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[DCCP]: Simplified conditions due to use of enum:8 states

Browse source 
This reaps the benefit of the earlier patch, which changed the type of
CCID 3 states to use enums, in that many conditions are now simplified
and the number of possible (unexpected) values is greatly reduced.

In a few instances, this also allowed to simplify pre-conditions; where
care has been taken to retain logical equivalence.

[DCCP]: Introduce a consistent BUG/WARN message scheme

This refines the existing set of DCCP messages so that
 * BUG(), BUG_ON(), WARN_ON() have meaningful DCCP-specific counterparts
 * DCCP_CRIT (for severe warnings) is not rate-limited
 * DCCP_WARN() is introduced as rate-limited wrapper

Using these allows a faster and cleaner transition to their original
counterparts once the code has matured into a full DCCP implementation.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Gerrit Renker 2006-11-20 18:39:23 -02:00 committed by David S. Miller
parent b1308dc015
commit 59348b19ef
14 changed files with 115 additions and 156 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
net/dccp/ackvec.c
View file

@ -461,9 +461,6 @@ int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
return 0; return 0;
} }
static char dccp_ackvec_slab_msg[] __initdata =
KERN_CRIT "DCCP: Unable to create ack vectors slab caches\n";
int __init dccp_ackvec_init(void) int __init dccp_ackvec_init(void)
{ {
dccp_ackvec_slab = kmem_cache_create("dccp_ackvec", dccp_ackvec_slab = kmem_cache_create("dccp_ackvec",
@ -485,7 +482,7 @@ int __init dccp_ackvec_init(void)
kmem_cache_destroy(dccp_ackvec_slab); kmem_cache_destroy(dccp_ackvec_slab);
dccp_ackvec_slab = NULL; dccp_ackvec_slab = NULL;
out_err: out_err:
printk(dccp_ackvec_slab_msg); DCCP_CRIT("Unable to create Ack Vector slab cache");
return -ENOBUFS; return -ENOBUFS;
} }

2
net/dccp/ccids/ccid2.c
View file

@ -420,7 +420,7 @@ static int ccid2_ackvector(struct sock *sk, struct sk_buff *skb, int offset,
return -1; return -1;
out_invalid_option: out_invalid_option:
BUG_ON(1); /* should never happen... options were previously parsed ! */ DCCP_BUG("Invalid option - this should not happen (previous parsing)!");
return -1; return -1;
} }

