diff options
Diffstat (limited to 'netlink.c')
| -rw-r--r-- | netlink.c | 141 |
1 files changed, 82 insertions, 59 deletions
@@ -486,83 +486,44 @@ next: } /** - * nl_link() - Get/set link attributes + * nl_link_get_mac() - Get link MAC address * @ns: Use netlink socket in namespace * @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 + * @mac: Fill with current MAC address */ -void nl_link(int ns, unsigned int ifi, void *mac, int up, int mtu) +void nl_link_get_mac(int ns, unsigned int ifi, void *mac) { - int change = !MAC_IS_ZERO(mac) || up || mtu; struct req_t { struct nlmsghdr nlh; struct ifinfomsg ifm; - struct rtattr rta; - union { - unsigned char mac[ETH_ALEN]; - struct { - unsigned int mtu; - } mtu; - } set; } 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_type = RTM_GETLINK, + .nlh.nlmsg_len = sizeof(req), + .nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK, .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; - struct rtattr *rta; char buf[NLBUFSIZ]; ssize_t n; - size_t na; - - if (!MAC_IS_ZERO(mac)) { - req.nlh.nlmsg_len = sizeof(req); - memcpy(req.set.mac, mac, ETH_ALEN); - req.rta.rta_type = IFLA_ADDRESS; - req.rta.rta_len = RTA_LENGTH(ETH_ALEN); - if (nl_req(ns, buf, &req, req.nlh.nlmsg_len) < 0) - return; - up = 0; - } - - if (mtu) { - req.nlh.nlmsg_len = offsetof(struct req_t, set.mtu) - + sizeof(req.set.mtu); - req.set.mtu.mtu = mtu; - req.rta.rta_type = IFLA_MTU; - req.rta.rta_len = RTA_LENGTH(sizeof(unsigned int)); - if (nl_req(ns, buf, &req, req.nlh.nlmsg_len) < 0) - return; - - up = 0; - } - - if (up && nl_req(ns, buf, &req, req.nlh.nlmsg_len) < 0) - return; - - if (change) + n = nl_req(ns, buf, &req, sizeof(req)); + if (n < 0) return; - if ((n = nl_req(ns, buf, &req, req.nlh.nlmsg_len)) < 0) - return; + for (nh = (struct nlmsghdr *)buf; + NLMSG_OK(nh, n) && nh->nlmsg_type != NLMSG_DONE; + nh = NLMSG_NEXT(nh, n)) { + struct ifinfomsg *ifm = (struct ifinfomsg *)NLMSG_DATA(nh); + struct rtattr *rta; + size_t na; - nh = (struct nlmsghdr *)buf; - for ( ; NLMSG_OK(nh, n); nh = NLMSG_NEXT(nh, n)) { if (nh->nlmsg_type != RTM_NEWLINK) - goto next; - - ifm = (struct ifinfomsg *)NLMSG_DATA(nh); + continue; - for (rta = IFLA_RTA(ifm), na = RTM_PAYLOAD(nh); RTA_OK(rta, na); + for (rta = IFLA_RTA(ifm), na = RTM_PAYLOAD(nh); + RTA_OK(rta, na); rta = RTA_NEXT(rta, na)) { if (rta->rta_type != IFLA_ADDRESS) continue; @@ -570,8 +531,70 @@ void nl_link(int ns, unsigned int ifi, void *mac, int up, int mtu) memcpy(mac, RTA_DATA(rta), ETH_ALEN); break; } -next: - if (nh->nlmsg_type == NLMSG_DONE) - break; } } + +/** + * nl_link_set_mac() - Set link MAC address + * @ns: Use netlink socket in namespace + * @ifi: Interface index + * @mac: MAC address to set + */ +void nl_link_set_mac(int ns, unsigned int ifi, void *mac) +{ + struct req_t { + struct nlmsghdr nlh; + struct ifinfomsg ifm; + struct rtattr rta; + unsigned char mac[ETH_ALEN]; + } req = { + .nlh.nlmsg_type = RTM_NEWLINK, + .nlh.nlmsg_len = sizeof(req), + .nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK, + .nlh.nlmsg_seq = nl_seq++, + .ifm.ifi_family = AF_UNSPEC, + .ifm.ifi_index = ifi, + .rta.rta_type = IFLA_ADDRESS, + .rta.rta_len = RTA_LENGTH(ETH_ALEN), + }; + char buf[NLBUFSIZ]; + + memcpy(req.mac, mac, ETH_ALEN); + + nl_req(ns, buf, &req, sizeof(req)); +} + +/** + * nl_link_up() - Bring link up + * @ns: Use netlink socket in namespace + * @ifi: Interface index + * @mtu: If non-zero, set interface MTU + */ +void nl_link_up(int ns, unsigned int ifi, int mtu) +{ + struct req_t { + struct nlmsghdr nlh; + struct ifinfomsg ifm; + struct rtattr rta; + unsigned int mtu; + } req = { + .nlh.nlmsg_type = RTM_NEWLINK, + .nlh.nlmsg_len = sizeof(req), + .nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK, + .nlh.nlmsg_seq = nl_seq++, + .ifm.ifi_family = AF_UNSPEC, + .ifm.ifi_index = ifi, + .ifm.ifi_flags = IFF_UP, + .ifm.ifi_change = IFF_UP, + .rta.rta_type = IFLA_MTU, + .rta.rta_len = RTA_LENGTH(sizeof(unsigned int)), + .mtu = mtu, + }; + char buf[NLBUFSIZ]; + + if (!mtu) + /* Shorten request to drop MTU attribute */ + req.nlh.nlmsg_len = offsetof(struct req_t, rta); + + nl_req(ns, buf, &req, req.nlh.nlmsg_len); +} |