diff options
Diffstat (limited to 'netlink.c')
| -rw-r--r-- | netlink.c | 44 |
1 files changed, 28 insertions, 16 deletions
@@ -454,27 +454,28 @@ next: * @ifi: Interface index * @mac: MAC address to fill, if passed as zero, to set otherwise * @up: If set, bring up the link + * @mtu: If non-zero, set interface MTU */ -void nl_link(int ns, unsigned int ifi, void *mac, int up) +void nl_link(int ns, unsigned int ifi, void *mac, int up, int mtu) { - int change = !MAC_IS_ZERO(mac) || up; + int change = !MAC_IS_ZERO(mac) || up || mtu; struct { struct nlmsghdr nlh; struct ifinfomsg ifm; struct rtattr rta; - unsigned char mac[ETH_ALEN]; + union { + unsigned char mac[ETH_ALEN]; + unsigned int mtu; + }; } req = { - .nlh.nlmsg_type = change ? RTM_NEWLINK : RTM_GETLINK, - .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), - .nlh.nlmsg_flags = NLM_F_REQUEST | (change ? NLM_F_ACK : 0), - .nlh.nlmsg_seq = nl_seq++, - .ifm.ifi_family = AF_UNSPEC, - .ifm.ifi_index = ifi, - .ifm.ifi_flags = up ? IFF_UP : 0, - .ifm.ifi_change = up ? IFF_UP : 0, - - .rta.rta_type = IFLA_ADDRESS, - .rta.rta_len = RTA_LENGTH(ETH_ALEN), + .nlh.nlmsg_type = change ? RTM_NEWLINK : RTM_GETLINK, + .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), + .nlh.nlmsg_flags = NLM_F_REQUEST | (change ? NLM_F_ACK : 0), + .nlh.nlmsg_seq = nl_seq++, + .ifm.ifi_family = AF_UNSPEC, + .ifm.ifi_index = ifi, + .ifm.ifi_flags = up ? IFF_UP : 0, + .ifm.ifi_change = up ? IFF_UP : 0, }; struct ifinfomsg *ifm; struct nlmsghdr *nh; @@ -485,13 +486,24 @@ void nl_link(int ns, unsigned int ifi, void *mac, int up) if (!MAC_IS_ZERO(mac)) { req.nlh.nlmsg_len = sizeof(req); memcpy(req.mac, mac, ETH_ALEN); + req.rta.rta_type = IFLA_ADDRESS; + req.rta.rta_len = RTA_LENGTH(ETH_ALEN); + nl_req(ns, buf, &req, req.nlh.nlmsg_len); } - n = nl_req(ns, buf, &req, req.nlh.nlmsg_len); + if (mtu) { + req.nlh.nlmsg_len = sizeof(req); + req.mtu = mtu; + req.rta.rta_type = IFLA_MTU; + req.rta.rta_len = RTA_LENGTH(sizeof(unsigned int)); + nl_req(ns, buf, &req, req.nlh.nlmsg_len); + } - if (!MAC_IS_ZERO(mac) || up) + if (change) return; + n = nl_req(ns, buf, &req, req.nlh.nlmsg_len); + nh = (struct nlmsghdr *)buf; for ( ; NLMSG_OK(nh, n); nh = NLMSG_NEXT(nh, n)) { if (nh->nlmsg_type != RTM_NEWLINK) |