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main.c
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/*
*
* Copyright 2023 Kenichi Yasukata
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/* configuration */
#ifndef IIP_CONF_ENDIAN
#define IIP_CONF_ENDIAN (1) /* little 1, big 2 */
#endif
/* TODO: properly configure them */
#ifndef IIP_CONF_IP4_TTL
#define IIP_CONF_IP4_TTL (64)
#endif
#ifndef IIP_CONF_TCP_OPT_WS
#define IIP_CONF_TCP_OPT_WS (7U) /* RFC 7323 : between 0 ~ 14 */ /* TODO: how to determine this ? */
#endif
#ifndef IIP_CONF_TCP_OPT_MSS
#define IIP_CONF_TCP_OPT_MSS (1460U)
#endif
#ifndef IIP_CONF_TCP_OPT_SACK_OK
#define IIP_CONF_TCP_OPT_SACK_OK (1U)
#endif
#ifndef IIP_CONF_TCP_RX_BUF_CNT
#define IIP_CONF_TCP_RX_BUF_CNT (512U) /* should be smaller than 735439 (1GB with 1460 mss) : limit by RFC 7323 */
#endif
#ifndef IIP_CONF_TCP_WIN_INIT
#define IIP_CONF_TCP_WIN_INIT (1)
#endif
#ifndef IIP_CONF_TCP_MSL_SEC
#define IIP_CONF_TCP_MSL_SEC (1) /* maximum segment lifetime, in second : RFC 793 recommends 2 min, but we can choose as we wish */
#endif
#ifndef IIP_CONF_TCP_RETRANS_CNT
#define IIP_CONF_TCP_RETRANS_CNT (4) /* maximum retransmission count */
#endif
#ifndef IIP_CONF_TCP_SSTHRESH_INIT
#define IIP_CONF_TCP_SSTHRESH_INIT (256)
#endif
#ifndef IIP_CONF_TCP_CONN_HT_SIZE
#define IIP_CONF_TCP_CONN_HT_SIZE (829) /* generally bigger is faster at the cost of memory consumption */
#endif
#ifndef IIP_CONF_TCP_TIMESTAMP_ENABLE
#define IIP_CONF_TCP_TIMESTAMP_ENABLE (1)
#endif
#ifndef IIP_CONF_L2ADDR_LEN_MAX
#define IIP_CONF_L2ADDR_LEN_MAX (6)
#endif
/* functions implemented by app and io subsystems */
static void *iip_ops_pkt_alloc(void *);
static void iip_ops_pkt_free(void *, void *);
static void *iip_ops_pkt_get_data(void *, void *);
static uint16_t iip_ops_pkt_get_len(void *, void *);
static void iip_ops_pkt_set_len(void *, uint16_t, void *);
static void iip_ops_pkt_increment_head(void *, uint16_t, void *);
static void iip_ops_pkt_decrement_tail(void *, uint16_t, void *);
static void *iip_ops_pkt_clone(void *, void *); /* assuming the entire packet chain is cloned while reference counts to the payload buffers are also incremented */
static void iip_ops_pkt_scatter_gather_chain_append(void *, void *, void *);
static void *iip_ops_pkt_scatter_gather_chain_get_next(void *, void *);
static uint16_t iip_ops_l2_hdr_len(void *, void *);
static uint8_t *iip_ops_l2_hdr_src_ptr(void *, void *);
static uint8_t *iip_ops_l2_hdr_dst_ptr(void *, void *);
static uint16_t iip_ops_l2_ethertype_be(void *, void *);
static uint16_t iip_ops_l2_addr_len(void *);
static void iip_ops_l2_broadcast_addr(uint8_t [], void *);
static void iip_ops_l2_hdr_craft(void *, uint8_t [], uint8_t [], uint16_t, void *);
static uint8_t iip_ops_l2_skip(void *, void *);
static void iip_ops_l2_flush(void *);
static void iip_ops_l2_push(void *, void *); /* assuming packet object is released by app */
static uint8_t iip_ops_arp_lhw(void *);
static uint8_t iip_ops_arp_lproto(void *);
static void iip_ops_arp_reply(void *, void *, void *);
static void iip_ops_icmp_reply(void *, void *, void *);
static uint8_t iip_ops_tcp_accept(void *, void *, void *);
static void *iip_ops_tcp_accepted(void *, void *, void *, void *);
static void *iip_ops_tcp_connected(void *, void *, void *, void *);
static void iip_ops_tcp_closed(void *, uint8_t [], uint32_t, uint16_t, uint8_t [], uint32_t, uint16_t, void *, void *);
static void iip_ops_tcp_payload(void *, void *, void *, void *, uint16_t, uint16_t, void *);
static void iip_ops_tcp_acked(void *, void *, void *, void *, void *);
static void iip_ops_udp_payload(void *, void *, void *);
static uint8_t iip_ops_nic_feature_offload_tx_scatter_gather(void *);
static uint8_t iip_ops_nic_feature_offload_ip4_rx_checksum(void *);
static uint8_t iip_ops_nic_feature_offload_ip4_tx_checksum(void *);
static uint8_t iip_ops_nic_feature_offload_tcp_rx_checksum(void *);
static uint8_t iip_ops_nic_feature_offload_tcp_tx_checksum(void *);
static uint8_t iip_ops_nic_feature_offload_tcp_tx_tso(void *);
static uint8_t iip_ops_nic_feature_offload_udp_rx_checksum(void *);
static uint8_t iip_ops_nic_feature_offload_udp_tx_checksum(void *);
