNAT'ed to a different device, either |
| 373 | * a non-bridged device or another bridge port group. |
| 374 | * The packet will need to be routed. |
| 375 | * |
| 376 | * The correct way of distinguishing between these two cases is to |
| 377 | * call ip_route_input() and to look at skb->dst->dev, which is |
| 378 | * changed to the destination device if ip_route_input() succeeds. |
| 379 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 380 | * Let's first consider the case that ip_route_input() succeeds: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 382 | * If the output device equals the logical bridge device the packet |
| 383 | * came in on, we can consider this bridging. The corresponding MAC |
| 384 | * address will be obtained in br_nf_pre_routing_finish_bridge. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | * Otherwise, the packet is considered to be routed and we just |
| 386 | * change the destination MAC address so that the packet will |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 387 | * later be passed up to the IP stack to be routed. For a redirected |
| 388 | * packet, ip_route_input() will give back the localhost as output device, |
| 389 | * which differs from the bridge device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 391 | * Let's now consider the case that ip_route_input() fails: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | * |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 393 | * This can be because the destination address is martian, in which case |
| 394 | * the packet will be dropped. |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 395 | * If IP forwarding is disabled, ip_route_input() will fail, while |
| 396 | * ip_route_output_key() can return success. The source |
| 397 | * 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] | 398 | * 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] | 399 | * if IP forwarding is enabled. If the output device equals the logical bridge |
| 400 | * device, we proceed as if ip_route_input() succeeded. If it differs from the |
| 401 | * logical bridge port or if ip_route_output_key() fails we drop the packet. |
| 402 | */ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 403 | 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] | 404 | { |
| 405 | struct net_device *dev = skb->dev; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 406 | struct iphdr *iph = ip_hdr(skb); |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 407 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 408 | struct rtable *rt; |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 409 | int err; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 410 | int frag_max_size; |
| 411 | |
| 412 | frag_max_size = IPCB(skb)->frag_max_size; |
| 413 | BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 415 | if (nf_bridge->pkt_otherhost) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | skb->pkt_type = PACKET_OTHERHOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 417 | nf_bridge->pkt_otherhost = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
Bernhard Thaler | d39a33e | 2015-05-30 15:26:13 +0200 | [diff] [blame] | 419 | nf_bridge->mask &= ~BRNF_NF_BRIDGE_PREROUTING; |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 420 | if (daddr_was_changed(skb, nf_bridge)) { |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 421 | 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] | 422 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 423 | |
| 424 | /* If err equals -EHOSTUNREACH the error is due to a |
| 425 | * martian destination or due to the fact that |
| 426 | * forwarding is disabled. For most martian packets, |
| 427 | * ip_route_output_key() will fail. It won't fail for 2 types of |
| 428 | * martian destinations: loopback destinations and destination |
| 429 | * 0.0.0.0. In both cases the packet will be dropped because the |
| 430 | * destination is the loopback device and not the bridge. */ |
| 431 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) |
| 432 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
David S. Miller | 78fbfd8 | 2011-03-12 00:00:52 -0500 | [diff] [blame] | 434 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
| 435 | RT_TOS(iph->tos), 0); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 436 | if (!IS_ERR(rt)) { |
Bart De Schuymer | 1c011be | 2005-09-14 20:55:16 -0700 | [diff] [blame] | 437 | /* - Bridged-and-DNAT'ed traffic doesn't |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 438 | * require ip_forwarding. */ |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 439 | if (rt->dst.dev == dev) { |
| 440 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | goto bridged_dnat; |
| 442 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 443 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | } |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 445 | free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | kfree_skb(skb); |
| 447 | return 0; |
| 448 | } else { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 449 | if (skb_dst(skb)->dev == dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | bridged_dnat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 452 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 453 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 454 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
| 455 | NF_BR_PRE_ROUTING, |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 456 | sk, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | br_nf_pre_routing_finish_bridge, |
| 458 | 1); |
| 459 | return 0; |
| 460 | } |
Joe Perches | 0409114 | 2014-02-23 00:05:26 -0800 | [diff] [blame] | 461 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | skb->pkt_type = PACKET_HOST; |
