net: Implement a new network stack
The old network stack has some bad limitations: - network commands are required to call NetLoop() which only returns when the network layer wants to. Instead we now use a net_poll() function which returns after handling one packet (or immediately if no packet is available). - There can be only one packet handler which makes it impossible to handle multiple connections - CamelCaseMakesItHardToRead The new network stack is implemented as a parallel universe. Currently all commands still use the old stack. They are converted in subsequent patches. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer
parent
994f95c073
commit
97070487fa
341
include/net.h
341
include/net.h
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@ -15,6 +15,7 @@
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#include <driver.h>
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#include <linux/types.h>
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#include <param.h>
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#include <malloc.h>
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#include <asm/byteorder.h> /* for nton* / ntoh* stuff */
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@ -186,8 +187,6 @@ typedef struct
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uchar ar_data[0];
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} ARP_t;
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#define ARP_HDR_SIZE (8+20) /* Size assuming ethernet */
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/*
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* ICMP stuff (just enough to handle (host) redirect messages)
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*/
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@ -199,7 +198,7 @@ typedef struct
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#define ICMP_REDIR_NET 0 /* Redirect Net */
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#define ICMP_REDIR_HOST 1 /* Redirect Host */
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typedef struct icmphdr {
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typedef struct {
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uchar type;
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uchar code;
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ushort checksum;
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@ -415,4 +414,340 @@ void eth_set_current(struct eth_device *eth);
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struct eth_device *eth_get_current(void);
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struct eth_device *eth_get_byname(char *name);
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/*
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* Ethernet header
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*/
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struct ethernet {
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uint8_t et_dest[6]; /* Destination node */
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uint8_t et_src[6]; /* Source node */
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uint16_t et_protlen; /* Protocol or length */
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} __attribute__ ((packed));
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#define ETHER_HDR_SIZE 14 /* Ethernet header size */
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#define PROT_IP 0x0800 /* IP protocol */
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#define PROT_ARP 0x0806 /* IP ARP protocol */
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#define PROT_RARP 0x8035 /* IP ARP protocol */
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#define PROT_VLAN 0x8100 /* IEEE 802.1q protocol */
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#define IPPROTO_ICMP 1 /* Internet Control Message Protocol */
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#define IPPROTO_UDP 17 /* User Datagram Protocol */
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/*
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* Internet Protocol (IP) header.
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*/
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struct iphdr {
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uint8_t hl_v;
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uint8_t tos;
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uint16_t tot_len;
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uint16_t id;
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uint16_t frag_off;
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uint8_t ttl;
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uint8_t protocol;
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uint16_t check;
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uint32_t saddr;
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uint32_t daddr;
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/* The options start here. */
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} __attribute__ ((packed));
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struct udphdr {
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uint16_t uh_sport; /* source port */
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uint16_t uh_dport; /* destination port */
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uint16_t uh_ulen; /* udp length */
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uint16_t uh_sum; /* udp checksum */
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} __attribute__ ((packed));
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/*
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* Address Resolution Protocol (ARP) header.
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*/
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struct arprequest
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{
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uint16_t ar_hrd; /* Format of hardware address */
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#define ARP_ETHER 1 /* Ethernet hardware address */
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uint16_t ar_pro; /* Format of protocol address */
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uint8_t ar_hln; /* Length of hardware address */
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uint8_t ar_pln; /* Length of protocol address */
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uint16_t ar_op; /* Operation */
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#define ARPOP_REQUEST 1 /* Request to resolve address */
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#define ARPOP_REPLY 2 /* Response to previous request */
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#define RARPOP_REQUEST 3 /* Request to resolve address */
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#define RARPOP_REPLY 4 /* Response to previous request */
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/*
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* The remaining fields are variable in size, according to
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* the sizes above, and are defined as appropriate for
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* specific hardware/protocol combinations.
