diff options
Diffstat (limited to 'ggsn/ggsn.c')
| -rw-r--r-- | ggsn/ggsn.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c index 9b11884..c307177 100644 --- a/ggsn/ggsn.c +++ b/ggsn/ggsn.c @@ -64,6 +64,7 @@ #include "../gtp/gtp.h" #include "cmdline.h" #include "gtp-kernel.h" +#include "icmpv6.h" int end = 0; int maxfd = 0; /* For select() */ @@ -206,11 +207,23 @@ int create_context_ind(struct pdp_t *pdp) return 0; /* Allready in use, or no more available */ } - in46a_to_eua(&member->addr, &pdp->eua); + if (addr.len == sizeof(struct in6_addr)) { + struct in46_addr tmp; + /* IPv6 doesn't really send the real/allocated address at this point, but just + * the link-identifier which the MS shall use for router solicitation */ + tmp.len = addr.len; + /* initialize upper 64 bits to prefix, they are discarded by MS anyway */ + memcpy(tmp.v6.s6_addr, &member->addr.v6, 8); + /* use allocated 64bit prefix as lower 64bit, used as link id by MS */ + memcpy(tmp.v6.s6_addr+8, &member->addr.v6, 8); + in46a_to_eua(&tmp, &pdp->eua); + } else + in46a_to_eua(&member->addr, &pdp->eua); pdp->peer = member; pdp->ipif = tun; /* TODO */ member->peer = pdp; + /* TODO: In IPv6, EUA doesn't contain the actual IP addr/prefix! */ if (gtp_kernel_tunnel_add(pdp) < 0) { SYS_ERR(DGGSN, LOGL_ERROR, 0, "Cannot add tunnel to kernel: %s\n", strerror(errno)); @@ -264,9 +277,30 @@ int cb_tun_ind(struct tun_t *tun, void *pack, unsigned len) return 0; } +/* RFC3307 link-local scope multicast address */ +static const struct in6_addr all_router_mcast_addr = { + .s6_addr = { 0xff,0x02,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,2 } +}; + int encaps_tun(struct pdp_t *pdp, void *pack, unsigned len) { + struct iphdr *iph = (struct iphdr *)pack; + struct ip6_hdr *ip6h = (struct ip6_hdr *)pack; + DEBUGP(DGGSN, "encaps_tun. Packet received: forwarding to tun\n"); + + switch (iph->version) { + case 6: + /* daddr: all-routers multicast addr */ + if (IN6_ARE_ADDR_EQUAL(&ip6h->ip6_dst, &all_router_mcast_addr)) + return handle_router_mcast(gsn, pdp, pack, len); + break; + case 4: + break; + default: + LOGP(DGGSN, LOGL_ERROR, "Packet from MS is neither IPv4 nor IPv6\n"); + return -1; + } return tun_encaps((struct tun_t *)pdp->ipif, pack, len); } |