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> |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 37 | #include <net/addrconf.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 38 | #include <net/route.h> |
Florian Westphal | 5676864 | 2014-11-13 10:04:16 +0100 | [diff] [blame] | 39 | #include <net/netfilter/br_netfilter.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include "br_private.h" |
| 43 | #ifdef CONFIG_SYSCTL |
| 44 | #include <linux/sysctl.h> |
| 45 | #endif |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #ifdef CONFIG_SYSCTL |
| 48 | static struct ctl_table_header *brnf_sysctl_header; |
Brian Haley | 9c1ea14 | 2006-09-18 00:03:41 -0700 | [diff] [blame] | 49 | static int brnf_call_iptables __read_mostly = 1; |
| 50 | static int brnf_call_ip6tables __read_mostly = 1; |
| 51 | static int brnf_call_arptables __read_mostly = 1; |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 52 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
| 53 | static int brnf_filter_pppoe_tagged __read_mostly = 0; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 54 | static int brnf_pass_vlan_indev __read_mostly = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #else |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 56 | #define brnf_call_iptables 1 |
| 57 | #define brnf_call_ip6tables 1 |
| 58 | #define brnf_call_arptables 1 |
Herbert Xu | 47e0e1c | 2009-01-12 00:06:03 +0000 | [diff] [blame] | 59 | #define brnf_filter_vlan_tagged 0 |
| 60 | #define brnf_filter_pppoe_tagged 0 |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 61 | #define brnf_pass_vlan_indev 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #endif |
| 63 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 64 | #define IS_IP(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 65 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 66 | |
| 67 | #define IS_IPV6(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 68 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 69 | |
| 70 | #define IS_ARP(skb) \ |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 71 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 72 | |
Dave Jones | b6f99a2 | 2007-03-22 12:27:49 -0700 | [diff] [blame] | 73 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 74 | { |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 75 | if (skb_vlan_tag_present(skb)) |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 76 | return skb->protocol; |
| 77 | else if (skb->protocol == htons(ETH_P_8021Q)) |
| 78 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; |
| 79 | else |
| 80 | return 0; |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | #define IS_VLAN_IP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 84 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 85 | brnf_filter_vlan_tagged) |
| 86 | |
| 87 | #define IS_VLAN_IPV6(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 88 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 89 | brnf_filter_vlan_tagged) |
| 90 | |
| 91 | #define IS_VLAN_ARP(skb) \ |
Jesse Gross | 1393791 | 2010-10-20 13:56:01 +0000 | [diff] [blame] | 92 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 93 | brnf_filter_vlan_tagged) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 95 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
| 96 | { |
| 97 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + |
| 98 | sizeof(struct pppoe_hdr))); |
| 99 | } |
| 100 | |
| 101 | #define IS_PPPOE_IP(skb) \ |
| 102 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 103 | pppoe_proto(skb) == htons(PPP_IP) && \ |
| 104 | brnf_filter_pppoe_tagged) |
| 105 | |
| 106 | #define IS_PPPOE_IPV6(skb) \ |
| 107 | (skb->protocol == htons(ETH_P_PPP_SES) && \ |
| 108 | pppoe_proto(skb) == htons(PPP_IPV6) && \ |
| 109 | brnf_filter_pppoe_tagged) |
| 110 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 111 | /* largest possible L2 header, see br_nf_dev_queue_xmit() */ |
| 112 | #define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN) |
| 113 | |
| 114 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
| 115 | struct brnf_frag_data { |
| 116 | char mac[NF_BRIDGE_MAX_MAC_HEADER_LENGTH]; |
| 117 | u8 encap_size; |
| 118 | u8 size; |
| 119 | }; |
| 120 | |
| 121 | static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage); |
| 122 | #endif |
| 123 | |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 124 | static struct nf_bridge_info *nf_bridge_info_get(const struct sk_buff *skb) |
| 125 | { |
| 126 | return skb->nf_bridge; |
| 127 | } |
| 128 | |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 129 | static void nf_bridge_info_free(struct sk_buff *skb) |
| 130 | { |
| 131 | if (skb->nf_bridge) { |
| 132 | nf_bridge_put(skb->nf_bridge); |
| 133 | skb->nf_bridge = NULL; |
| 134 | } |
| 135 | } |
| 136 | |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 137 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
| 138 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 139 | struct net_bridge_port *port; |
| 140 | |
| 141 | port = br_port_get_rcu(dev); |
| 142 | return port ? &port->br->fake_rtable : NULL; |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 143 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 145 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
| 146 | { |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 147 | struct net_bridge_port *port; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 148 | |
stephen hemminger | b5ed54e | 2010-11-15 06:38:13 +0000 | [diff] [blame] | 149 | port = br_port_get_rcu(dev); |
| 150 | return port ? port->br->dev : NULL; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 151 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 153 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
| 154 | { |
| 155 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); |
| 156 | if (likely(skb->nf_bridge)) |
| 157 | atomic_set(&(skb->nf_bridge->use), 1); |
| 158 | |
| 159 | return skb->nf_bridge; |
| 160 | } |
| 161 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 162 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
| 163 | { |
| 164 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
| 165 | |
| 166 | if (atomic_read(&nf_bridge->use) > 1) { |
| 167 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); |
| 168 | |
| 169 | if (tmp) { |
| 170 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); |
| 171 | atomic_set(&tmp->use, 1); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 172 | } |
Changli Gao | 4c3a76a | 2010-08-22 19:03:26 +0000 | [diff] [blame] | 173 | nf_bridge_put(nf_bridge); |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 174 | nf_bridge = tmp; |
| 175 | } |
| 176 | return nf_bridge; |
| 177 | } |
| 178 | |
Florian Westphal | 8d04516 | 2015-03-18 20:55:31 +0100 | [diff] [blame] | 179 | static unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) |
| 180 | { |
| 181 | switch (skb->protocol) { |
| 182 | case __cpu_to_be16(ETH_P_8021Q): |
| 183 | return VLAN_HLEN; |
| 184 | case __cpu_to_be16(ETH_P_PPP_SES): |
| 185 | return PPPOE_SES_HLEN; |
| 186 | default: |
| 187 | return 0; |
| 188 | } |
| 189 | } |
| 190 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 191 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
| 192 | { |
| 193 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 194 | |
| 195 | skb_push(skb, len); |
| 196 | skb->network_header -= len; |
| 197 | } |
| 198 | |
| 199 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
| 200 | { |
| 201 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 202 | |
| 203 | skb_pull(skb, len); |
| 204 | skb->network_header += len; |
| 205 | } |
| 206 | |