128
net/dccp/ccids/ccid3.c
View file

@ -176,8 +176,6 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
ccid3_tx_state_name(hctx->ccid3hctx_state)); ccid3_tx_state_name(hctx->ccid3hctx_state));
switch (hctx->ccid3hctx_state) { switch (hctx->ccid3hctx_state) {
case TFRC_SSTATE_TERM:
goto out;
case TFRC_SSTATE_NO_FBACK: case TFRC_SSTATE_NO_FBACK:
/* Halve send rate */ /* Halve send rate */
hctx->ccid3hctx_x /= 2; hctx->ccid3hctx_x /= 2;
@ -240,9 +238,10 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
2 * usecs_div(hctx->ccid3hctx_s, 2 * usecs_div(hctx->ccid3hctx_s,
hctx->ccid3hctx_x)); hctx->ccid3hctx_x));
break; break;
default: case TFRC_SSTATE_NO_SENT:
DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk, DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk);
hctx->ccid3hctx_state); /* fall through */
case TFRC_SSTATE_TERM:
goto out; goto out;
} }
@ -264,7 +263,7 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
long delay; long delay;
int rc = -ENOTCONN; int rc = -ENOTCONN;
BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); BUG_ON(hctx == NULL);
/* Check if pure ACK or Terminating*/ /* Check if pure ACK or Terminating*/
/* /*
@ -282,9 +281,8 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
rc = -ENOBUFS; rc = -ENOBUFS;
if (unlikely(new_packet == NULL)) { if (unlikely(new_packet == NULL)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, not enough " DCCP_WARN("%s, sk=%p, not enough mem to add to history,"
"mem to add to history, send refused\n", "send refused\n", dccp_role(sk), sk);
__FUNCTION__, dccp_role(sk), sk);
goto out; goto out;
} }
@ -317,9 +315,8 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
/* divide by -1000 is to convert to ms and get sign right */ /* divide by -1000 is to convert to ms and get sign right */
rc = delay > 0 ? delay : 0; rc = delay > 0 ? delay : 0;
break; break;
default: case TFRC_SSTATE_TERM:
DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk, DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
hctx->ccid3hctx_state);
rc = -EINVAL; rc = -EINVAL;
break; break;
} }
@ -343,7 +340,7 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct timeval now; struct timeval now;
BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); BUG_ON(hctx == NULL);
dccp_timestamp(sk, &now); dccp_timestamp(sk, &now);
@ -354,13 +351,11 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist); packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
if (unlikely(packet == NULL)) { if (unlikely(packet == NULL)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: packet doesn't " DCCP_WARN("packet doesn't exist in history!\n");
"exists in history!\n", __FUNCTION__);
return; return;
} }
if (unlikely(packet->dccphtx_sent)) { if (unlikely(packet->dccphtx_sent)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: no unsent packet in " DCCP_WARN("no unsent packet in history!\n");
"history!\n", __FUNCTION__);
return; return;
} }
packet->dccphtx_tstamp = now; packet->dccphtx_tstamp = now;
@ -395,9 +390,8 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
case TFRC_SSTATE_NO_SENT: case TFRC_SSTATE_NO_SENT:
/* if first wasn't pure ack */ /* if first wasn't pure ack */
if (len != 0) if (len != 0)
printk(KERN_CRIT "%s: %s, First packet sent is noted " DCCP_CRIT("%s, First packet sent is noted "
"as a data packet\n", "as a data packet", dccp_role(sk));
__FUNCTION__, dccp_role(sk));
return; return;
case TFRC_SSTATE_NO_FBACK: case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK: case TFRC_SSTATE_FBACK:
@ -410,9 +404,8 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
hctx->ccid3hctx_t_ipi); hctx->ccid3hctx_t_ipi);
} }
break; break;
default: case TFRC_SSTATE_TERM:
DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk, DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
hctx->ccid3hctx_state);
break; break;
} }
} }
@ -430,7 +423,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
u32 x_recv; u32 x_recv;
u32 r_sample; u32 r_sample;
BUG_ON(hctx == NULL || hctx->ccid3hctx_state == TFRC_SSTATE_TERM); BUG_ON(hctx == NULL);
/* we are only interested in ACKs */ /* we are only interested in ACKs */
if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
@ -455,9 +448,8 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist, packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
DCCP_SKB_CB(skb)->dccpd_ack_seq); DCCP_SKB_CB(skb)->dccpd_ack_seq);
if (unlikely(packet == NULL)) { if (unlikely(packet == NULL)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, seqno " DCCP_WARN("%s, sk=%p, seqno %llu(%s) does't exist "
"%llu(%s) does't exist in history!\n", "in history!\n", dccp_role(sk), sk,
__FUNCTION__, dccp_role(sk), sk,
(unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq, (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq,
dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type)); dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
return; return;
@ -467,9 +459,8 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
dccp_timestamp(sk, &now); dccp_timestamp(sk, &now);
r_sample = timeval_delta(&now, &packet->dccphtx_tstamp); r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
if (unlikely(r_sample <= t_elapsed)) if (unlikely(r_sample <= t_elapsed))
LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " DCCP_WARN("r_sample=%uus,t_elapsed=%uus\n",
"t_elapsed=%uus\n", r_sample, t_elapsed);
__FUNCTION__, r_sample, t_elapsed);
else else
r_sample -= t_elapsed; r_sample -= t_elapsed;
@ -554,9 +545,8 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
/* set idle flag */ /* set idle flag */
hctx->ccid3hctx_idle = 1; hctx->ccid3hctx_idle = 1;
break; break;
default: case TFRC_SSTATE_TERM:
DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk, DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
hctx->ccid3hctx_state);
break; break;
} }
} }
@ -596,9 +586,9 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
switch (option) { switch (option) {
case TFRC_OPT_LOSS_EVENT_RATE: case TFRC_OPT_LOSS_EVENT_RATE:
if (unlikely(len != 4)) { if (unlikely(len != 4)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " DCCP_WARN("%s, sk=%p, invalid len %d "
"len for TFRC_OPT_LOSS_EVENT_RATE\n", "for TFRC_OPT_LOSS_EVENT_RATE\n",
__FUNCTION__, dccp_role(sk), sk); dccp_role(sk), sk, len);
rc = -EINVAL; rc = -EINVAL;
} else { } else {
opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value); opt_recv->ccid3or_loss_event_rate = ntohl(*(__be32 *)value);
@ -617,9 +607,9 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
break; break;
case TFRC_OPT_RECEIVE_RATE: case TFRC_OPT_RECEIVE_RATE:
if (unlikely(len != 4)) { if (unlikely(len != 4)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, invalid " DCCP_WARN("%s, sk=%p, invalid len %d "
"len for TFRC_OPT_RECEIVE_RATE\n", "for TFRC_OPT_RECEIVE_RATE\n",
__FUNCTION__, dccp_role(sk), sk); dccp_role(sk), sk, len);
rc = -EINVAL; rc = -EINVAL;
} else { } else {
opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value); opt_recv->ccid3or_receive_rate = ntohl(*(__be32 *)value);
@ -722,17 +712,15 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
delta); delta);
} }
break; break;
default: case TFRC_RSTATE_TERM:
DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk, DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
hcrx->ccid3hcrx_state);
return; return;
} }
packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist); packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
if (unlikely(packet == NULL)) { if (unlikely(packet == NULL)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, no data packet " DCCP_WARN("%s, sk=%p, no data packet in history!\n",
"in history!\n", dccp_role(sk), sk);
__FUNCTION__, dccp_role(sk), sk);
return; return;
} }
@ -820,29 +808,29 @@ static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
} }
if (unlikely(step == 0)) { if (unlikely(step == 0)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, packet history " DCCP_WARN("%s, sk=%p, packet history has no data packets!\n",
"contains no data packets!\n", dccp_role(sk), sk);
__FUNCTION__, dccp_role(sk), sk);
return ~0; return ~0;
} }
if (unlikely(interval == 0)) { if (unlikely(interval == 0)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Could not find a " DCCP_WARN("%s, sk=%p, Could not find a win_count interval > 0."
"win_count interval > 0. Defaulting to 1\n", "Defaulting to 1\n", dccp_role(sk), sk);
__FUNCTION__, dccp_role(sk), sk);
interval = 1; interval = 1;
} }
found: found:
if (!tail) { if (!tail) {
LIMIT_NETDEBUG(KERN_WARNING "%s: tail is null\n", DCCP_CRIT("tail is null\n");
__FUNCTION__);
return ~0; return ~0;
} }
rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval; rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n", ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
dccp_role(sk), sk, rtt); dccp_role(sk), sk, rtt);
if (rtt == 0)
if (rtt == 0) {
DCCP_WARN("RTT==0, setting to 1\n");
rtt = 1; rtt = 1;
}
dccp_timestamp(sk, &tstamp); dccp_timestamp(sk, &tstamp);
delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback); delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
@ -856,9 +844,7 @@ static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
tmp2 = (u32)tmp1; tmp2 = (u32)tmp1;
if (!tmp2) { if (!tmp2) {
LIMIT_NETDEBUG(KERN_WARNING "tmp2 = 0 " DCCP_CRIT("tmp2 = 0, x_recv = %u, rtt =%u\n", x_recv, rtt);
"%s: x_recv = %u, rtt =%u\n",
__FUNCTION__, x_recv, rtt);
return ~0; return ~0;
} }
@ -904,8 +890,7 @@ static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC); entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC);
if (entry == NULL) { if (entry == NULL) {
printk(KERN_CRIT "%s: out of memory\n",__FUNCTION__); DCCP_BUG("out of memory - can not allocate entry");
dump_stack();
return; return;
} }
@ -984,9 +969,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
u32 p_prev, rtt_prev, r_sample, t_elapsed; u32 p_prev, rtt_prev, r_sample, t_elapsed;
int loss; int loss;
BUG_ON(hcrx == NULL || BUG_ON(hcrx == NULL);
!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
opt_recv = &dccp_sk(sk)->dccps_options_received; opt_recv = &dccp_sk(sk)->dccps_options_received;
@ -1004,9 +987,8 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
t_elapsed = opt_recv->dccpor_elapsed_time * 10; t_elapsed = opt_recv->dccpor_elapsed_time * 10;
if (unlikely(r_sample <= t_elapsed)) if (unlikely(r_sample <= t_elapsed))
LIMIT_NETDEBUG(KERN_WARNING "%s: r_sample=%uus, " DCCP_WARN("r_sample=%uus, t_elapsed=%uus\n",
"t_elapsed=%uus\n", r_sample, t_elapsed);
__FUNCTION__, r_sample, t_elapsed);
else else
r_sample -= t_elapsed; r_sample -= t_elapsed;
@ -1030,9 +1012,8 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp, packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
skb, SLAB_ATOMIC); skb, SLAB_ATOMIC);
if (unlikely(packet == NULL)) { if (unlikely(packet == NULL)) {
LIMIT_NETDEBUG(KERN_WARNING "%s: %s, sk=%p, Not enough mem to " DCCP_WARN("%s, sk=%p, Not enough mem to add rx packet "
"add rx packet to history, consider it lost!\n", "to history, consider it lost!\n", dccp_role(sk), sk);
__FUNCTION__, dccp_role(sk), sk);
return; return;
} }
@ -1065,9 +1046,8 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
ccid3_hc_rx_send_feedback(sk); ccid3_hc_rx_send_feedback(sk);
} }
return; return;
default: case TFRC_RSTATE_TERM:
DCCP_BUG("%s, sk=%p, Illegal state (%d)!", dccp_role(sk), sk, DCCP_BUG("Illegal %s state TERM, sk=%p", dccp_role(sk), sk);
hcrx->ccid3hcrx_state);
return; return;
} }
@ -1084,10 +1064,8 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
/* Scaling up by 1000000 as fixed decimal */ /* Scaling up by 1000000 as fixed decimal */
if (i_mean != 0) if (i_mean != 0)
hcrx->ccid3hcrx_p = 1000000 / i_mean; hcrx->ccid3hcrx_p = 1000000 / i_mean;
} else { } else
printk(KERN_CRIT "%s: empty loss hist\n",__FUNCTION__); DCCP_BUG("empty loss history");
dump_stack();
}
if (hcrx->ccid3hcrx_p > p_prev) { if (hcrx->ccid3hcrx_p > p_prev) {
ccid3_hc_rx_send_feedback(sk); ccid3_hc_rx_send_feedback(sk);

6
net/dccp/ccids/lib/loss_interval.c
View file

@ -13,7 +13,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <net/sock.h> #include <net/sock.h>
#include "../../dccp.h"
#include "loss_interval.h" #include "loss_interval.h"
struct dccp_li_hist *dccp_li_hist_new(const char *name) struct dccp_li_hist *dccp_li_hist_new(const char *name)
@ -109,7 +109,7 @@ u32 dccp_li_hist_calc_i_mean(struct list_head *list)
i_tot = max(i_tot0, i_tot1); i_tot = max(i_tot0, i_tot1);
if (!w_tot) { if (!w_tot) {
LIMIT_NETDEBUG(KERN_WARNING "%s: w_tot = 0\n", __FUNCTION__); DCCP_WARN("w_tot = 0\n");
return 1; return 1;
} }
@ -128,7 +128,7 @@ int dccp_li_hist_interval_new(struct dccp_li_hist *hist,
entry = dccp_li_hist_entry_new(hist, SLAB_ATOMIC); entry = dccp_li_hist_entry_new(hist, SLAB_ATOMIC);
if (entry == NULL) { if (entry == NULL) {
dccp_li_hist_purge(hist, list); dccp_li_hist_purge(hist, list);
dump_stack(); DCCP_BUG("loss interval list entry is NULL");
return 0; return 0;
} }
entry->dccplih_interval = ~0; entry->dccplih_interval = ~0;

7
net/dccp/ccids/lib/tfrc_equation.c
View file

@ -13,9 +13,8 @@
*/ */
#include <linux/module.h> #include <linux/module.h>
#include <asm/div64.h> #include <asm/div64.h>
#include "../../dccp.h"
#include "tfrc.h" #include "tfrc.h"
#define TFRC_CALC_X_ARRSIZE 500 #define TFRC_CALC_X_ARRSIZE 500
@ -588,8 +587,10 @@ u32 tfrc_calc_x(u16 s, u32 R, u32 p)
/* p should be 0 unless there is a bug in my code */ /* p should be 0 unless there is a bug in my code */
index = 0; index = 0;
if (R == 0) if (R == 0) {
DCCP_WARN("RTT==0, setting to 1\n");
R = 1; /* RTT can't be zero or else divide by zero */ R = 1; /* RTT can't be zero or else divide by zero */
}
BUG_ON(index >= TFRC_CALC_X_ARRSIZE); BUG_ON(index >= TFRC_CALC_X_ARRSIZE);

17
net/dccp/dccp.h
View file

@ -18,12 +18,17 @@
#include <net/tcp.h> #include <net/tcp.h>
#include "ackvec.h" #include "ackvec.h"
#define DCCP_CRIT(fmt, a...) LIMIT_NETDEBUG(KERN_CRIT fmt " at %s:%d/%s()\n", \ /*
##a, __FILE__, __LINE__, __FUNCTION__) * DCCP - specific warning and debugging macros.
#define DCCP_BUG(fmt, a...) do { DCCP_CRIT(fmt, ##a); dump_stack(); } while (0) */
#define DCCP_BUG_ON(cond) do { if (unlikely((cond) == 0)) \ #define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \
DCCP_BUG("BUG: condition \"%s\" fails",\ __FUNCTION__, ##a)
__stringify((cond))); \ #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
__FILE__, __LINE__, __FUNCTION__)
#define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
#define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \
DCCP_BUG("\"%s\" holds (exception!)", \
__stringify(cond)); \
} while (0) } while (0)
#ifdef MODULE #ifdef MODULE

11
net/dccp/feat.c
View file

@ -25,11 +25,11 @@ int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
dccp_feat_debug(type, feature, *val); dccp_feat_debug(type, feature, *val);
if (!dccp_feat_is_valid_type(type)) { if (!dccp_feat_is_valid_type(type)) {
pr_info("option type %d invalid in negotiation\n", type); DCCP_WARN("option type %d invalid in negotiation\n", type);
return 1; return 1;
} }
if (!dccp_feat_is_valid_length(type, feature, len)) { if (!dccp_feat_is_valid_length(type, feature, len)) {
pr_info("invalid length %d\n", len); DCCP_WARN("invalid length %d\n", len);
return 1; return 1;
} }
/* XXX add further sanity checks */ /* XXX add further sanity checks */
@ -169,7 +169,8 @@ static int dccp_feat_reconcile(struct sock *sk, struct dccp_opt_pend *opt,
break; break;
default: default:
WARN_ON(1); /* XXX implement res */ DCCP_BUG("Fell through, feat=%d", opt->dccpop_feat);
/* XXX implement res */
return -EFAULT; return -EFAULT;
} }
@ -328,7 +329,7 @@ static void dccp_feat_empty_confirm(struct dccp_minisock *dmsk,
switch (type) { switch (type) {
case DCCPO_CHANGE_L: opt->dccpop_type = DCCPO_CONFIRM_R; break; case DCCPO_CHANGE_L: opt->dccpop_type = DCCPO_CONFIRM_R; break;
case DCCPO_CHANGE_R: opt->dccpop_type = DCCPO_CONFIRM_L; break; case DCCPO_CHANGE_R: opt->dccpop_type = DCCPO_CONFIRM_L; break;
default: pr_info("invalid type %d\n", type); return; default: DCCP_WARN("invalid type %d\n", type); return;
} }
opt->dccpop_feat = feature; opt->dccpop_feat = feature;
@ -426,7 +427,7 @@ int dccp_feat_confirm_recv(struct sock *sk, u8 type, u8 feature,
switch (type) { switch (type) {
case DCCPO_CONFIRM_L: t = DCCPO_CHANGE_R; break; case DCCPO_CONFIRM_L: t = DCCPO_CHANGE_R; break;
case DCCPO_CONFIRM_R: t = DCCPO_CHANGE_L; break; case DCCPO_CONFIRM_R: t = DCCPO_CHANGE_L; break;
default: pr_info("invalid type %d\n", type); default: DCCP_WARN("invalid type %d\n", type);
return 1; return 1;
} }

11
net/dccp/input.c
View file

@ -128,20 +128,17 @@ static int dccp_check_seqno(struct sock *sk, struct sk_buff *skb)
DCCP_PKT_WITHOUT_ACK_SEQ)) DCCP_PKT_WITHOUT_ACK_SEQ))
dp->dccps_gar = DCCP_SKB_CB(skb)->dccpd_ack_seq; dp->dccps_gar = DCCP_SKB_CB(skb)->dccpd_ack_seq;
} else { } else {
LIMIT_NETDEBUG(KERN_WARNING "DCCP: Step 6 failed for %s packet, " DCCP_WARN("DCCP: Step 6 failed for %s packet, "
"(LSWL(%llu) <= P.seqno(%llu) <= S.SWH(%llu)) and " "(LSWL(%llu) <= P.seqno(%llu) <= S.SWH(%llu)) and "
"(P.ackno %s or LAWL(%llu) <= P.ackno(%llu) <= S.AWH(%llu), " "(P.ackno %s or LAWL(%llu) <= P.ackno(%llu) <= S.AWH(%llu), "
"sending SYNC...\n", "sending SYNC...\n", dccp_packet_name(dh->dccph_type),
dccp_packet_name(dh->dccph_type),
(unsigned long long) lswl, (unsigned long long) lswl,
(unsigned long long) (unsigned long long) DCCP_SKB_CB(skb)->dccpd_seq,
DCCP_SKB_CB(skb)->dccpd_seq,
(unsigned long long) dp->dccps_swh, (unsigned long long) dp->dccps_swh,
(DCCP_SKB_CB(skb)->dccpd_ack_seq == (DCCP_SKB_CB(skb)->dccpd_ack_seq ==
DCCP_PKT_WITHOUT_ACK_SEQ) ? "doesn't exist" : "exists", DCCP_PKT_WITHOUT_ACK_SEQ) ? "doesn't exist" : "exists",
(unsigned long long) lawl, (unsigned long long) lawl,
(unsigned long long) (unsigned long long) DCCP_SKB_CB(skb)->dccpd_ack_seq,
DCCP_SKB_CB(skb)->dccpd_ack_seq,
(unsigned long long) dp->dccps_awh); (unsigned long long) dp->dccps_awh);
dccp_send_sync(sk, DCCP_SKB_CB(skb)->dccpd_seq, DCCP_PKT_SYNC); dccp_send_sync(sk, DCCP_SKB_CB(skb)->dccpd_seq, DCCP_PKT_SYNC);
return -1; return -1;

20
net/dccp/ipv4.c
View file

@ -747,7 +747,7 @@ int dccp_invalid_packet(struct sk_buff *skb)
/* If the packet is shorter than 12 bytes, drop packet and return */ /* If the packet is shorter than 12 bytes, drop packet and return */
if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) { if (!pskb_may_pull(skb, sizeof(struct dccp_hdr))) {
LIMIT_NETDEBUG(KERN_WARNING "DCCP: pskb_may_pull failed\n"); DCCP_WARN("pskb_may_pull failed\n");
return 1; return 1;
} }
@ -755,7 +755,7 @@ int dccp_invalid_packet(struct sk_buff *skb)
/* If P.type is not understood, drop packet and return */ /* If P.type is not understood, drop packet and return */
if (dh->dccph_type >= DCCP_PKT_INVALID) { if (dh->dccph_type >= DCCP_PKT_INVALID) {
LIMIT_NETDEBUG(KERN_WARNING "DCCP: invalid packet type\n"); DCCP_WARN("invalid packet type\n");
return 1; return 1;
} }
@ -763,16 +763,14 @@ int dccp_invalid_packet(struct sk_buff *skb)
* If P.Data Offset is too small for packet type, drop packet and return * If P.Data Offset is too small for packet type, drop packet and return
*/ */
if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) { if (dh->dccph_doff < dccp_hdr_len(skb) / sizeof(u32)) {
LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " DCCP_WARN("P.Data Offset(%u) too small\n", dh->dccph_doff);
"too small\n", dh->dccph_doff);
return 1; return 1;
} }
/* /*
* If P.Data Offset is too too large for packet, drop packet and return * If P.Data Offset is too too large for packet, drop packet and return
*/ */
if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) { if (!pskb_may_pull(skb, dh->dccph_doff * sizeof(u32))) {
LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.Data Offset(%u) " DCCP_WARN("P.Data Offset(%u) too large\n", dh->dccph_doff);
"too large\n", dh->dccph_doff);
return 1; return 1;
} }
@ -782,8 +780,7 @@ int dccp_invalid_packet(struct sk_buff *skb)
*/ */
if (dh->dccph_type >= DCCP_PKT_DATA && if (dh->dccph_type >= DCCP_PKT_DATA &&
dh->dccph_type <= DCCP_PKT_DATAACK && dh->dccph_x == 0) { dh->dccph_type <= DCCP_PKT_DATAACK && dh->dccph_x == 0) {
LIMIT_NETDEBUG(KERN_WARNING "DCCP: P.type (%s) not Data||Ack||" DCCP_WARN("P.type (%s) not Data || [Data]Ack, while P.X == 0\n",
"DataAck, while P.X == 0\n",
dccp_packet_name(dh->dccph_type)); dccp_packet_name(dh->dccph_type));
return 1; return 1;
} }
@ -794,8 +791,7 @@ int dccp_invalid_packet(struct sk_buff *skb)
*/ */
cscov = dccp_csum_coverage(skb); cscov = dccp_csum_coverage(skb);
if (cscov > skb->len) { if (cscov > skb->len) {
LIMIT_NETDEBUG(KERN_WARNING DCCP_WARN("P.CsCov %u exceeds packet length %d\n",
"DCCP: P.CsCov %u exceeds packet length %d\n",
dh->dccph_cscov, skb->len); dh->dccph_cscov, skb->len);
return 1; return 1;
} }
@ -823,9 +819,7 @@ static int dccp_v4_rcv(struct sk_buff *skb)
/* Step 1: If header checksum is incorrect, drop packet and return */ /* Step 1: If header checksum is incorrect, drop packet and return */
if (dccp_v4_csum_finish(skb, skb->nh.iph->saddr, skb->nh.iph->daddr)) { if (dccp_v4_csum_finish(skb, skb->nh.iph->saddr, skb->nh.iph->daddr)) {
LIMIT_NETDEBUG(KERN_WARNING DCCP_WARN("dropped packet with invalid checksum\n");
"%s: dropped packet with invalid checksum\n",
__FUNCTION__);
goto discard_it; goto discard_it;
} }

4
net/dccp/ipv6.c
View file

@ -828,9 +828,7 @@ static int dccp_v6_rcv(struct sk_buff **pskb)
/* Step 1: If header checksum is incorrect, drop packet and return. */ /* Step 1: If header checksum is incorrect, drop packet and return. */
if (dccp_v6_csum_finish(skb, &skb->nh.ipv6h->saddr, if (dccp_v6_csum_finish(skb, &skb->nh.ipv6h->saddr,
&skb->nh.ipv6h->daddr)) { &skb->nh.ipv6h->daddr)) {
LIMIT_NETDEBUG(KERN_WARNING DCCP_WARN("dropped packet with invalid checksum\n");
"%s: dropped packet with invalid checksum\n",
__FUNCTION__);
goto discard_it; goto discard_it;
} }

7
net/dccp/minisocks.c
View file

@ -84,8 +84,7 @@ void dccp_time_wait(struct sock *sk, int state, int timeo)
* socket up. We've got bigger problems than * socket up. We've got bigger problems than
* non-graceful socket closings. * non-graceful socket closings.
*/ */
LIMIT_NETDEBUG(KERN_INFO "DCCP: time wait bucket " DCCP_WARN("time wait bucket table overflow\n");
"table overflow\n");
} }
dccp_done(sk); dccp_done(sk);
@ -289,9 +288,7 @@ EXPORT_SYMBOL_GPL(dccp_child_process);
void dccp_reqsk_send_ack(struct sk_buff *skb, struct request_sock *rsk) void dccp_reqsk_send_ack(struct sk_buff *skb, struct request_sock *rsk)
{ {
pr_info(KERN_WARNING "DCCP: ACK packets are never sent in " DCCP_BUG("DCCP-ACK packets are never sent in LISTEN/RESPOND state");
"LISTEN/RESPOND state\n");
dump_stack();
} }
EXPORT_SYMBOL_GPL(dccp_reqsk_send_ack); EXPORT_SYMBOL_GPL(dccp_reqsk_send_ack);

10
net/dccp/options.c
View file

@ -238,9 +238,8 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
} }
break; break;
default: default:
pr_info("DCCP(%p): option %d(len=%d) not " DCCP_CRIT("DCCP(%p): option %d(len=%d) not "
"implemented, ignoring\n", "implemented, ignoring", sk, opt, len);
sk, opt, len);
break; break;
} }
@ -257,7 +256,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
out_invalid_option: out_invalid_option:
DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT); DCCP_INC_STATS_BH(DCCP_MIB_INVALIDOPT);
DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR; DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_OPTION_ERROR;
pr_info("DCCP(%p): invalid option %d, len=%d\n", sk, opt, len); DCCP_WARN("DCCP(%p): invalid option %d, len=%d", sk, opt, len);
return -1; return -1;
} }
@ -447,8 +446,7 @@ static int dccp_insert_feat_opt(struct sk_buff *skb, u8 type, u8 feat,
u8 *to; u8 *to;
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) { if (DCCP_SKB_CB(skb)->dccpd_opt_len + len + 3 > DCCP_MAX_OPT_LEN) {
LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small" DCCP_WARN("packet too small for feature %d option!\n", feat);
" to insert feature %d option!\n", feat);
return -1; return -1;
} }

16
net/dccp/output.c
View file

@ -257,11 +257,8 @@ void dccp_write_xmit(struct sock *sk, int block)
err = dccp_wait_for_ccid(sk, skb, &timeo); err = dccp_wait_for_ccid(sk, skb, &timeo);
timeo = DCCP_XMIT_TIMEO; timeo = DCCP_XMIT_TIMEO;
} }
if (err) { if (err)
printk(KERN_CRIT "%s:err at dccp_wait_for_ccid" DCCP_BUG("err=%d after dccp_wait_for_ccid", err);
" %d\n", __FUNCTION__, err);
dump_stack();
}
} }
skb_dequeue(&sk->sk_write_queue); skb_dequeue(&sk->sk_write_queue);
@ -283,12 +280,9 @@ void dccp_write_xmit(struct sock *sk, int block)
err = dccp_transmit_skb(sk, skb); err = dccp_transmit_skb(sk, skb);
ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len); ccid_hc_tx_packet_sent(dp->dccps_hc_tx_ccid, sk, 0, len);
if (err) { if (err)
printk(KERN_CRIT "%s:err from " DCCP_BUG("err=%d after ccid_hc_tx_packet_sent",
"ccid_hc_tx_packet_sent %d\n", err);
__FUNCTION__, err);
dump_stack();
}
} else } else
kfree(skb); kfree(skb);
} }

5
net/dccp/proto.c
View file

@ -1033,8 +1033,7 @@ static int __init dccp_init(void)
} while (!dccp_hashinfo.ehash && --ehash_order > 0); } while (!dccp_hashinfo.ehash && --ehash_order > 0);
if (!dccp_hashinfo.ehash) { if (!dccp_hashinfo.ehash) {
printk(KERN_CRIT "Failed to allocate DCCP " DCCP_CRIT("Failed to allocate DCCP established hash table");
"established hash table\n");
goto out_free_bind_bucket_cachep; goto out_free_bind_bucket_cachep;
} }
@ -1056,7 +1055,7 @@ static int __init dccp_init(void)
} while (!dccp_hashinfo.bhash && --bhash_order >= 0); } while (!dccp_hashinfo.bhash && --bhash_order >= 0);
if (!dccp_hashinfo.bhash) { if (!dccp_hashinfo.bhash) {
printk(KERN_CRIT "Failed to allocate DCCP bind hash table\n"); DCCP_CRIT("Failed to allocate DCCP bind hash table");
goto out_free_dccp_ehash; goto out_free_dccp_ehash;
} }