[OpenWrt-Devel] [PATCH 3/3] netifd: GRE tunnel support
Florian Fainelli
florian at openwrt.org
Mon Aug 4 22:26:35 EDT 2014
On 07/30/14 04:56, Hans Dedecker wrote:
> Adds support for gre, gretap, grev6 and grev6tap tunnels
This commit breaks the build for earlier kernel versions which do not
have a bunch of IFLA_IPTUN_* missing constants, could you provide a
fallback definition for these earlier Linux kernels?
See
http://buildbot.openwrt.org:8010/builders/adm8668/builds/139/steps/compile_5/logs/stdio
for build failure details.
Thanks!
>
> Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
> ---
> system-dummy.c | 2 +-
> system-linux.c | 190 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
> system.c | 1 +
> system.h | 3 +-
> tunnel.c | 2 +-
> 5 files changed, 186 insertions(+), 12 deletions(-)
>
> diff --git a/system-dummy.c b/system-dummy.c
> index 8bcebc1..8e420e1 100644
> --- a/system-dummy.c
> +++ b/system-dummy.c
> @@ -235,7 +235,7 @@ time_t system_get_rtime(void)
> return 0;
> }
>
> -int system_del_ip_tunnel(const char *name)
> +int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
> {
> return 0;
> }
> diff --git a/system-linux.c b/system-linux.c
> index ea3a138..2d65cef 100644
> --- a/system-linux.c
> +++ b/system-linux.c
> @@ -806,7 +806,7 @@ nla_put_failure:
> return -ENOMEM;
> }
>
> -static int system_link_del(struct device *dev)
> +static int system_link_del(const char *ifname)
> {
> struct nl_msg *msg;
> struct ifinfomsg iim = {
> @@ -820,13 +820,13 @@ static int system_link_del(struct device *dev)
> return -1;
>
> nlmsg_append(msg, &iim, sizeof(iim), 0);
> - nla_put_string(msg, IFLA_IFNAME, dev->ifname);
> + nla_put_string(msg, IFLA_IFNAME, ifname);
> return system_rtnl_call(msg);
> }
>
> int system_macvlan_del(struct device *macvlan)
> {
> - return system_link_del(macvlan);
> + return system_link_del(macvlan->ifname);
> }
>
> static int system_vlan(struct device *dev, int id)
> @@ -912,7 +912,7 @@ nla_put_failure:
>
> int system_vlandev_del(struct device *vlandev)
> {
> - return system_link_del(vlandev);
> + return system_link_del(vlandev->ifname);
> }
>
> static void
> @@ -1654,9 +1654,173 @@ static int tunnel_ioctl(const char *name, int cmd, void *p)
> return ioctl(sock_ioctl, cmd, &ifr);
> }
>
> -int system_del_ip_tunnel(const char *name)
> +static int system_add_gre_tunnel(const char *name, const char *kind,
> + const unsigned int link, struct blob_attr **tb, bool v6)
> {
> - return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
> + struct nl_msg *nlm;
> + struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
> + struct blob_attr *cur;
> + uint32_t ikey = 0, okey = 0;
> + uint16_t iflags = 0, oflags = 0;
> + int ret = 0, ttl = 64;
> +
> + nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
> + if (!nlm)
> + return -1;
> +
> + nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
> + nla_put_string(nlm, IFLA_IFNAME, name);
> +
> + struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
> + if (!linkinfo) {
> + ret = -ENOMEM;
> + goto failure;
> + }
> +
> + nla_put_string(nlm, IFLA_INFO_KIND, kind);
> + struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
> + if (!infodata) {
> + ret = -ENOMEM;
> + goto failure;
> + }
> +
> + if (link)
> + nla_put_u32(nlm, IFLA_GRE_LINK, link);
> +
> + if ((cur = tb[TUNNEL_ATTR_TTL]))
> + ttl = blobmsg_get_u32(cur);
> +
> + nla_put_u8(nlm, IFLA_GRE_TTL, ttl);
> +
> + if ((cur = tb[TUNNEL_ATTR_INFO]) && (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)) {
> + uint8_t icsum, ocsum, iseqno, oseqno;
> + if (sscanf(blobmsg_get_string(cur), "%u,%u,%hhu,%hhu,%hhu,%hhu",
> + &ikey, &okey, &icsum, &ocsum, &iseqno, &oseqno) < 6) {
> + ret = -EINVAL;
> + goto failure;
> + }
> +
> + if (ikey)
> + iflags |= GRE_KEY;
> +
> + if (okey)
> + oflags |= GRE_KEY;
> +
> + if (icsum)
> + iflags |= GRE_CSUM;
> +
> + if (ocsum)
> + oflags |= GRE_CSUM;
> +
> + if (iseqno)
> + iflags |= GRE_SEQ;
> +
> + if (oseqno)
> + oflags |= GRE_SEQ;
> + }
> +
> + if (v6) {
> + struct in6_addr in6buf;
> + if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
> + if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
> + ret = -EINVAL;
> + goto failure;
> + }
> + nla_put(nlm, IFLA_GRE_LOCAL, sizeof(in6buf), &in6buf);
> + }
> +
> + if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
> + if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
> + ret = -EINVAL;
> + goto failure;
> + }
> + nla_put(nlm, IFLA_GRE_REMOTE, sizeof(in6buf), &in6buf);
> + }
> + nla_put_u8(nlm, IFLA_GRE_ENCAP_LIMIT, 4);
> + } else {
> + struct in_addr inbuf;
> + bool set_df = true;
> +
> + if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
> + if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
> + ret = -EINVAL;
> + goto failure;
> + }
> + nla_put(nlm, IFLA_GRE_LOCAL, sizeof(inbuf), &inbuf);
> + }
> +
> + if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
> + if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
> + ret = -EINVAL;
> + goto failure;
> + }
> + nla_put(nlm, IFLA_GRE_REMOTE, sizeof(inbuf), &inbuf);
> +
> + if (IN_MULTICAST(ntohl(inbuf.s_addr))) {
> + if (!okey) {
> + okey = inbuf.s_addr;
> + oflags |= GRE_KEY;
> + }
> +
> + if (!ikey) {
> + ikey = inbuf.s_addr;
> + iflags |= GRE_KEY;
> + }
> + }
> + }
> +
> + if ((cur = tb[TUNNEL_ATTR_DF]))
> + set_df = blobmsg_get_bool(cur);
> +
> + nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
> + }
> +
> + if (oflags)
> + nla_put_u16(nlm, IFLA_GRE_OFLAGS, oflags);
> +
> + if (iflags)
> + nla_put_u16(nlm, IFLA_GRE_IFLAGS, iflags);
> +
> + if (okey)
> + nla_put_u32(nlm, IFLA_GRE_OKEY, okey);
> +
> + if (ikey)
> + nla_put_u32(nlm, IFLA_GRE_IKEY, ikey);
> +
> + nla_nest_end(nlm, infodata);
> + nla_nest_end(nlm, linkinfo);
> +
> + return system_rtnl_call(nlm);
> +
> +failure:
> + nlmsg_free(nlm);
> + return ret;
> +}
> +
> +static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
> +{
> + struct blob_attr *cur;
> + const char *str;
> +
> + if (!(cur = tb[TUNNEL_ATTR_TYPE]))
> + return -EINVAL;
> + str = blobmsg_data(cur);
> +
> + if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
> + !strcmp(str, "greip6") || !strcmp(str, "gretapip6"))
> + return system_link_del(name);
> + else
> + return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
> +}
> +
> +int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
> +{
> + struct blob_attr *tb[__TUNNEL_ATTR_MAX];
> +
> + blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
> + blob_data(attr), blob_len(attr));
> +
> + return __system_del_ip_tunnel(name, tb);
> }
>
> int system_update_ipv6_mtu(struct device *dev, int mtu)
> @@ -1693,11 +1857,11 @@ int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
> bool set_df = true;
> const char *str;
>
> - system_del_ip_tunnel(name);
> -
> blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
> blob_data(attr), blob_len(attr));
>
> + __system_del_ip_tunnel(name, tb);
> +
> if (!(cur = tb[TUNNEL_ATTR_TYPE]))
> return -EINVAL;
> str = blobmsg_data(cur);
> @@ -1766,7 +1930,7 @@ int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
> }
>
> if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
> - system_del_ip_tunnel(name);
> + __system_del_ip_tunnel(name, tb);
> return -1;
> }
> }
> @@ -1873,6 +2037,14 @@ int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
> failure:
> nlmsg_free(nlm);
> return ret;
> + } else if (!strcmp(str, "greip")) {
> + return system_add_gre_tunnel(name, "gre", link, tb, false);
> + } else if (!strcmp(str, "gretapip")) {
> + return system_add_gre_tunnel(name, "gretap", link, tb, false);
> + } else if (!strcmp(str, "greip6")) {
> + return system_add_gre_tunnel(name, "ip6gre", link, tb, true);
> + } else if (!strcmp(str, "gretapip6")) {
> + return system_add_gre_tunnel(name, "ip6gretap", link, tb, true);
> }
> else
> return -EINVAL;
> diff --git a/system.c b/system.c
> index 8e1fc31..d070fea 100644
> --- a/system.c
> +++ b/system.c
> @@ -26,6 +26,7 @@ static const struct blobmsg_policy tunnel_attrs[__TUNNEL_ATTR_MAX] = {
> [TUNNEL_ATTR_6RD_RELAY_PREFIX] = { .name = "6rd-relay-prefix", .type = BLOBMSG_TYPE_STRING },
> [TUNNEL_ATTR_LINK] = { .name = "link", .type = BLOBMSG_TYPE_STRING },
> [TUNNEL_ATTR_FMRS] = { .name = "fmrs", .type = BLOBMSG_TYPE_ARRAY },
> + [TUNNEL_ATTR_INFO] = { .name = "info", .type = BLOBMSG_TYPE_STRING },
> };
>
> const struct uci_blob_param_list tunnel_attr_list = {
> diff --git a/system.h b/system.h
> index 0fde7f1..e3187fb 100644
> --- a/system.h
> +++ b/system.h
> @@ -32,6 +32,7 @@ enum tunnel_param {
> TUNNEL_ATTR_6RD_RELAY_PREFIX,
> TUNNEL_ATTR_LINK,
> TUNNEL_ATTR_FMRS,
> + TUNNEL_ATTR_INFO,
> __TUNNEL_ATTR_MAX
> };
>
> @@ -132,7 +133,7 @@ bool system_resolve_rt_type(const char *type, unsigned int *id);
> bool system_resolve_rt_table(const char *name, unsigned int *id);
> bool system_is_default_rt_table(unsigned int id);
>
> -int system_del_ip_tunnel(const char *name);
> +int system_del_ip_tunnel(const char *name, struct blob_attr *attr);
> int system_add_ip_tunnel(const char *name, struct blob_attr *attr);
>
> int system_add_iprule(struct iprule *rule);
> diff --git a/tunnel.c b/tunnel.c
> index aa60019..cdb83f0 100644
> --- a/tunnel.c
> +++ b/tunnel.c
> @@ -35,7 +35,7 @@ tunnel_set_state(struct device *dev, bool up)
>
> ret = tun->set_state(dev, up);
> if (ret || !up)
> - system_del_ip_tunnel(dev->ifname);
> + system_del_ip_tunnel(dev->ifname, dev->config);
>
> return ret;
> }
>
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