[NET]: Increase MAX_ADDR_LEN.

- Add ARPHRD_INFINIBAND
- Increase MAX_ADDR_LEN to 32 from 8
- Add suitable length protection to SIOCGIFHWADDR and friends.
- Add RTM_SETLINK for portably setting larger hw addrs.

include/linux/if_arp.h

@@ -40,6 +40,7 @@
 #define ARPHRD_METRICOM	23		/* Metricom STRIP (new IANA id)	*/
 #define	ARPHRD_IEEE1394	24		/* IEEE 1394 IPv4 - RFC 2734	*/
 #define ARPHRD_EUI64	27		/* EUI-64                       */
+#define ARPHRD_INFINIBAND 32		/* InfiniBand			*/
 
 /* Dummy types for non ARP hardware */
 #define ARPHRD_SLIP	256

include/linux/netdevice.h

@@ -65,7 +65,7 @@ struct vlan_group;
 
 #endif
 
-#define MAX_ADDR_LEN	8		/* Largest hardware address length */
+#define MAX_ADDR_LEN	32		/* Largest hardware address length */
 
 /*
  *	Compute the worst case header length according to the protocols

include/linux/rtnetlink.h

@@ -17,6 +17,7 @@
 #define	RTM_NEWLINK	(RTM_BASE+0)
 #define	RTM_DELLINK	(RTM_BASE+1)
 #define	RTM_GETLINK	(RTM_BASE+2)
+#define	RTM_SETLINK	(RTM_BASE+3)
 
 #define	RTM_NEWADDR	(RTM_BASE+4)
 #define	RTM_DELADDR	(RTM_BASE+5)

net/core/dev.c

@@ -2131,7 +2131,7 @@ static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
 
 		case SIOCGIFHWADDR:
 			memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
-			       MAX_ADDR_LEN);
+			       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
 			ifr->ifr_hwaddr.sa_family = dev->type;
 			return 0;
 
@@ -2152,7 +2152,7 @@ static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
 			if (ifr->ifr_hwaddr.sa_family != dev->type)
 				return -EINVAL;
 			memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
-			       MAX_ADDR_LEN);
+			       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
 			notifier_call_chain(&netdev_chain,
 					    NETDEV_CHANGEADDR, dev);
 			return 0;

net/core/rtnetlink.c

@@ -220,6 +220,40 @@ int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 	return skb->len;
 }
 
+static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+	struct ifinfomsg  *ifm = NLMSG_DATA(nlh);
+	struct rtattr    **ida = arg;
+	struct net_device *dev;
+	int err;
+
+	dev = dev_get_by_index(ifm->ifi_index);
+	if (!dev)
+		return -ENODEV;
+
+	err = -EINVAL;
+
+	if (ida[IFLA_ADDRESS - 1]) {
+		if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
+			goto out;
+		memcpy(dev->dev_addr, RTA_DATA(ida[IFLA_ADDRESS - 1]),
+		       dev->addr_len);
+	}
+
+	if (ida[IFLA_BROADCAST - 1]) {
+		if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len))
+			goto out;
+		memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]),
+		       dev->addr_len);
+	}
+
+	err = 0;
+
+out:
+	dev_put(dev);
+	return err;
+}
+
 int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	int idx;
@@ -457,33 +491,15 @@ static void rtnetlink_rcv(struct sock *sk, int len)
 
 static struct rtnetlink_link link_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
 {
-	{ NULL,			NULL,			},
-	{ NULL,			NULL,			},
-	{ NULL,			rtnetlink_dump_ifinfo,	},
-	{ NULL,			NULL,			},
-
-	{ NULL,			NULL,			},
-	{ NULL,			NULL,			},
-	{ NULL,			rtnetlink_dump_all,	},
-	{ NULL,			NULL,			},
-
-	{ NULL,			NULL,			},
-	{ NULL,			NULL,			},
-	{ NULL,			rtnetlink_dump_all,	},
-	{ NULL,			NULL,			},
-
-	{ neigh_add,		NULL,			},
-	{ neigh_delete,		NULL,			},
-	{ NULL,			neigh_dump_info,	},
-	{ NULL,			NULL,			},
-
-	{ NULL,			NULL,			},
-	{ NULL,			NULL,			},
-	{ NULL,			NULL,			},
-	{ NULL,			NULL,			},
+	[RTM_GETLINK  - RTM_BASE] = { .dumpit = rtnetlink_dump_ifinfo },
+	[RTM_SETLINK  - RTM_BASE] = { .doit   = do_setlink	      },
+	[RTM_GETADDR  - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
+	[RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all    },
+	[RTM_NEWNEIGH - RTM_BASE] = { .doit   = neigh_add	      },
+	[RTM_DELNEIGH - RTM_BASE] = { .doit   = neigh_delete	      },
+	[RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info	      }
 };
 
-
 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
 {
 	struct net_device *dev = ptr;