| 463 | } |
| 464 | } else { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 465 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 466 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 467 | kfree_skb(skb); |
| 468 | return 0; |
| 469 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 470 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | |
| 473 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 474 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 475 | nf_bridge_push_encap_header(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 476 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, sk, skb, |
| 477 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | br_handle_frame_finish, 1); |
| 479 | |
| 480 | return 0; |
| 481 | } |
| 482 | |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 483 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
| 484 | { |
| 485 | struct net_device *vlan, *br; |
| 486 | |
| 487 | br = bridge_parent(dev); |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 488 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 489 | return br; |
| 490 | |
dingtianhong | f06c7f9 | 2014-05-09 14:58:05 +0800 | [diff] [blame] | 491 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 492 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 493 | |
| 494 | return vlan ? vlan : br; |
| 495 | } |
| 496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | /* Some common code for IPv4/IPv6 */ |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 498 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 500 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
| 502 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 503 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 504 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; |
| 508 | nf_bridge->physindev = skb->dev; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 509 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 510 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 511 | if (skb->protocol == htons(ETH_P_8021Q)) |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 512 | nf_bridge->orig_proto = BRNF_PROTO_8021Q; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 513 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 514 | nf_bridge->orig_proto = BRNF_PROTO_PPPOE; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 515 | |
Florian Westphal | 6b8dbcf | 2013-10-24 21:32:42 +0200 | [diff] [blame] | 516 | /* Must drop socket now because of tproxy. */ |
| 517 | skb_orphan(skb); |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 518 | return skb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | } |
| 520 | |
| 521 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ |
| 522 | static int check_hbh_len(struct sk_buff *skb) |
| 523 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 524 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | u32 pkt_len; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 526 | const unsigned char *nh = skb_network_header(skb); |
| 527 | int off = raw - nh; |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 528 | int len = (raw[1] + 1) << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
| 530 | if ((raw + len) - skb->data > skb_headlen(skb)) |
| 531 | goto bad; |
| 532 | |
| 533 | off += 2; |
| 534 | len -= 2; |
| 535 | |
| 536 | while (len > 0) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 537 | int optlen = nh[off + 1] + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 539 | switch (nh[off]) { |
Eldad Zack | 1de5a71 | 2012-05-17 06:00:25 +0000 | [diff] [blame] | 540 | case IPV6_TLV_PAD1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | optlen = 1; |
| 542 | break; |
| 543 | |
| 544 | case IPV6_TLV_PADN: |
| 545 | break; |
| 546 | |
| 547 | case IPV6_TLV_JUMBO: |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 548 | if (nh[off + 1] != 4 || (off & 3) != 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 550 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 551 | if (pkt_len <= IPV6_MAXPLEN || |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 552 | ipv6_hdr(skb)->payload_len) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 553 | goto bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
| 555 | goto bad; |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 556 | if (pskb_trim_rcsum(skb, |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 557 | pkt_len + sizeof(struct ipv6hdr))) |
Bart De Schuymer | b036648 | 2005-12-19 14:00:08 -0800 | [diff] [blame] | 558 | goto bad; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 559 | nh = skb_network_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | break; |
| 561 | default: |
| 562 | if (optlen > len) |
| 563 | goto bad; |
| 564 | break; |
| 565 | } |
| 566 | off += optlen; |
| 567 | len -= optlen; |
| 568 | } |
| 569 | if (len == 0) |
| 570 | return 0; |
| 571 | bad: |
| 572 | return -1; |
| 573 | |
| 574 | } |
| 575 | |
| 576 | /* Replicate the checks that IPv6 does on packet reception and pass the packet |
| 577 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 578 | 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] | 579 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 580 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 582 | const struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | u32 pkt_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
| 585 | if (skb->len < sizeof(struct ipv6hdr)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 586 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 589 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 591 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