static uint8_t iip_ops_nic_feature_offload_udp_tx_tso(void *);
static uint8_t iip_ops_nic_offload_ip4_rx_checksum(void *, void *);
static uint8_t iip_ops_nic_offload_udp_rx_checksum(void *, void *);
static uint8_t iip_ops_nic_offload_tcp_rx_checksum(void *, void *);
static void iip_ops_nic_offload_ip4_tx_checksum_mark(void *, void *);
static void iip_ops_nic_offload_tcp_tx_checksum_mark(void *, void *);
static void iip_ops_nic_offload_tcp_tx_tso_mark(void *, void *);
static void iip_ops_nic_offload_udp_tx_checksum_mark(void *, void *);
static void iip_ops_nic_offload_udp_tx_tso_mark(void *, void *);
static void iip_ops_util_now_ns(uint32_t [3], void *);
/* utilities */
#define __iip_bsw16(_n) ((((_n) >> 8) | ((_n) << 8)) & 0xffff)
#define __iip_bsw32(_n) (((((_n) >> 24) & 0xff) | (((_n) >> 8) & 0xff00) | (((_n) << 8) & 0xff0000) | (((_n) << 24) & 0xff000000)) & 0xffffffff)
#if IIP_CONF_ENDIAN == 1
#define __iip_htons(_n) __iip_bsw16(_n)
#define __iip_htonl(_n) __iip_bsw32(_n)
#define __iip_ntohs(_n) __iip_bsw16(_n)
#define __iip_ntohl(_n) __iip_bsw32(_n)
#elif IIP_CONF_ENDIAN == 2
#define __iip_htons(_n) (_n)
#define __iip_htonl(_n) (_n)
#define __iip_ntohs(_n) (_n)
#define __iip_ntohl(_n) (_n)
#else
#error "invalid IIP_CONF_ENDIAN: it should be either 1 (little) or 2 (big)"
#endif
#ifndef __iip_memcpy
#define __iip_memcpy(__dest, __src, __n) \
do { \
uint32_t __i; \
for (__i = 0; __i < (uint32_t)(__n); __i++) \
((uint8_t *) __dest)[__i] = ((uint8_t *) __src)[__i]; \
} while (0)
#endif
#ifndef __iip_memset
#define __iip_memset(__s, __c, __n) \
do { \
uint32_t __i; \
for (__i = 0; __i < (uint32_t)(__n); __i++) \
((uint8_t *) __s)[__i] = __c; \
} while (0)
#endif
#ifndef __iip_memcmp
static uint32_t __iip_memcmp_impl(void *__s1, void *__s2, uint32_t __n)
{
uint32_t __i = 0, ret = 0;
for (__i = 0; __i < (uint32_t)(__n); __i++) {
if (((uint8_t *) __s1)[__i] != ((uint8_t *) __s2)[__i]) {
ret = __i + 1;
break;
}
}
return ret;
}
#define __iip_memcmp(__s1, __s2, __n) __iip_memcmp_impl(__s1, __s2, __n)
#endif
#ifndef __iip_memmove
#define __iip_memmove(__dst, __src, __n) \
do { \
if ((uintptr_t) (__dst) > (uintptr_t) (__src)) { \
uint32_t __i = 0; \
for (__i = (uint32_t)(__n) - 1; __i != (uint32_t) -1; __i--) { \
((uint8_t *) (__dst))[__i] = ((uint8_t *) (__src))[__i]; \
} \
} else if ((uintptr_t) (__dst) < (uintptr_t) (__src)) { \
uint32_t __i = 0; \
for (__i = 0; __i < (uint32_t)(__n); __i++) { \
((uint8_t *) (__dst))[__i] = ((uint8_t *) (__src))[__i]; \
} \
} \
} while (0)
#endif
#ifndef __iip_assert
#define __iip_assert(_cond) \
do { \
if (!(_cond)) { \
IIP_OPS_DEBUG_PRINTF("[%s:%u]: assertion fail\n", __FILE__, __LINE__); \
while (1) ; \
} \
} while (0)
#endif
static uint16_t __iip_netcsum16(uint8_t *__b[], uint16_t __l[], uint16_t __c, uint16_t __m)
{
uint32_t __r = 0; uint16_t __n; uint8_t __k;
for (__n = 0, __k = 0; __n < (__c); __n++) {
uint32_t __i, __o = __k;
for (__i = __k; __i < (__l)[__n]; ) {
if ((__k == 1) || ((__l)[__n] - __i == 1)) {
uint16_t __v = ((uint8_t *)((__b)[__n]))[__i] & 0x00ff;
if (__k == 0) {
__v <<= 8;
__k = 1;
} else {
__k = 0;
}
__r += __v;
__i += 1;
} else {
uint16_t __v = ((uint16_t *)((__b)[__n]))[__i / 2 + __o];
__r += __iip_htons(__v);
__i += 2;
}
}
}
__r -= (__m);
__r = (__r >> 16) + (__r & 0x0000ffff);
__r = (__r >> 16) + __r;
return (uint16_t)~((uint16_t) __r);
}
static uint16_t __iip_compute_tcp_win_be(uint32_t num_buf, uint16_t mss, uint8_t ws)
{
uint32_t w;
if ((0xffffffff / mss) <= num_buf)
w = 0xffffffff;
else
w = num_buf * mss;
w >>= ws;
if (0xffff <= w)
w = 0xffff;
return __iip_htons((uint16_t) w);
}
#define __iip_round_up(_v, _r) ((((_v) / (_r)) + ((_v) % (_r) ? 1 : 0)) * (_r))
#define __iip_dequeue_obj(__queue, __obj, __x) \
do { \
if ((__queue)[0] == (__obj)) \
(__queue)[0] = (__obj)->next[__x]; \
if ((__queue)[1] == (__obj)) \
(__queue)[1] = (__obj)->prev[__x]; \
if ((__obj)->prev[__x]) \
(__obj)->prev[__x]->next[__x] = (__obj)->next[__x]; \
if ((__obj)->next[__x]) \
(__obj)->next[__x]->prev[__x] = (__obj)->prev[__x]; \
(__obj)->prev[__x] = (__obj)->next[__x] = NULL; \
} while (0)
#define __iip_enqueue_obj(__queue, __obj, __x) \
do { \
(__obj)->prev[__x] = (__obj)->next[__x] = NULL; \
if (!((__queue)[0])) { \
(__queue)[0] = (__queue)[1] = (__obj); \
