diff options
| -rw-r--r-- | net/wireless/wext.c | 114 |
1 files changed, 57 insertions, 57 deletions
diff --git a/net/wireless/wext.c b/net/wireless/wext.c index db8351a5a87d..ee35e6422f1f 100644 --- a/net/wireless/wext.c +++ b/net/wireless/wext.c @@ -1300,22 +1300,15 @@ static void wireless_nlevent_process(struct work_struct *work) static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process); -/* ---------------------------------------------------------------- */ -/* - * Fill a rtnetlink message with our event data. - * Note that we propage only the specified event and don't dump the - * current wireless config. Dumping the wireless config is far too - * expensive (for each parameter, the driver need to query the hardware). - */ -static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev, - int type, char *event, int event_len) +static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev, + struct sk_buff *skb) { struct ifinfomsg *r; struct nlmsghdr *nlh; - nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0); - if (nlh == NULL) - return -EMSGSIZE; + nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0); + if (!nlh) + return NULL; r = nlmsg_data(nlh); r->ifi_family = AF_UNSPEC; @@ -1326,45 +1319,14 @@ static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev, r->ifi_change = 0; /* Wireless changes don't affect those flags */ NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); - /* Add the wireless events in the netlink packet */ - NLA_PUT(skb, IFLA_WIRELESS, event_len, event); - - return nlmsg_end(skb, nlh); -nla_put_failure: + return nlh; + nla_put_failure: nlmsg_cancel(skb, nlh); - return -EMSGSIZE; + return NULL; } -/* ---------------------------------------------------------------- */ -/* - * Create and broadcast and send it on the standard rtnetlink socket - * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c - * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field - * within a RTM_NEWLINK event. - */ -static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len) -{ - struct sk_buff *skb; - int err; - - skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); - if (!skb) - return; - err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len); - if (err < 0) { - WARN_ON(err == -EMSGSIZE); - kfree_skb(skb); - return; - } - - NETLINK_CB(skb).dst_group = RTNLGRP_LINK; - skb_queue_tail(&dev_net(dev)->wext_nlevents, skb); - schedule_work(&wireless_nlevent_work); -} - -/* ---------------------------------------------------------------- */ /* * Main event dispatcher. Called from other parts and drivers. * Send the event on the appropriate channels. @@ -1383,6 +1345,9 @@ void wireless_send_event(struct net_device * dev, int wrqu_off = 0; /* Offset in wrqu */ /* Don't "optimise" the following variable, it will crash */ unsigned cmd_index; /* *MUST* be unsigned */ + struct sk_buff *skb; + struct nlmsghdr *nlh; + struct nlattr *nla; /* Get the description of the Event */ if (cmd <= SIOCIWLAST) { @@ -1430,25 +1395,60 @@ void wireless_send_event(struct net_device * dev, hdr_len = event_type_size[descr->header_type]; event_len = hdr_len + extra_len; - /* Create temporary buffer to hold the event */ - event = kmalloc(event_len, GFP_ATOMIC); - if (event == NULL) + /* + * The problem for 64/32 bit. + * + * On 64-bit, a regular event is laid out as follows: + * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | + * | event.len | event.cmd | p a d d i n g | + * | wrqu data ... (with the correct size) | + * + * This padding exists because we manipulate event->u, + * and 'event' is not packed. + * + * An iw_point event is laid out like this instead: + * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | + * | event.len | event.cmd | p a d d i n g | + * | iwpnt.len | iwpnt.flg | p a d d i n g | + * | extra data ... + * + * The second padding exists because struct iw_point is extended, + * but this depends on the platform... + * + * On 32-bit, all the padding shouldn't be there. + */ + + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); + if (!skb) + return; + + /* Send via the RtNetlink event channel */ + nlh = rtnetlink_ifinfo_prep(dev, skb); + if (WARN_ON(!nlh)) { + kfree_skb(skb); + return; + } + + /* Add the wireless events in the netlink packet */ + nla = nla_reserve(skb, IFLA_WIRELESS, event_len); + if (!nla) { + kfree_skb(skb); return; + } + event = nla_data(nla); - /* Fill event */ + /* Fill event - first clear to avoid data leaking */ + memset(event, 0, hdr_len); event->len = event_len; event->cmd = cmd; memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN); - if (extra) + if (extra_len) memcpy(((char *) event) + hdr_len, extra, extra_len); - /* Send via the RtNetlink event channel */ - rtmsg_iwinfo(dev, (char *) event, event_len); - - /* Cleanup */ - kfree(event); + nlmsg_end(skb, nlh); - return; /* Always success, I guess ;-) */ + skb_queue_tail(&dev_net(dev)->wext_nlevents, skb); + schedule_work(&wireless_nlevent_work); } EXPORT_SYMBOL(wireless_send_event); |