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inet_diag: Do not use RTA_PUT() macros
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Also, no need to trim on nlmsg_put() failure, nothing has been added
yet.  We also want to use nlmsg_end(), nlmsg_new() and nlmsg_free().

Signed-off-by: Thomas Graf <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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@tgraf @davem330
tgraf authored and davem330 committed Jun 27, 2012
1 parent 7b46866 commit 6e277ed
Showing 1 changed file with 53 additions and 59 deletions.
112 changes: 53 additions & 59 deletions net/ipv4/inet_diag.c
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Original file line number Diff line number Diff line change
Expand Up @@ -46,9 +46,6 @@ struct inet_diag_entry {
u16 userlocks;
};

#define INET_DIAG_PUT(skb, attrtype, attrlen) \
RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))

static DEFINE_MUTEX(inet_diag_table_mutex);

static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
Expand Down Expand Up @@ -78,28 +75,22 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
const struct inet_sock *inet = inet_sk(sk);
struct inet_diag_msg *r;
struct nlmsghdr *nlh;
struct nlattr *attr;
void *info = NULL;
struct inet_diag_meminfo *minfo = NULL;
unsigned char *b = skb_tail_pointer(skb);
const struct inet_diag_handler *handler;
int ext = req->idiag_ext;

handler = inet_diag_table[req->sdiag_protocol];
BUG_ON(handler == NULL);

nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 0);
if (!nlh) {
nlmsg_trim(skb, b);
nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r),
nlmsg_flags);
if (!nlh)
return -EMSGSIZE;
}
nlh->nlmsg_flags = nlmsg_flags;

r = nlmsg_data(nlh);
BUG_ON(sk->sk_state == TCP_TIME_WAIT);

if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));

r->idiag_family = sk->sk_family;
r->idiag_state = sk->sk_state;
r->idiag_timer = 0;
Expand All @@ -117,32 +108,40 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
* hence this needs to be included regardless of socket family.
*/
if (ext & (1 << (INET_DIAG_TOS - 1)))
RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
goto errout;

#if IS_ENABLED(CONFIG_IPV6)
if (r->idiag_family == AF_INET6) {
const struct ipv6_pinfo *np = inet6_sk(sk);

*(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
*(struct in6_addr *)r->id.idiag_dst = np->daddr;

if (ext & (1 << (INET_DIAG_TCLASS - 1)))
RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
goto errout;
}
#endif

r->idiag_uid = sock_i_uid(sk);
r->idiag_inode = sock_i_ino(sk);

if (minfo) {
minfo->idiag_rmem = sk_rmem_alloc_get(sk);
minfo->idiag_wmem = sk->sk_wmem_queued;
minfo->idiag_fmem = sk->sk_forward_alloc;
minfo->idiag_tmem = sk_wmem_alloc_get(sk);
if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
struct inet_diag_meminfo minfo = {
.idiag_rmem = sk_rmem_alloc_get(sk),
.idiag_wmem = sk->sk_wmem_queued,
.idiag_fmem = sk->sk_forward_alloc,
.idiag_tmem = sk_wmem_alloc_get(sk),
};

if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
goto errout;
}

if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
goto rtattr_failure;
goto errout;

if (icsk == NULL) {
handler->idiag_get_info(sk, r, NULL);
Expand All @@ -169,28 +168,31 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
}
#undef EXPIRES_IN_MS

if (ext & (1 << (INET_DIAG_INFO - 1)))
info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info));
if (ext & (1 << (INET_DIAG_INFO - 1))) {
attr = nla_reserve(skb, INET_DIAG_INFO,
sizeof(struct tcp_info));
if (!attr)
goto errout;

if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
const size_t len = strlen(icsk->icsk_ca_ops->name);

strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
icsk->icsk_ca_ops->name);
info = nla_data(attr);
}

if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
if (nla_put_string(skb, INET_DIAG_CONG,
icsk->icsk_ca_ops->name) < 0)
goto errout;

handler->idiag_get_info(sk, r, info);

if (sk->sk_state < TCP_TIME_WAIT &&
icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
icsk->icsk_ca_ops->get_info(sk, ext, skb);

out:
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
return skb->len;
return nlmsg_end(skb, nlh);

rtattr_failure:
nlmsg_trim(skb, b);
errout:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
Expand All @@ -211,20 +213,16 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
{
long tmo;
struct inet_diag_msg *r;
const unsigned char *previous_tail = skb_tail_pointer(skb);
struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq,
unlh->nlmsg_type, sizeof(*r), 0);
struct nlmsghdr *nlh;

if (!nlh) {
nlmsg_trim(skb, previous_tail);
nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r),
nlmsg_flags);
if (!nlh)
return -EMSGSIZE;
}

r = nlmsg_data(nlh);
BUG_ON(tw->tw_state != TCP_TIME_WAIT);

nlh->nlmsg_flags = nlmsg_flags;

tmo = tw->tw_ttd - jiffies;
if (tmo < 0)
tmo = 0;
Expand Down Expand Up @@ -253,8 +251,8 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
*(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
}
#endif
nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
return skb->len;

return nlmsg_end(skb, nlh);
}

static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
Expand Down Expand Up @@ -303,20 +301,20 @@ int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_s
if (err)
goto out;

err = -ENOMEM;
rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
sizeof(struct inet_diag_meminfo) +
sizeof(struct tcp_info) + 64)),
GFP_KERNEL);
if (!rep)
rep = nlmsg_new(sizeof(struct inet_diag_msg) +
sizeof(struct inet_diag_meminfo) +
sizeof(struct tcp_info) + 64, GFP_KERNEL);
if (!rep) {
err = -ENOMEM;
goto out;
}

err = sk_diag_fill(sk, rep, req,
NETLINK_CB(in_skb).pid,
nlh->nlmsg_seq, 0, nlh);
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
kfree_skb(rep);
nlmsg_free(rep);
goto out;
}
err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
Expand Down Expand Up @@ -597,19 +595,16 @@ static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
{
const struct inet_request_sock *ireq = inet_rsk(req);
struct inet_sock *inet = inet_sk(sk);
unsigned char *b = skb_tail_pointer(skb);
struct inet_diag_msg *r;
struct nlmsghdr *nlh;
long tmo;

nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 0);
if (!nlh) {
nlmsg_trim(skb, b);
return -1;
}
nlh->nlmsg_flags = NLM_F_MULTI;
r = nlmsg_data(nlh);
nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r),
NLM_F_MULTI);
if (!nlh)
return -EMSGSIZE;

r = nlmsg_data(nlh);
r->idiag_family = sk->sk_family;
r->idiag_state = TCP_SYN_RECV;
r->idiag_timer = 1;
Expand Down Expand Up @@ -637,9 +632,8 @@ static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
*(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
}
#endif
nlh->nlmsg_len = skb_tail_pointer(skb) - b;

return skb->len;
return nlmsg_end(skb, nlh);
}

static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
Expand Down

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