From 4d61e98172d5aa21fd4cf80399f2aeb9d9ef051b Mon Sep 17 00:00:00 2001 From: hyung-hwan Date: Sun, 21 Oct 2018 16:53:41 +0000 Subject: [PATCH] copied netlink.h and netlink.c from musl --- qse/include/qse/si/netlink.h | 51 +++++ qse/lib/si/netlink.c | 372 +++++++++++++++++++++++++++++++++++ 2 files changed, 423 insertions(+) create mode 100644 qse/include/qse/si/netlink.h create mode 100644 qse/lib/si/netlink.c diff --git a/qse/include/qse/si/netlink.h b/qse/include/qse/si/netlink.h new file mode 100644 index 00000000..5b3f355a --- /dev/null +++ b/qse/include/qse/si/netlink.h @@ -0,0 +1,51 @@ +#ifndef _QSE_SI_NETLINK_H_ +#define _QSE_SI_NETLINK_H_ + +#include +#include + +#if defined(__linux) + +struct qse_nlmsg_hdr_t +{ + qse_uint32_t nlmsg_len; + qse_uint16_t nlmsg_type; + qse_uint16_t nlmsg_flags; + qse_uint32_t nlmsg_seq; + qse_uint32_t nlmsg_pid; +}; +typedef struct qse_nlmsg_hdr_t qse_nlmsg_hdr_t; + + +typedef int (*qse_nlenum_cb_t) ( + qse_nlmsg_hdr_t* hdr, + void* ctx +); + +#if defined(__cplusplus) +extern "C" { +#endif + +QSE_EXPORT int qse_nlenum ( + int fd, + unsigned int seq, + int type, + int af, + qse_nlenum_cb_t cb, + void* ctx +); + +QSE_EXPORT int qse_nlenum_route ( + int link_af, + int addr_af, + qse_nlenum_cb_t cb, + void* ctx +); + +#if defined(__cplusplus) +} +#endif + +#endif /* __linux */ + +#endif diff --git a/qse/lib/si/netlink.c b/qse/lib/si/netlink.c new file mode 100644 index 00000000..559a11f2 --- /dev/null +++ b/qse/lib/si/netlink.c @@ -0,0 +1,372 @@ +/* copied from musl */ + +#include +#include "../cmn/mem.h" + +#include +#include +#include +#include + +/* linux/netlink.h */ + +#define NETLINK_ROUTE 0 + +#define NLM_F_REQUEST 1 +#define NLM_F_MULTI 2 +#define NLM_F_ACK 4 + +#define NLM_F_ROOT 0x100 +#define NLM_F_MATCH 0x200 +#define NLM_F_ATOMIC 0x400 +#define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) + +#define NLMSG_NOOP 0x1 +#define NLMSG_ERROR 0x2 +#define NLMSG_DONE 0x3 +#define NLMSG_OVERRUN 0x4 + +/* linux/rtnetlink.h */ + +#define RTM_NEWLINK 16 +#define RTM_GETLINK 18 +#define RTM_NEWADDR 20 +#define RTM_GETADDR 22 + +struct rtattr +{ + unsigned short rta_len; + unsigned short rta_type; +}; + +struct rtgenmsg +{ + unsigned char rtgen_family; +}; + +struct ifinfomsg +{ + unsigned char ifi_family; + unsigned char __ifi_pad; + unsigned short ifi_type; + int ifi_index; + unsigned ifi_flags; + unsigned ifi_change; +}; + +/* linux/if_link.h */ + +#define IFLA_ADDRESS 1 +#define IFLA_BROADCAST 2 +#define IFLA_IFNAME 3 +#define IFLA_STATS 7 + +/* linux/if_addr.h */ + +struct ifaddrmsg +{ + qse_uint8_t ifa_family; + qse_uint8_t ifa_prefixlen; + qse_uint8_t ifa_flags; + qse_uint8_t ifa_scope; + qse_uint32_t ifa_index; +}; + +#define IFA_ADDRESS 1 +#define IFA_LOCAL 2 +#define IFA_LABEL 3 +#define IFA_BROADCAST 4 + +/* musl */ + +#define NETLINK_ALIGN(len) (((len)+3) & ~3) +#define NLMSG_DATA(nlh) ((void*)((char*)(nlh)+QSE_SIZEOF(struct qse_nlmsg_hdr_t))) +#define NLMSG_DATALEN(nlh) ((nlh)->nlmsg_len-QSE_SIZEOF(struct qse_nlmsg_hdr_t)) +#define NLMSG_DATAEND(nlh) ((char*)(nlh)+(nlh)->nlmsg_len) +#define NLMSG_NEXT(nlh) (struct qse_nlmsg_hdr_t*)((char*)(nlh)+NETLINK_ALIGN((nlh)->nlmsg_len)) +#define NLMSG_OK(nlh,end) ((char*)(end)-(char*)(nlh) >= QSE_SIZEOF(struct qse_nlmsg_hdr_t)) + +#define RTA_DATA(rta) ((void*)((char*)(rta)+QSE_SIZEOF(struct rtattr))) +#define RTA_DATALEN(rta) ((rta)->rta_len-QSE_SIZEOF(struct rtattr)) +#define RTA_DATAEND(rta) ((char*)(rta)+(rta)->rta_len) +#define RTA_NEXT(rta) (struct rtattr*)((char*)(rta)+NETLINK_ALIGN((rta)->rta_len)) +#define RTA_OK(nlh,end) ((char*)(end)-(char*)(rta) >= QSE_SIZEOF(struct rtattr)) + +#define NLMSG_RTA(nlh,len) ((void*)((char*)(nlh)+QSE_SIZEOF(struct qse_nlmsg_hdr_t)+NETLINK_ALIGN(len))) +#define NLMSG_RTAOK(rta,nlh) RTA_OK(rta,NLMSG_DATAEND(nlh)) + +int qse_nlenum(int fd, unsigned int seq, int type, int af, qse_nlenum_cb_t cb, void *ctx) +{ + struct qse_nlmsg_hdr_t *h; + union + { + qse_uint8_t buf[8192]; + struct + { + struct qse_nlmsg_hdr_t nlh; + struct rtgenmsg g; + } req; + struct qse_nlmsg_hdr_t reply; + } u; + int r, ret; + + QSE_MEMSET(&u.req, 0, QSE_SIZEOF(u.req)); + u.req.nlh.nlmsg_len = QSE_SIZEOF(u.req); + u.req.nlh.nlmsg_type = type; + u.req.nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST; + u.req.nlh.nlmsg_seq = seq; + u.req.g.rtgen_family = af; + r = send(fd, &u.req, QSE_SIZEOF(u.req), 0); + if (r < 0) return r; + + while (1) + { + r = recv(fd, u.buf, QSE_SIZEOF(u.buf), MSG_DONTWAIT); + if (r <= 0) return -1; + + for (h = &u.reply; NLMSG_OK(h, (void*)&u.buf[r]); h = NLMSG_NEXT(h)) + { + if (h->nlmsg_type == NLMSG_DONE) return 0; + if (h->nlmsg_type == NLMSG_ERROR) return -1; + ret = cb(h, ctx); + if (ret) return ret; + } + } +} + +int qse_nlenum_route (int link_af, int addr_af, qse_nlenum_cb_t cb, void *ctx) +{ + int fd, r; + + fd = socket(PF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE); + if (fd <= -1) return -1; + + r = qse_nlenum(fd, 1, RTM_GETLINK, link_af, cb, ctx); + if (!r) r = qse_nlenum(fd, 2, RTM_GETADDR, addr_af, cb, ctx); + + QSE_CLOSE (fd); + return r; +} + +#if 0 +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include "netlink.h" + +#define IFADDRS_HASH_SIZE 64 + +/* getifaddrs() reports hardware addresses with PF_PACKET that implies + * struct sockaddr_ll. But e.g. Infiniband socket address length is + * longer than sockaddr_ll.ssl_addr[8] can hold. Use this hack struct + * to extend ssl_addr - callers should be able to still use it. */ +struct sockaddr_ll_hack +{ + unsigned short sll_family, sll_protocol; + int sll_ifindex; + unsigned short sll_hatype; + unsigned