} else { \
(__obj)->next[__x] = NULL; \
(__obj)->prev[__x] = (__queue)[1]; \
(__queue)[1]->next[__x] = (__obj); \
(__queue)[1] = (__obj); \
} \
} while (0)
#define __iip_q_for_each_safe(__queue, _i, _n, __x) \
for ((_i) = (__queue)[0], _n = ((_i) ? _i->next[__x] : (NULL)); (_i); (_i) = _n, _n = ((_i) ? (_i)->next[__x] : (NULL)))
#define __iip_q_for_each_safe_reverse(__queue, _i, _n, __x) \
for ((_i) = (__queue)[1], _n = ((_i) ? _i->prev[__x] : (NULL)); (_i); (_i) = _n, _n = ((_i) ? (_i)->prev[__x] : (NULL)))
/* protocol headers */
struct iip_ip4_hdr {
uint8_t vl;
uint8_t tos;
uint16_t len_be;
uint16_t id_be;
uint16_t off_be;
uint8_t ttl;
uint8_t proto;
uint16_t csum_be;
uint32_t src_be;
uint32_t dst_be;
};
struct iip_arp_hdr {
uint16_t hw_be;
uint16_t proto_be;
uint8_t lhw;
uint8_t lproto;
uint16_t op_be;
};
struct iip_icmp_hdr {
uint8_t type;
uint8_t code;
uint16_t csum_be;
struct {
uint16_t id_be;
uint16_t seq_be;
} echo;
};
struct iip_l4_ip4_pseudo_hdr {
uint32_t ip4_src_be;
uint32_t ip4_dst_be;
uint8_t pad;
uint8_t proto;
uint16_t len_be;
};
struct iip_tcp_hdr {
uint16_t src_be;
uint16_t dst_be;
uint32_t seq_be;
uint32_t ack_seq_be;
uint16_t flags;
uint16_t win_be;
uint16_t csum_be;
uint16_t urg_p_be;
};
struct iip_udp_hdr {
uint16_t src_be;
uint16_t dst_be;
uint16_t len_be;
uint16_t csum_be;
};
#define PB_IP4(__b) ((struct iip_ip4_hdr *)((uintptr_t) (iip_ops_pkt_get_data((__b), opaque)) + iip_ops_l2_hdr_len((__b), opaque)))
#define PB_ARP(__b) ((struct iip_arp_hdr *)(PB_IP4(__b)))
#define PB_ARP_HW_SENDER(__b) ((uint8_t *)((uintptr_t) PB_ARP(__b) + sizeof(struct iip_arp_hdr)))
#define PB_ARP_IP_SENDER(__b) ((uint8_t *)((uintptr_t) PB_ARP_HW_SENDER(__b) + PB_ARP(__b)->lhw))
#define PB_ARP_HW_TARGET(__b) ((uint8_t *)((uintptr_t) PB_ARP_IP_SENDER(__b) + PB_ARP(__b)->lproto))
#define PB_ARP_IP_TARGET(__b) ((uint8_t *)((uintptr_t) PB_ARP_HW_TARGET(__b) + PB_ARP(__b)->lhw))
#define PB_ICMP(__b) ((struct iip_icmp_hdr *)((uintptr_t) PB_IP4(__b) + (PB_IP4(__b)->vl & 0x0f) * 4))
#define PB_ICMP_PAYLOAD(__b) ((uint8_t *)((uintptr_t) PB_ICMP(__b) + sizeof(struct iip_icmp_hdr)))
#define PB_ICMP_PAYLOAD_LEN(__b) ((uint16_t)(__iip_htons(PB_IP4(__b)->len_be) - (PB_IP4(__b)->vl & 0x0f) * 4 - sizeof(struct iip_icmp_hdr)))
#define PB_TCP(__b) ((struct iip_tcp_hdr *)((uintptr_t) PB_IP4(__b) + (PB_IP4(__b)->vl & 0x0f) * 4))
#define PB_TCP_HDR_LEN(__b) ((uint16_t) __iip_ntohs(PB_TCP(__b)->flags) >> 12)
#define PB_TCP_HDR_HAS_FIN(__b) ((((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)) & 0x01U) ? 1 : 0)
#define PB_TCP_HDR_HAS_SYN(__b) ((((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)) & 0x02U) ? 1 : 0)
#define PB_TCP_HDR_HAS_RST(__b) ((((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)) & 0x04U) ? 1 : 0)
#define PB_TCP_HDR_HAS_PSH(__b) ((((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)) & 0x08U) ? 1 : 0)
#define PB_TCP_HDR_HAS_ACK(__b) ((((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)) & 0x10U) ? 1 : 0)
#define PB_TCP_HDR_HAS_URG(__b) ((((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)) & 0x20U) ? 1 : 0)
#define PB_TCP_HDR_HAS_ECE(__b) ((((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)) & 0x40U) ? 1 : 0)
#define PB_TCP_HDR_HAS_CWR(__b) ((((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)) & 0x80U) ? 1 : 0)
#define PB_TCP_HDR_SET_LEN(__b, __l) do { PB_TCP(__b)->flags = (__iip_htons(((__l) << 12) | ((uint8_t)(__iip_ntohs(PB_TCP(__b)->flags) & 0x3fU)))); } while (0)
#define PB_TCP_HDR_SET_FLAGS(__b, __f) do { PB_TCP(__b)->flags = (PB_TCP(__b)->flags & __iip_htons(~0x3fU)) | __iip_htons(__f); } while (0)
#define PB_TCP_PAYLOAD(__b) ((uint8_t *)((uintptr_t) PB_TCP(__b) + PB_TCP_HDR_LEN(__b) * 4))
#define PB_TCP_PAYLOAD_LEN(__b) ((uint16_t)(__iip_htons(PB_IP4(__b)->len_be) - (PB_IP4(__b)->vl & 0x0f) * 4 - PB_TCP_HDR_LEN(__b) * 4))
#define PB_TCP_OPT(__b) ((uint8_t *)((uintptr_t) PB_TCP(__b) + sizeof(struct iip_tcp_hdr)))
#define PB_TCP_OPTLEN(__b) (PB_TCP_HDR_LEN(__b) * 4 - sizeof(struct iip_tcp_hdr))
#define PB_UDP(__b) ((struct iip_udp_hdr *)((uintptr_t) PB_IP4(__b) + (PB_IP4(__b)->vl & 0x0f) * 4))
#define PB_UDP_PAYLOAD(__b) ((uint8_t *)((uintptr_t) PB_UDP(__b) + sizeof(struct iip_udp_hdr)))
#define PB_UDP_PAYLOAD_LEN(__b) ((uint16_t)(__iip_ntohs(PB_UDP(__b)->len_be)) - sizeof(struct iip_udp_hdr))
/* data structures */
struct pb {
void *pkt;
void *buf;
void *ack_cb_pkt;
uint8_t flags;
#define __IIP_PB_FLAGS_NEED_ACK_CB_PKT_FREE (1U << 2)
#define __IIP_PB_FLAGS_OPT_HAS_TS (1U << 3)
#define __IIP_PB_FLAGS_SACKED (1U << 4)
#define __IIP_PB_FLAGS_SACK_REPLY_SEND_ALL (1U << 5)
void *orig_pkt; /* for no scatter gather mode */
uint32_t ts;
uint32_t a_cnt; /* arrival count */
struct {
uint32_t rto_ms;
uint16_t inc_head;
uint16_t dec_tail;
struct {
uint16_t sack_opt_off;
uint32_t ts[2];
} opt;
} tcp;
struct {
uint16_t to_be_updated;
struct {
uint16_t increment_head;
uint16_t decrement_tail;
} range[0xffff /* max frame size*/ / 512 /* minimum mtu */];
} clone;
struct pb *prev[1];
struct pb *next[1];
};
#define __IIP_TCP_STATE_CLOSED (1)
#define __IIP_TCP_STATE_SYN_SENT (2)
#define __IIP_TCP_STATE_SYN_RECVD (3)
#define __IIP_TCP_STATE_ESTABLISHED (4)
#define __IIP_TCP_STATE_CLOSING (5)
#define __IIP_TCP_STATE_FIN_WAIT1 (6)
#define __IIP_TCP_STATE_FIN_WAIT2 (7)
#define __IIP_TCP_STATE_TIME_WAIT (8)
#define __IIP_TCP_STATE_CLOSE_WAIT (9)
#define __IIP_TCP_STATE_LAST_ACK (10)
struct iip_tcp_conn {
uint8_t state;
uint16_t local_port_be;
uint16_t peer_port_be;
uint32_t local_ip4_be;
uint32_t peer_ip4_be;
uint8_t local_mac[IIP_CONF_L2ADDR_LEN_MAX];
uint8_t peer_mac[IIP_CONF_L2ADDR_LEN_MAX];
uint32_t seq_be;
uint32_t ack_seq_be;
uint16_t win_be;
/* management */
uint32_t acked_seq;
uint32_t ts; /* latest timestamp of peer host */
uint16_t peer_win;
uint32_t ack_seq_sent;
uint32_t seq_next_expected;
uint8_t dup_ack_received;
uint32_t time_wait_ts_ms;
uint32_t retrans_cnt;
uint8_t flags;
#define __IIP_TCP_CONN_FLAGS_PEER_RX_FAILED (1U << 5)
uint32_t do_ack_cnt;
uint32_t sent_seq_when_loss_detected;
uint32_t fin_ack_seq_be;
uint8_t ws;
uint8_t sack_ok;
uint16_t mss;
uint32_t a_cnt; /* arrival count */
struct { /* number of packet buffer (not in byte) for rx */
uint32_t limit; /* we should have 1GB (735439) as the max : 1GB / 1460 (mss) = 735439.6.. */
uint32_t used;
} rx_buf_cnt;
struct {
uint16_t ssthresh;
uint16_t win;
} cc; /* congestion control */
struct {
uint32_t srtt; /* smoothed RTT estimator */
uint32_t rttvar; /* smoothed mean RTT estimator */
} rtt;
void *opaque;
struct pb *tcp_sack_rx[2];
struct pb *head[5][2]; /* 0: rx, 1: tx, 2: tx sent, 3: tx retrans, 4: rx out-of-order */
struct iip_tcp_conn *prev[2];
struct iip_tcp_conn *next[2];
};
struct workspace {
struct {
struct pb *ip4_rx_fragment[2];
} queue;
struct {
uint32_t p_cnt;
struct pb *p[2];
struct iip_tcp_conn *conn[2];
} pool;
struct {
uint32_t prev_fast;
uint32_t prev_slow;
uint32_t prev_very_slow;
} timer;
struct {
uint32_t iss; /* initial send sequence number */
uint32_t pkt_ts;
struct iip_tcp_conn *conns[2];
struct iip_tcp_conn *conns_ht[IIP_CONF_TCP_CONN_HT_SIZE][2];
struct iip_tcp_conn *closed_conns[2];
} tcp;
struct {
uint32_t prev_print_ts;
struct {
uint32_t rx_pkt;
uint32_t rx_pkt_dupack;
uint32_t rx_pkt_keepalive;
uint32_t rx_pkt_winupdate;
uint32_t tx_pkt;
uint32_t tx_pkt_re;
uint32_t fc_stop;
uint32_t cc_stop;
uint32_t th_stop;
} tcp;
} monitor;
};
/* pb allocator */
static void __iip_free_pb(struct workspace *s, struct pb *p, void *opaque)
{
if (p->flags & __IIP_PB_FLAGS_NEED_ACK_CB_PKT_FREE)
iip_ops_pkt_free(p->ack_cb_pkt, opaque);
iip_ops_pkt_free(p->pkt, opaque);
if (p->orig_pkt)
iip_ops_pkt_free(p->orig_pkt, opaque);
__iip_memset(p, 0, sizeof(struct pb));
#define __iip_enqueue_obj_top(__queue, __obj, __x) \
do { \
(__obj)->prev[__x] = (__obj)->next[__x] = NULL; \
if (!((__queue)[0])) { \
(__queue)[0] = (__queue)[1] = (__obj); \
} else { \
(__queue)[0]->prev[__x] = (__obj); \
(__obj)->next[__x] = (__queue)[0]; \
(__queue)[0] = (__obj); \
} \
} while (0)
__iip_enqueue_obj_top(s->pool.p, p, 0);
#undef __iip_enqueue_obj_top
s->pool.p_cnt++;
}
static struct pb *__iip_alloc_pb(struct workspace *s, void *pkt, void *opaque)
{
struct pb *p = s->pool.p[0];
__iip_assert(p);
__iip_assert(pkt);
__iip_dequeue_obj(s->pool.p, p, 0);
p->pkt = pkt;
p->buf = iip_ops_pkt_get_data(p->pkt, opaque);
s->pool.p_cnt--;
return p;
}
static struct pb *__iip_clone_pb(struct workspace *s, struct pb *orig, void *opaque)
