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bug #26487: Added ip_output_if_opt that can add IP options to the IP header (used by igmp_ip_output_if)

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This commit is contained in:
goldsimon 2009-05-12 18:00:47 +00:00
parent c7ce2792c8
commit 078e2f60d6
4 changed files with 57 additions and 61 deletions
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6
CHANGELOG
View File

@ -47,7 +47,7 @@ HISTORY
2009-04-15 Simon Goldschmidt
* dhcp.c: patch #6763: Global DHCP XID can be redefined to something more unique
<EFBFBD>
2009-03-31 Kieran Mansley
* tcp.c, tcp_out.c, tcp_in.c, sys.h, tcp.h, opts.h: add support for
TCP timestamp options, off by default. Rework tcp_enqueue() to
@ -109,6 +109,10 @@ HISTORY
++ Bugfixes:
2009-05-12 Simon Goldschmidt
* ip.h, ip.c, igmp.c: bug #26487: Added ip_output_if_opt that can add IP options
to the IP header (used by igmp_ip_output_if)
2009-05-06 Simon Goldschmidt
* inet_chksum.c: On little endian architectures, use LWIP_PLATFORM_HTONS (if
defined) for SWAP_BYTES_IN_WORD to speed up checksumming.

64
src/core/ipv4/igmp.c
View File

@ -667,7 +667,8 @@ igmp_stop_timer(struct igmp_group *group)
void
igmp_delaying_member( struct igmp_group *group, u8_t maxresp)
{
if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) || ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) && (maxresp > group->timer))) {
if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
((group->group_state == IGMP_GROUP_DELAYING_MEMBER) && (maxresp > group->timer))) {
igmp_start_timer(group, (maxresp)/2);
group->group_state = IGMP_GROUP_DELAYING_MEMBER;
}
@ -696,64 +697,11 @@ err_t
igmp_ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t proto, struct netif *netif)
{
static u16_t ip_id = 0;
struct ip_hdr * iphdr = NULL;
u16_t * ra = NULL;
/* First write in the "router alert" */
if (pbuf_header(p, ROUTER_ALERTLEN)) {
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: not enough room for IP header in pbuf\n"));
return ERR_BUF;
}
/* This is the "router alert" option */
ra = p->payload;
u16_t ra[2];
ra[0] = htons (ROUTER_ALERT);
ra[1] = 0x0000; /* Router shall examine packet */
/* now the normal ip header */
if (pbuf_header(p, IP_HLEN)) {
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: not enough room for IP header in pbuf\n"));
return ERR_BUF;
}
iphdr = p->payload;
/* Should the IP header be generated or is it already included in p? */
if (dest != IP_HDRINCL) {
/** @todo should be shared with ip.c - ip_output_if */
IPH_TTL_SET(iphdr, ttl);
IPH_PROTO_SET(iphdr, proto);
ip_addr_set(&(iphdr->dest), dest);
IPH_VHLTOS_SET(iphdr, 4, ((IP_HLEN + ROUTER_ALERTLEN) / 4), 0/*tos*/);
IPH_LEN_SET(iphdr, htons(p->tot_len));
IPH_OFFSET_SET(iphdr, 0);
IPH_ID_SET(iphdr, htons(ip_id));
++ip_id;
if (ip_addr_isany(src)) {
ip_addr_set(&(iphdr->src), &(netif->ip_addr));
} else {
ip_addr_set(&(iphdr->src), src);
}
IPH_CHKSUM_SET(iphdr, 0);
#if CHECKSUM_GEN_IP
IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, (IP_HLEN + ROUTER_ALERTLEN)));
#endif
} else {
dest = &(iphdr->dest);
}
#if IP_DEBUG
ip_debug_print(p);
#endif
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: sending to if %p\n", netif));
return netif->output(netif, p, dest);
return ip_output_if_opt(p, src, dest, ttl, 0, proto, netif, ra, ROUTER_ALERTLEN);
}
/**
@ -797,10 +745,10 @@ igmp_send(struct igmp_group *group, u8_t type)
igmp->igmp_checksum = 0;
igmp->igmp_checksum = inet_chksum( igmp, IGMP_MINLEN);
igmp_ip_output_if( p, &src, dest, IGMP_TTL, IP_PROTO_IGMP, group->interface);
igmp_ip_output_if(p, &src, dest, IGMP_TTL, IP_PROTO_IGMP, group->interface);
}
pbuf_free (p);
pbuf_free(p);
} else {
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
}

40
src/core/ipv4/ip.c
View File

@ -518,6 +518,21 @@ ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos,
u8_t proto, struct netif *netif)
{
#if IP_OPTIONS_SEND
return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
}
/**
* Same as ip_output_if() but with the possibility to include IP options:
*
* @ param ip_options pointer to the IP options, copied into the IP header
* @ param optlen length of ip_options
*/
err_t ip_output_if_opt(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
u16_t optlen)
{
#endif /* IP_OPTIONS_SEND */
struct ip_hdr *iphdr;
static u16_t ip_id = 0;
@ -525,6 +540,27 @@ ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
/* Should the IP header be generated or is it already included in p? */
if (dest != IP_HDRINCL) {
u16_t ip_hlen = IP_HLEN;
#if IP_OPTIONS_SEND
u16_t optlen_aligned = 0;
if (optlen != 0) {
/* round up to a multiple of 4 */
optlen_aligned = ((optlen + 3) & ~3);
ip_hlen += optlen_aligned;
/* First write in the IP options */
if (pbuf_header(p, optlen_aligned)) {
LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
IP_STATS_INC(ip.err);
snmp_inc_ipoutdiscards();
return ERR_BUF;
}
MEMCPY(p->payload, ip_options, optlen);
if (optlen < optlen_aligned) {
/* zero the remaining bytes */
memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
}
}
#endif /* IP_OPTIONS_SEND */
/* generate IP header */
if (pbuf_header(p, IP_HLEN)) {
LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output: not enough room for IP header in pbuf\n"));
@ -543,7 +579,7 @@ ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
ip_addr_set(&(iphdr->dest), dest);
IPH_VHLTOS_SET(iphdr, 4, IP_HLEN / 4, tos);
IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
IPH_LEN_SET(iphdr, htons(p->tot_len));
IPH_OFFSET_SET(iphdr, 0);
IPH_ID_SET(iphdr, htons(ip_id));
@ -557,7 +593,7 @@ ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
IPH_CHKSUM_SET(iphdr, 0);
#if CHECKSUM_GEN_IP
IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
#endif
} else {
/* IP header already included in p */

8
src/include/ipv4/lwip/ip.h
View File

@ -43,6 +43,9 @@
extern "C" {
#endif
/** Currently, the function ip_output_if_opt() is only used with IGMP */
#define IP_OPTIONS_SEND LWIP_IGMP
#define ip_init() /* Compatibility define, not init needed. */
struct netif *ip_route(struct ip_addr *dest);
err_t ip_input(struct pbuf *p, struct netif *inp);
@ -55,6 +58,11 @@ err_t ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
err_t ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint);
#endif /* LWIP_NETIF_HWADDRHINT */
#if IP_OPTIONS_SEND
err_t ip_output_if_opt(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
u16_t optlen);
#endif /* IP_OPTIONS_SEND */
struct netif *ip_current_netif();
const struct ip_hdr *ip_current_header();