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*/
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uint8_t ar_data[0];
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} __attribute__ ((packed));
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#define ARP_HDR_SIZE (8 + 20) /* Size assuming ethernet */
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/*
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* ICMP stuff (just enough to handle (host) redirect messages)
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*/
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#define ICMP_ECHO_REPLY 0 /* Echo reply */
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#define ICMP_REDIRECT 5 /* Redirect (change route) */
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#define ICMP_ECHO_REQUEST 8 /* Echo request */
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/* Codes for REDIRECT. */
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#define ICMP_REDIR_NET 0 /* Redirect Net */
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#define ICMP_REDIR_HOST 1 /* Redirect Host */
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struct icmphdr {
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uint8_t type;
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uint8_t code;
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uint16_t checksum;
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union {
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struct {
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uint16_t id;
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uint16_t sequence;
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} echo;
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uint32_t gateway;
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struct {
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uint16_t __unused;
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uint16_t mtu;
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} frag;
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} un;
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} __attribute__ ((packed));
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/*
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* Maximum packet size; used to allocate packet storage.
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* TFTP packets can be 524 bytes + IP header + ethernet header.
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* Lets be conservative, and go for 38 * 16. (Must also be
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* a multiple of 32 bytes).
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*/
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#define PKTSIZE 1518
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/**********************************************************************/
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/*
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* Globals.
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*
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* Note:
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*
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* All variables of type IPaddr_t are stored in NETWORK byte order
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* (big endian).
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*/
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extern unsigned char *NetRxPackets[PKTBUFSRX];/* Receive packets */
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void net_set_ip(IPaddr_t ip);
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void net_set_serverip(IPaddr_t ip);
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void net_set_netmask(IPaddr_t ip);
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void net_set_gateway(IPaddr_t ip);
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IPaddr_t net_get_ip(void);
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IPaddr_t net_get_serverip(void);
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/* Do the work */
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void net_poll(void);
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static inline struct iphdr *net_eth_to_iphdr(char *pkt)
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{
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return (struct iphdr *)(pkt + ETHER_HDR_SIZE);
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}
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static inline struct udphdr *net_eth_to_udphdr(char *pkt)
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{
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return (struct udphdr *)(net_eth_to_iphdr(pkt) + 1);
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}
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static inline struct icmphdr *net_eth_to_icmphdr(char *pkt)
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{
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return (struct icmphdr *)(net_eth_to_iphdr(pkt) + 1);
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}
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static inline char *net_eth_to_icmp_payload(char *pkt)
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{
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return (char *)(net_eth_to_icmphdr(pkt) + 1);
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}
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static inline char *net_eth_to_udp_payload(char *pkt)
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{
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return (char *)(net_eth_to_udphdr(pkt) + 1);
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}
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static inline int net_eth_to_udplen(char *pkt)
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{
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struct udphdr *udp = net_eth_to_udphdr(pkt);
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return ntohs(udp->uh_ulen) - 8;
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}
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int net_checksum_ok(unsigned char *, int); /* Return true if cksum OK */
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uint16_t net_checksum(unsigned char *, int); /* Calculate the checksum */
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void NetReceive(unsigned char *, int);
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/* Print an IP address on the console */
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void print_IPaddr (IPaddr_t);
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/*
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* The following functions are a bit ugly, but necessary to deal with
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* alignment restrictions on ARM.
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*
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* We're using inline functions, which had the smallest memory
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* footprint in our tests.
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*/
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/* return IP *in network byteorder* */
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static inline IPaddr_t net_read_ip(void *from)
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{
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IPaddr_t ip;
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memcpy((void*)&ip, from, sizeof(ip));
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return ip;
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}
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/* return uint32 *in network byteorder* */
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static inline uint32_t net_read_uint32(uint32_t *from)
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{
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ulong l;
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memcpy((void*)&l, (void*)from, sizeof(l));
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return l;
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}
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/* write IP *in network byteorder* */
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static inline void net_write_ip(void *to, IPaddr_t ip)
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{
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memcpy(to, (void*)&ip, sizeof(ip));
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}
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/* copy IP */
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static inline void net_copy_ip(void *to, void *from)
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{
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memcpy(to, from, sizeof(IPaddr_t));
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}
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/* copy ulong */
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static inline void net_copy_uint32(uint32_t *to, uint32_t *from)
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{
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memcpy(to, from, sizeof(uint32_t));
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}
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/* Convert an IP address to a string */
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char *ip_to_string (IPaddr_t x, char *s);
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/* Convert a string to ip address */
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int string_to_ip(const char *s, IPaddr_t *ip);
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IPaddr_t getenv_ip(const char *name);
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int setenv_ip(const char *name, IPaddr_t ip);
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int string_to_ethaddr(const char *str, char *enetaddr);
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void ethaddr_to_string(const unsigned char *enetaddr, char *str);
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/**
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* is_zero_ether_addr - Determine if give Ethernet address is all zeros.
