This patch adds a new feature to iptables that allow bitshifting for
--restore,set and save-mark operations. This allows existing logic
operators (and, or and xor) and mask to co-operate with new bitshift
operations.
The intention is to provide uses with more fexible uses of skb->mark
and ct->mark. For example, users can save extra bits in skb->mark:
skb->mark = ct->mark << 8;
Reviewed-by: Florian Westphal <[email protected]>
Signed-off-by: Jack Ma <[email protected]>
---
extensions/libxt_CONNMARK.c | 161 +++++++++++++++++++++++++++++++---
include/linux/netfilter/xt_connmark.h | 5 ++
2 files changed, 154 insertions(+), 12 deletions(-)
diff --git a/extensions/libxt_CONNMARK.c b/extensions/libxt_CONNMARK.c
index 94984cdc..331fdc78 100644
--- a/extensions/libxt_CONNMARK.c
+++ b/extensions/libxt_CONNMARK.c
@@ -28,34 +28,48 @@
struct xt_connmark_target_info {
unsigned long mark;
unsigned long mask;
+ uint8_t shift_dir;
+ uint8_t shift_bits;
uint8_t mode;
};
enum {
+ D_SHIFT_LEFT = 0,
+ D_SHIFT_RIGHT,
+};
+
+enum {
O_SET_MARK = 0,
O_SAVE_MARK,
O_RESTORE_MARK,
O_AND_MARK,
O_OR_MARK,
O_XOR_MARK,
+ O_LEFT_SHIFT_MARK,
+ O_RIGHT_SHIFT_MARK,
O_SET_XMARK,
O_CTMASK,
O_NFMASK,
O_MASK,
- F_SET_MARK = 1 << O_SET_MARK,
- F_SAVE_MARK = 1 << O_SAVE_MARK,
- F_RESTORE_MARK = 1 << O_RESTORE_MARK,
- F_AND_MARK = 1 << O_AND_MARK,
- F_OR_MARK = 1 << O_OR_MARK,
- F_XOR_MARK = 1 << O_XOR_MARK,
- F_SET_XMARK = 1 << O_SET_XMARK,
- F_CTMASK = 1 << O_CTMASK,
- F_NFMASK = 1 << O_NFMASK,
- F_MASK = 1 << O_MASK,
- F_OP_ANY = F_SET_MARK | F_SAVE_MARK | F_RESTORE_MARK |
- F_AND_MARK | F_OR_MARK | F_XOR_MARK | F_SET_XMARK,
+ F_SET_MARK = 1 << O_SET_MARK,
+ F_SAVE_MARK = 1 << O_SAVE_MARK,
+ F_RESTORE_MARK = 1 << O_RESTORE_MARK,
+ F_AND_MARK = 1 << O_AND_MARK,
+ F_OR_MARK = 1 << O_OR_MARK,
+ F_XOR_MARK = 1 << O_XOR_MARK,
+ F_LEFT_SHIFT_MARK = 1 << O_LEFT_SHIFT_MARK,
+ F_RIGHT_SHIFT_MARK = 1 << O_RIGHT_SHIFT_MARK,
+ F_SET_XMARK = 1 << O_SET_XMARK,
+ F_CTMASK = 1 << O_CTMASK,
+ F_NFMASK = 1 << O_NFMASK,
+ F_MASK = 1 << O_MASK,
+ F_OP_ANY = F_SET_MARK | F_SAVE_MARK | F_RESTORE_MARK |
+ F_AND_MARK | F_OR_MARK | F_XOR_MARK | F_SET_XMARK,
};
+static const char *const xt_connmark_shift_ops[] =
+ { "left-shift", "right-shift" };
+
static void CONNMARK_help(void)
{
printf(
@@ -104,6 +118,34 @@ static const struct xt_option_entry connmark_tg_opts[] = {
};
#undef s
+#define s struct xt_connmark_tginfo2
+static const struct xt_option_entry connmark_tg_opts_v2[] = {
+ {.name = "set-xmark", .id = O_SET_XMARK, .type = XTTYPE_MARKMASK32,
+ .excl = F_OP_ANY},
+ {.name = "set-mark", .id = O_SET_MARK, .type = XTTYPE_MARKMASK32,
+ .excl = F_OP_ANY},
+ {.name = "and-mark", .id = O_AND_MARK, .type = XTTYPE_UINT32,
+ .excl = F_OP_ANY},
+ {.name = "or-mark", .id = O_OR_MARK, .type = XTTYPE_UINT32,
+ .excl = F_OP_ANY},
+ {.name = "xor-mark", .id = O_XOR_MARK, .type = XTTYPE_UINT32,
+ .excl = F_OP_ANY},
+ {.name = "save-mark", .id = O_SAVE_MARK, .type = XTTYPE_NONE,
+ .excl = F_OP_ANY},
+ {.name = "restore-mark", .id = O_RESTORE_MARK, .type = XTTYPE_NONE,
+ .excl = F_OP_ANY},
+ {.name = "left-shift-mark", .id = O_LEFT_SHIFT_MARK, .type =
XTTYPE_UINT8},
+ {.name = "right-shift-mark", .id = O_RIGHT_SHIFT_MARK, .type =
XTTYPE_UINT8},
+ {.name = "ctmask", .id = O_CTMASK, .type = XTTYPE_UINT32,
+ .excl = F_MASK, .flags = XTOPT_PUT, XTOPT_POINTER(s, ctmask)},
+ {.name = "nfmask", .id = O_NFMASK, .type = XTTYPE_UINT32,
+ .excl = F_MASK, .flags = XTOPT_PUT, XTOPT_POINTER(s, nfmask)},
+ {.name = "mask", .id = O_MASK, .type = XTTYPE_UINT32,
+ .excl = F_CTMASK | F_NFMASK},
+ XTOPT_TABLEEND,
+};
+#undef s
+
static void connmark_tg_help(void)
{
printf(
@@ -122,6 +164,15 @@ static void connmark_tg_help(void)
);
}
+static void connmark_tg_help_v2(void)
+{
+ connmark_tg_help();
+ printf(
+" --left-shift-mark value Left shift the ctmark with bits\n"
+" --right-shift-mark value Right shift the ctmark with bits\n"
+);
+}
+
static void connmark_tg_init(struct xt_entry_target *target)
