target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch

   1 --- a/net/bridge/br_multicast.c
   2 +++ b/net/bridge/br_multicast.c
   3 @@ -635,7 +635,8 @@ struct net_bridge_port_group *br_multica
   4                         struct net_bridge_port *port,
   5                         struct br_ip *group,
   6                         struct net_bridge_port_group __rcu *next,
   7 -                       unsigned char state)
   8 +                       unsigned char state,
   9 +                       const unsigned char *src)
  10  {
  11         struct net_bridge_port_group *p;
  12
  13 @@ -650,12 +651,33 @@ struct net_bridge_port_group *br_multica
  14         hlist_add_head(&p->mglist, &port->mglist);
  15         setup_timer(&p->timer, br_multicast_port_group_expired,
  16                     (unsigned long)p);
  17 +       if ((port->flags & BR_MULTICAST_TO_UCAST) && src) {
  18 +               memcpy(p->eth_addr, src, ETH_ALEN);
  19 +               p->unicast = true;
  20 +       }
  21         return p;
  22  }
  23
  24 +static bool br_port_group_equal(struct net_bridge_port_group *p,
  25 +                               struct net_bridge_port *port,
  26 +                               const unsigned char *src)
  27 +{
  28 +       if (p->port != port)
  29 +               return false;
  30 +
  31 +       if (!p->unicast)
  32 +               return true;
  33 +
  34 +       if (!src)
  35 +               return false;
  36 +
  37 +       return ether_addr_equal(src, p->eth_addr);
  38 +}
  39 +
  40  static int br_multicast_add_group(struct net_bridge *br,
  41                                   struct net_bridge_port *port,
  42 -                                 struct br_ip *group)
  43 +                                 struct br_ip *group,
  44 +                                 const unsigned char *src)
  45  {
  46         struct net_bridge_mdb_entry *mp;
  47         struct net_bridge_port_group *p;
  48 @@ -682,13 +704,13 @@ static int br_multicast_add_group(struct
  49         for (pp = &mp->ports;
  50              (p = mlock_dereference(*pp, br)) != NULL;
  51              pp = &p->next) {
  52 -               if (p->port == port)
  53 +               if (br_port_group_equal(p, port, src))
  54                         goto found;
  55                 if ((unsigned long)p->port < (unsigned long)port)
  56                         break;
  57         }
  58
  59 -       p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
  60 +       p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY, src);
  61         if (unlikely(!p))
  62                 goto err;
  63         rcu_assign_pointer(*pp, p);
  64 @@ -707,7 +729,7 @@ err:
  65  static int br_ip4_multicast_add_group(struct net_bridge *br,
  66                                       struct net_bridge_port *port,
  67                                       __be32 group,
  68 -                                     __u16 vid)
  69 +                                     __u16 vid, const unsigned char *src)
  70  {
  71         struct br_ip br_group;
  72
  73 @@ -718,14 +740,14 @@ static int br_ip4_multicast_add_group(st
  74         br_group.proto = htons(ETH_P_IP);
  75         br_group.vid = vid;
  76
  77 -       return br_multicast_add_group(br, port, &br_group);
  78 +       return br_multicast_add_group(br, port, &br_group, src);
  79  }
  80
  81  #if IS_ENABLED(CONFIG_IPV6)
  82  static int br_ip6_multicast_add_group(struct net_bridge *br,
  83                                       struct net_bridge_port *port,
  84                                       const struct in6_addr *group,
  85 -                                     __u16 vid)
  86 +                                     __u16 vid, const unsigned char *src)
  87  {
  88         struct br_ip br_group;
  89
  90 @@ -736,7 +758,7 @@ static int br_ip6_multicast_add_group(st
  91         br_group.proto = htons(ETH_P_IPV6);
  92         br_group.vid = vid;
  93
  94 -       return br_multicast_add_group(br, port, &br_group);
  95 +       return br_multicast_add_group(br, port, &br_group, src);
  96  }
  97  #endif
  98
  99 @@ -965,6 +987,7 @@ static int br_ip4_multicast_igmp3_report
