diff options
Diffstat (limited to 'ip/link_gre.c')
| -rw-r--r-- | ip/link_gre.c | 576 |
1 files changed, 576 insertions, 0 deletions
diff --git a/ip/link_gre.c b/ip/link_gre.c new file mode 100644 index 0000000..010b482 --- /dev/null +++ b/ip/link_gre.c @@ -0,0 +1,576 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * link_gre.c gre driver module + * + * Authors: Herbert Xu <herbert@gondor.apana.org.au> + */ + +#include <string.h> +#include <net/if.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <arpa/inet.h> + +#include <linux/ip.h> +#include <linux/if_tunnel.h> +#include "rt_names.h" +#include "utils.h" +#include "ip_common.h" +#include "tunnel.h" + +static bool gre_is_erspan(struct link_util *lu) +{ + return !strcmp(lu->id, "erspan"); +} + +static void gre_print_help(struct link_util *lu, int argc, char **argv, FILE *f) +{ + bool is_erspan = gre_is_erspan(lu); + + fprintf(f, + "Usage: ... %-9s [ remote ADDR ]\n" + " [ local ADDR ]\n" + " [ [no][i|o]seq ]\n" + " [ [i|o]key KEY | no[i|o]key ]\n" + " [ [no][i|o]csum ]\n" + " [ ttl TTL ]\n" + " [ tos TOS ]\n" + " [ [no]pmtudisc ]\n" + " [ [no]ignore-df ]\n" + " [ dev PHYS_DEV ]\n" + " [ fwmark MARK ]\n" + " [ external ]\n" + " [ noencap ]\n" + " [ encap { fou | gue | none } ]\n" + " [ encap-sport PORT ]\n" + " [ encap-dport PORT ]\n" + " [ [no]encap-csum ]\n" + " [ [no]encap-csum6 ]\n" + " [ [no]encap-remcsum ]\n", lu->id); + if (is_erspan) + fprintf(f, + " [ erspan_ver version ]\n" + " [ erspan IDX ]\n" + " [ erspan_dir { ingress | egress } ]\n" + " [ erspan_hwid hwid ]\n"); + fprintf(f, + "\n" + "Where: ADDR := { IP_ADDRESS | any }\n" + " TOS := { NUMBER | inherit }\n" + " TTL := { 1..255 | inherit }\n" + " KEY := { DOTTED_QUAD | NUMBER }\n" + " MARK := { 0x0..0xffffffff }\n"); +} + +static int gre_parse_opt(struct link_util *lu, int argc, char **argv, + struct nlmsghdr *n) +{ + struct ifinfomsg *ifi = NLMSG_DATA(n); + struct { + struct nlmsghdr n; + struct ifinfomsg i; + } req = { + .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)), + .n.nlmsg_flags = NLM_F_REQUEST, + .n.nlmsg_type = RTM_GETLINK, + .i.ifi_family = preferred_family, + .i.ifi_index = ifi->ifi_index, + }; + struct nlmsghdr *answer = NULL; + struct rtattr *tb[IFLA_MAX + 1]; + struct rtattr *linkinfo[IFLA_INFO_MAX+1]; + struct rtattr *greinfo[IFLA_GRE_MAX + 1]; + int len; + __u16 iflags = 0; + __u16 oflags = 0; + __be32 ikey = 0; + __be32 okey = 0; + inet_prefix saddr, daddr; + __u8 pmtudisc = 1; + __u8 ignore_df = 0; + __u8 tos = 0; + __u8 ttl = 0; + __u32 link = 0; + __u16 encaptype = 0; + __u16 encapflags = 0; + __u16 encapsport = 0; + __u16 encapdport = 0; + __u8 metadata = 0; + __u32 fwmark = 0; + bool is_erspan = gre_is_erspan(lu); + __u32 erspan_idx = 0; + __u8 erspan_ver = 1; + __u8 erspan_dir = 0; + __u16 erspan_hwid = 0; + + inet_prefix_reset(&saddr); + inet_prefix_reset(&daddr); + + if (!