{
struct xt_connmark_tginfo1 *info = (void *)target->data;
@@ -134,6 +185,18 @@ static void connmark_tg_init(struct xt_entry_target
*target)
info->nfmask = UINT32_MAX;
}
+static void connmark_tg_init_v2(struct xt_entry_target *target)
+{
+ struct xt_connmark_tginfo2 *info;
+
+ connmark_tg_init(target);
+ info = (void *)target->data;
+
+ /* Left shift by zero bit by default. */
+ info->shift_dir = D_SHIFT_LEFT;
+ info->shift_bits = 0;
+}
+
static void CONNMARK_parse(struct xt_option_call *cb)
{
struct xt_connmark_target_info *markinfo = cb->data;
@@ -200,6 +263,22 @@ static void connmark_tg_parse(struct xt_option_call *cb)
}
}
+static void connmark_tg_parse_v2(struct xt_option_call *cb)
+{
+ struct xt_connmark_tginfo2 *info = cb->data;
+
+ connmark_tg_parse(cb);
+
+ if (cb->entry->id == O_LEFT_SHIFT_MARK) {
+ info->shift_dir = D_SHIFT_LEFT;
+ info->shift_bits = cb->val.u8;
+ }
+ else if (cb->entry->id == O_LEFT_SHIFT_MARK) {
+ info->shift_dir = D_SHIFT_RIGHT;
+ info->shift_bits = cb->val.u8;
+ }
+}
+
static void connmark_tg_check(struct xt_fcheck_call *cb)
{
if (!(cb->xflags & F_OP_ANY))
@@ -291,6 +370,20 @@ connmark_tg_print(const void *ip, const struct
xt_entry_target *target,
}
}
+static void
+connmark_tg_print_v2(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ const struct xt_connmark_tginfo2 *info = (const void *)target->data;
+ const char *shift_op = xt_connmark_shift_ops[info->shift_dir];
+
+ connmark_tg_print (ip, target, numeric);
+
+ if (info->mode <= XT_CONNMARK_RESTORE) {
+ printf(" %s %d",shift_op, info->shift_bits);
+ }
+}
+
static void CONNMARK_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_connmark_target_info *markinfo =
@@ -347,6 +440,19 @@ connmark_tg_save(const void *ip, const struct
xt_entry_target *target)
}
}
+static void
+connmark_tg_save_v2(const void *ip, const struct xt_entry_target *target)
+{
+ const struct xt_connmark_tginfo2 *info = (const void *)target->data;
+ const char *shift_op = xt_connmark_shift_ops[info->shift_dir];
+
+ connmark_tg_save(ip, target);
+
+ if (info->mode <= XT_CONNMARK_RESTORE) {
+ printf(" --%s %d",shift_op, info->shift_bits);
+ }
+}
+
static int connmark_tg_xlate(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
@@ -389,6 +495,21 @@ static int connmark_tg_xlate(struct xt_xlate *xl,
return 1;
}
+static int connmark_tg_xlate_v2(struct xt_xlate *xl,
+ const struct xt_xlate_tg_params *params)
+{
+ const struct xt_connmark_tginfo2 *info =
+ (const void *)params->target->data;
+ const char *shift_op = xt_connmark_shift_ops[info->shift_dir];
+
+ connmark_tg_xlate(xl, params);
+
+ if (info->mode <= XT_CONNMARK_RESTORE) {
+ xt_xlate_add(xl, " %s %d", shift_op, info->shift_bits);
+ }
+
+ return 1;
+}
static struct xtables_target connmark_tg_reg[] = {
{
.family = NFPROTO_UNSPEC,
@@ -421,6 +542,22 @@ static struct xtables_target connmark_tg_reg[] = {
.x6_options = connmark_tg_opts,
.xlate = connmark_tg_xlate,
},
+ {
+ .version = XTABLES_VERSION,
+ .name = "CONNMARK",
+ .revision = 2,
+ .family = NFPROTO_UNSPEC,
+ .size = XT_ALIGN(sizeof(struct xt_connmark_tginfo2)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_connmark_tginfo2)),
+ .help = connmark_tg_help_v2,
+ .init = connmark_tg_init_v2,
+ .print = connmark_tg_print_v2,
+ .save = connmark_tg_save_v2,
+ .x6_parse = connmark_tg_parse_v2,
+ .x6_fcheck = connmark_tg_check,
+ .x6_options = connmark_tg_opts_v2,
+ .xlate = connmark_tg_xlate_v2,
+ },
};
void _init(void)
diff --git a/include/linux/netfilter/xt_connmark.h
b/include/linux/netfilter/xt_connmark.h
index efc17a83..bbf2acc9 100644
--- a/include/linux/netfilter/xt_connmark.h
+++ b/include/linux/netfilter/xt_connmark.h
@@ -23,6 +23,11 @@ struct xt_connmark_tginfo1 {
__u8 mode;
};
+struct xt_connmark_tginfo2 {
+ __u32 ctmark, ctmask, nfmask;
+ __u8 shift_dir, shift_bits, mode;
+};
+
struct xt_connmark_mtinfo1 {
__u32 mark, mask;
__u8 invert;
--
2.13.0
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