driverif.c 文件参考

浏览源代码.

函数
LWIP_STATIC void	driverif_init_ifname (struct netif *netif)
LWIP_STATIC err_t	driverif_output (struct netif *netif, struct pbuf *p)
void	driverif_input (struct netif *netif, struct pbuf *p)

函数说明

driverif_init_ifname()

LWIP_STATIC void driverif_init_ifname

(

struct netif *

netif

)

在文件 driverif.c 第 52 行定义.

{
    struct netif *tmpnetif = NULL;
    const char *prefix = (netif->link_layer_type == WIFI_DRIVER_IF) ? "wlan" : "eth";
 
    netif->name[0] = prefix[0];
    netif->name[1] = prefix[1];
 
    for (int i = 0; i < LWIP_NETIF_IFINDEX_MAX_EX; ++i) {
        if (snprintf_s(netif->full_name, sizeof(netif->full_name), sizeof(netif->full_name) - 1,
                       "%s%d", prefix, i) < 0) {
            break;
        }
        NETIF_FOREACH(tmpnetif) {
            if (strcmp(tmpnetif->full_name, netif->full_name) == 0) {
                break;
            }
        }
        if (tmpnetif == NULL) {
            return;
        }
    }
    netif->full_name[0] = '\0';
}

driverif_input()

void driverif_input	(	struct netif *	netif,
		struct pbuf *	p
	)

在文件 driverif.c 第 134 行定义.

{
#if PF_PKT_SUPPORT
#if  (DRIVERIF_DEBUG & LWIP_DBG_OFF)
    u16_t ethhdr_type;
    struct eth_hdr* ethhdr = NULL;
#endif
#else
    u16_t ethhdr_type;
    struct eth_hdr *ethhdr = NULL;
#endif
    err_t ret = ERR_VAL;
 
    LWIP_ERROR("driverif_input : invalid arguments", ((netif != NULL) && (p != NULL)), return);
 
    LWIP_DEBUGF(DRIVERIF_DEBUG, ("driverif_input : going to receive input packet. netif 0x%p, pbuf 0x%p, \
                               packet_length %"U16_F"\n", (void *)netif, (void *)p, p->tot_len));
 
    /* points to packet payload, which starts with an Ethernet header */
    MIB2_STATS_NETIF_ADD(netif, ifinoctets, p->tot_len);
    if (p->len < SIZEOF_ETH_HDR) {
        (void)pbuf_free(p);
        LINK_STATS_INC(link.drop);
        LINK_STATS_INC(link.link_rx_drop);
        return;
    }
 
#if PF_PKT_SUPPORT
#if  (DRIVERIF_DEBUG & LWIP_DBG_OFF)
    ethhdr = (struct eth_hdr *)p->payload;
    ethhdr_type = ntohs(ethhdr->type);
    LWIP_DEBUGF(DRIVERIF_DEBUG, ("driverif_input : received packet of type %"U16_F" netif->input=%p\n", ethhdr_type, netif->input));
#endif
 
    /* full packet send to tcpip_thread to process */
    if (netif->input) {
        ret = netif->input(p, netif);
    }
    if (ret != ERR_OK) {
        LWIP_DEBUGF(DRIVERIF_DEBUG, ("driverif_input: IP input error\n"));
        (void)pbuf_free(p);
        LINK_STATS_INC(link.drop);
        LINK_STATS_INC(link.link_rx_drop);
        if (ret == ERR_MEM) {
            LINK_STATS_INC(link.link_rx_overrun);
        }
    } else {
        LINK_STATS_INC(link.recv);
    }
 
#else
    ethhdr = (struct eth_hdr *)p->payload;
    ethhdr_type = ntohs(ethhdr->type);
 
    switch (ethhdr_type) {
        /* IP or ARP packet? */
        case ETHTYPE_IP:
        case ETHTYPE_IPV6:
        case ETHTYPE_ARP:
#if ETHARP_SUPPORT_VLAN
        case ETHTYPE_VLAN:
#endif /* ETHARP_SUPPORT_VLAN */
            LWIP_DEBUGF(DRIVERIF_DEBUG, ("driverif_input : received packet of type %"U16_F"\n", ethhdr_type));
            /* full packet send to tcpip_thread to process */
            if (netif->input != NULL) {
                ret = netif->input(p, netif);
            }
 
            if (ret != ERR_OK) {
                LWIP_DEBUGF(DRIVERIF_DEBUG, ("driverif_input: IP input error\n"));
                (void)pbuf_free(p);
                LINK_STATS_INC(link.drop);
                LINK_STATS_INC(link.link_rx_drop);
                if (ret == ERR_MEM) {
                    MIB2_STATS_NETIF_INC(netif, ifinoverruns);
                    LINK_STATS_INC(link.link_rx_overrun);
                }
            } else {
                LINK_STATS_INC(link.recv);
            }
            break;
 
        default:
            LWIP_DEBUGF(DRIVERIF_DEBUG, ("driverif_input : received packet is of unsupported type %"U16_F"\n", ethhdr_type));
            (void)pbuf_free(p);
            LINK_STATS_INC(link.drop);
            LINK_STATS_INC(link.link_rx_drop);
            break;
    }
#endif
 
    LWIP_DEBUGF(DRIVERIF_DEBUG, ("driverif_input : received packet is processed\n"));
}

driverif_output()

LWIP_STATIC err_t driverif_output	(	struct netif *	netif,
		struct pbuf *	p
	)

在文件 driverif.c 第 94 行定义.

{
    LWIP_DEBUGF(DRIVERIF_DEBUG, ("driverif_output : going to send packet pbuf 0x%p of length %"U16_F" through netif 0x%p\n", \
    (void *)p, p->tot_len, (void *)netif));
 
#if PF_PKT_SUPPORT
    if (all_pkt_raw_pcbs != NULL) {
    p->flags = (u16_t)(p->flags & ~(PBUF_FLAG_LLMCAST | PBUF_FLAG_LLBCAST | PBUF_FLAG_HOST));
    p->flags |= PBUF_FLAG_OUTGOING;
    (void)raw_pkt_input(p, netif, NULL);
  }
#endif
 
#if ETH_PAD_SIZE
    (void)pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
#endif
 
    netif->drv_send(netif, p);
 
#if ETH_PAD_SIZE
    (void)pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
#endif
    MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p->tot_len);
    LINK_STATS_INC(link.xmit);
 
    return ERR_OK;
}