char sll_pkttype, sll_halen; + unsigned char sll_addr[24]; +}; + +union sockany +{ + struct sockaddr sa; + struct sockaddr_ll_hack ll; + struct sockaddr_in v4; + struct sockaddr_in6 v6; +}; + +struct ifaddrs_storage +{ + struct ifaddrs ifa; + struct ifaddrs_storage *hash_next; + union sockany addr, netmask, ifu; + unsigned int index; + char name[IFNAMSIZ+1]; +}; + +struct ifaddrs_ctx +{ + struct ifaddrs_storage *first; + struct ifaddrs_storage *last; + struct ifaddrs_storage *hash[IFADDRS_HASH_SIZE]; +}; + +void freeifaddrs(struct ifaddrs *ifp) +{ + struct ifaddrs *n; + while (ifp) { + n = ifp->ifa_next; + free(ifp); + ifp = n; + } +} + +static void copy_addr(struct sockaddr **r, int af, union sockany *sa, void *addr, size_t addrlen, int ifindex) +{ + qse_uint8_t *dst; + int len; + + switch (af) { + case AF_INET: + dst = (qse_uint8_t*) &sa->v4.sin_addr; + len = 4; + break; + case AF_INET6: + dst = (qse_uint8_t*) &sa->v6.sin6_addr; + len = 16; + if (IN6_IS_ADDR_LINKLOCAL(addr) || IN6_IS_ADDR_MC_LINKLOCAL(addr)) + sa->v6.sin6_scope_id = ifindex; + break; + default: + return; + } + if (addrlen < len) return; + sa->sa.sa_family = af; + QSE_MEMCPY(dst, addr, len); + *r = &sa->sa; +} + +static void gen_netmask(struct sockaddr **r, int af, union sockany *sa, int prefixlen) +{ + qse_uint8_t addr[16] = {0}; + int i; + + if (prefixlen > 8*sizeof(addr)) prefixlen = 8*sizeof(addr); + i = prefixlen / 8; + QSE_MEMSET(addr, 0xff, i); + if (i < sizeof(addr)) addr[i++] = 0xff << (8 - (prefixlen % 8)); + copy_addr(r, af, sa, addr, sizeof(addr), 0); +} + +static void copy_lladdr(struct sockaddr **r, union sockany *sa, void *addr, size_t addrlen, int ifindex, unsigned short hatype) +{ + if (addrlen > sizeof(sa->ll.sll_addr)) return; + sa->ll.sll_family = AF_PACKET; + sa->ll.sll_ifindex = ifindex; + sa->ll.sll_hatype = hatype; + sa->ll.sll_halen = addrlen; + QSE_MEMCPY(sa->ll.sll_addr, addr, addrlen); + *r = &sa->sa; +} + +static int netlink_msg_to_ifaddr(void *pctx, struct qse_nlmsg_hdr_t *h) +{ + struct ifaddrs_ctx *ctx = pctx; + struct ifaddrs_storage *ifs, *ifs0; + struct ifinfomsg *ifi = NLMSG_DATA(h); + struct ifaddrmsg *ifa = NLMSG_DATA(h); + struct rtattr *rta; + int stats_len = 0; + + if (h->nlmsg_type == RTM_NEWLINK) { + for (rta = NLMSG_RTA(h, sizeof(*ifi)); NLMSG_RTAOK(rta, h); rta = RTA_NEXT(rta)) { + if (rta->rta_type != IFLA_STATS) continue; + stats_len = RTA_DATALEN(rta); + break; + } + } else { + for (ifs0 = ctx->hash[ifa->ifa_index % IFADDRS_HASH_SIZE]; ifs0; ifs0 = ifs0->hash_next) + if (ifs0->index == ifa->ifa_index) + break; + if (!ifs0) return 0; + } + + ifs = calloc(1, sizeof(struct ifaddrs_storage) + stats_len); + if (ifs == 0) return -1; + + if (h->nlmsg_type == RTM_NEWLINK) { + ifs->index = ifi->ifi_index; + ifs->ifa.ifa_flags = ifi->ifi_flags; + + for (rta = NLMSG_RTA(h, sizeof(*ifi)); NLMSG_RTAOK(rta, h); rta = RTA_NEXT(rta)) { + switch (rta->rta_type) { + case IFLA_IFNAME: + if (RTA_DATALEN(rta) < sizeof(ifs->name)) { + QSE_MEMCPY(ifs->name, RTA_DATA(rta), RTA_DATALEN(rta)); + ifs->ifa.ifa_name = ifs->name; + } + break; + case IFLA_ADDRESS: + copy_lladdr(&ifs->ifa.ifa_addr, &ifs->addr, RTA_DATA(rta), RTA_DATALEN(rta), ifi->ifi_index, ifi->ifi_type); + break; + case IFLA_BROADCAST: + copy_lladdr(&ifs->ifa.ifa_broadaddr, &ifs->ifu, RTA_DATA(rta), RTA_DATALEN(rta), ifi->ifi_index, ifi->ifi_type); + break; + case IFLA_STATS: + ifs->ifa.ifa_data = (void*)(ifs+1); + QSE_MEMCPY(ifs->ifa.ifa_data, RTA_DATA(rta), RTA_DATALEN(rta)); + break; + } + } + if (ifs->ifa.ifa_name) { + unsigned int bucket = ifs->index % IFADDRS_HASH_SIZE; + ifs->hash_next = ctx->hash[bucket]; + ctx->hash[bucket] = ifs; + } + } else { + ifs->ifa.ifa_name = ifs0->ifa.ifa_name; + ifs->ifa.ifa_flags = ifs0->ifa.ifa_flags; + for (rta = NLMSG_RTA(h, sizeof(*ifa)); NLMSG_RTAOK(rta, h); rta = RTA_NEXT(rta)) { + switch (rta->rta_type) { + case IFA_ADDRESS: + /* If ifa_addr is already set we, received an IFA_LOCAL before + * so treat this as destination address */ + if (ifs->ifa.ifa_addr) + copy_addr(&ifs->ifa.ifa_dstaddr, ifa->ifa_family, &ifs->ifu, RTA_DATA(rta), RTA_DATALEN(rta), ifa->ifa_index); + else + copy_addr(&ifs->ifa.ifa_addr, ifa->ifa_family, &ifs->addr, RTA_DATA(rta), RTA_DATALEN(rta), ifa->ifa_index); + break; + case IFA_BROADCAST: + copy_addr(&ifs->ifa.ifa_broadaddr, ifa->ifa_family, &ifs->ifu, RTA_DATA(rta), RTA_DATALEN(rta), ifa->ifa_index); + break; + case IFA_LOCAL: + /* If ifa_addr is set and we get IFA_LOCAL, assume we have + * a point-to-point network. Move address to correct field. */ + if (ifs->ifa.ifa_addr) { + ifs->ifu = ifs->addr; + ifs->ifa.ifa_dstaddr = &ifs->ifu.sa; + QSE_MEMSET(&ifs->addr, 0, sizeof(ifs->addr)); + } + copy_addr(&ifs->ifa.ifa_addr, ifa->ifa_family, &ifs->addr, RTA_DATA(rta), RTA_DATALEN(rta), ifa->ifa_index); + break; + case IFA_LABEL: + if (RTA_DATALEN(rta) < sizeof(ifs->name)) { + QSE_MEMCPY(ifs->name, RTA_DATA(rta), RTA_DATALEN(rta)); + ifs->ifa.ifa_name = ifs->name; + } + break; + } + } + if (ifs->ifa.ifa_addr) + gen_netmask(&ifs->ifa.ifa_netmask, ifa->ifa_family, &ifs->netmask, ifa->ifa_prefixlen); + } + + if (ifs->ifa.ifa_name) { + if (!ctx->first) ctx->first = ifs; + if (ctx->last) ctx->last->ifa.ifa_next = &ifs->ifa; + ctx->last = ifs; + } else { + free(ifs); + } + return 0; +} + +int getifaddrs(struct ifaddrs **ifap) +{ + struct ifaddrs_ctx _ctx, *ctx = &_ctx; + int r; + QSE_MEMSET(ctx, 0, sizeof *ctx); + r = __rtnetlink_enumerate(AF_UNSPEC, AF_UNSPEC, netlink_msg_to_ifaddr, ctx); + if (r == 0) *ifap = &ctx->first->ifa; + else freeifaddrs(&ctx->first->ifa); + return r; +} +#endif