From 3b8673edadc8ce6d1d90c12e6b8e57eeb291c521 Mon Sep 17 00:00:00 2001 From: Steven Barth Date: Mon, 13 May 2013 09:23:06 +0200 Subject: [PATCH] Add support for IP in IPv6 tunnels (DS-Lite) Signed-off-by: Steven Barth --- system-linux.c | 126 ++++++++++++++++++++++++++----------------------- system.c | 1 + system.h | 1 + 3 files changed, 68 insertions(+), 60 deletions(-) diff --git a/system-linux.c b/system-linux.c index 4401f78..efda0d5 100644 --- a/system-linux.c +++ b/system-linux.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include @@ -1278,14 +1279,6 @@ time_t system_get_rtime(void) #define IP_DF 0x4000 #endif -static void tunnel_parm_init(struct ip_tunnel_parm *p) -{ - memset(p, 0, sizeof(*p)); - p->iph.version = 4; - p->iph.ihl = 5; - p->iph.frag_off = htons(IP_DF); -} - static int tunnel_ioctl(const char *name, int cmd, void *p) { struct ifreq ifr; @@ -1298,10 +1291,7 @@ static int tunnel_ioctl(const char *name, int cmd, void *p) int system_del_ip_tunnel(const char *name) { - struct ip_tunnel_parm p; - - tunnel_parm_init(&p); - return tunnel_ioctl(name, SIOCDELTUNNEL, &p); + return tunnel_ioctl(name, SIOCDELTUNNEL, NULL); } int system_update_ipv6_mtu(struct device *dev, int mtu) @@ -1331,86 +1321,102 @@ out: return ret; } -static int parse_ipaddr(struct blob_attr *attr, __be32 *addr) -{ - if (!attr) - return 1; - - return inet_pton(AF_INET, blobmsg_data(attr), (void *) addr); -} - int system_add_ip_tunnel(const char *name, struct blob_attr *attr) { struct blob_attr *tb[__TUNNEL_ATTR_MAX]; struct blob_attr *cur; - struct ip_tunnel_parm p; - const char *base, *str; - bool is_sit; + const char *str; system_del_ip_tunnel(name); - tunnel_parm_init(&p); - blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb, blob_data(attr), blob_len(attr)); if (!(cur = tb[TUNNEL_ATTR_TYPE])) return -EINVAL; str = blobmsg_data(cur); - is_sit = !strcmp(str, "sit"); - if (is_sit) { - p.iph.protocol = IPPROTO_IPV6; - base = "sit0"; - } else + unsigned int ttl = 0; + if ((cur = tb[TUNNEL_ATTR_TTL]) && (ttl = blobmsg_get_u32(cur)) > 255) return -EINVAL; - if (!parse_ipaddr(tb[TUNNEL_ATTR_LOCAL], &p.iph.saddr)) + unsigned int link = 0; + if ((cur = tb[TUNNEL_ATTR_LINK]) && + !(link = if_nametoindex((const char*)blobmsg_data(cur)))) return -EINVAL; - if (!parse_ipaddr(tb[TUNNEL_ATTR_REMOTE], &p.iph.daddr)) - return -EINVAL; - if ((cur = tb[TUNNEL_ATTR_TTL])) { - unsigned int val = blobmsg_get_u32(cur); + if (!strcmp(str, "sit")) { + struct ip_tunnel_parm p = { + .link = link, + .iph = { + .version = 4, + .ihl = 5, + .frag_off = htons(IP_DF), + .protocol = IPPROTO_IPV6, + .ttl = ttl + } + }; - if (val > 255) + if ((cur = tb[TUNNEL_ATTR_LOCAL]) && + inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1) return -EINVAL; - p.iph.ttl = val; - } + if ((cur = tb[TUNNEL_ATTR_REMOTE]) && + inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1) + return -EINVAL; - strncpy(p.name, name, sizeof(p.name)); - if (tunnel_ioctl(base, SIOCADDTUNNEL, &p) < 0) - return -1; + strncpy(p.name, name, sizeof(p.name)); + if (tunnel_ioctl("sit0", SIOCADDTUNNEL, &p) < 0) + return -1; #ifdef SIOCADD6RD - cur = tb[TUNNEL_ATTR_6RD_PREFIX]; - if (cur && is_sit) { - unsigned int mask; - struct ip_tunnel_6rd p6; + if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) { + unsigned int mask; + struct ip_tunnel_6rd p6; - memset(&p6, 0, sizeof(p6)); + memset(&p6, 0, sizeof(p6)); - if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur), - &p6.prefix, &mask) || mask > 128) - return -EINVAL; - p6.prefixlen = mask; - - if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) { - if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur), - &p6.relay_prefix, &mask) || mask > 32) + if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur), + &p6.prefix, &mask) || mask > 128) return -EINVAL; - p6.relay_prefixlen = mask; - } + p6.prefixlen = mask; - if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) { - system_del_ip_tunnel(name); - return -1; + if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) { + if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur), + &p6.relay_prefix, &mask) || mask > 32) + return -EINVAL; + p6.relay_prefixlen = mask; + } + + if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) { + system_del_ip_tunnel(name); + return -1; + } } - } #endif + } else if (!strcmp(str, "ipip6")) { + struct ip6_tnl_parm p = { + .link = link, + .proto = IPPROTO_IPIP, + .hop_limit = (ttl) ? ttl : 64, + .encap_limit = 4, + }; + + if ((cur = tb[TUNNEL_ATTR_LOCAL]) && + inet_pton(AF_INET6, blobmsg_data(cur), &p.laddr) < 1) + return -EINVAL; + + if ((cur = tb[TUNNEL_ATTR_REMOTE]) && + inet_pton(AF_INET6, blobmsg_data(cur), &p.raddr) < 1) + return -EINVAL; + + strncpy(p.name, name, sizeof(p.name)); + if (tunnel_ioctl("ip6tnl0", SIOCADDTUNNEL, &p) < 0) + return -1; + } else + return -EINVAL; return 0; } diff --git a/system.c b/system.c index f71bcbe..76d8072 100644 --- a/system.c +++ b/system.c @@ -22,6 +22,7 @@ static const struct blobmsg_policy tunnel_attrs[__TUNNEL_ATTR_MAX] = { [TUNNEL_ATTR_TTL] = { "ttl", BLOBMSG_TYPE_INT32 }, [TUNNEL_ATTR_6RD_PREFIX] = { "6rd-prefix", BLOBMSG_TYPE_STRING }, [TUNNEL_ATTR_6RD_RELAY_PREFIX] = { "6rd-relay-prefix", BLOBMSG_TYPE_STRING }, + [TUNNEL_ATTR_LINK] = { "link", BLOBMSG_TYPE_STRING }, }; const struct config_param_list tunnel_attr_list = { diff --git a/system.h b/system.h index 691667c..d293157 100644 --- a/system.h +++ b/system.h @@ -28,6 +28,7 @@ enum tunnel_param { TUNNEL_ATTR_TTL, TUNNEL_ATTR_6RD_PREFIX, TUNNEL_ATTR_6RD_RELAY_PREFIX, + TUNNEL_ATTR_LINK, __TUNNEL_ATTR_MAX }; -- 2.25.1