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tc: flower: Add matching on conntrack info 

Matches on conntrack state, zone, mark, and label.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Yossi Kuperman <yossiku@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Paul Blakey 2019-07-11 11:14:27 +03:00 committed by David Ahern
parent c8a494314c
commit 2fffb1c030
2 changed files with 310 additions and 1 deletions
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35
man/man8/tc-flower.8
View File

@ -289,6 +289,41 @@ bits is assumed.
.TQ
.BI enc_ttl " NUMBER"
.TQ
.BR
.TP
.BI ct_state " CT_STATE"
.TQ
.BI ct_zone " CT_MASKED_ZONE"
.TQ
.BI ct_mark " CT_MASKED_MARK"
.TQ
.BI ct_label " CT_MASKED_LABEL"
Matches on connection tracking info
.RS
.TP
.I CT_STATE
Match the connection state, and can ne combination of [{+|-}flag] flags, where flag can be one of
.RS
.TP
trk - Tracked connection.
.TP
new - New connection.
.TP
est - Established connection.
.TP
Example: +trk+est
.RE
.TP
.I CT_MASKED_ZONE
Match the connection zone, and can be masked.
.TP
.I CT_MASKED_MARK
32bit match on the connection mark, and can be masked.
.TP
.I CT_MASKED_LABEL
128bit match on the connection label, and can be masked.
.RE
.TP
.BI geneve_opts " OPTIONS"
Match on IP tunnel metadata. Key id
.I NUMBER

276
tc/f_flower.c
View File

@ -82,9 +82,14 @@ static void explain(void)
" enc_ttl MASKED-IP_TTL |\n"
" geneve_opts MASKED-OPTIONS |\n"
" ip_flags IP-FLAGS | \n"
" enc_dst_port [ port_number ] }\n"
" enc_dst_port [ port_number ] |\n"
" ct_state MASKED_CT_STATE |\n"
" ct_label MASKED_CT_LABEL |\n"
" ct_mark MASKED_CT_MARK |\n"
" ct_zone MASKED_CT_ZONE }\n"
" FILTERID := X:Y:Z\n"
" MASKED_LLADDR := { LLADDR | LLADDR/MASK | LLADDR/BITS }\n"
" MASKED_CT_STATE := combination of {+|-} and flags trk,est,new\n"
" ACTION-SPEC := ... look at individual actions\n"
"\n"
"NOTE: CLASSID, IP-PROTO are parsed as hexadecimal input.\n"
@ -214,6 +219,159 @@ static int flower_parse_matching_flags(char *str,
return 0;
}
static int flower_parse_u16(char *str, int value_type, int mask_type,
struct nlmsghdr *n)
{
__u16 value, mask;
char *slash;
slash = strchr(str, '/');
if (slash)
*slash = '\0';
if (get_u16(&value, str, 0))
return -1;
if (slash) {
if (get_u16(&mask, slash + 1, 0))
return -1;
} else {
mask = UINT16_MAX;
}
addattr16(n, MAX_MSG, value_type, value);
addattr16(n, MAX_MSG, mask_type, mask);
return 0;
}
static int flower_parse_u32(char *str, int value_type, int mask_type,
struct nlmsghdr *n)
{
__u32 value, mask;
char *slash;
slash = strchr(str, '/');
if (slash)
*slash = '\0';
if (get_u32(&value, str, 0))
return -1;
if (slash) {
if (get_u32(&mask, slash + 1, 0))
return -1;
} else {
mask = UINT32_MAX;
}
addattr32(n, MAX_MSG, value_type, value);
addattr32(n, MAX_MSG, mask_type, mask);
return 0;
}
static int flower_parse_ct_mark(char *str, struct nlmsghdr *n)
{
return flower_parse_u32(str,
TCA_FLOWER_KEY_CT_MARK,
TCA_FLOWER_KEY_CT_MARK_MASK,
n);
}
static int flower_parse_ct_zone(char *str, struct nlmsghdr *n)
{
return flower_parse_u16(str,
TCA_FLOWER_KEY_CT_ZONE,
TCA_FLOWER_KEY_CT_ZONE_MASK,
n);
}
static int flower_parse_ct_labels(char *str, struct nlmsghdr *n)
{
#define LABELS_SIZE 16
uint8_t labels[LABELS_SIZE], lmask[LABELS_SIZE];
char *slash, *mask = NULL;
size_t slen, slen_mask = 0;
slash = index(str, '/');
if (slash) {
*slash = 0;
mask = slash + 1;
slen_mask = strlen(mask);
}
slen = strlen(str);
if (slen > LABELS_SIZE * 2 || slen_mask > LABELS_SIZE * 2) {
char errmsg[128];
snprintf(errmsg, sizeof(errmsg),
"%zd Max allowed size %d",
slen, LABELS_SIZE*2);
invarg(errmsg, str);
}
if (hex2mem(str, labels, slen / 2) < 0)
invarg("labels must be a hex string\n", str);
addattr_l(n, MAX_MSG, TCA_FLOWER_KEY_CT_LABELS, labels, slen / 2);
if (mask) {
if (hex2mem(mask, lmask, slen_mask / 2) < 0)
invarg("labels mask must be a hex string\n", mask);
} else {
memset(lmask, 0xff, sizeof(lmask));
slen_mask = sizeof(lmask) * 2;
}
addattr_l(n, MAX_MSG, TCA_FLOWER_KEY_CT_LABELS_MASK, lmask,
slen_mask / 2);
return 0;
}
static struct flower_ct_states {
char *str;
int flag;
} flower_ct_states[] = {
{ "trk", TCA_FLOWER_KEY_CT_FLAGS_TRACKED },
{ "new", TCA_FLOWER_KEY_CT_FLAGS_NEW },
{ "est", TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED },
};
static int flower_parse_ct_state(char *str, struct nlmsghdr *n)
{
int flags = 0, mask = 0, len, i;
bool p;
while (*str != '\0') {
if (*str == '+')
p = true;
else if (*str == '-')
p = false;
else
return -1;
for (i = 0; i < ARRAY_SIZE(flower_ct_states); i++) {
len = strlen(flower_ct_states[i].str);
if (strncmp(str + 1, flower_ct_states[i].str, len))
continue;
if (p)
flags |= flower_ct_states[i].flag;
mask |= flower_ct_states[i].flag;
break;
}
if (i == ARRAY_SIZE(flower_ct_states))
return -1;
str += len + 1;
}
addattr16(n, MAX_MSG, TCA_FLOWER_KEY_CT_STATE, flags);
addattr16(n, MAX_MSG, TCA_FLOWER_KEY_CT_STATE_MASK, mask);
return 0;
}
static int flower_parse_ip_proto(char *str, __be16 eth_type, int type,
__u8 *p_ip_proto, struct nlmsghdr *n)
{
@ -898,6 +1056,34 @@ static int flower_parse_opt(struct filter_util *qu, char *handle,
flags |= TCA_CLS_FLAGS_SKIP_HW;
} else if (matches(*argv, "skip_sw") == 0) {
flags |= TCA_CLS_FLAGS_SKIP_SW;
} else if (matches(*argv, "ct_state") == 0) {
NEXT_ARG();
ret = flower_parse_ct_state(*argv, n);
if (ret < 0) {
fprintf(stderr, "Illegal \"ct_state\"\n");
return -1;
}
} else if (matches(*argv, "ct_zone") == 0) {
NEXT_ARG();
ret = flower_parse_ct_zone(*argv, n);
if (ret < 0) {
fprintf(stderr, "Illegal \"ct_zone\"\n");
return -1;
}
} else if (matches(*argv, "ct_mark") == 0) {
NEXT_ARG();
ret = flower_parse_ct_mark(*argv, n);
if (ret < 0) {
fprintf(stderr, "Illegal \"ct_mark\"\n");
return -1;
}
} else if (matches(*argv, "ct_label") == 0) {
NEXT_ARG();
ret = flower_parse_ct_labels(*argv, n);
if (ret < 0) {
fprintf(stderr, "Illegal \"ct_label\"\n");
return -1;
}
} else if (matches(*argv, "indev") == 0) {
NEXT_ARG();
if (check_ifname(*argv))
@ -1590,6 +1776,85 @@ static void flower_print_tcp_flags(const char *name, struct rtattr *flags_attr,
print_string(PRINT_ANY, name, namefrm, out);
}
static void flower_print_ct_state(struct rtattr *flags_attr,
struct rtattr *mask_attr)
{
SPRINT_BUF(out);
uint16_t state;
uint16_t state_mask;
size_t done = 0;
int i;
if (!flags_attr)
return;
state = rta_getattr_u16(flags_attr);
if (mask_attr)
state_mask = rta_getattr_u16(mask_attr);
else
state_mask = UINT16_MAX;
for (i = 0; i < ARRAY_SIZE(flower_ct_states); i++) {
if (!(state_mask & flower_ct_states[i].flag))
continue;
if (state & flower_ct_states[i].flag)
done += sprintf(out + done, "+%s",
flower_ct_states[i].str);
else
done += sprintf(out + done, "-%s",
flower_ct_states[i].str);
}
print_string(PRINT_ANY, "ct_state", "\n ct_state %s", out);
}
static void flower_print_ct_label(struct rtattr *attr,
struct rtattr *mask_attr)
{
const unsigned char *str;
bool print_mask = false;
int data_len, i;
SPRINT_BUF(out);
char *p;
if (!attr)
return;
data_len = RTA_PAYLOAD(attr);
hexstring_n2a(RTA_DATA(attr), data_len, out, sizeof(out));
p = out + data_len*2;
data_len = RTA_PAYLOAD(attr);
str = RTA_DATA(mask_attr);
if (data_len != 16)
print_mask = true;
for (i = 0; !print_mask && i < data_len; i++) {
if (str[i] != 0xff)
print_mask = true;
}
if (print_mask) {
*p++ = '/';
hexstring_n2a(RTA_DATA(mask_attr), data_len, p,
sizeof(out)-(p-out));
p += data_len*2;
}
*p = '\0';
print_string(PRINT_ANY, "ct_label", "\n ct_label %s", out);
}
static void flower_print_ct_zone(struct rtattr *attr,
struct rtattr *mask_attr)
{
print_masked_u16("ct_zone", attr, mask_attr);
}
static void flower_print_ct_mark(struct rtattr *attr,
struct rtattr *mask_attr)
{
print_masked_u32("ct_mark", attr, mask_attr);
}
static void flower_print_key_id(const char *name, struct rtattr *attr)
{
@ -1949,6 +2214,15 @@ static int flower_print_opt(struct filter_util *qu, FILE *f,
tb[TCA_FLOWER_KEY_FLAGS],
tb[TCA_FLOWER_KEY_FLAGS_MASK]);
flower_print_ct_state(tb[TCA_FLOWER_KEY_CT_STATE],
tb[TCA_FLOWER_KEY_CT_STATE_MASK]);
flower_print_ct_zone(tb[TCA_FLOWER_KEY_CT_ZONE],
tb[TCA_FLOWER_KEY_CT_ZONE_MASK]);
flower_print_ct_mark(tb[TCA_FLOWER_KEY_CT_MARK],
tb[TCA_FLOWER_KEY_CT_MARK_MASK]);
flower_print_ct_label(tb[TCA_FLOWER_KEY_CT_LABELS],
tb[TCA_FLOWER_KEY_CT_LABELS_MASK]);
close_json_object();
if (tb[TCA_FLOWER_FLAGS]) {