Adds nft_arp_save_firewall to arp family.
(Avoids the segfault in xtables-events)
Signed-off-by: Giuseppe Longo <giuseppelng@xxxxxxxxx>
---
iptables/nft-arp.c | 172 +++++++++++++++++++++++++++++++++--------------------
1 file changed, 109 insertions(+), 63 deletions(-)
diff --git a/iptables/nft-arp.c b/iptables/nft-arp.c
index 1710136..a494ee6 100644
--- a/iptables/nft-arp.c
+++ b/iptables/nft-arp.c
@@ -397,36 +397,36 @@ void nft_rule_to_arpt_entry(struct nft_rule *r, struct arpt_entry *fw)
nft_rule_expr_iter_destroy(iter);
}
-static void
-nft_arp_print_firewall(struct nft_rule *r, unsigned int num,
- unsigned int format)
+static struct xtables_target
+*get_target(struct arpt_entry *fw, unsigned int format)
{
- struct arpt_entry fw = {};
const char *targname;
struct xtables_target *target = NULL;
const struct xt_entry_target *t;
- char buf[BUFSIZ];
- int i;
- char iface[IFNAMSIZ+2];
- int print_iface = 0;
- nft_rule_to_arpt_entry(r, &fw);
+ if (!fw->target_offset)
+ return NULL;
- if (format & FMT_LINENUMBERS)
- printf("%u ", num);
+ t = nft_arp_get_target(fw);
+ targname = t->u.user.name;
+ target = xtables_find_target(targname, XTF_TRY_LOAD);
+ if (!(format & FMT_NOTARGET))
+ printf("-j %s ", targname);
- if (fw.target_offset) {
- t = nft_arp_get_target(&fw);
- targname = t->u.user.name;
- target = xtables_find_target(targname, XTF_TRY_LOAD);
- if (!(format & FMT_NOTARGET))
- printf("-j %s ", targname);
- }
+ return target;
+}
+
+static void print_fw_details(struct arpt_entry *fw, unsigned int format)
+{
+ char buf[BUFSIZ];
+ char iface[IFNAMSIZ+2];
+ int print_iface = 0;
+ int i;
iface[0] = '\0';
- if (fw.arp.iniface[0] != '\0') {
- strcat(iface, fw.arp.iniface);
+ if (fw->arp.iniface[0] != '\0') {
+ strcat(iface, fw->arp.iniface);
print_iface = 1;
}
else if (format & FMT_VIA) {
@@ -435,13 +435,14 @@ nft_arp_print_firewall(struct nft_rule *r, unsigned int num,
else strcat(iface, "any");
}
if (print_iface)
- printf("%s-i %s ", fw.arp.invflags & ARPT_INV_VIA_IN ? "! ": "", iface);
+ printf("%s-i %s ", fw->arp.invflags & ARPT_INV_VIA_IN ?
+ "! " : "", iface);
print_iface = 0;
iface[0] = '\0';
- if (fw.arp.outiface[0] != '\0') {
- strcat(iface, fw.arp.outiface);
+ if (fw->arp.outiface[0] != '\0') {
+ strcat(iface, fw->arp.outiface);
print_iface = 1;
}
else if (format & FMT_VIA) {
@@ -450,108 +451,127 @@ nft_arp_print_firewall(struct nft_rule *r, unsigned int num,
else strcat(iface, "any");
}
if (print_iface)
- printf("%s-o %s ", fw.arp.invflags & ARPT_INV_VIA_OUT ? "! " : "", iface);
+ printf("%s-o %s ", fw->arp.invflags & ARPT_INV_VIA_OUT ?
+ "! " : "", iface);
- if (fw.arp.smsk.s_addr != 0L) {
- printf("%s", fw.arp.invflags & ARPT_INV_SRCIP
+ if (fw->arp.smsk.s_addr != 0L) {
+ printf("%s", fw->arp.invflags & ARPT_INV_SRCIP
? "! " : "");
if (format & FMT_NUMERIC)
- sprintf(buf, "%s", addr_to_dotted(&(fw.arp.src)));
+ sprintf(buf, "%s", addr_to_dotted(&(fw->arp.src)));
else
- sprintf(buf, "%s", addr_to_anyname(&(fw.arp.src)));
- strncat(buf, mask_to_dotted(&(fw.arp.smsk)),
+ sprintf(buf, "%s", addr_to_anyname(&(fw->arp.src)));
+ strncat(buf, mask_to_dotted(&(fw->arp.smsk)),
sizeof(buf) - strlen(buf) - 1);
printf("-s %s ", buf);
}
for (i = 0; i < ARPT_DEV_ADDR_LEN_MAX; i++)
- if (fw.arp.src_devaddr.mask[i] != 0)
+ if (fw->arp.src_devaddr.mask[i] != 0)
break;
if (i == ARPT_DEV_ADDR_LEN_MAX)
goto after_devsrc;
- printf("%s", fw.arp.invflags & ARPT_INV_SRCDEVADDR
+ printf("%s", fw->arp.invflags & ARPT_INV_SRCDEVADDR
? "! " : "");
printf("--src-mac ");
- print_mac_and_mask((unsigned char *)fw.arp.src_devaddr.addr,
- (unsigned char *)fw.arp.src_devaddr.mask, ETH_ALEN);
+ print_mac_and_mask((unsigned char *)fw->arp.src_devaddr.addr,
+ (unsigned char *)fw->arp.src_devaddr.mask, ETH_ALEN);
printf(" ");
after_devsrc:
- if (fw.arp.tmsk.s_addr != 0L) {
- printf("%s",fw.arp.invflags & ARPT_INV_TGTIP
+ if (fw->arp.tmsk.s_addr != 0L) {
+ printf("%s", fw->arp.invflags & ARPT_INV_TGTIP
? "! " : "");
if (format & FMT_NUMERIC)
- sprintf(buf, "%s", addr_to_dotted(&(fw.arp.tgt)));
+ sprintf(buf, "%s", addr_to_dotted(&(fw->arp.tgt)));
else
- sprintf(buf, "%s", addr_to_anyname(&(fw.arp.tgt)));
- strncat(buf, mask_to_dotted(&(fw.arp.tmsk)),
+ sprintf(buf, "%s", addr_to_anyname(&(fw->arp.tgt)));
+ strncat(buf, mask_to_dotted(&(fw->arp.tmsk)),
sizeof(buf) - strlen(buf) - 1);
printf("-d %s ", buf);
}
for (i = 0; i <ARPT_DEV_ADDR_LEN_MAX; i++)
- if (fw.arp.tgt_devaddr.mask[i] != 0)
+ if (fw->arp.tgt_devaddr.mask[i] != 0)
break;
if (i == ARPT_DEV_ADDR_LEN_MAX)
goto after_devdst;
- printf("%s",fw.arp.invflags & ARPT_INV_TGTDEVADDR
+ printf("%s", fw->arp.invflags & ARPT_INV_TGTDEVADDR
? "! " : "");
printf("--dst-mac ");
- print_mac_and_mask((unsigned char *)fw.arp.tgt_devaddr.addr,
- (unsigned char *)fw.arp.tgt_devaddr.mask, ETH_ALEN);
+ print_mac_and_mask((unsigned char *)fw->arp.tgt_devaddr.addr,
+ (unsigned char *)fw->arp.tgt_devaddr.mask, ETH_ALEN);
printf(" ");
+
after_devdst:
- if (fw.arp.arhln_mask != 0) {
- printf("%s",fw.arp.invflags & ARPT_INV_ARPHLN
+ if (fw->arp.arhln_mask != 0) {
+ printf("%s", fw->arp.invflags & ARPT_INV_ARPHLN
? "! " : "");
- printf("--h-length %d", fw.arp.arhln);
- if (fw.arp.arhln_mask != 255)
- printf("/%d", fw.arp.arhln_mask);
+ printf("--h-length %d", fw->arp.arhln);
+ if (fw->arp.arhln_mask != 255)
+ printf("/%d", fw->arp.arhln_mask);
printf(" ");
}
- if (fw.arp.arpop_mask != 0) {
- int tmp = ntohs(fw.arp.arpop);
+ if (fw->arp.arpop_mask != 0) {
+ int tmp = ntohs(fw->arp.arpop);
- printf("%s",fw.arp.invflags & ARPT_INV_ARPOP