 100                                          struct sk_buff *skb,
 101                                          u16 vid)
 102  {
 103 +       const unsigned char *src;
 104         struct igmpv3_report *ih;
 105         struct igmpv3_grec *grec;
 106         int i;
 107 @@ -1008,7 +1031,8 @@ static int br_ip4_multicast_igmp3_report
 108                         continue;
 109                 }
 110
 111 -               err = br_ip4_multicast_add_group(br, port, group, vid);
 112 +               src = eth_hdr(skb)->h_source;
 113 +               err = br_ip4_multicast_add_group(br, port, group, vid, src);
 114                 if (err)
 115                         break;
 116         }
 117 @@ -1022,6 +1046,7 @@ static int br_ip6_multicast_mld2_report(
 118                                         struct sk_buff *skb,
 119                                         u16 vid)
 120  {
 121 +       const unsigned char *src;
 122         struct icmp6hdr *icmp6h;
 123         struct mld2_grec *grec;
 124         int i;
 125 @@ -1069,8 +1094,9 @@ static int br_ip6_multicast_mld2_report(
 126                         continue;
 127                 }
 128
 129 +               src = eth_hdr(skb)->h_source;
 130                 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
 131 -                                                vid);
 132 +                                                vid, src);
 133                 if (err)
 134                         break;
 135         }
 136 @@ -1406,7 +1432,8 @@ br_multicast_leave_group(struct net_brid
 137                          struct net_bridge_port *port,
 138                          struct br_ip *group,
 139                          struct bridge_mcast_other_query *other_query,
 140 -                        struct bridge_mcast_own_query *own_query)
 141 +                        struct bridge_mcast_own_query *own_query,
 142 +                        const unsigned char *src)
 143  {
 144         struct net_bridge_mdb_htable *mdb;
 145         struct net_bridge_mdb_entry *mp;
 146 @@ -1456,7 +1483,7 @@ br_multicast_leave_group(struct net_brid
 147                 for (pp = &mp->ports;
 148                      (p = mlock_dereference(*pp, br)) != NULL;
 149                      pp = &p->next) {
 150 -                       if (p->port != port)
 151 +                       if (!br_port_group_equal(p, port, src))
 152                                 continue;
 153
 154                         rcu_assign_pointer(*pp, p->next);
 155 @@ -1490,7 +1517,7 @@ br_multicast_leave_group(struct net_brid
 156         for (p = mlock_dereference(mp->ports, br);
 157              p != NULL;
 158              p = mlock_dereference(p->next, br)) {
 159 -               if (p->port != port)
 160 +               if (!br_port_group_equal(p, port, src))
 161                         continue;
 162
 163                 if (!hlist_unhashed(&p->mglist) &&
 164 @@ -1508,8 +1535,8 @@ out:
 165
 166  static void br_ip4_multicast_leave_group(struct net_bridge *br,
 167                                          struct net_bridge_port *port,
 168 -                                        __be32 group,
 169 -                                        __u16 vid)
 170 +                                        __be32 group, __u16 vid,
 171 +                                        const unsigned char *src)
 172  {
 173         struct br_ip br_group;
 174         struct bridge_mcast_own_query *own_query;
 175 @@ -1524,14 +1551,14 @@ static void br_ip4_multicast_leave_group
 176         br_group.vid = vid;
 177
 178         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
 179 -                                own_query);
 180 +                                own_query, src);
 181  }
 182
 183  #if IS_ENABLED(CONFIG_IPV6)
 184  static void br_ip6_multicast_leave_group(struct net_bridge *br,
 185                                          struct net_bridge_port *port,
 186                                          const struct in6_addr *group,
 187 -                                        __u16 vid)
 188 +                                        __u16 vid, const unsigned char *src)
 189  {
 190         struct br_ip br_group;
 191         struct bridge_mcast_own_query *own_query;
 192 @@ -1546,7 +1573,7 @@ static void br_ip6_multicast_leave_group
 193         br_group.vid = vid;
 194
 195         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
 196 -                                own_query);
 197 +                                own_query, src);
 198  }
 199  #endif
 200
 201 @@ -1555,6 +1582,7 @@ static int br_multicast_ipv4_rcv(struct
 202                                  struct sk_buff *skb,
 203                                  u16 vid)
 204  {
 205 +       const unsigned char *src;
 206         struct sk_buff *skb2 = skb;
 207         const struct iphdr *iph;
 208         struct igmphdr *ih;
 209 @@ -1628,7 +1656,8 @@ static int br_multicast_ipv4_rcv(struct
 210         case IGMP_HOST_MEMBERSHIP_REPORT:
 211         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 212                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
 213 -               err = br_ip4_multicast_add_group(br, port, ih->group, vid);
 214 +               src = eth_hdr(skb)->h_source;
 215 +               err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
 216                 break;
 217         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 218                 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
 219 @@ -1637,7 +1666,8 @@ static int br_multicast_ipv4_rcv(struct
 220                 err = br_ip4_multicast_query(br, port, skb2, vid);
 221                 break;
 222         case IGMP_HOST_LEAVE_MESSAGE:
 223 -               br_ip4_multicast_leave_group(br, port, ih->group, vid);
 224 +               src = eth_hdr(skb)->h_source;
 225 +               br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
 226                 break;
 227         }
 228
 229 @@ -1655,6 +1685,7 @@ static int br_multicast_ipv6_rcv(struct
 230                                  struct sk_buff *skb,
 231                                  u16 vid)
 232  {
 233 +       const unsigned char *src;
 234         struct sk_buff *skb2;
 235         const struct ipv6hdr *ip6h;
 236         u8 icmp6_type;
 237 @@ -1764,7 +1795,9 @@ static int br_multicast_ipv6_rcv(struct
 238                 }
 239                 mld = (struct mld_msg *)skb_transport_header(skb2);
 240                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
 241 -               err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
 242 +               src = eth_hdr(skb)->h_source;
 243 +               err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
 244 +                                                src);
 245                 break;
 246             }
 247         case ICMPV6_MLD2_REPORT:
 248 @@ -1781,7 +1814,8 @@ static int br_multicast_ipv6_rcv(struct
 249                         goto out;
 250                 }
 251                 mld = (struct mld_msg *)skb_transport_header(skb2);
 252 -               br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
 253 +               src = eth_hdr(skb)->h_source;
 254 +               br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
 255             }
 256         }
 257
 258 --- a/net/bridge/br_private.h
 259 +++ b/net/bridge/br_private.h
 260 @@ -112,6 +112,9 @@ struct net_bridge_port_group {
 261         struct timer_list               timer;
 262         struct br_ip                    addr;
 263         unsigned char                   state;
 264 +
 265 +       unsigned char                   eth_addr[ETH_ALEN];
 266 +       bool                            unicast;
 267  };
 268
 269  struct net_bridge_mdb_entry
 270 @@ -173,6 +176,7 @@ struct net_bridge_port
 271  #define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
 272  #define BR_PROMISC             0x00000080
 273  #define BR_ISOLATE_MODE                0x00000100
 274 +#define BR_MULTICAST_TO_UCAST  0x00000200
 275
 276  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 277         struct bridge_mcast_own_query   ip4_own_query;
 278 @@ -485,7 +489,8 @@ void br_multicast_free_pg(struct rcu_hea
 279  struct net_bridge_port_group *
 280  br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 281                             struct net_bridge_port_group __rcu *next,
 282 -                           unsigned char state);
