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Add ability to request listing and deleting only for dynamic states.

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This can be useful, when net.inet.ip.fw.dyn_keep_states is enabled, but
after rules reloading some state must be deleted. Added new flag '-D'
for such purpose.

Retire '-e' flag, since there can not be expired states in the meaning
that this flag historically had.

Also add "verbose" mode for listing of dynamic states, it can be enabled
with '-v' flag and adds additional information to states list. This can
be useful for debugging.

Obtained from:	Yandex LLC
MFC after:	2 months
Sponsored by:	Yandex LLC
This commit is contained in:
Andrey V. Elsukov 2018-12-04 16:12:43 +00:00
parent cefe3d67e2
commit d66f9c86fa
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=341472
7 changed files with 91 additions and 32 deletions
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9
sbin/ipfw/ipfw.8
View File

@ -1,7 +1,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd November 13, 2018
.Dd December 4, 2018
.Dt IPFW 8
.Os
.Sh NAME
@ -310,10 +310,9 @@ i.e., omitting the "ip from any to any" string
when this does not carry any additional information.
.It Fl d
When listing, show dynamic rules in addition to static ones.
.It Fl e
When listing and
.Fl d
is specified, also show expired dynamic rules.
.It Fl D
When listing, show only dynamic states.
When deleting, delete only dynamic states.
.It Fl f
Run without prompting for confirmation for commands that can cause problems if misused,
i.e.,

65
sbin/ipfw/ipfw2.c
View File

@ -2247,10 +2247,9 @@ show_dyn_state(struct cmdline_opts *co, struct format_opts *fo,
uint16_t rulenum;
char buf[INET6_ADDRSTRLEN];
if (!co->do_expired) {
if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
return;
}
if (d->expire == 0 && d->dyn_type != O_LIMIT_PARENT)
return;
bcopy(&d->rule, &rulenum, sizeof(rulenum));
bprintf(bp, "%05d", rulenum);
if (fo->pcwidth > 0 || fo->bcwidth > 0) {
@ -2292,6 +2291,33 @@ show_dyn_state(struct cmdline_opts *co, struct format_opts *fo,
if (d->kidx != 0)
bprintf(bp, " :%s", object_search_ctlv(fo->tstate,
d->kidx, IPFW_TLV_STATE_NAME));
#define BOTH_SYN (TH_SYN | (TH_SYN << 8))
#define BOTH_FIN (TH_FIN | (TH_FIN << 8))
if (co->verbose) {
bprintf(bp, " state 0x%08x%s", d->state,
d->state ? " ": ",");
if (d->state & IPFW_DYN_ORPHANED)
bprintf(bp, "ORPHANED,");
if ((d->state & BOTH_SYN) == BOTH_SYN)
bprintf(bp, "BOTH_SYN,");
else {
if (d->state & TH_SYN)
bprintf(bp, "F_SYN,");
if (d->state & (TH_SYN << 8))
bprintf(bp, "R_SYN,");
}
if ((d->state & BOTH_FIN) == BOTH_FIN)
bprintf(bp, "BOTH_FIN,");
else {
if (d->state & TH_FIN)
bprintf(bp, "F_FIN,");
if (d->state & (TH_FIN << 8))
bprintf(bp, "R_FIN,");
}
bprintf(bp, " f_ack 0x%x, r_ack 0x%x", d->ack_fwd,
d->ack_rev);
}
}
static int
@ -2695,7 +2721,8 @@ ipfw_list(int ac, char *av[], int show_counters)
cfg = NULL;
sfo.show_counters = show_counters;
sfo.show_time = co.do_time;
sfo.flags = IPFW_CFG_GET_STATIC;
if (co.do_dynamic != 2)
sfo.flags |= IPFW_CFG_GET_STATIC;
if (co.do_dynamic != 0)
sfo.flags |= IPFW_CFG_GET_STATES;
if ((sfo.show_counters | sfo.show_time) != 0)
@ -2740,17 +2767,15 @@ ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo,
fo->set_mask = cfg->set_mask;
ctlv = (ipfw_obj_ctlv *)(cfg + 1);
if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) {
object_sort_ctlv(ctlv);
fo->tstate = ctlv;
readsz += ctlv->head.length;
ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length);
}
if (cfg->flags & IPFW_CFG_GET_STATIC) {
/* We've requested static rules */
if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) {
object_sort_ctlv(ctlv);
fo->tstate = ctlv;
readsz += ctlv->head.length;
ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv +
ctlv->head.length);
}
if (ctlv->head.type == IPFW_TLV_RULE_LIST) {
rbase = (ipfw_obj_tlv *)(ctlv + 1);
rcnt = ctlv->count;
@ -2777,10 +2802,12 @@ ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo,
if (ac == 0) {
fo->first = 0;
fo->last = IPFW_DEFAULT_RULE;
list_static_range(co, fo, &bp, rbase, rcnt);
if (cfg->flags & IPFW_CFG_GET_STATIC)
list_static_range(co, fo, &bp, rbase, rcnt);
if (co->do_dynamic && dynsz > 0) {
printf("## Dynamic rules (%d %zu):\n", fo->dcnt, dynsz);
printf("## Dynamic rules (%d %zu):\n", fo->dcnt,
dynsz);
list_dyn_range(co, fo, &bp, dynbase, dynsz);
}
@ -2800,6 +2827,9 @@ ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo,
continue;
}
if ((cfg->flags & IPFW_CFG_GET_STATIC) == 0)
continue;
if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) {
/* give precedence to other error(s) */
if (exitval == EX_OK)
@ -3313,6 +3343,8 @@ ipfw_delete(char *av[])
rt.flags |= IPFW_RCFLAG_SET;
}
}
if (co.do_dynamic == 2)
rt.flags |= IPFW_RCFLAG_DYNAMIC;
i = do_range_cmd(IP_FW_XDEL, &rt);
if (i != 0) {
exitval = EX_UNAVAILABLE;
@ -3320,7 +3352,8 @@ ipfw_delete(char *av[])
continue;
warn("rule %u: setsockopt(IP_FW_XDEL)",
rt.start_rule);
} else if (rt.new_set == 0 && do_set == 0) {
} else if (rt.new_set == 0 && do_set == 0 &&
co.do_dynamic != 2) {
exitval = EX_UNAVAILABLE;
if (co.do_quiet)
continue;

4
sbin/ipfw/ipfw2.h
View File

@ -37,8 +37,6 @@ struct cmdline_opts {
int do_quiet; /* Be quiet in add and flush */
int do_pipe; /* this cmd refers to a pipe/queue/sched */
int do_nat; /* this cmd refers to a nat config */
int do_dynamic; /* display dynamic rules */
int do_expired; /* display expired dynamic rules */
int do_compact; /* show rules in compact mode */
int do_force; /* do not ask for confirmation */
int show_sets; /* display the set each rule belongs to */
@ -48,6 +46,8 @@ struct cmdline_opts {
/* The options below can have multiple values. */
int do_dynamic; /* 1 - display dynamic rules */
/* 2 - display/delete only dynamic rules */
int do_sort; /* field to sort results (0 = no) */
/* valid fields are 1 and above */

8
sbin/ipfw/main.c
View File

@ -262,7 +262,7 @@ ipfw_main(int oldac, char **oldav)
save_av = av;
optind = optreset = 1; /* restart getopt() */
while ((ch = getopt(ac, av, "abcdefhinNp:qs:STtv")) != -1)
while ((ch = getopt(ac, av, "abcdDefhinNp:qs:STtv")) != -1)
switch (ch) {
case 'a':
do_acct = 1;
@ -281,8 +281,12 @@ ipfw_main(int oldac, char **oldav)
co.do_dynamic = 1;
break;
case 'D':
co.do_dynamic = 2;
break;
case 'e':
co.do_expired = 1;
/* nop for compatibility */
break;
case 'f':

4
sys/netinet/ip_fw.h
View File

@ -708,6 +708,7 @@ struct _ipfw_dyn_rule {
u_int32_t state; /* state of this rule (typically a
* combination of TCP flags)
*/
#define IPFW_DYN_ORPHANED 0x40000 /* state's parent rule was deleted */
u_int32_t ack_fwd; /* most recent ACKs in forward */
u_int32_t ack_rev; /* and reverse directions (used */
/* to generate keepalives) */
@ -938,9 +939,10 @@ typedef struct _ipfw_range_tlv {
#define IPFW_RCFLAG_RANGE 0x01 /* rule range is set */
#define IPFW_RCFLAG_ALL 0x02 /* match ALL rules */
#define IPFW_RCFLAG_SET 0x04 /* match rules in given set */
#define IPFW_RCFLAG_DYNAMIC 0x08 /* match only dynamic states */
/* User-settable flags */
#define IPFW_RCFLAG_USER (IPFW_RCFLAG_RANGE | IPFW_RCFLAG_ALL | \
IPFW_RCFLAG_SET)
IPFW_RCFLAG_SET | IPFW_RCFLAG_DYNAMIC)
/* Internally used flags */
#define IPFW_RCFLAG_DEFAULT 0x0100 /* Do not skip defaul rule */

