diff options
| -rw-r--r-- | netlink.c | 59 |
1 files changed, 47 insertions, 12 deletions
@@ -149,6 +149,47 @@ static ssize_t nl_req(int s, char *buf, void *req, } /** + * nl_do() - Send netlink "do" request, and wait for acknowledgement + * @s: Netlink socket + * @req: Request (will fill netlink header) + * @type: Request type + * @flags: Extra request flags (NLM_F_REQUEST and NLM_F_ACK assumed) + * @len: Request length + * + * Return: 0 on success, negative error code on error + */ +static int nl_do(int s, void *req, uint16_t type, uint16_t flags, ssize_t len) +{ + struct nlmsghdr *nh; + char buf[NLBUFSIZ]; + uint16_t seq; + ssize_t n; + + n = nl_req(s, buf, req, type, flags, len); + seq = ((struct nlmsghdr *)req)->nlmsg_seq; + + for (nh = (struct nlmsghdr *)buf; + NLMSG_OK(nh, n); nh = NLMSG_NEXT(nh, n)) { + struct nlmsgerr *errmsg; + + if (nh->nlmsg_seq != seq) + die("netlink: Unexpected response sequence number"); + + switch (nh->nlmsg_type) { + case NLMSG_DONE: + return 0; + case NLMSG_ERROR: + errmsg = (struct nlmsgerr *)NLMSG_DATA(nh); + return errmsg->error; + default: + warn("netlink: Unexpected response message"); + } + } + + die("netlink: Missing acknowledgement of request"); +} + +/** * nl_get_ext_if() - Get interface index supporting IP version being probed * @s: Netlink socket * @af: Address family (AF_INET or AF_INET6) to look for connectivity @@ -289,7 +330,6 @@ void nl_route_set_def(int s, unsigned int ifi, sa_family_t af, void *gw) .rta.rta_len = RTA_LENGTH(sizeof(unsigned int)), .ifi = ifi, }; - char buf[NLBUFSIZ]; ssize_t len; if (af == AF_INET6) { @@ -316,7 +356,7 @@ void nl_route_set_def(int s, unsigned int ifi, sa_family_t af, void *gw) req.set.r4.rta_gw.rta_len = rta_len; } - nl_req(s, buf, &req, RTM_NEWROUTE, NLM_F_CREATE | NLM_F_EXCL, len); + nl_do(s, &req, RTM_NEWROUTE, NLM_F_CREATE | NLM_F_EXCL, len); } /** @@ -385,12 +425,11 @@ void nl_route_dup(int s_src, unsigned int ifi_src, NLMSG_OK(nh, n) && nh->nlmsg_type != NLMSG_DONE; nh = NLMSG_NEXT(nh, n)) { uint16_t flags = nh->nlmsg_flags; - char resp[NLBUFSIZ]; if (nh->nlmsg_type != RTM_NEWROUTE) continue; - nl_req(s_dst, resp, nh, RTM_NEWROUTE, + nl_do(s_dst, nh, RTM_NEWROUTE, (flags & ~NLM_F_DUMP_FILTERED) | NLM_F_CREATE, nh->nlmsg_len); } @@ -489,7 +528,6 @@ void nl_addr_set(int s, unsigned int ifi, sa_family_t af, .ifa.ifa_prefixlen = prefix_len, .ifa.ifa_scope = RT_SCOPE_UNIVERSE, }; - char buf[NLBUFSIZ]; ssize_t len; if (af == AF_INET6) { @@ -518,7 +556,7 @@ void nl_addr_set(int s, unsigned int ifi, sa_family_t af, req.set.a4.rta_a.rta_type = IFA_ADDRESS; } - nl_req(s, buf, &req, RTM_NEWADDR, NLM_F_CREATE | NLM_F_EXCL, len); + nl_do(s, &req, RTM_NEWADDR, NLM_F_CREATE | NLM_F_EXCL, len); } /** @@ -550,7 +588,6 @@ void nl_addr_dup(int s_src, unsigned int ifi_src, NLMSG_OK(nh, n) && nh->nlmsg_type != NLMSG_DONE; nh = NLMSG_NEXT(nh, n)) { struct ifaddrmsg *ifa; - char resp[NLBUFSIZ]; struct rtattr *rta; size_t na; @@ -571,7 +608,7 @@ void nl_addr_dup(int s_src, unsigned int ifi_src, rta->rta_type = IFA_UNSPEC; } - nl_req(s_dst, resp, nh, RTM_NEWADDR, + nl_do(s_dst, nh, RTM_NEWADDR, (nh->nlmsg_flags & ~NLM_F_DUMP_FILTERED) | NLM_F_CREATE, nh->nlmsg_len); } @@ -639,11 +676,10 @@ void nl_link_set_mac(int s, unsigned int ifi, void *mac) .rta.rta_type = IFLA_ADDRESS, .rta.rta_len = RTA_LENGTH(ETH_ALEN), }; - char buf[NLBUFSIZ]; memcpy(req.mac, mac, ETH_ALEN); - nl_req(s, buf, &req, RTM_NEWLINK, 0, sizeof(req)); + nl_do(s, &req, RTM_NEWLINK, 0, sizeof(req)); } /** @@ -669,11 +705,10 @@ void nl_link_up(int s, unsigned int ifi, int mtu) .mtu = mtu, }; ssize_t len = sizeof(req); - char buf[NLBUFSIZ]; if (!mtu) /* Shorten request to drop MTU attribute */ len = offsetof(struct req_t, rta); - nl_req(s, buf, &req, RTM_NEWLINK, 0, len); + nl_do(s, &req, RTM_NEWLINK, 0, len); } |