 283 +                           unsigned char state,
 284 +                      const unsigned char *src);
 285  void br_mdb_init(void);
 286  void br_mdb_uninit(void);
 287  void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 288 --- a/net/bridge/br_mdb.c
 289 +++ b/net/bridge/br_mdb.c
 290 @@ -342,7 +342,7 @@ static int br_mdb_add_group(struct net_b
 291                         break;
 292         }
 293
 294 -       p = br_multicast_new_port_group(port, group, *pp, state);
 295 +       p = br_multicast_new_port_group(port, group, *pp, state, NULL);
 296         if (unlikely(!p))
 297                 return -ENOMEM;
 298         rcu_assign_pointer(*pp, p);
 299 --- a/net/bridge/br_forward.c
 300 +++ b/net/bridge/br_forward.c
 301 @@ -168,6 +168,34 @@ out:
 302         return p;
 303  }
 304
 305 +static struct net_bridge_port *maybe_deliver_addr(
 306 +       struct net_bridge_port *prev, struct net_bridge_port *p,
 307 +       struct sk_buff *skb, const unsigned char *addr,
 308 +       void (*__packet_hook)(const struct net_bridge_port *p,
 309 +                             struct sk_buff *skb))
 310 +{
 311 +       struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
 312 +       const unsigned char *src = eth_hdr(skb)->h_source;
 313 +
 314 +       if (!should_deliver(p, skb))
 315 +               return prev;
 316 +
 317 +       /* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
 318 +       if (skb->dev == p->dev && ether_addr_equal(src, addr))
 319 +               return prev;
 320 +
 321 +       skb = skb_copy(skb, GFP_ATOMIC);
 322 +       if (!skb) {
 323 +               dev->stats.tx_dropped++;
 324 +               return prev;
 325 +       }
 326 +
 327 +       memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
 328 +       __packet_hook(p, skb);
 329 +
 330 +       return prev;
 331 +}
 332 +
 333  /* called under bridge lock */
 334  static void br_flood(struct net_bridge *br, struct sk_buff *skb,
 335                      struct sk_buff *skb0,
 336 @@ -232,6 +260,7 @@ static void br_multicast_flood(struct ne
 337         struct net_bridge_port *prev = NULL;
 338         struct net_bridge_port_group *p;
 339         struct hlist_node *rp;
 340 +       const unsigned char *addr;
 341
 342         rp = rcu_dereference(hlist_first_rcu(&br->router_list));
 343         p = mdst ? rcu_dereference(mdst->ports) : NULL;
 344 @@ -242,10 +271,19 @@ static void br_multicast_flood(struct ne
 345                 rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
 346                              NULL;
 347
 348 -               port = (unsigned long)lport > (unsigned long)rport ?
 349 -                      lport : rport;
 350 -
 351 -               prev = maybe_deliver(prev, port, skb, __packet_hook);
 352 +               if ((unsigned long)lport > (unsigned long)rport) {
 353 +                       port = lport;
 354 +                       addr = p->unicast ? p->eth_addr : NULL;
 355 +               } else {
 356 +                       port = rport;
 357 +                       addr = NULL;
 358 +               }
 359 +
 360 +               if (addr)
 361 +                       prev = maybe_deliver_addr(prev, port, skb, addr,
 362 +                                                 __packet_hook);
 363 +               else
 364 +                       prev = maybe_deliver(prev, port, skb, __packet_hook);
 365                 if (IS_ERR(prev))
 366                         goto out;
 367
 368 --- a/net/bridge/br_sysfs_if.c
 369 +++ b/net/bridge/br_sysfs_if.c
 370 @@ -202,6 +202,7 @@ static BRPORT_ATTR(multicast_router, S_I
 371                    store_multicast_router);
 372
 373  BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
 374 +BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UCAST);
 375  #endif
 376
 377  static const struct brport_attribute *brport_attrs[] = {
 378 @@ -228,6 +229,7 @@ static const struct brport_attribute *br
 379  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 380         &brport_attr_multicast_router,
 381         &brport_attr_multicast_fast_leave,
 382 +       &brport_attr_multicast_to_unicast,
 383  #endif
 384         &brport_attr_isolate_mode,
 385         NULL