Hi Pacien,
On Thu, 13 Apr 2023 at 12:57, pacien <[email protected]> wrote:
>
> From: pacien <[email protected]>
>
> This adds a command line option (-K) to set the (kernel) packet
> priority. The option is part of "FEATURE_UDHCPC_SK_PRIO".
>
> This makes it straightforward to set some VLAN priority for DHCP
> requests through an egress QoS map. Packet matching for firewall
> or scheduler marking is otherwise broken due to the use of raw
> packets.
>
> (Such priority tag is a hard requirement for some ISPs, such as Orange
> in France).
>
> Enabling this feature costs 264 octets according to bloatcheck.
>
> Co-authored-by: Clément Péron <[email protected]>
> Signed-off-by: Pacien TRAN-GIRARD <[email protected]>
> ---
> Differences from Pacien's v1 and Clément's v2:
> * made it clear that we're only talking about the kernel packet priority
> (CoS or SKB were ambiguous or unclear)
>
> Differences from Clément's v2:
> * renamed the flag to -K to match the new terminology
> * moved sk_prio to client_data, passed as params instead of a global
> * used the same error handling as in the send_packet functions
>
> networking/udhcp/Config.src | 10 ++++++++++
> networking/udhcp/common.h | 6 ++++--
> networking/udhcp/d6_common.h | 2 ++
> networking/udhcp/d6_dhcpc.c | 26 +++++++++++++++++++-------
> networking/udhcp/d6_packet.c | 21 +++++++++++++++++++--
> networking/udhcp/dhcpc.c | 29 ++++++++++++++++++++---------
> networking/udhcp/dhcpc.h | 1 +
> networking/udhcp/dhcpd.c | 6 ++++--
> networking/udhcp/packet.c | 21 +++++++++++++++++++--
> 9 files changed, 98 insertions(+), 24 deletions(-)
>
> diff --git a/networking/udhcp/Config.src b/networking/udhcp/Config.src
> index 7ba7f48fc..731cf12fa 100644
> --- a/networking/udhcp/Config.src
> +++ b/networking/udhcp/Config.src
> @@ -176,3 +176,13 @@ config FEATURE_UDHCP_8021Q
> help
> If selected, both client and server will support passing of VLAN
> ID and priority via options 132 and 133 as per 802.1Q.
> +
> +config FEATURE_UDHCPC_SK_PRIO
> + bool "Enable '-K' option for udhcpc"
> + default y
> + depends on UDHCPC || UDHCPC6
> + help
> + If selected, enables -K option to set the kernel priority of DHCP
> + packets. Useful together with some egress QoS mapping to send
> + requests with a specific VLAN priority tag, as required by some
> + ISPs.
> diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
> index 49a0b593d..30ee68375 100644
> --- a/networking/udhcp/common.h
> +++ b/networking/udhcp/common.h
> @@ -359,12 +359,14 @@ int udhcp_recv_kernel_packet(struct dhcp_packet
> *packet, int fd) FAST_FUNC;
> int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
> uint32_t source_nip, int source_port,
> uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
> - int ifindex) FAST_FUNC;
> + int ifindex
> + IF_FEATURE_UDHCPC_SK_PRIO(, int sk_prio)) FAST_FUNC;
>
> int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
> uint32_t source_nip, int source_port,
> uint32_t dest_nip, int dest_port,
> - const char *ifname) FAST_FUNC;
> + const char *ifname
> + IF_FEATURE_UDHCPC_SK_PRIO(, int sk_prio)) FAST_FUNC;
>
> void udhcp_sp_setup(void) FAST_FUNC;