22
sys/netpfil/ipfw/ip_fw_dynamic.c
View File

@ -2110,7 +2110,11 @@ dyn_free_states(struct ip_fw_chain *chain)
}
/*
* Returns 1 when state is matched by specified range, otherwise returns 0.
* Returns:
* 0 when state is not matched by specified range;
* 1 when state is matched by specified range;
* 2 when state is matched by specified range and requested deletion of
* dynamic states.
*/
static int
dyn_match_range(uint16_t rulenum, uint8_t set, const ipfw_range_tlv *rt)
@ -2118,13 +2122,18 @@ dyn_match_range(uint16_t rulenum, uint8_t set, const ipfw_range_tlv *rt)
MPASS(rt != NULL);
/* flush all states */
if (rt->flags & IPFW_RCFLAG_ALL)
if (rt->flags & IPFW_RCFLAG_ALL) {
if (rt->flags & IPFW_RCFLAG_DYNAMIC)
return (2); /* forced */
return (1);
}
if ((rt->flags & IPFW_RCFLAG_SET) != 0 && set != rt->set)
return (0);
if ((rt->flags & IPFW_RCFLAG_RANGE) != 0 &&
(rulenum < rt->start_rule || rulenum > rt->end_rule))
return (0);
if (rt->flags & IPFW_RCFLAG_DYNAMIC)
return (2);
return (1);
}
@ -2194,7 +2203,7 @@ dyn_match_ipv4_state(struct ip_fw_chain *ch, struct dyn_ipv4_state *s,
s->limit->set, rt));
ret = dyn_match_range(s->data->rulenum, s->data->set, rt);
if (ret == 0 || V_dyn_keep_states == 0)
if (ret == 0 || V_dyn_keep_states == 0 || ret > 1)
return (ret);
rule = s->data->parent;
@ -2217,7 +2226,7 @@ dyn_match_ipv6_state(struct ip_fw_chain *ch, struct dyn_ipv6_state *s,
s->limit->set, rt));
ret = dyn_match_range(s->data->rulenum, s->data->set, rt);
if (ret == 0 || V_dyn_keep_states == 0)
if (ret == 0 || V_dyn_keep_states == 0 || ret > 1)
return (ret);
rule = s->data->parent;
@ -2939,9 +2948,12 @@ dyn_export_data(const struct dyn_data *data, uint16_t kidx, uint8_t type,
memcpy((char *)&dst->rule + sizeof(data->rulenum), &data->set,
sizeof(data->set));
dst->state = data->state;
if (data->flags & DYN_REFERENCED)
dst->state |= IPFW_DYN_ORPHANED;
/* unused fields */
dst->parent = NULL;
dst->state = data->state;
dst->ack_fwd = data->ack_fwd;
dst->ack_rev = data->ack_rev;
dst->count = 0;

11
sys/netpfil/ipfw/ip_fw_sockopt.c
View File

@ -1033,6 +1033,16 @@ delete_range(struct ip_fw_chain *chain, ipfw_range_tlv *rt, int *ndel)
end = ipfw_find_rule(chain, rt->end_rule, UINT32_MAX);
}
if (rt->flags & IPFW_RCFLAG_DYNAMIC) {
/*
* Requested deleting only for dynamic states.
*/
*ndel = 0;
ipfw_expire_dyn_states(chain, rt);
IPFW_UH_WUNLOCK(chain);
return (0);
}
/* Allocate new map of the same size */
map = get_map(chain, 0, 1 /* locked */);
if (map == NULL) {
@ -2402,7 +2412,6 @@ dump_config(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
da.bmask = bmask = malloc(
sizeof(uint32_t) * IPFW_TABLES_MAX * 2 / 32, M_TEMP,
M_WAITOK | M_ZERO);
IPFW_UH_RLOCK(chain);
/*