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kernel-49/net/bridge/br_stp_bpdu_log.c
Sergey Korolev 5b4453b74e br_stp_bpdu_log.c: fix a compilation warning 
In file included from ./include/linux/printk.h:6,
                 from ./include/linux/kernel.h:13,
                 from ./include/linux/skbuff.h:17,
                 from net/bridge/br_stp_bpdu_log.c:12:
net/bridge/br_stp_bpdu_log.c: In function 'stp_print_mstp_bpdu':
./include/linux/kern_levels.h:4:18: warning: format '%u' expects argument of
type 'unsigned int', but argument 4 has type 'size_t' {aka 'long unsigned int'} [-Wformat=]
    4 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
      |                  ^~~~~~
./include/linux/kern_levels.h:23:19: note: in expansion of macro 'KERN_SOH'
   23 | #define KERN_CONT KERN_SOH "c"
      |                   ^~~~~~~~
./include/linux/printk.h:291:9: note: in expansion of macro 'KERN_CONT'
  291 |  printk(KERN_CONT fmt, ##__VA_ARGS__)
      |         ^~~~~~~~~
net/bridge/br_stp_bpdu_log.c:281:2: note: in expansion of macro 'pr_cont'
  281 |  pr_cont(", CIST bridge-id %s.%04x, length %u\n",
      |  ^~~~~~~
2021-05-21 18:03:17 +03:00

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/*
* Copyright (c) 2000 Lennert Buytenhek
*
* This software may be distributed either under the terms of the
* BSD-style license that accompanies tcpdump or the GNU General
* Public License
*
* Format and print IEEE 802.1d spanning tree protocol packets.
* Contributed by Lennert Buytenhek <buytenh@gnu.org>
*/
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#include "br_private.h"
#include "br_private_stp.h"
#if !IS_ENABLED(CONFIG_VLAN_8021Q)
#error Kernel must contain support of VLAN 8021Q
#endif /* CONFIG_VLAN_8021Q */
#define STP_PRINT_BUF_SIZE 64
#define RSTP_EXTRACT_PORT_ROLE(x) (((x) & 0x0C) >> 2)
/* STP timers are expressed in multiples of 1/256th second */
#define STP_TIME_BASE 256
#define STP_BPDU_MSTP_MIN_LEN 102
struct stp_bpdu {
u8 protocol_id[2];
u8 protocol_version;
u8 bpdu_type;
u8 flags;
u8 root_id[8];
u8 root_path_cost[4];
u8 bridge_id[8];
u8 port_id[2];
u8 message_age[2];
u8 max_age[2];
u8 hello_time[2];
u8 forward_delay[2];
u8 v1_length;
};
#define STP_PROTO_REGULAR 0x00
#define STP_PROTO_RAPID 0x02
#define STP_PROTO_MSTP 0x03
struct tok {
int v; /* value */
const char *s; /* string */
};
static const struct tok stp_proto_values[] = {
{ STP_PROTO_REGULAR, "802.1d" },
{ STP_PROTO_RAPID, "802.1w" },
{ STP_PROTO_MSTP, "802.1s" },
{ 0, NULL}
};
#define STP_BPDU_TYPE_CONFIG 0x00
#define STP_BPDU_TYPE_RSTP 0x02
#define STP_BPDU_TYPE_TOPO_CHANGE 0x80
static const struct tok stp_bpdu_flag_values[] = {
{ 0x01, "Topology change" },
{ 0x02, "Proposal" },
{ 0x10, "Learn" },
{ 0x20, "Forward" },
{ 0x40, "Agreement" },
{ 0x80, "Topology change ACK" },
{ 0, NULL}
};
static const struct tok stp_bpdu_type_values[] = {
{ STP_BPDU_TYPE_CONFIG, "Config" },
{ STP_BPDU_TYPE_RSTP, "Rapid STP" },
{ STP_BPDU_TYPE_TOPO_CHANGE, "Topology Change" },
{ 0, NULL}
};
static const struct tok rstp_obj_port_role_values[] = {
{ 0x00, "Unknown" },
{ 0x01, "Alternate" },
{ 0x02, "Root" },
{ 0x03, "Designated" },
{ 0, NULL}
};
static char *
bittok2str(const struct tok *lp, const char *fmt, int v,
char *buf, size_t buflen)
{
int blen = 0;
int rotbit; /* this is the bit we rotate through all bitpositions */
int tokval;
while (lp->s != NULL && lp != NULL) {
tokval = lp->v; /* load our first value */
rotbit = 1;
while (rotbit != 0) {
/*
* lets AND the rotating bit with our token value
* and see if we have got a match
*/
if (tokval == (v & rotbit)) {
/* ok we have found something */
blen += snprintf(buf + blen, buflen - blen,
"%s, ", lp->s);
break;
}
/* no match - lets shift and try again */
rotbit = rotbit << 1;
}
lp++;
}
if (blen != 0) {
/* did we find anything
* yep, set the the trailing zero 2 bytes before
* to eliminate the last comma & whitespace
*/
buf[blen - 2] = '\0';
return buf;
}
/* bummer - lets print the "unknown" message
* as advised in the fmt string if we got one
*/
if (fmt == NULL)
fmt = "#%d";
(void)snprintf(buf, buflen, fmt, v);
return buf;
}
/*
* Convert a token value to a string; use "fmt" if not found.
*/
static const char *
tok2strbuf(const struct tok *lp, const char *fmt,
int v, char *buf, size_t bufsize)
{
if (lp != NULL) {
while (lp->s != NULL) {
if (lp->v == v)
return lp->s;
++lp;
}
}
if (fmt == NULL)
fmt = "#%d";
(void)snprintf(buf, bufsize, fmt, v);
return (const char *)buf;
}
static char *
stp_print_id(const u8 *p, char *buf, const size_t buflen)
{
snprintf(buf, buflen,
"%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
return buf;
}
static void
stp_print_config_bpdu(const struct stp_bpdu *bpdu, size_t length,
char *buf, size_t buflen)
{
pr_cont(", Flags [%s]",
bittok2str(stp_bpdu_flag_values,
"none", bpdu->flags,
buf, buflen));
pr_cont(", bridge-id %s.%04x, length %zu\n",
stp_print_id((const u8 *)&bpdu->bridge_id, buf, buflen),
get_unaligned_be16(&bpdu->port_id),
length);
pr_info(" +-> message-age %u ms, max-age %u ms"
", hello-time %u ms, forwarding-delay %u ms\n",
1000u * get_unaligned_be16(&bpdu->message_age) / STP_TIME_BASE,
1000u * get_unaligned_be16(&bpdu->max_age) / STP_TIME_BASE,
1000u * get_unaligned_be16(&bpdu->hello_time) / STP_TIME_BASE,
1000u * get_unaligned_be16(&bpdu->forward_delay) / STP_TIME_BASE);
pr_info(" +-> root-id %s, root-pathcost %u",
stp_print_id((const u8 *)&bpdu->root_id, buf, buflen),
get_unaligned_be32(&bpdu->root_path_cost));
/* Port role is only valid for 802.1w */
if (bpdu->protocol_version == STP_PROTO_RAPID) {
pr_cont(", port-role %s",
tok2strbuf(rstp_obj_port_role_values, "Unknown",
RSTP_EXTRACT_PORT_ROLE(bpdu->flags),
buf, buflen));
}
}
/*
* MSTP packet format
* Ref. IEEE 802.1Q 2003 Ed. Section 14
*
* MSTP BPDU
*
* 2 - bytes Protocol Id
* 1 - byte Protocol Ver.
* 1 - byte BPDU tye
* 1 - byte Flags
* 8 - bytes CIST Root Identifier
* 4 - bytes CIST External Path Cost
* 8 - bytes CIST Regional Root Identifier
* 2 - bytes CIST Port Identifier
* 2 - bytes Message Age
* 2 - bytes Max age
* 2 - bytes Hello Time
* 2 - bytes Forward delay
* 1 - byte Version 1 length. Must be 0
* 2 - bytes Version 3 length
* 1 - byte Config Identifier
* 32 - bytes Config Name
* 2 - bytes Revision level
* 16 - bytes Config Digest [MD5]
* 4 - bytes CIST Internal Root Path Cost
* 8 - bytes CIST Bridge Identifier
* 1 - byte CIST Remaining Hops
* 16 - bytes MSTI information [Max 64 MSTI, each 16 bytes]
*
* MSTI Payload
*
* 1 - byte MSTI flag
* 8 - bytes MSTI Regional Root Identifier
* 4 - bytes MSTI Regional Path Cost
* 1 - byte MSTI Bridge Priority
* 1 - byte MSTI Port Priority
* 1 - byte MSTI Remaining Hops
*/
#define MST_BPDU_MSTI_LENGTH 16
#define MST_BPDU_CONFIG_INFO_LENGTH 64
/* Offsets of fields from the begginning for the packet */
#define MST_BPDU_VER3_LEN_OFFSET 36
#define MST_BPDU_CONFIG_NAME_OFFSET 39
#define MST_BPDU_CONFIG_DIGEST_OFFSET 73
#define MST_BPDU_CIST_INT_PATH_COST_OFFSET 89
#define MST_BPDU_CIST_BRIDGE_ID_OFFSET 93
#define MST_BPDU_CIST_REMAIN_HOPS_OFFSET 101
#define MST_BPDU_MSTI_OFFSET 102
/* Offsets within an MSTI */
#define MST_BPDU_MSTI_ROOT_PRIO_OFFSET 1
#define MST_BPDU_MSTI_ROOT_PATH_COST_OFFSET 9
#define MST_BPDU_MSTI_BRIDGE_PRIO_OFFSET 13
#define MST_BPDU_MSTI_PORT_PRIO_OFFSET 14
#define MST_BPDU_MSTI_REMAIN_HOPS_OFFSET 15
static void
stp_print_mstp_bpdu(const struct stp_bpdu *bpdu, size_t length,
char *buf, size_t buflen)
{
const u8 *ptr = (const u8 *)bpdu;
u16 v3len;
u16 len;
u16 msti;
u16 offset;
pr_cont(", CIST Flags [%s]",
bittok2str(stp_bpdu_flag_values, "none", bpdu->flags,
buf, buflen));
pr_cont(", CIST bridge-id %s.%04x, length %zu\n",
stp_print_id(ptr + MST_BPDU_CIST_BRIDGE_ID_OFFSET, buf, buflen),
get_unaligned_be16(&bpdu->port_id), length);
pr_info(" +-> message-age %u ms, max-age %u ms"
", hello-time %u ms, forwarding-delay %u ms\n",
1000u * get_unaligned_be16(&bpdu->message_age) / STP_TIME_BASE,
1000u * get_unaligned_be16(&bpdu->max_age) / STP_TIME_BASE,
1000u * get_unaligned_be16(&bpdu->hello_time) / STP_TIME_BASE,
1000u * get_unaligned_be16(&bpdu->forward_delay) / STP_TIME_BASE);
pr_info(" +-> CIST root-id %s, ext-pathcost %u int-pathcost %u",
stp_print_id((const u8 *)&bpdu->root_id, buf, buflen),
get_unaligned_be32(&bpdu->root_path_cost),
get_unaligned_be32(ptr + MST_BPDU_CIST_INT_PATH_COST_OFFSET));
pr_cont(", port-role %s\n",
tok2strbuf(rstp_obj_port_role_values, "Unknown",
RSTP_EXTRACT_PORT_ROLE(bpdu->flags),
buf, buflen));
pr_info(" +-> CIST regional-root-id %s",
stp_print_id((const u8 *)&bpdu->bridge_id, buf, buflen));
pr_cont(" +-> MSTP Configuration Name %s, revision %u, digest %08x%08x%08x%08x\n",
ptr + MST_BPDU_CONFIG_NAME_OFFSET,
get_unaligned_be16(ptr + MST_BPDU_CONFIG_NAME_OFFSET + 32),
get_unaligned_be32(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET),
get_unaligned_be32(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET + 4),
get_unaligned_be32(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET + 8),
get_unaligned_be32(ptr + MST_BPDU_CONFIG_DIGEST_OFFSET + 12));
pr_info(" +-> CIST remaining-hops %d",
ptr[MST_BPDU_CIST_REMAIN_HOPS_OFFSET]);
/* Dump all MSTI's */
v3len = get_unaligned_be16(ptr + MST_BPDU_VER3_LEN_OFFSET);
if (v3len > MST_BPDU_CONFIG_INFO_LENGTH) {
len = v3len - MST_BPDU_CONFIG_INFO_LENGTH;
offset = MST_BPDU_MSTI_OFFSET;
while (len >= MST_BPDU_MSTI_LENGTH) {
msti = get_unaligned_be16(ptr + offset +
MST_BPDU_MSTI_ROOT_PRIO_OFFSET);
msti = msti & 0x0FFF;
pr_cont("\n +-+-> MSTI %d, Flags [%s], port-role %s",
msti,
bittok2str(stp_bpdu_flag_values, "none",
ptr[offset],
buf, buflen),
tok2strbuf(rstp_obj_port_role_values,
"Unknown",
RSTP_EXTRACT_PORT_ROLE(ptr[offset]),
buf, buflen));
pr_cont("\n +-+-> MSTI regional-root-id %s, pathcost %u",
stp_print_id(ptr + offset +
MST_BPDU_MSTI_ROOT_PRIO_OFFSET,
buf, buflen),
get_unaligned_be32(ptr + offset +
MST_BPDU_MSTI_ROOT_PATH_COST_OFFSET));
pr_cont("\n +-+-> MSTI bridge-prio %d, port-prio %d, hops %d",
ptr[offset + MST_BPDU_MSTI_BRIDGE_PRIO_OFFSET] >> 4,
ptr[offset + MST_BPDU_MSTI_PORT_PRIO_OFFSET] >> 4,
ptr[offset + MST_BPDU_MSTI_REMAIN_HOPS_OFFSET]);
len -= MST_BPDU_MSTI_LENGTH;
offset += MST_BPDU_MSTI_LENGTH;
}
}
}
/*
* Print 802.1d / 802.1w / 802.1q (mstp) packets.
*/
static void
br_stp_bdpu_print(struct net_bridge *br, struct net_device *dev,
struct sk_buff *skb, const bool send)
{
char buf[STP_PRINT_BUF_SIZE];
const struct stp_bpdu *bpdu;
u16 mstp_len;
if (send)
pr_info("[%s -> %s] Send BDPU from %pM",
br->dev->name, dev->name,
dev->dev_addr);
else
pr_info("[%s <- %s] Recv BDPU from %pM",
br->dev->name, dev->name,
&eth_hdr(skb)->h_source);
if (is_vlan_dev(dev))
pr_cont(", VLAN %u\n", vlan_dev_vlan_id(dev));
else
pr_cont("\n");
/* Minimum STP Frame size. */
if (skb->len < 4)
goto trunc;
bpdu = (struct stp_bpdu *)skb->data;
if (get_unaligned_be16(&bpdu->protocol_id)) {
pr_info(" +-> unknown STP version, length %u", skb->len);
goto flush;
}
pr_info(" +-> STP %s",
tok2strbuf(stp_proto_values,
"Unknown STP protocol (0x%02x)",
bpdu->protocol_version,
buf, sizeof(buf)));
switch (bpdu->protocol_version) {
case STP_PROTO_REGULAR:
case STP_PROTO_RAPID:
case STP_PROTO_MSTP:
break;
default:
goto cleanup;
}
pr_cont(", %s",
tok2strbuf(stp_bpdu_type_values,
"Unknown BPDU Type (0x%02x)",
bpdu->bpdu_type,
buf, sizeof(buf)));
switch (bpdu->bpdu_type) {
case STP_BPDU_TYPE_CONFIG:
if (skb->len < sizeof(struct stp_bpdu) - 1)
goto trunc;
stp_print_config_bpdu(bpdu, skb->len, buf, sizeof(buf));
break;
case STP_BPDU_TYPE_RSTP:
if (bpdu->protocol_version == STP_PROTO_RAPID) {
if (skb->len < sizeof(struct stp_bpdu))
goto trunc;
stp_print_config_bpdu(bpdu, skb->len,
buf, sizeof(buf));
} else
if (bpdu->protocol_version == STP_PROTO_MSTP) {
if (skb->len < STP_BPDU_MSTP_MIN_LEN)
goto trunc;
if (bpdu->v1_length != 0)
/* FIX ME: Emit a message here ? */
goto trunc;
/* Validate v3 length */
mstp_len = get_unaligned_be16(skb->data +
MST_BPDU_VER3_LEN_OFFSET);
mstp_len += 2; /* length encoding itself is 2 bytes */
if (skb->len < (sizeof(struct stp_bpdu) + mstp_len))
goto trunc;
stp_print_mstp_bpdu(bpdu, skb->len,
buf, sizeof(buf));
}
break;
case STP_BPDU_TYPE_TOPO_CHANGE:
/* always empty message - just break out */
break;
default:
break;
}
flush:
pr_cont("\n");
return;
trunc:
pr_cont("\n +-> TRUNCATED\n");
cleanup:
return;
}
void
br_stp_bdpu_recv_print(struct net_bridge *br,
struct net_device *dev, struct sk_buff *skb)
{
br_stp_bdpu_print(br, dev, skb, false);
}
void
br_stp_bdpu_send_print(struct net_bridge *br,
struct net_device *dev, struct sk_buff *skb)
{
br_stp_bdpu_print(br, dev, skb, true);
}
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