(n->nlmsg_flags & NLM_F_CREATE)) { + const struct rtattr *rta; + + if (rtnl_talk(&rth, &req.n, &answer) < 0) + goto get_failed; + + len = answer->nlmsg_len; + len -= NLMSG_LENGTH(sizeof(*ifi)); + if (len < 0) + goto get_failed; + + parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len); + + if (!tb[IFLA_LINKINFO]) + goto get_failed; + + parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]); + + if (!linkinfo[IFLA_INFO_DATA]) + goto get_failed; + + parse_rtattr_nested(greinfo, IFLA_GRE_MAX, + linkinfo[IFLA_INFO_DATA]); + + rta = greinfo[IFLA_GRE_LOCAL]; + if (rta && get_addr_rta(&saddr, rta, AF_INET)) + goto get_failed; + + rta = greinfo[IFLA_GRE_REMOTE]; + if (rta && get_addr_rta(&daddr, rta, AF_INET)) + goto get_failed; + + if (greinfo[IFLA_GRE_IKEY]) + ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]); + + if (greinfo[IFLA_GRE_OKEY]) + okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]); + + if (greinfo[IFLA_GRE_IFLAGS]) + iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]); + + if (greinfo[IFLA_GRE_OFLAGS]) + oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]); + + if (greinfo[IFLA_GRE_PMTUDISC]) + pmtudisc = rta_getattr_u8( + greinfo[IFLA_GRE_PMTUDISC]); + + if (greinfo[IFLA_GRE_IGNORE_DF]) + ignore_df = + !!rta_getattr_u8(greinfo[IFLA_GRE_IGNORE_DF]); + + if (greinfo[IFLA_GRE_TOS]) + tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]); + + if (greinfo[IFLA_GRE_TTL]) + ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]); + + if (greinfo[IFLA_GRE_LINK]) + link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]); + + if (greinfo[IFLA_GRE_ENCAP_TYPE]) + encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]); + + if (greinfo[IFLA_GRE_ENCAP_FLAGS]) + encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]); + + if (greinfo[IFLA_GRE_ENCAP_SPORT]) + encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]); + + if (greinfo[IFLA_GRE_ENCAP_DPORT]) + encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]); + + if (greinfo[IFLA_GRE_COLLECT_METADATA]) + metadata = 1; + + if (greinfo[IFLA_GRE_FWMARK]) + fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]); + + if (greinfo[IFLA_GRE_ERSPAN_INDEX]) + erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]); + + if (greinfo[IFLA_GRE_ERSPAN_VER]) + erspan_ver = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_VER]); + + if (greinfo[IFLA_GRE_ERSPAN_DIR]) + erspan_dir = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_DIR]); + + if (greinfo[IFLA_GRE_ERSPAN_HWID]) + erspan_hwid = rta_getattr_u16(greinfo[IFLA_GRE_ERSPAN_HWID]); + + free(answer); + } + + while (argc > 0) { + if (!matches(*argv, "key")) { + NEXT_ARG(); + iflags |= GRE_KEY; + oflags |= GRE_KEY; + ikey = okey = tnl_parse_key("key", *argv); + } else if (!matches(*argv, "nokey")) { + iflags &= ~GRE_KEY; + oflags &= ~GRE_KEY; + ikey = okey = 0; + } else if (!matches(*argv, "ikey")) { + NEXT_ARG(); + iflags |= GRE_KEY; + ikey = tnl_parse_key("ikey", *argv); + } else if (!matches(*argv, "noikey")) { + iflags &= ~GRE_KEY; + ikey = 0; + } else if (!matches(*argv, "okey")) { + NEXT_ARG(); + oflags |= GRE_KEY; + okey = tnl_parse_key("okey", *argv); + } else if (!matches(*argv, "nookey")) { + oflags &= ~GRE_KEY; + okey = 0; + } else if (!matches(*argv, "seq")) { + iflags |= GRE_SEQ; + oflags |= GRE_SEQ; + } else if (!matches(*argv, "noseq")) { + iflags &= ~GRE_SEQ; + oflags &= ~GRE_SEQ; + } else if (!matches(*argv, "iseq")) { + iflags |= GRE_SEQ; + } else if (!matches(*argv, "noiseq")) { + iflags &= ~GRE_SEQ; + } else if (!matches(*argv, "oseq")) { + oflags |= GRE_SEQ; + } else if (!matches(*argv, "nooseq")) { + oflags &= ~GRE_SEQ; + } else if (!matches(*argv, "csum")) { + iflags |= GRE_CSUM; + oflags |= GRE_CSUM; + } else if (!matches(*argv, "nocsum")) { + iflags &= ~GRE_CSUM; + oflags &= ~GRE_CSUM; + } else if (!matches(*argv, "icsum")) { + iflags |= GRE_CSUM; + } else if (!matches(*argv, "noicsum")) { + iflags &= ~GRE_CSUM; + } else if (!matches(*argv, "ocsum")) { + oflags |= GRE_CSUM; + } else if (!matches(*argv, "noocsum")) { + oflags &= ~GRE_CSUM; + } else if (!matches(*argv, "nopmtudisc")) { + pmtudisc = 0; + } else if (!matches(*argv, "pmtudisc")) { + pmtudisc = 1; + } else if (!matches(*argv, "remote")) { + NEXT_ARG(); + get_addr(&daddr, *argv, AF_INET); + } else if (!matches(*argv, "local")) { + NEXT_ARG(); + get_addr(&saddr, *argv, AF_INET); + } else if (!matches(*argv, "dev")) { + NEXT_ARG(); + link = ll_name_to_index(*argv); + if (!link) + exit(nodev(*argv)); + } else if (!matches(*argv, "ttl") || + !matches(*argv, "hoplimit") || + !matches(*argv, "hlim")) { + NEXT_ARG(); + if (strcmp(*argv, "inherit") != 0) { + if (get_u8(&ttl, *argv, 0)) + invarg("invalid TTL\n", *argv); + } else + ttl = 0; + } else if (!matches(*argv, "tos") || + !matches(*argv, "tclass") || + !matches(*argv, "dsfield")) { + __u32 uval; + + NEXT_ARG(); + if (strcmp(*argv, "inherit") != 0) { + if (rtnl_dsfield_a2n(&uval, *argv)) + invarg("bad TOS value", *argv); + tos = uval; + } else + tos = 1; + } else if (strcmp(*argv, "noencap") == 0) { + encaptype = TUNNEL_ENCAP_NONE; + } else if (strcmp(*argv, "encap") == 0) { + NEXT_ARG(); + if (strcmp(*argv, "fou") == 0) + encaptype = TUNNEL_ENCAP_FOU; + else if (strcmp(*argv, "gue") == 0) + encaptype = TUNNEL_ENCAP_GUE; + else if (strcmp(*argv, "none") == 0) + encaptype = TUNNEL_ENCAP_NONE; + else + invarg("Invalid encap type.", *argv); + } else if (strcmp(*argv, "encap-sport") == 0) { + NEXT_ARG(); + if (strcmp(*argv, "auto") == 0) + encapsport = 0; + else if (get_u16(&encapsport, *argv, 0)) + invarg("Invalid source port.", *argv); + } else if (strcmp(*argv, "encap-dport") == 0) { + NEXT_ARG(); + if (get_u16(&encapdport, *argv, 0)) + invarg("Invalid destination port.", *argv); + } else if (strcmp(*argv, "encap-csum") == 0) { + encapflags |= TUNNEL_ENCAP_FLAG_CSUM; + } else if (strcmp(*argv, "noencap-csum") == 0) { + encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM; + } else if (strcmp(*argv, "encap-udp6-csum") == 0) { + encapflags |= TUNNEL_ENCAP_FLAG_CSUM6; + } else if (strcmp(*argv, "noencap-udp6-csum") == 0) { + encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6; + } else if (strcmp(*argv, "encap-remcsum") == 0) { + encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM; + } else if (strcmp(*argv, "noencap-remcsum") == 0) { + encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM; + } else if (strcmp(*argv, "external") == 0) { + metadata = 1; + } else if (strcmp(*argv, "ignore-df") == 0) { + ignore_df = 1; + } else if (strcmp(*argv, "noignore-df") == 0) { + /* + *only the lsb is significant, use 2 for presence + */ + ignore_df = 2; + } else if (strcmp(*argv, "fwmark") == 0) { + NEXT_ARG(); + if (get_u32(&fwmark, *argv, 0)) + invarg("invalid fwmark\n", *argv); + } else if (is_erspan && strcmp(*argv, "erspan") == 0) { + NEXT_ARG(); + if (get_u32(&erspan_idx, *argv, 0)) + invarg("invalid erspan index\n", *argv); + if (erspan_idx & ~((1<<20) - 1) || erspan_idx == 0) + invarg("erspan index must be > 