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Diffstat (limited to 'net/bridge/br_netlink.c')
-rw-r--r--net/bridge/br_netlink.c113
1 files changed, 53 insertions, 60 deletions
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 8f661195d09d..a9139682c49b 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -15,6 +15,18 @@
#include <net/netlink.h>
#include "br_private.h"
+static inline size_t br_nlmsg_size(void)
+{
+ return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ + nla_total_size(4) /* IFLA_MASTER */
+ + nla_total_size(4) /* IFLA_MTU */
+ + nla_total_size(4) /* IFLA_LINK */
+ + nla_total_size(1) /* IFLA_OPERSTATE */
+ + nla_total_size(1); /* IFLA_PROTINFO */
+}
+
/*
* Create one netlink message for one interface
* Contains port and master info as well as carrier and bridge state.
@@ -24,51 +36,43 @@ static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *por
{
const struct net_bridge *br = port->br;
const struct net_device *dev = port->dev;
- struct ifinfomsg *r;
+ struct ifinfomsg *hdr;
struct nlmsghdr *nlh;
- unsigned char *b = skb->tail;
- u32 mtu = dev->mtu;
u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
- u8 portstate = port->state;
pr_debug("br_fill_info event %d port %s master %s\n",
event, dev->name, br->dev->name);
- nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
- r = NLMSG_DATA(nlh);
- r->ifi_family = AF_BRIDGE;
- r->__ifi_pad = 0;
- r->ifi_type = dev->type;
- r->ifi_index = dev->ifindex;
- r->ifi_flags = dev_get_flags(dev);
- r->ifi_change = 0;
+ nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
+ if (nlh == NULL)
+ return -ENOBUFS;
- RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
+ hdr = nlmsg_data(nlh);
+ hdr->ifi_family = AF_BRIDGE;
+ hdr->__ifi_pad = 0;
+ hdr->ifi_type = dev->type;
+ hdr->ifi_index = dev->ifindex;
+ hdr->ifi_flags = dev_get_flags(dev);
+ hdr->ifi_change = 0;
- RTA_PUT(skb, IFLA_MASTER, sizeof(int), &br->dev->ifindex);
+ NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
+ NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex);
+ NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
+ NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate);
if (dev->addr_len)
- RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
+ NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
- RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
if (dev->ifindex != dev->iflink)
- RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
-
-
- RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
+ NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
if (event == RTM_NEWLINK)
- RTA_PUT(skb, IFLA_PROTINFO, sizeof(portstate), &portstate);
-
- nlh->nlmsg_len = skb->tail - b;
-
- return skb->len;
+ NLA_PUT_U8(skb, IFLA_PROTINFO, port->state);
-nlmsg_failure:
-rtattr_failure:
+ return nlmsg_end(skb, nlh);
- skb_trim(skb, b - skb->data);
- return -EINVAL;
+nla_put_failure:
+ return nlmsg_cancel(skb, nlh);
}
/*
@@ -77,19 +81,16 @@ rtattr_failure:
void br_ifinfo_notify(int event, struct net_bridge_port *port)
{
struct sk_buff *skb;
- int payload = sizeof(struct ifinfomsg) + 128;
int err = -ENOBUFS;
pr_debug("bridge notify event=%d\n", event);
- skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
+ skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
- if (err < 0) {
- kfree_skb(skb);
- goto errout;
- }
+ /* failure implies BUG in br_nlmsg_size() */
+ BUG_ON(err < 0);
err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
errout:
@@ -104,25 +105,18 @@ static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net_device *dev;
int idx;
- int s_idx = cb->args[0];
- int err = 0;
read_lock(&dev_base_lock);
for (dev = dev_base, idx = 0; dev; dev = dev->next) {
- struct net_bridge_port *p = dev->br_port;
-
/* not a bridge port */
- if (!p)
- continue;
-
- if (idx < s_idx)
- goto cont;
+ if (dev->br_port == NULL || idx < cb->args[0])
+ goto skip;
- err = br_fill_ifinfo(skb, p, NETLINK_CB(cb->skb).pid,
- cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
- if (err <= 0)
+ if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, RTM_NEWLINK,
+ NLM_F_MULTI) < 0)
break;
-cont:
+skip:
++idx;
}
read_unlock(&dev_base_lock);
@@ -138,26 +132,27 @@ cont:
*/
static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
- struct rtattr **rta = arg;
- struct ifinfomsg *ifm = NLMSG_DATA(nlh);
+ struct ifinfomsg *ifm;
+ struct nlattr *protinfo;
struct net_device *dev;
struct net_bridge_port *p;
u8 new_state;
+ if (nlmsg_len(nlh) < sizeof(*ifm))
+ return -EINVAL;
+
+ ifm = nlmsg_data(nlh);
if (ifm->ifi_family != AF_BRIDGE)
return -EPFNOSUPPORT;
- /* Must pass valid state as PROTINFO */
- if (rta[IFLA_PROTINFO-1]) {
- u8 *pstate = RTA_DATA(rta[IFLA_PROTINFO-1]);
- new_state = *pstate;
- } else
+ protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
+ if (!protinfo || nla_len(protinfo) < sizeof(u8))
return -EINVAL;
+ new_state = nla_get_u8(protinfo);
if (new_state > BR_STATE_BLOCKING)
return -EINVAL;
- /* Find bridge port */
dev = __dev_get_by_index(ifm->ifi_index);
if (!dev)
return -ENODEV;
@@ -170,10 +165,8 @@ static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
if (p->br->stp_enabled)
return -EBUSY;
- if (!netif_running(dev))
- return -ENETDOWN;
-
- if (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)
+ if (!netif_running(dev) ||
+ (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED))
return -ENETDOWN;
p->state = new_state;
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-25 11:36:53 +0300