> void udhcp_sp_fd_set(struct pollfd *pfds, int extra_fd) FAST_FUNC;
> diff --git a/networking/udhcp/d6_common.h b/networking/udhcp/d6_common.h
> index 3cbfbb89e..05a5dc2b4 100644
> --- a/networking/udhcp/d6_common.h
> +++ b/networking/udhcp/d6_common.h
> @@ -180,12 +180,14 @@ int FAST_FUNC
> d6_send_raw_packet_from_client_data_ifindex(
> struct d6_packet *d6_pkt, unsigned d6_pkt_size,
> struct in6_addr *src_ipv6, int source_port,
> struct in6_addr *dst_ipv6, int dest_port, const uint8_t
> *dest_arp
> + IF_FEATURE_UDHCPC_SK_PRIO(, int sk_prio)
> );
>
> int FAST_FUNC d6_send_kernel_packet_from_client_data_ifindex(
> struct d6_packet *d6_pkt, unsigned d6_pkt_size,
> struct in6_addr *src_ipv6, int source_port,
> struct in6_addr *dst_ipv6, int dest_port
> + IF_FEATURE_UDHCPC_SK_PRIO(, int sk_prio)
> );
>
> #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
> diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
> index cdd06188e..173aa2914 100644
> --- a/networking/udhcp/d6_dhcpc.c
> +++ b/networking/udhcp/d6_dhcpc.c
> @@ -127,6 +127,7 @@ static const char udhcpc6_longopts[] ALIGN1 =
> USE_FOR_MMU(
> "background\0" No_argument "b"
> )
> + IF_FEATURE_UDHCPC_SK_PRIO("sk-priority\0" Required_argument
> "K")
> /// IF_FEATURE_UDHCPC_ARPING("arping\0" No_argument "a")
> IF_FEATURE_UDHCP_PORT("client-port\0" Required_argument "P")
> ;
> @@ -152,12 +153,14 @@ enum {
> OPT_d = 1 << 16,
> /* The rest has variable bit positions, need to be clever */
> OPTBIT_d = 16,
> - USE_FOR_MMU( OPTBIT_b,)
> - ///IF_FEATURE_UDHCPC_ARPING(OPTBIT_a,)
> - IF_FEATURE_UDHCP_PORT( OPTBIT_P,)
> - USE_FOR_MMU( OPT_b = 1 << OPTBIT_b,)
> - ///IF_FEATURE_UDHCPC_ARPING(OPT_a = 1 << OPTBIT_a,)
> - IF_FEATURE_UDHCP_PORT( OPT_P = 1 << OPTBIT_P,)
> + USE_FOR_MMU( OPTBIT_b,)
> + IF_FEATURE_UDHCPC_SK_PRIO(OPTBIT_K,)
> + ///IF_FEATURE_UDHCPC_ARPING( OPTBIT_a,)
> + IF_FEATURE_UDHCP_PORT( OPTBIT_P,)
> + USE_FOR_MMU( OPT_b = 1 << OPTBIT_b,)
> + IF_FEATURE_UDHCPC_SK_PRIO(OPT_K = 1 << OPTBIT_K,)
> + ///IF_FEATURE_UDHCPC_ARPING( OPT_a = 1 << OPTBIT_a,)
> + IF_FEATURE_UDHCP_PORT( OPT_P = 1 << OPTBIT_P,)
> };
>
> #if ENABLE_FEATURE_UDHCPC6_RFC4704
> @@ -561,6 +564,7 @@ static int d6_mcast_from_client_data_ifindex(struct
> d6_packet *packet, uint8_t *
> packet, (end - (uint8_t*) packet),
> /*src*/ &client6_data.ll_ip6, CLIENT_PORT6,
> /*dst*/ (struct in6_addr*)FF02__1_2, SERVER_PORT6,
> MAC_DHCP6MCAST_ADDR
> + IF_FEATURE_UDHCPC_SK_PRIO(, client_data.sk_prio)
> );
> }
>
> @@ -866,6 +870,7 @@ static NOINLINE int send_d6_renew(struct in6_addr
> *server_ipv6, struct in6_addr
> &packet, (opt_ptr - (uint8_t*) &packet),
> our_cur_ipv6, CLIENT_PORT6,
> server_ipv6, SERVER_PORT6
> + IF_FEATURE_UDHCPC_SK_PRIO(, client_data.sk_prio)
> );
> return d6_mcast_from_client_data_ifindex(&packet, opt_ptr);
> }
> @@ -899,6 +904,7 @@ int send_d6_release(struct in6_addr *server_ipv6, struct
> in6_addr *our_cur_ipv6)
> &packet, (opt_ptr - (uint8_t*) &packet),
> our_cur_ipv6, CLIENT_PORT6,
> server_ipv6, SERVER_PORT6
> + IF_FEATURE_UDHCPC_SK_PRIO(, client_data.sk_prio)
> );
> }
>
> @@ -1129,7 +1135,7 @@ static void client_background(void)
> //usage:# define IF_UDHCP_VERBOSE(...)