0 and <= 20-bit\n", *argv); + } else if (is_erspan && strcmp(*argv, "erspan_ver") == 0) { + NEXT_ARG(); + if (get_u8(&erspan_ver, *argv, 0)) + invarg("invalid erspan version\n", *argv); + if (erspan_ver > 2) + invarg("erspan version must be 0/1/2\n", *argv); + } else if (is_erspan && strcmp(*argv, "erspan_dir") == 0) { + NEXT_ARG(); + if (matches(*argv, "ingress") == 0) + erspan_dir = 0; + else if (matches(*argv, "egress") == 0) + erspan_dir = 1; + else + invarg("Invalid erspan direction.", *argv); + } else if (is_erspan && strcmp(*argv, "erspan_hwid") == 0) { + NEXT_ARG(); + if (get_u16(&erspan_hwid, *argv, 0)) + invarg("invalid erspan hwid\n", *argv); + } else { + gre_print_help(lu, argc, argv, stderr); + return -1; + } + argc--; argv++; + } + + if (is_addrtype_inet_multi(&daddr)) { + if (!ikey) { + ikey = daddr.data[0]; + iflags |= GRE_KEY; + } + if (!okey) { + okey = daddr.data[0]; + oflags |= GRE_KEY; + } + if (!is_addrtype_inet_not_unspec(&saddr)) { + fprintf(stderr, + "A broadcast tunnel requires a source address.\n"); + return -1; + } + } + + if (metadata) { + addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0); + return 0; + } + + addattr32(n, 1024, IFLA_GRE_IKEY, ikey); + addattr32(n, 1024, IFLA_GRE_OKEY, okey); + addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2); + addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2); + if (is_addrtype_inet_not_unspec(&saddr)) + addattr_l(n, 1024, IFLA_GRE_LOCAL, saddr.data, saddr.bytelen); + if (is_addrtype_inet_not_unspec(&daddr)) + addattr_l(n, 1024, IFLA_GRE_REMOTE, daddr.data, daddr.bytelen); + addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1); + if (ignore_df) + addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1); + addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1); + if (link) + addattr32(n, 1024, IFLA_GRE_LINK, link); + addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1); + addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark); + if (is_erspan) { + addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver); + if (erspan_ver == 1 && erspan_idx != 0) { + addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx); + } else if (erspan_ver == 2) { + addattr8(n, 1024, IFLA_GRE_ERSPAN_DIR, erspan_dir); + addattr16(n, 1024, IFLA_GRE_ERSPAN_HWID, erspan_hwid); + } + } + addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype); + addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags); + addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport)); + addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport)); + + return 0; + +get_failed: + fprintf(stderr, "Failed to get existing tunnel info.\n"); + free(answer); + return -1; +} + +static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) +{ + char s2[64]; + __u16 iflags = 0; + __u16 oflags = 0; + __u8 ttl = 0; + __u8 tos = 0; + + if (!tb) + return; + + if (tb[IFLA_GRE_COLLECT_METADATA]) { + print_bool(PRINT_ANY, "external", "external ", true); + } + + tnl_print_endpoint("remote", tb[IFLA_GRE_REMOTE], AF_INET); + tnl_print_endpoint("local", tb[IFLA_GRE_LOCAL], AF_INET); + + if (tb[IFLA_GRE_LINK]) { + __u32 link = rta_getattr_u32(tb[IFLA_GRE_LINK]); + + if (link) { + print_string(PRINT_ANY, "link", "dev %s ", + ll_index_to_name(link)); + } + } + + if (tb[IFLA_GRE_TTL]) + ttl = rta_getattr_u8(tb[IFLA_GRE_TTL]); + if (is_json_context() || ttl) + print_uint(PRINT_ANY, "ttl", "ttl %u ", ttl); + else + print_string(PRINT_FP, NULL, "ttl %s ", "inherit"); + + if (tb[IFLA_GRE_TOS]) + tos = rta_getattr_u8(tb[IFLA_GRE_TOS]); + if (tos) { + if (is_json_context() || tos != 1) + print_0xhex(PRINT_ANY, "tos", "tos %#llx ", tos); + else + print_string(PRINT_FP, NULL, "tos %s ", "inherit"); + } + + if (tb[IFLA_GRE_PMTUDISC]) { + if (!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC])) + print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false); + else + print_bool(PRINT_JSON, "pmtudisc", NULL, true); + } + + if (tb[IFLA_GRE_IGNORE_DF] && rta_getattr_u8(tb[IFLA_GRE_IGNORE_DF])) + print_bool(PRINT_ANY, "ignore_df", "ignore-df ", true); + + if (tb[IFLA_GRE_IFLAGS]) + iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]); + + if (tb[IFLA_GRE_OFLAGS]) + oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]); + + if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) { + inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2)); + print_string(PRINT_ANY, "ikey", "ikey %s ", s2); + } + + if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) { + inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2)); + print_string(PRINT_ANY, "okey", "okey %s ", s2); + } + + if (iflags & GRE_SEQ) + print_bool(PRINT_ANY, "iseq", "iseq ", true); + if (oflags & GRE_SEQ) + print_bool(PRINT_ANY, "oseq", "oseq ", true); + if (iflags & GRE_CSUM) + print_bool(PRINT_ANY, "icsum", "icsum ", true); + if (oflags & GRE_CSUM) + print_bool(PRINT_ANY, "ocsum", "ocsum ", true); + + if (tb[IFLA_GRE_FWMARK]) { + __u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]); + + if (fwmark) { + print_0xhex(PRINT_ANY, + "fwmark", "fwmark %#llx ", fwmark); + } + } + + if (tb[IFLA_GRE_ERSPAN_INDEX]) { + __u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]); + + print_uint(PRINT_ANY, + "erspan_index", "erspan_index %u ", erspan_idx); + } + + if (tb[IFLA_GRE_ERSPAN_VER]) { + __u8 erspan_ver = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_VER]); + + print_uint(PRINT_ANY, + "erspan_ver", "erspan_ver %u ", erspan_ver); + } + + if (tb[IFLA_GRE_ERSPAN_DIR]) { + __u8 erspan_dir = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_DIR]); + + if (erspan_dir == 0) + print_string(PRINT_ANY, "erspan_dir", + "erspan_dir %s ", "ingress"); + else + print_string(PRINT_ANY, "erspan_dir", + "erspan_dir %s ", "egress"); + } + + if (tb[IFLA_GRE_ERSPAN_HWID]) { + __u16 erspan_hwid = rta_getattr_u16(tb[IFLA_GRE_ERSPAN_HWID]); + + print_0xhex(PRINT_ANY, + "erspan_hwid", "erspan_hwid %#llx ", erspan_hwid); + } + + tnl_print_encap(tb, + IFLA_GRE_ENCAP_TYPE, + IFLA_GRE_ENCAP_FLAGS, + IFLA_GRE_ENCAP_SPORT, + IFLA_GRE_ENCAP_DPORT); +} + +struct link_util gre_link_util = { + .id = "gre", + .maxattr = IFLA_GRE_MAX, + .parse_opt = gre_parse_opt, + .print_opt = gre_print_opt, + .print_help = gre_print_help, +}; + +struct link_util gretap_link_util = { + .id = "gretap", + .maxattr = IFLA_GRE_MAX, + .parse_opt = gre_parse_opt, + .print_opt = gre_print_opt, + .print_help = gre_print_help, +}; + +struct link_util erspan_link_util = { + .id = "erspan", + .maxattr = IFLA_GRE_MAX, + .parse_opt = gre_parse_opt, + .print_opt = gre_print_opt, + .print_help = gre_print_help, +}; |