[DCCP] options: Make dccp_insert_options & friends yell on error

And not the silly LIMIT_NETDEBUG and silently return without inserting
the option requested.

Also drop some old debugging messages associated to option insertion.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 46 insertions, 63 deletions

diff --git a/net/dccp/options.c b/net/dccp/options.c
index 0161a18e739a..da1676016484 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -283,17 +283,14 @@ static inline int dccp_ndp_len(const int ndp)
         return likely(ndp <= 0xFF) ? 1 : ndp <= 0xFFFF ? 2 : 3;
 }
 
-void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
+int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
                         const unsigned char option,
                         const void *value, const unsigned char len)
 {
         unsigned char *to;
 
-        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN) {
-                LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
-                               "%d option!\n", option);
-                return;
-        }
+        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 2 > DCCP_MAX_OPT_LEN)
+                return -1;
 
         DCCP_SKB_CB(skb)->dccpd_opt_len += len + 2;
 
@@ -302,11 +299,12 @@ void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
         *to++ = len + 2;
 
         memcpy(to, value, len);
+        return 0;
 }
 
 EXPORT_SYMBOL_GPL(dccp_insert_option);
 
-static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
+static int dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
 {
         struct dccp_sock *dp = dccp_sk(sk);
         int ndp = dp->dccps_ndp_count;
@@ -322,7 +320,7 @@ static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
                 const int len = ndp_len + 2;
 
                 if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
-                        return;
+                        return -1;
 
                 DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 
@@ -331,6 +329,8 @@ static void dccp_insert_option_ndp(struct sock *sk, struct sk_buff *skb)
                 *ptr++ = len;
                 dccp_encode_value_var(ndp, ptr, ndp_len);
         }
+
+        return 0;
 }
 
 static inline int dccp_elapsed_time_len(const u32 elapsed_time)
@@ -338,27 +338,18 @@ static inline int dccp_elapsed_time_len(const u32 elapsed_time)
         return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
 }
 
-void dccp_insert_option_elapsed_time(struct sock *sk,
-                                     struct sk_buff *skb,
-                                     u32 elapsed_time)
+int dccp_insert_option_elapsed_time(struct sock *sk, struct sk_buff *skb,
+                                    u32 elapsed_time)
 {
-#ifdef CONFIG_IP_DCCP_DEBUG
-        struct dccp_sock *dp = dccp_sk(sk);
-        const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
-                                        "CLIENT TX opt: " : "server TX opt: ";
-#endif
         const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
         const int len = 2 + elapsed_time_len;
         unsigned char *to;
 
         if (elapsed_time_len == 0)
-                return;
+                return 0;
 
-        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
-                LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to "
-                                         "insert elapsed time!\n");
-                return;
-        }
+        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
+                return -1;
 
         DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 
@@ -374,10 +365,7 @@ void dccp_insert_option_elapsed_time(struct sock *sk,
                 memcpy(to, &var32, 4);
         }
 
-        dccp_pr_debug("%sELAPSED_TIME=%u, len=%d, seqno=%llu\n",
-                      debug_prefix, elapsed_time,
-                      len,
-                      (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
+        return 0;
 }
 
 EXPORT_SYMBOL_GPL(dccp_insert_option_elapsed_time);
@@ -398,7 +386,7 @@ void dccp_timestamp(const struct sock *sk, struct timeval *tv)
 
 EXPORT_SYMBOL_GPL(dccp_timestamp);
 
-void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
+int dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
 {
         struct timeval tv;
         __be32 now;
@@ -408,19 +396,15 @@ void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
         /* yes this will overflow but that is the point as we want a
          * 10 usec 32 bit timer which mean it wraps every 11.9 hours */
 
-        dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
+        return dccp_insert_option(sk, skb, DCCPO_TIMESTAMP, &now, sizeof(now));
 }
 
 EXPORT_SYMBOL_GPL(dccp_insert_option_timestamp);
 
-static void dccp_insert_option_timestamp_echo(struct sock *sk,
-                                              struct sk_buff *skb)
+static int dccp_insert_option_timestamp_echo(struct sock *sk,
+                                             struct sk_buff *skb)
 {
         struct dccp_sock *dp = dccp_sk(sk);
-#ifdef CONFIG_IP_DCCP_DEBUG
-        const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
-                                        "CLIENT TX opt: " : "server TX opt: ";
-#endif
         struct timeval now;
         __be32 tstamp_echo;
         u32 elapsed_time;
@@ -432,11 +416,8 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk,
         elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
         len = 6 + elapsed_time_len;
 
-        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
-                LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
-                                         "timestamp echo!\n");
-                return;
-        }
+        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
+                return -1;
 
         DCCP_SKB_CB(skb)->dccpd_opt_len += len;
 
@@ -456,14 +437,10 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk,
                 memcpy(to, &var32, 4);
         }
 
-        dccp_pr_debug("%sTIMESTAMP_ECHO=%u, len=%d, seqno=%llu\n",
-                      debug_prefix, dp->dccps_timestamp_echo,
-                      len,
-                      (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq);
-
         dp->dccps_timestamp_echo = 0;
         dp->dccps_timestamp_time.tv_sec = 0;
         dp->dccps_timestamp_time.tv_usec = 0;
+        return 0;
 }
 
 static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
@@ -491,7 +468,7 @@ static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
         return 0;
 }
 
-static void dccp_insert_feat(struct sock *sk, struct sk_buff *skb)
+static int dccp_insert_options_feat(struct sock *sk, struct sk_buff *skb)
 {
         struct dccp_sock *dp = dccp_sk(sk);
         struct dccp_opt_pend *opt, *next;
@@ -551,44 +528,48 @@ static void dccp_insert_feat(struct sock *sk, struct sk_buff *skb)
                 inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
                                           inet_csk(sk)->icsk_rto, DCCP_RTO_MAX);
         }
+
+        return 0;
 }
 
-void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
+int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
 {
         struct dccp_sock *dp = dccp_sk(sk);
 
         DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
 
-        if (dp->dccps_options.dccpo_send_ndp_count)
-                dccp_insert_option_ndp(sk, skb);
+        if (dp->dccps_options.dccpo_send_ndp_count &&
+            dccp_insert_option_ndp(sk, skb))
+                return -1;
 
         if (!dccp_packet_without_ack(skb)) {
                 if (dp->dccps_options.dccpo_send_ack_vector &&
-                    dccp_ackvec_pending(dp->dccps_hc_rx_ackvec))
-                        dccp_insert_option_ackvec(sk, skb);
-                if (dp->dccps_timestamp_echo != 0)
-                        dccp_insert_option_timestamp_echo(sk, skb);
+                    dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
+                    dccp_insert_option_ackvec(sk, skb))
+                        return -1;
+
+                if (dp->dccps_timestamp_echo != 0 &&
+                    dccp_insert_option_timestamp_echo(sk, skb))
+                        return -1;
         }
 
         if (dp->dccps_hc_rx_insert_options) {
-                ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb);
+                if (ccid_hc_rx_insert_options(dp->dccps_hc_rx_ccid, sk, skb))
+                        return -1;
                 dp->dccps_hc_rx_insert_options = 0;
         }
         if (dp->dccps_hc_tx_insert_options) {
-                ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb);
+                if (ccid_hc_tx_insert_options(dp->dccps_hc_tx_ccid, sk, skb))
+                        return -1;
                 dp->dccps_hc_tx_insert_options = 0;
         }
 
         /* Feature negotiation */
-        switch(DCCP_SKB_CB(skb)->dccpd_type) {
-                /* Data packets can't do feat negotiation */
-        case DCCP_PKT_DATA:
-        case DCCP_PKT_DATAACK:
-                break;
-        default:
-                dccp_insert_feat(sk, skb);
-                break;
-        }
+        /* Data packets can't do feat negotiation */
+        if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA &&
+            DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATAACK &&
+            dccp_insert_options_feat(sk, skb))
+                return -1;
 
         /* XXX: insert other options when appropriate */
 
@@ -602,4 +583,6 @@ void dccp_insert_options(struct sock *sk, struct sk_buff *skb)
                         DCCP_SKB_CB(skb)->dccpd_opt_len += padding;
                 }
         }
+
+        return 0;
 }