> //usage:#endif
> //usage:#define udhcpc6_trivial_usage
> -//usage: "[-fbq"IF_UDHCP_VERBOSE("v")"R] [-t N] [-T SEC] [-A SEC|-n]
> [-i IFACE] [-s PROG]\n"
> +//usage: "[-fbq"IF_UDHCP_VERBOSE("v")"R]"IF_FEATURE_UDHCPC_SK_PRIO("
> [-K PRIO]")" [-t N] [-T SEC] [-A SEC|-n] [-i IFACE] [-s PROG]\n"
> //usage: " [-p PIDFILE]"IF_FEATURE_UDHCP_PORT(" [-P PORT]")"
> [-ldo] [-r IPv6] [-x OPT:VAL]... [-O OPT]..."
> //usage:#define udhcpc6_full_usage "\n"
> //usage: "\n -i IFACE Interface to use (default
> "CONFIG_UDHCPC_DEFAULT_INTERFACE")"
> @@ -1150,6 +1156,9 @@ static void client_background(void)
> //usage: IF_FEATURE_UDHCP_PORT(
> //usage: "\n -P PORT Use PORT (default 546)"
> //usage: )
> +//usage: IF_FEATURE_UDHCPC_SK_PRIO(
> +//usage: "\n -K PRIO Set kernel packet priority (default
> 0)"
> +//usage: )
> ////usage: IF_FEATURE_UDHCPC_ARPING(
> ////usage: "\n -a Use arping to validate offered
> address"
> ////usage: )
> @@ -1199,6 +1208,7 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
> /* Default options */
> IF_FEATURE_UDHCP_PORT(SERVER_PORT6 = 547;)
> IF_FEATURE_UDHCP_PORT(CLIENT_PORT6 = 546;)
> + IF_FEATURE_UDHCPC_SK_PRIO(client_data.sk_prio = 0;)
> client_data.interface = CONFIG_UDHCPC_DEFAULT_INTERFACE;
> client_data.script = CONFIG_UDHCPC6_DEFAULT_SCRIPT;
> client_data.sockfd = -1;
> @@ -1212,6 +1222,7 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
> /* O,x: list; -T,-t,-A take numeric param */
> "i:np:qRr:s:T:+t:+SA:+O:*ox:*fld"
> USE_FOR_MMU("b")
> + IF_FEATURE_UDHCPC_SK_PRIO("K:+")
> ///IF_FEATURE_UDHCPC_ARPING("a")
> IF_FEATURE_UDHCP_PORT("P:")
> "v"
> @@ -1222,6 +1233,7 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
> , &discover_timeout, &discover_retries, &tryagain_timeout /*
> T,t,A */
> , &list_O
> , &list_x
> + IF_FEATURE_UDHCPC_SK_PRIO(, &client_data.sk_prio)
> IF_FEATURE_UDHCP_PORT(, &str_P)
> IF_UDHCP_VERBOSE(, &dhcp_verbose)
> );
> diff --git a/networking/udhcp/d6_packet.c b/networking/udhcp/d6_packet.c
> index 142de9b43..501497154 100644
> --- a/networking/udhcp/d6_packet.c
> +++ b/networking/udhcp/d6_packet.c
> @@ -54,7 +54,8 @@ int FAST_FUNC d6_recv_kernel_packet(struct in6_addr
> *peer_ipv6 UNUSED_PARAM,
> int FAST_FUNC d6_send_raw_packet_from_client_data_ifindex(
> struct d6_packet *d6_pkt, unsigned d6_pkt_size,
> struct in6_addr *src_ipv6, int source_port,
> - struct in6_addr *dst_ipv6, int dest_port, const uint8_t
> *dest_arp)
> + struct in6_addr *dst_ipv6, int dest_port, const uint8_t
> *dest_arp
> + IF_FEATURE_UDHCPC_SK_PRIO(, int sk_prio))
> {
> struct sockaddr_ll dest_sll;
> struct ip6_udp_d6_packet packet;
> @@ -68,6 +69,13 @@ int FAST_FUNC d6_send_raw_packet_from_client_data_ifindex(
> goto ret_msg;
> }
>
> +#if ENABLE_FEATURE_UDHCPC_SK_PRIO
> + if (setsockopt_SOL_SOCKET_int(fd, SO_PRIORITY, sk_prio) < 0) {
One difference is that it will call setsockopt even when sk_prio is
not set and default to '0'.
I don't know if this can have an impact, or maybe we should default
sk_prio to -1 and only call setsockopt_SOL_SOCKET_int() when it's >= 0
Regards,
Clement
> + msg = "setsockopt(%s)";
> + goto ret_close;
> + }
> +#endif
> +
> memset(&dest_sll, 0, sizeof(dest_sll));
> memset(&packet, 0, offsetof(struct ip6_udp_d6_packet, data));
> packet.data = *d6_pkt; /* struct copy */
> @@ -139,7 +147,8 @@ int FAST_FUNC d6_send_raw_packet_from_client_data_ifindex(
> int FAST_FUNC d6_send_kernel_packet_from_client_data_ifindex(
> struct d6_packet *d6_pkt, unsigned d6_pkt_size,
> struct in6_addr *src_ipv6, int source_port,
> - struct in6_addr *dst_ipv6, int dest_port)
> + struct in6_addr *dst_ipv6, int dest_port
> + IF_FEATURE_UDHCPC_SK_PRIO(, int sk_prio))
> {
> struct sockaddr_in6 sa;
> int fd;
> @@ -151,6 +160,14 @@ int FAST_FUNC
> d6_send_kernel_packet_from_client_data_ifindex(
> msg = "socket(%s)";
> goto ret_msg;
> }
> +
> +#if ENABLE_FEATURE_UDHCPC_SK_PRIO
> + if (setsockopt_SOL_SOCKET_int(fd, SO_PRIORITY, sk_prio) < 0) {
> + msg = "setsockopt(%s)";
> + goto ret_close;
> + }
> +#endif
> +
> setsockopt_reuseaddr(fd);
>
> memset(&sa, 0, sizeof(sa));
> diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
> index c757fb37c..8108f6856 100644
> --- a/networking/udhcp/dhcpc.c
> +++ b/networking/udhcp/dhcpc.c
> @@ -75,6 +75,7 @@ static const char udhcpc_longopts[] ALIGN1 =
> "background\0" No_argument "b"
> )
> "broadcast\0" No_argument "B"
> + IF_FEATURE_UDHCPC_SK_PRIO("sk-priority\0" Required_argument
> "K")
> IF_FEATURE_UDHCPC_ARPING("arping\0" Optional_argument "a")
> IF_FEATURE_UDHCP_PORT("client-port\0" Required_argument "P")
> ;
> @@ -102,12 +103,14 @@ enum {
> OPT_B = 1 << 18,
> /* The rest has variable bit positions, need to be clever */
> OPTBIT_B = 18,
> - USE_FOR_MMU( OPTBIT_b,)
> - IF_FEATURE_UDHCPC_ARPING(OPTBIT_a,)
> - IF_FEATURE_UDHCP_PORT( OPTBIT_P,)
> - USE_FOR_MMU( OPT_b = 1 << OPTBIT_b,)
> - IF_FEATURE_UDHCPC_ARPING(OPT_a = 1 << OPTBIT_a,)
> - IF_FEATURE_UDHCP_PORT( OPT_P = 1 << OPTBIT_P,)
> + USE_FOR_MMU( OPTBIT_b,)
> + IF_FEATURE_UDHCPC_SK_PRIO(OPTBIT_K,)
> + IF_FEATURE_UDHCPC_ARPING( OPTBIT_a,)
> + IF_FEATURE_UDHCP_PORT( OPTBIT_P,)
> + USE_FOR_MMU( OPT_b = 1 << OPTBIT_b,)
> + IF_FEATURE_UDHCPC_SK_PRIO(OPT_K = 1 << OPTBIT_K,)
> + IF_FEATURE_UDHCPC_ARPING( OPT_a = 1 << OPTBIT_a,)
> + IF_FEATURE_UDHCP_PORT( OPT_P = 1 << OPTBIT_P,)
> };
>
>
> @@ -704,7 +707,8 @@ static int raw_bcast_from_client_data_ifindex(struct
> dhcp_packet *packet, uint32
> return udhcp_send_raw_packet(packet,
> /*src*/ src_nip, CLIENT_PORT,
> /*dst*/ INADDR_BROADCAST, SERVER_PORT, MAC_BCAST_ADDR,
> - client_data.ifindex);
> + client_data.ifindex
> + IF_FEATURE_UDHCPC_SK_PRIO(, client_data.sk_prio));
> }
>
> static int bcast_or_ucast(struct dhcp_packet *packet, uint32_t ciaddr,
> uint32_t server)
> @@ -713,7 +717,8 @@ static int bcast_or_ucast(struct dhcp_packet *packet,
> uint32_t ciaddr, uint32_t
> return udhcp_send_kernel_packet(packet,
> ciaddr, CLIENT_PORT,
> server, SERVER_PORT,
> - client_data.interface);
> + client_data.interface
> + IF_FEATURE_UDHCPC_SK_PRIO(, client_data.sk_prio));
> return raw_bcast_from_client_data_ifindex(packet, ciaddr);
> }
>
> @@ -1161,7 +1166,7 @@ static void client_background(void)
> //usage:# define IF_UDHCP_VERBOSE(...)
> //usage:#endif
> //usage:#define udhcpc_trivial_usage
> -//usage: "[-fbq"IF_UDHCP_VERBOSE("v")"RB]"IF_FEATURE_UDHCPC_ARPING("
> [-a[MSEC]]")" [-t N] [-T SEC] [-A SEC|-n]\n"
> +//usage: "[-fbq"IF_UDHCP_VERBOSE("v")"RB]"IF_FEATURE_UDHCPC_SK_PRIO("
> [-K PRIO]")IF_FEATURE_UDHCPC_ARPING(" [-a[MSEC]]")" [-t N] [-T SEC] [-A
> SEC|-n]\n"
> //usage: " [-i IFACE]"IF_FEATURE_UDHCP_PORT(" [-P PORT]")" [-s
> PROG] [-p PIDFILE]\n"
> //usage: " [-oC] [-r IP] [-V VENDOR] [-F NAME] [-x OPT:VAL]...
> [-O OPT]..."
> //usage:#define udhcpc_full_usage "\n"
> @@ -1183,6 +1188,9 @@ static void client_background(void)
> //usage: "\n -R Release IP on exit"
> //usage: "\n -f Run in foreground"
> //usage: "\n -S Log to syslog too"
> +//usage: IF_FEATURE_UDHCPC_SK_PRIO(
> +//usage: "\n -K PRIO Set kernel packet priority (default
> 0)"
> +//usage: )
> //usage: IF_FEATURE_UDHCPC_ARPING(
> //usage: "\n -a[MSEC] Validate offered address with ARP
> ping"
> //usage: )
> @@ -1232,6 +1240,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
> /* Default options */
> IF_FEATURE_UDHCP_PORT(SERVER_PORT = 67;)
> IF_FEATURE_UDHCP_PORT(CLIENT_PORT = 68;)
> + IF_FEATURE_UDHCPC_SK_PRIO(client_data.sk_prio = 0;)
> client_data.interface = CONFIG_UDHCPC_DEFAULT_INTERFACE;
> client_data.script = CONFIG_UDHCPC_DEFAULT_SCRIPT;
> client_data.sockfd = -1;
> @@ -1246,6 +1255,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
> /* O,x: list; -T,-t,-A take numeric param */
> "CV:F:i:np:qRr:s:T:+t:+SA:+O:*ox:*fB"
> USE_FOR_MMU("b")
> + IF_FEATURE_UDHCPC_SK_PRIO("K:+")
> IF_FEATURE_UDHCPC_ARPING("a::")
> IF_FEATURE_UDHCP_PORT("P:")
> "v"
> @@ -1258,6 +1268,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
> , &discover_timeout, &discover_retries, &tryagain_timeout /*
> T,t,A */
> , &list_O
> , &list_x
> + IF_FEATURE_UDHCPC_SK_PRIO(, &client_data.sk_prio)
> IF_FEATURE_UDHCPC_ARPING(, &str_a)
> IF_FEATURE_UDHCP_PORT(, &str_P)
> IF_UDHCP_VERBOSE(, &dhcp_verbose)
> diff --git a/networking/udhcp/dhcpc.h b/networking/udhcp/dhcpc.h
> index 19b054b32..733491953 100644
> --- a/networking/udhcp/dhcpc.h
> +++ b/networking/udhcp/dhcpc.h
> @@ -9,6 +9,7 @@ PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
>
> struct client_data_t {
> uint8_t client_mac[6]; /* Our mac address */
> + IF_FEATURE_UDHCPC_SK_PRIO(int sk_prio;)
> IF_FEATURE_UDHCP_PORT(uint16_t port;)
> int ifindex; /* Index number of the interface to
> use */
> uint32_t xid;
> diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
> index 66750e2e6..814b791b0 100644
> --- a/networking/udhcp/dhcpd.c
> +++ b/networking/udhcp/dhcpd.c
> @@ -603,7 +603,8 @@ static void send_packet_to_client(struct dhcp_packet
> *dhcp_pkt, int force_broadc
> udhcp_send_raw_packet(dhcp_pkt,
> /*src*/ server_data.server_nip, SERVER_PORT,
> /*dst*/ ciaddr, CLIENT_PORT, chaddr,
> - server_data.ifindex);
> + server_data.ifindex
> + IF_FEATURE_UDHCPC_SK_PRIO(, 0));
> }
>
> /* Send a packet to gateway_nip using the kernel ip stack */
> @@ -618,7 +619,8 @@ static void send_packet_to_relay(struct dhcp_packet
> *dhcp_pkt)
> * even those which are clients' requests and would normally
> * (i.e. without relay) use CLIENT_PORT. See RFC 1542.
> */
> - server_data.interface);
> + server_data.interface
> + IF_FEATURE_UDHCPC_SK_PRIO(, 0));
> }
>
> static void send_packet(struct dhcp_packet *dhcp_pkt, int force_broadcast)
> diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
> index 529978189..9cd2beafe 100644
> --- a/networking/udhcp/packet.c
> +++ b/networking/udhcp/packet.c
> @@ -106,7 +106,8 @@ int FAST_FUNC udhcp_recv_kernel_packet(struct dhcp_packet
> *packet, int fd)
> int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
> uint32_t source_nip, int source_port,
> uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
> - int ifindex)
> + int ifindex
> + IF_FEATURE_UDHCPC_SK_PRIO(, int sk_prio))
> {
> struct sockaddr_ll dest_sll;
> struct ip_udp_dhcp_packet packet;
> @@ -121,6 +122,13 @@ int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet
> *dhcp_pkt,
> goto ret_msg;
> }
>
> +#if ENABLE_FEATURE_UDHCPC_SK_PRIO
> + if (setsockopt_SOL_SOCKET_int(fd, SO_PRIORITY, sk_prio) < 0) {
> + msg = "setsockopt(%s)";
> + goto ret_close;
> + }
> +#endif
> +
> memset(&dest_sll, 0, sizeof(dest_sll));
> memset(&packet, 0, offsetof(struct ip_udp_dhcp_packet, data));
> packet.data = *dhcp_pkt; /* struct copy */
> @@ -192,7 +200,8 @@ int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet
> *dhcp_pkt,
> int FAST_FUNC udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
> uint32_t source_nip, int source_port,
> uint32_t dest_nip, int dest_port,
> - const char *ifname)
> + const char *ifname
> + IF_FEATURE_UDHCPC_SK_PRIO(, int sk_prio))
> {
> struct sockaddr_in sa;
> unsigned padding;
> @@ -205,6 +214,14 @@ int FAST_FUNC udhcp_send_kernel_packet(struct
> dhcp_packet *dhcp_pkt,
> msg = "socket(%s)";
> goto ret_msg;
> }
> +
> +#if ENABLE_FEATURE_UDHCPC_SK_PRIO
> + if (setsockopt_SOL_SOCKET_int(fd, SO_PRIORITY, sk_prio) < 0) {
> + msg = "setsockopt(%s)";
> + goto ret_close;
> + }
> +#endif
> +
> setsockopt_reuseaddr(fd);
>
> /* If interface carrier goes down, unless we
> --
> 2.38.4
>
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