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* Add the abilify to lock/unlock given table from changes.

Browse Source 
Example:

# ipfw table si lock
# ipfw table si info
+++ table(si), set(0) +++
 kindex: 0, type: cidr, locked
 valtype: number, references: 0
 algorithm: cidr:radix
 items: 0, size: 288
# ipfw table si add 4.5.6.7
ignored: 4.5.6.7/32 0
ipfw: Adding record failed: table is locked
# ipfw table si unlock
# ipfw table si add 4.5.6.7
added: 4.5.6.7/32 0
# ipfw table si lock
# ipfw table si delete 4.5.6.7
ignored: 4.5.6.7/32 0
ipfw: Deleting record failed: table is locked
# ipfw table si unlock
# ipfw table si delete 4.5.6.7
deleted: 4.5.6.7/32 0
This commit is contained in:
Alexander V. Chernikov 2014-08-11 18:09:37 +00:00
parent 3a845e1076
commit 4f43138ade
4 changed files with 62 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sbin/ipfw/ipfw2.h
View File

@ -225,6 +225,8 @@ enum tokens {
TOK_TALIST,
TOK_FTYPE,
TOK_ATOMIC,
TOK_LOCK,
TOK_UNLOCK,
};
/*
* the following macro returns an error message if we run out of

42
sbin/ipfw/tables.c
View File

@ -59,6 +59,7 @@ static int table_do_swap(ipfw_obj_header *oh, char *second);
static void table_create(ipfw_obj_header *oh, int ac, char *av[]);
static void table_modify(ipfw_obj_header *oh, int ac, char *av[]);
static void table_lookup(ipfw_obj_header *oh, int ac, char *av[]);
static void table_lock(ipfw_obj_header *oh, int lock);
static int table_swap(ipfw_obj_header *oh, char *second);
static int table_get_info(ipfw_obj_header *oh, ipfw_xtable_info *i);
static int table_show_info(ipfw_xtable_info *i, void *arg);
@ -115,6 +116,8 @@ static struct _s_x tablecmds[] = {
{ "list", TOK_LIST },
{ "lookup", TOK_LOOKUP },
{ "atomic", TOK_ATOMIC },
{ "lock", TOK_LOCK },
{ "unlock", TOK_UNLOCK },
{ NULL, 0 }
};
@ -240,6 +243,10 @@ ipfw_table_handler(int ac, char *av[])
NEED1("second table name required");
table_swap(&oh, *av);
break;
case TOK_LOCK:
case TOK_UNLOCK:
table_lock(&oh, (tcmd == TOK_LOCK));
break;
case TOK_DETAIL:
case TOK_INFO:
arg = (tcmd == TOK_DETAIL) ? (void *)1 : NULL;
@ -297,6 +304,7 @@ static struct _s_x tablenewcmds[] = {
{ "valtype", TOK_VALTYPE },
{ "algo", TOK_ALGO },
{ "limit", TOK_LIMIT },
{ "locked", TOK_LOCK },
{ NULL, 0 }
};
@ -440,6 +448,9 @@ table_create(ipfw_obj_header *oh, int ac, char *av[])
strlcpy(xi.algoname, *av, sizeof(xi.algoname));
ac--; av++;
break;
case TOK_LOCK:
xi.flags |= IPFW_TGFLAGS_LOCKED;
break;
}
}
@ -485,10 +496,6 @@ table_modify(ipfw_obj_header *oh, int ac, char *av[])
sz = sizeof(tbuf);
memset(&xi, 0, sizeof(xi));
/* Set some defaults to preserve compability */
xi.type = IPFW_TABLE_CIDR;
xi.vtype = IPFW_VTYPE_U32;
while (ac > 0) {
if ((tcmd = match_token(tablenewcmds, *av)) == -1)
errx(EX_USAGE, "unknown option: %s", *av);
@ -542,6 +549,25 @@ table_do_modify(ipfw_obj_header *oh, ipfw_xtable_info *i)
return (error);
}
/*
* Locks or unlocks given table
*/
static void
table_lock(ipfw_obj_header *oh, int lock)
{
ipfw_xtable_info xi;
int error;
memset(&xi, 0, sizeof(xi));
xi.mflags |= IPFW_TMFLAGS_LOCK;
xi.flags |= (lock != 0) ? IPFW_TGFLAGS_LOCKED : 0;
if ((error = table_do_modify(oh, &xi)) != 0)
err(EX_OSERR, "Table %s failed", lock != 0 ? "lock" : "unlock");
}
/*
* Destroys given table specified by @oh->ntlv.
* Returns 0 on success.
@ -713,7 +739,10 @@ table_show_info(ipfw_xtable_info *i, void *arg)
snprintf(tvtype, sizeof(tvtype), "%s", vtype);
printf("--- table(%s), set(%u) ---\n", i->tablename, i->set);
printf(" kindex: %d, type: %s\n", i->kidx, ttype);
if ((i->flags & IPFW_TGFLAGS_LOCKED) != 0)
printf(" kindex: %d, type: %s, locked\n", i->kidx, ttype);
else
printf(" kindex: %d, type: %s\n", i->kidx, ttype);
printf(" valtype: %s, references: %u\n", tvtype, i->refcnt);
printf(" algorithm: %s\n", i->algoname);
printf(" items: %u, size: %u\n", i->count, i->size);
@ -1007,6 +1036,9 @@ table_modify_record(ipfw_obj_header *oh, int ac, char *av[], int add,
case ENOENT:
etxt = "record not found";
break;
case EACCES:
etxt = "table is locked";
break;
default:
etxt = strerror(error);
}

