This patch adds mark filter for event listener, using same struct
nfct_filter_dump_mark at dump.
Signed-off-by: Ken-ichirou MATSUZAWA <chamas@xxxxxxxxxxxxx>
---
include/internal/object.h | 7 +++
.../libnetfilter_conntrack.h | 1 +
src/conntrack/bsf.c | 73 ++++++++++++++++++++++
src/conntrack/filter.c | 13 ++++
4 files changed, 94 insertions(+)
diff --git a/include/internal/object.h b/include/internal/object.h
index 540ad0d..1259467 100644
--- a/include/internal/object.h
+++ b/include/internal/object.h
@@ -263,6 +263,13 @@ struct nfct_filter {
u_int32_t mask[4];
} l3proto_ipv6[2][__FILTER_IPV6_MAX];
+ u_int32_t mark_elems;
+ struct {
+#define __FILTER_MARK_MAX 127
+ u_int32_t val;
+ u_int32_t mask;
+ } mark[__FILTER_MARK_MAX];
+
u_int32_t set[1];
};
diff --git a/include/libnetfilter_conntrack/libnetfilter_conntrack.h b/include/libnetfilter_conntrack/libnetfilter_conntrack.h
index d04a0c6..cea9a78 100644
--- a/include/libnetfilter_conntrack/libnetfilter_conntrack.h
+++ b/include/libnetfilter_conntrack/libnetfilter_conntrack.h
@@ -499,6 +499,7 @@ enum nfct_filter_attr {
NFCT_FILTER_DST_IPV4, /* struct nfct_filter_ipv4 */
NFCT_FILTER_SRC_IPV6, /* struct nfct_filter_ipv6 */
NFCT_FILTER_DST_IPV6, /* struct nfct_filter_ipv6 */
+ NFCT_FILTER_MARK, /* struct nfct_filter_dump_mark */
NFCT_FILTER_MAX
};
diff --git a/src/conntrack/bsf.c b/src/conntrack/bsf.c
index 534202f..bc73369 100644
--- a/src/conntrack/bsf.c
+++ b/src/conntrack/bsf.c
@@ -55,6 +55,9 @@ static char *code2str(u_int16_t code)
case BPF_MISC|BPF_TAX:
return "BPF_MISC|BPF_TAX";
break;
+ case BPF_MISC|BPF_TXA:
+ return "BPF_MISC|BPF_TXA";
+ break;
case BPF_LD|BPF_B|BPF_IND:
return "BPF_LD|BPF_B|BPF_IND";
break;
@@ -228,6 +231,16 @@ nfct_bsf_x_equal_a(struct sock_filter *this, int pos)
}
static int
+nfct_bsf_a_equal_x(struct sock_filter *this, int pos)
+{
+ struct sock_filter __code = {
+ .code = BPF_MISC|BPF_TXA,
+ };
+ memcpy(&this[pos], &__code, sizeof(__code));
+ return NEW_POS(__code);
+}
+
+static int
nfct_bsf_load_attr(struct sock_filter *this, int word_size, int pos)
{
struct sock_filter __code = {
@@ -663,6 +676,63 @@ bsf_add_daddr_ipv6_filter(const struct nfct_filter *f, struct sock_filter *this)
return bsf_add_addr_ipv6_filter(f, this, CTA_IP_V6_DST);
}
+static int
+bsf_add_mark_filter(const struct nfct_filter *f, struct sock_filter *this)
+{
+ unsigned int i, j;
+ unsigned int jt;
+ struct stack *s;
+ struct jump jmp;
+ struct sock_filter __code = {
+ /* if (A == 0) skip next two */
+ .code = BPF_JMP|BPF_JEQ|BPF_K,
+ .k = 0,
+ .jt = 2,
+ .jf = 0,
+ };
+
+ /* nothing to filter, skip */
+ if (f->mark_elems == 0)
+ return 0;
+
+ /* XXX: see bsf_add_addr_ipv4_filter() */
+ s = stack_create(sizeof(struct jump), 3 + 127);
+ if (s == NULL) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ jt = 1;
+ j = 0;
+ j += nfct_bsf_load_payload_offset(this, j); /* A = nla header offset */
+ j += nfct_bsf_find_attr(this, CTA_MARK, j); /* A = CTA_MARK offset, started from A */
+ memcpy(&this[j], &__code, sizeof(__code)); /* if A == 0 skip next two op */
+ j += NEW_POS(__code);
+ j += nfct_bsf_x_equal_a(this, j); /* X = A <CTA_MARK offset> */
+ j += nfct_bsf_load_attr(this, BPF_W, j); /* A = skb->data[X:X + BPF_W] */
+ j += nfct_bsf_x_equal_a(this, j); /* X = A <CTA_MARK value> */
+
+ for (i = 0; i < f->mark_elems; i++) {
+ int mark = f->mark[i].val & f->mark[i].mask;
+
+ j += nfct_bsf_alu_and(this, f->mark[i].mask, j);
+ j += nfct_bsf_cmp_k_stack(this, mark, jt - j, j, s);
+ j += nfct_bsf_a_equal_x(this, j);
+ }
+
+ while (stack_pop(s, &jmp) != -1)
+ this[jmp.line].jt += jmp.jt + j;
+
+ if (f->logic[NFCT_FILTER_MARK] == NFCT_FILTER_LOGIC_NEGATIVE)
+ j += nfct_bsf_jump_to(this, 1, j);
+
+ j += nfct_bsf_ret_verdict(this, NFCT_FILTER_REJECT, j);
+
+ stack_destroy(s);
+
+ return j;
+}
+
/* this buffer must be big enough to store all the autogenerated lines */
#define BSF_BUFFER_SIZE 2048
@@ -696,6 +766,9 @@ int __setup_netlink_socket_filter(int fd, struct nfct_filter *f)
j += bsf_add_state_filter(f, &bsf[j]);
show_filter(bsf, from, j, "---- check state ----");
from = j;
+ j += bsf_add_mark_filter(f, &bsf[j]);
+ show_filter(bsf, from, j, "---- check mark ----");
+ from = j;
/* nothing to filter, skip */
if (j == 0)
diff --git a/src/conntrack/filter.c b/src/conntrack/filter.c
index 026545a..78fbbc5 100644
--- a/src/conntrack/filter.c
+++ b/src/conntrack/filter.c
@@ -79,6 +79,18 @@ static void filter_attr_dst_ipv6(struct nfct_filter *filter, const void *value)
filter->l3proto_elems_ipv6[1]++;
}
+static void filter_attr_mark(struct nfct_filter *filter, const void *value)
+{
+ const struct nfct_filter_dump_mark *this = value;
+
+ if (filter->mark_elems >= __FILTER_MARK_MAX)
+ return;
+
+ filter->mark[filter->mark_elems].val = this->val;
+ filter->mark[filter->mark_elems].mask = this->mask;
+ filter->mark_elems++;
+}
+
const filter_attr filter_attr_array[NFCT_FILTER_MAX] = {
[NFCT_FILTER_L4PROTO] = filter_attr_l4proto,
[NFCT_FILTER_L4PROTO_STATE] = filter_attr_l4proto_state,
@@ -86,4 +98,5 @@ const filter_attr filter_attr_array[NFCT_FILTER_MAX] = {
[NFCT_FILTER_DST_IPV4] = filter_attr_dst_ipv4,
[NFCT_FILTER_SRC_IPV6] = filter_attr_src_ipv6,
[NFCT_FILTER_DST_IPV6] = filter_attr_dst_ipv6,
+ [NFCT_FILTER_MARK] = filter_attr_mark,
};
--
2.1.4
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