| 593 | if (hdr->version != 6) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 594 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
| 596 | pkt_len = ntohs(hdr->payload_len); |
| 597 | |
| 598 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
| 599 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 600 | return NF_DROP; |
Herbert Xu | b38dfee | 2006-06-09 16:13:01 -0700 | [diff] [blame] | 601 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 602 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | } |
| 604 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 605 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 607 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 608 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 610 | if (!setup_pre_routing(skb)) |
| 611 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 613 | skb->protocol = htons(ETH_P_IPV6); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 614 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, state->sk, skb, |
| 615 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | br_nf_pre_routing_finish_ipv6); |
| 617 | |
| 618 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
| 622 | * Replicate the checks that IPv4 does on packet reception. |
| 623 | * Set skb->dev to the bridge device (i.e. parent of the |
| 624 | * receiving device) to make netfilter happy, the REDIRECT |
| 625 | * target in particular. Save the original destination IP |
| 626 | * address to be able to detect DNAT afterwards. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 627 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
| 628 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 629 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | { |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 631 | struct nf_bridge_info *nf_bridge; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 632 | struct net_bridge_port *p; |
| 633 | struct net_bridge *br; |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 634 | __u32 len = nf_bridge_encap_header_len(skb); |
| 635 | |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 636 | if (unlikely(!pskb_may_pull(skb, len))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 637 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 639 | p = br_port_get_rcu(state->in); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 640 | if (p == NULL) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 641 | return NF_DROP; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 642 | br = p->br; |
| 643 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 644 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 645 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 647 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 648 | nf_bridge_pull_encap_header_rcsum(skb); |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 649 | return br_nf_pre_routing_ipv6(ops, skb, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | } |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 651 | |
| 652 | if (!brnf_call_iptables && !br->nf_call_iptables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 655 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | return NF_ACCEPT; |
| 657 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 658 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 660 | if (br_parse_ip_options(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 661 | return NF_DROP; |
Herbert Xu | 1776206 | 2010-07-05 21:29:28 +0000 | [diff] [blame] | 662 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 663 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 664 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 666 | if (!setup_pre_routing(skb)) |
| 667 | return NF_DROP; |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 668 | |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 669 | nf_bridge = nf_bridge_info_get(skb); |
| 670 | nf_bridge->ipv4_daddr = ip_hdr(skb)->daddr; |
| 671 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 672 | skb->protocol = htons(ETH_P_IP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 674 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->sk, skb, |
| 675 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | br_nf_pre_routing_finish); |
| 677 | |
| 678 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
| 680 | |
| 681 | |
| 682 | /* PF_BRIDGE/LOCAL_IN ************************************************/ |
| 683 | /* The packet is locally destined, which requires a real |
| 684 | * dst_entry, so detach the fake one. On the way up, the |
| 685 | * packet would pass through PRE_ROUTING again (which already |
| 686 | * took place when the packet entered the bridge), but we |
| 687 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will |
| 688 | * prevent this from happening. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 689 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
| 690 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 691 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | { |
Peter Huang (Peng) | a881e96 | 2012-04-19 20:12:51 +0000 | [diff] [blame] | 693 | br_drop_fake_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | return NF_ACCEPT; |
| 695 | } |
| 696 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | /* PF_BRIDGE/FORWARD *************************************************/ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 698 | 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] | 699 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 700 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | struct net_device *in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 703 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 704 | int frag_max_size; |
