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nf_conntrack_netlink: Stop using NLA_PUT*().

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These macros contain a hidden goto, and are thus extremely error
prone and make code hard to audit.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-04-01 18:57:48 -04:00
parent 516ee48f0b
commit cc1eb43134
1 changed files with 49 additions and 34 deletions
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83
net/netfilter/nf_conntrack_netlink.c
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@ -66,7 +66,8 @@ ctnetlink_dump_tuples_proto(struct sk_buff *skb,
nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
goto nla_put_failure;
if (likely(l4proto->tuple_to_nlattr))
ret = l4proto->tuple_to_nlattr(skb, tuple);
@ -126,7 +127,8 @@ ctnetlink_dump_tuples(struct sk_buff *skb,
static inline int
ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
goto nla_put_failure;
return 0;
nla_put_failure:
@ -141,7 +143,8 @@ ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
if (timeout < 0)
timeout = 0;
NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
goto nla_put_failure;
return 0;
nla_put_failure:
@ -190,7 +193,8 @@ ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
if (!nest_helper)
goto nla_put_failure;
NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
goto nla_put_failure;
if (helper->to_nlattr)
helper->to_nlattr(skb, ct);
@ -214,8 +218,9 @@ dump_counters(struct sk_buff *skb, u64 pkts, u64 bytes,
if (!nest_count)
goto nla_put_failure;
NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts));
NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes));
if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
goto nla_put_failure;
nla_nest_end(skb, nest_count);
@ -260,11 +265,10 @@ ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
if (!nest_count)
goto nla_put_failure;
NLA_PUT_BE64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start));
if (tstamp->stop != 0) {
NLA_PUT_BE64(skb, CTA_TIMESTAMP_STOP,
cpu_to_be64(tstamp->stop));
}
if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
(tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
cpu_to_be64(tstamp->stop))))
goto nla_put_failure;
nla_nest_end(skb, nest_count);
return 0;
@ -277,7 +281,8 @@ nla_put_failure:
static inline int
ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
goto nla_put_failure;
return 0;
nla_put_failure:
@ -304,7 +309,8 @@ ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
if (!nest_secctx)
goto nla_put_failure;
NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
goto nla_put_failure;
nla_nest_end(skb, nest_secctx);
ret = 0;
@ -349,12 +355,13 @@ dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
if (!nest_parms)
goto nla_put_failure;
NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
htonl(natseq->correction_pos));
NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
htonl(natseq->offset_before));
NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
htonl(natseq->offset_after));
if (nla_put_be32(skb, CTA_NAT_SEQ_CORRECTION_POS,
htonl(natseq->correction_pos)) ||
nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
htonl(natseq->offset_before)) ||
nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
htonl(natseq->offset_after)))
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
@ -390,7 +397,8 @@ ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
static inline int
ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
goto nla_put_failure;
return 0;
nla_put_failure:
@ -400,7 +408,8 @@ nla_put_failure:
static inline int
ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
{
NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
goto nla_put_failure;
return 0;
nla_put_failure:
@ -440,8 +449,9 @@ ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, u32 type,
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (nf_ct_zone(ct))
NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
if (nf_ct_zone(ct) &&
nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
goto nla_put_failure;
if (ctnetlink_dump_status(skb, ct) < 0 ||
ctnetlink_dump_timeout(skb, ct) < 0 ||
@ -617,8 +627,9 @@ ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
if (nf_ct_zone(ct))
NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
if (nf_ct_zone(ct) &&
nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
goto nla_put_failure;
if (ctnetlink_dump_id(skb, ct) < 0)
goto nla_put_failure;
@ -1705,7 +1716,8 @@ ctnetlink_exp_dump_expect(struct sk_buff *skb,
if (!nest_parms)
goto nla_put_failure;
NLA_PUT_BE32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir));
if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
goto nla_put_failure;
nat_tuple.src.l3num = nf_ct_l3num(master);
nat_tuple.src.u3.ip = exp->saved_ip;
@ -1718,21 +1730,24 @@ ctnetlink_exp_dump_expect(struct sk_buff *skb,
nla_nest_end(skb, nest_parms);
}
#endif
NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
NLA_PUT_BE32(skb, CTA_EXPECT_CLASS, htonl(exp->class));
if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
goto nla_put_failure;
help = nfct_help(master);
if (help) {
struct nf_conntrack_helper *helper;
helper = rcu_dereference(help->helper);
if (helper)
NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
if (helper &&
nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
goto nla_put_failure;
}
expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
if (expfn != NULL)
NLA_PUT_STRING(skb, CTA_EXPECT_FN, expfn->name);
if (expfn != NULL &&
nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
goto nla_put_failure;
return 0;