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rtnetlink: Compute and store minimum ifinfo dump size

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The message size allocated for rtnl ifinfo dumps was limited to
a single page.  This is not enough for additional interface info
available with devices that support SR-IOV and caused a bug in
which VF info would not be displayed if more than approximately
40 VFs were created per interface.

Implement a new function pointer for the rtnl_register service that will
calculate the amount of data required for the ifinfo dump and allocate
enough data to satisfy the request.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Greg Rose 2011-06-10 01:27:09 +00:00 committed by Jeff Kirsher
parent 929dd04772
commit c7ac8679be
30 changed files with 158 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/infiniband/core/netlink.c
View File

@ -148,7 +148,7 @@ static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
return -EINVAL;
return netlink_dump_start(nls, skb, nlh,
client->cb_table[op].dump,
NULL);
NULL, 0);
}
}

6
include/linux/netlink.h
View File

@ -221,7 +221,8 @@ struct netlink_callback {
int (*dump)(struct sk_buff * skb,
struct netlink_callback *cb);
int (*done)(struct netlink_callback *cb);
int family;
u16 family;
u16 min_dump_alloc;
long args[6];
};
@ -259,7 +260,8 @@ __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
int (*dump)(struct sk_buff *skb, struct netlink_callback*),
int (*done)(struct netlink_callback*));
int (*done)(struct netlink_callback*),
u16 min_dump_alloc);
#define NL_NONROOT_RECV 0x1

7
include/net/rtnetlink.h
View File

@ -6,11 +6,14 @@
typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *, void *);
typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);
typedef u16 (*rtnl_calcit_func)(struct sk_buff *);
extern int __rtnl_register(int protocol, int msgtype,
rtnl_doit_func, rtnl_dumpit_func);
rtnl_doit_func, rtnl_dumpit_func,
rtnl_calcit_func);
extern void rtnl_register(int protocol, int msgtype,
rtnl_doit_func, rtnl_dumpit_func);
rtnl_doit_func, rtnl_dumpit_func,
rtnl_calcit_func);
extern int rtnl_unregister(int protocol, int msgtype);
extern void rtnl_unregister_all(int protocol);

15
net/bridge/br_netlink.c
View File

@ -218,19 +218,24 @@ int __init br_netlink_init(void)
if (err < 0)
goto err1;
err = __rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo);
err = __rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL,
br_dump_ifinfo, NULL);
if (err)
goto err2;
err = __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL);
err = __rtnl_register(PF_BRIDGE, RTM_SETLINK,
br_rtm_setlink, NULL, NULL);
if (err)
goto err3;
err = __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH, br_fdb_add, NULL);
err = __rtnl_register(PF_BRIDGE, RTM_NEWNEIGH,
br_fdb_add, NULL, NULL);
if (err)
goto err3;
err = __rtnl_register(PF_BRIDGE, RTM_DELNEIGH, br_fdb_delete, NULL);
err = __rtnl_register(PF_BRIDGE, RTM_DELNEIGH,
br_fdb_delete, NULL, NULL);
if (err)
goto err3;
err = __rtnl_register(PF_BRIDGE, RTM_GETNEIGH, NULL, br_fdb_dump);
err = __rtnl_register(PF_BRIDGE, RTM_GETNEIGH,
NULL, br_fdb_dump, NULL);
if (err)
goto err3;

6
net/core/fib_rules.c
View File

@ -740,9 +740,9 @@ static struct pernet_operations fib_rules_net_ops = {
static int __init fib_rules_init(void)
{
int err;
rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL);
rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, NULL);
err = register_pernet_subsys(&fib_rules_net_ops);
if (err < 0)

11
net/core/neighbour.c
View File

@ -2909,12 +2909,13 @@ EXPORT_SYMBOL(neigh_sysctl_unregister);
static int __init neigh_init(void)
{
rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL);
rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL);
rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info);
rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, NULL);
rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info);
rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL);
rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info,
NULL);
rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, NULL);
return 0;
}

60
net/core/rtnetlink.c
View File

@ -56,9 +56,11 @@
struct rtnl_link {
rtnl_doit_func doit;
rtnl_dumpit_func dumpit;
rtnl_calcit_func calcit;
};
static DEFINE_MUTEX(rtnl_mutex);
static u16 min_ifinfo_dump_size;
void rtnl_lock(void)
{
@ -144,12 +146,28 @@ static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
return tab ? tab[msgindex].dumpit : NULL;
}
static rtnl_calcit_func rtnl_get_calcit(int protocol, int msgindex)
{
struct rtnl_link *tab;
if (protocol <= RTNL_FAMILY_MAX)
tab = rtnl_msg_handlers[protocol];
else
tab = NULL;
if (tab == NULL || tab[msgindex].calcit == NULL)
tab = rtnl_msg_handlers[PF_UNSPEC];
return tab ? tab[msgindex].calcit : NULL;
}
/**
* __rtnl_register - Register a rtnetlink message type
* @protocol: Protocol family or PF_UNSPEC
* @msgtype: rtnetlink message type
* @doit: Function pointer called for each request message
* @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
* @calcit: Function pointer to calc size of dump message
*
* Registers the specified function pointers (at least one of them has
* to be non-NULL) to be called whenever a request message for the
@ -162,7 +180,8 @@ static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
* Returns 0 on success or a negative error code.
*/
int __rtnl_register(int protocol, int msgtype,
rtnl_doit_func doit, rtnl_dumpit_func dumpit)
rtnl_doit_func doit, rtnl_dumpit_func dumpit,
rtnl_calcit_func calcit)
{
struct rtnl_link *tab;
int msgindex;
@ -185,6 +204,9 @@ int __rtnl_register(int protocol, int msgtype,
if (dumpit)
tab[msgindex].dumpit = dumpit;
if (calcit)
tab[msgindex].calcit = calcit;
return 0;
}
EXPORT_SYMBOL_GPL(__rtnl_register);
@ -199,9 +221,10 @@ EXPORT_SYMBOL_GPL(__rtnl_register);
* of memory implies no sense in continuing.
*/
void rtnl_register(int protocol, int msgtype,
rtnl_doit_func doit, rtnl_dumpit_func dumpit)
rtnl_doit_func doit, rtnl_dumpit_func dumpit,
rtnl_calcit_func calcit)
{
if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
if (__rtnl_register(protocol, msgtype, doit, dumpit, calcit) < 0)
panic("Unable to register rtnetlink message handler, "
"protocol = %d, message type = %d\n",
protocol, msgtype);
@ -1818,6 +1841,11 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
return err;
}
static u16 rtnl_calcit(struct sk_buff *skb)
{
return min_ifinfo_dump_size;
}
static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
{
int idx;
@ -1847,11 +1875,14 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
struct net *net = dev_net(dev);
struct sk_buff *skb;
int err = -ENOBUFS;
size_t if_info_size;
skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
skb = nlmsg_new((if_info_size = if_nlmsg_size(dev)), GFP_KERNEL);
if (skb == NULL)
goto errout;
min_ifinfo_dump_size = max_t(u16, if_info_size, min_ifinfo_dump_size);
err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_size() */
@ -1902,14 +1933,20 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
struct sock *rtnl;
rtnl_dumpit_func dumpit;
rtnl_calcit_func calcit;
u16 min_dump_alloc = 0;
dumpit = rtnl_get_dumpit(family, type);
if (dumpit == NULL)
return -EOPNOTSUPP;
calcit = rtnl_get_calcit(family, type);
if (calcit)
min_dump_alloc = calcit(skb);
__rtnl_unlock();
rtnl = net->rtnl;
err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
err = netlink_dump_start(rtnl, skb, nlh, dumpit,
NULL, min_dump_alloc);
rtnl_lock();
return err;
}
@ -2019,12 +2056,13 @@ void __init rtnetlink_init(void)
netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
register_netdevice_notifier(&rtnetlink_dev_notifier);
rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink,
rtnl_dump_ifinfo, rtnl_calcit);
rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all, NULL);
rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all, NULL);
}

4
net/dcb/dcbnl.c
View File

@ -1819,8 +1819,8 @@ static int __init dcbnl_init(void)
{
INIT_LIST_HEAD(&dcb_app_list);
rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL);
rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL);
rtnl_register(PF_UNSPEC, RTM_GETDCB, dcb_doit, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_SETDCB, dcb_doit, NULL, NULL);
return 0;
}

6
net/decnet/dn_dev.c
View File

@ -1414,9 +1414,9 @@ void __init dn_dev_init(void)
dn_dev_devices_on();
rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);

4
net/decnet/dn_fib.c
View File

@ -763,8 +763,8 @@ void __init dn_fib_init(void)
register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL);
rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL);
rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL);
rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL);
}

5
net/decnet/dn_route.c
View File

@ -1841,10 +1841,11 @@ void __init dn_route_init(void)
proc_net_fops_create(&init_net, "decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
#ifdef CONFIG_DECNET_ROUTER
rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute, dn_fib_dump);
rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
dn_fib_dump, NULL);
#else
rtnl_register(PF_DECnet, RTM_GETROUTE, dn_cache_getroute,
dn_cache_dump);
dn_cache_dump, NULL);
#endif
}

6
net/ipv4/devinet.c
View File

@ -1833,8 +1833,8 @@ void __init devinet_init(void)
rtnl_af_register(&inet_af_ops);
rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
}

6
net/ipv4/fib_frontend.c
View File

@ -1124,9 +1124,9 @@ static struct pernet_operations fib_net_ops = {
void __init ip_fib_init(void)
{
rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL);
rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL);
rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib);
rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL);
rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL);
rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL);
register_pernet_subsys(&fib_net_ops);
register_netdevice_notifier(&fib_netdev_notifier);

2
net/ipv4/inet_diag.c
View File

@ -871,7 +871,7 @@ static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
return netlink_dump_start(idiagnl, skb, nlh,
inet_diag_dump, NULL);
inet_diag_dump, NULL, 0);
}
return inet_diag_get_exact(skb, nlh);

3
net/ipv4/ipmr.c
View File

@ -2544,7 +2544,8 @@ int __init ip_mr_init(void)
goto add_proto_fail;
}
#endif
rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, NULL, ipmr_rtm_dumproute);
rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE,
NULL, ipmr_rtm_dumproute, NULL);
return 0;
#ifdef CONFIG_IP_PIMSM_V2

2
net/ipv4/route.c
View File

@ -3295,7 +3295,7 @@ int __init ip_rt_init(void)
xfrm_init();
xfrm4_init(ip_rt_max_size);
#endif
rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL);
rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL);
#ifdef CONFIG_SYSCTL
register_pernet_subsys(&sysctl_route_ops);

16
net/ipv6/addrconf.c
View File

@ -4727,16 +4727,20 @@ int __init addrconf_init(void)
if (err < 0)
goto errout_af;
err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
NULL);
if (err < 0)
goto errout;
/* Only the first call to __rtnl_register can fail */
__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
inet6_dump_ifaddr, NULL);
__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
inet6_dump_ifmcaddr, NULL);
__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
inet6_dump_ifacaddr, NULL);
ipv6_addr_label_rtnl_register();

9
net/ipv6/addrlabel.c
View File

@ -592,8 +592,11 @@ out:
void __init ipv6_addr_label_rtnl_register(void)
{
__rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel, NULL);
__rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel, NULL);
__rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get, ip6addrlbl_dump);
__rtnl_register(PF_INET6, RTM_NEWADDRLABEL, ip6addrlbl_newdel,
NULL, NULL);
__rtnl_register(PF_INET6, RTM_DELADDRLABEL, ip6addrlbl_newdel,
NULL, NULL);
__rtnl_register(PF_INET6, RTM_GETADDRLABEL, ip6addrlbl_get,
ip6addrlbl_dump, NULL);
}

3
net/ipv6/ip6_fib.c
View File

@ -1586,7 +1586,8 @@ int __init fib6_init(void)
if (ret)
goto out_kmem_cache_create;
ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib);
ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib,
NULL);
if (ret)
goto out_unregister_subsys;
out:

3
net/ipv6/ip6mr.c
View File

@ -1354,7 +1354,8 @@ int __init ip6_mr_init(void)
goto add_proto_fail;
}
#endif
rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL, ip6mr_rtm_dumproute);
rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
ip6mr_rtm_dumproute, NULL);
return 0;
#ifdef CONFIG_IPV6_PIMSM_V2
add_proto_fail:

6
net/ipv6/route.c
View File

@ -2925,9 +2925,9 @@ int __init ip6_route_init(void)
goto xfrm6_init;
ret = -ENOBUFS;
if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) ||
__rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) ||
__rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL))
if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
__rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
__rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
goto fib6_rules_init;
ret = register_netdevice_notifier(&ip6_route_dev_notifier);

2
net/netfilter/ipset/ip_set_core.c
View File

@ -1120,7 +1120,7 @@ ip_set_dump(struct sock *ctnl, struct sk_buff *skb,
return netlink_dump_start(ctnl, skb, nlh,
ip_set_dump_start,
ip_set_dump_done);
ip_set_dump_done, 0);
}
/* Add, del and test */

4
net/netfilter/nf_conntrack_netlink.c
View File

@ -970,7 +970,7 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
if (nlh->nlmsg_flags & NLM_F_DUMP)
return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
ctnetlink_done);
ctnetlink_done, 0);
err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
if (err < 0)
@ -1840,7 +1840,7 @@ ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
if (nlh->nlmsg_flags & NLM_F_DUMP) {
return netlink_dump_start(ctnl, skb, nlh,
ctnetlink_exp_dump_table,
ctnetlink_exp_done);
ctnetlink_exp_done, 0);
}
err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);

17
net/netlink/af_netlink.c
View File

@ -1659,13 +1659,10 @@ static int netlink_dump(struct sock *sk)
{
struct netlink_sock *nlk = nlk_sk(sk);
struct netlink_callback *cb;
struct sk_buff *skb;
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
int len, err = -ENOBUFS;
skb = sock_rmalloc(sk, NLMSG_GOODSIZE, 0, GFP_KERNEL);
if (!skb)
goto errout;
int alloc_size;
mutex_lock(nlk->cb_mutex);
@ -1675,6 +1672,12 @@ static int netlink_dump(struct sock *sk)
goto errout_skb;
}
alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE);
skb = sock_rmalloc(sk, alloc_size, 0, GFP_KERNEL);
if (!skb)
goto errout;
len = cb->dump(skb, cb);
if (len > 0) {
@ -1721,7 +1724,8 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
int (*dump)(struct sk_buff *skb,
struct netlink_callback *),
int (*done)(struct netlink_callback *))
int (*done)(struct netlink_callback *),
u16 min_dump_alloc)
{
struct netlink_callback *cb;
struct sock *sk;
@ -1735,6 +1739,7 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
cb->dump = dump;
cb->done = done;
cb->nlh = nlh;
cb->min_dump_alloc = min_dump_alloc;
atomic_inc(&skb->users);
cb->skb = skb;

2
net/netlink/genetlink.c
View File

@ -525,7 +525,7 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
genl_unlock();
err = netlink_dump_start(net->genl_sock, skb, nlh,
ops->dumpit, ops->done);
ops->dumpit, ops->done, 0);
genl_lock();
return err;
}

13
net/phonet/pn_netlink.c
View File

@ -289,15 +289,16 @@ out:
int __init phonet_netlink_register(void)
{
int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);
int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit,
NULL, NULL);
if (err)
return err;
/* Further __rtnl_register() cannot fail */
__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
__rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL);
__rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL);
__rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit);
__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL, NULL);
__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, NULL);
__rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL, NULL);
__rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL, NULL);
__rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit, NULL);
return 0;
}

7
net/sched/act_api.c
View File

@ -1115,9 +1115,10 @@ nlmsg_failure:
static int __init tc_action_init(void)
{
rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL);
rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL);
rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action);
rtnl_register(PF_UNSPEC, RTM_NEWACTION, tc_ctl_action, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_DELACTION, tc_ctl_action, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action,
NULL);
return 0;
}

6
net/sched/cls_api.c
View File

@ -610,10 +610,10 @@ EXPORT_SYMBOL(tcf_exts_dump_stats);
static int __init tc_filter_init(void)
{
rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL);
rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL);
rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
tc_dump_tfilter);
tc_dump_tfilter, NULL);
return 0;
}

12
net/sched/sch_api.c
View File

@ -1792,12 +1792,12 @@ static int __init pktsched_init(void)
register_qdisc(&pfifo_head_drop_qdisc_ops);
register_qdisc(&mq_qdisc_ops);
rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL);
rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL);
rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc);
rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL);
rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL);
rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass);
rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL);
rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL);
return 0;
}

3
net/xfrm/xfrm_user.c
View File

@ -2299,7 +2299,8 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (link->dump == NULL)
return -EINVAL;
return netlink_dump_start(net->xfrm.nlsk, skb, nlh, link->dump, link->done);
return netlink_dump_start(net->xfrm.nlsk, skb, nlh,
link->dump, link->done, 0);
}
err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,