| 705 | |
| 706 | if (skb->protocol == htons(ETH_P_IP)) { |
| 707 | frag_max_size = IPCB(skb)->frag_max_size; |
| 708 | BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; |
| 709 | } |
| 710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | in = nf_bridge->physindev; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 712 | if (nf_bridge->pkt_otherhost) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | skb->pkt_type = PACKET_OTHERHOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 714 | nf_bridge->pkt_otherhost = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | } |
Bart De Schuymer | e94c674 | 2010-05-13 14:55:34 +0200 | [diff] [blame] | 716 | nf_bridge_update_protocol(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } else { |
| 718 | in = *((struct net_device **)(skb->cb)); |
| 719 | } |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 720 | nf_bridge_push_encap_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 721 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 722 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, sk, skb, |
| 723 | in, skb->dev, br_forward_finish, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return 0; |
| 725 | } |
| 726 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
| 729 | * netfilter with indev and outdev set to the bridge device, |
| 730 | * but we are still able to filter on the 'real' indev/outdev |
| 731 | * because of the physdev module. For ARP, indev and outdev are the |
| 732 | * bridge ports. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 733 | static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops, |
| 734 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 735 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | struct nf_bridge_info *nf_bridge; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 738 | struct net_device *parent; |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 739 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
| 741 | if (!skb->nf_bridge) |
| 742 | return NF_ACCEPT; |
| 743 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 744 | /* Need exclusive nf_bridge_info since we might have multiple |
| 745 | * different physoutdevs. */ |
| 746 | if (!nf_bridge_unshare(skb)) |
| 747 | return NF_DROP; |
| 748 | |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 749 | nf_bridge = nf_bridge_info_get(skb); |
| 750 | if (!nf_bridge) |
| 751 | return NF_DROP; |
| 752 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 753 | parent = bridge_parent(state->out); |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 754 | if (!parent) |
| 755 | return NF_DROP; |
| 756 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 757 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 758 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 759 | 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] | 760 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 761 | else |
| 762 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 764 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 767 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 768 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
| 770 | |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 771 | if (pf == NFPROTO_IPV4) { |
| 772 | int frag_max = BR_INPUT_SKB_CB(skb)->frag_max_size; |
| 773 | |
| 774 | if (br_parse_ip_options(skb)) |
| 775 | return NF_DROP; |
| 776 | |
| 777 | IPCB(skb)->frag_max_size = frag_max; |
| 778 | } |
Herbert Xu | 6b1e960 | 2011-03-18 05:27:28 +0000 | [diff] [blame] | 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | nf_bridge->physoutdev = skb->dev; |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 781 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 782 | skb->protocol = htons(ETH_P_IP); |
| 783 | else |
| 784 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 786 | NF_HOOK(pf, NF_INET_FORWARD, NULL, skb, |
| 787 | brnf_get_logical_dev(skb, state->in), |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 788 | parent, br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
| 790 | return NF_STOLEN; |
| 791 | } |
| 792 | |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 793 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
| 794 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 795 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 797 | struct net_bridge_port *p; |
| 798 | struct net_bridge *br; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | struct net_device **d = (struct net_device **)(skb->cb); |
| 800 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 801 | p = br_port_get_rcu(state->out); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 802 | if (p == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 804 | br = p->br; |
| 805 | |
| 806 | if (!brnf_call_arptables && !br->nf_call_arptables) |
| 807 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 809 | if (!IS_ARP(skb)) { |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 810 | if (!IS_VLAN_ARP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | return NF_ACCEPT; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 812 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | } |
| 814 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 815 | if (arp_hdr(skb)->ar_pln != 4) { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 816 | if (IS_VLAN_ARP(skb)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 817 | nf_bridge_push_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | return NF_ACCEPT; |
| 819 | } |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 820 | *d = state->in; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 821 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, state->sk, skb, |
| 822 | state->in, state->out, br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
| 824 | return NF_STOLEN; |
| 825 | } |
| 826 | |
Vasily Averin | aff09ce | 2014-05-05 00:17:48 +0400 | [diff] [blame] | 827 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 828 | 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] | 829 | { |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 830 | struct brnf_frag_data *data; |
| 831 | int err; |
| 832 | |
| 833 | data = this_cpu_ptr(&brnf_frag_data_storage); |
| 834 | err = skb_cow_head(skb, data->size); |
| 835 | |
| 836 | if (err) { |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame] | 837 | kfree_skb(skb); |
| 838 | return 0; |
| 839 | } |
| 840 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 841 | skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size); |
| 842 | __skb_push(skb, data->encap_size); |
| 843 | |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 844 | nf_bridge_info_free(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 845 | return br_dev_queue_push_xmit(sk, skb); |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame] | 846 | } |
| 847 | |
Andy Zhou | 49d16b2 | 2015-05-15 14:15:37 -0700 | [diff] [blame] | 848 | static int br_nf_ip_fragment(struct sock *sk, struct sk_buff *skb, |
| 849 | int (*output)(struct sock *, struct sk_buff *)) |
| 850 | { |
| 851 | unsigned int mtu = ip_skb_dst_mtu(skb); |
| 852 | struct iphdr *iph = ip_hdr(skb); |
| 853 | struct rtable *rt = skb_rtable(skb); |
| 854 | struct net_device *dev = rt->dst.dev; |
| 855 | |
| 856 | if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || |
| 857 | (IPCB(skb)->frag_max_size && |
| 858 | IPCB(skb)->frag_max_size > mtu))) { |
| 859 | IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
| 860 | kfree_skb(skb); |
| 861 | return -EMSGSIZE; |
| 862 | } |
| 863 | |
| 864 | return ip_do_fragment(sk, skb, output); |
| 865 | } |
| 866 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 867 | 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] | 868 | { |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 869 | int ret; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 870 | int frag_max_size; |
Florian Westphal | 7a8d831 | 2015-03-05 00:52:36 +0100 | [diff] [blame] | 871 | unsigned int mtu_reserved; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 872 | |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 873 | if (skb_is_gso(skb) || skb->protocol != htons(ETH_P_IP)) { |
| 874 | nf_bridge_info_free(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 875 | return br_dev_queue_push_xmit(sk, skb); |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 876 | } |
Florian Westphal | 7a8d831 | 2015-03-05 00:52:36 +0100 | [diff] [blame] | 877 | |
| 878 | mtu_reserved = nf_bridge_mtu_reduction(skb); |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 879 | /* This is wrong! We should preserve the original fragment |
| 880 | * boundaries by preserving frag_list rather than refragmenting. |
| 881 | */ |
Florian Westphal | 7a8d831 | 2015-03-05 00:52:36 +0100 | [diff] [blame] | 882 | if (skb->len + mtu_reserved > skb->dev->mtu) { |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 883 | struct brnf_frag_data *data; |
| 884 | |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 885 | frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 886 | if (br_parse_ip_options(skb)) |
| 887 | /* Drop invalid packet */ |
| 888 | return NF_DROP; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 889 | IPCB(skb)->frag_max_size = frag_max_size; |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 890 | |
| 891 | nf_bridge_update_protocol(skb); |
| 892 | |
| 893 | data = this_cpu_ptr(&brnf_frag_data_storage); |
| 894 | data->encap_size = nf_bridge_encap_header_len(skb); |
| 895 | data->size = ETH_HLEN + data->encap_size; |
| 896 | |
| 897 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, |
| 898 | data->size); |
| 899 | |
Andy Zhou | 49d16b2 | 2015-05-15 14:15:37 -0700 | [diff] [blame] | 900 | ret = br_nf_ip_fragment(sk, skb, br_nf_push_frag_xmit); |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 901 | } else { |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 902 | nf_bridge_info_free(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 903 | ret = br_dev_queue_push_xmit(sk, skb); |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 904 | } |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 905 | |
| 906 | return ret; |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 907 | } |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 908 | #else |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 909 | 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] | 910 | { |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 911 | nf_bridge_info_free(skb); |
| 912 | return br_dev_queue_push_xmit(sk, skb); |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 913 | } |
| 914 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
| 916 | /* PF_BRIDGE/POST_ROUTING ********************************************/ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 917 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
| 918 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 919 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 921 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | struct net_device *realoutdev = bridge_parent(skb->dev); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 923 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
Florian Westphal | e4bb9bc | 2015-03-10 10:36:48 +0100 | [diff] [blame] | 925 | /* if nf_bridge is set, but ->physoutdev is NULL, this packet came in |
| 926 | * on a bridge, but was delivered locally and is now being routed: |
| 927 | * |
| 928 | * POST_ROUTING was already invoked from the ip stack. |
| 929 | */ |
| 930 | if (!nf_bridge || !nf_bridge->physoutdev) |
Patrick McHardy | 81d9dda | 2007-11-13 02:58:44 -0800 | [diff] [blame] | 931 | return NF_ACCEPT; |
| 932 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 933 | if (!realoutdev) |
| 934 | return NF_DROP; |
| 935 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 936 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 937 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 938 | 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] | 939 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 940 | else |
| 941 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
| 944 | * about the value of skb->pkt_type. */ |
| 945 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 946 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 947 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | } |
| 949 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 950 | nf_bridge_pull_encap_header(skb); |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 951 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 952 | skb->protocol = htons(ETH_P_IP); |
| 953 | else |
| 954 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 956 | NF_HOOK(pf, NF_INET_POST_ROUTING, state->sk, skb, |
| 957 | NULL, realoutdev, |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 958 | br_nf_dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
| 960 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | } |
| 962 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | /* IP/SABOTAGE *****************************************************/ |
| 964 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING |
| 965 | * for the second time. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 966 | static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops, |
| 967 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 968 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 970 | if (skb->nf_bridge && |
| 971 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | return NF_STOP; |
| 973 | } |
| 974 | |
| 975 | return NF_ACCEPT; |
| 976 | } |
| 977 | |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 978 | /* This is called when br_netfilter has called into iptables/netfilter, |
| 979 | * and DNAT has taken place on a bridge-forwarded packet. |
| 980 | * |
| 981 | * neigh->output has created a new MAC header, with local br0 MAC |
| 982 | * as saddr. |
| 983 | * |
| 984 | * This restores the original MAC saddr of the bridged packet |
| 985 | * before invoking bridge forward logic to transmit the packet. |
| 986 | */ |
| 987 | static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) |
| 988 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 989 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 990 | |
| 991 | skb_pull(skb, ETH_HLEN); |
| 992 | nf_bridge->mask &= ~BRNF_BRIDGED_DNAT; |
| 993 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 994 | BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN)); |
| 995 | |
| 996 | skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN), |
| 997 | nf_bridge->neigh_header, |
| 998 | ETH_HLEN - ETH_ALEN); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 999 | skb->dev = nf_bridge->physindev; |
Florian Westphal | 7fb48c5 | 2015-05-03 22:05:28 +0200 | [diff] [blame] | 1000 | |
| 1001 | nf_bridge->physoutdev = NULL; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 1002 | br_handle_frame_finish(NULL, skb); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1003 | } |
| 1004 | |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1005 | static int br_nf_dev_xmit(struct sk_buff *skb) |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1006 | { |
| 1007 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { |
| 1008 | br_nf_pre_routing_finish_bridge_slow(skb); |
| 1009 | return 1; |
| 1010 | } |
| 1011 | return 0; |
| 1012 | } |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1013 | |
| 1014 | static const struct nf_br_ops br_ops = { |
| 1015 | .br_dev_xmit_hook = br_nf_dev_xmit, |
| 1016 | }; |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1017 | |
Pablo Neira Ayuso | 4b7fd5d | 2014-10-02 11:13:21 +0200 | [diff] [blame] | 1018 | void br_netfilter_enable(void) |
| 1019 | { |
| 1020 | } |
| 1021 | EXPORT_SYMBOL_GPL(br_netfilter_enable); |
| 1022 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 1023 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
| 1024 | * br_dev_queue_push_xmit is called afterwards */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 1025 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1026 | { |
| 1027 | .hook = br_nf_pre_routing, |
| 1028 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1029 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1030 | .hooknum = NF_BR_PRE_ROUTING, |
| 1031 | .priority = NF_BR_PRI_BRNF, |
| 1032 | }, |
| 1033 | { |
| 1034 | .hook = br_nf_local_in, |
| 1035 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1036 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1037 | .hooknum = NF_BR_LOCAL_IN, |
| 1038 | .priority = NF_BR_PRI_BRNF, |
| 1039 | }, |
| 1040 | { |
| 1041 | .hook = br_nf_forward_ip, |
| 1042 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1043 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1044 | .hooknum = NF_BR_FORWARD, |
| 1045 | .priority = NF_BR_PRI_BRNF - 1, |
| 1046 | }, |
| 1047 | { |
| 1048 | .hook = br_nf_forward_arp, |