{
struct pb *p = s->pool.p[0];
__iip_assert(p);
__iip_dequeue_obj(s->pool.p, p, 0);
p->pkt = iip_ops_pkt_clone(orig->pkt, opaque);
__iip_assert(p->pkt);
if (orig->ack_cb_pkt) {
p->ack_cb_pkt = iip_ops_pkt_clone(orig->ack_cb_pkt, opaque);
__iip_assert(p->ack_cb_pkt);
}
if (orig->orig_pkt) {
p->orig_pkt = iip_ops_pkt_clone(orig->orig_pkt, opaque);
__iip_assert(p->orig_pkt);
}
p->buf = orig->buf;
p->flags = orig->flags;
p->ts = orig->ts;
p->a_cnt = orig->a_cnt;
__iip_memcpy(&p->tcp, &orig->tcp, sizeof(p->tcp));
__iip_memcpy(&p->clone, &orig->clone, sizeof(p->clone));
/* we do not touch queue entity */
s->pool.p_cnt--;
return p;
}
/* exported utilitiy functions */
static uint32_t iip_workspace_size(void)
{
return sizeof(struct workspace);
}
static uint32_t iip_pb_size(void)
{
return sizeof(struct pb);
}
static uint32_t iip_tcp_conn_size(void)
{
return sizeof(struct iip_tcp_conn);
}
static void iip_add_pb(void *_mem, void *_p)
{
__iip_enqueue_obj(((struct workspace *) _mem)->pool.p, (struct pb *) _p, 0);
((struct workspace *) _mem)->pool.p_cnt++;
}
static void iip_add_tcp_conn(void *_mem, void *_conn)
{
__iip_enqueue_obj(((struct workspace *) _mem)->pool.conn, (struct iip_tcp_conn *) _conn, 0);
}
/* protocol stack implementation */
static void iip_arp_request(void *_mem,
uint8_t local_mac[],
uint32_t local_ip4_be,
uint32_t target_ip4_be,
void *opaque)
{
void *out_pkt = iip_ops_pkt_alloc(opaque);
__iip_assert(out_pkt);
{
uint8_t bc_mac[IIP_CONF_L2ADDR_LEN_MAX];
iip_ops_l2_broadcast_addr(bc_mac, opaque);
iip_ops_l2_hdr_craft(out_pkt, local_mac, bc_mac, __iip_htons(0x0806), opaque);
}
{
struct iip_arp_hdr *arph = PB_ARP(out_pkt);
arph->hw_be = __iip_htons(0x0001);
arph->proto_be = __iip_htons(0x0800);
arph->lhw = iip_ops_arp_lhw(opaque);
arph->lproto = iip_ops_arp_lproto(opaque);
arph->op_be = __iip_htons(0x0001);
__iip_memcpy(PB_ARP_HW_SENDER(out_pkt), local_mac, 6);
__iip_memset(PB_ARP_HW_TARGET(out_pkt), 0, 6);
__iip_memcpy(PB_ARP_IP_SENDER(out_pkt), (uint8_t *) &local_ip4_be, 4);
__iip_memcpy(PB_ARP_IP_TARGET(out_pkt), (uint8_t *) &target_ip4_be, 4);
iip_ops_pkt_set_len(out_pkt, iip_ops_l2_hdr_len(out_pkt, opaque) + sizeof(struct iip_arp_hdr) + arph->lhw * 2 + arph->lproto * 2, opaque);
}
iip_ops_l2_push(out_pkt, opaque);
{ /* unused */
(void) _mem;
}
}
static uint16_t __iip_tcp_push(struct workspace *s,
struct iip_tcp_conn *conn, void *_pkt,
uint8_t syn, uint8_t ack, uint8_t fin, uint8_t rst,
uint16_t tcp_flags,
uint8_t *sackbuf, void *opaque)
{
void *pkt;
struct pb *out_p;
uint16_t total_payload_len = (_pkt ? iip_ops_pkt_get_len(_pkt, opaque) : 0), payload_len = total_payload_len, pushed_payload_len = 0, frag_cnt = 0;
again:
frag_cnt++;
pkt = _pkt;
out_p = __iip_alloc_pb(s, iip_ops_pkt_alloc(opaque), opaque);
if (!iip_ops_nic_feature_offload_tcp_tx_tso(opaque)) {
uint16_t l = (conn->mss < 536 ? 536 : conn->mss) - (0 /* size of ip option */ + __iip_round_up((syn ? 4 + 3 + (IIP_CONF_TCP_OPT_SACK_OK ? 2 : 0) : 0) + (sackbuf ? sackbuf[1] : 0) + (IIP_CONF_TCP_TIMESTAMP_ENABLE ? 12 : 0), 4)) /* size of tcp option */;
payload_len = (l < (uint16_t) (total_payload_len - pushed_payload_len) ? l : total_payload_len - pushed_payload_len);
if (payload_len != total_payload_len) {
__iip_assert((pkt = iip_ops_pkt_clone(_pkt, opaque)) != NULL);
iip_ops_pkt_increment_head(pkt, pushed_payload_len, opaque);
iip_ops_pkt_set_len(pkt, payload_len, opaque);
}
}
iip_ops_l2_hdr_craft(out_p->pkt, conn->local_mac, conn->peer_mac, __iip_htons(0x0800), opaque);
{
struct iip_ip4_hdr *ip4h = PB_IP4(out_p->pkt);
ip4h->vl = (4 /* ver ipv4 */ << 4) | (sizeof(struct iip_ip4_hdr) / 4 /* len in octet */);
ip4h->len_be = __iip_htons(sizeof(struct iip_ip4_hdr) + __iip_round_up(sizeof(struct iip_tcp_hdr) + (syn ? 4 + 3 + (IIP_CONF_TCP_OPT_SACK_OK ? 2 : 0) : 0) + (sackbuf ? sackbuf[1] : 0) + (IIP_CONF_TCP_TIMESTAMP_ENABLE ? 12 : 0), 4) + payload_len);
ip4h->tos = 0;
ip4h->id_be = 0; /* no ip4 fragment */
ip4h->off_be = 0; /* no ip4 fragment */
ip4h->ttl = IIP_CONF_IP4_TTL;
ip4h->proto = 6; /* tcp */
ip4h->src_be = conn->local_ip4_be;
ip4h->dst_be = conn->peer_ip4_be;
ip4h->csum_be = 0;
if (!iip_ops_nic_feature_offload_ip4_tx_checksum(opaque)) { /* ip4 csum */
uint8_t *_b[1]; _b[0] = (uint8_t *) ip4h;
{
uint16_t _l[1]; _l[0] = (uint16_t) ((ip4h->vl & 0x0f) * 4);
ip4h->csum_be = __iip_htons(__iip_netcsum16(_b, _l, 1, 0));
}
} else
iip_ops_nic_offload_ip4_tx_checksum_mark(out_p->pkt, opaque);
}
__iip_assert(conn->rx_buf_cnt.limit < (1U << 30) /* 1GB limit : RFC 7323 */ / IIP_CONF_TCP_OPT_MSS);
{
struct iip_tcp_hdr *tcph = PB_TCP(out_p->pkt);
tcph->src_be = conn->local_port_be;
tcph->dst_be = conn->peer_port_be;
tcph->seq_be = conn->seq_be;
tcph->ack_seq_be = conn->ack_seq_be;
tcph->flags = 0;
PB_TCP_HDR_SET_LEN(out_p->pkt, __iip_round_up(sizeof(struct iip_tcp_hdr) + (syn ? 4 + 3 + (IIP_CONF_TCP_OPT_SACK_OK ? 2 : 0) : 0) + (sackbuf ? sackbuf[1] : 0) + (IIP_CONF_TCP_TIMESTAMP_ENABLE ? 12 : 0), 4) / 4);
PB_TCP_HDR_SET_FLAGS(out_p->pkt, (syn ? 0x02U : 0) | (ack ? 0x10U : 0) | (rst ? 0x04U : 0) | (fin ? 0x01U : 0) | tcp_flags);
tcph->win_be = __iip_compute_tcp_win_be(conn->rx_buf_cnt.limit - conn->rx_buf_cnt.used, IIP_CONF_TCP_OPT_MSS, IIP_CONF_TCP_OPT_WS);
tcph->urg_p_be = 0;
tcph->csum_be = 0;
{
uint8_t *optbuf = PB_TCP_OPT(out_p->pkt), optlen = 0;
{
if (syn) { /* mss */
optbuf[optlen + 0] = 2;
optbuf[optlen + 1] = 4;
*((uint16_t *) &(optbuf[optlen + 2])) = __iip_htons(IIP_CONF_TCP_OPT_MSS);
optlen += optbuf[optlen + 1];
}
if (syn) { /* window scale */
optbuf[optlen + 0] = 3;
optbuf[optlen + 1] = 3;
__iip_assert(IIP_CONF_TCP_OPT_WS < 15); /* RFC 7323 */
optbuf[optlen + 2] = IIP_CONF_TCP_OPT_WS;
optlen += optbuf[optlen + 1];
}
if (syn && IIP_CONF_TCP_OPT_SACK_OK) { /* sack ok */
optbuf[optlen + 0] = 4;
optbuf[optlen + 1] = 2;
optlen += optbuf[optlen + 1];
}
if (sackbuf) { /* sack */
__iip_memcpy(&optbuf[optlen], sackbuf, sackbuf[1]);
optlen += sackbuf[1];
}
if (IIP_CONF_TCP_TIMESTAMP_ENABLE) { /* time stamp */
optbuf[optlen + 0] = 1; /* nop */
optbuf[optlen + 1] = 1; /* nop */
optbuf[optlen + 2] = 8;
optbuf[optlen + 3] = 10;
((uint32_t *) &optbuf[optlen + 4])[0] = __iip_htonl(s->tcp.pkt_ts);
((uint32_t *) &optbuf[optlen + 4])[1] = __iip_htonl(conn->ts);
optlen += optbuf[optlen + 3] + 2;
}
__iip_assert(PB_TCP_HDR_LEN(out_p->pkt) == __iip_round_up(sizeof(struct iip_tcp_hdr) + optlen, 4) / 4); /* we already have configured */
}
__iip_memset(&optbuf[optlen], 0, PB_TCP_HDR_LEN(out_p->pkt) * 4 - optlen);
}
if (!iip_ops_nic_feature_offload_tcp_tx_checksum(opaque)) {
struct iip_l4_ip4_pseudo_hdr _pseudo;
_pseudo.ip4_src_be = conn->local_ip4_be;
_pseudo.ip4_dst_be = conn->peer_ip4_be;
_pseudo.pad = 0;
_pseudo.proto = 6;
_pseudo.len_be = __iip_htons(PB_TCP_HDR_LEN(out_p->pkt) * 4 + payload_len);
{
uint8_t *_b[3]; _b[0] = (uint8_t *) &_pseudo; _b[1] = (uint8_t *) tcph; _b[2] = (pkt ? (uint8_t *) iip_ops_pkt_get_data(pkt, opaque) : NULL);
{
uint16_t _l[3]; _l[0] = sizeof(_pseudo); _l[1] = (uint16_t) (PB_TCP_HDR_LEN(out_p->pkt) * 4); _l[2] = payload_len;
tcph->csum_be = __iip_htons(__iip_netcsum16(_b, _l, 3, 0));
}
}
} else
iip_ops_nic_offload_tcp_tx_checksum_mark(out_p->pkt, opaque); /* relies on the value of tcp hdr len on packet buf */
}
if (iip_ops_nic_feature_offload_tx_scatter_gather(opaque)) {
if (pkt) iip_ops_pkt_scatter_gather_chain_append(out_p->pkt, pkt, opaque);
iip_ops_pkt_set_len(out_p->pkt, iip_ops_l2_hdr_len(out_p->pkt, opaque) + (PB_IP4(out_p->pkt)->vl & 0x0f) * 4 + PB_TCP_HDR_LEN(out_p->pkt) * 4, opaque);
} else {
if (pkt) __iip_memcpy(PB_TCP_PAYLOAD(out_p->pkt), iip_ops_pkt_get_data(pkt, opaque), payload_len);
iip_ops_pkt_set_len(out_p->pkt, iip_ops_l2_hdr_len(out_p->pkt, opaque) + (PB_IP4(out_p->pkt)->vl & 0x0f) * 4 + PB_TCP_HDR_LEN(out_p->pkt) * 4 + payload_len, opaque);
if (pkt) out_p->orig_pkt = pkt;
}
conn->seq_be = __iip_htonl(__iip_ntohl(conn->seq_be) + payload_len + syn + fin);
if (ack)
conn->ack_seq_sent = __iip_ntohl(PB_TCP(out_p->pkt)->ack_seq_be);
if (iip_ops_nic_feature_offload_tcp_tx_tso(opaque))
iip_ops_nic_offload_tcp_tx_tso_mark(out_p->pkt, opaque);
__iip_enqueue_obj(conn->head[1], out_p, 0);
pushed_payload_len += payload_len;
if (pushed_payload_len != total_payload_len)
goto again;
else {
out_p->ack_cb_pkt = _pkt;
if (1 < frag_cnt)
out_p->flags |= __IIP_PB_FLAGS_NEED_ACK_CB_PKT_FREE;
}
return 0;
}
static uint16_t iip_tcp_send(void *_mem, void *_handle, void *pkt, uint16_t tcp_flags, void *opaque)
{
struct iip_tcp_conn *conn = (struct iip_tcp_conn *) _handle;
if (conn->state != __IIP_TCP_STATE_ESTABLISHED)
return 0;
return __iip_tcp_push((struct workspace *) _mem, conn, pkt, 0, 1, 0, 0, tcp_flags, NULL, opaque);
}
static uint16_t iip_tcp_close(void *_mem, void *_handle, void *opaque)
{
struct iip_tcp_conn *conn = (struct iip_tcp_conn *) _handle;
if (conn->state == __IIP_TCP_STATE_ESTABLISHED) {
conn->state = __IIP_TCP_STATE_FIN_WAIT1;
IIP_OPS_DEBUG_PRINTF("%p: TCP_STATE_FIN_WAIT1\n", (void *) conn);
{
uint16_t ret = __iip_tcp_push((struct workspace *) _mem, conn, NULL, 0, 1, 1, 0, 0, NULL, opaque);
conn->fin_ack_seq_be = conn->seq_be;
return ret;
}
} else
return 0;
}
static void iip_tcp_rxbuf_consumed(void *_mem, void *_handle, uint16_t cnt, void *opaque)
{
struct iip_tcp_conn *conn = (struct iip_tcp_conn *) _handle;
__iip_assert(cnt <= conn->rx_buf_cnt.used);
conn->rx_buf_cnt.used -= cnt;
{ /* unused */
(void) _mem;
(void) opaque;
}
}
static void __iip_tcp_conn_init(struct workspace *s, struct iip_tcp_conn *conn,
uint8_t local_mac[], uint32_t local_ip4_be, uint16_t local_port_be,
uint8_t peer_mac[], uint32_t peer_ip4_be, uint16_t peer_port_be,
uint8_t state, void *opaque)
{
__iip_memset(conn, 0, sizeof(*conn));
__iip_memcpy(conn->local_mac, local_mac, sizeof(conn->local_mac));
conn->local_ip4_be = local_ip4_be;
conn->local_port_be = local_port_be;
__iip_memcpy(conn->peer_mac, peer_mac, sizeof(conn->peer_mac));
conn->peer_ip4_be = peer_ip4_be;
conn->peer_port_be = peer_port_be;
conn->seq_be = __iip_htonl(s->tcp.iss);
conn->ack_seq_be = 0;
conn->acked_seq = 0xffff; /* to differentiate from ack number for Dup ACK detection */
conn->state = state;
conn->rx_buf_cnt.limit = IIP_CONF_TCP_RX_BUF_CNT;
conn->cc.win = IIP_CONF_TCP_WIN_INIT;
conn->cc.ssthresh = IIP_CONF_TCP_SSTHRESH_INIT;
conn->rtt.srtt = 0;
conn->rtt.rttvar = 24;
__iip_assert(conn->rx_buf_cnt.limit * IIP_CONF_TCP_OPT_MSS < (1U << 30));
conn->win_be = __iip_compute_tcp_win_be(conn->rx_buf_cnt.limit, IIP_CONF_TCP_OPT_MSS, IIP_CONF_TCP_OPT_WS);
__iip_enqueue_obj(s->tcp.conns, conn, 0);
__iip_enqueue_obj(s->tcp.conns_ht[(conn->peer_ip4_be + conn->local_port_be + conn->peer_port_be) % IIP_CONF_TCP_CONN_HT_SIZE], conn, 1);
__iip_assert(conn->rx_buf_cnt.used < conn->rx_buf_cnt.limit);
{ /* unused */
(void) opaque;
}
}
static uint16_t iip_tcp_connect(void *_mem,
uint8_t local_mac[], uint32_t local_ip4_be, uint16_t local_port_be,
uint8_t peer_mac[], uint32_t peer_ip4_be, uint16_t peer_port_be,
void *opaque)
{
struct workspace *s = (struct workspace *) _mem;
struct iip_tcp_conn *conn = s->pool.conn[0];
__iip_assert(conn);
__iip_dequeue_obj(s->pool.conn, conn, 0);
__iip_tcp_conn_init(s, conn, local_mac, local_ip4_be, local_port_be, peer_mac, peer_ip4_be, peer_port_be, __IIP_TCP_STATE_SYN_SENT, opaque);
return __iip_tcp_push(s, conn, NULL, 1, 0, 0, 0, 0, NULL, opaque);
}
static uint16_t iip_udp_send(void *_mem,
uint8_t local_mac[], uint32_t local_ip4_be, uint16_t local_port_be,
uint8_t peer_mac[], uint32_t peer_ip4_be, uint16_t peer_port_be,
void *pkt, void *opaque)
{
void *out_pkt = iip_ops_pkt_alloc(opaque);
uint16_t payload_len = (pkt ? iip_ops_pkt_get_len(pkt, opaque) : 0);
__iip_assert(out_pkt);
iip_ops_l2_hdr_craft(out_pkt, local_mac, peer_mac, __iip_htons(0x0800), opaque);
{
struct iip_ip4_hdr *ip4h = PB_IP4(out_pkt);
ip4h->vl = (4 /* ver ipv4 */ << 4) | (sizeof(struct iip_ip4_hdr) / 4 /* len in octet */);
ip4h->len_be = __iip_htons((ip4h->vl & 0x0f) * 4 + sizeof(struct iip_udp_hdr) + payload_len);
ip4h->tos = 0;
ip4h->id_be = 0; /* no ip4 fragment */
ip4h->off_be = 0; /* no ip4 fragment */
ip4h->ttl = IIP_CONF_IP4_TTL;
ip4h->proto = 17; /* udp */
ip4h->src_be = local_ip4_be;
ip4h->dst_be = peer_ip4_be;
ip4h->csum_be = 0;
if (!iip_ops_nic_feature_offload_ip4_tx_checksum(opaque)) { /* ip4 csum */
uint8_t *_b[1]; _b[0] = (uint8_t *) ip4h;
{
uint16_t _l[1]; _l[0] = (uint16_t) ((ip4h->vl & 0x0f) * 4);
ip4h->csum_be = __iip_htons(__iip_netcsum16(_b, _l, 1, 0));
}
} else
iip_ops_nic_offload_ip4_tx_checksum_mark(out_pkt, opaque);
{
struct iip_udp_hdr *udph = PB_UDP(out_pkt);
udph->src_be = local_port_be;
udph->dst_be = peer_port_be;
udph->len_be = __iip_htons(sizeof(struct iip_udp_hdr) + payload_len);
udph->csum_be = 0;
if (!iip_ops_nic_feature_offload_udp_tx_checksum(opaque)) { /* udp csum */
struct iip_l4_ip4_pseudo_hdr _pseudo;
_pseudo.ip4_src_be = local_ip4_be;
_pseudo.ip4_dst_be = peer_ip4_be;
_pseudo.pad = 0;
_pseudo.proto = 17;
_pseudo.len_be = __iip_htons(sizeof(struct iip_udp_hdr) + payload_len);
{
uint8_t *_b[3]; _b[0] = (uint8_t *) &_pseudo; _b[1] = (uint8_t *) udph; _b[2] = (pkt ? (uint8_t *) iip_ops_pkt_get_data(pkt, opaque) : NULL);
{
uint16_t _l[3]; _l[0] = sizeof(_pseudo); _l[1] = sizeof(struct iip_udp_hdr); _l[2] = payload_len;
udph->csum_be = __iip_htons(__iip_netcsum16(_b, _l, 3, 0));
}
}
} else
iip_ops_nic_offload_udp_tx_checksum_mark(out_pkt, opaque);
if (iip_ops_nic_feature_offload_tx_scatter_gather(opaque)) {
if (pkt) iip_ops_pkt_scatter_gather_chain_append(out_pkt, pkt, opaque);
iip_ops_pkt_set_len(out_pkt, iip_ops_l2_hdr_len(out_pkt, opaque) + (ip4h->vl & 0x0f) * 4 + sizeof(struct iip_udp_hdr), opaque);
} else {
if (pkt) __iip_memcpy(&((uint8_t *) iip_ops_pkt_get_data(out_pkt, opaque))[iip_ops_l2_hdr_len(out_pkt, opaque) + (ip4h->vl & 0x0f) * 4 + sizeof(struct iip_udp_hdr)], iip_ops_pkt_get_data(pkt, opaque), payload_len);
iip_ops_pkt_set_len(out_pkt, iip_ops_l2_hdr_len(out_pkt, opaque) + (ip4h->vl & 0x0f) * 4 + __iip_ntohs(udph->len_be), opaque);
if (pkt) iip_ops_pkt_free(pkt, opaque);
}
}
}
if (iip_ops_nic_feature_offload_udp_tx_tso(opaque))
iip_ops_nic_offload_udp_tx_tso_mark(out_pkt, opaque);
iip_ops_l2_push(out_pkt, opaque);
return 0;
{ /* unused */
(void) _mem;
}
}
static uint16_t iip_run(void *_mem, uint8_t mac[], uint32_t ip4_be, void *pkt[], uint16_t cnt, uint32_t *next_us, void *opaque)
{
struct workspace *s = (struct workspace *) _mem;
uint16_t ret = 0;
uint32_t _next_us = 1000000UL; /* 1 sec */
uint32_t now_ms;
{
uint32_t t[3];
iip_ops_util_now_ns(t, opaque);
now_ms = (t[1] * 1000UL + t[2] / 1000000UL);
}
{ /* periodic timer */
if (200 <= now_ms - s->timer.prev_fast){ /* fast timer every 200 ms */
/* send delayed ack */
{
struct iip_tcp_conn *conn, *_conn_n;
__iip_q_for_each_safe(s->tcp.conns, conn, _conn_n, 0) {
if (conn->state == __IIP_TCP_STATE_ESTABLISHED && !conn->head[3][0]) {
if ((__iip_ntohl(conn->ack_seq_be) != conn->ack_seq_sent)) /* we got payload, but ack is not pushed by the app */
__iip_tcp_push(s, conn, NULL, 0, 1, 0, 0, 0, NULL, opaque);
}
}
}
{ /* incrment tcp packet timestamp counter */
s->tcp.pkt_ts++;
}
s->timer.prev_fast = now_ms;
}
if (500 <= now_ms - s->timer.prev_slow){ /* slow timer every 500 ms */
{ /* incrment initial send sequence number */
s->tcp.iss++; /* while RFC 793 specifies to increment every 4 us */
}
s->timer.prev_slow = now_ms;
}
if (1000 <= now_ms - s->timer.prev_very_slow) { /* slow timer every 1000 ms */
{ /* close connections */
struct iip_tcp_conn *conn, *_conn_n;
__iip_q_for_each_safe(s->tcp.conns, conn, _conn_n, 0) {
switch (conn->state) {
case __IIP_TCP_STATE_TIME_WAIT:
if (IIP_CONF_TCP_MSL_SEC * 1000U * 2 < now_ms - conn->time_wait_ts_ms) {
conn->state = __IIP_TCP_STATE_CLOSED;
__iip_dequeue_obj(s->tcp.conns_ht[(conn->peer_ip4_be + conn->local_port_be + conn->peer_port_be) % IIP_CONF_TCP_CONN_HT_SIZE], conn, 1);
__iip_dequeue_obj(s->tcp.conns, conn, 0);
__iip_enqueue_obj(s->tcp.closed_conns, conn, 0);
IIP_OPS_DEBUG_PRINTF("%p: TCP_STATE_TIME_WAIT - TCP_STATE_CLOSED (%u %u (%u %u))\n", (void *) conn, IIP_CONF_TCP_MSL_SEC * 1000U * 2, (now_ms - conn->time_wait_ts_ms) * 1000U, now_ms, conn->time_wait_ts_ms);
}
break;
default:
break;
}
}
}
s->timer.prev_very_slow = now_ms;
}
{
_next_us = (s->timer.prev_fast + 200U - now_ms < _next_us * 1000U ? (s->timer.prev_fast + 200U - now_ms) * 1000U : _next_us);
_next_us = (s->timer.prev_slow + 500U - now_ms < _next_us * 1000U ? (s->timer.prev_slow + 500U - now_ms) * 1000U : _next_us);
_next_us = (s->timer.prev_very_slow + 1000U - now_ms < _next_us * 1000U ? (s->timer.prev_very_slow + 1000U - now_ms) * 1000U : _next_us);
}
}
{ /* steer packet to an ip4_rx queue or discard after executing callback */
struct pb *ip4_rx[2] = { 0 };
{
uint16_t i;
for (i = 0; i < cnt; i++) {
if (iip_ops_l2_skip(pkt[i], opaque))
iip_ops_pkt_free(pkt[i], opaque);
else {
uint8_t pkt_used = 0;
struct pb *p = __iip_alloc_pb(s, pkt[i], opaque);