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rtnlutil: Add connected and gateway route API

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The API allows to add connected and gateway routes to the main
routing table.

rtnl_route_ipv4_add_gateway() is equivalent to the following
example 'ip route' command:
ip route add default via 10.0.0.1 dev wlan0 proto dhcp src 10.0.0.2 metric 339

rtnl_route_ipv4_add_connected()  is equivalent to the following
example 'ip route' command:
sudo ip route add 10.0.0.0/24 dev wlan0 proto dhcp src 10.0.0.2 scope link

The 'ip route' output from the above commands looks as follows:

rtnl_route_ipv4_add_connected():
10.0.0.0/24 dev wlan0 proto dhcp scope link src 10.0.0.2

rtnl_route_ipv4_add_gateway():
default via 10.0.0.1 dev wlan0 proto dhcp src 10.0.0.2 metric 339
This commit is contained in:
Tim Kourt 2019-07-30 18:16:11 -07:00 committed by Denis Kenzior
parent a91136d4b9
commit cce59ad7f1
2 changed files with 137 additions and 0 deletions
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124
src/rtnlutil.c
View File

@ -43,6 +43,17 @@ static size_t rta_add_u8(void *rta_buf, unsigned short type, uint8_t value)
return RTA_SPACE(sizeof(uint8_t));
}
static size_t rta_add_u32(void *rta_buf, unsigned short type, uint32_t value)
{
struct rtattr *rta = rta_buf;
rta->rta_len = RTA_LENGTH(sizeof(uint32_t));
rta->rta_type = type;
*((uint32_t *) RTA_DATA(rta)) = value;
return RTA_SPACE(sizeof(uint32_t));
}
static size_t rta_add_data(void *rta_buf, unsigned short type, void *data,
size_t data_len)
{
@ -309,3 +320,116 @@ uint32_t rtnl_route_dump_ipv4(struct l_netlink *rtnl,
sizeof(struct rtmsg), cb, user_data,
destroy);
}
static uint32_t rtnl_route_add(struct l_netlink *rtnl, int ifindex,
uint8_t scope, uint8_t dst_len,
const char *dst, const char *gateway,
const char *src,
uint32_t priority_offset, uint8_t proto,
l_netlink_command_func_t cb,
void *user_data,
l_netlink_destroy_func_t destroy)
{
struct rtmsg *rtmmsg;
struct in_addr in_addr;
size_t bufsize;
void *rta_buf;
uint32_t id;
uint16_t flags;
if (!dst && !gateway)
return 0;
bufsize = NLMSG_ALIGN(sizeof(struct rtmsg)) +
RTA_SPACE(sizeof(uint32_t)) +
(priority_offset ? RTA_SPACE(sizeof(uint32_t)) : 0) +
(gateway ? RTA_SPACE(sizeof(struct in_addr)) : 0) +
(src ? RTA_SPACE(sizeof(struct in_addr)) : 0) +
(dst ? RTA_SPACE(sizeof(struct in_addr)) : 0);
rtmmsg = l_malloc(bufsize);
memset(rtmmsg, 0, bufsize);
rtmmsg->rtm_family = AF_INET;
rtmmsg->rtm_table = RT_TABLE_MAIN;
rtmmsg->rtm_protocol = proto;
rtmmsg->rtm_type = RTN_UNICAST;
rtmmsg->rtm_scope = scope;
flags = NLM_F_CREATE | NLM_F_REPLACE;
rta_buf = (void *) rtmmsg + NLMSG_ALIGN(sizeof(struct rtmsg));
rta_buf += rta_add_u32(rta_buf, RTA_OIF, ifindex);
if (priority_offset)
rta_buf += rta_add_u32(rta_buf, RTA_PRIORITY,
priority_offset + ifindex);
if (dst) {
if (inet_pton(AF_INET, dst, &in_addr) < 1) {
l_free(rtmmsg);
return 0;
}
rtmmsg->rtm_dst_len = dst_len;
rta_buf += rta_add_data(rta_buf, RTA_DST, &in_addr,
sizeof(struct in_addr));
}
if (gateway) {
if (inet_pton(AF_INET, gateway, &in_addr) < 1) {
l_free(rtmmsg);
return 0;
}
rta_buf += rta_add_data(rta_buf, RTA_GATEWAY, &in_addr,
sizeof(struct in_addr));
}
if (src) {
if (inet_pton(AF_INET, src, &in_addr) < 1) {
l_free(rtmmsg);
return 0;
}
rtmmsg->rtm_src_len = 32;
rta_buf += rta_add_data(rta_buf, RTA_PREFSRC, &in_addr,
sizeof(struct in_addr));
}
id = l_netlink_send(rtnl, RTM_NEWROUTE, flags, rtmmsg,
rta_buf - (void *) rtmmsg, cb, user_data,
destroy);
l_free(rtmmsg);
return id;
}
uint32_t rtnl_route_ipv4_add_connected(struct l_netlink *rtnl, int ifindex,
uint8_t dst_len, const char *dst,
const char *src, uint8_t proto,
l_netlink_command_func_t cb,
void *user_data,
l_netlink_destroy_func_t destroy)
{
return rtnl_route_add(rtnl, ifindex, RT_SCOPE_LINK, dst_len, dst, NULL,
src, 0, proto, cb, user_data, destroy);
}
uint32_t rtnl_route_ipv4_add_gateway(struct l_netlink *rtnl, int ifindex,
const char *gateway, const char *src,
uint32_t priority_offset,
uint8_t proto,
l_netlink_command_func_t cb,
void *user_data,
l_netlink_destroy_func_t destroy)
{
return rtnl_route_add(rtnl, ifindex, RT_SCOPE_UNIVERSE, 0, NULL,
gateway, src, priority_offset, proto, cb,
user_data, destroy);
}

13
src/rtnlutil.h
View File

@ -54,3 +54,16 @@ void rtnl_route_extract_ipv4(const struct rtmsg *rtmsg, uint32_t len,
uint32_t rtnl_route_dump_ipv4(struct l_netlink *rtnl,
l_netlink_command_func_t cb, void *user_data,
l_netlink_destroy_func_t destroy);
uint32_t rtnl_route_ipv4_add_connected(struct l_netlink *rtnl, int ifindex,
uint8_t dst_len, const char *dst,
const char *src, uint8_t proto,
l_netlink_command_func_t cb,
void *user_data,
l_netlink_destroy_func_t destroy);
uint32_t rtnl_route_ipv4_add_gateway(struct l_netlink *rtnl, int ifindex,
const char *gateway, const char *src,
uint32_t priority_offset,
uint8_t proto,
l_netlink_command_func_t cb,
void *user_data,
l_netlink_destroy_func_t destroy);