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Return true if the address is all zeroes.
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*/
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static inline int is_zero_ether_addr(const u8 *addr)
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{
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return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
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}
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/**
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* is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Return true if the address is a multicast address.
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* By definition the broadcast address is also a multicast address.
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*/
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static inline int is_multicast_ether_addr(const u8 *addr)
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{
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return (0x01 & addr[0]);
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}
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/**
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* is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802).
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Return true if the address is a local address.
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*/
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static inline int is_local_ether_addr(const u8 *addr)
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{
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return (0x02 & addr[0]);
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}
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/**
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* is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Return true if the address is the broadcast address.
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*/
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static inline int is_broadcast_ether_addr(const u8 *addr)
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{
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return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff;
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}
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/**
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* is_valid_ether_addr - Determine if the given Ethernet address is valid
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* @addr: Pointer to a six-byte array containing the Ethernet address
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*
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* Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
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* a multicast address, and is not FF:FF:FF:FF:FF:FF.
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*
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* Return true if the address is valid.
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*/
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static inline int is_valid_ether_addr(const u8 *addr)
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{
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/* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
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* explicitly check for it here. */
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return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
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}
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typedef void rx_handler_f(char *packet, unsigned int len);
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void eth_set_current(struct eth_device *eth);
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struct eth_device *eth_get_current(void);
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struct eth_device *eth_get_byname(char *name);
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void net_update_env(void);
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/**
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* net_receive - Pass a received packet from an ethernet driver to the protocol stack
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* @pkt: Pointer to the packet
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* @len: length of the packet
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*
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* Return 0 if the packet is successfully handled. Can be ignored
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*/
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int net_receive(unsigned char *pkt, int len);
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struct net_connection {
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struct ethernet *et;
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struct iphdr *ip;
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struct udphdr *udp;
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struct icmphdr *icmp;
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unsigned char *packet;
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struct list_head list;
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rx_handler_f *handler;
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int proto;
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};
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static inline char *net_alloc_packet(void)
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{
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return memalign(32, PKTSIZE);
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}
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struct net_connection *net_udp_new(IPaddr_t dest, uint16_t dport,
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rx_handler_f *handler);
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struct net_connection *net_icmp_new(IPaddr_t dest, rx_handler_f *handler);
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void net_unregister(struct net_connection *con);
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static inline int net_udp_bind(struct net_connection *con, int sport)
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{
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con->udp->uh_sport = ntohs(sport);
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return 0;
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}
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static inline unsigned char *net_udp_get_payload(struct net_connection *con)
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{
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return con->packet + sizeof(struct ethernet) + sizeof(struct iphdr) +
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sizeof(struct udphdr);
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}
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int net_udp_send(struct net_connection *con, int len);
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int net_icmp_send(struct net_connection *con, int len);
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#endif /* __NET_H__ */
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540
net/net.c
540
net/net.c
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@ -77,7 +77,9 @@
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#include <net.h>
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#include <driver.h>
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#include <errno.h>
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#include <init.h>
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#include <linux/ctype.h>
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#include <linux/err.h>
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#include "tftp.h"
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#include "rarp.h"
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#include "nfs.h"
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@ -89,7 +91,6 @@
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# define ARP_TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
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#endif
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/** BOOTP EXTENTIONS **/
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IPaddr_t NetOurSubnetMask=0; /* Our subnet mask (0=unknown) */
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@ -407,6 +408,9 @@ NetReceive(uchar * inpkt, int len)
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pr_debug("packet received\n");
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if (!net_receive(inpkt, len))
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return;
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NetRxPkt = inpkt;
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NetRxPktLen = len;
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et = (Ethernet_t *)inpkt;
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@ -582,7 +586,8 @@ NetReceive(uchar * inpkt, int len)
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NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
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memcpy (NetServerEther, &arp->ar_data[ 0], 6);
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(*packetHandler)(0,0,0,0);
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if (packetHandler)
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(*packetHandler)(0,0,0,0);
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}
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break;
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@ -649,7 +654,8 @@ NetReceive(uchar * inpkt, int len)
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* IP header OK. Pass the packet to the current handler.
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*/
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/* XXX point to ip packet */
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(*packetHandler)((uchar *)ip, 0, 0, 0);
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if (packetHandler)
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(*packetHandler)((uchar *)ip, 0, 0, 0);
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return;
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#endif
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default:
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@ -701,7 +707,8 @@ NetReceive(uchar * inpkt, int len)
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/*
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* IP header OK. Pass the packet to the current handler.
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*/
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(*packetHandler)((uchar *)ip +IP_HDR_SIZE,
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if (packetHandler)
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(*packetHandler)((uchar *)ip +IP_HDR_SIZE,
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ntohs(ip->udp_dst),
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ntohs(ip->udp_src),
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ntohs(ip->udp_len) - 8);
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@ -882,6 +889,30 @@ int string_to_ip(const char *s, IPaddr_t *ip)
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return 0;
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}
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IPaddr_t getenv_ip(const char *name)
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{
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IPaddr_t ip;
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const char *var = getenv(name);
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if (!var)
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return 0;
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string_to_ip(var, &ip);
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return ip;
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}
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int setenv_ip(const char *name, IPaddr_t ip)
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{
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char str[sizeof("xxx.xxx.xxx.xxx")];
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ip_to_string(ip, str);
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setenv(name, str);
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return 0;
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}
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void VLAN_to_string(ushort x, char *s)
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{
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x = ntohs(x);
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@ -951,10 +982,28 @@ void ethaddr_to_string(const unsigned char *enetaddr, char *str)
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enetaddr[4], enetaddr[5]);
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}
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static IPaddr_t net_netmask; /* Our subnet mask (0=unknown) */
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static IPaddr_t net_gateway; /* Our gateways IP address */
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static unsigned char net_ether[6]; /* Our ethernet address */
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static IPaddr_t net_ip; /* Our IP addr (0 = unknown) */
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static IPaddr_t net_serverip; /* Our IP addr (0 = unknown) */
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unsigned char *NetRxPackets[PKTBUFSRX]; /* Receive packets */
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static unsigned int net_ip_id;
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void net_update_env(void)
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{
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struct eth_device *edev = eth_get_current();
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net_ip = dev_get_param_ip(&edev->dev, "ipaddr");
|
||||
net_serverip = dev_get_param_ip(&edev->dev, "serverip");
|
||||
net_gateway = dev_get_param_ip(&edev->dev, "gateway");
|
||||
net_netmask = dev_get_param_ip(&edev->dev, "netmask");
|
||||
|
||||
string_to_ethaddr(dev_get_param(&edev->dev, "ethaddr"),
|
||||
net_ether);
|
||||
|
||||
NetOurIP = dev_get_param_ip(&edev->dev, "ipaddr");
|
||||
NetServerIP = dev_get_param_ip(&edev->dev, "serverip");
|
||||
NetOurGatewayIP = dev_get_param_ip(&edev->dev, "gateway");
|
||||
|
|
@ -964,3 +1013,486 @@ void net_update_env(void)
|
|||
NetOurEther);
|
||||
}
|
||||
|
||||
int net_checksum_ok(unsigned char *ptr, int len)
|
||||
{
|
||||
return net_checksum(ptr, len) + 1;
|
||||
}
|
||||
|
||||
uint16_t net_checksum(unsigned char *ptr, int len)
|
||||
{
|
||||
uint32_t xsum = 0;
|
||||
uint16_t *p = (uint16_t *)ptr;
|
||||
|
||||
if (len & 1)
|
||||
ptr[len] = 0;
|
||||
|
||||
len = (len + 1) >> 1;
|
||||
|
||||
while (len-- > 0)
|
||||
xsum += *p++;
|
||||
|
||||
xsum = (xsum & 0xffff) + (xsum >> 16);
|
||||
xsum = (xsum & 0xffff) + (xsum >> 16);
|
||||
return xsum & 0xffff;
|
||||
}
|
||||
|
||||
static unsigned char *arp_ether;
|
||||
static IPaddr_t arp_wait_ip;
|
||||
|
||||
static void arp_handler(struct arprequest *arp)
|
||||
{
|
||||
IPaddr_t tmp;
|
||||
|
||||
/* are we waiting for a reply */
|
||||
if (!arp_wait_ip)
|
||||
return;
|
||||
|
||||
tmp = net_read_ip(&arp->ar_data[6]);
|
||||
|
||||
/* matched waiting packet's address */
|
||||
if (tmp == arp_wait_ip) {
|
||||
/* save address for later use */
|
||||
memcpy(arp_ether, &arp->ar_data[0], 6);
|
||||
|
||||
/* no arp request pending now */
|
||||
arp_wait_ip = 0;
|
||||
}
|
||||
}
|
||||
|
||||
int arp_request(IPaddr_t dest, unsigned char *ether)
|
||||
{
|
||||
char *pkt;
|
||||
struct arprequest *arp;
|
||||
uint64_t arp_start;
|
||||
static char *arp_packet;
|
||||
struct ethernet *et;
|
||||
|
||||
if (!arp_packet) {
|
||||
arp_packet = net_alloc_packet();
|
||||
if (!arp_packet)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
pkt = arp_packet;
|
||||
et = (struct ethernet *)arp_packet;
|
||||
|
||||
arp_wait_ip = dest;
|
||||
|
||||
pr_debug("ARP broadcast\n");
|
||||
|
||||
memset(et->et_dest, 0xff, 6);
|
||||
memcpy(et->et_src, net_ether, 6);
|
||||
et->et_protlen = htons(PROT_ARP);
|
||||
|
||||
arp = (struct arprequest *)(pkt + ETHER_HDR_SIZE);
|
||||
|
||||
arp->ar_hrd = htons(ARP_ETHER);
|
||||
arp->ar_pro = htons(PROT_IP);
|
||||
arp->ar_hln = 6;
|
||||
arp->ar_pln = 4;
|
||||
arp->ar_op = htons(ARPOP_REQUEST);
|
||||
|
||||
memcpy(arp->ar_data, net_ether, 6); /* source ET addr */
|
||||
net_write_ip(arp->ar_data + 6, net_ip); /* source IP addr */
|
||||
memset(arp->ar_data + 10, 0, 6); /* dest ET addr = 0 */
|
||||
|
||||
if ((dest & net_netmask) != (net_ip & net_netmask)) {
|
||||
if (!net_gateway)
|
||||
arp_wait_ip = dest;
|
||||
else
|
||||
arp_wait_ip = net_gateway;
|
||||
} else {
|
||||
arp_wait_ip = dest;
|
||||
}
|
||||
|
||||
net_write_ip(arp->ar_data + 16, arp_wait_ip);
|
||||
|
||||
arp_ether = ether;
|
||||
|
||||
eth_send(arp_packet, ETHER_HDR_SIZE + ARP_HDR_SIZE);
|
||||
arp_start = get_time_ns();
|
||||
|
||||
while (arp_wait_ip) {
|
||||
if (ctrlc())
|
||||
return -EINTR;
|
||||
|
||||
if (is_timeout(arp_start, 3 * SECOND)) {
|
||||
printf("T ");
|
||||
arp_start = get_time_ns();
|
||||
eth_send(arp_packet, ETHER_HDR_SIZE + ARP_HDR_SIZE);
|
||||
}
|
||||
|
||||
net_poll();
|
||||
}
|
||||
|
||||
pr_debug("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
|
||||
ether[0], ether[1],
|
||||
ether[2], ether[3],
|
||||
ether[4], ether[5]);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void net_poll(void)
|
||||
{
|
||||
eth_rx();
|
||||
}
|
||||
|
||||
static uint16_t net_udp_new_localport(void)
|
||||
{
|
||||
static uint16_t localport;
|
||||
|
||||
localport++;
|
||||
|
||||
if (localport < 1024)
|
||||
localport = 1024;
|
||||
|
||||
return localport;
|
||||
}
|
||||
|
||||
IPaddr_t net_get_serverip(void)
|
||||
{
|
||||
return net_serverip;
|
||||
}
|
||||
|
||||
void net_set_serverip(IPaddr_t ip)
|
||||
{
|
||||
struct eth_device *edev = eth_get_current();
|
||||
|
||||
net_serverip = ip;
|
||||
dev_set_param_ip(&edev->dev, "serverip", net_serverip);
|
||||
}
|
||||
|
||||
void net_set_ip(IPaddr_t ip)
|
||||
{
|
||||
struct eth_device *edev = eth_get_current();
|
||||
|
||||
net_ip = ip;
|
||||
dev_set_param_ip(&edev->dev, "ipaddr", net_ip);
|
||||
}
|
||||
|
||||
IPaddr_t net_get_ip(void)
|
||||
{
|
||||
return net_ip;
|
||||
}
|
||||
|
||||
void net_set_netmask(IPaddr_t nm)
|
||||
{
|
||||
struct eth_device *edev = eth_get_current();
|
||||
|
||||
net_netmask = nm;
|
||||
dev_set_param_ip(&edev->dev, "netmask", net_netmask);
|
||||
}
|
||||
|
||||
void net_set_gateway(IPaddr_t gw)
|
||||
{
|
||||
struct eth_device *edev = eth_get_current();
|
||||
|
||||
net_gateway = gw;
|
||||
dev_set_param_ip(&edev->dev, "gateway", net_gateway);
|
||||
}
|
||||
|
||||
static LIST_HEAD(connection_list);
|
||||
|
||||
static struct net_connection *net_new(IPaddr_t dest, rx_handler_f *handler)
|
||||
{
|
||||
struct net_connection *con;
|
||||
int ret;
|
||||
|
||||
if (!is_valid_ether_addr(net_ether))
|
||||
return ERR_PTR(-ENETDOWN);
|
||||
|
||||
/* If we don't have an ip only broadcast is allowed */
|
||||
if (!net_ip && dest != 0xffffffff)
|
||||
return ERR_PTR(-ENETDOWN);
|
||||
|
||||
con = xzalloc(sizeof(*con));
|
||||
con->packet = memalign(32, PKTSIZE);
|
||||
memset(con->packet, 0, PKTSIZE);
|
||||
|
||||
con->et = (struct ethernet *)con->packet;
|
||||
con->ip = (struct iphdr *)(con->packet + ETHER_HDR_SIZE);
|
||||
con->udp = (struct udphdr *)(con->packet + ETHER_HDR_SIZE + sizeof(struct iphdr));
|
||||
con->icmp = (struct icmphdr *)(con->packet + ETHER_HDR_SIZE + sizeof(struct iphdr));
|
||||
con->handler = handler;
|
||||
|
||||
if (dest == 0xffffffff) {
|
||||
memset(con->et->et_dest, 0xff, 6);
|
||||
} else {
|
||||
ret = arp_request(dest, con->et->et_dest);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
|
||||
con->et->et_protlen = htons(PROT_IP);
|
||||
memcpy(con->et->et_src, net_ether, 6);
|
||||
|
||||
con->ip->hl_v = 0x45;
|
||||
con->ip->tos = 0;
|
||||
con->ip->frag_off = htons(0x4000); /* No fragmentation */;
|
||||
con->ip->ttl = 255;
|
||||
net_copy_ip(&con->ip->daddr, &dest);
|
||||
net_copy_ip(&con->ip->saddr, &net_ip);
|
||||
|
||||
list_add_tail(&con->list, &connection_list);
|
||||
|
||||
return con;
|
||||
out:
|
||||
free(con->packet);
|
||||
free(con);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
struct net_connection *net_udp_new(IPaddr_t dest, uint16_t dport,
|
||||
rx_handler_f *handler)
|
||||
{
|
||||
struct net_connection *con = net_new(dest, handler);
|
||||
|
||||
if (IS_ERR(con))
|
||||
return con;
|
||||
|
||||
con->proto = IPPROTO_UDP;
|
||||
con->udp->uh_dport = htons(dport);
|
||||
con->udp->uh_sport = htons(net_udp_new_localport());
|
||||
con->ip->protocol = IPPROTO_UDP;
|
||||
|
||||
return con;
|
||||
}
|
||||
|
||||
struct net_connection *net_icmp_new(IPaddr_t dest, rx_handler_f *handler)
|
||||
{
|
||||
struct net_connection *con = net_new(dest, handler);
|
||||
|
||||
if (IS_ERR(con))
|
||||
return con;
|
||||
|
||||
con->proto = IPPROTO_ICMP;
|
||||
con->ip->protocol = IPPROTO_ICMP;
|
||||
|
||||
return con;
|
||||
}
|
||||
|
||||
void net_unregister(struct net_connection *con)
|
||||
{
|
||||
list_del(&con->list);
|
||||
free(con->packet);
|
||||
free(con);
|
||||
}
|
||||
|
||||
int net_ip_send(struct net_connection *con, int len)
|
||||
{
|
||||
con->ip->tot_len = htons(sizeof(struct iphdr) + len);
|
||||
con->ip->id = htons(net_ip_id++);;
|
||||
con->ip->check = 0;
|
||||
con->ip->check = ~net_checksum((unsigned char *)con->ip, sizeof(struct iphdr));
|
||||
|
||||
eth_send(con->packet, ETHER_HDR_SIZE + sizeof(struct iphdr) + len);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int net_udp_send(struct net_connection *con, int len)
|
||||
{
|
||||
con->udp->uh_ulen = htons(len + 8);
|
||||
con->udp->uh_sum = 0;
|
||||
|
||||
return net_ip_send(con, sizeof(struct udphdr) + len);
|
||||
}
|
||||
|
||||
int net_icmp_send(struct net_connection *con, int len)
|
||||
{
|
||||
con->icmp->checksum = ~net_checksum((unsigned char *)con->icmp,
|
||||
sizeof(struct icmphdr) + len);
|
||||
|
||||
return net_ip_send(con, sizeof(struct icmphdr) + len);
|
||||
}
|
||||
|
||||
static int net_answer_arp(unsigned char *pkt, int len)
|
||||
{
|
||||
struct arprequest *arp = (struct arprequest *)(pkt + ETHER_HDR_SIZE);
|
||||
struct ethernet *et = (struct ethernet *)pkt;
|
||||
unsigned char *packet;
|
||||
|
||||
debug("%s\n", __func__);
|
||||
|
||||
memcpy (et->et_dest, et->et_src, 6);
|
||||
memcpy (et->et_src, net_ether, 6);
|
||||
|
||||
et->et_protlen = htons(PROT_ARP);
|
||||
arp->ar_op = htons(ARPOP_REPLY);
|
||||
memcpy(&arp->ar_data[10], &arp->ar_data[0], 6);
|
||||
net_copy_ip(&arp->ar_data[16], &arp->ar_data[6]);
|
||||
memcpy(&arp->ar_data[0], net_ether, 6);
|
||||
net_copy_ip(&arp->ar_data[6], &net_ip);
|
||||
|
||||
packet = net_alloc_packet();
|
||||
if (!packet)
|
||||
return 0;
|
||||
memcpy(packet, pkt, ETHER_HDR_SIZE + ARP_HDR_SIZE);
|
||||
eth_send(packet, ETHER_HDR_SIZE + ARP_HDR_SIZE);
|
||||
free(packet);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void net_bad_packet(unsigned char *pkt, int len)
|
||||
{
|
||||
#ifdef DEBUG
|
||||
/*
|
||||
* We received a bad packet. for now just dump it.
|
||||
* We could add more sophisticated debugging here
|
||||
*/
|
||||
memory_display(pkt, 0, len, 1);
|
||||
#endif
|
||||
}
|
||||
|
||||
static int net_handle_arp(unsigned char *pkt, int len)
|
||||
{
|
||||
struct arprequest *arp;
|
||||
|
||||
debug("%s: got arp\n", __func__);
|
||||
|
||||
/*
|
||||
* We have to deal with two types of ARP packets:
|
||||
* - REQUEST packets will be answered by sending our
|
||||
* IP address - if we know it.
|
||||
* - REPLY packets are expected only after we asked
|
||||
* for the TFTP server's or the gateway's ethernet
|
||||
* address; so if we receive such a packet, we set
|
||||
* the server ethernet address
|
||||
*/
|
||||
arp = (struct arprequest *)(pkt + ETHER_HDR_SIZE);
|
||||
if (len < ARP_HDR_SIZE)
|
||||
goto bad;
|
||||
if (ntohs(arp->ar_hrd) != ARP_ETHER)
|
||||
goto bad;
|
||||
if (ntohs(arp->ar_pro) != PROT_IP)
|
||||
goto bad;
|
||||
if (arp->ar_hln != 6)
|
||||
goto bad;
|
||||
if (arp->ar_pln != 4)
|
||||
goto bad;
|
||||
if (net_ip == 0)
|
||||
return 0;
|
||||
if (net_read_ip(&arp->ar_data[16]) != net_ip)
|
||||
return 0;
|
||||
|
||||
switch (ntohs(arp->ar_op)) {
|
||||
case ARPOP_REQUEST:
|
||||
return net_answer_arp(pkt, len);
|
||||
case ARPOP_REPLY:
|
||||
arp_handler(arp);
|
||||
return 1;
|
||||
default:
|
||||
pr_debug("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
bad:
|
||||
net_bad_packet(pkt, len);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int net_handle_udp(unsigned char *pkt, int len)
|
||||
{
|
||||
struct iphdr *ip = (struct iphdr *)(pkt + ETHER_HDR_SIZE);
|
||||
struct net_connection *con;
|
||||
struct udphdr *udp;
|
||||
int port;
|
||||
|
||||
udp = (struct udphdr *)(ip + 1);
|
||||
port = ntohs(udp->uh_dport);
|
||||
list_for_each_entry(con, &connection_list, list) {
|
||||
if (con->proto == IPPROTO_UDP && port == ntohs(con->udp->uh_sport)) {
|
||||
con->handler(pkt, len);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int net_handle_icmp(unsigned char *pkt, int len)
|
||||
{
|
||||
struct net_connection *con;
|
||||
|
||||
debug("%s\n", __func__);
|
||||
|
||||
list_for_each_entry(con, &connection_list, list) {
|
||||
if (con->proto == IPPROTO_ICMP) {
|
||||
con->handler(pkt, len);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int net_handle_ip(unsigned char *pkt, int len)
|
||||
{
|
||||
struct iphdr *ip = (struct iphdr *)(pkt + ETHER_HDR_SIZE);
|
||||
IPaddr_t tmp;
|
||||
|
||||
debug("%s\n", __func__);
|
||||
|
||||
if (len < sizeof(struct ethernet) + sizeof(struct iphdr) ||
|
||||
len < ETHER_HDR_SIZE + ntohs(ip->tot_len)) {
|
||||
debug("%s: bad len\n", __func__);
|
||||
goto bad;
|
||||
}
|
||||
|
||||
if ((ip->hl_v & 0xf0) != 0x40)
|
||||
goto bad;
|
||||
|
||||
if (ip->frag_off & htons(0x1fff)) /* Can't deal w/ fragments */
|
||||
goto bad;
|
||||
if (!net_checksum_ok((unsigned char *)ip, sizeof(struct iphdr)))
|
||||
goto bad;
|
||||
|
||||
tmp = net_read_ip(&ip->daddr);
|
||||
if (net_ip && tmp != net_ip && tmp != 0xffffffff)
|
||||
return 0;
|
||||
|
||||
switch (ip->protocol) {
|
||||
case IPPROTO_ICMP:
|
||||
return net_handle_icmp(pkt, len);
|
||||
case IPPROTO_UDP:
|
||||
return net_handle_udp(pkt, len);
|
||||
}
|
||||
|
||||
return 0;
|
||||
bad:
|
||||
net_bad_packet(pkt, len);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int net_receive(unsigned char *pkt, int len)
|
||||
{
|
||||
struct ethernet *et = (struct ethernet *)pkt;
|
||||
int et_protlen = ntohs(et->et_protlen);
|
||||
|
||||
if (len < ETHER_HDR_SIZE)
|
||||
return 0;
|
||||
|
||||
switch (et_protlen) {
|
||||
case PROT_ARP:
|
||||
return net_handle_arp(pkt, len);
|
||||
case PROT_IP:
|
||||
return net_handle_ip(pkt, len);
|
||||
default:
|
||||
debug("%s: got unknown protocol type: %d\n", __func__, et_protlen);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
static int net_init(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < PKTBUFSRX; i++)
|
||||
NetRxPackets[i] = memalign(32, PKTSIZE);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
postcore_initcall(net_init);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue