[Crash-utility] [PATCH] Enhance "net" command to display IPv6 address of network interface

Currently, the "net" command displays only the IPv4 address of a network interface, it doesn't support outputting IPv6 address yet. For example: Without the patch: crash> net NET_DEVICE NAME IP ADDRESS(ES) ffff8d01b1205000 lo 127.0.0.1 ffff8d0087e40000 eno1 192.168.122.2 With the patch: crash> net NET_DEVICE NAME IP ADDRESS(ES) INET6 ADDRESS ffff8d01b1205000 lo 127.0.0.1 ::1 ffff8d0087e40000 eno1 192.168.122.2 xxxx:xx:x:xxxx:xxxx:xxx:xxxx:xxxx, yyyy::yyyy:yyy:yyyy:yyyy Related kernel commit: 502a2ffd7376 ("ipv6: convert idev_list to list macros") Reported-by: Buland Kumar Singh <bsingh(a)redhat.com&gt; Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com&gt; --- defs.h | 6 +++ net.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++-- symbols.c | 12 ++++++ 3 files changed, 133 insertions(+), 4 deletions(-) diff --git a/defs.h b/defs.h index e76af3c78b69..1f2cf6e0ce01 100644 --- a/defs.h +++ b/defs.h @@ -2208,6 +2208,12 @@ struct offset_table { /* stash of commonly-used offsets */ long sock_common_skc_v6_daddr; long sock_common_skc_v6_rcv_saddr; long inactive_task_frame_bp; + long net_device_ip6_ptr; + long inet6_dev_addr_list; + long inet6_ifaddr_addr; + long inet6_ifaddr_if_list; + long inet6_ifaddr_if_next; + long in6_addr_in6_u; }; struct size_table { /* stash of commonly-used sizes */ diff --git a/net.c b/net.c index aa445ab7ee13..5da2042d83ad 100644 --- a/net.c +++ b/net.c @@ -41,6 +41,7 @@ struct net_table { long in_ifaddr_ifa_next; long in_ifaddr_ifa_address; int net_device_name_index; + long dev_ip6_ptr; } net_table = { 0 }; struct net_table *net = &net_table; @@ -71,6 +72,7 @@ static void print_neighbour_q(ulong, int); static void get_netdev_info(ulong, struct devinfo *); static void get_device_name(ulong, char *); static long get_device_address(ulong, char **, long); +static void get_device_ip6_address(ulong, char **, long); static void get_sock_info(ulong, char *); static void dump_arp(void); static void arp_state_to_flags(unsigned char); @@ -114,6 +116,13 @@ net_init(void) net->dev_ip_ptr = MEMBER_OFFSET_INIT(net_device_ip_ptr, "net_device", "ip_ptr"); MEMBER_OFFSET_INIT(net_device_dev_list, "net_device", "dev_list"); + net->dev_ip6_ptr = MEMBER_OFFSET_INIT(net_device_ip6_ptr, "net_device", "ip6_ptr"); + MEMBER_OFFSET_INIT(inet6_dev_addr_list, "inet6_dev", "addr_list"); + MEMBER_OFFSET_INIT(inet6_ifaddr_addr, "inet6_ifaddr", "addr"); + MEMBER_OFFSET_INIT(inet6_ifaddr_if_list, "inet6_ifaddr", "if_list"); + MEMBER_OFFSET_INIT(inet6_ifaddr_if_next, "inet6_ifaddr", "if_next"); + MEMBER_OFFSET_INIT(in6_addr_in6_u, "in6_addr", "in6_u"); + MEMBER_OFFSET_INIT(net_dev_base_head, "net", "dev_base_head"); ARRAY_LENGTH_INIT(net->net_device_name_index, net_device_name, "net_device.name", NULL, sizeof(char)); @@ -466,7 +475,7 @@ show_net_devices(ulong task) buf = GETBUF(buflen); flen = MAX(VADDR_PRLEN, strlen(net->netdevice)); - fprintf(fp, "%s NAME IP ADDRESS(ES)\n", + fprintf(fp, "%s NAME IP ADDRESS(ES) INET6 ADDRESS\n", mkstring(upper_case(net->netdevice, buf), flen, CENTER|LJUST, NULL)); @@ -478,6 +487,13 @@ show_net_devices(ulong task) fprintf(fp, "%-6s ", buf); buflen = get_device_address(next, &buf, buflen); + + if (strlen(buf) > 0) + fprintf(fp, "%-6s ", buf); + else + fprintf(fp, "\t\t"); + + get_device_ip6_address(next, &buf, buflen); fprintf(fp, "%s\n", buf); readmem(next+net->dev_next, KVADDR, &next, @@ -503,7 +519,7 @@ show_net_devices_v2(ulong task) buf = GETBUF(buflen); flen = MAX(VADDR_PRLEN, strlen(net->netdevice)); - fprintf(fp, "%s NAME IP ADDRESS(ES)\n", + fprintf(fp, "%s NAME IP ADDRESS(ES) INET6 ADDRESS\n", mkstring(upper_case(net->netdevice, buf), flen, CENTER|LJUST, NULL)); @@ -531,6 +547,13 @@ show_net_devices_v2(ulong task) fprintf(fp, "%-6s ", buf); buflen = get_device_address(ld->list_ptr[i], &buf, buflen); + + if (strlen(buf) > 0) + fprintf(fp, "%-6s ", buf); + else + fprintf(fp, "\t\t"); + + get_device_ip6_address(ld->list_ptr[i], &buf, buflen); fprintf(fp, "%s\n", buf); } @@ -556,7 +579,7 @@ show_net_devices_v3(ulong task) buf = GETBUF(buflen); flen = MAX(VADDR_PRLEN, strlen(net->netdevice)); - fprintf(fp, "%s NAME IP ADDRESS(ES)\n", + fprintf(fp, "%s NAME IP ADDRESS(ES) INET6 ADDRESS\n", mkstring(upper_case(net->netdevice, buf), flen, CENTER|LJUST, NULL)); @@ -593,7 +616,14 @@ show_net_devices_v3(ulong task) get_device_name(ld->list_ptr[i], buf); fprintf(fp, "%-6s ", buf); - buflen = get_device_address(ld->list_ptr[i], &buf, buflen); + get_device_address(ld->list_ptr[i], &buf, buflen); + + if (strlen(buf) > 0) + fprintf(fp, "%-6s ", buf); + else + fprintf(fp, "\t\t"); + + get_device_ip6_address(ld->list_ptr[i], &buf, buflen); fprintf(fp, "%s\n", buf); } @@ -925,6 +955,87 @@ get_device_address(ulong devaddr, char **bufp, long buflen) return buflen; } +static void +get_device_ip6_address(ulong devaddr, char **bufp, long buflen) +{ + ulong ip6_ptr = 0, i, cnt = 0, pos = 0, bufsize = buflen; + struct list_data list_data, *ld; + struct in6_addr ip6_addr; + char *buf; + char str[INET6_ADDRSTRLEN + 1] = {0}; + char buffer[INET6_ADDRSTRLEN + 4] = {0}; + uint len = 0; + + buf = *bufp; + BZERO(buf, buflen); + + readmem(devaddr + net->dev_ip6_ptr, KVADDR, + &ip6_ptr, sizeof(ulong), "ip6_ptr", FAULT_ON_ERROR); + + if (!ip6_ptr) + return; + + if (MEMBER_TYPE("inet6_dev", "addr_list") == TYPE_CODE_PTR) { + ulong addrp = 0; + /* + * 502a2ffd7376 ("ipv6: convert idev_list to list macros") + * v2.6.35-rc1~473^2~733 + */ + readmem(ip6_ptr + OFFSET(inet6_dev_addr_list), KVADDR, + &addrp, sizeof(void *), "addr_list", FAULT_ON_ERROR); + + while (addrp) { + readmem(addrp + OFFSET(in6_addr_in6_u), KVADDR, &ip6_addr, + sizeof(struct in6_addr), "in6_addr.in6_u", FAULT_ON_ERROR); + inet_ntop(AF_INET6, (void*)&ip6_addr, str, INET6_ADDRSTRLEN); + sprintf(buffer, "%s%s", pos ? ", " : "", str); + len = strlen(buffer); + + if (pos + len >= bufsize) { + RESIZEBUF(*bufp, bufsize, bufsize + buflen); + buf = *bufp; + BZERO(buf + bufsize, buflen); + bufsize += buflen; + } + BCOPY(buffer, &buf[pos], len); + pos += len; + readmem(addrp + OFFSET(inet6_ifaddr_if_next), KVADDR, &addrp, + sizeof(void *), "inet6_ifaddr.if_next", FAULT_ON_ERROR); + } + + return; + } + + ld = &list_data; + BZERO(ld, sizeof(struct list_data)); + ld->flags |= LIST_ALLOCATE; + ld->start = ip6_ptr + OFFSET(inet6_dev_addr_list); + cnt = do_list(ld); + + for (i = 1; i < cnt; i++) { + ulong addr; + + addr = ld->list_ptr[i] + OFFSET(inet6_ifaddr_addr); + addr -= OFFSET(inet6_ifaddr_if_list); + readmem(addr + OFFSET(in6_addr_in6_u), KVADDR, &ip6_addr, + sizeof(struct in6_addr), "in6_addr.in6_u", FAULT_ON_ERROR); + + inet_ntop(AF_INET6, (void*)&ip6_addr, str, INET6_ADDRSTRLEN); + sprintf(buffer, "%s%s", pos ? ", " : "", str); + len = strlen(buffer); + + if (pos + len >= bufsize) { + RESIZEBUF(*bufp, bufsize, bufsize + buflen); + buf = *bufp; + BZERO(buf + bufsize, buflen); + bufsize += buflen; + } + BCOPY(buffer, &buf[pos], len); + pos += len; + } + + FREEBUF(ld->list_ptr); +} /* * Get the family, type, local and destination address/port pairs. */ diff --git a/symbols.c b/symbols.c index a974fc9141a0..c8bdeb841cdc 100644 --- a/symbols.c +++ b/symbols.c @@ -9787,6 +9787,18 @@ dump_offset_table(char *spec, ulong makestruct) OFFSET(net_device_addr_len)); fprintf(fp, " net_device_ip_ptr: %ld\n", OFFSET(net_device_ip_ptr)); + fprintf(fp, " net_device_ip6_ptr: %ld\n", + OFFSET(net_device_ip6_ptr)); + fprintf(fp, " inet6_dev_addr_list: %ld\n", + OFFSET(inet6_dev_addr_list)); + fprintf(fp, " inet6_ifaddr_addr: %ld\n", + OFFSET(inet6_ifaddr_addr)); + fprintf(fp, " inet6_ifaddr_if_list: %ld\n", + OFFSET(inet6_ifaddr_if_list)); + fprintf(fp, " inet6_ifaddr_if_next: %ld\n", + OFFSET(inet6_ifaddr_if_next)); + fprintf(fp, " in6_addr_in6_u: %ld\n", + OFFSET(in6_addr_in6_u)); fprintf(fp, " net_device_dev_list: %ld\n", OFFSET(net_device_dev_list)); fprintf(fp, " net_dev_base_head: %ld\n", -- 2.37.1