| 207 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
| 208 | { |
| 209 | unsigned int len = nf_bridge_encap_header_len(skb); |
| 210 | |
| 211 | skb_pull_rcsum(skb, len); |
| 212 | skb->network_header += len; |
| 213 | } |
| 214 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 215 | /* When handing a packet over to the IP layer |
| 216 | * check whether we have a skb that is in the |
| 217 | * expected format |
| 218 | */ |
| 219 | |
Bernhard Thaler | 77d574e | 2015-05-30 15:29:02 +0200 | [diff] [blame] | 220 | static int br_validate_ipv4(struct sk_buff *skb) |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 221 | { |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 222 | const struct iphdr *iph; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 223 | struct net_device *dev = skb->dev; |
| 224 | u32 len; |
| 225 | |
Sarveshwar Bandi | 6caab7b | 2012-10-10 01:15:01 +0000 | [diff] [blame] | 226 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
| 227 | goto inhdr_error; |
| 228 | |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 229 | iph = ip_hdr(skb); |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 230 | |
| 231 | /* Basic sanity checks */ |
| 232 | if (iph->ihl < 5 || iph->version != 4) |
| 233 | goto inhdr_error; |
| 234 | |
| 235 | if (!pskb_may_pull(skb, iph->ihl*4)) |
| 236 | goto inhdr_error; |
| 237 | |
| 238 | iph = ip_hdr(skb); |
| 239 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
| 240 | goto inhdr_error; |
| 241 | |
| 242 | len = ntohs(iph->tot_len); |
| 243 | if (skb->len < len) { |
| 244 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); |
| 245 | goto drop; |
| 246 | } else if (len < (iph->ihl*4)) |
| 247 | goto inhdr_error; |
| 248 | |
| 249 | if (pskb_trim_rcsum(skb, len)) { |
| 250 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); |
| 251 | goto drop; |
| 252 | } |
| 253 | |
Eric Dumazet | f8e9881 | 2011-04-12 13:39:14 -0700 | [diff] [blame] | 254 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
Herbert Xu | 7677e86 | 2014-10-04 22:18:02 +0800 | [diff] [blame] | 255 | /* We should really parse IP options here but until |
| 256 | * somebody who actually uses IP options complains to |
| 257 | * us we'll just silently ignore the options because |
| 258 | * we're lazy! |
| 259 | */ |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 260 | return 0; |
| 261 | |
| 262 | inhdr_error: |
| 263 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); |
| 264 | drop: |
| 265 | return -1; |
| 266 | } |
| 267 | |
Bernhard Thaler | a4611d3 | 2015-05-30 15:29:38 +0200 | [diff] [blame] | 268 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff |
| 269 | * anyway |
| 270 | */ |
| 271 | static int check_hbh_len(struct sk_buff *skb) |
| 272 | { |
| 273 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
| 274 | u32 pkt_len; |
| 275 | const unsigned char *nh = skb_network_header(skb); |
| 276 | int off = raw - nh; |
| 277 | int len = (raw[1] + 1) << 3; |
| 278 | |
| 279 | if ((raw + len) - skb->data > skb_headlen(skb)) |
| 280 | goto bad; |
| 281 | |
| 282 | off += 2; |
| 283 | len -= 2; |
| 284 | |
| 285 | while (len > 0) { |
| 286 | int optlen = nh[off + 1] + 2; |
| 287 | |
| 288 | switch (nh[off]) { |
| 289 | case IPV6_TLV_PAD1: |
| 290 | optlen = 1; |
| 291 | break; |
| 292 | |
| 293 | case IPV6_TLV_PADN: |
| 294 | break; |
| 295 | |
| 296 | case IPV6_TLV_JUMBO: |
| 297 | if (nh[off + 1] != 4 || (off & 3) != 2) |
| 298 | goto bad; |
| 299 | pkt_len = ntohl(*(__be32 *)(nh + off + 2)); |
| 300 | if (pkt_len <= IPV6_MAXPLEN || |
| 301 | ipv6_hdr(skb)->payload_len) |
| 302 | goto bad; |
| 303 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
| 304 | goto bad; |
| 305 | if (pskb_trim_rcsum(skb, |
| 306 | pkt_len + sizeof(struct ipv6hdr))) |
| 307 | goto bad; |
| 308 | nh = skb_network_header(skb); |
| 309 | break; |
| 310 | default: |
| 311 | if (optlen > len) |
| 312 | goto bad; |
| 313 | break; |
| 314 | } |
| 315 | off += optlen; |
| 316 | len -= optlen; |
| 317 | } |
| 318 | if (len == 0) |
| 319 | return 0; |
| 320 | bad: |
| 321 | return -1; |
| 322 | } |
| 323 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 324 | /* Equivalent to br_validate_ipv4 for IPv6 */ |
| 325 | static int br_validate_ipv6(struct sk_buff *skb) |
| 326 | { |
| 327 | const struct ipv6hdr *hdr; |
| 328 | struct net_device *dev = skb->dev; |
| 329 | struct inet6_dev *idev = in6_dev_get(skb->dev); |
| 330 | u32 pkt_len; |
| 331 | u8 ip6h_len = sizeof(struct ipv6hdr); |
| 332 | |
| 333 | if (!pskb_may_pull(skb, ip6h_len)) |
| 334 | goto inhdr_error; |
| 335 | |
| 336 | if (skb->len < ip6h_len) |
| 337 | goto drop; |
| 338 | |
| 339 | hdr = ipv6_hdr(skb); |
| 340 | |
| 341 | if (hdr->version != 6) |
| 342 | goto inhdr_error; |
| 343 | |
| 344 | pkt_len = ntohs(hdr->payload_len); |
| 345 | |
| 346 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { |
| 347 | if (pkt_len + ip6h_len > skb->len) { |
| 348 | IP6_INC_STATS_BH(dev_net(dev), idev, |
| 349 | IPSTATS_MIB_INTRUNCATEDPKTS); |
| 350 | goto drop; |
| 351 | } |
| 352 | if (pskb_trim_rcsum(skb, pkt_len + ip6h_len)) { |
| 353 | IP6_INC_STATS_BH(dev_net(dev), idev, |
| 354 | IPSTATS_MIB_INDISCARDS); |
| 355 | goto drop; |
| 356 | } |
| 357 | } |
| 358 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) |
| 359 | goto drop; |
| 360 | |
| 361 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
| 362 | /* No IP options in IPv6 header; however it should be |
| 363 | * checked if some next headers need special treatment |
| 364 | */ |
| 365 | return 0; |
| 366 | |
| 367 | inhdr_error: |
| 368 | IP6_INC_STATS_BH(dev_net(dev), idev, IPSTATS_MIB_INHDRERRORS); |
| 369 | drop: |
| 370 | return -1; |
| 371 | } |
| 372 | |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 373 | static void nf_bridge_update_protocol(struct sk_buff *skb) |
| 374 | { |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 375 | switch (skb->nf_bridge->orig_proto) { |
| 376 | case BRNF_PROTO_8021Q: |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 377 | skb->protocol = htons(ETH_P_8021Q); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 378 | break; |
| 379 | case BRNF_PROTO_PPPOE: |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 380 | skb->protocol = htons(ETH_P_PPP_SES); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 381 | break; |
| 382 | case BRNF_PROTO_UNCHANGED: |
| 383 | break; |
| 384 | } |
Florian Westphal | 4a9d2f2 | 2015-03-05 00:52:34 +0100 | [diff] [blame] | 385 | } |
| 386 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 387 | /* Obtain the correct destination MAC address, while preserving the original |
| 388 | * source MAC address. If we already know this address, we just copy it. If we |
| 389 | * don't, we use the neighbour framework to find out. In both cases, we make |
| 390 | * sure that br_handle_frame_finish() is called afterwards. |
| 391 | */ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 392 | 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] | 393 | { |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 394 | struct neighbour *neigh; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 395 | struct dst_entry *dst; |
| 396 | |
| 397 | skb->dev = bridge_parent(skb->dev); |
| 398 | if (!skb->dev) |
| 399 | goto free_skb; |
| 400 | dst = skb_dst(skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 401 | neigh = dst_neigh_lookup_skb(dst, skb); |
| 402 | if (neigh) { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 403 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 404 | int ret; |
| 405 | |
| 406 | if (neigh->hh.hh_len) { |
| 407 | neigh_hh_bridge(&neigh->hh, skb); |
