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[NETLINK]: Use group numbers instead of bitmasks internally 

Using the group number allows increasing the number of groups without
beeing limited by the size of the bitmask. It introduces one limitation
for netlink users: messages can't be broadcasted to multiple groups anymore,
however this feature was never used inside the kernel.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2005-08-14 19:27:50 -07:00 committed by David S. Miller
parent 77247bbb30
commit d629b836d1
2 changed files with 21 additions and 16 deletions
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2
include/linux/netlink.h
View File

@ -107,7 +107,7 @@ struct netlink_skb_parms
struct ucred creds; /* Skb credentials */
__u32 pid;
__u32 dst_pid;
__u32 dst_groups;
__u32 dst_group;
kernel_cap_t eff_cap;
__u32 loginuid; /* Login (audit) uid */
};

35
net/netlink/af_netlink.c
View File

@ -67,7 +67,7 @@ struct netlink_sock {
u32 pid;
unsigned int groups;
u32 dst_pid;
unsigned int dst_groups;
u32 dst_group;
unsigned long state;
wait_queue_head_t wait;
struct netlink_callback *cb;
@ -116,6 +116,11 @@ static atomic_t nl_table_users = ATOMIC_INIT(0);
static struct notifier_block *netlink_chain;
static u32 netlink_group_mask(u32 group)
{
return group ? 1 << (group - 1) : 0;
}
static struct hlist_head *nl_pid_hashfn(struct nl_pid_hash *hash, u32 pid)
{
return &hash->table[jhash_1word(pid, hash->rnd) & hash->mask];
@ -533,7 +538,7 @@ static int netlink_connect(struct socket *sock, struct sockaddr *addr,
if (addr->sa_family == AF_UNSPEC) {
sk->sk_state = NETLINK_UNCONNECTED;
nlk->dst_pid = 0;
nlk->dst_groups = 0;
nlk->dst_group = 0;
return 0;
}
if (addr->sa_family != AF_NETLINK)
@ -549,7 +554,7 @@ static int netlink_connect(struct socket *sock, struct sockaddr *addr,
if (err == 0) {
sk->sk_state = NETLINK_CONNECTED;
nlk->dst_pid = nladdr->nl_pid;
nlk->dst_groups = nladdr->nl_groups;
nlk->dst_group = ffs(nladdr->nl_groups);
}
return err;
@ -567,10 +572,10 @@ static int netlink_getname(struct socket *sock, struct sockaddr *addr, int *addr
if (peer) {
nladdr->nl_pid = nlk->dst_pid;
nladdr->nl_groups = nlk->dst_groups;
nladdr->nl_groups = netlink_group_mask(nlk->dst_group);
} else {
nladdr->nl_pid = nlk->pid;
nladdr->nl_groups = nlk->groups;
nladdr->nl_groups = nlk->groups;
}
return 0;
}
@ -771,7 +776,7 @@ static inline int do_one_broadcast(struct sock *sk,
if (p->exclude_sk == sk)
goto out;
if (nlk->pid == p->pid || !(nlk->groups & p->group))
if (nlk->pid == p->pid || !(nlk->groups & netlink_group_mask(p->group)))
goto out;
if (p->failure) {
@ -867,7 +872,7 @@ static inline int do_one_set_err(struct sock *sk,
if (sk == p->exclude_sk)
goto out;
if (nlk->pid == p->pid || !(nlk->groups & p->group))
if (nlk->pid == p->pid || !(nlk->groups & netlink_group_mask(p->group)))
goto out;
sk->sk_err = p->code;
@ -913,7 +918,7 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
struct netlink_sock *nlk = nlk_sk(sk);
struct sockaddr_nl *addr=msg->msg_name;
u32 dst_pid;
u32 dst_groups;
u32 dst_group;
struct sk_buff *skb;
int err;
struct scm_cookie scm;
@ -931,12 +936,12 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
if (addr->nl_family != AF_NETLINK)
return -EINVAL;
dst_pid = addr->nl_pid;
dst_groups = addr->nl_groups;
if (dst_groups && !netlink_capable(sock, NL_NONROOT_SEND))
dst_group = ffs(addr->nl_groups);
if (dst_group && !netlink_capable(sock, NL_NONROOT_SEND))
return -EPERM;
} else {
dst_pid = nlk->dst_pid;
dst_groups = nlk->dst_groups;
dst_group = nlk->dst_group;
}
if (!nlk->pid) {
@ -955,7 +960,7 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
NETLINK_CB(skb).pid = nlk->pid;
NETLINK_CB(skb).dst_pid = dst_pid;
NETLINK_CB(skb).dst_groups = dst_groups;
NETLINK_CB(skb).dst_group = dst_group;
NETLINK_CB(skb).loginuid = audit_get_loginuid(current->audit_context);
memcpy(NETLINK_CREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
@ -977,9 +982,9 @@ static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock,
goto out;
}
if (dst_groups) {
if (dst_group) {
atomic_inc(&skb->users);
netlink_broadcast(sk, skb, dst_pid, dst_groups, GFP_KERNEL);
netlink_broadcast(sk, skb, dst_pid, dst_group, GFP_KERNEL);
}
err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT);
@ -1025,7 +1030,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
addr->nl_family = AF_NETLINK;
addr->nl_pad = 0;
addr->nl_pid = NETLINK_CB(skb).pid;
addr->nl_groups = NETLINK_CB(skb).dst_groups;
addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group);
msg->msg_namelen = sizeof(*addr);
}