+ printf("%s", fw->arp.invflags & ARPT_INV_ARPOP
? "! " : "");
if (tmp <= NUMOPCODES && !(format & FMT_NUMERIC))
printf("--opcode %s", opcodes[tmp-1]);
else
- printf("--opcode %d", tmp);
- if (fw.arp.arpop_mask != 65535)
- printf("/%d", ntohs(fw.arp.arpop_mask));
+
+ if (fw->arp.arpop_mask != 65535)
+ printf("/%d", ntohs(fw->arp.arpop_mask));
printf(" ");
}
- if (fw.arp.arhrd_mask != 0) {
- uint16_t tmp = ntohs(fw.arp.arhrd);
+ if (fw->arp.arhrd_mask != 0) {
+ uint16_t tmp = ntohs(fw->arp.arhrd);
- printf("%s", fw.arp.invflags & ARPT_INV_ARPHRD
+ printf("%s", fw->arp.invflags & ARPT_INV_ARPHRD
? "! " : "");
if (tmp == 1 && !(format & FMT_NUMERIC))
printf("--h-type %s", "Ethernet");
else
printf("--h-type %u", tmp);
- if (fw.arp.arhrd_mask != 65535)
- printf("/%d", ntohs(fw.arp.arhrd_mask));
+ if (fw->arp.arhrd_mask != 65535)
+ printf("/%d", ntohs(fw->arp.arhrd_mask));
printf(" ");
}
- if (fw.arp.arpro_mask != 0) {
- int tmp = ntohs(fw.arp.arpro);
+ if (fw->arp.arpro_mask != 0) {
+ int tmp = ntohs(fw->arp.arpro);
- printf("%s", fw.arp.invflags & ARPT_INV_ARPPRO
+ printf("%s", fw->arp.invflags & ARPT_INV_ARPPRO
? "! " : "");
if (tmp == 0x0800 && !(format & FMT_NUMERIC))
printf("--proto-type %s", "IPv4");
else
printf("--proto-type 0x%x", tmp);
- if (fw.arp.arpro_mask != 65535)
- printf("/%x", ntohs(fw.arp.arpro_mask));
+ if (fw->arp.arpro_mask != 65535)
+ printf("/%x", ntohs(fw->arp.arpro_mask));
printf(" ");
}
+}
+
+static void
+nft_arp_print_firewall(struct nft_rule *r, unsigned int num,
+ unsigned int format)
+{
+ struct arpt_entry fw = {};
+ struct xtables_target *target = NULL;
+ const struct xt_entry_target *t = NULL;
+
+ nft_rule_to_arpt_entry(r, &fw);
+
+ if (format & FMT_LINENUMBERS)
+ printf("%u ", num);
+
+ target = get_target(&fw, format);
+ print_fw_details(&fw, format);
if (target) {
if (target->print)
@@ -570,6 +590,31 @@ after_devdst:
fputc('\n', stdout);
}
+static void nft_arp_save_firewall(const void *data,
+ unsigned int format)
+{
+ const struct arpt_entry *fw = data;
+ struct xtables_target *target = NULL;
+ const struct xt_entry_target *t = NULL;
+
+ print_fw_details((struct arpt_entry *)fw, format);
+
+ if (!(format & FMT_NOCOUNTS)) {
+ printf("-c ");
+ xtables_print_num(fw->counters.pcnt, format);
+ xtables_print_num(fw->counters.bcnt, format);
+ }
+
+ target = get_target((struct arpt_entry *)fw, format);
+
+ if (target) {
+ if (target->print)
+ /* Print the target information. */
+ target->print(&fw->arp, t, format & FMT_NUMERIC);
+ }
+ printf("\n");
+}
+
static bool nft_arp_is_same(const void *data_a,
const void *data_b)
{
@@ -643,6 +688,7 @@ struct nft_family_ops nft_family_ops_arp = {
.parse_payload = nft_arp_parse_payload,
.parse_immediate = nft_arp_parse_immediate,
.print_firewall = nft_arp_print_firewall,
+ .save_firewall = nft_arp_save_firewall,
.post_parse = NULL,
.rule_find = nft_arp_rule_find,
.parse_target = nft_arp_parse_target,
--
1.8.3.2
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