| 408 | skb->dev = nf_bridge->physindev; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 409 | ret = br_handle_frame_finish(sk, skb); |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 410 | } else { |
| 411 | /* the neighbour function below overwrites the complete |
| 412 | * MAC header, so we save the Ethernet source address and |
| 413 | * protocol number. |
| 414 | */ |
| 415 | skb_copy_from_linear_data_offset(skb, |
| 416 | -(ETH_HLEN-ETH_ALEN), |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 417 | nf_bridge->neigh_header, |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 418 | ETH_HLEN-ETH_ALEN); |
| 419 | /* tell br_dev_xmit to continue with forwarding */ |
| 420 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 421 | /* FIXME Need to refragment */ |
David S. Miller | f9d7516 | 2012-07-02 22:12:59 -0700 | [diff] [blame] | 422 | ret = neigh->output(neigh, skb); |
| 423 | } |
| 424 | neigh_release(neigh); |
| 425 | return ret; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 426 | } |
| 427 | free_skb: |
| 428 | kfree_skb(skb); |
| 429 | return 0; |
| 430 | } |
| 431 | |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 432 | static bool daddr_was_changed(const struct sk_buff *skb, |
| 433 | const struct nf_bridge_info *nf_bridge) |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 434 | { |
Bernhard Thaler | 72b31f7 | 2015-05-30 15:27:40 +0200 | [diff] [blame] | 435 | switch (skb->protocol) { |
| 436 | case htons(ETH_P_IP): |
| 437 | return ip_hdr(skb)->daddr != nf_bridge->ipv4_daddr; |
| 438 | case htons(ETH_P_IPV6): |
| 439 | return memcmp(&nf_bridge->ipv6_daddr, &ipv6_hdr(skb)->daddr, |
| 440 | sizeof(ipv6_hdr(skb)->daddr)) != 0; |
| 441 | default: |
| 442 | return false; |
| 443 | } |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 444 | } |
| 445 | |
Bernhard Thaler | 72b31f7 | 2015-05-30 15:27:40 +0200 | [diff] [blame] | 446 | /* PF_BRIDGE/PRE_ROUTING: Undo the changes made for ip6tables |
| 447 | * PREROUTING and continue the bridge PRE_ROUTING hook. See comment |
| 448 | * for br_nf_pre_routing_finish(), same logic is used here but |
| 449 | * equivalent IPv6 function ip6_route_input() called indirectly. |
Bernhard Thaler | 8cae308 | 2015-05-30 15:26:57 +0200 | [diff] [blame] | 450 | */ |
| 451 | static int br_nf_pre_routing_finish_ipv6(struct sock *sk, struct sk_buff *skb) |
| 452 | { |
| 453 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
| 454 | struct rtable *rt; |
Bernhard Thaler | 72b31f7 | 2015-05-30 15:27:40 +0200 | [diff] [blame] | 455 | struct net_device *dev = skb->dev; |
| 456 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); |
Bernhard Thaler | 8cae308 | 2015-05-30 15:26:57 +0200 | [diff] [blame] | 457 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 458 | nf_bridge->frag_max_size = IP6CB(skb)->frag_max_size; |
| 459 | |
Bernhard Thaler | 8cae308 | 2015-05-30 15:26:57 +0200 | [diff] [blame] | 460 | if (nf_bridge->pkt_otherhost) { |
| 461 | skb->pkt_type = PACKET_OTHERHOST; |
| 462 | nf_bridge->pkt_otherhost = false; |
| 463 | } |
| 464 | nf_bridge->mask &= ~BRNF_NF_BRIDGE_PREROUTING; |
Bernhard Thaler | 72b31f7 | 2015-05-30 15:27:40 +0200 | [diff] [blame] | 465 | if (daddr_was_changed(skb, nf_bridge)) { |
| 466 | skb_dst_drop(skb); |
| 467 | v6ops->route_input(skb); |
Bernhard Thaler | 8cae308 | 2015-05-30 15:26:57 +0200 | [diff] [blame] | 468 | |
Bernhard Thaler | 72b31f7 | 2015-05-30 15:27:40 +0200 | [diff] [blame] | 469 | if (skb_dst(skb)->error) { |
| 470 | kfree_skb(skb); |
| 471 | return 0; |
| 472 | } |
| 473 | |
| 474 | if (skb_dst(skb)->dev == dev) { |
| 475 | skb->dev = nf_bridge->physindev; |
| 476 | nf_bridge_update_protocol(skb); |
| 477 | nf_bridge_push_encap_header(skb); |
| 478 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, |
| 479 | sk, skb, skb->dev, NULL, |
| 480 | br_nf_pre_routing_finish_bridge, |
| 481 | 1); |
| 482 | return 0; |
| 483 | } |
| 484 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
| 485 | skb->pkt_type = PACKET_HOST; |
| 486 | } else { |
| 487 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 488 | if (!rt) { |
| 489 | kfree_skb(skb); |
| 490 | return 0; |
| 491 | } |
| 492 | skb_dst_set_noref(skb, &rt->dst); |
Bernhard Thaler | 8cae308 | 2015-05-30 15:26:57 +0200 | [diff] [blame] | 493 | } |
Bernhard Thaler | 8cae308 | 2015-05-30 15:26:57 +0200 | [diff] [blame] | 494 | |
| 495 | skb->dev = nf_bridge->physindev; |
| 496 | nf_bridge_update_protocol(skb); |
| 497 | nf_bridge_push_encap_header(skb); |
| 498 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, sk, skb, |
| 499 | skb->dev, NULL, |
| 500 | br_handle_frame_finish, 1); |
| 501 | |
| 502 | return 0; |
| 503 | } |
| 504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | /* This requires some explaining. If DNAT has taken place, |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 506 | * we will need to fix up the destination Ethernet address. |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 507 | * This is also true when SNAT takes place (for the reply direction). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | * |
| 509 | * There are two cases to consider: |
| 510 | * 1. The packet was DNAT'ed to a device in the same bridge |
| 511 | * port group as it was received on. We can still bridge |
| 512 | * the packet. |
| 513 | * 2. The packet was DNAT'ed to a different device, either |
| 514 | * a non-bridged device or another bridge port group. |
| 515 | * The packet will need to be routed. |
| 516 | * |
| 517 | * The correct way of distinguishing between these two cases is to |
| 518 | * call ip_route_input() and to look at skb->dst->dev, which is |
| 519 | * changed to the destination device if ip_route_input() succeeds. |
| 520 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 521 | * Let's first consider the case that ip_route_input() succeeds: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 523 | * If the output device equals the logical bridge device the packet |
| 524 | * came in on, we can consider this bridging. The corresponding MAC |
| 525 | * address will be obtained in br_nf_pre_routing_finish_bridge. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | * Otherwise, the packet is considered to be routed and we just |
| 527 | * change the destination MAC address so that the packet will |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 528 | * later be passed up to the IP stack to be routed. For a redirected |
| 529 | * packet, ip_route_input() will give back the localhost as output device, |
| 530 | * which differs from the bridge device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | * |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 532 | * Let's now consider the case that ip_route_input() fails: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | * |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 534 | * This can be because the destination address is martian, in which case |
| 535 | * the packet will be dropped. |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 536 | * If IP forwarding is disabled, ip_route_input() will fail, while |
| 537 | * ip_route_output_key() can return success. The source |
| 538 | * 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] | 539 | * 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] | 540 | * if IP forwarding is enabled. If the output device equals the logical bridge |
| 541 | * device, we proceed as if ip_route_input() succeeded. If it differs from the |
| 542 | * logical bridge port or if ip_route_output_key() fails we drop the packet. |
| 543 | */ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 544 | 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] | 545 | { |
| 546 | struct net_device *dev = skb->dev; |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 547 | struct iphdr *iph = ip_hdr(skb); |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 548 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 549 | struct rtable *rt; |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 550 | int err; |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 551 | |
Bernhard Thaler | 411ffb4 | 2015-05-30 15:28:28 +0200 | [diff] [blame] | 552 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 554 | if (nf_bridge->pkt_otherhost) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | skb->pkt_type = PACKET_OTHERHOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 556 | nf_bridge->pkt_otherhost = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
Bernhard Thaler | d39a33e | 2015-05-30 15:26:13 +0200 | [diff] [blame] | 558 | nf_bridge->mask &= ~BRNF_NF_BRIDGE_PREROUTING; |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 559 | if (daddr_was_changed(skb, nf_bridge)) { |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 560 | 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] | 561 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 562 | |
| 563 | /* If err equals -EHOSTUNREACH the error is due to a |
| 564 | * martian destination or due to the fact that |
| 565 | * forwarding is disabled. For most martian packets, |
| 566 | * ip_route_output_key() will fail. It won't fail for 2 types of |
| 567 | * martian destinations: loopback destinations and destination |
| 568 | * 0.0.0.0. In both cases the packet will be dropped because the |
| 569 | * destination is the loopback device and not the bridge. */ |
| 570 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) |
| 571 | goto free_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
David S. Miller | 78fbfd8 | 2011-03-12 00:00:52 -0500 | [diff] [blame] | 573 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
| 574 | RT_TOS(iph->tos), 0); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 575 | if (!IS_ERR(rt)) { |
Bart De Schuymer | 1c011be | 2005-09-14 20:55:16 -0700 | [diff] [blame] | 576 | /* - Bridged-and-DNAT'ed traffic doesn't |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 577 | * require ip_forwarding. */ |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 578 | if (rt->dst.dev == dev) { |
| 579 | skb_dst_set(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | goto bridged_dnat; |
| 581 | } |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 582 | ip_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | } |
Bart De Schuymer | f216f08 | 2006-12-05 13:45:21 -0800 | [diff] [blame] | 584 | free_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | kfree_skb(skb); |
| 586 | return 0; |
| 587 | } else { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 588 | if (skb_dst(skb)->dev == dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | bridged_dnat: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 591 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 592 | nf_bridge_push_encap_header(skb); |
Jan Engelhardt | 713aefa | 2010-03-23 04:07:21 +0100 | [diff] [blame] | 593 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
| 594 | NF_BR_PRE_ROUTING, |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 595 | sk, skb, skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | br_nf_pre_routing_finish_bridge, |
| 597 | 1); |
| 598 | return 0; |
| 599 | } |
Joe Perches | 0409114 | 2014-02-23 00:05:26 -0800 | [diff] [blame] | 600 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | skb->pkt_type = PACKET_HOST; |
| 602 | } |
| 603 | } else { |
Eric Dumazet | 511c3f9 | 2009-06-02 05:14:27 +0000 | [diff] [blame] | 604 | rt = bridge_parent_rtable(nf_bridge->physindev); |
| 605 | if (!rt) { |
Simon Wunderlich | 4adf0af | 2008-07-30 16:27:55 -0700 | [diff] [blame] | 606 | kfree_skb(skb); |
| 607 | return 0; |
| 608 | } |
Patrick McHardy | f9181f4 | 2010-06-15 17:31:06 +0200 | [diff] [blame] | 609 | skb_dst_set_noref(skb, &rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | } |
| 611 | |
| 612 | skb->dev = nf_bridge->physindev; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 613 | nf_bridge_update_protocol(skb); |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 614 | nf_bridge_push_encap_header(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 615 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, sk, skb, |
| 616 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | br_handle_frame_finish, 1); |
| 618 | |
| 619 | return 0; |
| 620 | } |
| 621 | |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 622 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
| 623 | { |
| 624 | struct net_device *vlan, *br; |
| 625 | |
| 626 | br = bridge_parent(dev); |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 627 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 628 | return br; |
| 629 | |
dingtianhong | f06c7f9 | 2014-05-09 14:58:05 +0800 | [diff] [blame] | 630 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
Jiri Pirko | df8a39d | 2015-01-13 17:13:44 +0100 | [diff] [blame] | 631 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 632 | |
| 633 | return vlan ? vlan : br; |
| 634 | } |
| 635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | /* Some common code for IPv4/IPv6 */ |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 637 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 639 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
| 641 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 642 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 643 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; |
| 647 | nf_bridge->physindev = skb->dev; |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 648 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 649 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 650 | if (skb->protocol == htons(ETH_P_8021Q)) |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 651 | nf_bridge->orig_proto = BRNF_PROTO_8021Q; |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 652 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
Florian Westphal | 3eaf402 | 2015-04-02 14:31:44 +0200 | [diff] [blame] | 653 | nf_bridge->orig_proto = BRNF_PROTO_PPPOE; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 654 | |
Florian Westphal | 6b8dbcf | 2013-10-24 21:32:42 +0200 | [diff] [blame] | 655 | /* Must drop socket now because of tproxy. */ |
| 656 | skb_orphan(skb); |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 657 | return skb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | } |
| 659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | /* Replicate the checks that IPv6 does on packet reception and pass the packet |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 661 | * to ip6tables. |
| 662 | */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 663 | 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] | 664 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 665 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
Bernhard Thaler | 72b31f7 | 2015-05-30 15:27:40 +0200 | [diff] [blame] | 667 | struct nf_bridge_info *nf_bridge; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 669 | if (br_validate_ipv6(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 670 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 672 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 673 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 675 | if (!setup_pre_routing(skb)) |
| 676 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
Bernhard Thaler | 72b31f7 | 2015-05-30 15:27:40 +0200 | [diff] [blame] | 678 | nf_bridge = nf_bridge_info_get(skb); |
| 679 | nf_bridge->ipv6_daddr = ipv6_hdr(skb)->daddr; |
| 680 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 681 | skb->protocol = htons(ETH_P_IPV6); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 682 | NF_HOOK(NFPROTO_IPV6, 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_ipv6); |
| 685 | |
| 686 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
| 690 | * Replicate the checks that IPv4 does on packet reception. |
| 691 | * Set skb->dev to the bridge device (i.e. parent of the |
| 692 | * receiving device) to make netfilter happy, the REDIRECT |
| 693 | * target in particular. Save the original destination IP |
| 694 | * address to be able to detect DNAT afterwards. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 695 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
| 696 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 697 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | { |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 699 | struct nf_bridge_info *nf_bridge; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 700 | struct net_bridge_port *p; |
| 701 | struct net_bridge *br; |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 702 | __u32 len = nf_bridge_encap_header_len(skb); |
| 703 | |
Evgeniy Polyakov | e7c243c | 2007-08-24 23:36:29 -0700 | [diff] [blame] | 704 | if (unlikely(!pskb_may_pull(skb, len))) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 705 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 707 | p = br_port_get_rcu(state->in); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 708 | if (p == NULL) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 709 | return NF_DROP; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 710 | br = p->br; |
| 711 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 712 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 713 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 715 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 716 | nf_bridge_pull_encap_header_rcsum(skb); |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 717 | return br_nf_pre_routing_ipv6(ops, skb, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | } |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 719 | |
| 720 | if (!brnf_call_iptables && !br->nf_call_iptables) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 723 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return NF_ACCEPT; |
| 725 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 726 | nf_bridge_pull_encap_header_rcsum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | |
Bernhard Thaler | 77d574e | 2015-05-30 15:29:02 +0200 | [diff] [blame] | 728 | if (br_validate_ipv4(skb)) |
Herbert Xu | deef4b5 | 2010-12-09 17:38:11 +0000 | [diff] [blame] | 729 | return NF_DROP; |
Herbert Xu | 1776206 | 2010-07-05 21:29:28 +0000 | [diff] [blame] | 730 | |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 731 | nf_bridge_put(skb->nf_bridge); |
Stephen Hemminger | fdeabde | 2006-03-20 22:58:21 -0800 | [diff] [blame] | 732 | if (!nf_bridge_alloc(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | return NF_DROP; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 734 | if (!setup_pre_routing(skb)) |
| 735 | return NF_DROP; |
Florian Westphal | c055d5b | 2015-03-10 05:08:19 +0100 | [diff] [blame] | 736 | |
Florian Westphal | faecbb4 | 2015-05-20 13:42:25 +0200 | [diff] [blame] | 737 | nf_bridge = nf_bridge_info_get(skb); |
| 738 | nf_bridge->ipv4_daddr = ip_hdr(skb)->daddr; |
| 739 | |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 740 | skb->protocol = htons(ETH_P_IP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 742 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->sk, skb, |
| 743 | skb->dev, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | br_nf_pre_routing_finish); |
| 745 | |
| 746 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | } |
| 748 | |
| 749 | |
| 750 | /* PF_BRIDGE/LOCAL_IN ************************************************/ |
| 751 | /* The packet is locally destined, which requires a real |
| 752 | * dst_entry, so detach the fake one. On the way up, the |
| 753 | * packet would pass through PRE_ROUTING again (which already |
| 754 | * took place when the packet entered the bridge), but we |
| 755 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will |
| 756 | * prevent this from happening. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 757 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
| 758 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 759 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | { |
Peter Huang (Peng) | a881e96 | 2012-04-19 20:12:51 +0000 | [diff] [blame] | 761 | br_drop_fake_rtable(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | return NF_ACCEPT; |
| 763 | } |
| 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | /* PF_BRIDGE/FORWARD *************************************************/ |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 766 | 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] | 767 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 768 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | struct net_device *in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 771 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 772 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 773 | if (skb->protocol == htons(ETH_P_IP)) |
Bernhard Thaler | 411ffb4 | 2015-05-30 15:28:28 +0200 | [diff] [blame] | 774 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 775 | |
| 776 | if (skb->protocol == htons(ETH_P_IPV6)) |
| 777 | nf_bridge->frag_max_size = IP6CB(skb)->frag_max_size; |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | in = nf_bridge->physindev; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 780 | if (nf_bridge->pkt_otherhost) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | skb->pkt_type = PACKET_OTHERHOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 782 | nf_bridge->pkt_otherhost = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | } |
Bart De Schuymer | e94c674 | 2010-05-13 14:55:34 +0200 | [diff] [blame] | 784 | nf_bridge_update_protocol(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } else { |
| 786 | in = *((struct net_device **)(skb->cb)); |
| 787 | } |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 788 | nf_bridge_push_encap_header(skb); |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 789 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 790 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, sk, skb, |
| 791 | in, skb->dev, br_forward_finish, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | return 0; |
| 793 | } |
| 794 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 795 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
| 797 | * netfilter with indev and outdev set to the bridge device, |
| 798 | * but we are still able to filter on the 'real' indev/outdev |
| 799 | * because of the physdev module. For ARP, indev and outdev are the |
| 800 | * bridge ports. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 801 | static unsigned int br_nf_forward_ip(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 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | struct nf_bridge_info *nf_bridge; |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 806 | struct net_device *parent; |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 807 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
| 809 | if (!skb->nf_bridge) |
| 810 | return NF_ACCEPT; |
| 811 | |
Patrick McHardy | 2dc2f20 | 2008-01-20 06:25:48 -0800 | [diff] [blame] | 812 | /* Need exclusive nf_bridge_info since we might have multiple |
| 813 | * different physoutdevs. */ |
| 814 | if (!nf_bridge_unshare(skb)) |
| 815 | return NF_DROP; |
| 816 | |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 817 | nf_bridge = nf_bridge_info_get(skb); |
| 818 | if (!nf_bridge) |
| 819 | return NF_DROP; |
| 820 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 821 | parent = bridge_parent(state->out); |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 822 | if (!parent) |
| 823 | return NF_DROP; |
| 824 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 825 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 826 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 827 | 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] | 828 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 829 | else |
| 830 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 832 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 835 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 836 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } |
| 838 | |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 839 | if (pf == NFPROTO_IPV4) { |
Bernhard Thaler | 77d574e | 2015-05-30 15:29:02 +0200 | [diff] [blame] | 840 | if (br_validate_ipv4(skb)) |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 841 | return NF_DROP; |
Bernhard Thaler | 411ffb4 | 2015-05-30 15:28:28 +0200 | [diff] [blame] | 842 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; |
Florian Westphal | 0b67c43 | 2015-04-01 22:36:27 +0200 | [diff] [blame] | 843 | } |
Herbert Xu | 6b1e960 | 2011-03-18 05:27:28 +0000 | [diff] [blame] | 844 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 845 | if (pf == NFPROTO_IPV6) { |
| 846 | if (br_validate_ipv6(skb)) |
| 847 | return NF_DROP; |
| 848 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; |
| 849 | } |
| 850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | nf_bridge->physoutdev = skb->dev; |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 852 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 853 | skb->protocol = htons(ETH_P_IP); |
| 854 | else |
| 855 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 857 | NF_HOOK(pf, NF_INET_FORWARD, NULL, skb, |
| 858 | brnf_get_logical_dev(skb, state->in), |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 859 | parent, br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
| 861 | return NF_STOLEN; |
| 862 | } |
| 863 | |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 864 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
| 865 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 866 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | { |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 868 | struct net_bridge_port *p; |
| 869 | struct net_bridge *br; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | struct net_device **d = (struct net_device **)(skb->cb); |
| 871 | |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 872 | p = br_port_get_rcu(state->out); |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 873 | if (p == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | return NF_ACCEPT; |
Patrick McHardy | 4df53d8 | 2010-07-02 09:32:57 +0200 | [diff] [blame] | 875 | br = p->br; |
| 876 | |
| 877 | if (!brnf_call_arptables && !br->nf_call_arptables) |
| 878 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 880 | if (!IS_ARP(skb)) { |
Stephen Hemminger | 8b42ec3 | 2006-03-20 22:58:05 -0800 | [diff] [blame] | 881 | if (!IS_VLAN_ARP(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | return NF_ACCEPT; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 883 | nf_bridge_pull_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } |
| 885 | |
Arnaldo Carvalho de Melo | d0a92be | 2007-03-12 20:56:31 -0300 | [diff] [blame] | 886 | if (arp_hdr(skb)->ar_pln != 4) { |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 887 | if (IS_VLAN_ARP(skb)) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 888 | nf_bridge_push_encap_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | return NF_ACCEPT; |
| 890 | } |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 891 | *d = state->in; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 892 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, state->sk, skb, |
| 893 | state->in, state->out, br_nf_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | |
| 895 | return NF_STOLEN; |
| 896 | } |
| 897 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 898 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) || IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 899 | 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] | 900 | { |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 901 | struct brnf_frag_data *data; |
| 902 | int err; |
| 903 | |
| 904 | data = this_cpu_ptr(&brnf_frag_data_storage); |
| 905 | err = skb_cow_head(skb, data->size); |
| 906 | |
| 907 | if (err) { |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame] | 908 | kfree_skb(skb); |
| 909 | return 0; |
| 910 | } |
| 911 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 912 | skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size); |
| 913 | __skb_push(skb, data->encap_size); |
| 914 | |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 915 | nf_bridge_info_free(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 916 | return br_dev_queue_push_xmit(sk, skb); |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame] | 917 | } |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 918 | #endif |
Florian Westphal | 8bd63cf | 2015-03-05 00:52:33 +0100 | [diff] [blame] | 919 | |
Andy Zhou | 49d16b2 | 2015-05-15 14:15:37 -0700 | [diff] [blame] | 920 | static int br_nf_ip_fragment(struct sock *sk, struct sk_buff *skb, |
| 921 | int (*output)(struct sock *, struct sk_buff *)) |
| 922 | { |
| 923 | unsigned int mtu = ip_skb_dst_mtu(skb); |
| 924 | struct iphdr *iph = ip_hdr(skb); |
| 925 | struct rtable *rt = skb_rtable(skb); |
| 926 | struct net_device *dev = rt->dst.dev; |
| 927 | |
| 928 | if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || |
| 929 | (IPCB(skb)->frag_max_size && |
| 930 | IPCB(skb)->frag_max_size > mtu))) { |
| 931 | IP_INC_STATS(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
| 932 | kfree_skb(skb); |
| 933 | return -EMSGSIZE; |
| 934 | } |
| 935 | |
| 936 | return ip_do_fragment(sk, skb, output); |
| 937 | } |
| 938 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 939 | 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] | 940 | { |
Bernhard Thaler | 411ffb4 | 2015-05-30 15:28:28 +0200 | [diff] [blame] | 941 | struct nf_bridge_info *nf_bridge; |
Florian Westphal | 7a8d831 | 2015-03-05 00:52:36 +0100 | [diff] [blame] | 942 | unsigned int mtu_reserved; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 943 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 944 | mtu_reserved = nf_bridge_mtu_reduction(skb); |
| 945 | |
| 946 | if (skb_is_gso(skb) || skb->len + mtu_reserved <= skb->dev->mtu) { |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 947 | nf_bridge_info_free(skb); |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 948 | return br_dev_queue_push_xmit(sk, skb); |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 949 | } |
Florian Westphal | 7a8d831 | 2015-03-05 00:52:36 +0100 | [diff] [blame] | 950 | |
Bernhard Thaler | 411ffb4 | 2015-05-30 15:28:28 +0200 | [diff] [blame] | 951 | nf_bridge = nf_bridge_info_get(skb); |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 952 | |
| 953 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
Herbert Xu | 93fdd47 | 2014-10-05 12:00:22 +0800 | [diff] [blame] | 954 | /* This is wrong! We should preserve the original fragment |
| 955 | * boundaries by preserving frag_list rather than refragmenting. |
| 956 | */ |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 957 | if (skb->protocol == htons(ETH_P_IP)) { |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 958 | struct brnf_frag_data *data; |
| 959 | |
Bernhard Thaler | 77d574e | 2015-05-30 15:29:02 +0200 | [diff] [blame] | 960 | if (br_validate_ipv4(skb)) |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 961 | return NF_DROP; |
Bernhard Thaler | 411ffb4 | 2015-05-30 15:28:28 +0200 | [diff] [blame] | 962 | |
| 963 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 964 | |
| 965 | nf_bridge_update_protocol(skb); |
| 966 | |
| 967 | data = this_cpu_ptr(&brnf_frag_data_storage); |
| 968 | data->encap_size = nf_bridge_encap_header_len(skb); |
| 969 | data->size = ETH_HLEN + data->encap_size; |
| 970 | |
| 971 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, |
| 972 | data->size); |
| 973 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 974 | return br_nf_ip_fragment(sk, skb, br_nf_push_frag_xmit); |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 975 | } |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 976 | #endif |
| 977 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
| 978 | if (skb->protocol == htons(ETH_P_IPV6)) { |
| 979 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); |
| 980 | struct brnf_frag_data *data; |
Bandan Das | 462fb2a | 2010-09-19 09:34:33 +0000 | [diff] [blame] | 981 | |
Bernhard Thaler | efb6de9 | 2015-05-30 15:30:16 +0200 | [diff] [blame^] | 982 | if (br_validate_ipv6(skb)) |
| 983 | return NF_DROP; |
| 984 | |
| 985 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; |
| 986 | |
| 987 | nf_bridge_update_protocol(skb); |
| 988 | |
| 989 | data = this_cpu_ptr(&brnf_frag_data_storage); |
| 990 | data->encap_size = nf_bridge_encap_header_len(skb); |
| 991 | data->size = ETH_HLEN + data->encap_size; |
| 992 | |
| 993 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, |
| 994 | data->size); |
| 995 | |
| 996 | if (v6ops) |
| 997 | return v6ops->fragment(sk, skb, br_nf_push_frag_xmit); |
| 998 | else |
| 999 | return -EMSGSIZE; |
| 1000 | } |
| 1001 | #endif |
Florian Westphal | a9fcc6a | 2015-05-03 22:06:07 +0200 | [diff] [blame] | 1002 | nf_bridge_info_free(skb); |
| 1003 | return br_dev_queue_push_xmit(sk, skb); |
hummerbliss@gmail.com | c197fac | 2009-04-20 17:12:35 +0200 | [diff] [blame] | 1004 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
| 1006 | /* PF_BRIDGE/POST_ROUTING ********************************************/ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 1007 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
| 1008 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 1009 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 1011 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | struct net_device *realoutdev = bridge_parent(skb->dev); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 1013 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Florian Westphal | e4bb9bc | 2015-03-10 10:36:48 +0100 | [diff] [blame] | 1015 | /* if nf_bridge is set, but ->physoutdev is NULL, this packet came in |
| 1016 | * on a bridge, but was delivered locally and is now being routed: |
| 1017 | * |
| 1018 | * POST_ROUTING was already invoked from the ip stack. |
| 1019 | */ |
| 1020 | if (!nf_bridge || !nf_bridge->physoutdev) |
Patrick McHardy | 81d9dda | 2007-11-13 02:58:44 -0800 | [diff] [blame] | 1021 | return NF_ACCEPT; |
| 1022 | |
Stephen Hemminger | 5dce971 | 2006-02-09 17:09:38 -0800 | [diff] [blame] | 1023 | if (!realoutdev) |
| 1024 | return NF_DROP; |
| 1025 | |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 1026 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1027 | pf = NFPROTO_IPV4; |
Florian Westphal | 739e450 | 2012-03-06 01:22:54 +0000 | [diff] [blame] | 1028 | 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] | 1029 | pf = NFPROTO_IPV6; |
Herbert Xu | a2bd40a | 2009-01-12 00:06:02 +0000 | [diff] [blame] | 1030 | else |
| 1031 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
| 1034 | * about the value of skb->pkt_type. */ |
| 1035 | if (skb->pkt_type == PACKET_OTHERHOST) { |
| 1036 | skb->pkt_type = PACKET_HOST; |
Florian Westphal | a1e6795 | 2015-04-02 14:31:45 +0200 | [diff] [blame] | 1037 | nf_bridge->pkt_otherhost = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | } |
| 1039 | |
Patrick McHardy | fc38582 | 2007-05-03 03:36:16 -0700 | [diff] [blame] | 1040 | nf_bridge_pull_encap_header(skb); |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1041 | if (pf == NFPROTO_IPV4) |
Bart De Schuymer | e179e63 | 2010-04-15 12:26:39 +0200 | [diff] [blame] | 1042 | skb->protocol = htons(ETH_P_IP); |
| 1043 | else |
| 1044 | skb->protocol = htons(ETH_P_IPV6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 1046 | NF_HOOK(pf, NF_INET_POST_ROUTING, state->sk, skb, |
| 1047 | NULL, realoutdev, |
Patrick McHardy | 2e2f7ae | 2006-04-04 13:42:35 -0700 | [diff] [blame] | 1048 | br_nf_dev_queue_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | |
| 1050 | return NF_STOLEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | } |
| 1052 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | /* IP/SABOTAGE *****************************************************/ |
| 1054 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING |
| 1055 | * for the second time. */ |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 1056 | static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops, |
| 1057 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 1058 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 1060 | if (skb->nf_bridge && |
| 1061 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | return NF_STOP; |
| 1063 | } |
| 1064 | |
| 1065 | return NF_ACCEPT; |
| 1066 | } |
| 1067 | |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1068 | /* This is called when br_netfilter has called into iptables/netfilter, |
| 1069 | * and DNAT has taken place on a bridge-forwarded packet. |
| 1070 | * |
| 1071 | * neigh->output has created a new MAC header, with local br0 MAC |
| 1072 | * as saddr. |
| 1073 | * |
| 1074 | * This restores the original MAC saddr of the bridged packet |
| 1075 | * before invoking bridge forward logic to transmit the packet. |
| 1076 | */ |
| 1077 | static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) |
| 1078 | { |
Florian Westphal | 3833078 | 2015-04-02 14:31:43 +0200 | [diff] [blame] | 1079 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1080 | |
| 1081 | skb_pull(skb, ETH_HLEN); |
| 1082 | nf_bridge->mask &= ~BRNF_BRIDGED_DNAT; |
| 1083 | |
Florian Westphal | e70deec | 2015-04-02 14:31:40 +0200 | [diff] [blame] | 1084 | BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN)); |
| 1085 | |
| 1086 | skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN), |
| 1087 | nf_bridge->neigh_header, |
| 1088 | ETH_HLEN - ETH_ALEN); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1089 | skb->dev = nf_bridge->physindev; |
Florian Westphal | 7fb48c5 | 2015-05-03 22:05:28 +0200 | [diff] [blame] | 1090 | |
| 1091 | nf_bridge->physoutdev = NULL; |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 1092 | br_handle_frame_finish(NULL, skb); |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1093 | } |
| 1094 | |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1095 | static int br_nf_dev_xmit(struct sk_buff *skb) |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1096 | { |
| 1097 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { |
| 1098 | br_nf_pre_routing_finish_bridge_slow(skb); |
| 1099 | return 1; |
| 1100 | } |
| 1101 | return 0; |
| 1102 | } |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1103 | |
| 1104 | static const struct nf_br_ops br_ops = { |
| 1105 | .br_dev_xmit_hook = br_nf_dev_xmit, |
| 1106 | }; |
Pablo Neira Ayuso | e5de75b | 2015-03-09 12:30:12 +0100 | [diff] [blame] | 1107 | |
Pablo Neira Ayuso | 4b7fd5d | 2014-10-02 11:13:21 +0200 | [diff] [blame] | 1108 | void br_netfilter_enable(void) |
| 1109 | { |
| 1110 | } |
| 1111 | EXPORT_SYMBOL_GPL(br_netfilter_enable); |
| 1112 | |
Bart De Schuymer | ea2d9b4 | 2010-04-15 12:14:51 +0200 | [diff] [blame] | 1113 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
| 1114 | * br_dev_queue_push_xmit is called afterwards */ |
Patrick McHardy | 1999414 | 2007-12-05 01:23:00 -0800 | [diff] [blame] | 1115 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1116 | { |
| 1117 | .hook = br_nf_pre_routing, |
| 1118 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1119 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1120 | .hooknum = NF_BR_PRE_ROUTING, |
| 1121 | .priority = NF_BR_PRI_BRNF, |
| 1122 | }, |
| 1123 | { |
| 1124 | .hook = br_nf_local_in, |
| 1125 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1126 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1127 | .hooknum = NF_BR_LOCAL_IN, |
| 1128 | .priority = NF_BR_PRI_BRNF, |
| 1129 | }, |
| 1130 | { |
| 1131 | .hook = br_nf_forward_ip, |
| 1132 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1133 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1134 | .hooknum = NF_BR_FORWARD, |
| 1135 | .priority = NF_BR_PRI_BRNF - 1, |
| 1136 | }, |
| 1137 | { |
| 1138 | .hook = br_nf_forward_arp, |
| 1139 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1140 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1141 | .hooknum = NF_BR_FORWARD, |
| 1142 | .priority = NF_BR_PRI_BRNF, |
| 1143 | }, |
| 1144 | { |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1145 | .hook = br_nf_post_routing, |
| 1146 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1147 | .pf = NFPROTO_BRIDGE, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1148 | .hooknum = NF_BR_POST_ROUTING, |
| 1149 | .priority = NF_BR_PRI_LAST, |
| 1150 | }, |
| 1151 | { |
| 1152 | .hook = ip_sabotage_in, |
| 1153 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1154 | .pf = NFPROTO_IPV4, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1155 | .hooknum = NF_INET_PRE_ROUTING, |
| 1156 | .priority = NF_IP_PRI_FIRST, |
| 1157 | }, |
| 1158 | { |
| 1159 | .hook = ip_sabotage_in, |
| 1160 | .owner = THIS_MODULE, |
Alban Crequy | aa740f4 | 2012-05-14 03:56:36 +0000 | [diff] [blame] | 1161 | .pf = NFPROTO_IPV6, |
Cyrill Gorcunov | 1490fd8 | 2009-07-03 20:11:57 +0000 | [diff] [blame] | 1162 | .hooknum = NF_INET_PRE_ROUTING, |
| 1163 | .priority = NF_IP6_PRI_FIRST, |
| 1164 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | }; |
| 1166 | |
| 1167 | #ifdef CONFIG_SYSCTL |
| 1168 | static |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 1169 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
tanxiaojun | 56b148e | 2013-12-19 13:28:13 +0800 | [diff] [blame] | 1170 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | { |
| 1172 | int ret; |
| 1173 | |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 1174 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | |
| 1176 | if (write && *(int *)(ctl->data)) |
| 1177 | *(int *)(ctl->data) = 1; |
| 1178 | return ret; |
| 1179 | } |
| 1180 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 1181 | static struct ctl_table brnf_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | .procname = "bridge-nf-call-arptables", |
| 1184 | .data = &brnf_call_arptables, |
| 1185 | .maxlen = sizeof(int), |
| 1186 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1187 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | }, |
| 1189 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | .procname = "bridge-nf-call-iptables", |
| 1191 | .data = &brnf_call_iptables, |
| 1192 | .maxlen = sizeof(int), |
| 1193 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1194 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | }, |
| 1196 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | .procname = "bridge-nf-call-ip6tables", |
| 1198 | .data = &brnf_call_ip6tables, |
| 1199 | .maxlen = sizeof(int), |
| 1200 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1201 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | }, |
| 1203 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | .procname = "bridge-nf-filter-vlan-tagged", |
| 1205 | .data = &brnf_filter_vlan_tagged, |
| 1206 | .maxlen = sizeof(int), |
| 1207 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1208 | .proc_handler = brnf_sysctl_call_tables, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | }, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1210 | { |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1211 | .procname = "bridge-nf-filter-pppoe-tagged", |
| 1212 | .data = &brnf_filter_pppoe_tagged, |
| 1213 | .maxlen = sizeof(int), |
| 1214 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 1215 | .proc_handler = brnf_sysctl_call_tables, |
Michael Milner | 516299d | 2007-04-12 22:14:23 -0700 | [diff] [blame] | 1216 | }, |
Pablo Neira Ayuso | 4981682 | 2012-05-08 19:36:44 +0200 | [diff] [blame] | 1217 | { |
| 1218 | .procname = "bridge-nf-pass-vlan-input-dev", |
| 1219 | .data = &brnf_pass_vlan_indev, |
| 1220 | .maxlen = sizeof(int), |
| 1221 | .mode = 0644, |
| 1222 | .proc_handler = brnf_sysctl_call_tables, |
| 1223 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 1224 | { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | #endif |
| 1227 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1228 | static int __init br_netfilter_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | { |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1230 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1232 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1233 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | return ret; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 1235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | ec8f23c | 2012-04-19 13:44:49 +0000 | [diff] [blame] | 1237 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | if (brnf_sysctl_header == NULL) { |
Stephen Hemminger | 789bc3e | 2006-03-20 22:57:32 -0800 | [diff] [blame] | 1239 | printk(KERN_WARNING |
| 1240 | "br_netfilter: can't register to sysctl.\n"); |
Geert Uytterhoeven | 9672723 | 2015-02-12 15:17:27 +0100 | [diff] [blame] | 1241 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
| 1242 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | } |
| 1244 | #endif |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1245 | RCU_INIT_POINTER(nf_br_ops, &br_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | return 0; |
| 1248 | } |
| 1249 | |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1250 | static void __exit br_netfilter_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | { |
Pablo Neira Ayuso | 1a4ba64 | 2015-03-10 10:27:18 +0100 | [diff] [blame] | 1252 | RCU_INIT_POINTER(nf_br_ops, NULL); |
Patrick McHardy | 5eb87f4 | 2007-02-07 15:07:22 -0800 | [diff] [blame] | 1253 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | #ifdef CONFIG_SYSCTL |
Eric W. Biederman | 5dd3df1 | 2012-04-19 13:24:33 +0000 | [diff] [blame] | 1255 | unregister_net_sysctl_table(brnf_sysctl_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | } |
Pablo Neira Ayuso | 34666d4 | 2014-09-18 11:29:03 +0200 | [diff] [blame] | 1258 | |
| 1259 | module_init(br_netfilter_init); |
| 1260 | module_exit(br_netfilter_fini); |
| 1261 | |
| 1262 | MODULE_LICENSE("GPL"); |
| 1263 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); |
| 1264 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); |
| 1265 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |