From 6618e334ba6bb0a5638ac30cc4662103e7ec9f1e Mon Sep 17 00:00:00 2001 From: Chris Elston Date: Tue, 1 May 2012 04:25:22 +0000 Subject: [PATCH] iproute2: allow IPv6 addresses for l2tp local and remote parameters Adds support for parsing IPv6 addresses to the parameters local and remote in the l2tp commands. Requires netlink attributes L2TP_ATTR_IP6_SADDR and L2TP_ATTR_IP6_DADDR, added in a required kernel patch already submitted to netdev. Also enables printing of IPv6 addresses returned by the L2TP_CMD_TUNNEL_GET request. Signed-off-by: Chris Elston Signed-off-by: James Chapman --- ip/ipl2tp.c | 59 ++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 45 insertions(+), 14 deletions(-) diff --git a/ip/ipl2tp.c b/ip/ipl2tp.c index 3a5f94b..1cbed8d 100644 --- a/ip/ipl2tp.c +++ b/ip/ipl2tp.c @@ -50,8 +50,8 @@ struct l2tp_parm { uint8_t cookie[8]; int peer_cookie_len; uint8_t peer_cookie[8]; - struct in_addr local_ip; - struct in_addr peer_ip; + inet_prefix local_ip; + inet_prefix peer_ip; uint16_t pw_type; uint16_t mtu; @@ -97,6 +97,8 @@ static int create_tunnel(struct l2tp_parm *p) struct genlmsghdr g; char buf[1024]; } req; + uint32_t local_attr = L2TP_ATTR_IP_SADDR; + uint32_t peer_attr = L2TP_ATTR_IP_DADDR; memset(&req, 0, sizeof(req)); req.n.nlmsg_type = genl_family; @@ -110,8 +112,14 @@ static int create_tunnel(struct l2tp_parm *p) addattr8(&req.n, 1024, L2TP_ATTR_PROTO_VERSION, 3); addattr16(&req.n, 1024, L2TP_ATTR_ENCAP_TYPE, p->encap); - addattr32(&req.n, 1024, L2TP_ATTR_IP_SADDR, p->local_ip.s_addr); - addattr32(&req.n, 1024, L2TP_ATTR_IP_DADDR, p->peer_ip.s_addr); + if (p->local_ip.family == AF_INET6) + local_attr = L2TP_ATTR_IP6_SADDR; + addattr_l(&req.n, 1024, local_attr, &p->local_ip.data, p->local_ip.bytelen); + + if (p->peer_ip.family == AF_INET6) + peer_attr = L2TP_ATTR_IP6_DADDR; + addattr_l(&req.n, 1024, peer_attr, &p->peer_ip.data, p->peer_ip.bytelen); + if (p->encap == L2TP_ENCAPTYPE_UDP) { addattr16(&req.n, 1024, L2TP_ATTR_UDP_SPORT, p->local_udp_port); addattr16(&req.n, 1024, L2TP_ATTR_UDP_DPORT, p->peer_udp_port); @@ -225,13 +233,14 @@ static void print_cookie(char *name, const uint8_t *cookie, int len) static void print_tunnel(const struct l2tp_data *data) { const struct l2tp_parm *p = &data->config; + char buf[INET6_ADDRSTRLEN]; printf("Tunnel %u, encap %s\n", p->tunnel_id, p->encap == L2TP_ENCAPTYPE_UDP ? "UDP" : p->encap == L2TP_ENCAPTYPE_IP ? "IP" : "??"); - printf(" From %s ", inet_ntoa(p->local_ip)); - printf("to %s\n", inet_ntoa(p->peer_ip)); + printf(" From %s ", inet_ntop(p->local_ip.family, p->local_ip.data, buf, sizeof(buf))); + printf("to %s\n", inet_ntop(p->peer_ip.family, p->peer_ip.data, buf, sizeof(buf))); printf(" Peer tunnel %u\n", p->peer_tunnel_id); @@ -315,10 +324,30 @@ static int get_response(struct nlmsghdr *n, void *arg) if (attrs[L2TP_ATTR_RECV_TIMEOUT]) p->reorder_timeout = rta_getattr_u64(attrs[L2TP_ATTR_RECV_TIMEOUT]); - if (attrs[L2TP_ATTR_IP_SADDR]) - p->local_ip.s_addr = rta_getattr_u32(attrs[L2TP_ATTR_IP_SADDR]); - if (attrs[L2TP_ATTR_IP_DADDR]) - p->peer_ip.s_addr = rta_getattr_u32(attrs[L2TP_ATTR_IP_DADDR]); + if (attrs[L2TP_ATTR_IP_SADDR]) { + p->local_ip.family = AF_INET; + p->local_ip.data[0] = rta_getattr_u32(attrs[L2TP_ATTR_IP_SADDR]); + p->local_ip.bytelen = 4; + p->local_ip.bitlen = -1; + } + if (attrs[L2TP_ATTR_IP_DADDR]) { + p->peer_ip.family = AF_INET; + p->peer_ip.data[0] = rta_getattr_u32(attrs[L2TP_ATTR_IP_DADDR]); + p->peer_ip.bytelen = 4; + p->peer_ip.bitlen = -1; + } + if (attrs[L2TP_ATTR_IP6_SADDR]) { + p->local_ip.family = AF_INET6; + memcpy(&p->local_ip.data, RTA_DATA(attrs[L2TP_ATTR_IP6_SADDR]), + p->local_ip.bytelen = 16); + p->local_ip.bitlen = -1; + } + if (attrs[L2TP_ATTR_IP6_DADDR]) { + p->peer_ip.family = AF_INET6; + memcpy(&p->peer_ip.data, RTA_DATA(attrs[L2TP_ATTR_IP6_DADDR]), + p->peer_ip.bytelen = 16); + p->peer_ip.bitlen = -1; + } if (attrs[L2TP_ATTR_UDP_SPORT]) p->local_udp_port = rta_getattr_u16(attrs[L2TP_ATTR_UDP_SPORT]); if (attrs[L2TP_ATTR_UDP_DPORT]) @@ -529,10 +558,12 @@ static int parse_args(int argc, char **argv, int cmd, struct l2tp_parm *p) p->ifname = *argv; } else if (strcmp(*argv, "remote") == 0) { NEXT_ARG(); - p->peer_ip.s_addr = get_addr32(*argv); + if (get_addr(&p->peer_ip, *argv, AF_UNSPEC)) + invarg("invalid remote address\n", *argv); } else if (strcmp(*argv, "local") == 0) { NEXT_ARG(); - p->local_ip.s_addr = get_addr32(*argv); + if (get_addr(&p->local_ip, *argv, AF_UNSPEC)) + invarg("invalid local address\n", *argv); } else if ((strcmp(*argv, "tunnel_id") == 0) || (strcmp(*argv, "tid") == 0)) { __u32 uval; @@ -648,10 +679,10 @@ static int do_add(int argc, char **argv) missarg("peer_tunnel_id"); if (p.tunnel) { - if (p.local_ip.s_addr == 0) + if (p.local_ip.family == AF_UNSPEC) missarg("local"); - if (p.peer_ip.s_addr == 0) + if (p.peer_ip.family == AF_UNSPEC) missarg("remote"); if (p.encap == L2TP_ENCAPTYPE_UDP) { -- 2.39.2