11
sys/netinet/ip_fw.h
View File

@ -866,7 +866,7 @@ typedef struct _ipfw_xtable_info {
uint8_t vtype; /* value type (u32) */
uint8_t vftype; /* value format type (ip,number)*/
uint16_t mflags; /* modification flags */
uint16_t spare;
uint16_t flags; /* generic table flags */
uint32_t set; /* set table is in */
uint32_t kidx; /* kernel index */
uint32_t refcnt; /* number of references */
@ -877,13 +877,18 @@ typedef struct _ipfw_xtable_info {
char algoname[64]; /* algorithm name */
ipfw_ta_tinfo ta_info; /* additional algo stats */
} ipfw_xtable_info;
/* Generic table flags */
#define IPFW_TGFLAGS_LOCKED 0x01 /* Tables is locked from changes*/
/* Table type-specific flags */
#define IPFW_TFFLAG_SRCIP 0x01
#define IPFW_TFFLAG_DSTIP 0x02
#define IPFW_TFFLAG_SRCPORT 0x04
#define IPFW_TFFLAG_DSTPORT 0x08
#define IPFW_TFFLAG_PROTO 0x10
#define IPFW_TMFLAGS_FTYPE 0x01 /* Change ftype field */
#define IPFW_TMFLAGS_LIMIT 0x02 /* Change limit value */
/* Table modification flags */
#define IPFW_TMFLAGS_FTYPE 0x0001 /* Change ftype field */
#define IPFW_TMFLAGS_LIMIT 0x0002 /* Change limit value */
#define IPFW_TMFLAGS_LOCK 0x0004 /* Change table lock state */
typedef struct _ipfw_iface_info {
char ifname[64]; /* interface name */

16
sys/netpfil/ipfw/ip_fw_table.c
View File

@ -76,7 +76,7 @@ struct table_config {
uint8_t vtype; /* value type */
uint8_t vftype; /* value format type */
uint8_t tflags; /* type flags */
uint8_t spare0;
uint8_t locked; /* 1 if locked from changes */
uint32_t count; /* Number of records */
uint32_t limit; /* Max number of records */
uint8_t linked; /* 1 if already linked */
@ -210,6 +210,11 @@ add_table_entry(struct ip_fw_chain *ch, struct tid_info *ti,
return (EINVAL);
}
if (tc->locked != 0) {
IPFW_UH_WUNLOCK(ch);
return (EACCES);
}
/* Try to exit early on limit hit */
if ((error = check_table_limit(tc, tei)) != 0 && count == 1) {
IPFW_UH_WUNLOCK(ch);
@ -439,6 +444,11 @@ del_table_entry(struct ip_fw_chain *ch, struct tid_info *ti,
return (ESRCH);
}
if (tc->locked != 0) {
IPFW_UH_WUNLOCK(ch);
return (EACCES);
}
if (tc->no.type != ti->type) {
IPFW_UH_WUNLOCK(ch);
return (EINVAL);
@ -1616,6 +1626,8 @@ ipfw_modify_table(struct ip_fw_chain *ch, ip_fw3_opheader *op3,
tc->vftype = i->vftype;
if ((i->mflags & IPFW_TMFLAGS_LIMIT) != 0)
tc->limit = i->limit;
if ((i->mflags & IPFW_TMFLAGS_LOCK) != 0)
tc->locked = ((i->flags & IPFW_TGFLAGS_LOCKED) != 0);
IPFW_UH_WUNLOCK(ch);
return (0);
@ -1704,6 +1716,7 @@ create_table_internal(struct ip_fw_chain *ch, struct tid_info *ti,
tc->vftype = i->vftype;
tc->limit = i->limit;
tc->locked = (i->flags & IPFW_TGFLAGS_LOCKED) != 0;
IPFW_UH_WLOCK(ch);
@ -1792,6 +1805,7 @@ export_table_info(struct ip_fw_chain *ch, struct table_config *tc,
i->refcnt = tc->no.refcnt;
i->count = tc->count;
i->limit = tc->limit;
i->flags |= (tc->locked != 0) ? IPFW_TGFLAGS_LOCKED : 0;
i->size = tc->count * sizeof(ipfw_obj_tentry);
i->size += sizeof(ipfw_obj_header) + sizeof(ipfw_xtable_info);
strlcpy(i->tablename, tc->tablename, sizeof(i->tablename));