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bgpd: support for enumerate pkt len

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The packet length can be injected from fs entry with an enumerate list;
the negation of the value is also taken into account.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2018-06-19 16:02:55 +02:00
parent 56707a36d0
commit cfaf18ce52
2 changed files with 88 additions and 20 deletions
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107
bgpd/bgp_pbr.c
View file

@ -208,6 +208,7 @@ struct bgp_pbr_filter {
struct bgp_pbr_range_port *dst_port;
struct bgp_pbr_val_mask *tcp_flags;
struct bgp_pbr_val_mask *dscp;
struct bgp_pbr_val_mask *pkt_len_val;
};
/* this structure is used to contain OR instructions
@ -217,6 +218,7 @@ struct bgp_pbr_filter {
struct bgp_pbr_or_filter {
struct list *tcpflags;
struct list *dscp;
struct list *pkt_len;
};
/* TCP : FIN and SYN -> val = ALL; mask = 3
@ -255,7 +257,8 @@ static bool bgp_pbr_extract_enumerate_unary(struct bgp_pbr_match_val list[],
and_valmask->mask |=
TCP_HEADER_ALL_FLAGS &
~(list[i].value);
} else if (type_entry == FLOWSPEC_DSCP) {
} else if (type_entry == FLOWSPEC_DSCP ||
type_entry == FLOWSPEC_PKT_LEN) {
and_valmask->val = list[i].value;
and_valmask->mask = 1; /* inverse */
}
@ -267,7 +270,8 @@ static bool bgp_pbr_extract_enumerate_unary(struct bgp_pbr_match_val list[],
and_valmask->mask |=
TCP_HEADER_ALL_FLAGS &
~(list[i].value);
} else if (type_entry == FLOWSPEC_DSCP) {
} else if (type_entry == FLOWSPEC_DSCP ||
type_entry == FLOWSPEC_PKT_LEN) {
and_valmask->val = list[i].value;
and_valmask->mask = 1; /* inverse */
}
@ -288,7 +292,8 @@ static bool bgp_pbr_extract_enumerate_unary(struct bgp_pbr_match_val list[],
and_valmask->val = TCP_HEADER_ALL_FLAGS;
and_valmask->mask |=
TCP_HEADER_ALL_FLAGS & list[i].value;
} else if (type_entry == FLOWSPEC_DSCP)
} else if (type_entry == FLOWSPEC_DSCP ||
type_entry == FLOWSPEC_PKT_LEN)
and_valmask->val = list[i].value;
listnode_add(or_valmask, and_valmask);
}
@ -488,11 +493,23 @@ static int bgp_pbr_validate_policy_route(struct bgp_pbr_entry_main *api)
"too complex. ignoring.");
return 0;
}
if (!bgp_pbr_extract(api->packet_length, api->match_packet_length_num, NULL)) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match packet length operations:"
if (api->match_packet_length_num) {
bool ret;
ret = bgp_pbr_extract(api->packet_length,
api->match_packet_length_num, NULL);
if (!ret)
ret = bgp_pbr_extract_enumerate(api->packet_length,
api->match_packet_length_num,
OPERATOR_UNARY_OR
| OPERATOR_UNARY_AND,
NULL, FLOWSPEC_PKT_LEN);
if (!ret) {
if (BGP_DEBUG(pbr, PBR))
zlog_debug("BGP: match packet length operations:"
"too complex. ignoring.");
return 0;
return 0;
}
}
if (api->match_dscp_num) {
if (!bgp_pbr_extract_enumerate(api->dscp, api->match_dscp_num,
@ -1253,10 +1270,15 @@ static void bgp_pbr_policyroute_remove_from_zebra_unit(struct bgp *bgp,
}
temp2.proto = bpf->protocol;
if (pkt_len)
if (pkt_len) {
temp.pkt_len_min = pkt_len->min_port;
if (pkt_len && pkt_len->max_port)
temp.pkt_len_max = pkt_len->max_port;
if (pkt_len->max_port)
temp.pkt_len_max = pkt_len->max_port;
} else if (bpf->pkt_len_val) {
if (bpf->pkt_len_val->mask)
temp.flags |= MATCH_PKT_LEN_INVERSE_SET;
temp.pkt_len_min = bpf->pkt_len_val->val;
}
if (bpf->tcp_flags) {
temp.tcp_flags = bpf->tcp_flags->val;
temp.tcp_mask_flags = bpf->tcp_flags->mask;
@ -1324,9 +1346,13 @@ static void bgp_pbr_policyroute_remove_from_zebra_recursive(struct bgp *bgp,
orig_list = bpof->tcpflags;
target_val = &bpf->tcp_flags;
} else if (type_entry == FLOWSPEC_DSCP && bpof->dscp) {
next_type_entry = 0;
next_type_entry = FLOWSPEC_PKT_LEN;
orig_list = bpof->dscp;
target_val = &bpf->dscp;
} else if (type_entry == FLOWSPEC_PKT_LEN && bpof->pkt_len) {
next_type_entry = 0;
orig_list = bpof->pkt_len;
target_val = &bpf->pkt_len_val;
} else {
return bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
bpf, bpof, 0);
@ -1356,6 +1382,10 @@ static void bgp_pbr_policyroute_remove_from_zebra(struct bgp *bgp,
bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
bpf, bpof,
FLOWSPEC_DSCP);
else if (bpof->pkt_len)
bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
bpf, bpof,
FLOWSPEC_PKT_LEN);
else
bgp_pbr_policyroute_remove_from_zebra_unit(bgp, binfo, bpf);
/* flush bpof */
@ -1363,6 +1393,8 @@ static void bgp_pbr_policyroute_remove_from_zebra(struct bgp *bgp,
list_delete_all_node(bpof->tcpflags);
if (bpof->dscp)
list_delete_all_node(bpof->dscp);
if (bpof->pkt_len)
list_delete_all_node(bpof->pkt_len);
}
static void bgp_pbr_policyroute_add_to_zebra_unit(struct bgp *bgp,
@ -1436,6 +1468,14 @@ static void bgp_pbr_policyroute_add_to_zebra_unit(struct bgp *bgp,
pkt_len->max_port ?
pkt_len->max_port :
pkt_len->min_port);
} else if (bpf->pkt_len_val) {
remaining_len += snprintf(buffer + remaining_len,
sizeof(buffer)
- remaining_len,
" %s len %u",
bpf->pkt_len_val->mask
? "!" : "",
bpf->pkt_len_val->val);
}
if (bpf->tcp_flags) {
remaining_len += snprintf(buffer + remaining_len,
@ -1516,10 +1556,15 @@ static void bgp_pbr_policyroute_add_to_zebra_unit(struct bgp *bgp,
temp.flags |= MATCH_PORT_SRC_RANGE_SET;
if (dst_port && dst_port->max_port)
temp.flags |= MATCH_PORT_DST_RANGE_SET;
if (pkt_len)
if (pkt_len) {
temp.pkt_len_min = pkt_len->min_port;
if (pkt_len && pkt_len->max_port)
temp.pkt_len_max = pkt_len->max_port;
if (pkt_len->max_port)
temp.pkt_len_max = pkt_len->max_port;
} else if (bpf->pkt_len_val) {
if (bpf->pkt_len_val->mask)
temp.flags |= MATCH_PKT_LEN_INVERSE_SET;
temp.pkt_len_min = bpf->pkt_len_val->val;
}
if (bpf->tcp_flags) {
temp.tcp_flags = bpf->tcp_flags->val;
temp.tcp_mask_flags = bpf->tcp_flags->mask;
@ -1649,9 +1694,13 @@ static void bgp_pbr_policyroute_add_to_zebra_recursive(struct bgp *bgp,
orig_list = bpof->tcpflags;
target_val = &bpf->tcp_flags;
} else if (type_entry == FLOWSPEC_DSCP && bpof->dscp) {
next_type_entry = 0;
next_type_entry = FLOWSPEC_PKT_LEN;
orig_list = bpof->dscp;
target_val = &bpf->dscp;
} else if (type_entry == FLOWSPEC_PKT_LEN && bpof->pkt_len) {
next_type_entry = 0;
orig_list = bpof->pkt_len;
target_val = &bpf->pkt_len_val;
} else {
return bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
bpf, bpof, nh, rate, 0);
@ -1685,6 +1734,11 @@ static void bgp_pbr_policyroute_add_to_zebra(struct bgp *bgp,
bpf, bpof,
nh, rate,
FLOWSPEC_DSCP);
else if (bpof->pkt_len)
bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
bpf, bpof,
nh, rate,
FLOWSPEC_PKT_LEN);
else
bgp_pbr_policyroute_add_to_zebra_unit(bgp, binfo, bpf,
nh, rate);
@ -1693,6 +1747,8 @@ static void bgp_pbr_policyroute_add_to_zebra(struct bgp *bgp,
list_delete_all_node(bpof->tcpflags);
if (bpof->dscp)
list_delete_all_node(bpof->dscp);
if (bpof->pkt_len)
list_delete_all_node(bpof->pkt_len);
}
static const struct message icmp_code_unreach_str[] = {
@ -1938,11 +1994,22 @@ static void bgp_pbr_handle_entry(struct bgp *bgp,
FLOWSPEC_TCP_FLAGS);
}
}
if (api->match_packet_length_num >= 1) {
bgp_pbr_extract(api->packet_length,
api->match_packet_length_num,
&pkt_len);
bpf.pkt_len = &pkt_len;
if (api->match_packet_length_num) {
bool ret;
ret = bgp_pbr_extract(api->packet_length,
api->match_packet_length_num,
&pkt_len);
if (ret)
bpf.pkt_len = &pkt_len;
else {
bpof.pkt_len = list_new();
bgp_pbr_extract_enumerate(api->packet_length,
api->match_packet_length_num,
OPERATOR_UNARY_OR,
bpof.pkt_len,
FLOWSPEC_PKT_LEN);
}
}
if (api->match_dscp_num >= 1) {
bpof.dscp = list_new();

1
lib/pbr.h
View file

@ -114,6 +114,7 @@ struct pbr_rule {
#define MATCH_PORT_DST_RANGE_SET (1 << 5)
#define MATCH_DSCP_SET (1 << 6)
#define MATCH_DSCP_INVERSE_SET (1 << 7)
#define MATCH_PKT_LEN_INVERSE_SET (1 << 8)
extern int zapi_pbr_rule_encode(uint8_t cmd, struct stream *s,
struct pbr_rule *zrule);