| 1049 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1050 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1051 | .hooknum = NF_BR_FORWARD, |
| 1052 | .priority = NF_BR_PRI_BRNF, |
| 1053 | }, |
| 1054 | { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1055 | .hook = br_nf_post_routing, |
| 1056 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1057 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1058 | .hooknum = NF_BR_POST_ROUTING, |
| 1059 | .priority = NF_BR_PRI_LAST, |
| 1060 | }, |
| 1061 | { |
| 1062 | .hook = ip_sabotage_in, |
| 1063 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1064 | .pf = NFPROTO_IPV4, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1065 | .hooknum = NF_INET_PRE_ROUTING, |
| 1066 | .priority = NF_IP_PRI_FIRST, |
| 1067 | }, |
| 1068 | { |
| 1069 | .hook = ip_sabotage_in, |
| 1070 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1071 | .pf = NFPROTO_IPV6, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1072 | .hooknum = NF_INET_PRE_ROUTING, |
| 1073 | .priority = NF_IP6_PRI_FIRST, |
| 1074 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | }; |
| 1076 | |
| 1077 | #ifdef CONFIG_SYSCTL |
| 1078 | static |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 1079 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
tanxiaojun | 56b148e | 2013-12-19 13:28:13 +0800 | [diff] [blame] | 1080 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | { |
| 1082 | int ret; |
| 1083 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1084 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
| 1086 | if (write && *(int *)(ctl->data)) |
| 1087 | *(int *)(ctl->data) = 1; |
| 1088 | return ret; |
| 1089 | } |
| 1090 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 1091 | static struct ctl_table brnf_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | .procname = "bridge-nf-call-arptables", |
| 1094 | .data = &brnf_call_arptables, |
| 1095 | .maxlen = sizeof(int), |
| 1096 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1097 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | }, |
| 1099 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | .procname = "bridge-nf-call-iptables", |
| 1101 | .data = &brnf_call_iptables, |
| 1102 | .maxlen = sizeof(int), |
| 1103 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1104 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | }, |
| 1106 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | .procname = "bridge-nf-call-ip6tables", |
| 1108 | .data = &brnf_call_ip6tables, |
| 1109 | .maxlen = sizeof(int), |
| 1110 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1111 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | }, |
| 1113 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | .procname = "bridge-nf-filter-vlan-tagged", |
| 1115 | .data = &brnf_filter_vlan_tagged, |
| 1116 | .maxlen = sizeof(int), |
| 1117 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1118 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | }, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1120 | { |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1121 | .procname = "bridge-nf-filter-pppoe-tagged", |
| 1122 | .data = &brnf_filter_pppoe_tagged, |
| 1123 | .maxlen = sizeof(int), |
| 1124 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1125 | .proc_handler = brnf_sysctl_call_tables, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1126 | }, |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 1127 | { |
| 1128 | .procname = "bridge-nf-pass-vlan-input-dev", |
| 1129 | .data = &brnf_pass_vlan_indev, |
| 1130 | .maxlen = sizeof(int), |
| 1131 | .mode = 0644, |
| 1132 | .proc_handler = brnf_sysctl_call_tables, |
| 1133 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 1134 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | #endif |
| 1137 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1138 | static int __init br_netfilter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1140 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1142 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1143 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | return ret; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 1145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 1147 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | if (brnf_sysctl_header == NULL) { |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 1149 | printk(KERN_WARNING |
| 1150 | "br_netfilter: can't register to sysctl.\n"); |
Geert Uytterhoeven | 9672723 | 2015-02-12 15:17:27 +0100 | [diff] [blame] | 1151 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
| 1152 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | } |
| 1154 | #endif |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1155 | RCU_INIT_POINTER(nf_br_ops, &br_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | return 0; |
| 1158 | } |
| 1159 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1160 | static void __exit br_netfilter_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | { |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1162 | RCU_INIT_POINTER(nf_br_ops, NULL); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1163 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | 5dd3df1 | 2012-04-19 13:24:33 +0000 | [diff] [blame] | 1165 | unregister_net_sysctl_table(brnf_sysctl_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | } |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1168 | |
| 1169 | module_init(br_netfilter_init); |
| 1170 | module_exit(br_netfilter_fini); |
| 1171 | |
| 1172 | MODULE_LICENSE("GPL"); |
| 1173 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); |
| 1174 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); |
| 1175 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |