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authorThomas Graf <tgraf@suug.ch>2006-08-10 21:17:37 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-09-22 14:53:48 -0700
commitda5e0494c542dddc56a1f1edfd30310ea30f41ff (patch)
tree7b1a0d32607fa184f6b5a807cd877e9fe31a2bef
parent1823730fbc89fadde72a7bb3b7bdf03cc7b8835c (diff)
[NET]: Convert link modification to new netlink api
Transforms do_setlink() into rtnl_setlink() using the new netlink api. A warning message printed to the console is added in the event that a change request fails while part of the change request has been comitted already. The ioctl() based nature of net devices makes it almost impossible to move on to atomic netlink operations without obsoleting some of the functionality. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/rtnetlink.c191
1 files changed, 100 insertions, 91 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 35712031e2c..2adc966d981 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -336,52 +336,69 @@ static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *c
return skb->len;
}
-static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = {
+ [IFLA_IFNAME] = { .type = NLA_STRING },
+ [IFLA_MAP] = { .minlen = sizeof(struct rtnl_link_ifmap) },
+ [IFLA_MTU] = { .type = NLA_U32 },
+ [IFLA_TXQLEN] = { .type = NLA_U32 },
+ [IFLA_WEIGHT] = { .type = NLA_U32 },
+ [IFLA_OPERSTATE] = { .type = NLA_U8 },
+ [IFLA_LINKMODE] = { .type = NLA_U8 },
+};
+
+static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
- struct ifinfomsg *ifm = NLMSG_DATA(nlh);
- struct rtattr **ida = arg;
+ struct ifinfomsg *ifm;
struct net_device *dev;
- int err, send_addr_notify = 0;
+ int err, send_addr_notify = 0, modified = 0;
+ struct nlattr *tb[IFLA_MAX+1];
+ char ifname[IFNAMSIZ];
+ err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
+ if (err < 0)
+ goto errout;
+
+ if (tb[IFLA_IFNAME] &&
+ nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ)
+ return -EINVAL;
+
+ err = -EINVAL;
+ ifm = nlmsg_data(nlh);
if (ifm->ifi_index >= 0)
dev = dev_get_by_index(ifm->ifi_index);
- else if (ida[IFLA_IFNAME - 1]) {
- char ifname[IFNAMSIZ];
-
- if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
- IFNAMSIZ) >= IFNAMSIZ)
- return -EINVAL;
+ else if (tb[IFLA_IFNAME])
dev = dev_get_by_name(ifname);
- } else
- return -EINVAL;
+ else
+ goto errout;
- if (!dev)
- return -ENODEV;
+ if (dev == NULL) {
+ err = -ENODEV;
+ goto errout;
+ }
- err = -EINVAL;
+ if (tb[IFLA_ADDRESS] &&
+ nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
+ goto errout_dev;
- if (ifm->ifi_flags)
- dev_change_flags(dev, ifm->ifi_flags);
+ if (tb[IFLA_BROADCAST] &&
+ nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
+ goto errout_dev;
- if (ida[IFLA_MAP - 1]) {
+ if (tb[IFLA_MAP]) {
struct rtnl_link_ifmap *u_map;
struct ifmap k_map;
if (!dev->set_config) {
err = -EOPNOTSUPP;
- goto out;
+ goto errout_dev;
}
if (!netif_device_present(dev)) {
err = -ENODEV;
- goto out;
+ goto errout_dev;
}
-
- if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map)))
- goto out;
-
- u_map = RTA_DATA(ida[IFLA_MAP - 1]);
+ u_map = nla_data(tb[IFLA_MAP]);
k_map.mem_start = (unsigned long) u_map->mem_start;
k_map.mem_end = (unsigned long) u_map->mem_end;
k_map.base_addr = (unsigned short) u_map->base_addr;
@@ -390,119 +407,111 @@ static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
k_map.port = (unsigned char) u_map->port;
err = dev->set_config(dev, &k_map);
+ if (err < 0)
+ goto errout_dev;
- if (err)
- goto out;
+ modified = 1;
}
- if (ida[IFLA_ADDRESS - 1]) {
+ if (tb[IFLA_ADDRESS]) {
struct sockaddr *sa;
int len;
if (!dev->set_mac_address) {
err = -EOPNOTSUPP;
- goto out;
+ goto errout_dev;
}
+
if (!netif_device_present(dev)) {
err = -ENODEV;
- goto out;
+ goto errout_dev;
}
- if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
- goto out;
len = sizeof(sa_family_t) + dev->addr_len;
sa = kmalloc(len, GFP_KERNEL);
if (!sa) {
err = -ENOMEM;
- goto out;
+ goto errout_dev;
}
sa->sa_family = dev->type;
- memcpy(sa->sa_data, RTA_DATA(ida[IFLA_ADDRESS - 1]),
+ memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
dev->addr_len);
err = dev->set_mac_address(dev, sa);
kfree(sa);
if (err)
- goto out;
+ goto errout_dev;
send_addr_notify = 1;
+ modified = 1;
}
- 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);
- send_addr_notify = 1;
+ if (tb[IFLA_MTU]) {
+ err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
+ if (err < 0)
+ goto errout_dev;
+ modified = 1;
}
- if (ida[IFLA_MTU - 1]) {
- if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
- goto out;
- err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1])));
-
- if (err)
- goto out;
-
+ /*
+ * Interface selected by interface index but interface
+ * name provided implies that a name change has been
+ * requested.
+ */
+ if (ifm->ifi_index >= 0 && ifname[0]) {
+ err = dev_change_name(dev, ifname);
+ if (err < 0)
+ goto errout_dev;
+ modified = 1;
}
- if (ida[IFLA_TXQLEN - 1]) {
- if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
- goto out;
+#ifdef CONFIG_NET_WIRELESS_RTNETLINK
+ if (tb[IFLA_WIRELESS]) {
+ /* Call Wireless Extensions.
+ * Various stuff checked in there... */
+ err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]),
+ nla_len(tb[IFLA_WIRELESS]));
+ if (err < 0)
+ goto errout_dev;
+ }
+#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
- dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1]));
+ if (tb[IFLA_BROADCAST]) {
+ nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
+ send_addr_notify = 1;
}
- if (ida[IFLA_WEIGHT - 1]) {
- if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32)))
- goto out;
- dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1]));
- }
+ if (ifm->ifi_flags)
+ dev_change_flags(dev, ifm->ifi_flags);
- if (ida[IFLA_OPERSTATE - 1]) {
- if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
- goto out;
+ if (tb[IFLA_TXQLEN])
+ dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
- set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1])));
- }
+ if (tb[IFLA_WEIGHT])
+ dev->weight = nla_get_u32(tb[IFLA_WEIGHT]);
- if (ida[IFLA_LINKMODE - 1]) {
- if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8)))
- goto out;
+ if (tb[IFLA_OPERSTATE])
+ set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
+ if (tb[IFLA_LINKMODE]) {
write_lock_bh(&dev_base_lock);
- dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1]));
+ dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
write_unlock_bh(&dev_base_lock);
}
- if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) {
- char ifname[IFNAMSIZ];
-
- if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1],
- IFNAMSIZ) >= IFNAMSIZ)
- goto out;
- err = dev_change_name(dev, ifname);
- if (err)
- goto out;
- }
-
-#ifdef CONFIG_NET_WIRELESS_RTNETLINK
- if (ida[IFLA_WIRELESS - 1]) {
-
- /* Call Wireless Extensions.
- * Various stuff checked in there... */
- err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len);
- if (err)
- goto out;
- }
-#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
-
err = 0;
-out:
+errout_dev:
+ if (err < 0 && modified && net_ratelimit())
+ printk(KERN_WARNING "A link change request failed with "
+ "some changes comitted already. Interface %s may "
+ "have been left with an inconsistent configuration, "
+ "please check.\n", dev->name);
+
if (send_addr_notify)
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
dev_put(dev);
+errout:
return err;
}
@@ -753,7 +762,7 @@ static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] =
.doit = do_getlink,
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
.dumpit = rtnetlink_dump_ifinfo },
- [RTM_SETLINK - RTM_BASE] = { .doit = do_setlink },
+ [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink },
[RTM_GETADDR - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
[RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all },
[RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add },