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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
Copyright © 2016 BISDN GmbH. All rights reserved.
***/
#include <netinet/in.h>
#include <linux/if_bridge.h>
#include <stdbool.h>
#include "alloc-util.h"
#include "conf-parser.h"
#include "netlink-util.h"
#include "networkd-bridge-vlan.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "parse-util.h"
#include "vlan-util.h"
static bool is_bit_set(unsigned bit, uint32_t scope) {
assert(bit < sizeof(scope)*8);
return scope & (UINT32_C(1) << bit);
}
static void set_bit(unsigned nr, uint32_t *addr) {
if (nr < BRIDGE_VLAN_BITMAP_MAX)
addr[nr / 32] |= (UINT32_C(1) << (nr % 32));
}
static int find_next_bit(int i, uint32_t x) {
int j;
if (i >= 32)
return -1;
/* find first bit */
if (i < 0)
return BUILTIN_FFS_U32(x);
/* mask off prior finds to get next */
j = __builtin_ffs(x >> i);
return j ? j + i : 0;
}
int bridge_vlan_append_info(
const Link *link,
sd_netlink_message *req,
uint16_t pvid,
const uint32_t *br_vid_bitmap,
const uint32_t *br_untagged_bitmap) {
struct bridge_vlan_info br_vlan;
bool done, untagged = false;
uint16_t begin, end;
int r, cnt;
assert(link);
assert(req);
assert(br_vid_bitmap);
assert(br_untagged_bitmap);
cnt = 0;
begin = end = UINT16_MAX;
for (int k = 0; k < BRIDGE_VLAN_BITMAP_LEN; k++) {
uint32_t untagged_map = br_untagged_bitmap[k];
uint32_t vid_map = br_vid_bitmap[k];
unsigned base_bit = k * 32;
int i = -1;
done = false;
do {
int j = find_next_bit(i, vid_map);
if (j > 0) {
/* first hit of any bit */
if (begin == UINT16_MAX && end == UINT16_MAX) {
begin = end = j - 1 + base_bit;
untagged = is_bit_set(j - 1, untagged_map);
goto next;
}
/* this bit is a continuation of prior bits */
if (j - 2 + base_bit == end && untagged == is_bit_set(j - 1, untagged_map) && (uint16_t)j - 1 + base_bit != pvid && (uint16_t)begin != pvid) {
end++;
goto next;
}
} else
done = true;
if (begin != UINT16_MAX) {
cnt++;
if (done && k < BRIDGE_VLAN_BITMAP_LEN - 1)
break;
br_vlan.flags = 0;
if (untagged)
br_vlan.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
if (begin == end) {
br_vlan.vid = begin;
if (begin == pvid)
br_vlan.flags |= BRIDGE_VLAN_INFO_PVID;
r = sd_netlink_message_append_data(req, IFLA_BRIDGE_VLAN_INFO, &br_vlan, sizeof(br_vlan));
if (r < 0)
return r;
} else {
br_vlan.vid = begin;
br_vlan.flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
r = sd_netlink_message_append_data(req, IFLA_BRIDGE_VLAN_INFO, &br_vlan, sizeof(br_vlan));
if (r < 0)
return r;
br_vlan.vid = end;
br_vlan.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
br_vlan.flags |= BRIDGE_VLAN_INFO_RANGE_END;
r = sd_netlink_message_append_data(req, IFLA_BRIDGE_VLAN_INFO, &br_vlan, sizeof(br_vlan));
if (r < 0)
return r;
}
if (done)
break;
}
if (j > 0) {
begin = end = j - 1 + base_bit;
untagged = is_bit_set(j - 1, untagged_map);
}
next:
i = j;
} while (!done);
}
assert(cnt > 0);
return cnt;
}
void network_adjust_bridge_vlan(Network *network) {
assert(network);
if (!network->use_br_vlan)
return;
/* pvid might not be in br_vid_bitmap yet */
if (network->pvid)
set_bit(network->pvid, network->br_vid_bitmap);
}
int config_parse_brvlan_pvid(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
uint16_t pvid;
int r;
r = parse_vlanid(rvalue, &pvid);
if (r < 0)
return r;
network->pvid = pvid;
network->use_br_vlan = true;
return 0;
}
int config_parse_brvlan_vlan(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
uint16_t vid, vid_end;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = parse_vid_range(rvalue, &vid, &vid_end);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse VLAN, ignoring: %s", rvalue);
return 0;
}
for (; vid <= vid_end; vid++)
set_bit(vid, network->br_vid_bitmap);
network->use_br_vlan = true;
return 0;
}
int config_parse_brvlan_untagged(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
uint16_t vid, vid_end;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = parse_vid_range(rvalue, &vid, &vid_end);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r, "Could not parse VLAN: %s", rvalue);
return 0;
}
for (; vid <= vid_end; vid++) {
set_bit(vid, network->br_vid_bitmap);
set_bit(vid, network->br_untagged_bitmap);
}
network->use_br_vlan = true;
return 0;
}
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