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rtnetlink: Remove passing of attributes into rtnl_doit functions

Browse Source 
With decnet converted, we can finally get rid of rta_buf and its
computations around it. It also gets rid of the minimal header
length verification since all message handlers do that explicitly
anyway.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2013-03-21 07:45:29 +00:00 committed by David S. Miller
parent 58d7d8f9b2
commit 661d2967b3
20 changed files with 47 additions and 117 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/rtnetlink.h
View File

@ -4,7 +4,7 @@
#include <linux/rtnetlink.h>
#include <net/netlink.h>
typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *, void *);
typedef int (*rtnl_doit_func)(struct sk_buff *, struct nlmsghdr *);
typedef int (*rtnl_dumpit_func)(struct sk_buff *, struct netlink_callback *);
typedef u16 (*rtnl_calcit_func)(struct sk_buff *, struct nlmsghdr *);

4
net/bridge/br_mdb.c
View File

@ -382,7 +382,7 @@ static int __br_mdb_add(struct net *net, struct net_bridge *br,
return ret;
}
static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct br_mdb_entry *entry;
@ -458,7 +458,7 @@ unlock:
return err;
}
static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net_device *dev;
struct br_mdb_entry *entry;

5
net/can/gw.c
View File

@ -778,8 +778,7 @@ static int cgw_parse_attr(struct nlmsghdr *nlh, struct cf_mod *mod,
return 0;
}
static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh,
void *arg)
static int cgw_create_job(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct rtcanmsg *r;
struct cgw_job *gwj;
@ -868,7 +867,7 @@ static void cgw_remove_all_jobs(void)
}
}
static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct cgw_job *gwj = NULL;
struct hlist_node *nx;

4
net/core/fib_rules.c
View File

@ -266,7 +266,7 @@ errout:
return err;
}
static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
static int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr* nlh)
{
struct net *net = sock_net(skb->sk);
struct fib_rule_hdr *frh = nlmsg_data(nlh);
@ -415,7 +415,7 @@ errout:
return err;
}
static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh)
{
struct net *net = sock_net(skb->sk);
struct fib_rule_hdr *frh = nlmsg_data(nlh);

6
net/core/neighbour.c
View File

@ -1613,7 +1613,7 @@ int neigh_table_clear(struct neigh_table *tbl)
}
EXPORT_SYMBOL(neigh_table_clear);
static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ndmsg *ndm;
@ -1677,7 +1677,7 @@ out:
return err;
}
static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ndmsg *ndm;
@ -1955,7 +1955,7 @@ static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = {
[NDTPA_LOCKTIME] = { .type = NLA_U64 },
};
static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct neigh_table *tbl;

82
net/core/rtnetlink.c
View File

@ -515,32 +515,6 @@ out:
return err;
}
static const int rtm_min[RTM_NR_FAMILIES] =
{
[RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
[RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
[RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
[RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
[RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
[RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
[RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
[RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
[RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
[RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
};
static const int rta_max[RTM_NR_FAMILIES] =
{
[RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
[RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
[RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
[RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
[RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
[RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
[RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
[RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
};
int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group, int echo)
{
struct sock *rtnl = net->rtnl;
@ -1537,7 +1511,7 @@ errout:
return err;
}
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
@ -1578,7 +1552,7 @@ errout:
return err;
}
static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
const struct rtnl_link_ops *ops;
@ -1709,7 +1683,7 @@ static int rtnl_group_changelink(struct net *net, int group,
return 0;
}
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
const struct rtnl_link_ops *ops;
@ -1864,7 +1838,7 @@ out:
}
}
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
@ -2081,7 +2055,7 @@ int ndo_dflt_fdb_add(struct ndmsg *ndm,
}
EXPORT_SYMBOL(ndo_dflt_fdb_add);
static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int rtnl_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ndmsg *ndm;
@ -2179,7 +2153,7 @@ int ndo_dflt_fdb_del(struct ndmsg *ndm,
}
EXPORT_SYMBOL(ndo_dflt_fdb_del);
static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int rtnl_fdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ndmsg *ndm;
@ -2478,8 +2452,7 @@ errout:
return err;
}
static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
void *arg)
static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
@ -2549,8 +2522,7 @@ out:
return err;
}
static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
void *arg)
static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ifinfomsg *ifm;
@ -2620,10 +2592,6 @@ out:
return err;
}
/* Protected by RTNL sempahore. */
static struct rtattr **rta_buf;
static int rtattr_max;
/* Process one rtnetlink message. */
static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
@ -2631,7 +2599,6 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct net *net = sock_net(skb->sk);
rtnl_doit_func doit;
int sz_idx, kind;
int min_len;
int family;
int type;
int err;
@ -2679,32 +2646,11 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
return err;
}
memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
min_len = rtm_min[sz_idx];
if (nlh->nlmsg_len < min_len)
return -EINVAL;
if (nlh->nlmsg_len > min_len) {
int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
struct rtattr *attr = (void *)nlh + NLMSG_ALIGN(min_len);
while (RTA_OK(attr, attrlen)) {
unsigned int flavor = attr->rta_type & NLA_TYPE_MASK;
if (flavor) {
if (flavor > rta_max[sz_idx])
return -EINVAL;
rta_buf[flavor-1] = attr;
}
attr = RTA_NEXT(attr, attrlen);
}
}
doit = rtnl_get_doit(family, type);
if (doit == NULL)
return -EOPNOTSUPP;
return doit(skb, nlh, (void *)&rta_buf[0]);
return doit(skb, nlh);
}
static void rtnetlink_rcv(struct sk_buff *skb)
@ -2774,16 +2720,6 @@ static struct pernet_operations rtnetlink_net_ops = {
void __init rtnetlink_init(void)
{
int i;
rtattr_max = 0;
for (i = 0; i < ARRAY_SIZE(rta_max); i++)
if (rta_max[i] > rtattr_max)
rtattr_max = rta_max[i];
rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
if (!rta_buf)
panic("rtnetlink_init: cannot allocate rta_buf\n");
if (register_pernet_subsys(&rtnetlink_net_ops))
panic("rtnetlink_init: cannot initialize rtnetlink\n");

2
net/dcb/dcbnl.c
View File

@ -1658,7 +1658,7 @@ static const struct reply_func reply_funcs[DCB_CMD_MAX+1] = {
[DCB_CMD_CEE_GET] = { RTM_GETDCB, dcbnl_cee_get },
};
static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int dcb_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct net_device *netdev;

4
net/decnet/dn_dev.c
View File

@ -563,7 +563,7 @@ static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
.len = IFNAMSIZ - 1 },
};
static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tb[IFA_MAX+1];
@ -607,7 +607,7 @@ errout:
return err;
}
static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tb[IFA_MAX+1];

4
net/decnet/dn_fib.c
View File

@ -511,7 +511,7 @@ static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table)
return table;
}
static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct dn_fib_table *tb;
@ -536,7 +536,7 @@ static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *
return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb));
}
static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct dn_fib_table *tb;

2
net/decnet/dn_route.c
View File

@ -1616,7 +1616,7 @@ errout:
/*
* This is called by both endnodes and routers now.
*/
static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(in_skb->sk);
struct rtmsg *rtm = nlmsg_data(nlh);

7
net/ipv4/devinet.c
View File

@ -536,7 +536,7 @@ struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
return NULL;
}
static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tb[IFA_MAX+1];
@ -775,7 +775,7 @@ static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
return NULL;
}
static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct in_ifaddr *ifa;
@ -1730,8 +1730,7 @@ static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
};
static int inet_netconf_get_devconf(struct sk_buff *in_skb,
struct nlmsghdr *nlh,
void *arg)
struct nlmsghdr *nlh)
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NETCONFA_MAX+1];

4
net/ipv4/fib_frontend.c
View File

@ -604,7 +604,7 @@ errout:
return err;
}
static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct fib_config cfg;
@ -626,7 +626,7 @@ errout:
return err;
}
static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct fib_config cfg;

2
net/ipv4/route.c
View File

@ -2311,7 +2311,7 @@ nla_put_failure:
return -EMSGSIZE;
}
static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(in_skb->sk);
struct rtmsg *rtm;

10
net/ipv6/addrconf.c
View File

@ -544,8 +544,7 @@ static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
};
static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
struct nlmsghdr *nlh,
void *arg)
struct nlmsghdr *nlh)
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NETCONFA_MAX+1];
@ -3578,7 +3577,7 @@ static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
};
static int
inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ifaddrmsg *ifm;
@ -3644,7 +3643,7 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
}
static int
inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ifaddrmsg *ifm;
@ -3983,8 +3982,7 @@ static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
return inet6_dump_addr(skb, cb, type);
}
static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
void *arg)
static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(in_skb->sk);
struct ifaddrmsg *ifm;

6
net/ipv6/addrlabel.c
View File

@ -414,8 +414,7 @@ static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
[IFAL_LABEL] = { .len = sizeof(u32), },
};
static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
void *arg)
static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct ifaddrlblmsg *ifal;
@ -530,8 +529,7 @@ static inline int ip6addrlbl_msgsize(void)
+ nla_total_size(4); /* IFAL_LABEL */
}
static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh,
void *arg)
static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh)
{
struct net *net = sock_net(in_skb->sk);
struct ifaddrlblmsg *ifal;

6
net/ipv6/route.c
View File

@ -2355,7 +2355,7 @@ beginning:
return last_err;
}
static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
{
struct fib6_config cfg;
int err;
@ -2370,7 +2370,7 @@ static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *a
return ip6_route_del(&cfg);
}
static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
{
struct fib6_config cfg;
int err;
@ -2562,7 +2562,7 @@ int rt6_dump_route(struct rt6_info *rt, void *p_arg)
prefix, 0, NLM_F_MULTI);
}
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[RTA_MAX+1];

4
net/phonet/pn_netlink.c
View File

@ -61,7 +61,7 @@ static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
[IFA_LOCAL] = { .type = NLA_U8 },
};
static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tb[IFA_MAX+1];
@ -224,7 +224,7 @@ static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
[RTA_OIF] = { .type = NLA_U32 },
};
static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tb[RTA_MAX+1];

2
net/sched/act_api.c
View File

@ -982,7 +982,7 @@ done:
return ret;
}
static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
static int tc_ctl_action(struct sk_buff *skb, struct nlmsghdr *n)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tca[TCA_ACT_MAX + 1];

2
net/sched/cls_api.c
View File

@ -118,7 +118,7 @@ static inline u32 tcf_auto_prio(struct tcf_proto *tp)
/* Add/change/delete/get a filter node */
static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tca[TCA_MAX + 1];

6
net/sched/sch_api.c
View File

@ -971,7 +971,7 @@ check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
* Delete/get qdisc.
*/
static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
{
struct net *net = sock_net(skb->sk);
struct tcmsg *tcm = nlmsg_data(n);
@ -1038,7 +1038,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
* Create/change qdisc.
*/
static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
{
struct net *net = sock_net(skb->sk);
struct tcmsg *tcm;
@ -1372,7 +1372,7 @@ done:
static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n)
{
struct net *net = sock_net(skb->sk);
struct tcmsg *tcm = nlmsg_data(n);